Troubleshooting methods for two common faults of atmospheric samplers

Atmospheric samplers can be used for atmospheric environment detection and environmental impact assessment, which can ensure the accuracy of collected data and are widely used in many industries. Atmospheric samplers will also have certain faults during use. The two common faults of atmospheric samplers and their treatment methods hope to help everyone. 1. The motor is out of control (the speed is fast and slow) or does not turn. The signal line from the flow sensor to the main board is short-circuited or the socket is not in good contact: use a multimeter to measure the on-off situation of the signal line connected to the main board. If there is a short circuit, it should be re-welded and reinforced with glue , or replace the leads and sockets. The way to judge the damage of the flow sensor is: when the instrument is turned on (the pump does not turn), disconnect the sensor signal from the main board, and measure its signal. When the positive terminal of the sensor is pressurized, the output signal rises, and the negative terminal of the sensor is boosted When the output signal drops when the pressure is high, it can be judged whether the sensor is good or bad. If the sampling pump is equipped with a carbon brush motor, the common fault is that the carbon brush is worn or the lead wire is in poor contact. If the carbon brush is worn out, replace it with a new one. If the solder joints are found to be weak, re-weld. The sampling pump is equipped with a brushless motor, and the common fault is that the lead wires are not in good contact. Resolder or replace leads. The pump is equipped with a brushless motor, which can solve the problem of clutter interference from the motor to the control circuit from the source. 2. The flow rate is low (large noise) The actual flow rate of the instrument is low (inconsistent with the set flow rate), and the adjustment panel“flow correction”doesn't work. The working sound of the pump of the instrument is uneven and harsh. Check the cumulative working time of the vacuum pump. If it reaches or exceeds 600h, the pump equipped with a brush motor may have serious carbon brush wear. The solution is to replace the carbon brush. When replacing the carbon brushes, open the shell of the instrument, unscrew the fastening screws on the motor barrel, lift the motor out of the motor barrel, fuse the contacts of the old carbon brushes on the motor, carefully insert the new carbon brush into the position of the old carbon brush, and weld Make good contacts, install the motor as it is, and run it idly for 6 hours without the filter membrane to break in the carbon brush.

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