Fixed analyzer 

Fixed analyzer specialized in methane (CH4), carbon dioxide (CO2), carbon monoxide (CO) and oxygen (O2) measurements in biogas (landfill gas, biodigestors, etc...).

Measurement fields

  • Methane: 0 - 70 %
  • Oxygen: 0 - 25 %
  • Carbon dioxide: 0 - 50 %
  • Carbon monoxide: 0 - 9.500 ppm
  • Hydrogen sulphide (additional sensor / range 0 - 500 ppm)
  • Ammonia (additional sensor / range 0 - 1.000 ppm)

Options avaible
ABE_300:  Refrigerator 
It cools the gas to eliminate condensation

ABE_550:  Flow sensor
It allows the visualization of the biogas flow value

ABE_551:  Pair of radio transmitters
They allow data transfer between the PC and the analyzer up to a distance of 1.000 meters

ABE_552:  Temperature sensor
It is used to stabilize the temperature of the gas analyzed

ABE_553:  Software for Microsoft Windows 7 environment
For the configuration of the analyzer and the transfer of data read to Microsoft Excel or text files

ABE_554:  Absolute pressure sensor
It allows the visualization of the pressure in the measuring chamber, used to compensate the measurement of the gas analyzed

ABE_556:  Condensation presence sensor in the circuit
It generates a critical alarm to protect the sensors

ABE_557:  Suction pump for biogas managed directly by the analyzer

ABE_558:  Scan the analysis on multiple lines

ABE_560:  Option for automatic calibration of the analyzer
Each calibration time can be set during configuration (a sample gas cylinder is required)

Technical specifications

Operating Temperature   - 5 ° C / 50 ° C

Weight   3 kg

Dimensions   300 * 220 * 75 mm



Large LCD display 1/4 VGA (320 * 240 pixels) in reverse display (luminous writing), blue.

High level of brightness, possibility to vary the contrast.

It allows the simultaneous display of all the measurements made in numerical form and the possibility of displaying the measurements also in graphic form (trend).


Numerical membrane keyboard plus special functions (raised keys, the pressure squeezes a stainless steel bubble producing the sensation of the key).

Allows local management of all the functionalities of the instrument.

Analog outputs:

The board has 4 analog outputs driven by a converter (DAC) with a resolution of 16 Bit.

All channels are galvanically isolated one by one, eliminating any common mode problems even when connected to different systems.

The standard configuration includes the following links:

  1. Signal for oxygen 4 - 20 mA 0 - 25 % configurable
  2. Signal for methane 4 - 20 mA 0 - 100 % configurable
  3. Signal for 4 - 20 mA carbon dioxide 0 - 100 % configurable
  4. Signal for carbon monoxide 4 - 20 mA 0 - 100 % configurable

Digital inputs:

Eight opto-isolated digital inputs to read on which line the analysis is performed.

Digital outputs:

Eight digital outputs with relay interface, set to manage the valves that allow the scanning of several lines of analysis in the next scan, this option (ABE_558) allows the use of a single analyzer to analyze up to 8 different measurement points.

Analog inputs:

The board has 8 analog inputs managed by a converter (ADC) with a resolution of 24 Bit, and programmable gain between 1 and 64.

The first 2 channels have an input buffer made with an instrumentation amplifier with high isolation and gain, for differential measurements, the next six channels have a simple input buffer with negative input connected to the ground.

The standard configuration includes the following links:

1. Signal for oxygen
2. Free signal
3. Gas temperature signal
4. Condensation presence signal
5. Flow signal
6. Free signal
7. Free signal
8. Free signal

The sensor of methane, carbon dioxide and carbon monoxide communicates with the main board through a serial port.


Numerical window:

It is the main window on which all the variables read by the system are displayed in numerical form. The most important values (Methane, Oxygen, Carbon dioxide) are displayed with larger characters to be easily read even from a great distance.

Trend window:

All the variables managed by the analyzer are saved in its internal memory that manages up to 4.600 samples.
The stored data can be viewed as a trend. At the expiry of the sampling time (settable in the configuration phase between 1 and 9.999 minutes) the system gives the command to memorize.


  1. Expired calibration alarm (display only) is activated if the analyzer is not calibrated within the set time.
  2. Sensor alarm out of the maximum parameters (critical error) is caused if the sensors have left their correct operating range, the sensors must be replaced. The duplicate output signal is taken out of the operating range (less than 4 mA).
  3. High oxygen content alarm on the main line or on the n lines in the case of multiple line scanning (ABE_558).
  4. High condensation value alarm if the option (ABE_556) is active. In the event of an error, a critical alarm is generated and if the option (ABE_557) is present, the suction pump is switched off.