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Installation of capacitive level gauge

2024-01-23 14:14

When installing outdoors, the probe wire should not be exposed outside the container to avoid measurement errors caused by water contact on rainy days.

The stainless steel process connection components at the bottom of the casing or junction box must be reliably connected to the outer wall of the container (grounded), and their contact resistance cannot exceed 2.

In normal operation, the probe wire should not have a significant oscillation amplitude inside the container, otherwise signal instability may occur.

When installing the probe wire, it should be kept as far away from the inner wall of the container as possible, and the small distance should not be less than 100mm. When restricted by conditions and the distance is less than 100mm, the distance between the probe line and the container must be relatively fixed.

For single wire soft probes, the excess part can be cut off by pulling out the upper end of the process connector, and then tightening the deposit bolt. For twisted pair probes, the excess part can be coiled above the measured liquid level, and it is absolutely not allowed to coil the excess part at the bottom of the container or the effective measurement section.

When there is stirring or liquid in the container that may produce a large number of bubbles, in order to protect the probe wire and avoid liquid fluctuations and false liquid levels caused by bubbles, a metal or non-metallic tube with an inner diameter of>80mm can be placed in the container. The lower end of the tube should have an opening for liquid inlet, and an exhaust hole should be left below the liquid level. When using a metal tube, the position of the probe wire inside the tube should be ensured to be quite stable. If necessary, the probe wire should be supported and straightened.

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