Continuous Gas Measurements Greater Measuring Accuracy Lower Maintenance Costs Reliable Measurement. From ENOTEC

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1 COMTEC 6000 The World's First InSitu O 2 & CO e * (Combustibles) Analyser Continuous Gas Measurements Greater Measuring Accuracy Lower Maintenance Costs Reliable Measurement From ENOTEC Also available with HART and Fieldbus Interface!!! * The Ga 2 sensor measures not only CO but also all other combustibles. The volume of this combustibles is been indicated in relation to the value of CO. Therefore the sensor measures COequivalent. COMTEC 6000 is a totally new and unique InSitu Oxygen & COe (Combustibles) flue gas and process gas analyser. The innovative combustibles sensor pioneered and developed by ENOTEC (patent pending), combines with its world-proven "leak-proof" Zirconia Cell technology to produce the worlds first InSitu O 2 & COe analyser.

2 Fig. 2 System Configuration of COMTEC 6000 Both measuring cells, (O 2 & COe), are actually located inside the process measuring actual real-time values without the need for sampling, conditioning and expensive hybrid systems. The COMTEC 6000 probe simply installs directly inside the duct for direct & continuous dual readings of Oxygen & COe present. COMTEC 6000 can easily be installed as standalone instrument or as a retrofit upgrade to an existing system. It's designed to be maintenance free, with minimal calibration requirements, and completely user-friendly operation. Features of the COMTEC 6000 Analysing System: Both measurements completely InSitu in the process Versions available for Installation in Safe or Hazardous locations Ideal for all fuels: Coal, Oil, Gas and Waste Products. Easy installation & calibration. Measuring Range: Oxygen: 0-2 %O 2 to 0-25 % O 2 (other on request) COe: ppm COe to 0 10,000 ppm COe (others on request) Twin (O 2 & COe) LCD SME5 electronic simultaneous displays. Dual 4-20mA isolated outputs for O 2 & Combustibles Fully field serviceable & repairable Full 2-Year Warranty program.

3 Fig. 3 Display of the COMTEC Electronic Unit The Measuring Principle of COMTEC 6000 The COMTEC 6000 measures the net concentration of O 2 and COe (combustibles) in the flue gas of combustion. The water content existing in any flue gas and which has an influence on the actual O 2 concentration is taken into account in this wet measuring process. Measuring principle of the ZrO 2 -sensor for O 2 measurement The EMF (electrical motive force) produced by a temperature-stabilised Zirconia cell indicates the amount of oxygen concentration. Measurement is made direct and InSitu, i.e. the measuring cell is inside the flue gas duct at the end of a probe in the middle third of the gas stream. The measuring cell consists of a small zirconium-oxide disc, which is coated with porous layers of platinum on both sides and soldered with a gas-tight seal into the end of a steel tube cell holder. The temperature of the measuring cell is stabilised by a built-in heater whose temperature is kept constant by a temperature controller. At a constant temperature the mv-output of the cell is equal to the Nernst equation.

4 Fig. 4 Schematic diagram of the COMTEC measuring head The reference gas (Instrument Air) is clean, dry and oil-free air (20.95% by volume O 2 ). When different oxygen concentrations occur between measuring and reference side of the electrochemical cell, there is a migration of oxygen ions from the higher to the lower partial pressure side. The mv output signal of the cell is inversely logarithmically proportional to the oxygen content of the process gas. The reduction of oxygen content in the process gas causes the mv signal of the measuring cell to increase. Air on the process gas side, the ZrO 2 -cell generates approx. 0 mv ± 5 mv (cell constant) and with 2.1% O 2 approx mv (rise of the characteristic line or decade voltage). Measuring principle of the Ga 2 -sensor for COe measurement In general, a metal oxide sensor consists of an active layer, which resistance changes when exposed to the gas being measured. This unique semiconductor gas sensor is operated at high temperatures approx. 750 C. Ga 2 sensors show faster response and recovery times and lower cross sensitivity to humidity than other sensors. Additionally, Ga 2 based sensors show stable long-term sensor properties even in flue gases containing of sulphur and dirt e.g. found in fuel oil burners. Furthermore, the sensor has an excellent performance and measurement repeatability.

5 The benefits of the Ga 2 cell compared to other materials are the physical and electronic characteristics of the material. Compared to other commercially available metal oxide sensors, Ga 2 sensors provide a series of unique product features: sensors do not require any pre-aging or conditioning as some other metal oxide sensors. They are completely stable from first use and measure accurately within a few seconds from start up. sensors show faster response and recovery times than other comparable sensors. They are almost insensitive to humidity changes. The selectivity and sensitivity can be controlled by the use of catalytic filter layers. sensors have excellent manufacturing characteristics that produce consistent performance for the sensor resistance and operating sensitivity. sensors are also stable in atmospheres with low O 2 concentration (< 0.1 Vol %). Technical Data of COMTEC 6000 Dimensions:: see dimension drawings for probe and electronic unit Mains voltage: 230 V/50 to 60 Hz tolerance +/-10% 115 V/50 to 60 Hz tolerance +/- 10% Power consumption: 400 VA during heating up VA during operation Series fuse recommended: 10 A Flue gas temperature: < 600 C < 1400 C with gas cooling tube Ambient temperature: -20 C to +55 C other temperatures on request Immunity from disturbance: European low voltage general directions: EN : July 1993 EN : March 1995 Relay outputs: floating: 230 V~ 5 A resistive load Resolution of A/D converters 14 Bit + sign in the active measuring range: Analogue input of thermocouple: Re: >900 kilo Ohm Temperature compensation: Electronic Signal outputs 0/4 to 20 ma: Load max. 500 ohm, potential-free Response time of ma output: < 200 ms Display: LCD, LED-illuminates, 240 x 64 points, graphic display

6 Interfaces: Measuring Range: Download Area RS 232, RS 485, bus compatible Oxygen 0-2 % O 2 to 0-25 % O 2 (other on request) COe (Combustibles): ppm COe to 0 10,000 ppm COe (others on request) For more information about CEMTEC, you can download the following video file: COMTEC Video (ca. 8,5 MB) (Replay Time 4:43 min) BACK HOME Impressum / Imprint Home Copyright ENOTEC GmbH, Germany Höher Birken 6, D Marienheide Tel (0) info@enotec.de