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The HHAQ-108 is ideal for measuring levels of gaseous formaldehyde (HCHO) as part of a workplace indoor air quality assessment to determine the need for, or effectiveness of, a local exhaust ventilation (LEV) system.

The HHAQ-108 features an electrochemical sensor which measures real-time formaldehyde gas concentration. It also tracks, calculates and displays three cumulative formaldehyde gas metrics: 8-hour TWA (time-weighted average), 1-hour average, and 15-minute STEL (short-term exposure limit).

The UK Control of Substances Hazardous to Health (COSHH) Regulations 2002 impose a legal requirement for the workplace control of exposure to Formaldehyde, by reference to Table 1 of EH40/2005 Workplace Exposure Limits (WELs).

The STEL for Formaldehyde as listed in EH40^* is 2 ppm or 2.5 mg/m³. 

The device is also equipped with a tripod mount fitting for hands free monitoring.

Specifications

• Formaldehyde Range/Resolution: 0 to 5 ppm/0.01 ppm
• Formaldehyde Accuracy: ±(5% + 0.03 ppm)^*
• Formaldehyde Sensor Type Warm-up Time: Electrochemical/1 to 15 minutes
• Temperature Range: 0 to 50°C (0 to 122°F)
• Temperature Accuracy/Resolution: ±1°C (1.8°F)/0.1°
• RH Range/Accuracy: 10 to 90% RH/±5% of reading, typical
• Display Type/Size: Dual readout LCD/51 mm diagonal
• Auto Power-Off Trigger: 15 minutes of front-panel inactivity (can be disabled)
• Operating Temperature: 0 to 50°C @ 0 to 95% RH, non-condensing
• Dimensions: 210 L x 60 H x 25 mm D 
• Weight: 204 g (with battery)
• Power Source: 4 AAA batteries (included) or optional AC adaptor

^* Legal requirements and exposure limits will vary by location. Also Meets U.S. National Institute for Occupational Safety and Health’s (NIOSH’s) acceptance criteria.