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Draeger Polytron® Pulsar 2


Highly developed technology in Open-Path gas detection – the Dräger Polytron Pulsar 2 is intended for the detection of a range of gaseous hydrocarbons. This includes the alcane series from methane to hexane, propylene, ethylene, methanole and ethanole. Equipped with either a terminal box or a certified cable entry point, the detector can be very flexibly installed.

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Easy adjustment and commissioning

​Designed for one person installation and commissioning the
Pulsar does not require specialised training. Through use of a Hand-Held
Terminal the Pulsar Transmitter and Receiver can be accurately aligned,
gas level zeroed and commisioned with maximum efficiency. The factory
calibration of the Polytron Pulsar makes manual setting and test gas

System stability

​The detector is designed so that no fault remains undetected.
During normal operation, the output signal is between 4 to 20 mA,
depending on the measured gas concentration. A signal of < 1 mA
represents a fault due to a constant beam block or hardware failure
requiring immediate attention. However, a signal of 2 mA identifies a
beam block and will go to fault if this persists for more than 60
minutes. The Pulsar will also output a 3.5 mA signal to indicate
pre-warning where the optics may be dirty or mis-aligned. During the
period which the Pulsar displays ‘Pre-warning’ it will still detect gas
allowing the customer to schedule maintenance on the detector therefore
reducing down time. The Polytron Pulsar is suitable for SIL 2 rated

Heated optics

​Regulated internal lens heaters protect against build up of
ice and snow under adverse weather conditions. They also prevent
condensation on the lenses.


​The HART-Communication of the Polytron Pulsar allows for
digital communication between the explosion-proof and the secure areas.
Without additional cabling, you can obtain real-time access to the
status of individual detectors and to the configuration and historical
data of each device.

High performance

​The Pulsar Receiver communicates to the Transmitter via a
digital link which allows the Receiver to identify and adjust to
difficult environmental conditions. The microprocessor built into the
Receiver unit instructs the Transmitter unit to increase the flash rate
for increased performance and accuracy. The Polytron Pulsar is immune to
influences such as sunlight, gas flares, arc welding or resonance
effects due to vibrations of rotating parts, as well as to environmental
influences such as mist, drizzle or snow. The flash rate is also
increased upon the detection of gas to ensure both accuracy and fast

DrägerSensor technology

High sensitivity, long term stability and no false alarms are the hallmark of the new and improved third generation of sensors.
Sensors are the keystones of any gas detection system. Fastest response
to the target gas combined with minimal interference by other gases or
environmental influences (no false alarms) as well as the sensor life-time determine the reliability and the operating cost of a system.

​In-built database

The Receiver logs records and details a report of the last seven working days and a summary of the last 32 weeks. These reports
contain important information such as measuring values, events such as
“beam block” and gas alarms, warning signals, signal strength,
adjustments, supply voltage and operating temperature.

​Extensive access to the secure area

The optional AI500 Digital Interface can provide easy access to configuration, current measured values and the internal data-logger
from a non-hazardous area through Digital Communication. For large and complex installations, upto 32 AI500’s can be multidropped; therefore allowing access to up to 128 pulsars – useful for planning service and maintenance measures.


Brochure: More than the sum of their components (PDF)For over 70 years, Dräger has been one of the technology leaders in gas detection.