The HHAQ-110 simultaneouslydetects Methane, CarbonMonoxide, Oxygen and HydrogenSulfide making it the ideal devicefor detecting gas leaks in mines,chemical plants, refineries andconstruction tunnels.
The HHAQ-110 displays thecurrent level of each gas as wellas the STEL (short term exposurelimit) and TWA (time weightedaverage). Concentration alarmsare programmable in three modes(audible, visual and vibrating). Thecatalytic/electrochemical sensoruses natural diffusion sampling(typical sensor life 2 years).
The HHAQ-110 is powered by arechargeable lithium-ion batteryand includes the charger.
Specifications Measurement Ranges:     CH4: 0 to 100% LEL (Lower Explosive Limit)     CO: 0 to 1000 ppm     O2: 0 to 30% by volume     H2S: 0 to 100 ppm Measurement Accuracy: ±2% offull-scale value Response Time: < 30 seconds to 90%of final value Alert Levels: 200 ppm STEL +35 ppm TWA for CO, 15 ppm STEL +10 ppm TWA for H2S High, Low Alarm Ranges:     CH4: 25 to 80% LEL with 50% LEL default, 10 to 25% LEL with 20% LEL default     CO: 100 to 500 ppm with 200 ppm default, 25 to 100 ppm with 35 ppm default     O2: 22.5 to 24% by volume with 23.5% default, 16 to 19.5% by volume with 23.5% default     H2S: 15 to 30 ppm with 15 ppm default, 5 to 15 ppm with 10 ppm defaults Sensor Type: Catalytic (CH4), electrochemical (CO, O2, H2S) LCD Size: 42 mm (1 5/8") diagonalOperating Life with Fully Charged Battery: 8 hours undernon-alarm conditions Operating Temperature: -20 to 50°C(4 to 122°F) @ 5 to 95% RH, non-condensing Dimensions: 116 L x 66 W x 31 mm D(4.6 x 2.6 x 1.2") Weight (with Battery): 200 g (7 oz)