Maintenance issues with flameproof instruments
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How to repair a flameproof instrument that is broken? Since repairs cannot be carried out while the system is powered on as per the regulations, do I need to cut off the power to the entire instrument control system before proceeding with the repairs, or should I disconnect the wiring terminals in the control room before working on it?
Strictly speaking, flameproof instruments are not allowed to be opened for maintenance on-site, as electric sparks could cause an explosion. So, power outage maintenance is needed, as you said.
Unplug the wiring terminals in the control room and then bring them over for repair?
Repairing flameproof instruments requires qualified personnel.
What do you mean by power outage? Do you mean disconnecting the terminals at the control room side and then removing the instruments? Should we cut off all the electricity in the control room?
The original poster has very poor communication skills. 1. If you’re fixing a watch, why turn off the power to the control system? Want to stop the entire device? 2. Repair the electrical circuit that is broken, which means removing the terminals as you mentioned; be careful as there are interlocks that need to be bypassed. If there’s a power outage, you can fix it on the spot if you want; no one forces you to take it away.
In short, charged circuits must not be exposed to the air outside.
The words are sharp, but I understand what you mean. But what does it mean by \"there is an interlock that needs to be bypassed\"? Please advise
Interlock bypass refers to disabling conditional interlocks in a DCS; for example, in the case of shutting down a pump when the liquid level is low, if you want to disconnect terminals to repair the level gauge, you must first disable this low-level interlock in order to carry out the repairs while ensuring normal production operations.
Theoretically, after the instrument is removed, the interface for connecting the anti-explosion power cable should be sealed tightly.