GA-12 – Hand-held gas analyser

GA-12 is madur’s smallest gas analyser - hand-held, equipped with up to 3 EC cells.
Small dimensions and light weight makes it very convenient for technicians that use analyser on a daily basis.
Rich offer of equipment and add-ons makes it interesting for more demanding users.
Manufactured according to the principles of EN50379.


Main features

  • Equipped with 2 or 3 electrochemical cells (typical configuration: O2, CO, NO/NOx)
  • Works with an external portable printer via wireless communication (IR LED)
  • Up to 60 hours of work (version with replaceable alkaline batteries)
  • Fixed probe of two different lengths with inline filter and condensate trap
  • Differential pressure sensor - for measurements of chimney draft and flow velocity (with help of Pitot tube)
  • Cooperation with digital RH and temperature sensors
  • Measurements of gas and ambient temperatures
  • Results presented on LCD display (128x64) with backlight
  • Built-in large memory for results saving
  • Calculations of many additional parameters
  • Firmware for gas calibration

Two versions of power supply are possible:

  1. version with four replaceable AA batteries (alkaline, Ni-Cd or Ni-MH)
  2. version with built-in Li-ion rechargeable battery and aditional mains adapter for battery charging

GA-12 analyser in its carrying case


Ready to operate GA-12 analyser with accessories


Front panel view

Front panel view

Bottom view

View at the bottom panel

Top view

Top view

Example screenshots

Example screenshots

PC software example screenshots

Example screens

1. General parameters – Version A (with replaceable AA batteries)

Dimensions (W x H x D) (drawing #1 below) 245 x 116 x 47mm
Weight (analyser itself without batteries and accessories) 470g
Housing material ABS case, rubber protective boot (optional)
Protection grade IP20
Operating conditions T: 10°C ÷ 50°C, RH: 5% ÷ 90% (non-condensing)
Storing temperature -20°C ÷ +55°C
Power supply 4 x AA battery (alkaline or Ni-Cd or Ni-MH)
Operating time (new alkaline batteries) Up to 60 hours
Number of gas sensors 2 or 3 – see ordering guide
Memory for results for 64 measurement reports
Display Graphical LCD 128x64, with variable contrast and LED backlight
Gas pump Diaphragm, max 0.6 ÷ 0.9l/min.
Printer External thermal IR printer MCP 8850 with charger
Communication interface with PC computer RS-232C
Gas probe: length | hose length | temp. range (drawing #2 below) 150mm or 250mm | 2m | 300°C max
Gas filtering In-line filter included in the gas probe hose

2. GA-12 with built-in rechargeable Li-ion battery

Weight (analyser with a battery, without accessories) 510g
Power supply Built-in Li-ion battery (3.6V, 1600mAh)
Operating time (battery fully charged) Up to 16 hours
All other data is the same as in table 1

3. Measurements of gas components

Table below shows the combination of all sensors/ranges. Please mind that the maximum possible gas sensors number in a device is 3 – see ordering guide

Component Method Range | resolution Accuracy Time (T90) Conformity
O2 – Oxygen Electrochemical sensor 20.95% | 0.01% ± 0.2% abs. or 5% rel. 45 sec ISO 50379, CTM-030
O2 – Oxygen Electrochemical sensor 25.00% | 0.01% ± 0.2% abs. or 5% rel. 45 sec ISO 50379, CTM-030
CO – Carbon monoxide Electrochemical sensor 2 000ppm | 0.1ppm ± 5ppm abs. or 5% rel. 45 sec ISO 50379, CTM-030
CO – Carbon monoxide Electrochemical sensor 4 000ppm | 1ppm ± 5ppm abs. or 5% rel. 45 sec ISO 50379, CTM-030
CO – Carbon monoxide Electrochemical sensor 20 000ppm | 1ppm ± 10ppm abs. or 5% rel. 50 sec ISO 50379, CTM-030
CO – Carbon monoxide Electrochemical sensor 10% | 0.001% ± 0.005% abs. or 5% rel. 45 sec ISO 50379, CTM-030
CO – Carbon monoxide Electrochemical,
with H2 compensation
4 000ppm | 1ppm ± 5ppm abs. or 5% rel. 45 sec ISO 50379, CTM-030
NO – Nitric oxide Electrochemical sensor 2 000ppm | 0.1ppm ± 5ppm abs. or 5% rel. 70 sec ISO 50379, CTM-030
NO2 – Nitrogen dioxide Electrochemical sensor 1 000ppm | 0.1ppm ± 5ppm abs. or 5% rel. 45 sec ISO 50379, CTM-030
SO2 – Sulphur dioxide Electrochemical sensor 2 000ppm | 0.1ppm ± 5ppm abs. or 5% rel. 45 sec ISO 50379
H2S – Hydrogen sulfide Electrochemical sensor 2 000ppm | 0.1ppm ± 5ppm abs. or 5% rel. 45 sec

4. Other measurements / calculated results

Variable Method Range | resolution Accuracy Time (T90)
Tgas – gas temperature K-type thermocouple -10 ÷ 1000°C | 0.1°C ± 2°C 10 sec
Tamb – boiler intake air temperature PT500 resistive sensor -10 ÷ 100°C | 0.1°C ± 2°C 10 sec
Differential pressure silicon piezoresistive pressure sensor -25hPa ÷ +25hPa | 1Pa (0.01hPa) ± 2Pa abs. or 5% rel. 10 sec
Gas flow velocity (optional) Indirect, with Pitot tube & pressure sensor 1 ÷ 50m/s | 0.1m/s 0.3m/s abs. or 5% rel. 10 sec
RH – relative humidity SHT11 capacitive polymer sensor (special probe needed) 5 ÷ 95% | 1% ± 5% abs. 30 sec
Lambda λ – excess air number calculated 1 ÷ 10 | 0.01 ± 5% rel. 10 sec
qA – stack loss calculated 0 ÷ 100% | 0.1% ± 5% rel. 10 sec
Eta η – combustion efficiency calculated 0 ÷ 120% | 0.1% ± 5% rel. 10 sec



Hereby tool helps to configure, in few simple steps, ready to measure analyser. It allows to select main structural components, like gas dryer, gas sensors, etc. Some elements, like probe pipes are to be selected separately. This mini-configurator, generates a list of madur codes that identifies the selected configuration. Customer may add own comments and requests. Device configuration has to be verified by pressing the Refresh button in the Order Summary section. Order summary can be send to our sale engineers for validation and in order to obtain price offer.

Presenting prices principles

Analyser’s standard equipment supplied along with the device.

  • Carrying case made of HDPE for analyser and accessories
  • 4xAA alkaline batteries OR built-in Li-Ion battery+mains adapter
  • 2.5m RS-232C communication cable with DB9 female connector
  • Software CD with programs and manuals

supplemental equipment - ordered separately, but essential to work with the analyser

Gas probe 150mm

Gas probe

Complete gas probe L=150mm, OD=8mm. Made of stainless steel, equipped with K-type thermocouple. Delivered with fastening cone, in-line filter and 2.0m gas-electric line with 4-pin male plug.

Ordering codes:
E-SON1200 (L=150mm)

Optional equipment, spare parts and accessories

Portable printer and printer paper

Portable printer

Portable printer (battery operated), communicates with the analyser via wireless HP-IR interface.
Allows to print measurements results instantly on the 58mm thermal paper. The printer is delivered together with 4 Ni-MH rechargeable batteries, mains adapter (for batteries charging) and single roll of paper.

Ordering codes:
Z12-PRINTER - printer
V-THP5701 - thermal paper roll

Magnetic holder

Magnetic holder

Modified battery cover with magnets installed in it. This magnetic holder allows to attach the analyser to the metal parts of the boiler, what makes the operation with the analyser even simpler. Replaces the standard battery cover. Delivered with fixing screw.

Ordering code:

Leatherette casing

Leatherette casing

Soft casing (just for the analyser) made from leatherette, protects the analyser during transport.

Ordering code:

Rubber protector

Rubber protector

Special rubber protector for the analyser’s casing. Protects the analyser against hits and blows.

Ordering code:

Ambient temperature sensor

Ambient temperature sensor

This ambient PT500 temperature sensor on a 3m cable is used for measurement of the boiler’s inlet air.

Ordering code:

Anchor cone for PT-500 ambient temperature sensor

Anchor cone for PT-500 ambient temperature sensor

This cone allows fitting the temperature sensor into holes with different diameter.

Ordering code:

Magnetic holder for PT500 sensor

Anchor cone for PT-500 ambient temperature sensor

This magnetic holder allows to safely hang the sensor on a metal surface.

Ordering code:

RH and ambient temperature probe


Probe for RH and ambient temperature measurements.
Not-suitable for inside stack measurements (working temperature up to 120°C).

Ordering code:

Pitot tube

Pitot tube

Pitot tube is used for indirect measurement of gas flow velocity (measurement with the analayser’s differential pressure sensor).
Few lengths of tubes are available. Pitot tube has 2m gas tubings to connect it with the analyser.

Ordering codes:

RS232C to USB converter


2.5m cable that allows to connect the analyser (its RS232C port) with USB port in PC computer (especially valuable when PC is not equipped with COM port).

Ordering code:

Bluetooth communication module

Bluetooth communication module

Module connected to the analyser’s RS232C port, allows to communicate with PC computer over Bluetooth protocol.

Ordering code:

AA alkaline batteries or Ni-MH AA rechargeable batteries


Alkaline batteries, 1.5V, size AA.

Ordering code:

Rechargeable batteries Ni-MH, 1.2V, size AA, 2000mAh (or better).

Ordering code:

Remember the rechargeable batteries need external charger (cannot be charged inside the analyser)!

Li-ion rechargeable battery

Li-ion rechargeable battery

Rechargeable batteries Li-ion, 3.6V, 1600mAh (or better).
Spare part for the B version analysers.

Ordering code:

Pressure test kit

Pressure test kit

Pressure test kit allows to perform leakage test of the pneumatic / gas installations.
Requires analyser’s differential pressure sensor to operate.

Ordering code:

In-line filter

In-line filter

In-line filter for all the types of GA-12 probes.
Spare part for gas probes.

Ordering code:

In-line filter insert 20um

In-line filter insert 20um

In-line filter insert for all the types of GA-12 probes.

Ordering code:

4-pin male plug 719 series or equivalent

4-pin male plug

4-pin plug for all the types of GA-12 probes.

Ordering code:

4-pin male plug 719 to 7-pin female socket adapter

socket adapter

4-pin plug to 7-pin female socket adapter. Enables use of all the types of GA-21plus probes with GA-12 analyser.

Ordering code:

Mains adapter for Li-ion battery charging

Mains adapter

For use only with the B-version of GA-12 (with built-in Li-ion battery). The mains plug has to be ordered separately

Ordering codes:
196B2001A - adapter without mains plug
196B2011A - plug EU (European)
196B2021A - plug US
196B2031A - plug UK
196B2051A - plug AUS (Australian)


Please write below the new quantity.

New value:


General information

madur purchase rules



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