Features
- Stable long-life metal-oxide / pellistor sensor
- Range 0...100% LEL CH4
- Resolution 0,1 / 1 % LEL CH4
- Two SPST relays option
- 2 × 4-20 mA or 0-10 V, RS485
Description
Methane detector-transmitter E2638-CH4 is a member of new PluraSens® family of multifunctional measurement instruments.
Applications include underground parkings, boiler houses, kitchens, and other areas, where potentially explosive concentration of methane can accumulate.
The instrument utilises fully calibrated metal-oxide semiconductor or pellistor gas sensors with excellent repeatability, stability and long lifetime.
Two relays with closing contact (optional) may be used for remote signalling or concentration control. Two alarm set-points are user settable.
Two analog outputs and RS485 digital interface with industry standard Modbus RTU protocol can be used to connect the detector to safety or building automation systems.
Technical Data
| Calibration | methane CH4 |
| Sensor type | metal-oxide semiconductor (MOS) |
| pellistor (catalytic bead) on demand | |
| Sampling method | diffusion |
| Detection range | 0...100% LEL CH4 |
| Resolution | 0,1 / 1 %LEL CH4 |
| Sensor lifetime | > 5 years (MOS) |
| > 3 years (pellistor) | |
| Power supply | 12...36 VDC (default), |
| 24 VAC or 230 VAC as options | |
| Digital interface | RS485, Modbus RTU protocol |
| Analog outputs | 2 × 4-20 mA / 0-10 V, user settable |
| Output relays (option) | 2 × SPST relays (closing contact), |
| 250 VAC / 30 VDC, 5 A max | |
| Default alarm set-points | 20% LEL / 50% LEL CH4 |
| Enclosure | grey ABS plastic, wall mount, IP65 |
| Dimensions | H90 × W145 × D55 mm |
| Operating conditions | -40...+70 °C, 15...95 %RH (MOS) |
| -10...+50 °C, 0...95 %RH (pellistor) |
