If a pressure sensor fails...

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If a pressure sensor fails...

Postby MarkS » Tue Feb 26, 2013 12:28 pm

On the 1126, 1136-1139 series of differential gas pressure sensors, what value does the interface kit see if the sensor fails because the gas temperature is above the sensor's rating. For instance, steam @ 215 degF @ 1 psi. Normally the steam is isolated from the sensor by a pigtail filled with water, so the sensor sees much lower temperatures, but that's the only source of protection.

Right now I'm using a 4-20ma adapter and a pressure transmitter that's rated to 105C (221F), and I'm looking at the 11xx series as a potentially lower cost alternative.
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Re: If a pressure sensor fails...

Postby erik » Tue Feb 26, 2013 1:36 pm

According to the manufacturer's datasheet, the error can be as much as 3 times the rated error outside of the operating temperature range.

If the sensor just completely fails (as in, is destroyed), I would expect either highly erratic measurements at constant pressures, or saturation at either end of the SensorValue range, depending how the internals fail.

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