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Products >> Gas Analysers >> Portable Analysers >> GA-21 plus
GA-21plus combustion gas analyser in hard case
GA-21plus

Portable combustion gas analyser using electrochemical gas sensors.

The combustion gas analyser GA-21plus is designed especially for service technicians who are permanently employed in measuring emissions and carrying out adjustments on various burner and heating equipment. Using the optional NO and NO2 sensors it is possible to calculate NOx simply as the sum of NO and NO2. SO2 can also be measured if needed. All parts of the combustion gas analyser are designed for a long and trouble-free operation.
Using the optional Peltier dryer it is possible to carry out longer term measurements. Three extra analogue inputs allow the simultaneous measurement of a voltage or current signal and a temperature. This makes it ideally suited for measurements on district heating plants. Manufactured with EN50379 in mind.
Pictures
Product info
Brochure (60 kB))
Manual (605 kB)
PC software (17,6 MB)
Standard configuration
  • Measurement of gas concentrations
    • Gas concentrations measured with NDIR sensors: CO2, CH4
    • Gas concentrations measured with electrochemical sensors: O2
    • Toxic gas concentrations measured with electrochemical sensors: CO, NO, NO2, SO2. Please ask for quote for other gases.
  • Measurement of other parameters
    • Measurement of gas and ambient temperatures
    • Pressure, draft and differential pressure measurements with 1 Pa resolution
    • Soot test according to Bacharach with a pump flow of 1.62 l/min
    • Flow velocity (Option)
    • Three analogue inputs (1 current/voltage, 1 thermocouple, 1 thermistor)
  • Calculation
    • CO2 concentration
    • Calculation of absolute and relative mass concentrations & relative emissions
    • Calculation of all relevant combustion parameters
  • Processing and presentation of measured data
    • All results shown on display
    • Averaging of all measured values. Averaging time: 10 sec - 60 min
    • Graphical presentation of all measured values as diagram
    • Memory capacity for 1024 sets of data, organised into 10 data banks
    • Up to 9 separate items in a data set
    • User definition of the 9 items
    • Memory capacity for 30 reports
    • Data logger function for the analogue inputs
    • All measured values, stored values or displays can be printed on the internal printer.
    • Powerful PC program for analyser settings and data communication
  • Software-Eigenschaften
    • International compatibility (language, date format etc.)
    • Password protection for settings
    • Automatic zeroing when the analyser is switched on
    • Calibration of O2/CO2 during use
    • All parameters programmable
    • List of 22 common fuels
    • 10 further freely programmable fuels
    • Permanent automatic check of the instruemnt with acoustic warning and full information in the "control list"
    • Compensation of cross sensitivity and temperature drift of gas sensors
  • Hardware capabilities
    • Electronic regulation of the pump flow rate
    • Integrated clock/calendar
    • Internal 57 mm dot-matrix printer
    • Power from rechargeable battery or mains
    • Big (70 x 60 mm) LCD display with backlighting (Graphics or 11 x 21 characters)
    • Gas probe with thermocouple and condensate trap
    • Power for heated probe holder during mains operation
    • RS-232C interface and multifunctional PC program
Optional accessories
    • Choice of soft carrying case or hard housing
    • Mini Peltier gas dryer with peristaltic pump
    • External ambient temperature sensor
Technical data
    • Size of case W x H x D: 460 x 160 x 170 mm
    • Weight w/o probe: 6,2 kg
    • Display size: Graphical - LCD, with backlighting and variable contrast, 128 x 112 pixels, 75 x 64 mm
    • Printer: high-speed dot matrix printer with graphics capability for 57 mm normal paper
    • Data memory: Memory for 30 reports and 10 banks containg a total of 1024 sets of data 
    • CO - measurement channel: Separate from the other gas channels. If the freely programmable maximum is exceeded then the sensor is purged with air, without interrupting the other measurements (option)
    • Interface: RS232C
    • Power supply: 110 or 230 VAC 50 ÷ 60 Hz
    • Charging time: Lead-acid battery 12 V/2.2 Ah, charging time 10 h, working time approx. 6 h (w/o dryer))
    • Gas pump: Membrane pump, electronically regulated at 90l/h
    • Probe: Heated for soot test
    • Probe length: 300 mm (other options available)
    • Length of gas line: 3m
    • Gas filter: In line filter 20 µm
    • Operating temperature: 10 °C ÷ 50°C
    • Storage temperature: -20 °C ÷ +55 °C
Parameter
Method
Indication range
Display resolution
Accuracy
Detection limit
Resp. time (t90)
Gases measured in standard configuration
O2 - oxygen, volumetric concentration
electrochemical gas sensor
0..25 %
0.01 %
 0.20 % 0.20 %
45 s
CO2 - carbon dioxide, volumetric concentration
calculated from volumetric concentration of O2
0..25 %
0.01%
 0.20 % 0.20 %
45 s
CO - carbon monoxide, volumetric concentration
electrochemical gas sensor
0..20000 ppm
 1 ppm
±5 ppm or
5 % rel.
5 ppm
45 s
COmg - carbon monoxide, mass concentration
calculated from volumetric concentration of CO
0...
1 mg/Nm3
±10 mg/Nm3 or 5 % rel.
10 mg/Nm3
45 s
COrel - carbon monoxide, mass concentration relative to O2
calculated from volumetric concentration of CO and O2
0...
1 mg/Nm3
±10 mg/Nm3 or 5 % rel.
10 mg/Nm3
45 s
Gases measured with optional IR sensors
CO2 - carbon dioxide volumetric concentration
NDIR sensor
0..25 %
0...100 %
0.01 %
 +/-3 % rel., or 0.5 % abs.
0.20 %
45 s
CH4 - Methane, volumetric concentration
NDIR sensor
0...5 %
0...100 %
0.01 %
0.1 %
 +/-3 % rel., or 0.5 % abs.
0.20 %
45 s
Gases measured with optional electrochemical sensors
NO / NOx - volumetric concentration of nitrogen oxides.
electrochemical gas sensor
0..1000 ppm
1 ppm
±5 ppm or 5 % rel.
5 ppm
45 s
NOmg/NOxmg - mass concentration of nitrogen oxides
calculated from volumetric concentration of NO
0...
1 mg/Nm3
±15 mg/Nm3 or 5 % rel.
15 mg/Nm3
45 s
NOrel / NOxrel - mass concentration of nitrogen oxides relative to O2
calculated from volumetric concentration of NO and O2
0...
1 mg/Nm3
±15 mg/Nm3 or 5 % rel.
15 mg/Nm3
45 s
NO2 - volumetric concentration of nitrogen dioxide.
electrochemical gas sensor
0..1000 ppm
1 ppm
±5 ppm or 5 % rel.
5 ppm
45 s
NO2mg - mass concentration of nitrogen dioxide
calculated from volumetric concentration of NO2
0...
1 mg/Nm3
±15 mg/Nm3 or 5 % rel.
15 mg/Nm3
45 s
NO2rel - mass concentration of nitrogen dioxide relative to O2
calculated from volumetric concentration of NO2 and O2
0...
1 mg/Nm3
±15 mg/Nm3 or 5 % rel.
15 mg/Nm3
45 s
SO2 - volumetric concentration of sulphur dioxide.
electrochemical gas sensor
0..5000 ppm
1 ppm
±5 ppm or
5 % rel.
5 ppm
45 s
SO2mg - mass concentration of sulfur dioxide.
calculated from volumetric concentration of SO2
0...
1 mg/Nm3
±15 mg/Nm3 or 5 % rel.
15mg/Nm3
45 s
SO2rel - mass concentration of sulfur dioxide relative to O2
calculated from volumetric concentration of SO2 and O2
0...
1 mg/Nm3
±15 mg/Nm3 or 5 % rel.
15 mg/Nm3
45 s
Other measured values
Tgas - flue gas temperature
Thermocouple
-10..1000°C
1°C
± 2 °C or 1.5 % rel.
1 °C
30 s
Tamb - ambient temperature
Thermistor
-10..100°C
1°C
± 1 °C
1 °C
30 s
U/I - external input
ADC
-20...+20 V
-20...+20 mA
0.01 V
0.01 mA
±0.02 V
±0.02 mA
0.01 V
0.01 mA
10 s
T1 - external input
Thermocouple
0...1600°C
1°C
±2 °C or 1. 5 % rel.
1 °C
10 s
T2 - external input
Thermistor
-20...1000°C
1°C
±2 °C or 1. 5 % rel.
1 °C
10 s
Pressure
DMS bridge
-25 hPa ... +25 hPa
0.1 Pa
±2 Pa or 5 % rel.
1 Pa
10 s
Flow velocity (Option)
Pitot tube
1...50 m/s
0.1 m/s
0.3 m/s or 5 % rel.
0.1 m/s
10 s
Soot/smoke test
Bacharach method
0..9
0.5
0.5
0.5
TI (CO/CO2-Toxic Index)
calculated
0...0.01
0.0001
5 % rel.
0
10 s
Lambda - excess air number
calculated
1..10
0.01
2 % rel.
0
10 s
qA - combustion losses
calculated
0..100 %
0.1 %
2 % rel.
0 %
10 s
Eta - efficiency
calculated
0..120 %
0.1 %
2 % rel.
0 %
10 s
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