Gas detected: carbon monoxide (CO). Detection principle: electrochemical. Detection range: 0 - 500 ppm (1 ppm). Alarm set points: 1st 25 ppm; 2nd 50 ppm; TWA 25 ppm; STEL 200 ppm; Over 500 ppm. Types of alarms: gas alarms: 1st and 2nd (user adjustable), OVER alarm, STEL and TWA.
Trouble alarms: sensor connection, low battery circuit failure and calibration range error. Response time: T90 in 30 seconds. Accuracy: +/- 5 ppm (up to 150 ppm). Dimension and weight: 1.4 x 4.1 x 0.8 inches, 3.5 ounces (100 g). Operating temp. and humidity: -20°C ~ 50°C; humidity below 90% RH (non-condensing).