Interpretation Atmospheric sampler malfunction –

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 irregular and harsh. Check the accumulated working 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 in thecarbon 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 way 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 positive terminal of the sensor is pressurized, the output signal increases and the negative terminal of the sensor is amplified. When the output signal drops when the pressure is high, it can be determined whether the sensor is good or bad. If the sampling pumpis 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, replace it with a new one. If the solder joints turn out to be weak, solder again. The sampleg pump is equipped with a brushless motor, and the common fault is that the lead wires are not in good contact. Resolder or replace wires. The pump is equipped with a brushless motor, which can solve the problem of motor footprint interference to the source control circuit.

Prev: Interpretation of the method of increasing the cooling rate of the box-type vacuum atmosphere furnace