How to seal the instrument inlet
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Dear teachers, on-site cables are connected to instruments via flexible conduits. However, many instruments have gotten wet; the water entered through these flexible conduits. How can we prevent this from happening? Are there any waterproof connectors available for this purpose?
It’s unclear whether an amateur’s bad idea will work; P might try using \"foam adhesive\" as a reference.
One method is to block it at the source, that is, at the end connected to the cable tray. Another method is to install a tee fitting at the lowest point of the galvanized pipe (below the gauge); one end of the tee is used for drainage, while the other end connects to an explosion-proof flexible hose leading to the instrument. This way, all the water can be drained away. Normally, explosion-proof flexible hoses should be equipped with sealing rings; however, most construction crews remove them to facilitate wire threading. Ultimately, this is due to non-standard construction practices.
Don’t flexible pipes have waterproof bends? For a more refined setup, install a drain outlet, or simply opt for a discontinuous protection method by replacing the flexible conduit with gland seals.
The instruments themselves are waterproof and dustproof, and proper installation ensures that no water will get inside them. When installing flexible hoses, they should be installed at a certain angle to prevent water accumulation.
It seems that your hose indeed lacks a gasket; only by adding one can it function properly. You can buy a gasket on Taobao and install it.
Is there a Gran Head that can be connected to a flexible tube?
Yes, explosion-proof sealed stuffing box. Equipped with an explosion-proof sealing gasket; one end is connected to the explosion-proof hose, and the other end is connected to the instrument inlet
Add an explosion-proof tee between the instrument and the flexible tube, and fill it with explosion-proof sealing putty
If that’s a problem, then without Gran, how were the flexible tubes connected to the instruments before? If the cable in an explosion-proof area is armored, there is no need to add an explosion-proof flexible conduit, unless the medium is extremely flammable. But I don’t understand why water gets into the instrument; generally, the wiring inlet for instruments isn’t designed to be installed with it facing upward. Otherwise, make a 90° bend and then make the connections
Was the seal ring inside the instrument thread removed? It’s still better to use a gland fitting; there are special connectors available for connecting gland fittings to flexible hoses