What should I do if the indicator light of the pH meter is not on when the power is turned on?
The pH meter is powered on, but the indicator light is off
(1) If the instrument has voltage output, check whether the indicator light is burnt out;
(2) If the instrument has no voltage output, check whether the fuse ALL is new;
(3) If the fuse is not blown, check whether the transformer of the instrument is burned out due to a partial short circuit in the circuit.
2. When the pH meter is connected to the power supply, the indicator on the instrument head is unstable or the pointer is not positioned
(1) Open the panel of the instrument to check whether the meter head is stuck, and observe whether there is any foreign matter on the coil;
(2) Check whether the instrument case is grounded.
3. The pH meter is not connected to the power supply, and the indicator on the instrument head swings sharply; open the instrument panel to check whether the parallel resistance welding at the input end behind the meter head is firm.
4. After the pH meter digital pH meter is powered on, the displayed number is unstable or drifts
(1) Check whether the connectors of the instrument are firm;
(2) Check whether the input and output voltage of the instrument are stable;
(3) Check whether the circuit board of the instrument is corroded;
(4) Check whether the operational amplifier in the amplifier circuit of the instrument is burnt out.
5. The output indication of the pH meter is inaccurate; the detection method is incorrect or the temperature and slope adjustment points are incorrect.
6. The two standard solutions cannot be used for mutual positioning; check whether the standard signal generator is inaccurate.
7. The pH meter can work normally when it is directly input, but the indication value is out of tolerance when it is connected in series with high resistance.
(1) Check whether the filter capacitor of the instrument is broken down;
(2) Check whether the input resistance of the field effect bamboo of the instrument is low;
(3) Check whether the circuit board of the instrument is damp or corroded.
8. After the digital acidity meter is powered on, the numbers displayed are missing strokes
(1) The connector of the instrument is not in good contact;
(2) The digital display of the instrument is damaged.
9. The temperature, slope or correction adjustment knob on the pH meter panel is out of order; check whether the potentiometer connected to the out-of-function knob is damaged.
