Dräger Polytron Pulsar 2 User manual

WARNING
You must read, understand, and comply with this Technical
Manual before you use the gas detector in order to ensure
the proper operation and function of the gas detector.
!
Dräger Polytron Pulsar 2
Open Path Gas Detector
Technical Manual
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Content
Dräger Polytron Pulsar 2 3
Content
1 For your safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
3 Parts supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
4 Understanding the system . . . . . . . . . . . . . . . . . . . .5
5 Installation of a
Dräger Polytron Pulsar 2 . . . . . . . . . . . . . . . . . . . . . .7
6 Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . .9
7 Cabling the Ex d certified connector . . . . . . . . . . . .13
8 Installing and commissioning the Dräger Polytron
Pulsar 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
9 Planned maintenance . . . . . . . . . . . . . . . . . . . . . . .19
10 Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
11 Receiver default settings . . . . . . . . . . . . . . . . . . . . .21
12 Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
13 Accessories list . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
14 Fault finding guide . . . . . . . . . . . . . . . . . . . . . . . . . .24
15 The Dräger Hand Held Terminal . . . . . . . . . . . . . . .27
16 The Dräger Polytron Pulsar 2 Digital
Interface AI500 . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
17 Using the Dräger Polytron Pulsar 2 with HART . . .34
18 AMS operator screens and help texts . . . . . . . . . . .35
19 Declaration of Conformity . . . . . . . . . . . . . . . . . . . .46

4Dräger Polytron Pulsar 2
For your safety
1 For your safety
1.1 General safety statements
Strictly follow this Technical Manual
Any use of the device requires full understanding and strict
observation of this Technical Manual and the Instructions for
Use provided with the device. The device is only to be used for
the purposes specified herein and in the Instructions for Use.
Maintenance
The device must be inspected and serviced by experts at
regular intervals and a record kept. Repair and general
overhaul of the device may only be carried out by trained
service personnel. We recommend that a service contract be
obtained with Dräger for all repairs. Only authentic Dräger
spare parts may be used for maintenance.
Observe the chapter “Maintenance“.
Use in areas subject to explosion hazards
Equipment and components which are used in explosion-
hazard areas and which have been inspected and approved in
accordance with International or European explosion-
protection regulations may be used only under the specified
conditions. The equipment or components may not be
modified in any manner.
1.2 Definitions of alert icons
The following alert icons are used in this document to provide
and highlight areas of the associated text that require a greater
awareness by the user. A definition of the meaning of each
icon is as follows:
2 Intended use
2.1 Dräger Polytron Pulsar 2 open path gas
detector
For stationary, continuous monitoring of hydrocarbon gases or
vapours that may present an explosion hazard.
2.2 Explosion protection approvals
The explosion-protection approvals are valid for use of the
device in gas/vapour-air mixture of combustible gases and
vapours under atmospheric conditions. The explosion-
protection approvals are not valid for use in oxygen enriched
atmospheres. In case of unauthorised opening of the
enclosure, the explosion-protection approval is voided.
European Certification
ATEX Certificate number SIRA 00ATEX1175
ATEX: II 2 GD
Ex d[ia] IIC T5 (Tamb -40 °C to +60 °C)
Ex d[ia] IIC T6 (Tamb -40 °C to +40 °C)
International Certification
IEC Ex Certificate number IEC Ex SIR 04.0006
IEC Ex:
Ex d[ia] IIC T5 (Tamb = -40 °C to +60 °C)
Ex d[ia] IIC T6 (Tamb = -40 °C to +40 °C)
FM/ANSI
FM ANSI/FM 6325
ANSI/ISA-12.13-04
Tested to IEC 60079-29-4
(conducted by FM Approvals)
DNV Certification
(Cert.-No. A-12526)
WARNING
The Draeger Polytron Pulsar 2 has no user-
serviceable parts. Unauthorised opening can lead to a
safety related failure of the unit.
DANGER
Indicates an imminently hazardous situation which, if
not avoided, will result in death or serious injury.
WARNING
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which, if not
avoided, could result in physical injury, or damage to
the product or environment. It may also be used to
alert against unsafe practices.
NOTICE
Indicates additional information on how to use the
product.
!
!
!
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NOTICE
The Dräger Polytron Pulsar 2 is one of the family of de-
tectors certified under the designation GD8. All certifi-
cates will refer to the GD8
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Parts supplied
Dräger Polytron Pulsar 2 5
3 Parts supplied
1 The Dräger Polytron Pulsar 2 detector comes in two parts
a Transmitter and a Receiver; each supplied with an ABS
moulded cover. Additionally the detector is supplied with
either:
{Flying leads and Ex e junction boxes.
{Ex d certified plugs and sockets.
2 An Optical Attenuator for use on beam paths between 4
and 16 metres, NOTE this is only supplied with 4-60m
Transmitters.
3 An installation sheet and a quick start guide are supplied
with the detector. Installation/operation manuals are also
available through local distributors or by contacting Dräger.
4 You will also require a Commissioning kit which is ordered
separately and includes:
{Dräger Hand Held Terminal (HHT)
{4mm Allen key
{Test Sheets
{HHT PC software
{PC Cable (HHT version)
4 Understanding the system
4.1 Introduction
The Dräger Polytron Pulsar 2 detects hazardous releases of
flammable hydrocarbons using the open path technique. The
Dräger Polytron Pulsar 2 it adds new and unique features
which overcome common problems and annoyances in
practical installations.
A Transmitter sends a beam of infrared light through the air to
a Receiver. A release of hydrocarbon gases anywhere along
the beam is detected because they absorb particular infrared
wavelengths. Rain or snow in the air and dirt on the lenses do
not cause a false indication of gas because they do not share
the same characteristic wavelengths selectively. This 'open
path' technique can achieve a density of coverage and a speed
of response that would otherwise require an extensive array of
point detectors. The new features that Dräger Polytron
Pulsar 2 adds includes the following:
1 The light is produced by pulsed eye-safe sources with a
peak power of 30kW. With this high Transmitter power, the
Receiver is made immune from sunlight and resonance
effects associated with vibration from rotating machinery.
Having more than one source ensures that, in the unlikely
event of a failure, the system remains functional until the
Transmitter can be exchanged.
2 The performance of all open path instruments depends on
the accurate aiming of the Transmitter and Receiver
towards each other. Often the necessary detection paths
require elevated and inaccessible locations. This can make
the alignment difficult to do at the time of installation, and
difficult to check subsequently when the supporting
structures may have moved. The Dräger Polytron Pulsar 2
has internal sensors to measure the orientation of the
Transmitter with respect to the Receiver, and vice versa.
Besides being shown graphically on the Dräger Hand Held
Terminal to make installation simple, the directional
measurements are available remotely during normal
operation, allowing the alignment to be checked.
This feature also generates a pre-warning of changes in
alignment before they can affect normal operation, and
prevents a detector being commissioned before it is
correctly aligned.
3 There is a communication path for digital signals from the
Receiver to the Transmitter. The Receiver can command
the Transmitter to double its power and to increase the
flash rate from 1Hz to 4Hz, allowing an eight-fold increase
in light flux when visibility is reduced by bad weather or
(most importantly) by the mist of condensate often present
in real incidents. The higher flash rate is also triggered by
the first indication of gas, allowing a validated gas reading
to be output in a reduced response time. The link also
allows the alignment display for both Transmitter and
Receiver to be viewed at both locations, making it easy for
one person to install or maintain the system.
4 Open path instruments can suffer interference if a receiver
'sees' another transmitter mounted nearby or in line with
the intended one. The Dräger Polytron Pulsar 2 can be
switched to separate frequencies analogous to radio
channels. Each Receiver locks onto its own Transmitter
and ignores light from its neighbours.
5 The Receiver incorporates a data-logger with a non-volatile
memory, readable locally or remotely. The data provides a
valuable aid for diagnosing practical problems and
preventing unnecessary maintenance work. Internally the
information is used to monitor slow trends of signal
strength and provide a pre-warning signal when the lenses
will require cleaning, unaffected by temporary weather
conditions.
In addition to these electronic enhancements, Dräger
Polytron Pulsar 2 has a mechanical design that provides
exceptional stability and ease of adjustment. The head units
containing the optical components are mounted in lockable
gimbals that allow separate vertical and horizontal adjustments
with the other axis clamped. Each axis can be adjusted with a
controlled degree of friction provided by PTFE rings then
locked solid without disturbing the setting. An ABS moulded
cover provides mechanical protection and helps minimise the
temperature rise of the internal electronics.
4.2 Transmitter
The Transmitter is a three-wire device, with cable terminals for
(i) 24Vdc power; (ii) digital communication; and (iii) power and
signal common. The connector for the Dräger Hand Held
Terminal allows data coming from the Receiver to be viewed at
the Transmitter, including the graphical display of orientation
and signal strength needed for alignment. The Dräger Hand
Held Terminal can also configure the Transmitter with its
operating channel and a user-entered tag reference. The eye-
safe optical output through the (electrically heated) Transmitter
lens is mainly infrared, although a controlled amount of deep
red light is visible. An Attenuator Plate is fitted over the lens for
operating distances below 16m. A central section in the plate
is removed for distances between 8 and 16m, retained for
distances between 4 and 8m.
There are five operating modes:
1Normal Mode. Flashes of normal intensity are output once
a second. The flash rate appears regular to the eye,
although it is phase-coded to send directional information
to the Receiver. Occasionally a flash will be seen out of the
normal sequence as part of an internal self-test cycle.
2Strong Mode. Flashes of increased intensity are output at
a regular 4Hz rate.
3Alignment Mode. Flashes of normal intensity are output
four times a second. It is easily distinguishable from Strong
Mode because there is a noticeable irregularity to the flash
rate as it sends directional information to the Receiver.

6Dräger Polytron Pulsar 2
Understanding the system
4Low-supply Mode. Flashes of increased intensity are
output at a regular 2Hz rate. This is substituted for
Alignment Mode if the Transmitter detects that the supply
voltage dips below the specified range when tested with
the lens heater on. This test is only carried out during
alignment (and hence at the time of commissioning the
detector) so that it cannot delay a gas alarm if this
coincides with a deteriorating supply.
5Fault Mode. Flashes of maximum intensity are output at a
regular 1Hz rate. This is substituted for Normal Mode if the
Transmitter has detected that a tube has failed or is
intermittent. It is also the way the Transmitter signals to the
Receiver that the link between them has been broken.
Visually it is not distinguishable from Normal Mode, but is
detected by the Receiver to provide warning signals.
4.3 Receiver
The Receiver is a four-wire device, with cable terminals for (i)
24Vdc power; (ii) analogue current loop; (iii) digital
communication; and (iv) power and signal common. The
analogue output provides fully linearised 4-20 mA gas
readings and configurable warning signals. It can be used in
both current-source and current-sink circuits. The digital line
supplies the signals to switch the Transmitter mode and can
optionally be routed to the non-hazardous area to provide two-
way digital communications with the AI500 interface. Like the
Transmitter, the Receiver has both an electrically heated lens
and a port for the Dräger Hand Held Terminal, providing a clear
display of present readings and the ability to alter the Dräger
Polytron Pulsar 2’s configuration, operating channel, and tag
reference. For more detail about the facilities offered by the
AI500 and the Dräger Hand Held Terminal please see 'Digital
Communications' below and the Appendices.
The data logger in the Receiver maintains a non-volatile record
for the previous seven days of operation, with consolidated
records for the previous 32 weeks. These logs include such
essential information as supply voltage, internal temperature,
signal strength and Transmitter and Receiver alignment.
Dräger software is available which interprets and displays the
logged data on a PC running under MS Windows. When used
in conjunction with the AI500 interface the software allows a
permanent archive of the detailed version to be kept on disk.
The disk record will be continuous provided the Receiver log is
interrogated at least once per week.
4.4 Digital communications
Dräger Polytron Pulsar 2’s comprehensive digital information
can be made available by different routes to suit the level of
complexity required. In the simplest installations only the 4
20mA analogue signal is brought to the non-hazardous area.
Then a pre-warning condition (such as dirty lenses or
misalignment, before they cause a loss of operation) is
signalled as a DC level, configurable to be either above or
below 4mA. For instance, the Regard Optical Card shows
'WARN' and energises a relay for the default 3.5mA setting.
Thus alerted, the user connects the Dräger Hand Held
Terminal to the Receiver head. Present readings are displayed
on its screen, while past data can be downloaded into the
Terminal's internal memory and hence transferred to a
computer in the non-hazardous area. Similarly, changes to the
configuration settings which affect safety can be entered (with
password protection) into the Dräger software running on the
PC and the resulting configuration file carried to the Dräger
Polytron Pulsar 2 in the hazardous area.
A new feature with Dräger Polytron Pulsar 2 allows HART
signals to be superimposed on the 4 20mA wire without
affecting the normal analogue functions. Installations that
include a HART multiplexer in the non-hazardous area provide
much of Polytron Pulsar 2’s digital capability in a way that is
compatible with HART-enabled point detectors. Typically the
multiplexer is interfaced to a central computer running the
Asset Management System (AMS) from Emerson Process
Management which communicates with both types of detector
interchangeably.
The next simplest category of installation brings the single
digital wire from the Receiver into the non-hazardous area,
augmenting the basic measurement carried by the 4 20mA
loop. The full array of digital information is made available by
the AI500 interface, a small unit mounted on a DIN/EN rail with
terminals for up to four Dräger Polytron Pulsar 2s. A separate
connector for the Dräger Hand Held Terminal allows a user to
'call up' any of the four Dräger Polytron Pulsar 2’s Receivers,
read their measured data, change their configurations, and
download their logs; all as if he had gone to the Dräger
Polytron Pulsar 2s themselves. The AI500 also has an infrared
data output which enables a standard notebook PC to capture
the measured data and logs using the Data Wand DW100.
This method is non-contacting and allows the data be taken
with no possibility of affecting the safe operation of the system.
Finally, the most comprehensive class of installations has up to
32 AI500 interfaces linked to a PC or other central system via
an EIA RS 485 multidrop. Dräger software running on the PC
addresses the total system of up to 128 Dräger
Polytron Pulsar 2s, providing full current and historical
information and the ability to configure each detector
individually.
4.5 Gas calibration and zeroing
Dräger Polytron Pulsar 2 is sensitive to a wide range of
gaseous hydrocarbons, including the Alkane series from
Methane to Hexane. In contrast to instruments working at 3.4
µm, the difference in response to different Alkanes is relatively
small, of the order of ±30%. The Receiver has provision for up
to four factory-installed tables providing the calibration and
linearisation for specified gases or gas mixtures. The choice of
which table is used is configurable by the user. For most
applications a Methane table should be selected for mixtures
that are predominantly Methane, a Propane table otherwise.
There is also a factory-installed option for the Receiver to be
optimised for the detection of Ethylene (ethene).
Unlike conventional detectors Dräger Polytron Pulsar 2’s built-
in calibrations need no manual adjustment, but a self-zeroing
sequence is initiated by the Dräger Hand Held Terminal to
complete the commissioning of the detector. The Receiver
checks its own and the Transmitter's alignment, and checks
and records the signal strength. The zeroing can only be
completed if all the checks are passed, and until then a new
detector reads full scale and is not useable. The recorded
signal strength is used as a reference to detect a loss of signal
as the lenses become dirty. For this reason the zeroing should
be carried out in clear conditions, at moderate temperature,
and without the beam being interrupted. A Polytron Pulsar 2
should always be re-zeroed whenever it is re-sited, cleaned or
re-aligned.
The Calibration Certificate supplied with each Dräger
Polytron Pulsar 2 states the lower explosive limit (LEL) 1or
lower flammable limit (LFL) value that was used for each gas.
Normally this is to IEC 61779-1 for Dräger Polytron Pulsar 2s
supplied with an ATEX certification, or values published by the
American National Institute for Occupational Safety and Health
(NIOSH) for those with North American and Canadian
1 Within this Technical Manual the terms LEL and LFL are inter-
changeable and refer to the volume ratio of flammable gas in air
below which an explosive atmosphere will not form.

Installation of a Dräger Polytron Pulsar 2
Dräger Polytron Pulsar 2 7
certifications. The choice of standard used for the factory
calibration can be varied to special order.
Generally, the relatively small differences in the values
between the calibration standards is of less consequence for
open path instruments than for point detectors, since they do
not normally measure gas concentration directly but with a
weighting according to the size of a spreading gas cloud.
Arising naturally from the way they work, all 'line of sight'
detectors measure the total quantity of gas that the beam
intercepts. A flammable gas detector reads the concentration
in LEL times the length of path that the gas occupies (usually
less than the whole Transmitter-Receiver path), making the
appropriate units for the measurement LEL metres (LELm).
The only exception is when a uniform concentration
completely fills a path of defined length, allowing a true
measurement of concentration and the appropriate units to be
%LEL as for the Duct-Mounted Dräger Polytron Pulsar 2 (see
separate manual).
Each of Dräger Polytron Pulsar 2’s linearisation tables covers
the range 0 to 8 LELm and this full range of measurement is
always available in the digital data stream. The user can
configure the span of the 4-20 mA output to any value between
0 4 LELm and 0 8 LELm. Note that a choice other than 0
8LELm does not alter the underlying measurement, but
causes readings between the chosen full scale and 8 LELm to
be clamped at 20mA.
The installation kit includes plastic test sheets which mimic the
infrared absorption of the gases to be detected. They are not
used for calibration but provide a convenient check that the
detector retains its factory-set calibration and is working
correctly. The sheets are marked with their thickness in
micrometres (eg 070 = 0.070 mm). The Dräger
Polytron Pulsar 2’s Calibration Certificate includes its
response to similar sheets at the factory. Note that different
sheets, each of an appropriate plastic film, are used for the
standard Dräger Polytron Pulsar 2 and for the Ethylene
(ethene ) optimised version.
5 Installation of a
Dräger Polytron Pulsar 2
5.1 Choosing the path of the beam
1 The siting of an open path gas detector is often not as
critical as a point detector, since the released gas only has
to find its way into some portion of the beam instead of to
a particular point. However siting is still an important
consideration. Guidance for siting is contained in EN
60079-29-2.
2 Dräger Polytron Pulsar 2 is immune to sunlight so there is
no need to take account of the sun position when siting
detectors.
3 The density of the gas to be detected has to be considered.
Methane is lighter than air and may be expected to rise,
unless released at a low temperature or in a mixture with a
heavier gas like Carbon Dioxide. Likewise heavier
hydrocarbons may be expected to fall. However such
simple considerations as buoyancy may not be a reliable
indicator of gas movement in practical situations. Gas
leaking from high-pressure systems entrains with it a much
larger volume of ambient air, forming a mixture that may be
flammable and almost neutrally buoyant. In these
circumstances it is the natural air currents or forced
ventilation that control the motion of the plume or cloud.
Where air movements are unpredictable it may be
necessary to use separate beam paths to cover different
possibilities.
4 The distance between the Transmitter and Receiver should
agree with the model selected (i.e. 4-60m, 30-120m or 100-
200m). Note that the Optical Attenuator should be fitted
below 16 metres.
5 The beam path and immediate surround should be kept
free of obstructions that might hinder the free movement of
air in the protected area or block the infrared beam. A clear
path of 25cm diameter or greater is recommended. For
maximum availability it is also recommended to avoid the
following:
{Smoke stacks, chimneys and exhausts.
{Steam vents and plumes.
{Walkways and areas where personnel muster or col-
lect.
{Splash and spray from moving equipment and cooling
towers etc.
{Parking, loading, cranes, vehicle temporary stops.
{Vegetation that may grow tall enough to impinge on the
path especially with movement by the wind.
{Surfaces that may obstruct the beam path with a build
up of ice or snow.
5.2 Mounting the unit
The Dräger Polytron Pulsar 2 should be mounted to a stable
structure free of excessive vibration. Good choices would be a
steel bulkhead, brick wall, concrete lamppost or a rigid steel
structure. Avoid flimsy metal structures that may flex, or
wooden structures that may warp. In open areas a suitable
structure close to the ground would consist of a five inch
nominal (141mm outside diameter) steel pipe driven 1 metre
into firm ground or embedded into a concrete foundation. Tall
structures should be suitably guyed or braced.

8Dräger Polytron Pulsar 2
Installation of a Dräger Polytron Pulsar 2
Figure 1: Wall mounting of Dräger Polytron Pulsar 2 with Ex e junction box
Figure 2: Wall mounting of Dräger Polytron Pulsar 2 with eX link plug and socket
For opposite hand mounting (see figure 1 and 2)
1. Remove front cover annd screws (if supplied).
2. Remove Gimbal Clamps.
3. Reverse the Detector taking care not to kink cable and refit the Gimbal Clamps.
4. Refit the cover.
Locking screws for
vertical adjustment.
Locking screws for
horizontal adjustment.
Mounting bolts M8 max.
Terminal Box fixing bolts
Terminal Box cover bolts.
DO NOT OPEN WHEN ENERGISED
Front cover fitted
Electrical connection via M20 certified
Ex e cable glands - not supplied.
For connection options refer to figure 4, 5 and 6.
Factory fitted Ex e
certified cable gland
for Power/Signal cable
Gimbal Clamps
Rear cover
Minimum bend diameter
= 6 x cable diameter
FRONT VIEW SIDE VIEW
Front cover removed
71
338
155
258
216
00223892.eps
Rigid mounting surface. Flat to within ± 3.5mm over rear cover area
Locking screws for
vertical adjustment.
Locking screws for
horizontal adjustment.
Mounting bolts M8 max.
Gimbal Clamps
Rear cover
Front cover fitted
FRONT VIEW
216
Rigid mounting surface. Flat to within ± 3.5mm over rear cover area
SIDE VIEW
Front cover removed
71
338
155
258
eX Link plug
eX Link socket/coupler
Front cover
fixing screws
00323892.eps

Electrical installation
Dräger Polytron Pulsar 2 9
6 Electrical installation
Field cables specification. The cables are required to supply between 18 and 30V DC at peak current (all lamps and heaters on).
Figure 3 below shows typical values of peak current consumption for Transmitter and Receiver individually. The field cable runs
must comply with local regulations. Please refer to the Tables over for maximum recommended power cable lengths.
6.0.1 Figure 3: Peak current consumption
Tx current consumption
Rx current consumption
Voltage DC
004223952.eps
600
550
500
450
400
350
300
585
336
346
367
378
388
399
420
430
441
451
472 483
462
409
357
571
558 546
535
525 517
509 502 496 492 488 485 484 483
18 19 20 21 22 23 24 25 26 27 28 29 30

10 Dräger Polytron Pulsar 2
Electrical installation
6.1 Dräger Polytron Pulsar 2 maximum
permissible power cable lengths
The following tables give the maximum cable lengths for
differing worst case power supply voltages and core sizes.
In using this information please note that the worst-case
(lowest possible) supply voltage should be used not the
nominal stated.
The lengths stated are determined by the power supply cores.
If cable size and distance become excessive it may be more
economic to install a local power supply. There is no practical
limit on the distance for the signal cables, although the 4-20
mA loop resistance is limited to 500 Ωtotal
Cable run in metres: To both Transmitter AND Receiver
Worst case
supply:
20V 21V 22V 23V 24V 25V 26V...
30V
1 mm2:74 98 123 147 172 197 221
1.5 mm2:111 147 184 221 258 295 332
2.5 mm2:184 246 307 369 430 491 553
4 mm2:295 393 491 590 688 786 885
18 AWG: 61 81 101 121 142 162 182
17 AWG: 77 102 128 153 179 204 230
16 AWG: 96 129 161 193 225 257 289
15 AWG: 122 162 203 243 284 324 365
14 AWG: 153 205 256 307 358 409 460
13 AWG: 193 258 322 387 451 516 580
12 AWG: 244 325 407 488 569 650 732
11 AWG: 308 410 513 615 718 820 923
10 AWG: 388 517 646 776 905 1034 1164
Cable run in metres: To Transmitter only
Worst case
supply:
20V 21V 22V 23V 24V 25V 26V...
30V
1 mm2:114 152 189 227 265 303 341
1.5 mm2:170 227 284 341 398 455 511
2.5 mm2:284 379 473 568 663 758 852
4 mm2:455 606 758 909 1061 1212 1364
18 AWG: 94 125 156 187 218 249 281
17 AWG: 118 157 197 236 275 315 354
16 AWG: 149 198 248 297 347 397 446
15 AWG: 188 250 313 375 438 500 563
14 AWG: 236 315 394 473 552 631 709
13 AWG: 298 398 497 596 696 795 895
12 AWG: 376 501 627 752 877 1003 1128
11 AWG: 474 632 790 948 1106 1265 1423
10 AWG: 598 797 997 1196 1395 1595 1794
Cable run in metres: To Receiver only
Worst case
supply:
20V 21V 22V 23V 24V 25V 26V...
30V
1 mm2:210 280 350 420 490 559 629
1.5 mm2:315 420 524 629 734 839 944
2.5 mm2:524 699 874 1049 1224 1399 1573
4 mm2:839 1119 1399 1678 1958 2238 2517
18 AWG: 173 230 288 345 403 460 518
17 AWG: 218 290 363 435 508 581 653
16 AWG: 275 366 458 549 641 732 824
15 AWG: 346 462 577 692 808 923 1039
14 AWG: 437 582 728 873 1019 1164 1310
13 AWG: 551 734 918 1101 1285 1468 1652
12 AWG: 694 926 1157 1388 1620 1851 2083
11 AWG: 875 1167 1459 1751 2043 2334 2626
10 AWG: 1104 1472 1840 2208 2576 2944 3312

Electrical installation
Dräger Polytron Pulsar 2 11
NOTES:
1 Ensure that voltage specifications for the Dräger
Polytron Pulsar 2 are not exceeded. See “Specifications”
section for further information.
2 When the AI500 Digital Interface is used the capacitance of
the cable(s) linking it to the Dräger Polytron Pulsar 2
should not exceed 100nF (e.g. 1000m of 100pF/m cable).
3 When several Dräger Polytron Pulsar 2’s are mounted
together at a remote location it may be most economic to
mount a local 24VDC power supply in a suitably certified
enclosure.
Cable run in feet: To booth Transmitter AND Receiver
Worst case
supply:
20V 21V 22V 23V 24V 25V 26V...
30V
1 mm2:242 322 403 484 564 645 725
1.5 mm2:363 484 605 725 846 967 1088
2.5 mm2:605 806 1008 1209 1411 1612 1814
4 mm2:967 1290 1612 1935 2257 2580 2902
18 AWG: 199 265 332 398 464 531 597
17 AWG: 251 335 418 502 586 669 753
16 AWG: 317 422 528 633 739 844 950
15 AWG: 399 532 665 798 931 1064 1197
14 AWG: 503 671 839 1007 1174 1342 1510
13 AWG: 635 846 1058 1269 1481 1692 1904
12 AWG: 800 1067 1334 1601 1867 2134 2401
11 AWG: 1009 1346 1682 2018 2355 2691 3027
10 AWG: 1273 1697 2121 2545 2969 3393 3818
Cable run in feet: To Transmitter only
Worst case
supply:
20V 21V 22V 23V 24V 25V 26V...
30V
1 mm2:373 497 621 746 870 994 1118
1.5 mm2:559 746 932 1118 1305 1491 1678
2.5 mm2:932 1243 1553 1864 2175 2485 2796
4 mm2:1491 1988 2485 2983 3480 3977 4474
18 AWG: 307 409 511 614 716 818 921
17 AWG: 387 516 645 774 903 1032 1161
16 AWG: 488 651 813 976 1139 1301 1464
15 AWG: 615 820 1026 1231 1436 1641 1846
14 AWG: 776 1035 1293 1552 1810 2069 2328
13 AWG: 978 1305 1631 1957 2283 2609 2935
12 AWG: 1234 1645 2056 2467 2879 3290 3701
11 AWG: 1556 2074 2593 3112 3630 4149 4667
10 AWG: 1962 2616 3270 3924 4578 5231 5885
Cable run in feet: To Receiver only
Worst case
supply:
20V 21V 22V 23V 24V 25V 26V...
30V
1 mm2:688 918 1147 1377 1606 1835 2065
1.5 mm2:1032 1377 1721 2065 2409 2753 3097
2.5 mm2:1721 2294 2868 3441 4015 4589 5162
4 mm2:2753 3671 4589 5506 6424 7342 8259
18 AWG: 567 755 944 1133 1322 1511 1700
17 AWG: 714 952 1191 1429 1667 1905 2143
16 AWG: 901 1201 1501 1802 2102 2402 2702
15 AWG: 1136 1515 1893 2272 2651 3029 3408
14 AWG: 1432 1910 2387 2865 3342 3820 4297
13 AWG: 1806 2408 3010 3613 4215 4817 5419
12 AWG: 2278 3037 3796 4555 5315 6074 6833
11 AWG: 2872 3830 4787 5744 6702 7659 8616
10 AWG: 3622 4829 6036 7244 8451 9658 10865

12 Dräger Polytron Pulsar 2
Electrical installation
Figure 4: Connection diagram powered via Transmitter
Figure 5: Connection diagram powered via Receiver
1
1
1
2
2
3
3
4
4
5
5
6
6
7
7
S
S
E
E
12
2
3
3
4
4
5
5
6
6
7
7
S
S
E
E
+24V dc
Common
Digital
(see note 5)
0-20mA
To
Control
Equipment
Receiver
terminal box
connections
Transmitter
terminal box
connections
cable
screen
cable
screen
cable
screen
Link Cable
to Transmitter
Link Cable
to Receiver
+24Vdc
+24Vdc 0-20mA
0-20mA Digital
Digital Common
Common
Blanking
Plug
supplied
NOTES:
1) Glands to be Ex e type e.g. Hawke 501/453/UNIV/...
2) Entry points for Link Cable and Control Equipment may be
interchanged provided that the correct connections are maintained.
3) The Transmitter and Receiver assemblies must be securely earthed.
4) It is essential for correct operation that the Digital and Common lines of the Tx and Rx
are interconnected even when they are not connected to external equipment.
5) This core may be omitted if the AI500 Digital Interface is not required.
To
Receiver
head unit
Ex e gland
supplied fitted
To
Transmitter
head unit
CAUTION
This diagram must be followed to ensure correct operation,
whether the installation is in a hazardous area or not.
For safe operation in a hazardous area you must also refer to
the certification documents and comply with all local regulations.
6) does not comply with DNV requirements
00523892.eps
+24V dc
Common
Digital (see note 5)
0-20mA
To
Control
Equipment
Receiver
terminal box
connections
Transmitter
terminal box
connections
cable
screen
cable
screen
+24Vdc
+24Vdc
unused (see note 5)
unused (see note 5)
Digital
Digital
Common
Common
Blanking
Plug
supplied
NOTES:
1) Glands to be Ex e type e.g. Hawke 501/453/UNIV/...
2) Entry points for Link Cable and Control Equipment may be
interchanged provided that the correct connections are maintained.
3) The Transmitter and Receiver assemblies must be securely earthed.
4) It is essential for correct operation that the Digital and Common lines of the Tx and Rx
are interconnected even when they are not connected to external equipment.
5) This core may be omitted if the AI500 Digital Interface is not required.
1
1
2
2
3
3
4
4
5
5
6
6
7
7
S
S
E
E
1
1
2
2
3
3
4
4
5
5
6
6
7
7
S
S
E
E
screen
LINK CABLE
To
Receiver
head unit
Ex e gland
supplied fitted
To
Transmitter
head unit
CAUTION
This diagram must be followed to ensure correct operation,
whether the installation is in a hazardous area or not.
For safe operation in a hazardous area you must also refer to
the certification documents and comply with all local regulations.
6) for DNV compliant installations connect the cable screen one sided to PE on the power supply
00623892.eps

Cabling the Ex d certified connector
Dräger Polytron Pulsar 2 13
Figure 6: Connection diagram powered individually
7 Cabling the Ex d certified
connector
Dräger Polytron Pulsar 2s supplied with the Ex d certified plug
and socket come with the plug fitted to the Dräger
Polytron Pulsar 2 end plate. The socket also supplied, requires
connecting to the field wiring which in turn is then connected to
suitable DC power supply and control equipment. This then
provides the necessary power, signal and digital connections
for the Dräger Polytron Pulsar 2 to operate when the plug and
socket are mated together.
The following instructions give some information on how to
connect field wires to the socket; further information is
available at http://www.ceag.de.
Receiver
terminal box connections
Transmitter
terminal box connections
Blanking
Plug
supplied
Blanking
Plug
supplied
NOTES:
1) Glands to be Ex e type e.g. Hawke 501/453/UNIV/...
2) Entry points may be changed provided that the correct connections
are maintained.
3) The Transmitter and Receiver assemblies must be securely earthed.
4) These connections are typically made in the marshalling cabinet in the
non-hazardous area.
5) It is essential for correct operation that the Digital and Common lines
of the Tx and Rx are interconnected even when they are not connected
to external equipment.
1
1
2
2
3
3
4
4
5
5
6
6
7
7
S
S
E
E
1
1
2
2
3
3
4
4
5
5
6
6
7
7
S
S
E
E
To
Receiver
head unit
Ex e gland
supplied fitted
To
Transmitter
head unit
CAUTION
This diagram must be followed
to ensure correct operation,
whether the installation is in a
hazardous area or not.
For safe operation in a hazardous
area you must also refer to
the certification documents and
comply with all local regulations.
+24V dc
+24V dc
Common
Digital
cable screen
cable screen
0-20mA
(See notes 4 and 5)
Instrument
Earth
Instrument Earth
See note 2
00623892.eps
6) does not comply with DNV requirements
NOTICE
The Dräger Polytron Pulsar 2 Transmitter is a 3 wire
device and the Receiver a 4 wire device.
i
i

14 Dräger Polytron Pulsar 2
Cabling the Ex d certified connector
Figure 7: Exploded view of the socket
7.1 Ex d socket cable specification
The Ex d socket supplied with the Dräger Polytron Pulsar 2
may be used with cables of the following dimensions:
External sheath 12 - 21mm
Internal sheath 8.5 - 16mm
SWA diameter 0 - 1.25mm
Cable core size 1.5 - 2.5mm
7.2 Preparing and fitting the cable
1. Strip and prepare the cable to the required lengths, typical
dimensions are given in Figure 9.
2. Place the socket components (outer cap, thrust washers,
outer seal etc.) onto the cable (see Figure 7), whilst ensur-
ing that the cable armour/braid is fitted between the clamp
cone and sleeve.
3. Fit the contact pins to the cable ends, (ensuring that small
hexagonal collar sits between the cable core and colour
coded bar, see Figure 8)
4. Carefully crimp the pins into position, ensuring that the hex-
agonal collar is not damaged during the process. A crimp-
ing tool is recommended and is available from Dräger or
your local distributor
7.2.1 Figure 8
1 Contact end (connects with plug)
2 Hexagonal collar
3 Crimp end (fit to cable)
4 Colour coded bar
zPush the insulation sleeve over the contact pins, and push
fit each pin into its appropriate location of the socket insert.
See rear socket insert as indicated in Figure 9 for
termination descriptions (e.g. pin 1 = digital, pin 2 = 24V,
pin 3 = 0-20mA, pin 4 = Common).
1 Socket sleeve 2 Outer cap nut
3 Thrust washer 4 Outer seal
5 Inner gland nut 6 Sleeve
7 Clamp cone 8 Inner seal
9 Inner thrust washer 10 Insulation sleeve
11 Contact pins 12 Socket insert
12
10 98765
2
3
4
1
11
00823892.eps
NOTICE
Ithat the -ve core (common) MUST have the large con-
tact pin fitted, the pins are colour coded so that the
large pin is easily distinguishable from the other 3 pins.
i
i
NOTICE
IMPORTANT
It is critical that each pin is fitted to the correct location;
failure to do so may result in damage to the Dräger
Polytron Pulsar 2.
00923892.eps
4
3
2
1
i
i

Cabling the Ex d certified connector
Dräger Polytron Pulsar 2 15
Figure 9: Cable preparation and wiring
The socket insert is now ready to be inserted into the socket sleeve. Ensure that the large contact pin (4) is in the 8 o'clock position
in relation to the location lug (as indicated in fig. 9 front of eXLink socket). Carefully push the socket insert into the sleeve and
ensure that the location lug secures correctly. When fully fitted the insert should protrude by approximately 13mm and although
there is a little movement when attempting to turn the socket insert it should not rotate. If the insert does rotate then it is not fitted
correctly and requires adjustment to secure it into position. Finally secure the remaining components of the socket before
tightening the outer cap nut.
7.3 Connecting the plug and socket
Ensure that the key way is in the correct position; push the socket into the plug. Turn the connector to the right by approximately
30° and then fully insert before screwing the coupling of the socket to the plug in order to establish the IP protection and
mechanical protection. Reverse this process in order to disconnect the plug and socket.
8
30
35
50mm
Pair 1 core to CEAG socket pin 4 (-ve common)
Pair 1 core to CEAG socket pin 1 (digital)
Pair 2 core to CEAG socket pin 3 (4 - 20mA)
Pair 2 core to CEAG socket pin 2 (+ve 24V)
Outer sheath
Steel/wire braid
Protective sleeve
01023892.eps
Front of eXLink socket (insert fitted)
Rear of socket insert
Location lug
Key way
01123892.eps
1
4
2
4
2
3
1
3

16 Dräger Polytron Pulsar 2
Cabling the Ex d certified connector
Figure 10: Connection diagram powered individually using CEAG Ex d connector
01223892.eps
NOTES:
1) The Transmitter and Receiver assemblies must be securely earthed.
2) These connections are typically made in the marshalling cabinet in the non-hazardous area.
3) It is essential for correct operation that the Digital and Common lines of the Tx and Rx
are interconnected even when they are not connected to external equipment.
CAUTION
This diagram must be followed
to ensure correct operation,
whether the installation is in a
hazardous area or not.
For safe operation in a hazardous
area you must also refer to
the certification documents and
comply with all local regulations.
+24V dc
+24V dc
Common
Digital
Digital
Common
0-20mA
(See notes 2 and 3)
Instrument
Earth
Instrument Earth
33
22
11
44
Rear of eXLink
socket
Rear of eXLink
socket
Receiver ConnectionsTransmitter Connections

Installing and commissioning the Dräger Polytron Pulsar 2
Dräger Polytron Pulsar 2 17
8 Installing and commissioning the
Dräger Polytron Pulsar 2
To install the Dräger Polytron Pulsar 2 you require:
{Dräger Polytron Pulsar 2 Transmitter and Receiver.
{Hand Held Terminal (Part of alignment kit).
{4mm Allen key (Part of alignment kit)
{Suitable spanner for fixing. (Not supplied)
{Set of plastic Test Sheets. (Part of alignment kit)
{U bolts if fixing to a pipe. (Supplied if ordered as an ac-
cessory)
{Nominal 24V dc power.
{Where junction boxes are used Three M20 Ex e certi-
fied cable glands if unit is to be powered via Transmitter
or via Receiver.
Two M20 cable glands if unit is to be linked in marshal-
ling/control cabinet. (Not Supplied).
{Attenuator plate if the operating distance is below 16m
{A portable detector to check that the beam path is free
of hydrocarbon gas before zeroing.
1. Carefully unpack the equipment and check the contents of
the boxes against the packing note. In case of shortages or
damage contact the carrier, Dräger or the distributor imme-
diately.
2. Mount the Dräger Polytron Pulsar 2 on a suitable structure,
ensuring that the beam path meets the criteria laid down in
section “Installing The Dräger Polytron Pulsar 2”.
3. Connect the field cables (see Electrical installation section)
and apply power.
4. If the beam path is less than 16m the AP800 attenuator
(see figure 11) must be fitted to the TRANSMITTER. The
attenuator has push out sections depending on the dis-
tance over which the Dräger Polytron Pulsar 2 is to be
used, the inner sections should be removed for beam paths
between 8 and 16m. To fit the attenuator press the three
serrated tabs firmly into recesses in the transmitter lens re-
taining ring.
zDuring the alignment and zeroing procedure the
output from the Dräger Polytron Pulsar 2 will vary
between 0 and 20mA. To avoid false alarms, the alarm
activation at the control device is to be locked.
zThe following sections explain how to commission the
Dräger Polytron Pulsar 2, see “The Dräger Hand Held
Terminal” section for using the Dräger Hand Held
Terminal. Essentially the same steps can be carried
out using the MTL611B Hand Held terminal (based on
a Psion Organiser) that was formerly supplied, or with
a laptop computer, running software supplied by
Dräger. Please refer to the appropriate documentation.
Figure 11: AP800 Attenuator plate (fitted to 4-60 m
Transmitter only)
8.1 Configuring the Transmitter and Receiver
Like two-way radios, the Dräger Polytron Pulsar 2 Transmitter
and Receiver are switchable between different frequency
channels. The Transmitter and Receiver need to be set to the
same channel, chosen to be different from the channels in use
by neighbouring Transmitters. In this case it is only
Transmitters whose light can reach the Receiver, directly or by
reflection, that could cause interference.
Transmitters labelled '4 to 60m' are allocated channels 0 to 7
(factory set to 0); '30 to120m' and '100 to 200m' channels 8 to
11 (factory set to 8).
To set the channel at the Transmitter and Receiver
select in the 'Tx Main Menu' and 'Rx Memory Menu'. At
the same time you have the opportunity to enter an
alphanumeric tag string up to 11 characters long. Although not
required for correct operation of the detector, a meaningful tag
that identifies the location of the Dräger Polytron Pulsar 2 is
strongly recommended. It becomes part of the data logger
records read out in future, allowing their source to be known
explicitly rather than by tracing serial numbers. Likewise, the
tag is available when several Receivers are connected to an
AI500 Digital Interface, and possibly several AI500s connected
in a multidrop, allowing any misrouting of the connections to be
quickly traced.
Other configurable settings in the Receiver (such as the
quantity of gas for full-scale in the 4 20mA current loop,
baseline deadband or auto zero tracking - AZT) are less
frequently changed and are often the same for all Dräger
Polytron Pulsar 2s at the same site. The current values active
in the Receiver can be read by selecting in 'Rx Main
Menu'. A new configuration file can be written from the Hand
Held Terminal with in 'Rx Memory Menu'. To see the
settings that are available to be sent, choose in the 'Not
Connected' menu. To change them, connect the Hand Held to
a computer in the non-hazardous area, go to in the 'Not
Connected' menu, and run the Dräger software supplied.
AZT automatically cancels small deviations of gas reading that
persist for a long time. The rate is set in units of LELm/h.
Baseline deadband is the threshold of gas readings that cause
the analogue output to rise above either 4mA or the Warning
Current. AZT and baseline deadband settings should be
chosen while considering the ambient condition at the point of
installation. In particular in harsh outdoor environments where
a slow increase of gas is not possible, higher AZT and baseline
deadband settings can be chosen. In indoor applications
where small leaks could lead to a slow increase of gas
concentrations, AZT and baseline deadband values must be
kept at a low level. Details see: Receiver default settings.
NOTICE
Only apply the power if you intend to fully commission
the detector at this stage.
i
i
01323892.eps
Fit attenuator to Transmitter
when lens-to-lens distance is 4 to 16 m
PLMS AP800
Remove centre for 8 to 16 m
Retain centre for 4 to 8 m
TAG
SETS
USER
SETS
PC

18 Dräger Polytron Pulsar 2
Installing and commissioning the Dräger Polytron Pulsar 2
8.2 Alignment and zeroing
The Dräger Polytron Pulsar 2 must be aligned and zeroed
when it is first installed and whenever the Transmitter or
Receiver are moved. Before carrying out the electronic
alignment with the Dräger Hand Held Terminal, check whether
the Attenuator Plate needs to be fitted (see above) and that the
units point towards each other as accurately as possible by
eye. This will save time by reducing the number of steps
needed and ensure that you find the strong central peak. Be
aware that weaker, false peaks can occur when the
Transmitter and/or Receiver point away from the correct axis,
for instance when light from the Transmitter reflects off an
adjacent surface.
To access the Transmitter and Receiver gimbals, Remove the
cover screws and lift off the cover. Loosen the eight clamping
screws on the gimbals assembly, and then retighten them
gradually until the head unit will move smoothly in all directions
but remain in position.
8.2.1 Step 1. Initial Receiver alignment
Select in the 'Rx Align + Zero' menu to put the Receiver
into its Alignment Mode. Digital signals from the Receiver will
in turn command the Transmitter to flash in its Alignment Mode
(an irregular flash sequence) and cause the Dräger Hand Held
Terminal to show an Alignment screen. The live display shows
the received signal strength both numerically and as a bar-
graph. Above and to the right is a Cartesian 'target' showing
the orientation of the Receiver with respect to the straight line
to the Transmitter lens:
First move the Receiver around to be sure you have found the
strong central peak in signal. Now make slow adjustments in
the vertical and horizontal directions alternately, each time
correcting the direction with the greater error, until the display
looks like the diagram. Tighten the eight screws progressively
in rotation to avoid shifting the alignment.
8.2.2 Step 2. Transmitter alignment
4 to 60m Transmitter
Connect the Dräger Hand Held Terminal and check that the
signals from the Receiver are being displayed. If they were
absent it would indicate that the digital link from the Receiver
was not connected, usually due to a wiring fault. Also look into
the Transmitter lens to check it is flashing at the correct,
irregular rate of four per second. A regular twice per second
would indicate inadequate voltage at the supply or excessive
voltage drop in the supply cables.
At the left of the Alignment screen the Transmitter 'target'
shows its orientation with respect to the straight line to the
Receiver lens:
First move the Transmitter around to be sure you have found
the strong central peak in signal. Make slow adjustments as
before, correcting the horizontal or vertical direction with the
greater error, until the display looks like the diagram. Tighten
the eight screws progressively in rotation to avoid losing the
alignment. The Transmitter and connector covers can now be
replaced. Proceed to step 3.
30 to 120m and 100 to 200m Transmitters
Connect the Dräger Hand Held Terminal and check that the
signals from the Receiver are being displayed. If they were
absent it would indicate that the digital link from the Receiver
was not connected, usually due to a wiring fault. Also look into
the Transmitter lens to check it is flashing at the correct,
irregular rate of four per second. A regular twice per second
would indicate inadequate voltage at the supply or excessive
voltage drop in the supply cables.
NOTICE
The Dräger Polytron Pulsar 2 is supplied with default
configurations as listed in the Specifications section.
Any changes to these default settings are carried out
as part of the commissioning process.
i
i
ALIG
LENS
UP
Correctly
Aligned
LENS
DOWN
LENS RIGHTLENS LEFT
01423892.eps
NOTICE
The alignment screen on the Dräger Hand Held Termi-
nal will vary depending on whether you are aligning a
4-60m Transmitter or the longer range Transmitters
(30-120m and 100-200m). Please ensure you follow
the correct step for EITHER a 4-60m Transmitter or
30-120m and 100-200m Transmitters highlighted be-
low.
i
i
LENS
UP
Correctly
Aligned
LENS
DOWN
LENS RIGHTLENS LEFT
01523892.eps

Planned maintenance
Dräger Polytron Pulsar 2 19
At the left of the Alignment screen the Transmitter 'target'
indicates the degree of misalignment but not (unlike the
Receiver) its direction:
First move the Transmitter around to be sure you have found
the strong central peak in signal. Make slow adjustments, first
vertically then horizontally, to maximise the signal strength.
The final horizontal adjustment moves the circle from right to
left, until the display matches the diagram. Tighten the eight
screws progressively in rotation to avoid losing the alignment.
The Transmitter and connector covers can now be replaced.
8.2.3 Step 3. Final Receiver alignment
As you return to the Receiver use the portable detector to
check that the beam path is free of gas, in preparation for the
zeroing procedure that follows. At the Receiver, make any final
adjustment needed to centre the display. This is more likely to
be necessary if the initial alignment was poor, or if the
operating distance is short, causing movements of the
Transmitter to have a proportionately larger angular effect at
the Receiver. Replace the Receiver cover, ensuring all the
screws are tight. Leave the Dräger Hand Held Terminal
connected for Step 4.
8.2.4 Step 4. The Zeroing Procedure
The Zeroing Procedure must be carried out whenever the
Dräger Polytron Pulsar 2 is cleaned or realigned. It checks the
installation and stores measurements for the normal situation
that the path is free of gas and has good visibility. These form
the standards of comparison to detect dirt on the lenses and
gas in the path, so it is essential that the beam is unobstructed
by people or objects and there is no fog or gas in the air. For
preference choose a time when the weather is dry, the
temperature moderate, and the Dräger Polytron Pulsar 2 has
been powered for at least 30 minutes.
Select from the 'Rx Align + Zero' menu. There is a
countdown from 32 to show the progress of the zeroing and a
display of relevant measurements such as the Receiver's
(internal) temperature and supply voltage. The countdown
proceeds slowly at first, then more rapidly as the Transmitter
switches to Strong Mode. It should reach zero in about 40
seconds and then be replaced by a zero gas reading, showing
that the procedure is complete. If any of the checks on the
installation fail then the countdown will halt or re-start. They are
deliberately made more stringent, for instance in the accuracy
of alignment required, than the laxer standards that would
allow a working Dräger Polytron Pulsar 2 to remain so. You are
prompted to press a key to see an explanation of the problem.
The countdown visible at the Dräger Hand Held Terminal is
accompanied by a downward ramping of the analogue current
loop signal from 20mA. This allows personnel in the non-
hazardous area to follow the progress of the zeroing and to
check that the analogue circuit is not prevented from reaching
full scale.
8.2.5 Step 5. Verification with Test Sheets
The purpose of the Test Sheets is described in Understanding
The System. Hold a stack of five immediately in front of the
Receiver lens. Verify from the Dräger Hand Held Terminal
screen and from the control equipment that the complete
system responds correctly, as if to gas. If the reading is off
scale, remove sheets one by one until it is on scale. Record the
mean reading, together with the serial numbers of the
Transmitter, Receiver and Test Sheets for future reference.
Recording the Test Sheet readings enables you to check
subsequently that the response to gas has not been affected
in any way. You may also wish to introduce the Sheets one by
one to check correct operation of the control equipment at
intermediate readings. If required, similar checks can be
carried out with real gas using the Gas Check Kit GCK400.
Unlock the alarm activation at the control device to put the
system back to normal operating mode.
9 Planned maintenance
1 The Dräger Polytron Pulsar 2 has been designed so that it
will give long and reliable service with the minimum of
maintenance. The Dräger Polytron Pulsar 2 will warn the
operator if the Optics become contaminated or if it
becomes misaligned for any reason.
2 Depending on the application and the environment as well
as the work practices at the site planned maintenance
consists of-
zChecking the detectors response to Gas Check Cards.
Ensuring first that any control functions have been
inhibited.
zCleaning the optics as necessary. If the detector warns of
contaminated optics or if it is known that the detector may
have been contaminated by drilling mud, oil mist, dust etc.
The lenses are specially coated to assist in keeping them
clean, however if it becomes necessary to clean them care
must be taken so as not to remove the lens coating. A soft
cloth with clean fresh water or Dräger lens cleaning fluid
should be used. The detector should be realigned and
rezeroed as per the instructions following any work on the
detector.
CORRECTLY
ALIGNED
MISALIGNED
01623892.eps
ZERO

20 Dräger Polytron Pulsar 2
Specification
10 Specification
Housing Electro-polished ANSI type 316 marine grade stainless steel
Brackets Electro-polished ANSI type 316 marine grade stainless steel
Cover ABS moulded plastic
Lens Treated optical glass.
Integral Cable
(if fitted)
Armoured, flame retardant, halogen free, MUD resistant
Operating range 4 to 60m, 30 to 120m or 100 to 200m Transmitter to Receiver
Operational limit -40°Cto+60°C(-40°Cto+140°F),800 to 1100 hPa, 0 to 100% r.h.
Span Configurable between 0 - 4 LELm and 0 - 8 LELm.
Source Xenon flashlamps with built-in redundancy. First lamp failure causes Receiver to output warning, operation
continues with unchanged calibration.
Calibrations No field calibration required. Receiver holds factory-calibrations for up to four gases or gas mixtures, switch-
able by field configuration. The LEL/LFL values for calibrations are to IEC 61779 (factory-option of NIOSH
or EN 50054). Gases detected include the alkane series methane to hexane. Receiver version optimised
for ethylene (ethane) has separate part number. Warm-up time : 12 s. Beam Block period after power inter-
ruptions (≥10 ms) : 12s.
Response time With Rx Tx digital link: Normally ≤2.0 seconds to ≥90% following a step change in path-integral concentra-
tion. Increases to ≤10s to achieve maximum performance in reduced visibility due to fog etc.,
Without Rx Tx digital link: Normally ≤2.5 seconds to ≥90% following a step change in path-integral concen-
tration. (NOTE: Operation without link is not recommended for locations liable to reduced visibility due to
fog, snow, dust storms etc.)
Interference Immune to common contaminants and sun and flare radiation.
Alignment Built in sensor system with separate “radar” displays on Dräger Hand Held Terminal screen for Transmitter
and Receiver alignment. Zeroing not possible unless correctly aligned (≤± 0.15°). Tolerance ± 0.6° before
Beam Block.
Mounting Dual clamping gimbals assembly.
Firmware Upgradeable by portable PC connected to local Dräger Hand Held Terminal port or remote AI500 interface.
Outputs Self configuring current sink or source. Fully linearised 4-20 mA gas signal with Fault at 0 mA, Beam-block
at 2 mA, and a configurable Pre-warning for dirty or misaligned optics, broken Rx-Tx link, or first lamp failure
(0 to 5 mA, default 3.5 mA). LEL.m = ((I (in mA)-4 mA)/ 16 mA * (full scale)). Overrange at 20.5 mA. Output
is self-configuring for current-source and current-sink circuits. Interrogation/diagnostics of the detector, lo-
cally via the Dräger Hand Held Terminal device, or remotely via 4th-wire digital link to AI500.
Connections Transmitter: three wire (3rd wire optional for Rx-Tx digital link).
Receiver: four wire (4th wire optional for digital communications and Rx-Tx link).
Power Supply Voltage: 18 - 30VDC (24VDC nominal)
Power Consumption
Rx max: 5 W
Tx max: 13W
Current: ≤0.95 A typical @ 24 volts DC, , inrush current: 1.5A
Temperature -40 to 60 °C operating, with integral sun cover. Flare radiation ≤2kW/m2at ≥30° to optical axis continuously;
≤3kW/m2at ≥30° to optical axis for ≤20 minutes)
Storage Temperature: - 40 °C ...60 °C/ -40 °F ...140 °F
Humidity: 0...95% r.H.
Pressure: 700...1300 hPa.
Repeatability ± 0.1 LFLm
Linearity Error ±5% of Full Scale Defl ection
Optics Integral heater to eliminate snow/icing.
Data-logger Integral with non-volatile memory. Records events and max-min operating parameters with 2 hr resolution,
overwritten after 8 days. Consolidated weekly records for 32 weeks. Both records readable locally via Drä-
ger Hand Held Terminal or remotely via AI500 interface to Dräger Hand Held Terminal or portable PC.
Dimensions 338 x 258 x 216mm
Weight With eX link connector plug and socket
Transmitter 5.5kg
Receiver 5.5kg
With junction box and flying lead
Transmitter 7.0kg
Receiver 7.0kg