The pH electrode is the most widely used, but many users do not know much about the maintenance of the electrode, and the operation failure causes the electrode to be damaged. This article provides a basic introduction to the electrode and also presents some very useful maintenance advice. It is believed that the user can choose the correct maintenance method, prolong the service life of the electrode and improve the accuracy of the test results. US BJC online sewage detection pH electrode
US BJC S400-RT330-A10FF online sewage detection pH electrode features:
It is specially designed for on-line pH detection in harsh industrial processes. It is structurally robust and uses a double-stage reference electrode design for high contamination resistance. The electrodes are self-threaded (3/4" threads on the top and bottom) for flexible mounting; the electrode body is made of corrosion-resistant Ryton (PPS); the reference diaphragm is porous Teflon or ceramic. The user can choose a temperature probe with a glass head cover as standard to avoid breaking the glass film.
US BJC S400-RT330-A10FF online sewage detection pH electrode technical parameters:
pH range: 0 - 14 pH
Temperature range: 0 - 105 ° C
Withstand voltage: 150 psig at 100 °C
Reference electrode: Ag/AgCl
Liquid connection material: Ryton, Teflon, glass
Standard cable length: 10 feet low noise cable
US BJC S400 online pH electrode with Pt100 temperature compensation and 3 meter line
Application: online water and sewage detection
Installation method: immersion and pipeline installation
US BJC S400-RT330-A10FF online sewage detection pH electrode inspection procedures
The purpose of the test is to determine if the electrode function is good! ZP (zero potential) and slope (efficiency) are two important indicators for determining electrode performance. When the zero potential exceeds 45 mV, and / or the electrode slope is lower than 60%, it indicates that the electrode has to be changed. Also pay attention to the reaction speed of the electrode. Please follow the steps below to judge the performance of the electrode. The required equipment includes: pH 7.0 [Industrial Electrical Network-cnelc] 0 standard solution, pH 4.01 standard solution, pH meter with mV output.
The host is set to the mV test state. Short the input of the pH meter, or use the mV generator to output a 0mV signal to the host and adjust to 0.0mV. Remove the shorting tab or mV generator and connect the electrode to be tested. Rinse the electrode thoroughly with distilled water to remove any residual liquid, such as the preservation solution, process media, or the last test solution. After removing the standard solution from the electrode, rinse it thoroughly with distilled water to prevent cross-contamination of the standard solution. Carefully wipe off the distilled water remaining on the electrode with a soft damp cloth (fiber type). Never scratch the glass sensing film to prevent static buildup. Insert the electrode and ATC (automatic temperature compensation probe) into the pH 7.00 standard solution and wait for 30 seconds to bring the electrode and temperature probe to thermal equilibrium, the same temperature as the standard solution. Write down the mV value, including polarity. This is the zero potential of the electrode, which is theoretically 0 mV at 25 °C.Note: If the host does not have ATC, insert the thermometer and pH electrode into the pH 7.00 standard solution, wait for 30 seconds, and let the electrode and thermometer reach the thermal equilibrium, which is the same as the standard solution temperature. Enter the measured temperature value from the main unit and write down the mV value, including the polarity, which is the zero potential of the electrode. Repeat step 4 to insert the electrode and ATC into the 4.01 standard solution. After 30 seconds, record the mV value. Calculate the difference between the two mV values, which is the SPAN of the electrode. The span is separated from the theoretical span of 176.9 mV (at 25 °C), and the result is multiplied by 100 to obtain the electrode slope.
Note: To make the test more accurate, the pH standard must be at 25 ° C. Otherwise, calculate the pH at the current temperature from the label on the standard bottle.
example:
7.00 standard solution reading: -7.4 mV 4.01 standard reading: +164.6 mV
Zero potential = -7.4 mV Span = +164.6 mV-(-7.4)=172.0 mV
Slope = (172.0 mV / 176.9 mV) × 100 = 97%
Note: It is recommended to check the electrodes frequently to maintain good performance of the electrodes.
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