Draeger Polytron Pulsar 2

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The Dräger Polytron Pulsar 2 is the latest infrared technology in open path gas detection. Equipped with all the same functions as the standard Dräger Pulsar, Dräger Pulsar 2 is fitted with an ABS moulded cover and is supplied with either a junction box or certified connector to provide complete flexibility during installation.

Dräger Pulsar 2 is 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 special training or skills. After an initial coarse adjustment by eye, a hand held 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 Dräger 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 parameters about alignment and signal strength are logged and will be used to determine any future misalignment or build up of deposits on the optical lenses.


Increased Performance - Continuous communication between Receiver and Transmitter across a signal line allows the system to adapt to difficult environmental conditions and ensure highest availability. The high power xenon lamps combined with a sophisticated algorithm which varies their intensity and frequency makes the Dräger 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 along with a reduced response time.


Failsafe - The detector is designed so that no fault can go undetected. In normal operation the output signal is 4 to 20 mA, depending on the gas concentration measured. Whereas a signal of < 1 mA indicates a fault and a signal of 2 mA indicates a beam blockage. In addition a continuous selftest 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 Dräger Polytron Pulsar carries a Safety Integrity Level rating of 2 (SIL 2).

Heated Optics - Controlled internal heating of the optical lenses prevent the formation of ice and build up of snow 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 7 days of operation, and consolidated records for the previous 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.

Draeger Polytron Pulsar with HART - HART capabilities within the Dräger Polytron Pulsar can provide digital communications between the field and the safe area. This can provide real time information on the status of an individual detector as well as configuration and historical data of each device, without the need for extra cable cores.

Complete Access from the Safe Area - Installing an AI500 digital interface provides digital data on the status of the detec tor and also allows configurations such as gas calibration and 4 to 20mA span to be altered without physically connecting to the Receiver in the  hazardous area. For larger installations a maximum of 32 AI500 units may be connected via an RS485 multidrop allowing up to 128 Dräger Polytron Pulsars to be monitored – valuable for scheduling service and maintenance.


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 are field selectable by the user.


Worldwide Approvals - The Dräger Polytron Pulsar can be used worldwide with the following approvals: ATEX, IECEx, UL, CSA and GOST.


The Hand Held Terminal - The hand held terminal (HHT) is a robust weatherproof unit, certified for use in a hazardous, classified area. The terminal is used to align and zero the Dräger Polytron Pulsar transmitter and receiver, and to provide configuration and diagnostic functions. More comprehensive diagnostics are provided in conjunction with the Dräger Polytron Pulsar PC software and a personal computer located in the non-hazardous area, when using the AI500 digital interface.

Technical Data