Sensor:Field replaceable electrochemical, 4 years typical lifespan. Recommend calibration every 6 months.Range:CO: switch selectable 200 or 500 ppm; NO2:10 ppm.Output Drift:<5% per year in air.Coverage Area:5000 to 7500 sq ft typical.Accuracy:CO=±2% FS, NO2=±3% FS, at the time of calibration.Resolution:CO=1 ppmTemperature Limits::Ambient: -4 to 122°F (-20 to 50°C); Storage: For best sensor life, 32 to 68°F (0 to 20°C).Humidity Limits:15 to 90% RH constant; 0 to 99% RH intermittent.Response Time:<45 seconds to 90% CO, <25 to 90% NO2.Span and Zero Adjustment:Via pushbutton, using optional A-449 display.Housing:UV resistant glass filled polycarbonate.Output:Switch selectable 4 to 20 mA (loop powered), 0 to 5 V @ 5 mA, or 0 to 10 V@ 5 mA;
Switch selectable 0 to 5 V / 1 to 5 V and 0 to 10 V / 2 to 10 V;
Switch selectable normal or reverse output.Power Supply:Current output=10 to 35 VDC;
Voltage output=15 to 35 VDC or 15 to 29 VAC.Electrical Connection:Removable terminal block, knocks out for conduit fitting.Calibration:Via pushbuttons using A-449 auxiliary display. Span gas concentration is field selectable.Weight:1 lb (.45 kg).Agency Approvals:CE.