Liquid Turbine Flowmeter Check Route Reasonable Method Introduction
1. When the liquid turbine flowmeter detects the filter capacitor in the power supply, the positive and negative electrodes of the electrolytic capacitor should be short-circuited first, and the lead can be used instead of the lead to discharge the capacitor when it is short-circuited, because it is easy to blow the core wire. It is possible to take a 220V, 60 to 100W lamp with a cap lead, which is connected to both ends of the capacitor. The lamp will flash at the moment of discharge.
2. When using the multimeter's ohmic block, remember that it cannot be charged. When using logic pens and oscilloscopes to detect signals, be careful not to make probes contact both measurement pins at the same time. The essence of this situation is to form a short circuit when the power is applied. When troubleshooting a meter in a wet environment, it is necessary to measure whether the various points on the printed circuit are unobstructed. The main fault in this case is the corrosion of the copper foil.
3. When the internal flowmeter of the turbine flowmeter of the liquid sample is repaired, if the contacts and the circuit board of the mounting component are coated with insulating varnish, the parameters of each point can be measured by using ordinary hand-stitched needles on the test leads of the multimeter so as to pierce the paint layer. Measure the points directly without stripping the paint layer in large areas. It is not possible to hot plug various control boards and plugs. Because of the power-on condition, plugging the control board will generate a strong induced electromotive force. At this moment, the instantaneous counter-attack voltage is very high, and it is easy to damage the corresponding control board and plug.
4, when the maintenance can not be blindly chaotic knock, so as not to expand the failure, the more repair and more bad. When disassembling and adjusting the instrument, record the original position for recovery. When the liquid turbine flowmeter repairs precision instruments and meters, if you accidentally fly a small part, you should first determine where it may fly, and do not look east or west. You can use magnet scanning and line-of-sight scanning methods to find out.
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