Elcan,
In corrosive environments, you MUST look at everything.
1. what chemical(s) / mixture of chemicals are present?
2. select all components for your job. sensors, so cord grips, conduit, enclosure(s), enclosure purge / pressurization, wire and insulation type, enclosure components, and so on.
3. look at the chemical reactivity of these components and see if they are compatible. if they're not, select another device.
4. do you need seal off's to keep the chemicals out of the enclosure?
5. can you put the enclosure(s) in a safe area and use seal off's?
in a corrosive work area, DETAILS MATTER !
A mechanical designer changed my stainless steel order on a tank just to save $2k, and the acid eat the material within a week, leaked acid everywhere and we had to foot the cleanup bill plus the time and material to replace the tank.
The material requirements were on the design prints and the po to the steel company.
the boss was not a happy camper, especially when he found out the correct materials got changed.
regards,
james