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GA-21plus

GA-21plus portable gas analyzer

Advanced, yet still at a favourable price, equipped with up to 9 electrochemical and NDIR sensors.
Has a built-in pressure sensor, large internal memory for results and built-in ribbon printer for standard (non-thermal) paper.
Optional condensation “miniDryer” completes the offer for our best-selling portable device.

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Main features

  • Produced in two kinds of casing: soft and hard
  • Equipped with up to 7 electrochemical cells
  • Equipped with up to 2 NDIR sensors
  • Built-in 58mm ribbon graphic printer
  • Built-in rechargeable battery for up to 7 hours of operating
  • Peltier “miniDryer” with a peristaltic pump for condensate removal (optional)
  • Probe holder with a standard M30x1 fitting, fits all madur gas probes with the K-type thermocouples
  • Gas filter with condensate trap and replaceable insert
  • Differential pressure sensor - for measurements of chimney draft and flow velocity (with help of Pitot tube)
  • Soot measurement program
  • Measurements of gas and ambient temperatures
  • 2 additional inputs for extra temperature sensors
  • Analogue outputs (0/4-20mA or 0-10V) - optional
  • Built-in large memory for results, two formats of data savings
  • Calculations of many additional parameters
  • Firmware for gas calibrations

Two versions of analyser are available:

  1. Version in “soft” casing
  2. Version in “hard” casing

Soft vs hard casing

Casing

Complete and ready to operate GA-21plus analyser (hard case version)

Casing

Front panel view

Casing

Gas and electric connectors (full option)

Casing

Example screenshots

Casing

Example printouts and screenshot from PC program

Casing

1. General parameters

Version A (in soft casing)

Dimensions (W x H x D) 460 x 260 x 240mm
Weight (without accessories) 6.2 ÷ 7.2kg
Casing material Textile (polyester)
Protection grade IP20
Operating conditions T: 10°C ÷ 50°C, RH: 5% ÷ 90% (non-condensing)
Storing temperature 0°C ÷ +55°C
Power supply: input | max power consumption 90 ÷ 240VAC | 70W
Battery: type | work time | charging time Lead-acid, rechargeable 12V / 2.2Ah | 7h | 14h
Data memory: size | number of results 32kB | 30 reports + 10 banks (1024 sets of data)
Display Graphical LCD 128x128, with variable contrast and backlighting
Printer High-speed dot matrix, graphic printer for 57mm normal paper
Analogue outputs Two (0/4-20mA or 0-10V)
Gas pump | gas flow Diaphragm, max 2l/min (with automatic flow control) | 90l/h (1.5l/min)
Purging pump for CO sensor (optional) Diaphragm, max 1.5l/min
Communication interface with PC computer RS-232C
Gas filtering
  1. In-line filter included in the gas probe hose
  2. Built-in input filter with water-trap and replaceable insert

Version B (in hard casing)

Dimensions (W x H x D) 455 x 270 x 220mm
Weight (without accessories) 8.2 ÷ 9.2kg
Casing materials Wood & aluminium
All other data is the same as for the A version

2. Minidryer (optional)

Dimensions (W x H x D) 24 x 120 x 124mm
Weight 800g
Operating conditions T: 10°C ÷ 50°C, RH: 5% ÷ 90% (non-condensing)
Storing temperature -20°C ÷ +55°C
Power supply: input | max power consumption 15V DC (from analyzer's “Probe” socket) | 10W
Drying method Water condensation by rapid cooling down
Cooler type Based on Peltier element
Cooling temperature Down to +4°C electronically stabilised / Dew point of outlet gas at least 8°C below the ambient air temperature
Maximum gas flow for efficient drying 90l/h
Condensate pump Peristaltic, 38 ml/min.

3. Measurements of gas components

Table below shows the combination of all sensors/ranges.
Please mind that the maximum possible number of gas sensors in a device is 7 EC and 2 NDIR – see ordering guide.

Component Method Range | Resolution Accuracy Time(T90) Conformity
O2 – Oxygen Electrochemical sensor 20.95% | 0.01% ±0.01% abs. or 5% rel. 45 sec ISO 12039, CTM-030
O2 – Oxygen Electrochemical, partial pressure 20.95% | 0.01% ±0.01% abs. or 5% rel. 45 sec ISO 12039, CTM-030
O2 – Oxygen Electrochemical, partial pressure 25.00% | 0.01% ±0.01% abs. or 5% rel. 45 sec ISO 12039, CTM-030
O2 – Oxygen Electrochemical, partial pressure 100.00% | 0.1% ±0.1% abs. or 5% rel. 45 sec ISO 12039, CTM-030
CO – Carbon monoxide Electrochemical sensor 4 000ppm | 1ppm ±5ppm abs. or 5% rel. 45 sec ISO 12039, CTM-030
CO – Carbon monoxide Electrochemical sensor 20 000ppm | 1ppm ±5ppm abs. or 5% rel. 45 sec ISO 12039, CTM-030
CO – Carbon monoxide Electrochemical sensor 10% | 0.001% ± 0.005% abs. or 5% rel. 45 sec ISO 12039, CTM-030
CO – Carbon monoxide Electrochemical,
with H2 compensation
2 000ppm | 1ppm ±5ppm abs. or 5% rel. 45 sec ISO 12039, CTM-030
CO – Carbon monoxide NDIR 10% | 0.01% ±0.05% abs. or 5% rel. 45 sec EN 15058
CO – Carbon monoxide NDIR 100% | 0.1% ±0.5% abs. or 5% rel. 45 sec EN 15058
CO2 – Carbon dioxide NDIR 25% | 0.01% ±0.05% abs. or 5% rel. 45 sec ISO 12039
CO2 – Carbon dioxide NDIR 50% | 0.01% ±0.05% abs. or 5% rel. 45 sec ISO 12039
CO2 – Carbon dioxide NDIR 100% | 0.1% ±0.5% abs. or 5% rel. 45 sec ISO 12039
CH4 – Methane NDIR 5% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
CH4 – Methane NDIR 25% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
CH4 – Methane NDIR 100% | 0.1% ± 0.5% abs. or 5% rel. 45 sec
NO – Nitric oxide Electrochemical sensor 1 000ppm | 1ppm ±5ppm abs. or 5% rel. 45 sec EN 50379, CTM-022
NO – Nitric oxide Electrochemical sensor 5 000ppm | 1ppm ±5ppm abs. or 5% rel. 45 sec EN 50379, CTM-022
NO2 – Nitrogen dioxide Electrochemical sensor 1 000ppm | 1ppm ±5ppm abs. or 5% rel. 60 sec EN 50379, CTM-022
SO2 – Sulphur dioxide Electrochemical sensor 2 000ppm | 1ppm ±5ppm abs. or 5% rel. 45 sec EN 50379
SO2 – Sulphur dioxide Electrochemical sensor 5 000ppm | 1ppm ±5ppm abs. or 5% rel. 45 sec EN 50379
H2S – Hydrogen sulphide Electrochemical sensor 1 000ppm | 1ppm ±5ppm abs. or 5% rel. 70 sec
H2 – Hydrogen Electrochemical sensor 2 000ppm | 1ppm ±10ppm abs. or 5% rel. 50 sec
H2 – Hydrogen Electrochemical sensor 20 000ppm | 1ppm ±10ppm abs. or 5% rel. 70 sec
H2 – Hydrogen Thermal Conductivity Detector 10% | 0,1% ±0,5% abs. or 5% rel. 45 sec
H2 – Hydrogen Thermal Conductivity Detector 25% | 0,1% ±0,5% abs. or 5% rel. 45 sec
H2 – Hydrogen Thermal Conductivity Detector 50% | 0,1% ±0,5% abs. or 5% rel. 45 sec
H2 – Hydrogen Thermal Conductivity Detector 100% | 0,1% ±0,5% abs. or 5% rel. 45 sec
CL2 - Chlorine Electrochemical sensor 250ppm | 1ppm ±5ppm abs. or 5% rel. 60 sec
HCl - Hydrogen chloride Electrochemical sensor 100ppm | 1ppm ±5ppm abs. or 5% rel. 70 sec
N2O - Nitrous oxide NDIR 2 000ppm | 1ppm ±10ppm abs. or 5% rel. 45 sec ISO 21258
VOC – Volatile Organic compounds PID Photo Ionization Detector 100ppm | 1ppm ±5ppm abs. or 5% rel. 120 sec Method 21
VOC – Volatile Organic compounds PID Photo Ionization Detector 1000ppm | 1ppm ±5ppm abs. or 5% rel. 120 sec Method 21

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
Tgas – gas temperature S-type thermocouple -10 ÷ 1500°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
T1 – external temperature K-type thermocouple -10 ÷ 1000°C | 0.1°C ±2°C 10 sec
S-type thermocouple -10 ÷ 1500°C | 0.1°C
T2 – external temperature PT500 resistive sensor -10 ÷ 100°C | 0.1°C ±2°C 10 sec
T3 – external temperature K-type thermocouple -10 ÷ 1000°C | 0.1°C ±2°C 10 sec
T3 – external temperature S-type thermocouple -10 ÷ 1500°C | 0.1°C ±2°C 10 sec
T4 – external temperature PT500 resistive sensor -10 ÷ 100°C | 0.1°C 0.3m/s abs. or 5% rel. 10 sec
Differential pressure Silicon piezoresistive pressure sensor -25hPa ÷ +25hPa | 10Pa (0.01hPa) ±2Pa abs. or 5% rel. 10 sec
Gas flow velocity Indirect, with Pitot tube & pressure sensor 1 ÷ 50m/s | 0.1m/s 0.3m/s abs. or 5% rel. 10 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
U1÷U2 – external analogue input (voltage) Delta-sigma ADC -20V ÷ +20V | 0.01V ±2% rel. 10 sec
I1÷I2 – external analogue input (current) Delta-sigma ADC -20mA ÷ +20mA | 0.01mA ±2% rel. 10 sec

Drawings

Drawings

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.

  • 3m mains cable (type of plug to be selected)
  • Comparison scale with paper filters for the soot test
  • Single gas filter with condensation trap and filter inlet (pore size 5µm)
  • 2.5m RS-232C communication cable with DB9 female connector
  • Software CD with programs and manuals
  • Quick coupler for the probe holder (1pc.)

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

Probe holder

Probe holder

THIS ELEMENT IS ORDERED SEPARATELY, YET IT IS ESSENTIAL TO WORK WITH ANALYSER!
Together with an exchangeable gas probe pipe is a complete gas probe for extraction of gas samples.
It has single gas tube ended with quick coupler and electric cable ended with a 7-pin connector.
Gas probe pipe is mounted with a M30x1 fastening.
In the electric connector there is a PT500 sensor for measurement of ambient temperature.
Probe holder can be equipped with an in-line filter with a condensation trap (pore size of the filter inlet is 20µm).
Probe holder is available in two versions:

  1. heated (with a slit for a filter for soot measurement test)
  2. unheated (without a possibility to perform soot test)

Ordering code:
see probe holders section

Gas probe pipe

Probe holder

THIS ELEMENT IS ORDERED SEPARATELY, YET IT IS ESSENTIAL TO WORK WITH ANALYSER!
Exchangeable gas probe pipe mounted on the probe holder with M30x1 fastening.
It has thermocouple type K (in some configurations type S) for measurement of gas temperature and a threaded fixing cone. With the probe holder is a complete gas probe.
There are many probe pipes available. They differ in length and working temperature.
For work efficiency it is advised to own different probe pipes to be able to adjust to the measurement place.

Ordering code:
see gas probes section

Optional equipment

miniDryer

miniDryer

Condensation dryer based on the Peltier element with a built-in peristaltic pump for condensation removal.
It is powered via the analyser, and installed inside the analyser’s casing.
It has electric cable with a 7-pin connector and a 25cm gas tube ended with quick couplers - to connect it with the analyser.
It is not essential to work with the analyser, but is strongly recommended as it improves the measurements quality and extends the analyser’s life-time.

Ordering code:
M21-MDRY1

Ambient temperature sensor

Temperature sensor

This ambient temperature sensor on a 3m cable is used for measurement of the boiler’s inlet air.
In basic configuration the ambient temperature is measured by sensor installed in the connector of the gas probe handle.

Ordering code:
Z40P-SENS-TEMP

Pitot tube

Pitot

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

Ordering codes:
Z00-PITOT-5002,
Z00-PITOT-8002

RS232C to USB converter

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:
Z40P-USB-ADAP

Bluetooth communication module

Bluetooth

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

Ordering code:
Z40P-BLUE-TOOTH

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