WSN-9791troubleshoot erratic readings

We have a WSN-9791 with four WSN - 3212 s. All 3212 s have power supplies OR (don't not running off battery).

Three of the four 3212 s give erratic readings. For example, the following was recorded today to a piece that should be around 70F:

17/10/2012-15:38:20 187,8
17/10/2012-15:39:20 148.9
17/10/2012-15:40:20 139,0
17/10/2012 15:41:20 - 1548.9
17/10/2012-15:42:20 37.2
17/10/2012-15:43:20 158.8
17/10/2012-15:44:20 39.5
17/10/2012-15:45:20 111.5
17/10/2012-15:46:20 206,4
17/10/2012-15:47:20 - 6.6
17/10/2012-15:48:20 188,6
17/10/2012-15:49:20 262.5
17/10/2012-15:50:20 74.1
17/10/2012-15:51:20 102.0

Location appears to play a role - so far two 3212 s different that give erratic readings have been very stable (with reasonable readings, too) when they sit on my desk, but become erratic when moved elsewhere in the building. In addition, one of the erratic nodes goes stable days, then several erratic days, then back to stable. When a node is erratic, all four thermocouples of this node are erratic.

Thinking that this might be a problem with the electrical noise, I put one of the 3212 s on a UPS - no difference. I also changed the channel without wire used for a couple of different parameters, without modification. I moved the 9791 at different locations in the building, again no difference. Thermocouple type parameters have been triple checked.

Any ideas on how to solve this?

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Hi James,

WSN-3212 is sensitive to analog loops mass and power supply noise and maybe it's what you see. To determine if this is the problem, try the following.

1. electrically isolate environmental thermocpule probes

2. connect the ground terminal GND D of the WSN-3212 (PIN 10, 12, 14 or 16)

See you soon,.

Brian has

R & D Product Support Engineer | WSN/network DAQ/University

National Instruments

Tags: NI Products

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