CH4S Methanethiol/Methyl Mercaptan Gas Detector – WatchGas

The WatchGas SST1 configured for CH4S ( Methanethiol/Methyl Mercaptan ) is a compact, rugged single-gas detector purpose-built for continuous personal monitoring of this toxic gas, measuring 0–100 ppm with a fine 0.01 ppm resolution and a fast sub-10-second T90 response time. It comes pre-set with low and high alarms at 2 ppm and 5 ppm respectively, alongside STEL (1 ppm) and TWA (0.5 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 CH4S ( Methanethiol/Methyl Mercaptan ) 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: CH4S gas, 0–100 ppm range, with STEL (1 ppm) and TWA (0.5 ppm) exposure tracking
• Resolution: 0.01 ppm — fine-grained readout for precise low-level detection
• Response time: T90 <10 seconds — near-instant reaction to gas exposure
• Alarm setpoints: Low alarm at 2 ppm, High alarm at 5 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