English (UK)
  • Deutsch
  • English (UK)

MF420 Ex 2.1 200x200
  • H2
  • CH4
  • CHx
  • LPG
  • CHO
  • nHp
  • CO
  • O2


The probe MF420-Ex 2.1 is approved for operation in hazardous areas of zone 1 and zone 2 and has an EU-type examination certificate in accordance to Directive 2014/34/EU (ATEX) with the following certificate and labeling:

IBExU 12 ATEX 1080 X
Ex II 2G Ex db eb IIC T6/T4 Gb
Ambient temperature range:
T4: -40°C to +60°C / T6: -40°C to +50°C

The modular design of the sensor allows to equip it with a catalytic sensor (Pellistor) for determining the concentration of explosive gases and vapors, or with an electrochemical sensor for toxic gases depending on the variant. The concentration is output from the 4 - 20 mA interface, for further processing.


Measuring ranges

The measuring ranges depend on the measured gas or vapor. For a table of ranges please refer to the product assortment. Other gases, vapors, and concentrations are also possible on request.


The device has been approved in accordance with the directive 2014/34/EU (ATEX) with the type examination certificate IBExU 12 ATEX 1080 X. It was tested according to the standards EN 61000-6-2 and EN 61000-6-3 and EN 50270 and complies with the EMC Directive 2014/30/EU.

Maintenance and service

The device is delivered already calibrated. The maintenance cycle must / should correspond to the given safety requirements. We recommend at least a semi-annual inspection of the equipment by qualified personnel. You can also use our service.

For more details, please refer to the technical data or ask our contact person.

Product NameProduct FeaturesProduct Code
MF420-Ex-2.1 Hydrogen, LEL 4 vol%
Measuring range 0 - 100% LEL
MF420-Ex-2.1 Methane, LEL 4.4 vol%
Measuring range 0 - 100% LEL
MF420-Ex-2.1 Propane, LEL 1.7 vol%
Measuring range 0 - 100% LEL
MF420-Ex-2.1 n-Butane, LEL 1,4 vol%
Measuring range 0 - 100% LEL
MF420-Ex-2.1 LPG (50%-50%), LEL 1.5 vol%
Measuring range 0 - 100% LEL
MF420-Ex-2.1 Ethanol, LEL 3.1 vol%
Measuring range 0 - 100% LEL
MF420-Ex-2.1 Methanol, LEL 6 vol%
Measuring range 0 - 100% LEL
MF420-Ex-2.1 i-Propanol, LEL 2 vol%
Measuring range 0 - 100% LEL
MF420-Ex-2.1 Xylol, LEL 1 vol%
Measuring range 0 - 100% LEL
MF420-Ex-2.1 n-Heptane, LEL 0.8 vol%
Measuring range 0 - 100% LEL
MF420-Ex-2.1 Acetylene, LEL 2.3 vol%
Measuring range 0 - 100% LEL
MF420-Ex-2.1 Carbon monoxide
Measuring range 0 - 300 ppm
MF420-Ex-2.1 Oxygen
Measuring range 0 - 25 vol%

Other gases and vapors on request.

Principle of Measurement catalytic (pellistor) or electro chemical sensor
Power Supply Voltage 18 V to 30 V DC
Current approx. 105 mA at 24 V
Ambient Temperature -40°C to +60°C
-40°C to +50°C
for temperature class T4
for temperature class T6
Air pressure 700 hPa to 1300 hPa  
Permissible Humidity 10 to 95% relative humidity non condensing
Output 4 - 20 mA max. Load 500 Ω (Error status at I
Housing Alloy composition / Stainless steel  
Protection class IP 65
Weight ca. 1100 g
Dimensions (D x H) ca. ∅84 x H78 mm
Connecting Cable 3-wire shielded cable Recommended cable cross-section minimum 1.5 mm2
Certifiction EC-type examination certificate in accordance with the directive 94/9/EC (ATEX) IBExU 12 ATEX 1080 X
Ex II 2G Ex db eb IIC T6/T4 Gb

Pin Assignment:

Product NameProduct FeaturesProduct Code
Replacement Sensor Set Consists of:
- Replacement sensor
- Seal
on request
Calibration Set Consists of:
- Test gas cap
- O-Ring
on request