Interpreting Atmospheric Sampler Failures

1. Low flow (big noise)

The actual flow of the instrument is low (inconsistent with the set flow), and the \"flow correction\" on the setting panel does not work . The operating sound of the instrument pump is uneven and harsh. Check the accumulated running time of the vacuum pump. If it reaches or exceeds 600h, the pump equipped with a brush motor may show significant wear of the carbon brushes. The solution is to replace the carbon brush. When replacing the carbon brushes, open the instrument shell, unscrew the fixing screws on the motor barrel, take the motor out of the motor barrel, fuse the contacts of the old carbon brushes on the motor, carefully insert the new carbon brush in the position of the old carbon brush and solder. Make good contacts, install the motor as it is and run it empty for 6 hours without the filter membrane breaking inthe carbon brush.

2. The motor is out of control (speed is fast and slow) or does not rotate

The signal line between the flow sensor and the main board is short - circuited or the socket is not in good contact: use a multimeter to measure the signal line connected to the main board. On-off conditions, such as a short circuit, must be restored. welded, reinforced with glue or replaced with lead wires and sockets. The method to judge the damage of the flow sensor is as follows: when the instrument is turned on (the pump is not running), disconnect the sensor signal from the main board and measure its signal. When the output signal drops when the pressure is high, it is possible to determine if 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 wiredriver is in poor contact. If the carbon brush is worn, replace it with a new one. If the solder joints turn out to be weak, solder again. 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 representative of lace threads. The pump is equipped with a brushless motor, which can solve the problem of motor footprint interference to the source control circuit.

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