The Dräger Pulsar 7700/7900 is a stationary open-path gas detector that can detect potentially explosive hydrocarbons like methane and propane from up to 200 meters away within two seconds. It has a robust stainless steel design and fast-responding sensor that make it reliable for use in the oil, gas, and chemical industries. The system includes a transmitter that emits a signal, a receiver that detects the signal, and accessories like a weather guard and handheld terminal for alignment and diagnostics. It provides reliable detection even in adverse weather and can continuously self-test for safety.

1. Dräger Pulsar 7700/7900
Detection of flammable gases and vapour
The Dräger Pulsar 7700/7900 is a stationary open-path gas detector for
detecting potentially explosive hydrocarbons in gases and vapours. Its
robust design and the extremely short response time of its sensor make
the Dräger Pulsar 7700/7900 a reliable solution for challenges in the oil
and gas and chemicals industries.
D-7358-2016
Stainless Steel Wheather Guard
Cardan Mounting Bracket
for Alignment
Intrinsically Port for Handterminal
Stainless Steel Mounting Plate
Junction Box EX e

2. Benefits
02 | Dräger Pulsar 7700/7900
Reliable and fast measurement
The Pulsar 7700/7900 detects a wide range of gaseous hydrocarbons, including methane, propane and also
ethylene. An accumulation of these gases in critical concentrations can be measured at a distance of up to
200 metres within two seconds. This is achieved by the flashing frequency, which increases in strong mode.
Status LEDs in the transmitter and receiver indicate even over a larger distance that the device is ready to
operate. The Pulsar 7700/7900 also runs continual self-tests for additional safety and reliability. If the signal
strength is insufficient, the transmitter sends out a freely configurable pre-warning signal. The system continues
to detect gases whilst sending additional warning signal indicating that maintenance is required, for example
because a lens has become dirty. This makes it possible to plan maintenance in advance and avoid unexpected
downtimes. The Pulsar 7700/7900 is suitable for safety-related technical applications up to SIL 2.
Reliable even in adverse weather conditions
Reliability is not just ensured in ideal weather conditions. The Pulsar 7700/7900 uses strong mode to
compensate for increased absorption of the signal intensity by fog, mist, heavy rain or snow. Lens heating also
prevents the accumulation of snow and condensation on the lens.
Easy alignment, configuration and commissioning
It takes just one person to align the transmitter and receiver and then commission the system – the process is
simple and does not require additional telescopic or alignment mirrors. Once the transmitter and receiver are
roughly lined up by sight, a handheld terminal is used to achieve precise alignment. The terminal displays the
alignment either in a coordinate system with crosshairs or as numerical coordinates. The integrated calibration
function of the Pulsar 7700/7900 does not require 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 saved and then used later to detect any misalignments or
accumulation on the lenses.
On-site diagnostics
The handheld terminal can be used for preventative maintenance and any fault diagnostics on site. In addition
to support alignment and zeroing, the handheld terminal also has configuration and diagnostic functions. More
comprehensive diagnostics are possible with the Dräger PolySoft PC software.
Documented safety – integrated data logger and log report
An integrated data logger saves the most recent errors, warnings and events. These include events such
as beam blocks, gas alarms, warning signals and alignment and supply voltage problems. Alongside the
data logger, there is also a summary log report that provides the values measured within an hour. The report
contains important information, such as the measured gas value, signal strength and temperature.
This data is available for the last ten weeks of operation. Information is also provided as a weekly summary from
the last ten years of operation.

3. System Components
Dräger Pulsar 7700/7900 | 03
D-6806-2016
Dräger REGARD® 7000
The Dräger REGARD® 7000 is a modular and therefore highly
expandable analysis system for monitoring various gases and vapours.
Suitable for gas warning systems with various levels of complexity and
numbers of transmitters, the Dräger REGARD® 7000 also features
exceptional reliability and efficiency. An additional benefit is the
backward compatibility with the REGARD®.
D-27777-2009
Dräger REGARD® 3900
The Dräger REGARD® 3900 is a standalone, self contained control
system for the detection of Toxic, Oxygen and Ex hazards. The control
system is fully configurable between 1 and 16 channels, depending upon
the type and quantity of input/output boards installed.
Accessories
Weather guard
Weather guard protects the system from adverse weather conditions,
such as snow and rain. It is made of stainless steel 316 (including for
each Pulsar 7700/7900 transmitter and receiver).

4. Accessories
04 | Dräger Pulsar 7700/7900
PIA – Pulsar interface adapter
The Dräger Pulsar interface adapter (PIA) is robust, weatherproof
and certified for hazard zones. The PIA provides two interfaces for
communication with the Pulsar 7700/7900 through its intrinsically safe
connection. Combined with a HART® handheld terminal or PC with
PolySoft, it acts as a protocol converter via the IR interface to align and
calibrate Pulsar transmitters and receivers. It also has configuration/
diagnostic options.
ST-977-2001
Handheld terminal
The handheld terminal from Dräger is a robust, weatherproof device
approved for use in potentially explosive atmospheres. The terminal is
used to align and zero the Dräger Pulsar transmitter and receiver. It also
offers basic configuration and diagnostic functions.
ST-3531-2003
AI 500 and adapter cable
The digital AI 500 interface is used to provide extensive diagnostic data
when connected with the Dräger Polytron PC software and a PC in
the non-potentially explosive zone. Up to four Pulsar systems can be
connected via this interface.

5. Related Products
Dräger Pulsar 7700/7900 | 05
ST-11659-2007
Dräger PIR 7000
The Dräger PIR 7000 is an explosion proof point infrared gas detector
for continuous monitoring of flammable gases and vapours. With its
stainless steel SS 316L enclosure and drift-free optics this detector is
built for the harshest industrial environments, e.g. offshore installations.

6. Technical Data
06 | Dräger Pulsar 7700/7900
Type Explosion-proof open-path gas detector with dual wavelength infrared absorption
Gases Wide range of hydrocarbons including the alkane series from methane to hexane, propylene, ethanol
and methanol
Measurement range Min. 0 to 4 LEL-m, max. 0 to 8 LEL-m
Factory calibration Methane or propane, selectable; other hydrocarbons available upon request
Operating range 4 to 60 m, 30 to 120 m or 100 to 200 m (distance between transmitter and receiver)
Measurement 4 to 20 mA
Pre-warning 3.5 mA (dirty lens or
misalignment)
Beam block warning 2 mA
Signal output Analogue
Error < 1 mA
Power consumption < 5 W receiver, < 9 W transmitter
Response time t90 < 2 s (when using the digital link)
Temperature -40 to + 60°C, -40 to + 140°F
Pressure 800 to 1,100 hPa
Ambient conditions
Air humidity 0 to 100% rel. humidity, non-condensing
Material Stainless steel
Degree of protection IP66/IP67
170 x 370 x 350 mmDimensions (W x H x D,
approx.) 640 x 420 x 200 mm (incl. cable bend)
Housing
Weight (approx.) 10 kg, incl. mounting plate and weather protection
Ex II 2 (1) GD
Ex db[ia Ga] IIC T6/T5 Gb
Ex tb IIIC T80 °C Db IP67 IP66
ATEX / IECEx
Tamb= -55°C/-40°C to +40°C/+60°C *
Intended marking
Class I, Div. 1, Group C, D
Class II, Div. 1, Group E, F, G, H
UL / CSA (pending)
Type rating: 4X
DNV (Tamb: -40°C to +60°C) Temperature Class D; Vibration Class A+C
Approvals
SIL SIL 2 certification from TÜV Nord
* -40 °C only applies to offshore/heavy duty versions
HART® is a registered trademark of the HART® Communication Foundation
Ordering Information
Dräger Pulsar 7xx0 Ex e
Dräger Pulsar 7000 Tx S Range JB Ex e 68 51 700
Dräger Pulsar 7000 Tx L Range JB Ex e 68 51 701
Dräger Pulsar 7700 Rx S Range JB Ex e 68 51 702
Dräger Pulsar 7700 Rx L Range JB Ex e 68 51 703
Dräger Pulsar 7000 Tx S Range JB Ex e Ho 68 51 706
Dräger Pulsar 7000 Tx L Range JB Ex e Ho 68 51 707
Dräger Pulsar 7700 Rx S Range JB Ex e Ho 68 51 708
Dräger Pulsar 7900 Rx S Range JB Ex e 68 51 710
Dräger Pulsar 7900 Rx L Range JB Ex e 68 51 711
Dräger Pulsar 7900 Rx S Range JB Ex e Ho 68 51 714
Dräger Pulsar 7000 Tx S Range JB Ex e SS** 68 51 718
Dräger Pulsar 7000 Tx L Range JB Ex e SS** 68 51 719
Dräger Pulsar 7700 Rx S Range JB Ex e SS** 68 51 720

7. Ordering Information
Dräger Pulsar 7700/7900 | 07
Dräger Pulsar 7700 Rx L Range JB Ex e SS** 68 51 721
** Offshore/heavy duty version
Dräger Pulsar 7xx0 Ex d
Dräger Pulsar 7000 Tx S Range JB Ex d 68 51 722
Dräger Pulsar 7000 Tx L Range JB Ex d 68 51 723
Dräger Pulsar 7700 Rx S Range JB Ex d 68 51 724
Dräger Pulsar 7700 Rx L Range JB Ex d 68 51 725
Dräger Pulsar 7000 Tx S Range JB Ex d Ho 68 51 728
Dräger Pulsar 7000 Tx L Range JB Ex d Ho 68 51 729
Dräger Pulsar 7700 Rx S Range JB Ex d Ho 68 51 730
Dräger Pulsar 7900 Rx S Range JB Ex d 68 51 732
Dräger Pulsar 7900 Rx L Range JB Ex d 68 51 733
Dräger Pulsar 7900 Rx S Range JB Ex d Ho 68 51 736
Accessories
Dräger Pulsar 2" pipe mount kit (for 50 mm) 23 07 003
Dräger Pulsar PC connection cable 23 07 021
Lens cleaner LCF01 23 50 291
Set of 4 U bolt pipe fixings for 150 mm / 5.9" diameter pipe 23 50 302
AI 500 digital interface 23 50 306
Dräger Pulsar remote HHT kit 23 50 322
Dräger Pulsar alignment kit ATEX/CSA (methane) 23 50 325
Dräger Pulsar alignment kit ATEX/CSA (ethylene) 23 50 519
Gas test film kit (Pulsar – ethylene) 23 50 520
Gas test film kit (Pulsar – methane) 23 50 521
Dräger Pulsar 7700 alignment kit with PIA 68 51 630
Dräger Pulsar 7900 alignment kit with PIA – ethylene 68 51 631
AI 500 adapter PC/handheld terminal 23 50 326
Attenuator plate AP800 23 50 339
Dräger Pulsar alignment telescope 23 50 505
Gas cell kit, single pass, propane 23 50 514
Gas cell kit, single pass, methane 23 50 516
Gas cell kit, single pass, methane & propane 23 50 518

8. Notes
08 | Dräger Pulsar 7700/7900
Not all products, features, or services are for sale in all countries.
Mentioned Trademarks are only registered in certain countries and not necessarily in the country
in which this material is released. Go to www.draeger.com/trademarks to find the current status.
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