General purpose ambient safety monitor features proprietary compensation for changes in barometric pressure that virtually eliminates the false alarms associated with competitive monitors. The enhanced stability of the GPR-35 makes it ideal for oxygen deficiency monitoring in ambient areas and confined spaces. When needed the most, battery back-up provides 8 hr of continuous use in full alarm mode. In addition to OSHAâ€s 20.0%, 19.5% alarm set points this monitor offers additional standard features along with a variety of options that greatly enhance the usability of this device.Calibration - ambient air or certified span gasBarometric pressure and temperature compensationControls - tamper proof potentiometer for span calibration>0.995% over all ranges linearityResponse time - 90% of final reading in 13 secCorrosion resistant wetted partsNon-condensing up to 95% humiditySample system - none, sensor exposed to ambient atmosphereSensor - model GPR-11-32-RTS, 32 months expected life in air at 25 deg C, 1 atmosphere and 12 months warranty timeAlarm type - two adjustable SPDT form C non-latching relay contacts, preset to OSHA 20.0% caution, 19.5% danger settingsInstallation - category II, pollution degree, 2, altitude 12 months warranty. Brand Name|Advanced Instruments#MFR Part Number|GPR-35 PRX#UNSPSC|41113110#Item|Oxygen Analyzer#Type|General Purpose#Series|GPR-35#Accuracy|<2%#Detection Range|0 - 25%#Alarm Type|Two Adjustable SPDT Form C Non-Latching Relay Contacts#Signal Output|0 - 1 VDC#Display|0.1% Resolution 3-1/2 Digits LCD#Operating Temperature|5 - 45 deg C#Power Source|100/110/220/240 VAC#Enclosure Type|NEMA 4X, Indoor#Dimensions|4 x 9 x 3 Inch#Includes|Extension Rod#Process Application|Monitor oxygen content of ambient atmospheres or confined spaces#Standard/Approvals|CE Certified, CSA Certified, ISO Certified