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POLI MP400 1 to 5 Multi Gas Diffusion Detector

The POLI Diffusion Gas Detector MP400 is a basic 4 gas detector for worker safety in hazardous locations, with oxygen, combustible, carbon monoxide and hydrogen sulfide sensors. Hydrogen Cyanide and Sulfur Dioxide sensors are also available.

For pricing, please call 1-800-952-3293 or email



The POLI Diffusion Gas Detector MP400 is a basic 4 or 5  gas detector for worker safety in hazardous locations, with oxygen, combustible, carbon monoxide and hydrogen sulfide sensors. It is designed to be extremely rugged with a robust housing and gas sampling by diffusion for no moving parts. The simple, 2 button operation results in ultimate ease of use and significantly reduce time spent training the user. The rechargeable Li-Ion battery pack lasts 16 hour or more in typical use and the Man-Down alarm feature notifies nearby workers if the user becomes incapacitated.


  • Diffusion sampling
  • Battery operation of 16 hours
  • Durable double shot outer case
  • 360° LED alarm bar
  • Man-Down alarm
  • USB micro charger and communications cable
  • Flips screen
  • Integrated calibration cup
  • Smart sensor carry ID and calibration
  • 6 months continuous datalogging
  • Modular design


Detector Electrochemical for Oxygen, Carbon Monoxide & Hydrogen Sulfide
Pellistor for Combustible
Battery Rechargeable Lithium-ion
Operating Periods Diffusion: Up to 16 hours
Graphic Display 128 x 128 graphical LCD, 1.77 x 1.73″
LED backlight for enhanced display
Automatic screen “flip” feature
Keypad Two button operation
Direct Readout Real time reading of gas concentrations
Battery status
Visual compliance indicator
Datalogging on/off
STEL, TWA, peak and minimum values
Man-Down alarm on/off
Alarm Audible: 90 dB @ 30 cm
Visual: Flashing bright red LEDs
On-screen indication of alarm conditions
Man-Down alarm
EMI/RFI EMC directive: 2004/108/EC
IP Rating IP-67
Data Logging Continuous datalogging, 6 months for 4 sensors at 1 minute intervals, 24 hours/day and 7 days/week
Communication & Charging Charging, data download, instrument setup and firmware upgrades on PC or laptop via PC Comm, cradle, travel charger or CaliCase
Temperature -4* to 122°F
Humidity 0-95% rH, non-condensing
Size 5.74″ x 3.31″ x 1.65″
Weight 13.5 ounces
Approvals Class I, Div 1, Groups A, B, C, D

Sensor Specifications

Combustible Gas (LEL%)
0-100% LEL
Carbon Monoxide
0-1,000 ppm
1 ppm
0-1,000 ppm, Low H2
1 ppm
Hydrogen Sulfide
0.1-100 ppm
0.1 ppm
0-1,000 ppm
1 ppm
0.1-2,000 ppm
0.1 ppm
Hydrocarbons NDIR (Vol%)
0-100% Vol
0.1% Vol
0-5% Vol, 1-200% LEL
0.1% Vol
Carbon Dioxide
50-50,000 ppm
100 ppm
Carbon Monoxide/Hydrogen Sulfide
CO: 1-500 ppm
H2S: 0.1-200 ppm
CO: 1 ppm
H2S 0.1 ppm
Sulfur Dioxide/Hydrogen Sulfide
SO2: 0.1-20 ppm
H2S: 0.1-100 ppm
SO2: 0.1 ppm
H2S: 0.1 ppm
0-100 ppm
1 ppm
0-500 ppm
1 ppm
0.1-50 ppm
0.1 ppm
Chlorine Dioxide
0.01-1 ppm
0.01 ppm
1-1,000 ppm
10 ppm
Hydrogen Chloride
0.1-15 ppm
0.1 ppm
Hydrogen Fluoride
0.1-20 ppm
0.1 ppm
Hydrogen Cyanide
0.1-100 ppm
1 ppm
Nitric Oxide
1-250 ppm
1 ppm
Nitrogen Dioxide
0.1-20 ppm
0.1 ppm
0.01-20 ppm
0.01 ppm
Sulfur Dioxide
0.1-20 ppm
0.1 ppm
0.1-100 ppm
0.1 ppm
Nitrous Oxide
100-1,000 ppm
10 ppm
Methyl Mercaptan
0.1-10 ppm
0.1 ppm
Ethylene Oxide
1-100 ppm
0.1 ppm

Ordering Information

Each POLI Multi Gas Detection instrument includes monitor and sensors as specified, SS alligator clip, rechargeable Li-Ion battery, calibration hose, instructions and quick reference guide. For pricing, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email

Catalog No.
POLI 4 Gas Detector, LEL, O2, CO, & H2S Sensors MPA2-81A601-02040


POLI Diffusion Gas Detector literature

Tech Note 3 – Calibration Frequency

Tech Note 4 – Sensor Technical Data Summaries

Tech Note 5 – Gas Detectors for Firefighters and Hazmat Teams

Product Enquiry

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