Small in size, yet very skilful analyser – it has the best capabilities/price ratio. Sensonic CGM is our alternative for large, intricate CEMS systems, as it does not fall behind them concerning functionality and abilities, and is far ahead in terms of expenses. It has modular construction, and many add-ons, that makes it easy to adjust to a very specific, individual application. Powerful PC software allows to adjust many aspects of the work with the analyser very individually (work schedule, analogue outputs' behaviour, data presentations, and more...)



  • Standard configuration consists up to 4 sensors (NDIR and/or electrochemical).
  • Up to 8 sensors in an extreme, unique configuration
  • NEW option: Large display with backlight, 4 lines x 20 characters
  • Different types of gas dryers to fit the customers needs
  • Compact, Split and Twin split configurations
  • Data-logger with SD card for results’ collection
  • Analogue outputs (both current and voltage) to control external devices
  • Digital and analogue inputs to pass signals from external devices, to trigger Sensonic CGM actions
  • Communication with PC via different interfaces (USB, LAN, RS485 and MODBUS)
  • Different work modes to select from (continuous measurements, work with scheduler, measurements triggered with digital input, “work in-turns” - allows to measure from two different sources, and more...)
  • Powerful PC program to adjust the analyser's settings and to view the results
  • Rich offer of add-ons and accessories
  • NEW option: Possibility to work with heated hoses. Standard lengths: 3m, 5m, 8m for 115VAC and 230VAC supply. Other hoses upon request

Compact configuration - analyser with gas dryer on a common mounting plate, all installed near the measurement place.
Split configuration - analyser and gas dryer are installed on separate mounting plates, each equipped with its own power supply module. Gas dryer is installed near the measurement place, analyser can be installed in a distance from the dryer (in the operation convenient place). Analyser can be far away from the dryer, as the gas in the between connection is suitably prepared for measurement.
Twin split configuration - analyser and two gas dryers, each on its own mounting plate, each equipped with a power supply module. Allows to perform measurements from two different locations (each dryer is installed near the measurement place). Sensonic CGM measures in turns - one cycle per location.

Gas and electric connectors (analyser’s bottom view)

The second (additional) gas channel is enabled for shorter time during the measurement phase. The additional gas channel is dedicated for the ”fragile” sensors, where they are protected against too long exposure to the gas. This way the life-time of the fragile sensors is prolonged. Bio-measurement is a typical application for the double gas channel configuration - then the primary gas channel holds sensors CO2, CH4, O2, and the additional gas channel holds the H2S sensor that is recognised as a fragile one.
Analyser designed to work with overpressure with a single gas channel. Configuration can be used in installation with slight overpressure (<1.8bar).

Tech specs

General parameters - analyser unit
Dimensions (W x H x D) 240 x 360 x 160 [mm]
Weight (depends on equipment) 4kg ÷ 5kg
Casing's material ABS
Mounting plate: dimensions (H x W) | material | weight 596mm x 450mm | aluminium | 1.9kg
Operating conditions T: 10°C ÷ 50°C, RH: 5% ÷ 90% (non-condensing)
Storing temperature 0°C ÷ 55°C
Power consumption (analyser unit only) 30W max
Data-logger: type | size | number of results SD flash card | max 4GB | practically unlimited
Display: type | parameters Backlit LCD | 20 characters x 4 lines
Gas pump: type | max gas flow | standard gas flow Diaphragm | max 2l/min | 1.5l/min (90l/h) - with automatic flow control
Current analogue outputs 4 outputs 0mA ÷ 20mA or 4mA ÷ 20mA
Voltage analogue outputs 4 outputs 0V ÷ 5V or 0V ÷ 10V
Digital inputs 2 inputs, TTL levels, floating = high level
Digital outputs 1 open collector output + 2 SPDTrelays (optional)
Computer communication interface B type USB socket

General parameters - power supply unit
Dimensions (W x H x D) 360 x 130 x 56 [mm]
Weight (depends on equipment) 1.4kg
Casing's material aluminium
Mounting plate Power supply is mounted on common plate with analyser unit
Operating conditions T: +10°C ÷ +50°C, RH: 5% ÷ 90% (non-condensing)
Storing temperature -20°C ÷ +55°C
Input voltage 100 ÷ 240V AC 50/60Hz
Output voltage 24V DC / 6.3A | 150W
Output current 6.3A max
Mains fuse 6A
Cable pass 2 pcs PG-9

Gas dryer - MD2 gas dryer
Dimensions (W x H x D) 211 x 74 x 82 [mm]
Weight 450g
Drying method Water condensation by rapid cooling down
Cooler type Based on Peltier cooling element with fan (7VDC supply)
Cooling temperature Down to +4°C electronically stabilised. Dew point of outlet gas 8°C below the temperature of inlet gas.
Ready to operate after 10 minutes
Operating conditions T: 0°C ÷ 35°C, RH: 5% ÷ 90% (non-condensing)
Storing temperature -20°C ÷ +60°C
Maximum gas flow for efficient drying 40l/h
Gas filter Integrated, with condensate reservoir and replaceable insert
Filter insert: length | ID | OD | material | pore size 32mm | 15mm | 20mm | PE | 5µm
Condensate removal With peristaltic pump installed in analyser's body
Peristaltic pump capacity 38ml/min
Power supply Via Sensonic CGM (through 15-pin D-SUB connector)
Power consumption 9W

Gas dryer - MD3 gas dryer
Dimensions (W x H x D) Without filters: 110 x 205 x 160 [mm]
With Filters: 145 x 240 x 160 [mm]
Weight 1790g (single filter version)
Drying method Water condensation by rapid cooling down
Cooler type Based on Peltier cooling element with fan (12VDC supply)
Cooling temperature Constant, about +1°C, output gas dewpoint about +4°C
Ready to operate after 5 minutes
Operating conditions T: 0°C ÷ 50°C, RH: 5% ÷ 90% (non-condensing)
Storing temperature -20°C ÷ 60°C
Maximum gas flow for efficient drying 100l/h
Gas filters: quantity | material 1 (optionally 2) | PA – body, PC – cover, viton – sealing
Filter insert: length | ID | OD | material | pore size 42mm | 26mm | 32mm | glass fibre | 2µm
Power supply Standard: via Sensonic CGM power supply (through 3-wire power cable)
Standalone version via external supply module: 85V ÷ 264V AC / 24V DC
Condensate removal With built-in peristaltic pump
Peristaltic pump capacity 38ml/min

Measurements of gas components
The analyser can be equipped with sensors from below list

Compounds Range
O2 – (EC, PP) 20.95%, 25%, 100%
CO –(EC) 4000ppm, 20 000ppm, 10%
CO – (EC, H2 comp) 4000ppm
CO – (NDIR) 10%, 50%, 100%
CO2 – (NDIR) 25%, 50%, 100%
CxHy – (NDIR) 5%, 25%, 100%
NO – (EC) 5000ppm
NO2 – (EC) 1000ppm
SO2 – (EC) 5000ppm
H2S – (EC) 1000ppm
H2 – (EC) 20 000ppm
H2 – (TCD) 10%, 25%, 50%, 100%
N2O – (NDIR) 2000ppm
CHF3 – (NDIR) 2.5%
CL2 - (EC) 250ppm
HCl - (EC) 50ppm
PID - (VOC) 100ppm, 1000ppm, 5%, 10%

EC - Electrochemical sensor
PP - Partial pressure
NDIR - Non dispersive infrared sensor
PID - Photo Ionization Detector
VOC - Volatile compounds
TCD - Thermal Conductivity Detector

Other measurements / calculated results

Method Range
Tgas – gas temperature K-type thermocouple -50 ÷ 1000°C | 0.1°C
Tgas – gas temperature S-type thermocouple -50 ÷ 1500°C | 0.1°C
Tamb – boiler intake air temperature PT500 resistive sensor -50 ÷ 100°C | 0.1°C
Differential pressure Silicon piezoresistive pressure sensor -25hPa ÷ +25hPa | 1Pa (0.01hPa)
Gas flow velocity Indirect, with Pitot tube & pressure sensor 1 ÷ 50m/s | 0.1m/s
Lambda λ – excess air number Calculated 1 ÷ 10 | 0.01
qA – stack loss Calculated 0 ÷ 100% | 0.1%
Eta η – combustion efficiency Calculated 0 ÷ 100% | 0.1%


Drawing #1
Sensonic CGM analyser in compact configuration with MD2 gas dryer - external view
Drawing #2
Sensonic CGM analyser in compact configuration with MD3 gas dryer - external view
Drawing #3
Sensonic CGM analyser in split or twin split configuration - external view of analyser unit
Drawing #4
Sensonic CGM analyser in split or twin split configuration - external view of gas dryer unit
Drawing #5
Gas and electric connectors panel of the Sensonic CGM analyser - bottom view
Drawing #6
Sensonic CGM analyser - main unit dimensions
Drawing #7
Sensonic CGM - MD2 dryer
Drawing #8
Sensonic CGM probe connector, Binder 680 series, 7-pin female (512O0710C)
Drawing #9
Sensonic CGM dryer connector (for the MD2 dryer only) - DB 15-pin,female (512F2151F.M)
Drawing #10
Sensonic CGM USB connector, type B
Drawing #11
Sensonic CGM waste gas fitting - pressureless version (615A0017D.M)
Drawing #12
Glass fibre filter insert, ID=26mm (614Z0010B) (for the MD3 dryer only)
Drawing #13
Hydrophobic filter 1µm (614Z0009A)
Drawing #14
Sensonic CGM RS485 socket
Drawing #15
Sensonic CGM MODBUS socket


Analyser's standard equipment supplied along with the device
  • Sensonic CGM gas analyser on a mounting plate
  • Power supply unit that converts mains supply 115VAC or 230VAC to 24VDC for Sensonic CGM with power plug
  • USB communication cable (5m)
  • 8 analogue outputs (4x current, 4x voltage)
  • 2 digital inputs for triggering Sensonic CGM behavior
  • 7-pin connector for Tgas probe (thermocouple connection)
  • Software CD with PC programmes and user guides
  • 4 wall plugs to attach mounting plate
  • condensate bag for water collection
  • ON/OFF switch
Optional equipment for currently manufactured Sensonic CGM analyser
MD2 gas dryer
MD3 gas dryer
MD3 gas dryer with power supply
Stationary gas probe
Pitot tube
Heated filter
USB communication cable
Ethernet / WiFi communication interfaces

Optional equipment for older versions of Sensonic CGM analyser
RS-232C to USB converter
Bluetooth communication module