What is the type of frequency control signal for the pump?
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The variable frequency control signal for the pump is 4~20mA; this signal is sent via the DCS to enable variable frequency control. May I ask whether this 4–20mA signal is typically intrinsically safe or explosion-proof? Are both situations possible?
4~20mA is just an electrical signal; it has nothing to do with intrinsically safe or explosion-proof concepts as you mentioned! Intrinsic safety and explosion protection are methods for protecting electrical equipment!
Intrinsic safety or explosion protection is not required; this signal cable runs from the power distribution room to the control room, and these two locations are not in areas at risk of explosion.
Signals are indeed divided into intrinsically safe and explosion-proof types, but explosion protection needs to be considered because the equipment is located in an area with explosion hazards. The power distribution room is a safe environment, so there is no need to consider explosion protection for signals.
Intrinsic safety and explosion protection depend on the environment. . . . . . . . . . . . . . . . . .
The signals are not classified by explosion-proof rating; the hardware ensures explosion protection
The power distribution room is not a safe environment; are you trying to scare me?
I don’t think it’s necessary; our company doesn’t use it – it’s sent directly from the card to the inverter
I don’t think it’s necessary; our company doesn’t use it – it’s sent directly from the card to the inverter