Electron impact mass spectrometer (EI-MS)


The PEMSense is an electron impact mass spectrometer (EI-MS) for rapid measurement of H2, N2, O2, H2O und CO2 on PEM fuel cells.

The analyzer is equipped with a dual sample gas inlet. On the anode side with a gas flow of < 60 ml/min and on the cathode or exhaust gas with a gas flow of < 3000 ml/min.

Typical applications

  • Fuel cell testing
  • Fuel cell development
V&F Picture Fuel Cell Brennstoffzellenpruefstand

Functional diagram

Function Principle V&F PEMSense

Success stories

Automotive industry

Measurable compounds

Permanent gas
DesignationChemical formula
Carbon monoxideCO
Carbon dioxideCO2
DesignationChemical formula
Noble gases
DesignationChemical formula
DesignationChemical formula


Technical Data
Technical DataEI-MS
Mass range1 - 100 amu
Resolution< 1 amu
Analysis time>= 32 msec
Measuring range0 – 100 Vol%
Response time cathodeT90 < 150 msec
Response time anodeT90 < 2 sec @ 4 bar(g)
Detection limit<= 100 ppm
Concentration drift<± 5% over 24h
Accuracy<± 3%
Precision<± 3%
Ambient temperature20°C - 35°C
Gas consumption cathode3000 ml/min
Gas consumption anode3- 60 ml/min
Gas inlet temperature50°C - 180°C adjustable
Gas inlet pressure cathode0,75 - 2 bar(a)
Gas inlet pressure anode0,75 - 6 bar(a)
Power consumption230 V/50 Hz or 115 V/60 Hz 800 W
Dimensions (WxHxD)534 x 743 x 639 mm
Weight62 kg

* depending on the components to be measured, system configuration and unit settings

** depending on the gas inlet system used

Reference clients (excerpt)

Reference AVLReference BoschReference OTH

Product brochures

For more details, specifications and further information, please refer to our product brochures.

Product brochures
V&F Picture Documents Product Flyer