VQ549
FEATURES
- Optimised for bustible gases and vapours
- Thermal conductivity versions available
- Certified explosion proof ponent
- Integral pellistors
- Low power
- Standard miniature body size
- Poison resistant
- silicones and hydrogen sulfide
- Shock resistant
- ATEX certified
- IECEx certified
- CSA certified
- UL recognised
- Temperature Rated between -40°C and +55°C
OPERATING PRINCIPLES
The detector consists of a fine coil of platinum wire embedded in a ceramic bead incorporating a noble metal catalyst. The coil acts both as an electrical heater and as a resistance thermometer. The bead is mounted on a header with connecting leads and is surrounded by a metal can with the end open to the atmosphere.
If a flammable gas is present when the bead is heated to about 400 to 500 °C, the gas will oxidise and the resultant release of energy will heat the bead still further. This increase in temperature is detected as an increase in resistance of the coil.
The temperature of the coil is...
