temperature

I need to measure the signal from a pressure transducer and, using a radio modem, send the signal to a scada package. Most of the small PLC's I have looked at are only rated to 0 C. The unit will be mounted outdoors in a rain tight enclosure, but exposed to -20 C,. The unit needs to operate on 12-24 vdc from a battery. Any recommendations?

Most enclosure manufacturers offer small electric heater/thermostat packages that can be used to maintain temperature in enclosures. I use Hoffman's heater unit as standard on all my outdoor enclosures. They have a built in fan as well.

Tom Jenkins said:

Most enclosure manufacturers offer small electric heater/thermostat packages that can be used to maintain temperature in enclosures. I use Hoffman's heater unit as standard on all my outdoor enclosures. They have a built in fan as well.

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Good idea, but we are running off of a solar panel with battery backup

cold weather PLC

The Modicon TSX Compact PLC from Schneider Electric has components rated for -40 to 75C. Their power supplies are also designed for battery systems as low as 12VDC.

Go to http://www.modicon.com/Default.htm and select the Compact option under PLC & I/O.

Check out ICL ScadaBridge www.iclinks.com

This is a great unit and bone simple to use. Also spec.'s out at -40 to 75 degrees C.

Lenny