Can the explosion-proof disturbance-resistant tube be connected directly to the instrument?
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The field instruments are connected directly to the explosion-proof disturbance pipes, with no compression in between. Is this acceptable? The main issue is that the threaded holes on the instruments are not deep enough; if rubber seals or compression rings are used, it becomes impossible to ensure a proper connection of the explosion-proof tubing (this is mainly to allow more turns of thread). It’s not economical to buy a complete set of connectors and such.
Normally, it’s connected directly, but make sure to take waterproof measures – wrap some tape around the explosion-proof threaded connections
To use explosion-proof disturbance-resistant tubes, Y-connectors must be used to seal the cables, especially for explosion-proof instrumentation. A direct connection does not comply with explosion-proof design requirements, as you have not sealed the cables inside the pipe.
I used a Y-shaped connector, but it was between the explosion-proof disturbance-resistant tube and the galvanized steel pipe for wiring. I said there is no seal at the interface between the explosion-proof disturbance-resistant tube and the instrument.
A direct threaded connection will suffice; if a flange is used, a seal is required；
Remove the gland on the instrument and connect it directly.
OP, that’s called an explosion-proof flexible tube – an explosion-proof wiring conduit that can bend in different directions to a certain extent.
Some of the instrument interfaces here come with seals built in, so the explosion-proof disturbance-resistant hoses can be connected directly. If the instrument does not come with its own seal, simply ask the supplier to provide one when purchasing the explosion-proof disturbance-resistant hose.
It seems to me that they’re all connected directly, with no switching involved.
The field instruments are connected directly to the explosion-proof disturbance pipes, but it’s essential to ensure proper sealing; otherwise, the explosion-proof function will not be achieved! If it gets water in again, it will be more troublesome.
The main function of an explosion-proof flexible tube is to provide explosion protection; it is essential to ensure a tight connection at the joints, otherwise it loses its purpose. Additionally, flexible pipes are equipped with adapter fittings; by using these adapters, the length of the flexible pipe can be increased to achieve a secure connection.