Drager Polytron Pulsar

  • Discontinued
  • Open Path Detector
  • Approvals ATEX, IECEx, UL, CSA, FM, DNV & GOST

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Now obsolete replacement here.

The Drager Polytron Pulsar is the latest infrared technology in open path gas detection, capable of detecting a wide range of gaseous hydrocarbons. These include the alkane series from methane to hexane, propylene, methanol, ethanol and ethylene.

Simple to align and commission

One person can easily align and commission the system without the need for specialised training or skills. No telescope or alignment mirrors are needed for the installation over any distance. After an initial coarse adjustment by eye, a handheld terminal provides separate “radar” displays of the Transmitter and Receiver alignments. This makes it easy to optimise the adjustment for maximum signal strength.

The built-in calibration of the Polytron Pulsar does not need any manual adjustment or standard test gas. After the alignment procedure is finished, a self zeroing sequence is started to complete the commissioning of the system. The alignment and signal strength parameters are logged and used to determine any future misalignment or build-up of deposits on the optical lenses.

Increased performance

Continuous communication between the receiver and transmitter across a signal line allows the system to adapt to challenging environmental conditions and ensure the highest availability. The high power xenon lamps combined with a sophisticated algorithm that varies their intensity and frequency makes the Drager Polytron Pulsar immune to influences from solar radiation, stack flares, arc-welding or resonance effects associated with the vibration from rotating machinery, as well as environmental changes along the beam like fog, mist, and snow. A higher flash rate is also triggered by the first indication of gas, allowing a fully validated gas reading and reduced response time.


The detector is designed so that no fault can go undetected. The output signal is 4 to 20 mA in regular operation, depending on the gas concentration measured. Whereas a signal of < 1 mA indicates a fault, and 2 mA indicates a beam blockage. Also, a continuous self-test of the Dräger Polytron Pulsar will issue a pre-warning signal of 3.5 mA where the detector is still operational but requires some attention – for example, when there is a build-up of deposits on the optics or misalignment of the transmitter or receiver. This way, maintenance can be scheduled without downtime. The Polytron Pulsar carries a Safety Integrity Level rating of 2 (SIL 2).

Heated optics

Controlled internal heating of the optical lenses prevents ice formation and snow build-up on the optics even under severe weather conditions. It also eliminates condensation build-up on the lenses.

Built-in data logger

An internal data logger keeps a detailed record for the previous seven days and consolidated records for the last 32 weeks. These logs include such essential information as actual readings, events like “beam block” and gas alarms, warning flags, signal strength, alignment, supply voltage and internal temperature.

Gas library

The detector can be pre-calibrated for up to four gases. Each detector is supplied with methane and propane calibration as standard, which is field selectable by the user.

GD8 Drager Polytron Pulsar

2350292 Polytron Pulsar ATEX 4-60m (Complete TX + RX)
2350294 Polytron Pulsar ATEX 30-120m (Complete TX + RX)
2350304 Polytron Pulsar Demonstration unit (c/w HHT, tripods, cables, controller)
2350308 Polytron Pulsar ATEX 100-200m (Complete TX + RX)
2350309 Polytron Pulsar ATEX 4-60m (TX only)
2350310 Polytron Pulsar ATEX 30-120m (TX only)
2350311 Polytron Pulsar ATEX 100-200m (TX only)
2350312 Polytron Pulsar ATEX 4-120m (RX only)
2350313 Polytron Pulsar ATEX 100-200m (RX only)
2350393 Polytron Pulsar ATEX 4-120m (RX only Ethylene)
2350394 Polytron Pulsar ATEX 100-200m (RX only Ethylene)
2350419 Polytron Pulsar ATEX Duct Mount


2350297 Sun Shield (stainless steel)
2350298 Junction Box Dräger Polytron Pulsar ATEX (Ex e)
2350299 Mounting Plate Dräger Polytron Pulsar
2350302 Set of 4 U Bolt pipe fixings for 150mm diameter pipe (standard Dräger Polytron Pulsar)
2350306 AI500 Digital interface unit for Dräger Polytron Pulsar
2350325 Dräger Polytron Pulsar Alignment Kit, ATEX/CSA
2350326 Adapter AI500 to HHT or PC
2350327 Dräger Polytron Pulsar PC Software with cable (supports Dräger Polytron Pulsar, AI500 and HHT)
2350238 Data wand for AI500
2350339 Attenuator plate AP800
2350322 Dräger Polytron Pulsar Remote Junction Box/HHT Kit
2350405 Set of 6 U Bolt fixings (CSA & UL Dräger Polytron Pulsar)
2350451 Gas test sheets (Dräger Polytron Pulsar Duct Mount)
2350505 Dräger Polytron Pulsar Alignment Telescope
2350519 Dräger Polytron Pulsar Alignment Kit, ATEX/CSA (Ethylene Dräger Polytron Pulsar only)
2350520 Gas test sheets (Ethylene)
2350521 Gas test sheets (set of 5, spares for p/n 2350325)
4208729 Desert Modification Kit

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Title Size
Polytron Pulsar Datasheet 857 KB
Polytron Pulsar Duct Mount 902 KB
Polytron-Pulsar-Manual 687 KB

Additional information

Weight 0.09 kg