KM 2000 CnHm EM
Analisador de hidrocarboneto
Application
The modular constructed ADOS KM 2000 CnHm EM equipment incorporates a microcontroller-aided measurement device for measuring solvents. All combustible gaseous CnHm compounds can be measured with the exception of chlorinated and sulphur-sublimed hydrocarbons.
The thermocouples used for measurements, in conjunction with applying the principle of heat reaction, offer the following advantages:
- High degree of sensitivity
- Good accuracy
- Negligible drift of zero point
- Over-range signals have no effect
Fields of Application
Supervision of industrial processes
- KM 2000 CnHm EM:
Measuring the emission of hydrocarbons, according to the German clean-air regulations
- KM 2000 CnHm:
Measuring solvent saturation
Measuring the concentration of solvents
Concerning room air (ventilation) monitoring
A warning is issued at very low concentrations of poisonous gas thus preventing any danger to health.
| 1= |
Sampled gas intake |
| 2= |
Test gas intake |
| 3= |
Prefilter or compensating filter |
| 4= |
Sampled gas pump |
| 5= |
Flow regulator |
| 6= |
Flow-through meter |
| 7= |
Flow monitor |
| 8= |
Heating coil |
| 9= |
Catalyst chamber |
| 10= |
Reference measuring point |
| 11= |
Measuring point |
| 12= |
Reaction chamber |
| 13= |
Measuring amplifier |
| 14= |
Limit monitor 1-4 |
| 15= |
Measured value integration |
| 16= |
Continuous-line recorder |
| 17= |
Concentration indicator |
| 18= |
Heater |
| 19= |
Temperature Control |
| 20= |
Resistance-thermometer |
| 21= |
Gas outlet |
| 22= |
Inert mass |
| 23= |
Catalytic converter |
Measurement Principle and Function
Gas measurement system
The sampled gas is drawn in by a pump through a feed pipe (heated if required), to the reaction chamber, via a compensating filter, flow regulator and flow-through meter. The gas is warmed to a constant temperature by means of the heater coil and jacket and finally burned in a solid-matter catalytic converter. The difference in temperature before and after combustion, is used as the measurement signal that is prepared and evaluated by the microcontroller-aided analyser.
Analyser
The analyser functions on the principle of heat reaction.The difference in temperatures at the reference measuring point and the measuring point, is a directly-dependent variable of the component part of combustible substances in the gas. The reference measuring point is subjected to the heated non-burned gas mixture, whilst the second probe of the thermocouple pile measures the temperature of the burned gas. A load-independent current of 0-(4)-20 mA is available for connection to electric test meters, plotters and limit value monitors. An RS 232 or RS 485 interface is incorporated for data communication.
The inclusion of a measured value integration provides the facility of forming the average value of measured quantities, continuously or over a prescribed period of time.
Equipment Construction
The hydrocarbon measuring system ADOS KM 2000 CnHm EM consists of the following 19" rack units:
- Reaction chamber with sensor and electronics
- Gas suction system with or without constant heating for the feed pipes, with sampled gas pump, flow-through meter, flow regulator, flow monitor and filter.
- Microcontroller-aided evaluation unit in 19"-system with application specific standard plug-in Euro-cards
- Housing
Accessories
- CnHm EM sampling probes heated or unheated
- Mounting flanges for removal of heated extraction pipes
- Heated extraction pipes
- Test gas bottles with pressure reducer
- Pollution control computer EUR 196 according to the clean-air regulations
- Continuous-line recorder
- Air purging system
- Compensation of CO cross-sensitivity
- Automatic calibration system
Technical Data
| Measurement principle: |
Measuring the heat of combustion in a catalytic converter |
| Measuring ranges: |
0 - 50 mg C/m3 TOC up to 0 - 1600 g/m3 TOC |
| Minimum detection limit: |
1 mg C/m3 TOC |
Cross sensitivity
(50 mg/m3 measuring range): |
| concentration: |
max. deviation: |
| 200 mg/m3 SO2 |
-10 % |
| 30 mg/m3 NO2 |
-2,5 % |
| 300 mg/m3 CO |
+108 % |
| 300 mg/m3 NO |
+7 % |
|
| Output signals: |
Current interface 0-(4)-20 mA
max. load 400 ohm; RS 232 |
| Response time (t90): |
< 200 sec. sampling pipe (approx. 11 m; dead time 10 sec.) |
| Accuracy: |
< 2 % full-scale error |
| Permissible ambient temperature: |
+5 °C to +40 °C |
| Temperature dependency: |
< 5 % full-scale error |
| Sampled gas flow: |
125 l / h (±10 l/h) |
| Preheating time: |
approx. 120 min. |
| Maintenance interval: |
4 weeks with auto-calibration
1 week without auto-calibration |
| Mains supply: |
230 V / 50 Hz; 150 V / 60 Hz; 600 VA |
| Dimensions (W x H x D): |
600 x 478 x 500 mm |
| Weight: |
approx. 43 kg |
| Test certificate: |
TÜV approval according to the clean-air regulations ("TA-Luft");
TÜV-report: 936 / 21 200 245 |