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The PDM+ is a personal sustainable single gas detector designed to detect oxygen deficiency and the presence of toxic gas in the ambient environment.

  • TWA and STEL;
  • Sustainable;
  • IP-67;
  • Visual, acoustic and vibration alarms


The PDM+ is a personal sustainable single gas detector designed to detect Oxygen deficiency and the presence of toxic gas in the ambient environment. The PDM+ is sustainable and has TWA and STEL available, 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 if the gas concentration exceeds alarm set points. After use, the instrument can be turned off.

Product information

  • TWA and STEL
  • 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
Size 48mm (W) x 85mm (H) x 22mm (D)
Weight 93g (Toxic) / 104g (O2) (Battery clip included)
Sensor Technology Electrochemical Cell
Temperature -40°C ~+50°C (Toxic) / -35°C + 50°C (O2)
Humidity 5% ~ 95% RH (non-condensing)
Alarm Type High Alarm, Low Alarm, TWA Alarm, STEL Alarm, Over Range Alarm, Battery Low Alarm, Bumptest and Calibration due notification
Alarm Signal Acoustic: 95 dB @ 30cm Visual: Red flashing LEDs Vibration: Vibration
Display LCD Display
Calibration 2-point calibration, zero and span
Event Log 30 most recent events
Battery Lithium Primary Battery SB-AA02(P) 3.6V, 1.2Ah
Measurement Diffusion
Housing Polycarbonate and rubber
Accuracy Deviation 2-3%
IP-Rating IP67
Safety Certifications ATEX: II 1G Ex ia IICT4 Ga INMETRO: Ex ia IIC T4 Ga IECEX: Ex ia IIC T4 Ga CE: Conformite Europeenne
Warranty 24 months
Model Detectable Gas Ranges Resolution
PDM+ O2 0 - 30 %vol 0.1 %vol
PDM+ CO 0 - 500 ppm 1 ppm
PDM+ CO High Range 0 - 2000 ppm 1 ppm
PDM+ H2S 0 - 100 ppm 0.1 ppm
PDM+ H2 0 - 1000 ppm 1 ppm
PDM+ SO2 0 - 50 ppm 0.1 ppm
PDM+ NH3 0 - 100 ppm 1 ppm
PDM+ H2O2 NON-ATEX 0 - 99 ppm 0.1 ppm
PDM+ NO2 0 - 20 ppm 0.1 ppm
Manufacturer Watchgas
Lifetime: Sustainable
Article Nr. O2: 7192002
Article Nr. CO: 7192001
Article Nr. H2S: 7192000
Article Nr. SO2: 7192005
Article Nr. NH3: 7192003
Article Nr. H2: 7192006

PDM+ - Datasheet

PDM+ - Manual

PDM+ - Bump test

PDM+ Firmware V2.0.6 - Firmware downloads

PDM/PDM+ Multi Docking Station Firmware v1.10 - Firmware downloads

IR Link 1.7.3 Software PDM/PDM+/QGM - Software downloads