NH3 Ammonia Gas Detector – WatchGas

The WatchGas SST1 configured for NH3 (Ammonia) is a compact, rugged single-gas detector purpose-built for continuous personal monitoring of this toxic gas, measuring 0–100 ppm with a 0.5 ppm resolution and a T90 response time under 130 seconds. It comes pre-set with low and high alarms at 25 ppm and 50 ppm respectively, alongside STEL (35 ppm) and TWA (25 ppm) exposure limits to help protect workers against both acute and cumulative exposure. Housed in an IP65/68-rated, replaceable-battery and replaceable-sensor design, it’s built for demanding industrial environments where reliable, long-term NH3 (Ammonia) detection is critical.

Key Features:

• Dimensions: 83 x 49 x 20 mm (3.3 x 1.9 x 0.8 in)
• Weight: 88 g (3.1 oz)
• Alarm type: 95 dB audible alarm (industry-standard loudness at 30 cm) paired with visual alerts on the large LCD display, covering Low, High, STEL, and TWA alarm levels
• Detects/measures: NH3 gas, 0–100 ppm range, with STEL (35 ppm) and TWA (25 ppm) exposure tracking
• Resolution: 0.5 ppm
• Response time: T90 <130 seconds
• Alarm setpoints: Low alarm at 25 ppm, High alarm at 50 ppm
• Durability: IP65/68-rated housing, built for harsh industrial environments
• Serviceability: Replaceable battery and replaceable sensor module, extending the unit’s usable life
• Connectivity/management: NFC “tap and go” for fleet management, event logging (last 100 events), and configuration via the WatchGas Device Link App or SST Dock

Standards:

• ATEX, IECEX, UKEX : II 1 G Ex ia IIC T4 Ga I M1 Ex ia I Ma
• AS/NZS 60079 – Explosive atmospheres, Part 14: Design selection, erection and initial inspection