How to deal with minor malfunctions in the planktonic bacteria sampler?

As a commonly used detection instrument, the planktonic bacteria sampler can accurately reflect the micro concentration in clean rooms, and has the advantages of large sampling volume, stable performance, and easy operation. At the same time, it is also an efficient porous suction micro collector designed according to the theory of constant velocity sampling. The sampling is direct, and the wind speed at the collection head is basically consistent with the wind speed in the clean room, accurately reflecting the concentration of micro particles in the clean room.
It is inevitable that problems may arise with the long-term use of planktonic bacteria samplers. It's not that the quality of the products produced by the manufacturer is problematic. No matter what is used for a long time, there will always be some minor problems. Therefore, learning some simple maintenance methods for the planktonic bacteria sampler is the hard truth:
Common faults and solutions in the use of floating samplers:
1. Connect the power, the indicator light does not light up
(1) If there is no voltage output from the instrument, check if the fuse ALL has melted;
(2) If the instrument has voltage output, check if the indicator light is burnt out;
(3) If the fuse is not blown, check whether the transformer of the instrument is burned out due to a local short circuit in the circuit.
2. When the power is turned on, the instrument head indicator is unstable or the pointer is not positioned properly
(1) Open the instrument panel to check if the header is stuck and observe if there are any foreign objects on the coil;
(2) Check if the instrument casing is grounded.
3. Without connecting the power supply, the instrument head indicator swings significantly; Open the instrument panel and check if the parallel resistance welding at the input end behind the meter head is secure.
4. The digital acidity meter displays unstable or drifting numbers after being powered on
(1) Check if the connectors of the instrument are secure;
(2) Check if the circuit board of the instrument is corroded;
(3) Check whether the input and output voltages of the instrument are stable;
(4) Check if the operational amplifier in the instrument amplification circuit is burnt out.
The above is the solution to the malfunction of the floating sampler.