Biogas 401

Multi-Channel Gas Analyser
Biogas 401


The Biogas analyser monitors either continuously or intermittently, the gas components contained in the Biogas and optionally, monitors the surrounding air to provide an early warning of dangerous, explosive and non-combustible gases and vapours.

Fields of Application

  • Monitoring of Biogas components
  • Warning of explosive gas mixtures
  • Warning of gases that endanger health
  • Warning of non-combustible gases
  • Dedicated for processes with high humidity levels
  • Multiple use for alarm values


  • Use of various types of measurement sensor
  • Direct indication of a warning state on an LC-display with coloured background lighting
  • Menu-assisted operation via 2 keys.
  • 3 alarm levels, independently adjustable from 5 to 100% of the test range selected.
  • 3 floating alarm outputs for driving external warning and control equipment.
  • Floating contact connections for fault and mains failure
  • Serial interface output, RS232 or RS485
  • 4-20mA current interface.
  • Various types of housing available, e.g. 19" rack system, wall-mounting cabinet
  • Up to 6 measurement channels per unit.
  • 1 card as Master, for controlling intermittent operation Biogas measurement time and test interval
  • Extreme service reliability.
  • Low current consumption.
  • Peltier cooling element with condensate pump
  • Flow-through adjustement
  • Gas components - filter system and conditioning
  • Water sensor for the detection of condensate break-through
  • Modular construction
  • Monitoring of more than one measuring point possible


External peltier gas cooler, Signal horn, warning light,
warning banner.

Other accessories will be offered, according to the measurement tasks required.

Measurable gases

Gas Formula
Hydrogen sulphide H2S
Methane CH4
Oxygen O2
Carbon dioxide CO2

Technical data

Sensors: Electrochemical sensors
Infrared sensors
Semiconductor sensors
Sensor input: 2-wire sensors (TOX 592) or
3-wire sensors (GTR 196)
for warning of explosive
gas mixtures
Sensor supply: 20 V DC / 200 mA max.
Test ranges:

CO2: 0-50 Vol.%
CH4: 0-100 Vol.%
O2: 0 - 21 Vol.%
(optionally continuous)

H2: 0-2 Vol. %
H2S: 0-50 ppm ... 0-5.000 ppm
(only discontinuous)

other ranges by request

Accuracy: ±3 % , f.s.d.
Ambient temperature: +41°F to +113°F
Installation: Wall-mounting
Output signal: Current output 4-20 mA
RS 232 or RS 485 interface
for each measurement channel:
3 alarm relays
1 fault relay
Relay rating: 230 V, 450 VA

Voltage supply:

115 V / 60 Hz
230 V / 50 Hz 
Power consumption: 100 VA
Dimensions (WxHxD): 23.6 x 18.8 x 18.9 inch (9HU)
Weight: approx. 132.3 lbs