The computational power of PHS
Publish: 2021-04-23 05:05:25
1. PHS (personal handy phone system, market name sometimes personal access system, personal phone access system) is a kind of wireless local telephone technology, which adopts micro cellular communication technology. PHS operates in the 1880-1930 MHz band< In fact, PHS technology belongs to the second generation of communication technology. The coverage of PHS base station is limited, and the distance between communication base station and terminal is short. Therefore, the communication power is small, and more base stations are needed to cover a larger area. This makes PHS more suitable for use in urban areas, but less effective in the field. In terms of the communication speed of mobile phones, PHS belongs to 2G. It's also designed to delay calls a little PHS uses TDMA / TDD as its radio communication interface and 32K ADPCM as its voice transmission code. Modern PHS phone can also support some other ISP value-added services, such as Internet narrowband communication, SMS, e-mail, and even picture messaging
PHS technology is also suitable for small-scale radio communication<
using
the initial release was in NTT laboratory in Japan in 1989, which appeared as a form of technology competing with GSM and PDC. In the early stage, it was developed by Japan according to its national conditions (the characteristics of large population density and small population mobility in most places). In 1995, it was initially operated by three telecom operators in Japan: NTT personal, DDI pocket and Astel. However, shortly after the launch of the service, the technology was called "poor people's cell" and was greatly restricted in Japan. Market share is also graally declining. Some countries that used to use PHS technology also began to use GSM, such as Chile. However, PHS technology is popular in some countries and regions with low fees and less additional business, such as Chinese mainland, Taiwan, Vietnam, Bangladesh, Nigeria, Mali, Tanzania and Honras. Br />
PHS's market
China Chinese mainland, China Telecom and China Netcom's PHS business use PHS technology in most places. In Taiwan, PHS technology is also used in low-power mobile phones of Volkswagen Telecom
References: http://ke..com/lemma-php/dispose/view.php/87833.htm
PHS technology is also suitable for small-scale radio communication<
using
the initial release was in NTT laboratory in Japan in 1989, which appeared as a form of technology competing with GSM and PDC. In the early stage, it was developed by Japan according to its national conditions (the characteristics of large population density and small population mobility in most places). In 1995, it was initially operated by three telecom operators in Japan: NTT personal, DDI pocket and Astel. However, shortly after the launch of the service, the technology was called "poor people's cell" and was greatly restricted in Japan. Market share is also graally declining. Some countries that used to use PHS technology also began to use GSM, such as Chile. However, PHS technology is popular in some countries and regions with low fees and less additional business, such as Chinese mainland, Taiwan, Vietnam, Bangladesh, Nigeria, Mali, Tanzania and Honras. Br />
PHS's market
China Chinese mainland, China Telecom and China Netcom's PHS business use PHS technology in most places. In Taiwan, PHS technology is also used in low-power mobile phones of Volkswagen Telecom
References: http://ke..com/lemma-php/dispose/view.php/87833.htm
2.
250 refers to the diameter of the inner circular hole of the square pile after centrifugation, which is 250mm
Other characters meaning: PHS is the code of the national standard high strength prestressed concrete centrifugal square pile, AB is the pile type, 450 is the outer length of the square pile 450mm, 250 is the inner circular hole diameter 250mm, 9.8 is the double section pile with the pile length of 9m and 8mhollow square pile is mainly composed of square pile body, end plate and steel hoop, which is more accepted by the market than pipe pile
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extended data
compared with other pile types, especially prestressed concrete pipe pile, the outstanding advantages of hollow square pile are as follows:
1, large surface area and square or multilateral angle type, and the repose angle between pile and soil in soil layer is much larger than that of circular pile, This means that the hollow square pile can obtain greater bearing capacity than the pipe pile under the same geological conditions, saving a lot of basic funds for the project
According to the comparison, the bearing capacity of 350 hollow square pile is equivalent to that of 500 outer diameter thick wall pipe pile, and the cost of bearing capacity per kn is lower than that of prestressed concrete pipe pile, which means that designers can optimize square pile under the same design bearing capacity, and the market price of 350 hollow square pile is less than that of 500 outer diameter thick wall pipe pile, which can save a lot of material cost According to the actual test of the Ministry of construction of Japan, the shear resistance of the square pile is 4.5 times of that of the pipe pile, which shows that the seismic performance of the hollow square pile is very superior, and it is worth popularizing in earthquake prone areas, high-rise buildings and large basement building foundationsreference materials
Network -- hollow square pile
Network -- prestressed concrete hollow square pile
3.
The calibration of phs-3c acidimeter can be divided into conventional method (one point calibration for rough measurement) and precision method (two or three points calibration for precision measurement). The user can choose one of them to calibrate according to the situation
1. Prepare three kinds of buffers: ph4.00, ph6.86, ph9.18
2. Press the mode key to make the instrument in pH measurement mode (at this time, the "pH" light on the display is on), and press the "∧" or "∨" key to adjust the temperature display to the temperature value of the standard buffer solution. If the automatic temperature compensation function is used, insert the temperature sensor plug into the "ATC" hole on the rear panel of the instrument. At this time, the "ATC" light on the display is on, and the "∧" and "∨" keys lose their function
3. Rinse the electrode (and temperature sensor probe) with distilled water and dry it with filter paper, then immerse it in a standard buffer with known pH value (the buffer should be selected with its pH value close to the pH value of the measured solution). Shake the beaker or stir the solution to make the bulb in front of the electrode contact with the standard buffer evenly
4. Press the cal key, the "cal" and "pH" lights on the display will flash, and the instrument will automatically identify the pH value of the standard buffer at this time; At the end of the measurement, the screen displays the standard pH value of the corresponding standard buffer, and the corresponding standard buffer indicator is on“ The "cal" light goes out and the "pH" stops flashing. This is the end of the calibration
5. On the basis of one point calibration, select the second standard buffer, and then operate according to the above calibration method of Zhengzhou Baojing electronic technology. At this time, the corresponding standard buffer indicator is on. The electrode performance indicator shows the performance of the electrode. At this point, the calibration is over
6. On the basis of two-point calibration, select the third standard buffer, and operate according to the above one point calibration method again. At this time, the indicator light of standard buffer is on. This is the end of the three-point calibration. The pH value of the solution can be measured by the instrument calibrated by Zhengzhou Baojing electronic technology. For the precision measurement method, it is better to keep the temperature of the measured solution consistent with that of the calibration solution
1. Rinse the electrode (and temperature sensor) with distilled water and dry it with filter paper
2. Immerse the electrode (and temperature sensor) in the solution to be measured. If manual temperature compensation is used, adjust the temperature to the temperature of the solution to be measured
3. Press yes and the "pH" light flashes, indicating that the measurement is in progress; Shake the beaker or stir the solution. When the "pH" light stops flashing, the pH value of the solution can be read
4. When the measurement is repeated, press the yes key again, the "pH" light will stop flashing, and then read the instrument indication. 1. Press the mode key to make the instrument in MV measurement state (the "pH" light on the display is off and the "MV" light is on). Connect the required ion selective electrode, wash the electrode with distilled water, dry it with filter paper, and immerse the electrode in the solution to be measured
2. Press the yes key, the "MV" indicator will flash, indicating that the measurement is in progress, shaking the beaker or stirring the solution. When the "MV" indicator stops flashing, the potential value of the ion selective electrode can be read out ± mV
3. To repeat the measurement, press yes until the "MV" indicator stops flashing, and then read the instrument indication. After the measurement, rinse the electrode and put it into the electrode protection solution. Turn off the power
4. 1. Before starting the machine,
A. screw the electrode stem into the electrode stem socket, and adjust the electrode clamp to the appropriate position
B. the composite electrode is clamped on the electrode clamp and the electrode sleeve at the front end of the electrode is pulled down
C. clean the electrode with distilled water and suck it up with filter paper after cleaning
2. Power on
A. plug the power cord into the power socket
B. press the power switch, turn on the power, warm up for 30min, and then calibrate
3. Calibration
the instrument should be calibrated before use. Generally speaking, the instrument should be calibrated once a day when it is in continuous use
A) remove the short circuit socket at the measuring electrode socket
b) insert the composite electrode at the measuring electrode socket
C) turn the selection switch knob to pH position
d) adjust the temperature compensation knob so that the white line of the knob is aligned with the solution temperature value
e) turn the slope adjustment knob clockwise to the end (i.e. to the 100% position)
F) insert the cleaned electrode into the buffer solution with pH = 6.86
G) adjust the positioning rotation to make the reading of the instrument consistent with the pH value of the buffer solution when the temperature of the buffer solution drops (for example, when the positioning temperature of mixed phosphoric acid is 100C, pH = 6.92)
H) insert the electrode cleaned with distilled water into the standard solution with pH = 4.00 (or pH = 9.18), and adjust the slope knob to make the reading of the instrument consistent with the pH value of the buffer solution at that time
I) repeat (f) - (H) until there is no need to adjust the positioning or slope knob
J) the instrument is calibrated< Measuring pH value
calibrated pH meter can be used to determine the solution to be measured, whether the temperature of the solution to be measured is the same as that of the calibration solution, and the measuring steps are different
(1) when the temperature of the solution to be measured is the same as that of the positioning solution, the measurement steps are as follows:
① wash the electrode head with distilled water and clean it once with the solution to be measured
② immerse the electrode in the solution to be measured, stir the solution with a glass rod to make the solution uniform, and read the pH value of the solution on the display screen
(2) when the temperature of the measured solution and the positioning solution is different, the measurement steps are as follows:
① clean the electrode head with the measured solution once
② measure the temperature value of the solution to be measured with a thermometer
③ adjust the "temperature" adjusting knob 8 so that the white line is aligned with the temperature value of the solution to be measured
④ insert the electrode into the solution to be measured, stir the solution with a glass rod to make the solution uniform, and then read out the pH value of the solution
to be more specific, you can find the user's manual and operation video of phs-3c on Taiyuan hengtianli website
I hope I can help you!
A. screw the electrode stem into the electrode stem socket, and adjust the electrode clamp to the appropriate position
B. the composite electrode is clamped on the electrode clamp and the electrode sleeve at the front end of the electrode is pulled down
C. clean the electrode with distilled water and suck it up with filter paper after cleaning
2. Power on
A. plug the power cord into the power socket
B. press the power switch, turn on the power, warm up for 30min, and then calibrate
3. Calibration
the instrument should be calibrated before use. Generally speaking, the instrument should be calibrated once a day when it is in continuous use
A) remove the short circuit socket at the measuring electrode socket
b) insert the composite electrode at the measuring electrode socket
C) turn the selection switch knob to pH position
d) adjust the temperature compensation knob so that the white line of the knob is aligned with the solution temperature value
e) turn the slope adjustment knob clockwise to the end (i.e. to the 100% position)
F) insert the cleaned electrode into the buffer solution with pH = 6.86
G) adjust the positioning rotation to make the reading of the instrument consistent with the pH value of the buffer solution when the temperature of the buffer solution drops (for example, when the positioning temperature of mixed phosphoric acid is 100C, pH = 6.92)
H) insert the electrode cleaned with distilled water into the standard solution with pH = 4.00 (or pH = 9.18), and adjust the slope knob to make the reading of the instrument consistent with the pH value of the buffer solution at that time
I) repeat (f) - (H) until there is no need to adjust the positioning or slope knob
J) the instrument is calibrated< Measuring pH value
calibrated pH meter can be used to determine the solution to be measured, whether the temperature of the solution to be measured is the same as that of the calibration solution, and the measuring steps are different
(1) when the temperature of the solution to be measured is the same as that of the positioning solution, the measurement steps are as follows:
① wash the electrode head with distilled water and clean it once with the solution to be measured
② immerse the electrode in the solution to be measured, stir the solution with a glass rod to make the solution uniform, and read the pH value of the solution on the display screen
(2) when the temperature of the measured solution and the positioning solution is different, the measurement steps are as follows:
① clean the electrode head with the measured solution once
② measure the temperature value of the solution to be measured with a thermometer
③ adjust the "temperature" adjusting knob 8 so that the white line is aligned with the temperature value of the solution to be measured
④ insert the electrode into the solution to be measured, stir the solution with a glass rod to make the solution uniform, and then read out the pH value of the solution
to be more specific, you can find the user's manual and operation video of phs-3c on Taiyuan hengtianli website
I hope I can help you!
5. Pas (personal access system) is a new type of personal wireless access system. It uses advanced micro cellular technology to achieve wireless coverage through the micro cellular base station, and connects the user end (i.e. wireless local phone) to the local telephone network in a wireless way, so that the traditional fixed telephone is no longer fixed in a certain position, and can be freely used in the wireless network coverage, and can answer and dial local, domestic and international calls anytime and anywhere
the voice is clear
because the system adopts 32kadpcm coding mode, the call quality is close to that of ordinary fixed telephone
the transmitting power level is low
"PHS" mobile phone has only 10MW transmitting power. It can be used for a long time without discomfort and any impact on human body. It is a real green mobile phone<
long standby time
"PHS" mobile phone uses lithium battery, standby time can reach 500-800 hours, continuous fairy tale time can reach 8 hours, in general, it can be used for 4-5 days without charging, and it does not need a second battery
multiple functions
after the wireless local telephone system is officially opened, it has the new functions of calling number display, call transfer, call waiting, three-party call, telephone recording, etc., which are convenient for users<
the price is reasonable, smart city people's new choice
the call fee of wireless local telephone is the same as that of fixed telephone, one-way charge
wireless local telephone & quot; PHS & quot; It is a kind of international advanced personal communication technology
the wireless local telephone is the crystallization of technological progress. The author innovatively applies the wireless access technology to the traditional fixed telephone transmission and switching network, and solves the mobile problem in personal communication by using the rich resources of the existing fixed network economically and effectively. The integration of PAS and IP technology can not only meet the requirements of users for the development of various communication services, but also create a road for the development and evolution of the existing network to the future communication network
wireless local telephone is an international advanced personal communication technology. It adopts advanced micro cellular technology, which can provide large traffic, high-density services, with dynamic channel allocation, and can accommodate more than 20000 users per square kilometer; Provide high quality transmission and voice quality, good security performance, safe and reliable. At the same time, the wireless local telephone service processing ability is strong. After the system is completed, it can not only provide all the functions of the fixed telephone (at present, it can provide caller ID and no answer transfer call function), but also provide a variety of value-added services, such as: high-speed data access, 110 alarm and 120 emergency system positioning function, multimedia service, short message service, C-mode service, etc
PHS is a new type of personal wireless access system. It uses advanced micro cellular technology to access the local telephone network in a wireless way, which is an effective supplement and extension of fixed telephone; PHS has good security performance, safe and reliable, and can be carried freely within the network coverage. It can make and receive local calls, mobile phones, domestic and international long-distance calls anytime and anywhere; PHS implements one-way charging, and its charging standard is basically the same as that of fixed telephone. It has many characteristics, such as economic benefits, green health, exquisite fashion and so on
PHS adopts all digital wireless technology, which has strong confidentiality and can not be stolen; Adopting 32K speech coding, it can support voice and data services with clear voice, which is comparable to that of wired telephone. In the future, it can also support high-speed data transmission services; The mobile phone is light, fashionable and powerful, which can support data communication; It uses the micro cellular technology to connect the user end (that is, the wireless local phone) to the local telephone network in a wireless way, so that the traditional fixed telephone is no longer fixed in a certain position, and can be freely used in the wireless network coverage, and can answer and dial local, domestic and international calls anytime and anywhere. The most important feature is that the telephone fee is economical and the use is flexible
the characteristics of PHS are as follows:
(1) mobile call: the number is 7 digits. Within the network coverage, users can answer calls anytime and anywhere, and make local calls, mobile phones, domestic and international calls
(2) cost effective: one way charging, free of charge for answering calls, and basically the same tariff standard as fixed line telephone. The first 3 minutes of local call is 0.20 yuan, and then 0.10 yuan per minute, the domestic long distance is 0.07 yuan per 6 seconds, the domestic IP phone is 0.30 yuan per minute, and the point-to-point SMS is 0.08 yuan per minute, so that users can enjoy the mobile phone service at the price of fixed line telephone
(3) green health: the transmitting power is only 10 MW, which does no harm to human body. It is known as the new generation of "green health mobile phone". Users can use it safely without worrying about electromagnetic radiation
(4) clear voice quality: 32kadpcm speech coding is adopted, which is the same as that of fixed telephone, and the call quality of PHS is comparable to that of fixed telephone within the network coverage
(5) complete functions: in addition to the basic call functions of the existing fixed line telephone, it can also provide a variety of functions and services, such as caller ID, SMS, call transfer, medium and high speed internet access, etc.
the voice is clear
because the system adopts 32kadpcm coding mode, the call quality is close to that of ordinary fixed telephone
the transmitting power level is low
"PHS" mobile phone has only 10MW transmitting power. It can be used for a long time without discomfort and any impact on human body. It is a real green mobile phone<
long standby time
"PHS" mobile phone uses lithium battery, standby time can reach 500-800 hours, continuous fairy tale time can reach 8 hours, in general, it can be used for 4-5 days without charging, and it does not need a second battery
multiple functions
after the wireless local telephone system is officially opened, it has the new functions of calling number display, call transfer, call waiting, three-party call, telephone recording, etc., which are convenient for users<
the price is reasonable, smart city people's new choice
the call fee of wireless local telephone is the same as that of fixed telephone, one-way charge
wireless local telephone & quot; PHS & quot; It is a kind of international advanced personal communication technology
the wireless local telephone is the crystallization of technological progress. The author innovatively applies the wireless access technology to the traditional fixed telephone transmission and switching network, and solves the mobile problem in personal communication by using the rich resources of the existing fixed network economically and effectively. The integration of PAS and IP technology can not only meet the requirements of users for the development of various communication services, but also create a road for the development and evolution of the existing network to the future communication network
wireless local telephone is an international advanced personal communication technology. It adopts advanced micro cellular technology, which can provide large traffic, high-density services, with dynamic channel allocation, and can accommodate more than 20000 users per square kilometer; Provide high quality transmission and voice quality, good security performance, safe and reliable. At the same time, the wireless local telephone service processing ability is strong. After the system is completed, it can not only provide all the functions of the fixed telephone (at present, it can provide caller ID and no answer transfer call function), but also provide a variety of value-added services, such as: high-speed data access, 110 alarm and 120 emergency system positioning function, multimedia service, short message service, C-mode service, etc
PHS is a new type of personal wireless access system. It uses advanced micro cellular technology to access the local telephone network in a wireless way, which is an effective supplement and extension of fixed telephone; PHS has good security performance, safe and reliable, and can be carried freely within the network coverage. It can make and receive local calls, mobile phones, domestic and international long-distance calls anytime and anywhere; PHS implements one-way charging, and its charging standard is basically the same as that of fixed telephone. It has many characteristics, such as economic benefits, green health, exquisite fashion and so on
PHS adopts all digital wireless technology, which has strong confidentiality and can not be stolen; Adopting 32K speech coding, it can support voice and data services with clear voice, which is comparable to that of wired telephone. In the future, it can also support high-speed data transmission services; The mobile phone is light, fashionable and powerful, which can support data communication; It uses the micro cellular technology to connect the user end (that is, the wireless local phone) to the local telephone network in a wireless way, so that the traditional fixed telephone is no longer fixed in a certain position, and can be freely used in the wireless network coverage, and can answer and dial local, domestic and international calls anytime and anywhere. The most important feature is that the telephone fee is economical and the use is flexible
the characteristics of PHS are as follows:
(1) mobile call: the number is 7 digits. Within the network coverage, users can answer calls anytime and anywhere, and make local calls, mobile phones, domestic and international calls
(2) cost effective: one way charging, free of charge for answering calls, and basically the same tariff standard as fixed line telephone. The first 3 minutes of local call is 0.20 yuan, and then 0.10 yuan per minute, the domestic long distance is 0.07 yuan per 6 seconds, the domestic IP phone is 0.30 yuan per minute, and the point-to-point SMS is 0.08 yuan per minute, so that users can enjoy the mobile phone service at the price of fixed line telephone
(3) green health: the transmitting power is only 10 MW, which does no harm to human body. It is known as the new generation of "green health mobile phone". Users can use it safely without worrying about electromagnetic radiation
(4) clear voice quality: 32kadpcm speech coding is adopted, which is the same as that of fixed telephone, and the call quality of PHS is comparable to that of fixed telephone within the network coverage
(5) complete functions: in addition to the basic call functions of the existing fixed line telephone, it can also provide a variety of functions and services, such as caller ID, SMS, call transfer, medium and high speed internet access, etc.
6. The phs-25 high precision acidimeter is well designed and easy to use, Technical parameters
range: pH 0.00 ~ 14.00ph
temperature - 9.9 ~ 99.9 ℃
16 ~ 210 ℃
resolution: pH 0.01ph
temperature: 0.1 ℃ 0.1 ℃ (16 ~ 99 ℃)
accuracy: pH ± 0.05ph
temperature: ± 1 ℃ ± 2 ° f
input impedance: 1012
calibration: 1-point or 2-point calibration
power supply: 9V power adapter
operating environment: 5 ~ 50 ℃ RH ≤ 95%, no magnetic interference around the instrument, no significant source
overall size: 208 × two hundred × 76mm long × wide × The instrument has three functional interfaces and two switches, each of which has unique pluggability to ensure that you will not connect wrong
[power] power socket [on / off] power switch
[Ph / ORP] pH composite electrode or ion electrode interface [temp] temperature sensor socket
[℃ / ℃] Fahrenheit and centigrade selection switch (this measurement mode should be selected before the instrument is powered on)
IV. operation
& ᦇ 8226; Connect the pH electrode, temperature sensor and power supply, select the temperature mode, and press the [on / off] switch to turn on the power supply< br />• Remove the protective cap of pH electrode and insert pH electrode and temperature sensor into the solution to be measured< br />• Gently shake the pH electrode a few times, do not let the bubble on the electrode ball have bubbles, otherwise the measurement accuracy will be affected. When the indication is stable, read the pH value and temperature value< br />• After the measurement, clean the electrode with clean water and put on the protective cap< 5. PH calibration; Pour an appropriate amount of ph6.86 and 4.01 (or 9.18) standard buffer solution into a clean beaker< br /> • For accurate calibration, two beakers were used for each buffer solution, one for rinsing electrode and the other for calibration. In this way, the degree of contamination of the buffer solution can be minimized< br />• Turn on the power switch, immerse the pH electrode and temperature electrode in the buffer solution with pH value of 6.86, and shake them gently< br />• When the indication is stable, use a small screwdriver to adjust the "STD" potentiometer on the left side of the panel until the displayed value is consistent with the pH value of the calibration buffer solution at the measured temperature< br />• Insert the electrode into ph4.01 (or 9.18) standard buffer solution and gently shake the electrode< br />• When the indication is stable, use a small screwdriver to adjust the "slope" potentiometer on the right side of the panel until the displayed value is consistent with the pH value of the calibration buffer solution at the measured temperature. In this way, the calibration of pH gear is completed
under the following circumstances, the instrument must be recalibrated< br />• The electrode has been replaced; After calibration, it should be used or placed for a long time
&8226; The electrode is used frequently; 6. Maintenance of pH electrode and instrument; The electrode interface of the instrument must be kept dry and clean< br />• After each measurement, the electrode should be cleaned and soaked in potassium chloride solution (3mol / L)< br />• The measuring electrode shall not be immersed in distilled water, protein solution or acidic fluoride solution for a long time
if the electrode is contaminated, clean it with detergent as described below
pollutant cleaning agent
inorganic metal compound less than 1mol / L dilute acid
organic grease material dilute washing solution (weak acid)
resin macromolecule material alcohol
protein blood cell sediment acidic enzyme solution
pigment material dilute bleaching solution
VII Comparison table of pH value and temperature of standard buffer solution
temperature ℃ pH4. 00 PH6 86 PH9 18 ℃ pH4. 00 PH6 86 PH9 18
0 4．01 6．98 9．46 45 4．04 6．83 9．04
5 4．00 6．95 9．39 50 4．06 6．83 9．02
10 4．00 6．92 9．33 55 4．07 6．83 8．99
15 4．00 6．90 9．28 60 4．09 6．84 8．97
20 4．00 6．88 9．23 65 4．11 6．84 8．95
25 4．00 6．86 9．18 70 4．12 6．85 8．93
30 4．01 6．85 9．14 8 0 4.16 6.86 8.89
35 4.02 6.84 9.10 90 4.20 6.88 8.86
40 4.03 6.84 9.07 95 4.22 6.89 8.84
8. After sales service
the instrument is guaranteed for one year from the date of leaving the factory to guarantee the defects caused by proction and materials. If the instrument needs to be repaired or replaced ring the warranty period, and the cause of damage is not caused by the user's carelessness or improper use, please send the instrument to our agent or our company, and we will repair it
calibration method of acidimeter
1. Preheat, turn on the power, press the pH key, and the indicator light will be on. In order to stabilize the zero point, it is necessary to preheat for more than 30 minutes
2. Install the electrode glass, insert the electrode plug into the socket, and connect the calomel electrode lead to the terminal
3. Temperature compensation turn the temperature compensator to the actual temperature of the solution to be measured
4. Adjust the zero point to point the shift switch to "6", and turn the zero point regulator to make the pointer point to "1" in the scale center
5. Correct the shift switch to "correct", turn the correction regulator to make the pointer point to "2.0" at full scale
6. Repeat steps (4) and (5) until the indication is stable
7. When the temperature of the calibration solution and the standard buffer solution is the same, check the pH value of the standard buffer solution at this temperature. Add the standard buffer solution into the small beaker, put in the stirrer, immerse the electrode, start the stirrer, turn the shift switch to the position corresponding to the known pH value, press the reading switch, and rotate the positioning regulator to make the pointer stable at the pH value of the standard buffer solution at this temperature. After adjustment, release the reading switch, remove the solution, rinse the electrode, and dry the water attached to the electrode with filter paper
8. Measure immerse the electrode in the solution to be measured, press the reading switch, and adjust the shift switch until the indicated value can be read out. The pH value of the solution to be measured is the indicated value of the shift switch plus the pointer.
range: pH 0.00 ~ 14.00ph
temperature - 9.9 ~ 99.9 ℃
16 ~ 210 ℃
resolution: pH 0.01ph
temperature: 0.1 ℃ 0.1 ℃ (16 ~ 99 ℃)
accuracy: pH ± 0.05ph
temperature: ± 1 ℃ ± 2 ° f
input impedance: 1012
calibration: 1-point or 2-point calibration
power supply: 9V power adapter
operating environment: 5 ~ 50 ℃ RH ≤ 95%, no magnetic interference around the instrument, no significant source
overall size: 208 × two hundred × 76mm long × wide × The instrument has three functional interfaces and two switches, each of which has unique pluggability to ensure that you will not connect wrong
[power] power socket [on / off] power switch
[Ph / ORP] pH composite electrode or ion electrode interface [temp] temperature sensor socket
[℃ / ℃] Fahrenheit and centigrade selection switch (this measurement mode should be selected before the instrument is powered on)
IV. operation
& ᦇ 8226; Connect the pH electrode, temperature sensor and power supply, select the temperature mode, and press the [on / off] switch to turn on the power supply< br />• Remove the protective cap of pH electrode and insert pH electrode and temperature sensor into the solution to be measured< br />• Gently shake the pH electrode a few times, do not let the bubble on the electrode ball have bubbles, otherwise the measurement accuracy will be affected. When the indication is stable, read the pH value and temperature value< br />• After the measurement, clean the electrode with clean water and put on the protective cap< 5. PH calibration; Pour an appropriate amount of ph6.86 and 4.01 (or 9.18) standard buffer solution into a clean beaker< br /> • For accurate calibration, two beakers were used for each buffer solution, one for rinsing electrode and the other for calibration. In this way, the degree of contamination of the buffer solution can be minimized< br />• Turn on the power switch, immerse the pH electrode and temperature electrode in the buffer solution with pH value of 6.86, and shake them gently< br />• When the indication is stable, use a small screwdriver to adjust the "STD" potentiometer on the left side of the panel until the displayed value is consistent with the pH value of the calibration buffer solution at the measured temperature< br />• Insert the electrode into ph4.01 (or 9.18) standard buffer solution and gently shake the electrode< br />• When the indication is stable, use a small screwdriver to adjust the "slope" potentiometer on the right side of the panel until the displayed value is consistent with the pH value of the calibration buffer solution at the measured temperature. In this way, the calibration of pH gear is completed
under the following circumstances, the instrument must be recalibrated< br />• The electrode has been replaced; After calibration, it should be used or placed for a long time
&8226; The electrode is used frequently; 6. Maintenance of pH electrode and instrument; The electrode interface of the instrument must be kept dry and clean< br />• After each measurement, the electrode should be cleaned and soaked in potassium chloride solution (3mol / L)< br />• The measuring electrode shall not be immersed in distilled water, protein solution or acidic fluoride solution for a long time
if the electrode is contaminated, clean it with detergent as described below
pollutant cleaning agent
inorganic metal compound less than 1mol / L dilute acid
organic grease material dilute washing solution (weak acid)
resin macromolecule material alcohol
protein blood cell sediment acidic enzyme solution
pigment material dilute bleaching solution
VII Comparison table of pH value and temperature of standard buffer solution
temperature ℃ pH4. 00 PH6 86 PH9 18 ℃ pH4. 00 PH6 86 PH9 18
0 4．01 6．98 9．46 45 4．04 6．83 9．04
5 4．00 6．95 9．39 50 4．06 6．83 9．02
10 4．00 6．92 9．33 55 4．07 6．83 8．99
15 4．00 6．90 9．28 60 4．09 6．84 8．97
20 4．00 6．88 9．23 65 4．11 6．84 8．95
25 4．00 6．86 9．18 70 4．12 6．85 8．93
30 4．01 6．85 9．14 8 0 4.16 6.86 8.89
35 4.02 6.84 9.10 90 4.20 6.88 8.86
40 4.03 6.84 9.07 95 4.22 6.89 8.84
8. After sales service
the instrument is guaranteed for one year from the date of leaving the factory to guarantee the defects caused by proction and materials. If the instrument needs to be repaired or replaced ring the warranty period, and the cause of damage is not caused by the user's carelessness or improper use, please send the instrument to our agent or our company, and we will repair it
calibration method of acidimeter
1. Preheat, turn on the power, press the pH key, and the indicator light will be on. In order to stabilize the zero point, it is necessary to preheat for more than 30 minutes
2. Install the electrode glass, insert the electrode plug into the socket, and connect the calomel electrode lead to the terminal
3. Temperature compensation turn the temperature compensator to the actual temperature of the solution to be measured
4. Adjust the zero point to point the shift switch to "6", and turn the zero point regulator to make the pointer point to "1" in the scale center
5. Correct the shift switch to "correct", turn the correction regulator to make the pointer point to "2.0" at full scale
6. Repeat steps (4) and (5) until the indication is stable
7. When the temperature of the calibration solution and the standard buffer solution is the same, check the pH value of the standard buffer solution at this temperature. Add the standard buffer solution into the small beaker, put in the stirrer, immerse the electrode, start the stirrer, turn the shift switch to the position corresponding to the known pH value, press the reading switch, and rotate the positioning regulator to make the pointer stable at the pH value of the standard buffer solution at this temperature. After adjustment, release the reading switch, remove the solution, rinse the electrode, and dry the water attached to the electrode with filter paper
8. Measure immerse the electrode in the solution to be measured, press the reading switch, and adjust the shift switch until the indicated value can be read out. The pH value of the solution to be measured is the indicated value of the shift switch plus the pointer.
7. Hello! I'm glad to answer for you. It's the program file of QQ HD Mini
8. 1. GPRS (General Packet Radio
Service) is a general packet radio service, which is a new packet data carrying service developed on the existing GSM system. The fundamental difference between GPRS and GSM is that GSM is a circuit switching system, while GPRS is a packet switching system. GPRS is especially suitable for intermittent, sudden or frequent, small amount of data transmission, but also suitable for occasional large amount of data transmission. We can understand GPRS as a higher level of GSM< 2. WAP (wireless application
protocol) is a wireless application protocol in Chinese, which belongs to a different category from GPRS. Its purpose is to introce the rich information and advanced services of the Internet into the wireless terminals such as mobile phones. To make an analogy, GPRS and GSM are roads, while WAP is a car on the road. After China Mobile opened GPRS, WAP will drive on the road of GSM and GPRS, and driving on the road of GPRS can improve the speed of data transmission. Therefore, the content on the existing WAP can also be browsed and applied through GPRS. 3. CDMA is a mobile communication technology parallel with GSM. It is the abbreviation of CDMA digital wireless technology. It has the advantages of high frequency utilization and low power consumption of mobile phone. Like GSM, CDMA has 2G, 2.5G and 3G technologies. The CDMA that China Unicom will launch in the second half of this year belongs to 2.5 generation technology. CDMA is considered to be the first choice of 3G mobile communication technology. The current standards include WCDMA, CDMA2000 and TD-SCDMA.
Service) is a general packet radio service, which is a new packet data carrying service developed on the existing GSM system. The fundamental difference between GPRS and GSM is that GSM is a circuit switching system, while GPRS is a packet switching system. GPRS is especially suitable for intermittent, sudden or frequent, small amount of data transmission, but also suitable for occasional large amount of data transmission. We can understand GPRS as a higher level of GSM< 2. WAP (wireless application
protocol) is a wireless application protocol in Chinese, which belongs to a different category from GPRS. Its purpose is to introce the rich information and advanced services of the Internet into the wireless terminals such as mobile phones. To make an analogy, GPRS and GSM are roads, while WAP is a car on the road. After China Mobile opened GPRS, WAP will drive on the road of GSM and GPRS, and driving on the road of GPRS can improve the speed of data transmission. Therefore, the content on the existing WAP can also be browsed and applied through GPRS. 3. CDMA is a mobile communication technology parallel with GSM. It is the abbreviation of CDMA digital wireless technology. It has the advantages of high frequency utilization and low power consumption of mobile phone. Like GSM, CDMA has 2G, 2.5G and 3G technologies. The CDMA that China Unicom will launch in the second half of this year belongs to 2.5 generation technology. CDMA is considered to be the first choice of 3G mobile communication technology. The current standards include WCDMA, CDMA2000 and TD-SCDMA.
9. Phaeton Phaeton, a Volkswagen luxury car, is now out of proction.
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