Dräger Polytron 8900 UGLD gas leak transmitter

The Dräger Polytron 8900 UGLD transmitter is an early warning area monitor for detecting high-pressure gas leaks in outdoor industrial process environments.

Utilising an ultrasonic acoustic sensor, it responds earlier than conventional gas detectors because it registers the sound of leaking gas instead of measuring the concentration of accumulated gas clouds.

Loud process areas generate noise which is mostly in the audible spectrum. Gas leaks from pressurised vessels above 10 bar generate both audible sound and inaudible ultrasound. Since Polytron 8900 is tuned to measure in the ultrasound spectrum, it can easily identify gas leaks with a leak rate of 100 g/s in a 20 m radius circle.

The measured values on the display of the Polytron 8900 UGLD are shown from 0 to 100% of the full-scale decibel sensitivity range. The ultrasound level is immediately displayed and transmitted and allows for an easy interpretation. Alarms are configured at a specific level above a predetermined background noise level. Additionally, a time delay of up to 30 s can be set in the control system.

The Polytron 8900 UGLD is an explosion-proof transmitter with a sensor housed in a galvanically isolated, intrinsically safe enclosure. The sensor is an ultrasonic microphone that is completely sealed in PVCC, making it impervious to water and dirt. Regular calibration is not necessary, but calibration is possible and easy with the offered calibration kits. The expected lifespan of the ultrasonic sensor is more than 10 years.