hi michael
thanks for suggestion.

The PC is a dedicated one. its a microbiology lab where all incubators and water baths centraly warmed by a sream of hot water pumped by pipes. i have to control the pumps in order to control the temp. there is only one central source of hot water heated by natural gas. a fan and a rediater is mounted in each enclosure to radiate the energy contained in water. so no problem of using the device for other purposes. my worry is about the degrade in accuracy due to noice. my point for motivation keeping inside a PC were

1. +-5 and +-12 v supplies are available.
2. no extra sheilding and grounding.

can you suggest. what should i do.


thanks

abhishek