The Drager Polytron 8900 UGLD is an explosion-proof transmitter. The sensor is an ultrasonic microphone housed in an intrinsically safe enclosure, sealed in PVC to prevent water and dirt ingress. The area monitor detects high-pressure gas leaks in outdoor process environments.
Fast response is guaranteed as, instead of detecting gas clouds affected by wind and weather, the ultrasonic acoustic sensor picks up the noise of a gas leak. It detects any gas escape instantly. This early warning can prevent operations from grinding to a halt and allows maintenance to be scheduled, reducing downtime and cost.
Once it detects a leak, the unit’s backlit display shows the ultrasound level and transmits it. Alarms are set above background noise. You can configure a time delay (up to 30 seconds).
Operation is possible in noisy environments; pressurised gas leaks from vessels produce audible and inaudible ultrasound. The Polytron 8900 is tuned specifically to detect ultrasound, identifying gas leakage at a rate of 100 g/sec within a 20-meter radius. Frequent calibration is not required. Some alternative ultrasonic gas leak detectors cannot be calibrated; the 8900 calibrates easily.
The transmitter uses the same interface as other models in the 8000 range, providing a common operating mode, reducing training time, and simplifying event interpretation. Polytron 8900 readings are shown from 0 to 100% of the full-scale decibel sensitivity range.
Features
- Measurement range: 0-100%, equivalent to 55-110 dB re 20μPa.
- For: Flammable & toxic gases such as hydrogen, methane, propane, CO2, nitrogen & hydrogen sulphide.
- Pressure: 700 to 1,300 mbar.
- Outputs: 4-20 mA Analogue and HART Digital.
- Operating Temperature: -40 to 60°C.
- Two alarm relays and one error relay.
- Approvals: ATEX & IECEx. UL pending, CSA planned.
- Dimensions: H 28 x W 15 x D 13 cm. Weight: 5.0 kg.
