1794-IT8/A && Leakage Current - PLCS.net

Wormfood · July 14th, 2010, 11:17 AM

Installing a IR T/C onto a DeviceNet Flex IO drop. Card is a thermocouple card 1794-IT8/A. According to the manufacturer, I'm getting leakage current into the card and it is throwing off my reading.

Testing
1. Hooked regular T/C to point - Reads fine. @ 140 Degrees
2. Hooked IR T/C to point - Reads 312 Degrees
3. Hooked regular T/C into test unit we have - Reads fine 80 degrees
4. Hooked IR T/C into tester - Reads find 80 degrees.
5. Switched channels with a known working T/C - Same result as #1 and #2

Vendor info:
http://www.exergen.com/industrl/irtc...hnote_001.html
http://www.exergen.com/industrl/irtc...hnote_016.html

I can not find anyway to zero out the card based on the companies installation instructions. How do I kill off the leakage current? Will a pull down resistor do the trick?

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July 14th, 2010, 11:17 AM	#1
Wormfood Member Join Date: Nov 2009 Location: Jonesboro, AR Posts: 23	1794-IT8/A && Leakage Current Installing a IR T/C onto a DeviceNet Flex IO drop. Card is a thermocouple card 1794-IT8/A. According to the manufacturer, I'm getting leakage current into the card and it is throwing off my reading. Testing 1. Hooked regular T/C to point - Reads fine. @ 140 Degrees 2. Hooked IR T/C to point - Reads 312 Degrees 3. Hooked regular T/C into test unit we have - Reads fine 80 degrees 4. Hooked IR T/C into tester - Reads find 80 degrees. 5. Switched channels with a known working T/C - Same result as #1 and #2 Vendor info: http://www.exergen.com/industrl/irtc...hnote_001.html http://www.exergen.com/industrl/irtc...hnote_016.html I can not find anyway to zero out the card based on the companies installation instructions. How do I kill off the leakage current? Will a pull down resistor do the trick?

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