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1. If the power is on, the indicator will not light. â—† The indicator lamp is burned out. â—† The fuse is blown. â—† The circuit is short-circuited and the voltage generator is burned out. 2. The pointer is not positioned. â—† Open the instrument panel and check whether the meter head is stuck. Foreign matter â—† Whether the casing is grounded 3. Digital pH meter is unstable or drifting â—† The voltage is stable â—† The plug is firm â—† The amplifier is burned These are all I know, it may just be fur and I hope everyone is using it. It helps when we have it, and everyone can do it well. 
Everyone should have studied chemistry. The pH meter is a commonly used instrument and equipment, also known as a PH meter. It is mainly used to accurately measure the pH value of liquid medium. The corresponding ion selection electrode can also measure the MV value of the ion electrode. It is widely used in industrial, agricultural, scientific research, environmental protection and other fields. This instrument is also a necessary inspection equipment for QS and HACCP certification of food factories and drinking water plants. A pH meter is an instrument that measures the pH of a solution. The main body of the pH meter is a precision potentiometer. When measuring, the composite electrode is inserted in the solution to be measured, different electromotive force is generated due to the different acidity (hydrogen ion concentration) of the solution to be measured, it is amplified by a DC amplifier, and finally the measured solution is indicated by a reading indicator (voltmeter). The pH value. The pH meter can be used in the 0-14 pH range. The usual problems are: