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Thursday, October 19, 2017
The Automation Safety Community Forum.
Intrinsically Safe
Using a intrinsically safe positioner in non-hazard area

I have a intrinsically safe positioner in non-hazard area. if I don't use I.S barrier in the control system what will be happened?

The device, the positioner, will not be protected from electrical faults in the safe area that could create arcing/sparking conditions in the positioner.

It will function OK as a positioner, just not as an I/S positioner.

The intrinsic safety is only achieved when the loop is engineered for I/S and all the I/S parts are present and wired according the control drawing.

Your installation is not an intrinsically safe loop. It is just have a positioner with an I/S approval label.

By Bob Peterson on 6 June, 2017 - 5:44 pm

If the device is not in a classified area, it does not matter if it has barriers or not.

--
Bob
http://ilbob.blogspot.com/

If the positioner located at Non-Hazardous area then no issue, the device still can work properly without IS Barrier

rgds,
Galih

>I have a intrinsically safe positioner in non-hazard area.
>if I don't use I.S barrier in the control system what will
>be happened?

Nothing, it will work as a positioner in a non hazardous general purpose area.

Most instruments these days are designed for IS, explosion proof and NEMA 4 general purpose service. The supplier only needs to stock one device and the user can wire it as IS, explosion proof or GP.

good luck

By Heinz Janiec on 15 August, 2017 - 3:42 pm

>I have a intrinsically safe positioner in non-hazard area.
>if I don't use I.S barrier in the control system what will
>be happened?

Nothing, it just will work as intended. Using it in a reverse way, having a non-intrinsic positioner in a hazardous area, is not allowed.