STATIONARY GAS ANALYSERS - CEMS
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CMS-7
Stationary Flue Gas Analyser
The stationary gas analyser CMS-7 is installed in a robust metal housing with a lockable transparent door. It can be either wall-mounted or stand on a table. The instrument consists of three separate panels: power supply, Peltier gas conditioner and analyser. The sample gas is transported over a heated hose with integrated heated filter to the analyser. The measurement results can be read directly from the integrated screen, transported to a PC over RS232C or placed on the standard analogue current/voltage outputs.

Application possibilities

  • Biogas plants
  • Landfills
  • Greenhouses
  • Stationary control of combustion systems
  • Incinerators
Pictures
Product info
Folder cms-7 (80 kB))
Manual (1,5 MB)
Properties

Measurement of gas concentrations

  • Gases measured with NDIR sensors: CO, CO2, CH4, N2O
  • Gases measured with electrochemical sensors (max. 9 Sensoren): O2, CO, NO, NO2, SO2, H2, H2S. Information about other gases on request

Measurement of other values

  • Gas and ambient temperatures
  • Positive, negative and differential pressure with 1 Pa resolution
  • Atmospheric pressure (800...1200 hPa)
  • Calculations
    • CO2 concentration (if not measured with infrared sensor)
    • Calculation of all relevant combustion parameters

Display of Results

  • All measured and calculated values can be shown on the display as current or average values
  • Averaging of all measured values. Averaging times: 2, 10, 20, 30, 60, 120 and 180 seconds
  • Display of all values as graphs
  • Data logger on MMC card
  • Complete PC software for data processing and on-line communication
  • Voltage outputs: 8 channels 0...10 V
  • Current outputs: 8 channels 0/4...20 mA

Software capabilities

  • International compatibility (language, date format, units etc.)
  • Automatic zeroing after switching on.
  • Calibration of O2/CO2 possible during measurement
  • All parameters can be programmed
  • Complete list of 22 fuels
  • Further fuels can be programmed by user
  • Automatic permanent check of instrument in the "control list". Acoustic and optical warning
  • Cross-sensitivity and temperature drift of sensors compensated automatically

Hardware capabilities

  • Peltier gas conditioner with condensate pump
  • Integrated clock/calendar
  • Large LCD display with backlighting
  • Gas probe with thermocouple
  • Heated inlet filter
  • Heated gas hose
  • PC interface RS 232 C

Operating data
Parameter Description
Size W x L x H: 600 x 635 x 516 mm
Weight without probe 48 kg
Display size Graphic LCD with backlighting. Contrast set by user, 320 x 240 pixels
Data logger MMC 256 MB
Interface RS232C
Supply Mains 230 VAC 50 ÷ 60Hz
Gas pump Membrane pump, set to 90 l/h
condensate pump peristaltic pump, electronically controlled
Probe length 300 mm (other lengths available)
Sample hose Heated hose, 3 m
Gas filter Heated filter 20 µm
Analogue outputs / Voltage 8 channels: 0...10 V
Analogue outputs / Current 8 channels: 0/4...20 mA
Operating temperature 10°C ÷ 40°C
Storage temperature -20 °C ÷ +55 °C
Humidity 5 - 90 %, non-condensing

Only NDIR sensors
Parameter Description
Measuring method
 NDIR light absorption, 1 channel with light modulation
Averaging time
 2 ÷ 60 s freely programmable
Calibration
 10 point calibration, stored in EEPROM
Recalibration
 not necessary

Only electrochemical sensors
Parameter Description only for electrochemical sensors
Measuring method
 electrochemical
Averaging time
 2÷30 s freely programmable
Calibration
 2 point calibration, variable
Recalibration
 At least every 12 months

Technical data
Component Method Range Resolution Detection Level Accuracy Time (T90)
NDIR sensors
CO - Carbon monoxide-Volume concentration

CO2 - Carbon dioxide-Volume concentration

CH4 - Methane-Volume concentration		 IR Sensor 0...100 % 0.10 % 0.10 % +/- 3 % rel.,
or 0.5 % abs.		 45 s
0....50 % 0.10 % 0.10 % +/- 3 % rel.,
or 0.3 % abs.
0...25 % 0.01 % (100 ppm) 0.01 % (100 ppm) +/- 3 % rel.,
or 0.15 % abs.
0...1 0% 0.01 % (100 ppm) 0.01 % (100 ppm) +/- 3 % rel.,
or 0.05 % abs.
0...5 % 0.01 % (100 ppm) 0.01 % (100ppm) +/- 3 % rel.,
or 0.03 % abs.
0...2.5 % 0.001 % (10 ppm) 0.001 % (10 ppm) +/- 3 % rel.,
or 0.015 % abs.
N2O - Nitrous oxide -Volume concentration 0...500 ppm 1 ppm 1 ppm +/- 3 % rel.,
or 5 ppm abs.
Electrochemical sensors
CO - Carbon monoxide, Volume concentration Electrochemical
sensors 		0...20000 ppm 1 ppm 1 ppm +/- 5 % of measured value,
at least 5 ppm abs.		 45 sec.
NO / NOx - Nitric oxide, Volume concentration 0...5000 ppm 1 ppm 1 ppm
NO2 - Nitrogen dioxide, Volume concentration 0...1000 ppm 1 ppm 1 ppm
SO2 - Sulphur dioxide, Volume concentration 0...5000 ppm 1 ppm 1 ppm
H2S - Hydrogen sulphide, Volume concentration 0...1000 ppm 1 ppm 1 ppm
H2 - Hydrogen, Volume concentration 0...2000 ppm 1 ppm 1 ppm
Partial pressure sensor
O2 - Oxygen, Volume concentration partial pressure sensor 0...25 % 0.01 % 0.01 % +/- 5 % rel.,
or 0.2 % abs.		 45 sec.
Measured temperatures
Tgas – Temperature of the flue gases Thermocouple -20..2000°C 1°C 1°C +/- 1.5 % rel.,
or ± 2 °C		 30 s
Tamb – Ambient temperature Thermistor -20..100°C 0.1°C 0.1°C ± 1 °C 30 s
Further values
Atmospheric pressure DMS bridge 800...1200 hPa 1 hPa 1 hPa ± 10 hPa 10 s
Pressure/draught DMS bridge -25...0...+25 hPa 0.1 or 1 Pa
as set		 0.1 or 1 Pa
as set		 +/- 5 % rel.,
or 2 Pa		 10 s
Diff. pressure DMS bridge -20...0...+20 hPa 0.1 or 1Pa
as set		 0.1 or 1Pa
as set		 +/- 5 % rel.,
or 2 Pa		 10 s
V – Flow velocity Pitot tube 1...30 m/s 0.1 m/s 0.1 m/s +/- 2 % rel.,
or 0.5 m/s		 10 s
Calculated combustion parameters
TI (CO/CO2-Toxic Index) Calculated 0...1 % 0.01 % 0.01 % 0.01 % 10 s
Lambda – Excess air Calculated 1..10 0.01 0.01 0.01 10 s
qA – Combustion loss Calculated 0..100 % 0.1 % 0.1 % 0.1 % 10 s
Eta -Efficiency Calculated 0..100 % 0.1 % 0.1 % 0.1 % 10 s
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