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A pH meter is an instrument used to measure the pH of a solution
.
The pH meter works on the principle of a galvanic battery.
The electromotive force between the two electrodes of the galvanic battery is based on Nernst's law, which is not only related to the properties of the electrodes, but also to the concentration of hydrogen ions in the solution
.
There is a corresponding relationship between the electromotive force of the primary cell and the hydrogen ion concentration, and the negative logarithm of the hydrogen ion concentration is the pH value
.
pH meter is a common analytical instrument widely used in agriculture and industry
.
Soil pH is one of the most important basic properties of soil
.
Factors such as temperature and ionic strength of the solution to be measured should be considered in the pH measurement process
.
Installation and maintenance There are two types of installation methods: flow-through and immersion
.
The sewage treatment plant generally chooses the immersion installation.
For example, the pH meter of the sewage treatment plant is installed in the outlet overflow tank of the grit chamber.
The pH value here is more representative, and the water flow is stable, which will not affect the pH meter.
cause a big impact
.
Regular maintenance helps the meter to measure accurately and extend the life of the meter
.
It should be noted that the cable between the sensor and the transmitter cannot be wet, otherwise the high resistance low voltage signal of the electrode will not be transmitted to the transmitter
.
If the electrode is not measuring, the yellow protective sleeve should be covered, which can keep the electrode in a wet state, which is beneficial to prolong the service life of the electrode
.
Every month or so, the electrode should be cleaned.
First, spray the attachment with a gentle water flow, then soak the electrode in the cleaning solution for a period of time, and then wash it with clean water
.
The sensor holder should also be cleaned
.
After each cleaning, a buffer solution should be used for calibration.
The manufacturer generally provides two bottles of standard solution, one with a pH value of 7, which is used to calibrate the zero point of the instrument; one bottle with a pH value of 4, which is used to calibrate the signal output slope of the instrument.
.
.
The pH meter works on the principle of a galvanic battery.
The electromotive force between the two electrodes of the galvanic battery is based on Nernst's law, which is not only related to the properties of the electrodes, but also to the concentration of hydrogen ions in the solution
.
There is a corresponding relationship between the electromotive force of the primary cell and the hydrogen ion concentration, and the negative logarithm of the hydrogen ion concentration is the pH value
.
pH meter is a common analytical instrument widely used in agriculture and industry
.
Soil pH is one of the most important basic properties of soil
.
Factors such as temperature and ionic strength of the solution to be measured should be considered in the pH measurement process
.
Installation and maintenance There are two types of installation methods: flow-through and immersion
.
The sewage treatment plant generally chooses the immersion installation.
For example, the pH meter of the sewage treatment plant is installed in the outlet overflow tank of the grit chamber.
The pH value here is more representative, and the water flow is stable, which will not affect the pH meter.
cause a big impact
.
Regular maintenance helps the meter to measure accurately and extend the life of the meter
.
It should be noted that the cable between the sensor and the transmitter cannot be wet, otherwise the high resistance low voltage signal of the electrode will not be transmitted to the transmitter
.
If the electrode is not measuring, the yellow protective sleeve should be covered, which can keep the electrode in a wet state, which is beneficial to prolong the service life of the electrode
.
Every month or so, the electrode should be cleaned.
First, spray the attachment with a gentle water flow, then soak the electrode in the cleaning solution for a period of time, and then wash it with clean water
.
The sensor holder should also be cleaned
.
After each cleaning, a buffer solution should be used for calibration.
The manufacturer generally provides two bottles of standard solution, one with a pH value of 7, which is used to calibrate the zero point of the instrument; one bottle with a pH value of 4, which is used to calibrate the signal output slope of the instrument.
.
