Radar level gauge needs to be repaired during long-term use. Below we will analyze and explain the precautions for radar liquid external inspection.
1. Use the multimeter to detect the radar liquid level timing on the spot, and remember not to take the live measurement. The current output of the radar level gauge is 22Ma
2. When using a logic pen, oscilloscope, etc. to detect the radar level gauge signal, be careful not to make the probe touch the two measurement pins at the same time, because the essence of this situation is to form a short circuit under power-on.
3. When detecting the filter capacitor in the power supply, first short-circuit the positive and negative poles of the electrolytic capacitor, and do not use the test lead wire instead of the wire to discharge the capacitor when short-circuiting, because it is easy to burn the core.
line. You can take a 220V, 60 ~ 100W lamp with a lamp lead, connected to the two ends of the capacitor, the bulb will flash when the battery is discharged.
4. When repairing the radar level gauge in a humid environment, it is necessary to measure the smoothness of each point on the printed circuit with a multimeter, because the main fault in this case is copper foil corrosion.
5. When repairing the internal circuit of the radar level gauge, if the contact points of the mounted components and the circuit board are coated with insulating varnish, the parameters of each point can be measured by ordinary hand stitching on the meter of the multimeter to pierce the paint.
The layer measures each point directly without stripping the lacquer layer over a large area.
6. Do not plug and unplug various control boards and plugs. Because in the case of power-on, the plug-in control board will generate a strong induced electromotive force, and the instantaneous counter-attack voltage is very high, which easily damages the corresponding control board.
And plug.
7. Overhaul the radar liquid level timing. Do not blindly knock and knock, so as not to expand the fault, the more repaired the worse.
8. On-site need to disassemble the radar level gauge, or adjust the parameters inside, you need to record the original position, or the original parameters, to restore to the original state.
9. Radar level gauges generally have a factory reset function that can be restored to factory settings.
In the maintenance process of the radar level gauge, it is necessary to understand the basic working principle of the radar level gauge, understand the structure of the radar level gauge, and understand some of the most basic simple operations.
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