Enotec

United Kingdom

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Measuring principle of the Ga2O3-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. Ga2O3 sensors show faster response and recovery times and lower cross sensitivity to humidity than other sensors. Additionally, Ga2O3 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

n excellent performance and measurement repeatability. The benefits of the Ga2O3 cell compared to other materials are the physical and electronic characteristics of the material. Compared to other commercially available metal oxide sensors, Ga2O3 sensors provide a series of unique product features: • Ga2O3 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. • Ga2O3 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. • Ga2O3 sensors have excellent manufacturing characteristics that produce consistent performance for the sensor resistance and operating sensitivity. • Ga2O3 sensors are also stable in atmospheres with low O2 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 100-200 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 50081-2: July 1993 EN 50082-2: March 1995 Relay outputs: floating: 230 V~ 5 A resistive load Resolution of A/D converters in the active measuring range: 14 Bit + sign 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 Interfaces: RS 232, RS 485, bus compatible Measuring Range: Oxygen 0 - 2 % O2 to 0 - 25 % O2 (other on request) COe (Combustibles): 0 – 500 ppm COe to 0 – 10,000 ppm COe
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