The Drager Polytron SE Ex is a fixed Flammable Gas Detector fitted with a catalytic bead sensor measuring 0-100% LEL. The output is an mV signal which varies according to gas concentration, the connection to a central controller is by a three-core cable. Suitable for deployment in hazardous areas.
The measurement is based on the heat of reaction principle, where a chemical reaction takes place in a catalytic bead (so-called pellistor)
inside the sensor. Drager sensors are designed to give fast response, also temperature and poison resistant. Three types are available PR, a standard 0-100% LEL, HT high-temperature version (up to 150C) and LC low concentration version 0-10% LEL suitable for leak detection.
Models also vary by the size of the sensor junction box:
- M1 – small standard housing
- M2 – standard midsize housing – use for outdoors (stopper installed inside the gland, cable insertion at the bottom)
- M3 – large GRP plastic housing
- NPT1 – flame-proof metal housing use with conduit installs
Housing: Glass-fibre reinforced Polyester (GRP) or Aluminum NPT1
Ordering Details
6812711 PR M1 DD, small standard housing, 0 … 100 %LEL
6812710 PR M2 DD, midsize standard housing, 0 … 100 %LEL
6812718 PR M3 DD, large GRP plastic housing, 0 … 100 %LEL
6812800 PR NPT1 DD, flame-proof metal housing, 0 … 100 %LEL
6812722 LC M1 DD, small standard housing, 0 … 10 %LEL
6812721 LC M2 DD, midsize standard housing, 0 … 10 %LEL
6812719 LC M3 DD, large GRP plastic housing, 0 … 10 %LEL
6812801 LC NPT1 DD, flame-proof metal housing, 0 … 10 %LEL
6812720 HT M DD, high-temperature version, 0 … 100 %LEL
Sensors
6812220 PR M DD
6812380 PR NPT DD
6812390 HT M DD
6810350 Ex-Sensor -replaced by 6812720
6810675 Ex-Sensor LC NPT
Accessories
6810537 Dust filter for Sensor PR M DD and PR NPT DD (PE-discs, 10 pcs.)
6806978 Calibration adapter (PE, max. operation temperature 70 °C) 68 06 978
6812470 Process adapter (stainless steel, with locking nut M30 x 1,5) for sensor PR M DD, PR NPT DD and HT M DD
6812465 Process adapter (stainless steel, with locking nut M36 x 1,5) for Ex-Sensor LC M and LC NPT
