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PDM+ Single Gas Detector

Available in O2, CO, H2S, SO2, NH3 and H2.

Datalogger, EU-Version, ATEX



– Lightweighted & Compact

– Stores up to 30 events

– Low cost of ownership

– Sustainable

– IP-67

– Fast bump tests with Docking Station

– Visual, Acoustic and Vibration alarms


Product Detail

PDM+ is a single sustainable gas monitor designed to detect oxygen deficiency or the presence of toxic gas in the ambient environment. The PDM+ is sustainable, hence its battery and sensor can be replaced. When turned on, PDM+ continuously monitors ambient air for the presence of a specific gas and alerts the user to potentially unsafe exposure with LED, vibrating, and audible alarms. After use, the instrument can be turned off, making the battery last up to three years.


The PDM+ is easy to wear, the backside of the device has a strong metal clip to secure the monitor to a shirt, belt, or helmet. The PDM devices are compatible with WatchGas Docking Station and WatchGas IR Link. Both devices provide the function to download the data of the PDM+ single-gas monitor. The 30 most recent events will be stored on an internal event logger.


PDM+ can be calibrated or bump tested manually. The Docking Station will automatically calibrate four devices simultaneously, which reduces downtime and gas consumption.



Detectable Gas Ranges O2=0-30% Vol SO2=0-50ppm CO=0-500ppm NH3=0-100ppm H2S=0-100ppm  H2=0-1000ppm
Resolution O2=0.1% Vol SO2=0.1ppm CO=1ppm NH3=1ppm H2S=0.1ppm H2=1ppm
Output Specifications LCD display of current reading with alarm sounder and vibrator
Sensor Technology Electrochemical Cell
Power Supply DC 3.6V, 1.2Ah Lithium battery
Operating Temperature -40°C – 50°C
Operating Humidity 5% – 95% RH (Non-condensing)
Dimensions 54mm(W) x 91mm(H) x 32mm(D)
Weight 93g (Toxic), 104g (O2) (Battery, clip included)
Alarm 95dB
Enclosure Material Polycarbonate and rubber
IP Rating of Enclosure IP67
Certificates & Approval ATEX: II 1g Ex ia IIC T4 Ga, INMETRO: Ex ia IIC T4 Ga, IECEx: Ex ia IIC T4 Ga