Advanced Multi-Gas Detector

The WatchGas POLI in pumped version is an advanced instrument with an integrated pump that enables a full range of sensors for a variety of applications, including confined space entry. The POLI in diffuse detection version is a multigas detector that is ideally suited for worker safety monitoring in hazardous locations.

Smart sensors contain calibration and ID information, so you can change them on the spot. This makes the POLI is the ideal device for an emergency response to incidents involving hazmat response. The construction of the POLI is very robust and the operation is intuitive with two buttons and a large LCD screen. The man-down alarm function, which is unique in this segment of the market, warns nearby personnel when the user has stopped moving.

  • Available in diffusion- or pumped version;
  • Man Down Alarm with real-time remote wireless notification;
  • IP-65 (pumped versions) and IP-67 (diffusion versions);
  • With water and dust resistant case;
  • Real-time gas concentration readings and alarm status enabled by state-of-the-art wireless technology;
  • Large graphical display icon-driven user interface through intuitive, simple-to-operate two-button user interface;
  • Easy access to pump, sensor, filter, and battery;
  • Over 30 interchangeable sensor options, including PID for VOC, NDIR and catalytic for combustibles, and NDIR for CO2;
  • Intelligent sensors store calibration data, so they can be swapped in the field.


Size 140mm x 84mm x 42mm
Weight 435g (pumped), 385g (diffusion)
Sensor Technology Over 30 interchangeable and field-replaceable sensors including PID for VOC's, EC for toxic and O2, Pellistor for LEL and NDIR for LEL, vol% and CO2
Temperature -20°C ~ +50°C
Humidity 5% ~ 95% (non-condensing)
Alarm Type High alarm, low alarm, TWA alarm, STEL alarm, Man-Down alarm with pre-alarm, on-screen indication of alarm conditions
Alarm Signal Acoustic: 95dB @ 30cm
Visual: Flashing bright red LEDs
Panic Alarm Yes
Display 128 x 128 graphical 45 x 44 mm LCD Display, with LED backlight for enhanced readability. Automatic screen 'flip' feature
Calibration 2-point calibration, zero and span. Power-on zero calibration with user confirmation. MonoDock allows automatic bump test and calibration.
Data Log Continuous datalogging (6 months for 4 sensors at 1-minute intervals, 24 hours/day and 7 days/week)
Battery Operating Time Diffusive with LEL Cat: 16h
Pumped with LEL Cat: 12h
Diffusive with LEL IR: 60h
Pumped with LEL IR: 28h
Only EC sensors: 60h
Measurement Built-in pump (sample from up to 30m) or diffusion
Housing Polycarbonate and rubber
Response time T90 Sensors: 15 sec (LEL/CO/H2S/O2)
Other gases may vary (TN4: Sensor Technical Data Summeries)

Hoses: 10m: 60s/ 20m: 90s/ 30m: 120s
Accuracy Deviation 2-3%
IP-Rating IP65 (pump versions)
IP67 (diffusion versions)
EMI/RFI Compliant with EMC 2014/30/EU
Safety Certifications UL: Class I, Div 1, Group A,B,C,D, T4, -20°C ≤ Tamb ≤ +50°C
IECEX: Ex ia IIC T4 Ga
ATEX: II 1G Ex ia IIC T4 Ga
CE: Conformité Européenne
Warranty 2 years on instruments
2 years on sensors for pelistor LEL, LEL/%vol, O2, CO, CO2, H2S, SO2, HCN, NO, NO2 and PH3
1 year on other sensors

Model Detectable Gas Ranges Resolution
PID 0-200ppm


Also Lead-Free O2 and Lead-Wool O2

0-30%vol 0.1%vol
Combustibles (LEL%) 0-100%LEL 1%LEL / 0.1%LEL
NDIR Methane (LEL%) 0-100%LEL 0-100%LEL
NDIR Methane (Vol%) 0-100%Vol 0.1%Vol
Dual-Range LEL%/Vol% 0-100%Vol 1%LEL or 0.1Vol%
0-100 %LEL
1 %LEL
CO2 (ATEX Zone 1) 0-50000ppm 100ppm
CO 0-1000ppm 1ppm
H2S 0-100ppm
CO + H2S CO: 0-500 ppm
H2S: 0-200ppm
CO: 1ppm
H2S: 0.1ppm
SO2 + H2S SO2: 0-20ppm
H2S: 0-100ppm
SO2: 0.1ppm
H2S: 0.1ppm 
SO2 0-20ppm
Cl2 0-50ppm 0.1ppm
ClO2 0-1ppm 0.01ppm
NO 0-250ppm 1ppm
NO2 0-20ppm 0.1ppm
H2 0-1000ppm 1ppm
PH3 0-20ppm
ETO 0-100pm 0.1ppm
NH3 0-100ppm
HF (diffusion only) 0-20ppm 0.1ppm
HCl 0-15ppm 0.1ppm
HCN 0-100ppm 0.1ppm
CH3SH 0-10ppm 0.1ppm
C2H4O 0-20ppm 0.1ppm
THT 0-40ppm 0.1ppm

*Check datasheet for mg/m3 detectable gas ranges and resolutions.

Please advise the Order Information datasheet of the POLI or contact us for more information.