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PH sensor principle of work

Number of visits: Date:2016.12.26

The pH amplifier inside the sensor is a circuit with a standard pH electrode that can be monitored by a data collector. The end of the sensor connector is a BTA plug or a 5-pin DIN plug to connect to the data collector.
In the buffer solution of pH 7, it will produce a voltage of 1.75 V. PH value increased by 1, voltage increased by 0.25 V. PH value is reduced by 1 and the voltage is reduced by 0.25 V.
The design of this gel filled pH sensor is in the range of 0 to 14. It is a kind of good equipment for scientific research and environmental measurement in junior high school, high school and university. The gel filled reference half cell is sealed, so it does not need to be charged.
Technical index
Seal, gel filled, epoxy body, silver / silver chloride
Response time: 90% seconds to complete the reading
Temperature range: 5 to 80 degrees C
Specification: outside diameter 12 mm
Range: pH 0 - 14
Resolution (LabPro, ULI II, SBI):0.005 pH
Resolution (CBL, CBL 2):0.02 pH
PH value and other potential lines: pH value 7 (at this time the temperature of the pH value without any effect)
Output: 59.2 mV/pH (25 degrees C)
Calibration pH sensor
We don't think it is necessary to calibrate the sensor when you use the pH sensor in class. We have set the sensor before we leave the factory. You just need to use the proper scale stored in the data acquisition program. There are the following ways:
1, when the sensor is connected to the data collector, run the acquisition program LabPro, it will automatically load calibration calibration.
2, if you use the Logger Pro software, open the pH sensor, an experimental file, it will store the calibration scale will be loaded at the same time. If you want to have a chemical experiment, or do a water quality test requires a higher accuracy, naturally you can follow the steps of calibration:
The 2 point method is used to calibrate the data acquisition program. Flush sensor head with distilled water. Put the sensor into a buffer solution (e.g. pH = 4). When the computer, calculator or CBL screen display voltage readings are stable, enter the pH value: 4.
Second calibration points, flush the sensor, and put the sensor into the buffer solution (e.g. pH = 7). When the displayed voltage readings are stable, enter the pH value: 7.
Flush the sensor head with distilled water and put it into the sample solution to be tested.
To collect the data from the experiment
PH sensor experiment using computer. PH sensor can be used in conjunction with the Vernier LabPro data acquisition via USB or serial connection Apple computer or PC computer. Here are the general steps of using a computer to connect to the sensor:
1, pH sensor connected to the appropriate channel interface.
2, start the computer to collect data on the Logger Pro software.
3, open a pH Sensor Experimental file, you can immediately collect data.
In addition to using the computer to test the acquisition of data, you can also use TI image calculator Palm OS handheld computer for data acquisition
Example
All of the traditional pH meter experiments or demonstrations can use our pH sensor. Using this sensor can automatically collect data, make charts, data analysis and other functions. It is typically used on a family of common acid and alkali, acid-base titration, in chemical reaction, the aquarium photosynthesis process monitoring the change of pH, acid rain and buffer, river and lake water quality analysis.
Vernier is more experimental manual all use pH sensor experiment.
Note: This product is suitable for educational use only and is not suitable for industrial, medical, research, or commercial applications.
Ready to use
Please follow the steps below to prepare the electrode measurements pH:
First unscrew the lid, the sensor is taken out from the storage bottle, and then take the bottle and lid. The sensor head, in particular the spherical portion, is thoroughly cleaned with distilled water.
The sensor is not stored in a storage bottle, and can also be stored in a buffer solution of pH 4 or 7 for a period of time (less than 24 hours). Do not store in distilled water.
Connect the pH sensor with the data collector, load or perform calibration, prepare the measurement.
After the measurement, the head of the sensor is rinsed with distilled water. The sensor is covered with a cover and is covered on the storage bottle. Note: you can put a small amount of tap water (not recommended) a few times when the solution in the bottle is reduced. It is recommended to use the right amount of pH buffer solution of 4 /KCl (see maintenance and storage part) to supplement the lost solution.
pH buffers
In order to calibrate the pH sensor, or to check the calibration scale is accurate, you need to measure the range of pH buffer solution. We recommend that pH values are: 4, 7, 10 buffer solution.
We also sell pH buffer solution sets, ordering code for PHB. Each has 10 pieces, including pH 4, 7, 10 buffer. Simply add 100 ml of distilled water or deionized water.
You can make your own:
Maintenance and storage
Short term storage (less than 24 hours): the sensor is stored in a buffer solution of pH of 4 or 7.
Long term storage (greater than 24 hours): stored in a storage bottle with a pH-4/KCl buffer solution. The pH sensor is in the solution when it is purchased. We also sell pH storage solution, ordering code: PH-SS, or you can also make their own: 10 grams of KCl into the solution of 100 ml pH4. To store, put the sensor head electrode part in solution. Thus, the service life and the quick response of the sensor can be ensured

TypeInfo: Technical support

Keywords for the information:PH