Temp Control for Hazardous Locations

[handee]

Hi folks, I haven't had any luck finding a free-standing PID tmperature controller (actuates a modulating cooling water flow valve) that can be located in a hazardous location. The operators will want to adjust the setpoint at will, and the non-XP control room is some distance away. Quite inconvenient if we need to use a non-XP controller. Any suggestions? TIA

 

[JLSeagull]

Pneumatic controls are inherently safe. Discuss using Foundation Fieldbus transmitter and valve controller programmed with the PID in the valve transducer. Lots of PLC's are rated Division 2. I have not looked at the 1/2 DIN or 1/4 DIN controllers in a long time. However, surely some of the 1/4 DIN controllers are rated Division 2.

 

[handee]

Thanks JL. There's an existing 4-20 XP transmitter and we are looking to loop it to a controller. I too expected that some 1/4 DIN units would be rated Div 2, just haven't been able to find one yet.

 

[Compositepro]

There are also self-contained temperature regulating valves that work similarly to self contained pressure regualtors. They are usually used with water. I think Sterlco is one source (or Mcmaster-Carr).