Easy to self-install, operate and maintain, the BIOGAS 300 is a cost effective fixed system biogas analyser for CH4 monitoring. Ideal for 500kw or reduced scale Anaerobic Digestion plants, from agricultural to food waste typical applications

About Geotech’s fixed gas analyser

  • The BIOGAS 300 provides single sample point monitoring for CH4
  • Ideal for small-scale anaerobic digestion sites
  • Modbus or 4-20mA data output
  • Simple to operate – push button operation
  • 0-100% CH4 measurement
  • Easy to read backlit display through transparent enclosure door
  • Last reading stored for on-screen viewing
  • IP65 rated ABS enclosure

Benefits of the BIOGAS 300

  1. No training required
  2. Zero service downtime
  3. Field proven equipment
  4. Simple user calibration
  5. Field proven technology
  6. Quick and easy self-installation
  7. Low cost of ownership
  8. Compact self-contained system
Need more information?

Please contact +6221-5467618, +6221-54212399 or email [email protected]


  • Simple to operate- push button operation
  • 0-100% CH4 measurement
  • Single sample point monitoring
  • Easy to read backlit display through transparent enclosure door
  • Last reading stored for on-screen viewing
  • IP65 rated ABS enclosure
  • Modbus data output

Technical Specifications

Number of sampling points 1
Gases monitored CH4
Sample pressure Non-pump version suitable for +10 to +50 mb sample points Pumped version suitable for-100 to +350 mb sample points
Operating temperature range 0°C to +50°C
Detects low flow and blockages
Reading obtained by user pressing sample button
Mains 110-240 Vac 50/60 Hz
Power 12W
Real time clock back up Lithium manganese dioxide coin cell
Gases measured CH4 By dual wavelength infrared cell with reference channel
Range CH4 0-100%
Typical accuracy- after calibration* CH4 ±2.0% vol
Response time, T90 CH4 120 seconds**
Flow 100ml/min typically
Maximum vacuum restart -100mb
Maximum sample pipe length 50 meters***
Output channels Modbus (as standard)

4-20mA current sink (optional)

4-20mA current source via a loop powered isolator (optional)

Weight max 10 kg
Size 500 x 400 x 200mm
Enclosure ABS, IP65 rated (with supplied wall mounting brackets)
Operation keys Tactile five button membrane keypad and sample button
Display Liquid crystal display with 20 x 2 characters and white LED backlight
Moisture removal filters User replaceable inline PTFE filter and coalescing filters
BS EN 61010-1: 2010 Safety requirements for electrical equipment for measurement, control, and laboratory use. Part 1: General requirements
BS EN 50270: 2006 Electromagnetic compatibility- electrical apparatus for the detection and measurement of combustible gases, toxic gases or oxygen

 *    Plus accuracy of calibration gas used.

**   T90 taken from point gas enters the system at ambient pressure and 100ml / min flow rate. Different applications will increase or decrease time accordingly.

*** Note: sample pipe length will affect response times.


BIOGAS300 datasheet