An oxygen sensor in this situation is an IDLH (Immediately Hazardous to Life or Health) warning system. DO NOT install an alarm silence switch. That is an invitation to a fatality.
If your system goes flakey near the end of life, replace the sensors well before end of life, or do whatever else it takes to avoid a flakey system. Better yet, replace it with a system that does not have that drawback.
Peter Zavon, CIH
If there's a problem with the liquid nitrogen delivery system, then nitrogen will leak into the room and the oxygen will be displaced; and people need oxygen.
Calibrate the oxygen sensor with calibration gasses (like an oxygen/nitrogen mixture). We use two calibrators, 17% oxygen and 20.9% oxygen. And the unit calibrates just like a pH meter.
Here are a couple of tips to be aware of. Apparently nitrogen asphyxiation does not cause a physiological panic/struggle like carbon dioxide asphyxiation does. So if the sensor alarms, verify that it's a positive or negative alarm with a calibrator gas so you know if you really have a problem. The sensors we use for those units last about a year and tend to go flakey toward the end of their service lives. So you might want to install a switch to silence a false alarm; if you can't silence a false alarm, then you'll definitely need to consider hearing PPE.
Safety & Compliance Officer
Los Angeles County Public Health Lab
>>> On 8/29/2012 at 7:01 AM, in message <205AAA7AEFEF49ADB5CC346CB5D4985F**At_Symbol_Here**owu.prv>, <bjwiehe**At_Symbol_Here**OWU.EDU> wrote:
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