Dräger Polytron Pulsar 2 Open Path Gas Detector Technical Manual

Dräger Polytron Pulsar 2 Open Path Gas Detector Technical Manual
Dräger Polytron Pulsar 2
Open Path Gas Detector
Technical 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.
i
Content
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
Dräger Polytron Pulsar 2
3
For your safety
1
For your safety
2
Intended use
1.1
General safety statements
2.1
Dräger Polytron Pulsar 2 open path gas
detector
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 explosionhazard areas and which have been inspected and approved in
accordance with International or European explosionprotection regulations may be used only under the specified
conditions. The equipment or components may not be
modified in any manner.
!
1.2
WARNING
The Draeger Polytron Pulsar 2 has no userserviceable parts. Unauthorised opening can lead to a
safety related failure of the unit.
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:
DANGER
!
4
Indicates an imminently hazardous situation which, if
not avoided, will result in death or serious injury.
!
WARNING
!
CAUTION
ii
NOTICE
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 explosionprotection approvals are not valid for use in oxygen enriched
atmospheres. In case of unauthorised opening of the
enclosure, the explosion-protection approval is voided.
NOTICE
ii
The Dräger Polytron Pulsar 2 is one of the family of detectors certified under the designation GD8. All certificates will refer to the GD8
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)
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
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.
Indicates additional information on how to use the
product.
Dräger Polytron Pulsar 2
Parts supplied
3
1
2
3
4
Parts supplied
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.
An Optical Attenuator for use on beam paths between 4
and 16 metres, NOTE this is only supplied with 4-60m
Transmitters.
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.
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.
Dräger Polytron Pulsar 2
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 eyesafe 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:
1 Normal 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.
2 Strong Mode. Flashes of increased intensity are output at
a regular 4Hz rate.
3 Alignment 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.
5
Understanding the system
4
5
Low-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.
Fault 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 twoway 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
6
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 builtin 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) 1 or
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 interchangeable and refer to the volume ratio of flammable gas in air
below which an explosive atmosphere will not form.
Dräger Polytron Pulsar 2
Installation of a Dräger Polytron Pulsar 2
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
2
3
4
5
The distance between the Transmitter and Receiver should
agree with the model selected (i.e. 4-60m, 30-120m or 100200m). Note that the Optical Attenuator should be fitted
below 16 metres.
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 collect.
{ 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.
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.
Dräger Polytron Pulsar 2 is immune to sunlight so there is
no need to take account of the sun position when siting
detectors.
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.
Dräger Polytron Pulsar 2
7
Installation of a Dräger Polytron Pulsar 2
Figure 1: Wall mounting of Dräger Polytron Pulsar 2 with Ex e junction box
FRONT VIEW
Front cover fitted
SIDE VIEW
Front cover removed
71
216
Gimbal Clamps
Locking screws for
horizontal adjustment.
258
Rigid mounting surface. Flat to within ± 3.5mm over rear cover area
338
155
Rear cover
Locking screws for
vertical adjustment.
Mounting bolts M8 max.
Terminal Box cover bolts.
DO NOT OPEN WHEN ENERGISED
Terminal Box fixing bolts
Minimum bend diameter
= 6 x cable diameter
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
00223892.eps
Figure 2: Wall mounting of Dräger Polytron Pulsar 2 with eX link plug and socket
FRONT VIEW
Front cover fitted
71
Gimbal Clamps
SIDE VIEW
Front cover removed
Front cover
fixing screws
Locking screws for
horizontal adjustment.
Locking screws for
vertical adjustment.
258
216
338
155
Rigid mounting surface. Flat to within ± 3.5mm over rear cover area
Rear cover
Mounting bolts M8 max.
eX Link plug
eX Link socket/coupler
00323892.eps
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.
8
Dräger Polytron Pulsar 2
Electrical installation
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
600
585
571
558
550
546
535
525
517
509
502
500
496
492
488
484
485
462
450
472
483
483
Tx current consumption
Rx current consumption
451
441
409
400
420
430
399
388
378
357
350
336
367
346
300
18
19
20
21
22
23
24
25
26
27
28
29
30
Voltage DC
004223952.eps
Dräger Polytron Pulsar 2
9
Electrical installation
6.1
Dräger Polytron Pulsar 2 maximum
permissible power cable lengths
Cable run in metres: To Transmitter only
Worst case 20V
supply:
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
Cable run in metres: To both Transmitter AND Receiver
17 AWG:
118
157
197
236
275
315
354
Worst case 20V
supply:
16 AWG:
149
198
248
297
347
397
446
15 AWG:
188
250
313
375
438
500
563
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 Ω total
21V
22V
23V
24V
25V
26V...
30V
74
98
123
147
172
197
221
14 AWG:
236
315
394
473
552
631
709
1.5
mm2:
111
147
184
221
258
295
332
13 AWG:
298
398
497
596
696
795
895
2.5
mm2:
184
246
307
369
430
491
553
12 AWG:
376
501
627
752
877
1003 1128
885
11 AWG:
474
632
790
948
1106 1265 1423
10 AWG:
598
797
997
1196 1395 1595 1794
1 mm2:
4 mm2:
295
393
491
590
688
786
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
11 AWG:
308
410
513
615
718
820
10 AWG:
388
517
646
776
905
1034 1164
10
Cable run in metres: To Receiver only
Worst case 20V
supply:
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
732
2.5 mm2:
524
699
874
1049 1224 1399 1573
923
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
Dräger Polytron Pulsar 2
Electrical installation
Cable run in feet: To booth Transmitter AND Receiver
Cable run in feet: To Receiver only
Worst case 20V
supply:
21V
22V
23V
24V
25V
26V...
30V
Worst case 20V
supply:
21V
22V
1 mm2:
242
322
403
484
564
645
725
1 mm2:
688
918
1147 1377 1606 1835 2065
1.5 mm2:
363
484
605
725
846
967
1088
1.5 mm2:
1032 1377 1721 2065 2409 2753 3097
2.5 mm2:
605
806
1008 1209 1411 1612 1814
2.5 mm2:
1721 2294 2868 3441 4015 4589 5162
4 mm2:
967
1290 1612 1935 2257 2580 2902
4 mm2:
2753 3671 4589 5506 6424 7342 8259
18 AWG:
199
265
332
398
464
531
597
18 AWG:
567
755
944
17 AWG:
251
335
418
502
586
669
753
17 AWG:
714
952
1191 1429 1667 1905 2143
16 AWG:
317
422
528
633
739
844
950
16 AWG:
901
1201 1501 1802 2102 2402 2702
15 AWG:
399
532
665
798
931
1064 1197
15 AWG:
1136 1515 1893 2272 2651 3029 3408
14 AWG:
503
671
839
1007 1174 1342 1510
14 AWG:
1432 1910 2387 2865 3342 3820 4297
13 AWG:
635
846
1058 1269 1481 1692 1904
13 AWG:
1806 2408 3010 3613 4215 4817 5419
12 AWG:
800
1067 1334 1601 1867 2134 2401
12 AWG:
2278 3037 3796 4555 5315 6074 6833
11 AWG:
1009 1346 1682 2018 2355 2691 3027
11 AWG:
2872 3830 4787 5744 6702 7659 8616
10 AWG:
1273 1697 2121 2545 2969 3393 3818
10 AWG:
3622 4829 6036 7244 8451 9658 10865
Cable run in feet: To Transmitter only
Worst case 20V
supply:
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
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
Dräger Polytron Pulsar 2
23V
24V
25V
26V...
30V
1133 1322 1511 1700
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.
921
11
Electrical installation
Figure 4: Connection diagram powered via Transmitter
Transmitter
terminal box
connections
SE
7
5
6
1
4
1
2
6
6
5
5
4
4
21
21
cable
screen
3
3
cable
screen
7
7
Blanking
Plug
supplied
3
4
3
+24Vdc
0-20mA
Digital
Common
2
5
6
7
+24Vdc
0-20mA
Digital
Common
ES
ES
+24V dc
0-20mA
Digital
(see note 5)
Common
Link Cable
to Transmitter
Link Cable
to Receiver
SE
cable
screen
Receiver
terminal box
connections
To
Control
Equipment
Ex e gland
supplied fitted
To
Transmitter
head unit
To
Receiver
head unit
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.
6) does not comply with DNV requirements
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.
00523892.eps
Figure 5: Connection diagram powered via Receiver
Transmitter
terminal box
connections
Receiver
terminal box
connections
E
screen
E
S
5
2
1
3
4
5
4
2
3
7
6
7
6
6
1
7
7
5
5
4
4
3
3
2
2
1
1
To
Transmitter
head unit
S
S
+24Vdc
unused (see note 5)
Digital
Common
cable
screen
0-20mA
E
E
Blanking
Plug
supplied
+24V dc
6
S
cable
screen
+24Vdc
unused (see note 5)
Digital
Common
LINK CABLE
Ex e gland
supplied fitted
Digital (see note 5)
Common
To
Control
Equipment
To
Receiver
head unit
NOTES:
1) Glands to be Ex e type e.g. Hawke 501/453/UNIV/...
CAUTION
2) Entry points for Link Cable and Control Equipment may be
This diagram must be followed to ensure correct operation,
interchanged provided that the correct connections are maintained.
whether the installation is in a hazardous area or not.
3) The Transmitter and Receiver assemblies must be securely earthed.
For safe operation in a hazardous area you must also refer to
4) It is essential for correct operation that the Digital and Common lines of the Tx and Rx
the certification documents and comply with all local regulations.
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.
6) for DNV compliant installations connect the cable screen one sided to PE on the power supply
00623892.eps
12
Dräger Polytron Pulsar 2
Cabling the Ex d certified connector
Figure 6: Connection diagram powered individually
Transmitter
terminal box connections
Receiver
terminal box connections
See note 2
S
S
cable screen
E
E
cable screen
7
5
4
5
5
4
4
3
3
2
2
1
1
To
Transmitter
head unit
1
6
6
1
7
7
2
3
4
6
S
S
3
E
E
Blanking
Plug
supplied
2
5
6
7
Blanking
Plug
supplied
Ex e gland
supplied fitted
Instrument Earth
0-20mA
+24V dc
Digital
Common
+24V dc
Instrument
Earth
(See notes 4 and 5)
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.
6) does not comply with DNV requirements
To
Receiver
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.
00623892.eps
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.
ii
NOTICE
The Dräger Polytron Pulsar 2 Transmitter is a 3 wire
device and the Receiver a 4 wire device.
The following instructions give some information on how to
connect field wires to the socket; further information is
available at http://www.ceag.de.
Dräger Polytron Pulsar 2
13
Cabling the Ex d certified connector
Figure 7: Exploded view of the socket
1
11
10
9
6
7
8
4 3
5
2
12
00823892.eps
1
3
5
7
9
11
7.1
Socket sleeve
Thrust washer
Inner gland nut
Clamp cone
Inner thrust washer
Contact pins
2
4
6
8
10
12
Outer cap nut
Outer seal
Sleeve
Inner seal
Insulation sleeve
Socket insert
Ex d socket cable specification
7.2.1
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
NOTICE
Ithat the -ve core (common) MUST have the large contact pin fitted, the pins are colour coded so that the
large pin is easily distinguishable from the other 3 pins.
4. Carefully crimp the pins into position, ensuring that the hexagonal collar is not damaged during the process. A crimping tool is recommended and is available from Dräger or
your local distributor
14
2
1
3
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 ensuring 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)
ii
Figure 8
4
00923892.eps
1
2
3
4
z
Contact end (connects with plug)
Hexagonal collar
Crimp end (fit to cable)
Colour coded bar
Push 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).
NOTICE
ii
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.
Dräger Polytron Pulsar 2
Cabling the Ex d certified connector
Figure 9: Cable preparation and wiring
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)
8
Outer sheath
Steel/wire braid
30
Protective sleeve
35
50mm
01023892.eps
Rear of socket insert
2
Front of eXLink socket (insert fitted)
1
1
2
Key way
4
3
4
3
Location lug
01123892.eps
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.
Dräger Polytron Pulsar 2
15
Cabling the Ex d certified connector
Figure 10: Connection diagram powered individually using CEAG Ex d connector
Transmitter Connections
Rear of eXLink
socket
2
3
Receiver Connections
Rear of eXLink
socket
2
3
1
4
1
4
(See notes 2 and 3)
Instrument Earth
+24V dc
0-20mA
Common
Digital
Common
Digital
+24V dc
Instrument
Earth
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.
01223892.eps
16
Dräger Polytron Pulsar 2
Installing and commissioning the Dräger Polytron Pulsar 2
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 accessory)
{ Nominal 24V dc power.
{ Where junction boxes are used Three M20 Ex e certified cable glands if unit is to be powered via Transmitter
or via Receiver.
Two M20 cable glands if unit is to be linked in marshalling/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 immediately.
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.
NOTICE
ii
Only apply the power if you intend to fully commission
the detector at this stage.
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 distance 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 retaining ring.
z During 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.
z The 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.
Dräger Polytron Pulsar 2
Figure 11: AP800 Attenuator plate (fitted to 4-60 m
Transmitter only)
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
01323892.eps
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 TAG 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 SETS in 'Rx Main
Menu'. A new configuration file can be written from the Hand
Held Terminal with USER in 'Rx Memory Menu'. To see the
settings that are available to be sent, choose SETS in the 'Not
Connected' menu. To change them, connect the Hand Held to
a computer in the non-hazardous area, go to PC 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.
17
Installing and commissioning the Dräger Polytron Pulsar 2
ii
8.2
8.2.2
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.
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
ii
Step 2. Transmitter alignment
NOTICE
The alignment screen on the Dräger Hand Held Terminal 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 below.
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:
LENS
UP
Step 1. Initial Receiver alignment
Select ALIG 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 bargraph. 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:
LENS LEFT
LENS RIGHT
Correctly
Aligned
LENS
DOWN
01523892.eps
LENS
UP
LENS LEFT
LENS RIGHT
Correctly
Aligned
LENS
DOWN
01423892.eps
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.
18
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.
Dräger Polytron Pulsar 2
Planned maintenance
At the left of the Alignment screen the Transmitter 'target'
indicates the degree of misalignment but not (unlike the
Receiver) its direction:
check that the analogue circuit is not prevented from reaching
full scale.
8.2.5
MISALIGNED
CORRECTLY
ALIGNED
01623892.eps
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
8.2.4
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
1
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.
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 ZERO 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 nonhazardous area to follow the progress of the zeroing and to
Dräger Polytron Pulsar 2
Step 5. Verification with Test Sheets
2
z
z
Planned maintenance
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.
Depending on the application and the environment as well
as the work practices at the site planned maintenance
consists ofChecking the detectors response to Gas Check Cards.
Ensuring first that any control functions have been
inhibited.
Cleaning 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.
19
Specification
10
Specification
Housing
Brackets
Cover
Lens
Integral Cable
(if fitted)
Operating range
Operational limit
Span
Source
Electro-polished ANSI type 316 marine grade stainless steel
Electro-polished ANSI type 316 marine grade stainless steel
ABS moulded plastic
Treated optical glass.
Armoured, flame retardant, halogen free, MUD resistant
4 to 60m, 30 to 120m or 100 to 200m Transmitter to Receiver
-40 °C to +60 °C (-40 °C to +140 °F), 800 to 1100 hPa, 0 to 100% r.h.
Configurable between 0 - 4 LELm and 0 - 8 LELm.
Xenon flashlamps with built-in redundancy. First lamp failure causes Receiver to output warning, operation
continues with unchanged calibration.
No field calibration required. Receiver holds factory-calibrations for up to four gases or gas mixtures, switchCalibrations
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 interruptions (≥ 10 ms) : 12s.
With Rx Tx digital link: Normally ≤ 2.0 seconds to ≥90% following a step change in path-integral concentraResponse time
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 concentration. (NOTE: Operation without link is not recommended for locations liable to reduced visibility due to
fog, snow, dust storms etc.)
Immune to common contaminants and sun and flare radiation.
Interference
Built in sensor system with separate “radar” displays on Dräger Hand Held Terminal screen for Transmitter
Alignment
and Receiver alignment. Zeroing not possible unless correctly aligned (≤ ± 0.15°). Tolerance ± 0.6° before
Beam Block.
Dual clamping gimbals assembly.
Mounting
Upgradeable by portable PC connected to local Dräger Hand Held Terminal port or remote AI500 interface.
Firmware
Self
configuring current sink or source. Fully linearised 4-20 mA gas signal with Fault at 0 mA, Beam-block
Outputs
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, locally via the Dräger Hand Held Terminal device, or remotely via 4th-wire digital link to AI500.
Transmitter: three wire (3rd wire optional for Rx-Tx digital link).
Connections
Receiver: four wire (4th wire optional for digital communications and Rx-Tx link).
Voltage: 18 - 30VDC (24VDC nominal)
Power Supply
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/m2 at ≥30° to optical axis continuously;
Storage
Repeatability
Linearity Error
Optics
Data-logger
Dimensions
Weight
20
≤ 3kW/m2 at ≥ 30° to optical axis for ≤ 20 minutes)
Temperature: - 40 °C ...60 °C/ -40 °F ...140 °F
Humidity: 0...95% r.H.
Pressure: 700...1300 hPa.
± 0.1 LFLm
±5% of Full Scale Defl ection
Integral heater to eliminate snow/icing.
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 Dräger Hand Held Terminal or remotely via AI500 interface to Dräger Hand Held Terminal or portable PC.
338 x 258 x 216mm
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
Dräger Polytron Pulsar 2
Receiver default settings
11
1
Receiver default settings
Configuration
Range
Default setting standarrd receiver
Beam Block delay
10 - 255 seconds
60 seconds
Beam block to fault
0 - 255 minutes
60 minutes
Gas calibration (Standard Pulsar)
Table 1= Methane
Table 2 = Propane
Table 3 = Vacant
Table 4 = Vacant
Table 1 Methane
Gas calibration (Ethylene Pulsar)
Table 1 = Ethylene
Tables 2, 3, 4 = Vacant
Table 1 Ethylene
4-20mA span
4 - 8 LFLm for 20mA
8 LFLm
Auto Zero Tracking rate
0 - 12 LFLm per hour
0.05 LFLm per hour1
Dead-Band
0 - 0.5 LFLm
0.3 LFLm1
Static pre-warning current
0 - 5mA
3.5mA
Beam block time out to Fault
On/off
On
Static pre-warning
On/off
On
Auto Zero Tracking
On/off
On
Default values or lower comply with EN 60079-29-4:2009
Note: Default settings on older Pulsars. This should be taken into account when replacing older units in harsh environments.
Dräger Polytron Pulsar 2
21
Certification
12
Certification
Dräger Polytron Pulsar 2 Transmitter and Receiver
NOTICE
ii
IThe Dräger Polytron Pulsar 2 is one of the family of
Detectors certified under the designation GD8. All certificates will refer to the GD8.
International Certification
IECEx certificate number IECEx SIR 04.0006
Ex d[ia] IIC T5 (Tamb = -40 °C to +60 °C)
Ex d[ia] IIC T6 (Tamb = -40 °C to +40 °C)
European Certification
II 2GD
Ex d[ia] IIC T5 (Tamb -40 to +60 °C)
Ex d[ia] IIC T6 (Tamb -40 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)
Ingress Protection
(with weatherproof seal)
IP66/67
Electromagnetic Compatibility
EN50270
FCC Part 15 Class A
Terminal Box
Increased Safety Type
OTB-122
ATEX Certificate number Baseefa07ATEX0142X
td A21 T6 T85 °C
IECEx Certificate number IECEx BAS 07.0043X
Material-
Glass filled polyester, flame retardant to
IEC92.1, UL94V0
Ingress protection- IP66
Anti static<109 Ohm
Impact resistant>2 x 7 Nm
CEAG eXLink Connector
Manufacturer - Cooper Crouse-Hinds GmbH
ATEX Certificate number PTB 03 ATEX 1016X
II 2G Ex de IIC T6
22
Dräger Polytron Pulsar 2
Accessories list
13
Accessories list
Part number
Dräger Polytron Pulsar 2 Accessories
2350298
Junction Box Dräger Polytron Pulsar 2 ATEX
2350306
AI500 Digital Interface Unit for Dräger Polytron Pulsar 2
2350325
Dräger Polytron Pulsar 2 Alignment Kit, ATEX/CSA
2350326
Adapter AI500 to HHT or PC
2350327
Dräger Polytron Pulsar 2 PC Software with cable (supports Pulsar, AI500 and HHT)
2350238
Data Wand for AI500
2350339
Attenuator plate AP800
2350322
Dräger Polytron Pulsar 2 Remote Junction Box/HHT Kit
2350505
Dräger Polytron Pulsar 2 Alignment Telescope
2350510
ABS Moulded Cover
2350518
Gas Cell Kit single pass - Methane and Propane
2350521
Gas Test Sheets (set of 5, spares for p/n 2350325)
Part number
Dräger Polytron Pulsar 2 with ABS moulded cover and Ex e certified junction box
2350493
Dräger Polytron Pulsar 2 ATEX 4-60m (Complete TX + RX)
2350494
Dräger Polytron Pulsar 2 ATEX 30-120m (Complete TX + RX)
2350495
Dräger Polytron Pulsar 2 ATEX 100-200m (Complete TX + RX)
2350499
Dräger Polytron Pulsar 2 ATEX 4-60m (TX only)
2350500
Dräger Polytron Pulsar 2 ATEX 30-120m (TX only)
2350501
Dräger Polytron Pulsar 2 ATEX 100-200m (TX only)
2350502
Dräger Polytron Pulsar 2 ATEX 4-120m (RX only)
2350503
Dräger Polytron Pulsar 2 ATEX 100-200m (RX only)
2350340
Dräger Polytron Pulsar 2 ATEX 4-120m (RX only Ethylene)
2350341
Dräger Polytron Pulsar 2 ATEX 100-200m (RX only Ethylene)
Part number
Dräger Polytron Pulsar 2 with ABS moulded cover and Ex d certified plug and socket connectors
2350496
Dräger Polytron Pulsar 2 ATEX 4-60m (Complete TX + RX)
2350497
Dräger Polytron Pulsar 2 ATEX 30-120m (Complete TX + RX)
2350498
Dräger Polytron Pulsar 2 ATEX 100-200m (Complete TX + RX)
2350504
Dräger Polytron Pulsar 2 ATEX 4-60m (TX only)
2350506
Dräger Polytron Pulsar 2 ATEX 30-120m (TX only)
2350507
Dräger Polytron Pulsar 2 ATEX 100-200m (TX only)
2350508
Dräger Polytron Pulsar 2 ATEX 4-120m (RX only)
2350509
Dräger Polytron Pulsar 2 ATEX 100-200m (RX only)
2350342
Dräger Polytron Pulsar 2 ATEX 4-120m (RX only Ethylene)
2350343
Dräger Polytron Pulsar 2 ATEX 100-200m (RX only Ethylene)
Dräger Polytron Pulsar 2
23
Fault finding guide
14
ii
Fault finding guide
NOTICE
IThe Dräger Polytron Pulsar 2 generates a 4-20 mA
signal directly proportional to the measured gas concentration. For monitoring of potentially flammable gas
concentrations, the device should be connected to an
auxiliary system with latching alarms at adequately
chosen signal levels.
14.1 The Analogue Current Loop
In most installations the first indication of detector condition is
the analogue current loop reading. To interpret it fully you
need to know what digital configuration has been loaded into
the Receiver. Be sure to distinguish clearly between these
four conditions:
The 4-20mA measurement range
Readings in this range indicate gas on a linearised scale
between zero and a full scale quantity of a particular gas. That
span and the choice of gas are part of the Receiver
configuration. Typically the 20mA reading corresponds to 5 or
8 LEL.m of methane or of propane.
The Pre-warning level
This current is output to warn of conditions that could,
eventually, cause an inability to detect gas: misalignments of
the Transmitter or Receiver, dirty lenses, or mistriggering of a
flash tube. Note that the detector retains its full sensitivity and
that any gas reading above a low, configurable threshold
overrides the warning. Normally the level is 3.5mA and the
threshold is 0.3 LELm. However, some control equipment
cannot resolve currents below 4.0mA so 4.5mA, for instance,
may be chosen. There is no ambiguity provided the current
chosen corresponds to a gas reading below the threshold.
The Beam-block level
An output of 2mA shows that the detector is not able to detect
gas for reasons other than a hardware fault at the Receiver.
They include fog or a solid obstruction in the beam path, or that
the Receiver has become misaligned by two to three times the
amount that initiates the Pre warning. For compatibility with
other Dräger equipment the 2mA current is fixed, but two time
intervals associated with it are configurable. The first is the
time an obstruction must stay in the beam path to cause a
Beam-block, normally 60 seconds. The second is the time a
Beam-block must persist to generate a Fault, normally 60
minutes. In installations where beam interruptions are frequent
and tolerable it may be this delayed event which prompts
action rather than the Beam-block itself.
A sudden release of a large amount of pressurised and/or
refrigerated gas can result in a loss of visibility caused by
condensation of atmospheric water or the released gas itself.
As true for all optical open path systems, this may induce a
beam block on the Dräger Polytron Pulsar 2 which will impair
the Dräger Polytron Pulsar 2’s ability to detect the gas. The
beam block warning would be activated and reported to the
user. Although the scenario is rather unlikely, choosing shorter
rather than longer path lengths when installing Dräger
Polytron Pulsar 2’s in this application can further reduce
occurrence. In environments where fog generated by gas
leaks is a frequent problem, beam blocks should be taken as
indication for potential hazards and the use of additional point
detectors should be considered.
24
The Fault level
An output below 1mA indicates that the detector requires
attention, either because of a persisting Beam-block (see
above) or a hardware fault. There may be a fault either in the
Receiver itself or in the cables and terminations supplying it.
Note that a fault which prevents the Transmitter working at all
is not distinguishable from an obstruction in the path, so it will
generate Beam-block rather than Fault. Note too that the faulttolerant design of the Transmitter ensures that a partial
malfunction will not stop the detector working correctly.
However it does generate the Pre warning (see above) and
inhibit alignment and re-zeroing.
Be aware that spurious 'faults' may be caused if the
Dräger Polytron Pulsar 2 is used with control equipment from
other manufacturers without sufficient attention to detail.
Analogue loops are inherently prone to small drifts. Thus a
system programmed to recognise any current outside 4 to
20mA as Fault will do so if a zero gas reading drifts to 3.99mA.
Likewise, tolerance bands of say ±0.25mA should be allowed
for the Pre warning and Beam-block signals.
14.2 Fault finding
Once an abnormal condition has been identified from the
analogue loop signal, it is most easily investigated by looking
at the digital signals. The Dräger Hand Held Terminal (HHT)
can be connected at the Receiver both to view the data stream
and to interrogate the Receiver configuration. At the
Transmitter the data stream and the Transmitter's (less
extensive) configuration are available. If the AI500 Digital
Interface is installed then its Communicator port in the safe
area is directly equivalent to the HHT connection at the
Receiver. For more comprehensive diagnostic purposes the
AI500 also allows the long-term records from the
Dräger Polytron Pulsar 2’s internal data logger to be
downloaded into a portable computer via the infrared Data
Wand.
Besides measured values and flags, notice that the HHT
shows when new data is received with a block in the top right
corner of the Flags display. This useful indicator pulses every
few flashes normally, but only a few times a minute if the
Receiver is not registering light from the Transmitter.
Voltage and current are measured most conveniently at the
terminations of the field cables in the safe area. Be aware,
however, that voltage measurements here will not take
account of the volt drops in the field cables. Direct electrical
measurements at the Transmitter and Receiver terminals will
not normally be possible without a safety ('hot-work') permit.
Such measurements can be misleading, however, since the
current consumption varies continuously with the internal
heater and Transmitter charging cycles.
Dräger Polytron Pulsar 2
Fault finding guide
14.3 Problems relating to the Transmitter
Symptoms
Cause
Action
The detector outputs Beam-block. The
HHT receives data only a few times a
minute. The Transmitter is not flashing
The Transmitter is not powered
Check power supply and cabling
The Transmitter has an internal fault
Remove the Transmitter head and gimbal
assembly from its mounting, replace it with
a spare configured to the same Channel,
and return it to the factory. Changing the
Transmitter will not affect the calibration of
the detector, but it must be realigned and
re-zeroed in the normal way
The Transmitter and Receiver are config- Reconfigure the Transmitter and/or the
The detector outputs Beam-block. The
ured to different Channels
Receiver so that their Channels are the
HHT receives data only a few times a
same
minute. The Transmitter is flashing and
there is no obstruction in the path but the
Receiver is blind to the flashes
The detector output is at Pre warning.
The HHT indicates a Transmitter Fault
The Transmitter is in Fault Mode because
an internal test has indicated that one or
more of the flash tubes failed to trigger.
The test is made more stringent than normal operation by attempting to trigger the
tube at a reduced voltage. A complete cycle of tests is completed a few times per
hour if the flash rate is once per second
When the detector is switched to Align- The link is not connected between the
ment Mode the Transmitter flash rate fails Receiver and the Transmitter
to change to four per second, but remains
at once per second
It is not essential to replace the Transmitter
urgently, because the detector remains operational and its performance is not significantly impaired. The Pre warning may
clear of its own accord. If it persists then
the Transmitter should be replaced at the
next convenient opportunity. Remove the
Transmitter head and gimbal assembly
from its mounting, replace it with a spare
configured to the same Channel, and return it to the factory. Changing the Transmitter will not affect the calibration of the
detector, but it must be realigned and rezeroed in the normal way
Connect the HHT to the Transmitter. The
cause is confirmed if the HHT receives no
data. Check the cabling and connections
The Transmitter is in Fault Mode which Confirm that the HHT indicates Transmitter
prevents the detector being aligned and Fault. Further action as shown above for
zeroed. Fault Mode is designed to allow this Pre warning
the detector to continue working until it is
convenient to gain access to it. However
it is not recommended to reinstall a
Transmitter already in Fault Mode
When the detector is switched to Alignment Mode the Transmitter flash rate fails
to change to four per second, but instead
changes to two per second. The HHT
does not show any alignment data
An internal test in the Transmitter has de- Check the supply voltage at its source and
tected that the supply voltage is too low. that the cable run does not exceed the
The test is more stringent than an exter- maximum specified for the core size used
nal voltmeter test because it is made with
the heater switched on and at the peak of
the charging cycle
We have installed several detectors at
similar distances. One shows a lower signal strength than the others. Its alignment
readings also seem to wander
A difference of six on the HHT's signal
strength scale (in dB units) corresponds
to a halving of the signal strength. Variations of a few dB between units are normal. Larger variations could indicate that
a Transmitter or Receiver has been
aligned onto a false peak. For instance,
the Receiver may see the Transmitter
both directly and as a reflection in a shiny
surface close to the beam path
Realign and rezero the detector, taking
care to find the strong central peak. In
some circumstances a strong reflection
could cause false misalignment warnings
and need to be screened or covered
The mountings of the Transmitter and/or Provide additional bracing for the mountReceiver are not sufficiently rigid
ings. Notice that their rigidity is more important than their strength, changes in
direction more important than translational
movements
Dräger Polytron Pulsar 2
25
Fault finding guide
14.4 Problems relating to the Receiver
Symptoms
Cause
Action
The detector output is at Fault (<1mA).
The HHT receives no data
The Receiver is not powered
Check the power supply and cabling
The Receiver has an internal fault
Remove the Receiver head and gimbal assembly from its mounting, replace it with a
spare with the same configuration, and return it to the factory. Realign and re-zero
the detector in the normal way
The detector output is at full scale (20mA) The self-zeroing sequence has not been Align and zero the detector in the normal
completed
way
The detector fails to complete the self-ze- An internal check has detected abnorroing sequence. The HHT shows the Op- mally high signal strength. This is normaltics flag is set.
ly due to the Attenuator Plate not being
fitted
Measure the distance between the Transmitter and the Receiver. The Attenuator
Plate must be fitted if the distance is below
16 metres. The central cut-out must be removed if the distance is between 8 and 16
metres
The detector fails to complete the self-zeroing sequence. The HHT shows flags indicating Transmitter and/or Receiver
misalignment, even though no flags were
set in normal operation
The tests for correct alignment are made
more stringent during the self-zeroing
procedure. This is to give the detector the
best chance of working reliably, allowing
for small movements in the supporting
structure over a period of time
Check that both the Transmitter and Receiver are rigidly mounted. Carefully repeat the alignment procedure, ensuring
that both the Transmitter and Receiver are
aligned at the centre of the strong central
peak. Restart the self-zeroing procedure
The detector output is at Pre warning.
The HHT shows the Optics flag is set
The signal strength has remained for
some time significantly below the signal
recorded when the detector was last zeroed. The margin of signal loss, and the
interval for which it must be maintained,
to generate the warning are both part of
the Receiver configuration. Typical values are 40% loss for more than four days
Check the lenses of Transmitter and Receiver are clean. If necessary, clean, realign and rezero the detector. In some
locations fog may persist for longer than
the chosen interval, causing the warning to
be generated. It may then be ignored, or a
longer interval entered
The Receiver is seeing light from more
The detector behaves erratically. It
changes unpredictably from normal oper- than one Transmitter on the same Chanation with the HHT showing a strong sig- nel
nal to a Beam-block and little or no signal
although the path is not obstructed. The
HHT continues to receive data at the normal rate even when power is removed
from the Transmitter
Ensure that Receivers of all detectors within sight of each other are configured to
separate Channels, and that each Transmitter is configured to the same Channel
as its own Receiver
The detector output is at Beam-block.
The HHT shows the 'RxAlign' flag is set,
even though it was not set before the Beam-block occurred
The optical tests which detect misalign- Check for causes of partial obstruction
ment of the Receiver also serve to pre- such as a vehicle, a crane or a build-up of
vent its giving false gas readings due to a snow or ice intruding into the beam path
partial obstruction of the beam. If a partial
obstruction capable of causing a false
alarm persists for longer than the Beamblock delay it will cause a Beam-block
that is indicated like this
The Receiver has become sufficiently
misaligned to cause a Beam-block in a
time too short for the warning to be generated
We have installed several detectors with
similar configurations. One shows a lower response to the plastic test sheets than
the others
26
Investigate the cause of the movement.
The Receiver may have been struck or the
supporting structure may not be sufficiently
rigid
The inbuilt calibration is for the specified If required, the gas response can be tested
gas, not for solid plastic. The sheets are directly and in situ using the gas cells supintended to demonstrate that the detector plied in the GCK400 kit
is working correctly, not to simulate any
particular quantity of gas. It is normal for
individual units to show widely differing
responses to the sheets
Dräger Polytron Pulsar 2
The Dräger Hand Held Terminal
15
!
The Dräger Hand Held Terminal
15.3 Operation
WARNING
Switch the Hand Held Terminal on by pressing one of the four
keys. It can be left to switch off automatically, or be switched
off manually by pressing any two keys at the same time. It
connects to the Dräger Polytron Pulsar 2 Transmitter (Tx) or
Receiver (Rx) through their Intrinsically Safe ports. Unscrew
the knurled metal cover and screw in the metal connector of
the Hand Held Terminal's integral flying lead. Remember
always to replace the waterproof covers to prevent corrosion.
The separate mating connector (marked 'Comms Port')
mounted on the body of the Hand Held Terminal is for
connection to the PC and also provides a convenient sealed
receptacle for the flying lead when not in use.
As soon as the Hand Held Terminal is attached to an operating
unit (Tx, Rx or AI500) it initiates a two-way dialogue to
determine the connection. The screen displays the serial
number and tag string of the local unit, together with the
current measured data being output from the Receiver. In most
systems the data will be available at the Transmitter as well,
relayed via the digital link through which the Receiver also
controls the Transmitter's flash rate. The data will similarly be
available at the AI500, but only after you have chosen which of
the four input streams is to be displayed.
Pressing any of the keys switches the display to a series of
menus. Each menu offers four choices, corresponding to the
four keys. To keep the menu structure simple and intuitive, you
are presented with just those menus that are appropriate to the
connection that has been determined (Tx, Rx, AI500 or none).
Be aware, however, of two circumstances in which the
automatic connection process needs your intervention. The
first is when the Hand Held Terminal is moved rapidly from one
Dräger Polytron Pulsar 2 head to another. It detects a possible
new connection when there is a gap in the data stream
exceeding 30 seconds. If you move to a new unit quickly
enough to fool it then select the menu item NEW to identify the
new connection. Secondly, when the Receiver switches the
Transmitter into its Strong Mode (because gas has been
detected or the beam path is attenuated) the rapid stream of
data from the Receiver takes precedence over the dialogue
between the Transmitter and the Hand Held Terminal. Simply
place a hand in front of the lens for a few seconds to break the
stream and allow the dialogue to take place.
The menus are designed to be intuitive and self-explanatory.
Much the best way to familiarise yourself with them is by using
the Hand Held Terminal. The following summaries are
intended only to give you an overview of what to expect.
The Dräger Polytron Pulsar 2 has no user-serviceable
parts. Unauthorised opening can lead to a safety-related failure of the unit. Any unauthorised opening of the
unit invalidates all guarantee claims.
15.1 Description
The Dräger Hand Held Terminal is a robust and weatherproof
unit, certified for use in the hazardous area. It replaces the
MTL611B Communicator (based on a Psion Organiser) that
was formerly supplied. The Hand Held Terminal is used to align
and zero the Dräger Polytron Pulsar 2 Transmitter and
Receiver and to provide basic configuration and diagnostic
functions. Comprehensive configuration and diagnostics are
also provided in conjunction with a personal computer located
in the non-hazardous area. Thus a new configuration file can
be loaded into an internal memory from the PC, and then
copied into one or more Dräger Polytron Pulsar 2s located in
the hazardous area. Similarly, the unit can store the internal
data-logger records of up to three Dräger Polytron Pulsar 2s,
and then transfer the files to the PC for analysis or
transmission.
An adaptor cable (optional) also allows the Hand Held Terminal
to be connected to the AI500 Digital Interface, through a port
separate from the EIA RS 422/485 that may be hard-wired into
a system. It can be used to configure the tag identification
string and multi-drop node address of the AI500, and also to
link through the AI500 to any of the four Dräger
Polytron Pulsar 2 Receivers connected to it. In this way the
Terminal provides all the same functions that it would do if
connected directly to the remote Receiver in its possibly
inaccessible location.
15.2 Battery
The Intrinsic Safety certification requires that only the specified
battery type is used and that it be replaced in the nonhazardous area. To gain access to the battery compartment,
undo the four captive screws with a Philips screwdriver and
remove the transparent cover, noting that the cover is keyed
for the correct orientation. With a 2mm hexagon key loosen
(but do not remove) the four socket head screws that retain the
metal battery cover. Slide the cover outwards until it clears the
heads of the screws and remove it. Attach the battery
connector, slide the battery into the space provided, replace
the covers as they were and tighten the screws. Take care to
orient the transparent cover in the correct keyed position or the
waterproofing gasket will not be properly compressed.
Note that battery life is reduced at low temperatures. However,
the unit switches off automatically whenever no key is pressed
for five minutes, so the life is greatly extended in the normal
circumstance that the Hand Held Terminal is used
intermittently. To conserve the battery it should be removed
when the unit is not in use or could be switched on accidentally,
for instance in transit.
Dräger Polytron Pulsar 2
27
The Dräger Hand Held Terminal
15.4 MENUS WHEN CONNECTED TO Dräger
Polytron Pulsar 2 TRANSMITTER
TX MAIN MENU
1 View current readings READ
2 Enter Tx tag (and channel to match Rx) TAG
3 Connect to new Tx or Rx NEW
4 Alignment Mode (if no link to Rx) ON
The ON option is blanked if data from the Receiver shows that
the normal link is provided. Otherwise it toggles to OFF as
appropriate. The TAG option leads first to a menu to select the
starting point for editing the tag string: the string currently in
place, all characters blank, or the string saved to memory
when a tag was last sent. Often a Transmitter and Receiver are
given similar tags, and those of different Dräger
Polytron Pulsar 2s within the same installation follow a
numerical or alphabetic sequence. The next screen
provides + and - keys to change the channel within its
permitted range and the 11 characters of the tag string within
the character set:
0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]./
NOTICE
ii
that the permitted range of channels is 0..7 for Transmitters labelled '4 to 60m' and 8..11 otherwise. The use
of the NEW is explained above.
15.5 MENUS WHEN CONNECTED TO Dräger
Polytron Pulsar 2 RECEIVER
RX MAIN MENU
1 View current readings READ
2 View current settings SETS
3 Connect to new Tx or Rx NEW
4 More… more
The SETS option
lists
the
Receiver's
user-selected
parameters, such as the measurement span and static
warning current for the 4 20mA current loop output. The use of
the NEW option is explained above. If your connection to the
Receiver is through the AI500 Digital Interface (see below) this
option becomes LINK to break the existing link and connect to
another Receiver if you wish.
RX ALIGN + ZERO
1 Alignment Mode ALIG
2 Start Rx's self-zeroing ZERO
3 Stop zeroing or alignment STOP
4 More… more
The use of the ALIG and ZERO is explained in “Installing and
Commissioning the Dräger Polytron Pulsar 2” section of the
manual.
RX MEMORY MENU
1 Enter Rx tag (and channel to match Tx) TAG
2 Read Logger data from Rx into memory LOG
3 Send User-Settings in memory to Rx USER
4 More… more
The TAG option works as above. LOG allows the choice of
File1, File2 or File3 to hold the logger record (which includes
the Receiver's configuration), listing the serial numbers and
tag strings of the Receivers whose data is currently held.
RX 4 TO 20mA TEST
1 Current + +
2 Current - -
28
3 Stop test STOP
4 More… more
You can test control equipment connected to the Dräger
Polytron Pulsar 2 Receiver by imposing a current on its 4 to
20mA current loop output. + and - allow the test current
to be stepped up and down from 0.0 to 20.0mA in 0.5mA
increments, starting from 4.0mA. Return the Receiver to its
normal output mode with STOP without exiting this menu, or
with more to cycle back to 'Rx Main Menu'.
15.6 MENUS WHEN CONNECTED TO AI500
DIGITAL INTERFACE
AI500 MAIN MENU
1 Read tag and node address for RS485 READ
2 Enter new tag and node TAG
3 Connect to new AI500 NEW
4 Link via this AI500 to Rx A, B, C, or D LINK
TAG is as before, except that the permitted range of node
addresses is 0..32. All AI500 units respond to requests to Node
0, so that address must not be used in a multidrop.
The LINK option leads to a menu choosing between the four
Receivers connected to the 'A', 'B', 'C', and 'D' terminals of the
AI500 Digital Interface. Provided the selected Receiver is in
fact connected, the Terminal will connect to it and show its
serial number and tag string to confirm that the link has been
successfully established. Remember to break the link (see
above) when you are finished.
15.7 MENU WHEN TERMINAL IS NOT
CONNECTED
NOT CONNECTED
1 Connect to PC PC
2 View user-settings in memory SETS
3 View note for new users NOTE
4 Connect to Tx, Rx or AI500 TR/A
The PC option lists the serial numbers and tag strings of the
Dräger Polytron Pulsar 2 Receivers whose data logger
records are available for transfer as File1, File2 and File3 when
the appropriate Dräger software is run on the computer.
The SETS key lists the user-selectable parameters held in
memory (such as the measurement span and static warning
current for the 4 20mA current loop output) that can be
transferred from the computer and used to reconfigure
Receivers in the hazardous area. Note that, by
contrast, SETS in the Receiver menu lists the configuration
settings currently in place.
15.8 Maintenance
The Dräger Hand Held Terminal requires little routine
maintenance. Periodically check the housing and cable for
damage that may allow water ingress. If necessary the
enclosure may be cleaned using a damp cloth. In the event of
damage or suspected failure the unit should be returned to
Dräger.
There is a screwdriver adjustment for LCD contrast, accessible
through a hole at the bottom right of the screen. Do not change
the original factory setting unless you are sure it is no longer
correct. In particular, avoid making changes to compensate for
a weak battery or extremes of temperature, because the
setting will then be wrong in normal circumstances.
WARNING
!
Never open the housing in a hazardous area.
Dräger Polytron Pulsar 2
The Dräger Hand Held Terminal
15.9 Specification
Dimensions:
Weight:
Lead length:
Temperature:
classification
Temperature:
classification
Weather seal:
Screen type:
Graphics:
Text:
Battery:
Battery life:
MaterialsEnclosure:
Flying Lead:
Cable gland:
Connectors:
Switches:
133 x 145 x 75mm
800g
1 metre
-20 °C to 45 °C (operating) for T4 temperature
-20 °C to 60 °C (operating) for T3 temperature
IP66/67
Reflective LCD
128 x 128 pixels
16 lines of 21 characters
Duracell or Procell MN1604 Sealed Alkaline 9V
10 hours continuous use at 21 oC
!
WARNING
No attempt should be made to dissemble the unit in a
hazardous area.
The Dräger Hand Held Terminal contains no internal user
serviceable parts.
Unauthorised repair or modification may invalidate the
hazardous area certification.
In event of suspected failure the unit should be returned to
Dräger or your local distributor.
Polycarbonate
Outer sheath, PVC
Polyamide
Nickel-plated brass
PBT
15.10 Electromagnetic Compatibility
EN 50081-1
EN 50081-2
EN 61000-6-2
FCC Class A
15.11 Safety information
These instructions are intended to inform you of all aspects of
the Dräger Hand Held Terminal. It is vital for your safety and
that of others that its functions are understood and that every
aspect of installation, commissioning and maintenance are
carried out correctly. If you are in any doubt about any part of
these instructions, any function of the equipment, or any
operating procedure, please contact Dräger or your local
distributor.
The Dräger Hand Held Terminal is intended for use in
hazardous areas in conjunction with the Dräger
Polytron Pulsar 2. In non-hazardous areas it may be
connected to the Dräger AI500 Digital Interface or a personal
computer. For connection details refer to “The Dräger
Polytron Pulsar 2 Digital Interface AI500” section of the
Dräger Polytron Pulsar 2 installation manual.
The Hand Held Terminal is certified and intended for use in
hazardous areas that may contain potentially explosive
atmospheres. Install and use the Dräger Hand Held Terminal
in accordance with the latest local or national regulations.
In Europe the applicable standards include:
EN 60079 ELECTRICAL APPARATUS FOR EXPLOSIVE
GAS ATMOSPHERES
Part 10. Classification of hazardous areas
Part 14. Electrical installations in hazardous areas (other than
mines)
Part 17. Inspection and maintenance of electrical installations
in hazardous areas (other than mines)
To ensure electrical safety the Dräger Hand Held Terminal
should only be used within the parameters described in its
certification and must not be used in oxygen enriched
atmospheres.
Ensure the construction materials used for the external
components of the Dräger Hand Held Terminal are chemically
compatible with the intended process application.
Use only approved batteries. Do not change the battery in a
hazardous area.
Dräger Polytron Pulsar 2
29
The Dräger Hand Held Terminal
Figure 12: Dräger Hand Held Terminal
Draeger PLMS Ltd.
Plymouth, UK
BATTERY INSIDE
Approved Battery:
Duracell or Procell
MN 1604.
WARNING!
DO NOT CHANGE
BATTERY IN A
HAZARDOUS
AREA
01823892.eps
30
Dräger Polytron Pulsar 2
The Dräger Polytron Pulsar 2 Digital Interface AI500
16
The Dräger Polytron Pulsar 2
Digital Interface AI500
16.1 Description
The AI500 is a compact DIN/EN rail-mounted unit, normally
located in the non-hazardous area. It communicates digitally
with one to four Dräger Polytron Pulsar 2s and provides easy
access to their current measured values, their configurations,
and their internal data-logger records. The measurements
include not only gas reading and signal strength, but such
detailed information as supply voltage, temperature, noise
level and the x y alignments of Transmitter and Receiver. Data
is available through a hard-wired EIA RS 422/485
communications port, a separate port for the Hand Held
Terminal (or Communicator), and as an infra-red signal to a
Data Wand.
This multiplicity of functions allows the AI500 to be used in
systems with different levels of complexity. In a fullyengineered installation the full current and historical data are
available continuously to a central system via an EIA RS 485
multidrop. In the simplest, only the 4 20mA signal from each
Dräger Polytron Pulsar 2 is used for indication and control
action, with states requiring operator attention signalled as
static values of the current. When a Dräger Polytron Pulsar 2
is identified as requiring investigation, the operator uses the
non-contacting Data Wand to download the diagnostic
information into a notebook PC. The file can then be examined
locally or e mailed.
In all cases, the Hand Held Terminal (or Communicator) is able
to call up any one of the Dräger Polytron Pulsar 2 Receivers
connected to the AI500 and has the same functionality as if
connected to the field unit at its possibly inaccessible location.
16.5 Electromagnetic compatibility
EN 50081-1
EN 50081-2
EN 50082-1
EN 50082-2
EN 61000-6-2
FCC Class A
16.6 Infra-red output
Serial binary data is output via the Data Wand DW100 to an
IBM-PC compatible portable computer running Dräger
proprietary software. The infra-red coupling requires the tip of
the Wand to be brought within 30mm of the emitters adjacent
to Connector 1. Current measurements are output every 1.5
sec maximum, complete historical data for four Dräger
Polytron Pulsar 2s takes 12 sec. The infra-red output is
automatically inhibited when the unit is addressed via the EIARS-422/485 bus.
16.7 Connector 1: Power AND Dräger
Polytron Pulsar 2 Digital I/O
Terminal:
Function:
1
Common
2
Digital I/O Dräger Polytron Pulsar 2 Receiver A
3
Common
4
Digital I/O Dräger Polytron Pulsar 2 Receiver B
5
Common
6
Digital I/O Dräger Polytron Pulsar 2 Receiver C
16.2 Environmental
7
Common
The AI500 must be used only in a safe (non-hazardous) area
or within a suitably certified enclosure within the hazardous
area. The atmosphere should be non-condensing and free of
contaminants or pollutants harmful to electronic equipment.
The working temperature range is 0 °C to +55 °C for individual
units with free air circulation, and 0 °C to +45 °C for multiple
units in contact on the mounting rail.
NOTE: where temperatures exceed 45 °C, multiple units
stacked on a mounting rail horizontally or vertically should be
spaced a minimum of 15mm apart to allow air circulation
8
Digital I/O Dräger Polytron Pulsar 2 Receiver D
9
Common (Power supply 0V)
10
Common (Power supply 0V)
16.3 Power Supply
Power Supply: 24V DC nominal
Supply Range:20 to 32V
Consumption: 3W maximum
Internal Fuse: 250mA
16.4 Mechanical
Mounting:
35mm symmetrical rail (to EN50 022)
32mm asymmetrical rail (to EN50 035)
15mm symmetrical rail (to EN50 045)
Dimensions:
Above rail 80mm (with Connector 1: +10mm)
Across rail 80mm (with Connector 2 and 3: +20mm)
Along rail 25mm
Weight:120g
Dräger Polytron Pulsar 2
11
Power supply +24V
12
Power supply +24V
Removable polarised connector.
Phoenix Contact MST BT2.5/12-ST-5.08, 2.5mm2 (14AWG)
Terminals 1,3,5,7,9,10 and 11, 12 are linked internally.
The Digital I/O ports A, B, C and D communicate bi
directionally with up to four Dräger Polytron Pulsar 2
Receivers. They are compatible with all variants of the Dräger
Polytron Pulsar 2 but not with GD series detectors.
Digital current loop:
Logic 1 (Mark):
0mA
Logic 0 (Space):
5mA
Data rate:
1200 bits / s
Protocol:
Proprietary
Data integrity:
CRC-16 checksum
31
The Dräger Polytron Pulsar 2 Digital Interface AI500
16.8 Connector 2: EIA-RS-422/485 Serial Port
Terminal:
EIA-RS-422/485 Function:
13
0V (ref)
14
+5V dc out (100mA max)
15
TXB (+)
16
TXA (-)
17
RXB´ (+)
18
RXA´(-)
Removable polarised connector
Phoenix Contact MC 1.5/06-ST-3.81, 1.5mm2 (16AWG)
For two-wire operation Terminals 15, 17 and 16, 18 can be
linked internally with jumpers, accessed by removing the front
cover. The driver capability allows up to 32 AI500 units to be
addressed in a in a four-wire multidrop system, giving access
to a theoretical maximum of 128 Dräger Polytron Pulsar 2s. In
practice, the number of units will normally be determined by
considerations of polling rate. The node address of each unit
in the range 1..32 is held in non-volatile memory and can be
configured using the Dräger Hand Held Terminal (or
Communicator). All units respond to the node address 0.
Similarly, each unit can be assigned an 11-character tag string
to identify it independently of its node address. This, together
with the ability to assign tag strings to individual Dräger
Polytron Pulsar 2s, allows quick and certain checking of the
complete system at commissioning time.
The markings A, B, A´, B´ are as defined in ISO/IEC 8482. The
markings (+) and (-) show the polarity for Binary 1, stop-bit and
idle state. The host (master) system must provide idle-state
biasing with this polarity. The +5V dc supply is provided for that
purpose, or to power an RS485-to-RC232C converter, such as
the Amplicon 485F9i. The port, including the 5V supply, is
electrically isolated from the 24V supply and the Dräger
Polytron Pulsar 2 wiring.
16.10 Communicating with the AI500 Digital
Interface
For most purposes the AI500 can be used with equipment and
software supplied by Dräger, relieving the user of the need to
know the details of its digital communications. Information can
be provided for writers of software for a remote processor,
acting as Master of a multidrop system, to address one or more
AI500 units as Slaves. For this purpose the AI500 acts as a
dual-port memory which is automatically filled with the most
up-to-date values for a wide range of measured parameters
from the connected Dräger Polytron Pulsar 2s (gas reading,
signal and noise levels, x y alignments of Transmitter and
Receiver, supply voltage, temperature etc), their internal
configurations (gas calibration, serial number, tag designation
etc), and their internal data logger records. The data is
available for immediate access at data rates of 1200 or 9600
baud.
16.11 Summary of Dräger Protocol
All data is binary in frames of fixed length. Bytes are 8-bit, nonparity, sent least significant bit first with one stop bit. A Short
Format frame of five bytes is used for simple commands and
acknowledgements. A Long Format frame of 24 bytes or an
Extra-long Format frame of 263 bytes is used to transfer data
and configurations. Configurations are 16 byte blocks,
including an internal CRC 16 checksum in addition to the CRC
16 checksum used to transmit them. If synchronisation
between Master and Slave is lost then any garbled or
incomplete frame is discarded after a checksum error, a stop
bit error, or the absence of an expected start-bit after two byte
durations.
16.9 Connector 3: Hand Held Terminal Port
Terminal:
Optical Isolator Function:
19
Emitter (volt-free output -)
20
Collector (volt-free output +)
21
Anode (volt-free input +)
22
Cathode (volt-free input -)
Removable polarised connector
Phoenix Contact MC 1.5/06-ST-3.81, 1.5mm2 (16AWG)
The adaptor cable Dräger 2350326 allows connection of the
Dräger Hand Held Terminal (or Communicator). The port
complies with the requirements of its Intrinsic Safety
certification.
32
Dräger Polytron Pulsar 2
The Dräger Polytron Pulsar 2 Digital Interface AI500
Figure 13: Connection from the field device to the AI500
HAZARDOUS AREA
NON-HAZARDOUS AREA
Receiver
Transmitter
(see note 1)
Detector D
+24V dc
Common
(Instrument Earth)
Detector C
0V (ref)
(see note 4)
Instrument
Earth
5) RS422/485 Port (Terminals 13 to 18)
Markings A, B, A', B' as ISO/IEC 8482:1993.
Markings (+) and (-) show polarity for binary 1, stop-bit and
idle-states. The host (master) system must provide
idle-state biasing with this polarity.
6) Remove front cover for access to links.
7) Interface clips onto standard 15, 32 and 35mm
mounting rails.
Handheld Terminal
with Adaptor Cable
2
3
4
5
6
7
8
9
10
COMMON
A
B
COMMON
C
COMMON
D
COMMON
COMMON
PULSAR DIGITAL I/O
19
20
21
Draeger PLMS Ltd.
Plymouth UK
DIGITAL
INTERFACE
TYPE AI500
RS422/485 - 2W | 4W
(see note 6)
RS-422/485 Master
(see note 5)
11 12
+
+
18-32V dc
RS-422/485
connection to
4-wire system
0V (ref)
RXB' (+)
RXA' (-)
TXB (+)
TXA (-)
1
COMMON
3) For alternative Pulsar wiring options refer
to manual.
4) Loading of +5V dc output must not exceed 100mA.
(see note 2)
IR
OUT
HANDHELD
NOTES:
1) One to four Pulsar detectors may be connected to each
Digital Interface.
2) Up to 32 Digital Interfaces may be interconnected.
TXA/RXA' (-)
Detector A
+24V dc
0-20mA
Digital
Common
TXB/RXB'(+)
Link cable (4-wire)
Detector A
(see note 3)
RS-485
Master
(see note 5)
RS-485
connection to
2-wire system
Detector B
RS-422 / 485
PORT
13 0V (ref)
14 +5V out
(see note 4)
15 TXB (+)
16 TXA (-)
22
17
This device complies with part 15 of the FCC Rules.
Operation is subject to the following two conditions:
18 RX A'(-)
1) This device may not cause harmful interference, and
2) This device must accept any interference received,
including interference that may cause undesired operation.
RXB' (+)
(see note 2)
(see note 7)
01923892.eps
Dräger Polytron Pulsar 2
33
Using the Dräger Polytron Pulsar 2 with HART
17
Using the Dräger Polytron Pulsar 2 with HART
17.1 Description
The HART enhanced Dräger Polytron Pulsar 2 allows basic digital communications between the Receiver in the field and the safe
area without the need for extra cable cores. The digital signals are overlaid on the 0 20mA analogue current as a symmetrical
modulation, ensuring that the integrity of the normal reading remains unaffected. The Dräger Polytron Pulsar 2 is fully compatible
with Version 5 standards for a slave device published by the Hart Communication Foundation (HCF). Thus Dräger
Polytron Pulsar 2 inputs to a multiplexer can be mixed with those from any other HART-compatible device, including Dräger point
detectors:
Figure 14: a typical HART installation
PC running Emerson
AMS software
Pulsar Receivers or
other HART devices
1 to 32 (max 256)
1
32
0 -20mA analogue
current loops with
HART digital
signals
HART multiplex er
MTL4 841 + 2 x MTL 4842 (max 16)
RS232 / RS485
converter
1
RS 485 multidrop
(max 31 x
MTL4 841)
32
Normal 0 - 20mA
outputs to
control
equ ipment
02023892.eps
Normally the multiplexer is interfaced to a central computer
running the Asset Management System (AMS) from Emerson
Process Management. Although rudimentary operation is
possible using default settings (for instance using a HART
handheld communicator), it is important to use the AMS Pulsar
Installation Kit that implements the Dräger Polytron Pulsar 2specific Device Description (DD) and Windows Resource File
(WRF) to customise AMS. The screen displays it provides for
the operator are shown in Figures 15 to 24, which include the
context-specific help texts available by pressing the F1 key.
Users not wishing to use AMS but to write custom software
addressing Dräger Polytron Pulsar 2 directly through its HART
interface should refer to the HART Commands table (available
on request) which lists the Universal, Common-Practice, and
Device-Specific commands that are implemented.
It is important to note that a HART Hand Held Communicator
does not replace the Dräger Polytron Pulsar 2 Hand Held
Terminal, since it lacks the real-time graphics display required
for alignment and zeroing. Certain configuration settings,
which normally remain at their factory-default values, also
require the Dräger Polytron Pulsar 2 Hand Held Terminal to
install PC-generated configuration files. The Terminal is
likewise required to download data-logger records from the
Receiver. In general the strength of the HART protocol lies in
34
its convenience for basic maintenance tasks. As such it offers
relatively slow, low integrity communications. Consequently,
the number of devices of all kinds that can be addressed in a
HART system is normally limited by the response times to
operator requests and, most importantly, HART data should
never be used for safety-critical purposes. For installation
instructions, refer to the documentation supplied by the
manufacturer of the multiplexer to be used, and by Emerson
for the AMS system. Although Dräger Polytron Pulsar 2 is not
intended to be used in a HART multidrop configuration (not to
be confused with the RS485 multidrop shown above) for
normal operation, it is possible for up to ten Dräger
Polytron Pulsar 2 Receivers to be so connected in the
absence of their Transmitters. For instance, Receivers could
be powered up sequentially on a workshop bench to configure
their individual tags before they are installed. The HART tag
corresponds to the first eight characters of the longer Dräger
Polytron Pulsar 2 Receiver Tag, so the Dräger Polytron Pulsar 2
Hand Held Terminal provides an alternative way to set and check
the tags that will be used for HART addressing.
Dräger Polytron Pulsar 2
AMS operator screens and help texts
18
AMS operator screens and help texts
Figure 15 Process variables of AMS Tag
1
2
13
3
12
4
11
5
6
7
10
9
8
02123892.eps
1
Measurement of concentration times path length, giving an 2
indication of the risk potential due to flammable gases and
vapours. LFL (lower flammable limit) means the same as
LEL (lower explosive limit). As an example, a concentration
of 50% LFL filling 3 metres of the beam path reads 1.5
LFLm.
Tag- Text that is associated with the Field Device
installation. This text can be used in any way. A
recommended use is as a unique label to a plant that
correlates to a Field Device label: a plant drawing, or on a
Control System. It can also be used as a data link layer
address handle. Be aware that the HART tag is just the first
8 characters of the 11 character tag that can be read and set
by the Dräger Polytron Pulsar 2 Hand Held Terminal.
3
The unique serial number shown on the exterior label of the 4
Dräger Polytron Pulsar 2 Receiver, where it is prefixed by
70... (The transmitter will have an unrelated serial number
because Dräger Polytron Pulsar 2 Transmitters of the same
type can be interchanged at will.)
Descriptor- Text that is associated with the Field Device.
This text can be used by the user in any way. There is no
specific recommended
5
Dräger Polytron Pulsar 2 is not intended to be used in a
6
HART multidrop for normal operation. However, several
Pulsar Recievers can be so connected for bench testing in
the absence of a Transmitter. Each Receiver will then be in
Beam-Block and contribute 2mA to the total signal current.
Message- Text that is associated with the Field Device. This 8
text can be used by the user in any way. There is no
recommended use.
Date- Gregorian calendar date that is stored in the Field
Device. This date can be used by the user in any way. There
is no specific recommended use.
7
Dräger Polytron Pulsar 2
Open Path: The gas reading expressed as a percentage of
the 4-20mA range (to a maximum of 254%). Duct-mounted:
the gas reading expressed as a percentage of the 4-20mA
range (to a maximum of 254%). For the particular case of a
Duct-mounted Dräger Polytron Pulsar configured to read 0100% LFL for 4-20mA, this number can be read directly as
%LFL
35
AMS operator screens and help texts
9
Upper Range Value - The gas reading which produces an 10 Analog Output Value- Value that tracks the Digital Value
representation, under normal operating modes.
Analogue Output of 20mA and a Percent Range of 100%. It
is not recommended to set the URV below 4.0 LFLm unless
the operating environment is clean and dry, the ambient
temperature is relatively stable and the measurement beam
will not be obstructed.
11 The Supply voltage measured by the Receiver is the applied 12 Signal strength depends on the operating distance and the
voltage less the voltage drop in the cable.
presence of fog. Misalignment of the Transmitter and the
Receiver and dirt on their lenses can also affect this value.
13 The internal temperature of the Dräger Polytron Pulsar 2
Receiver. Normally a few degrees above ambient
temperature due to internal power consumption and the lens
heater.
36
Dräger Polytron Pulsar 2
AMS operator screens and help texts
Figure 16 Status of AMS Tag (Dräger Polytron Pulsar 2 Status)
1
9
8
7
6
5
4
3
2
02223892.eps
1
Please state this error code if you need assistance from the 2
service support centre.
The 4-20mA Analog Output is at Fault level (<1mA) because
of a Hardware Fault or because Beam-Block has timed out
to Fault. Please see Diagnostics Tab.
3
The 4-20mA Analog Output is at Beam-block level (2mA).
The Dräger Polytron Pulsar 2 is unable to detect gas for
some reason. Please see Diagnostics Tab.
4
The supply voltage at the Receiver end of its cable is out of
limits. This is not yet affecting the operation.
5
The internal temperature of the Receiver is unusually high or 6
low. This is not yet affecting the operation.
Transmitter reports some Xenon tube mistriggering OR the
digital link between the Receiver and the Transmitter has
broken. The Dräger Polytron Pulsar 2 remains operational
but should be serviced if this indication persists. The
sensitivity to gas is not affected.
7
The Transmitter is not pointing exactly towards the Receiver. 8
This is not yet affecting the operation.
Receiver Misalignment Pre-Warning”, The misalignment of
the Receiver towards the Transmitter exceeds 50% of the
allowed range OR the Receiver lens is partially obstructed.
This is not yet affecting the operation.
9
Warning of Attenuator plate absent from Transmitter OR
pre-warning of dirty lens. Please see Diagnostics Tab.
Dräger Polytron Pulsar 2
37
AMS operator screens and help texts
Figure 17 Status of AMS Tag (Diagnostics)
1
2
3
4
5
6
02323892.eps
1
The Analog Output is at Beam-block level (2mA). However, 2
the cause has been removed and the Dräger
Polytron Pulsar 2 is expected to restart operation in a few
seconds.
Gas reading shows a negative value. Before re-zeroing
please check for obstructions in the beam, misalignment or
lens contamination.
3
The signal-to-noise ratio is too poor for measurement. This 4
could be due to dense fog or an obstruction in the beam
path.
The Receiver is unable to 'see' the Transmitter. Possible
causes: (1) Obstruction in beam path (2) Receiver and
Transmitter not set to the same channel (3) A nearby
Dräger Polytron Pulsar 2 set to the same channel (4)
Transmitter not powered (5) Transmitter and/or Receiver
grossly misaligned.
5
The Optics Warning flag is set because the signal strength 6
is very high. Please check that the appropriate attenuator
plate is fitted to the Transmitter for the Tx/Rx operating
distance
The Analog Output is at Fault level (<1mA) because a
Beam-block state has persisted for longer than the
configured time limit
38
Dräger Polytron Pulsar 2
AMS operator screens and help texts
Figure 18 Configuration Properties of AMS Tag (Basic Set up)
7
6
5
4
1
3
2
02423892.eps
1
Final Assembly Number- Number that is used for
identification purposes, and is associated with the overall
Field Device.
3
Duct-mounted: Upper Range Value - The gas reading which 4
produces an Analog Output of 20mA and a Percent Range
of 100%. For a duct-mounted Dräger Polytron Pulsar 2 the
URV (in units of LFLm) is set equal to the path length
through the gas (in metres) so that the URV corresponds to
100%LFL.
Open Path: Upper Range Value - The gas reading which
produces an Analog Output of 20mA and a Percent Range
of 100%. It is not recommended to set the URV below 4.0
LFLm unless the operating environment is clean and dry, the
ambient temperature is relatively stable and the
measurement beam will not be obstructed.
5
Open Path: Lower Limit to which the Analog output Upper 6
Range Value can be set in any circumstances. It is not
recommended to set the URV below 4LFLm unless the
operating environment is clean and dry, the ambient
temperature is relatively stable and the measurement beam
will not be obstructed.
Upper limit of gas reading to which the Analog output Upper
Range Value can be.
7
Duct-mounted: For a duct-mounted Dräger Polytron Pulsar
the Upper Range Value (in units LFLm) is set equal to the
path length through the gas (in metres) so that the URV
corresponds to 100%LFL. Therefore this lower limit
determines the minimum permitted path.
Dräger Polytron Pulsar 2
2
Lower Range Value - For Dräger Polytron Pulsar 2 this
value is always zero.
39
AMS operator screens and help texts
Figure 19 Configuration Properties of AMS Tag (HART Setting)
1
2
3
02523892.eps
1
Universal Revision- Revision of the Universal Device
Description that the Field Device conforms to.
3
Number of Request Preambles- Number of Preambles
required from the Host request by the Field Device.
40
2
Field Device Revision- Revision of the Field Device Specific
Device Description that the Field Device conforms to.
Dräger Polytron Pulsar 2
AMS operator screens and help texts
Figure 20 Configuration Properties of AMS Tag (Device)
6
5
4
3
2
1
02623892.eps
1
Ethylene filters: Version of Dräger Polytron Pulsar 2
2
optimized to measure Ethylene (Ethene) in the beam path.
Standard filters: Version of Dräger Polytron Pulsar 2
optimized to measure most common hydrocarbons,
including the alkane series, but not Ethylene (Ethene).
3
Duct-mounted: This Dräger Polytron Pulsar is a version to 4
be installed within ventilation ducts. In this special situation
any gas is expected to be uniformly diluted across the beam
path. The Dräger Polytron Pulsar 2 can then be configured
to output 0-100 %LFL.
Open Path: This is the standard configuration of the Dräger
Polytron Pulsar 2, not the Duct-Mounted version.
5
Issue of the Receiver Main Processor firmware (23 = version 6
2.3 etc). This processor is used for the
Dräger Polytron Pulsar 2s measurement functions. Unlike
the separate processor used for HART communications it is
field-programmable for future upgrade.
Issue of the Receiver HART Processor firmware (23 =
version 2.3 etc). This processor is used for the
Dräger Polytron Pulsar 2s HART communication. It is
separate from the processor used for Dräger
Polytron Pulsar 2s measurement functions. It is fixed at the
time of manufacture.
Dräger Polytron Pulsar 2
41
AMS operator screens and help texts
Figure 21 Configuration Properties of AMS Tag (Configuration)
1
2
4
3
02723892.eps
1
If BB timeout to Fault is enabled a Beam-Block that persists 2
for longer than the configured time limit will cause the Analog
Output to be Fault level (<1mA).
If the Warning Current output is enabled then any of the
warnings listed below cause this output in place of 4.0 mA,
provided there is no gas reading exceeding the deadband.
Thus it provides an indication that more information is
available, but does not affect the measurement of gas. The
default setting 3.5mA causes the Dräger Regard Optical
card to display 'WARN'. The warnings are for: Optics;
Receiver Supply; Receiver temperature; Receiver
Alignment; Transmitter; Transmitter Alignment. Please refer
to the Dräger Polytron Pulsar 2 Status tab for their individual
descriptions.
3
Proper selection of Channel avoids interference with other 4
instruments nearby. Receiver and Transmitter must have
the same Channel whereas neighbouring
Dräger Polytron Pulsar 2s should be set to a different
Channel.
Auto-Zero Tracking allows small gas readings that persist
for a long time to be interpreted as zero drift and
automatically cancelled. It must not be enabled in
installations where a slow build up of gas concentration is
possible.
42
Dräger Polytron Pulsar 2
AMS operator screens and help texts
Figure 22 Configuration Properties of AMS Tag (Configuration)
1
2
3
4
5
02823892.eps
1
Auto Zero Tracking rate - When enabled AZT allows small 2
gas readings that persist for a long time to be interpreted as
zero drift and automatically cancelled. This value is changed
automatically when you change the URV for any DuctMounted Dräger Polytron Pulsar, or for an Open Path
Dräger Polytron Pulsar 2 below 4.0 LFL m.
If the beam is obstructed (or Dräger Polytron Pulsar 2 is
unable to provide a valid gas reading due to any other
reason) for longer than this configured time limit then the
Analog Output will be at Beam-block level (2mA).
3
4
Duration for Best Recent Strength. This is one of two
parameters Dräger Polytron Pulsar 2 uses to determine
whether the lenses need cleaning. Dirty lenses cause a
continuing loss of signal strength which is not immediately
distinguishable from the day-to-day variations caused by fog
etc. The Optics Warning is issued only when a signal loss
greater than the 'Reduction BRS' parameter persists for
longer than 'Duration BRS'.
Reduction in Best Recent Strength. This is one of two
parameters Dräger Polytron Pulsar 2 uses to determine
whether the lenses need cleaning. Dirty lenses cause a
continuing loss of signal strength which is not immediately
distinguishable from the day-to-day variations caused by fog
etc. The Optics Warning is issued only when a signal loss
greater than the 'Reduction BRS' parameter persists for
longer than 'Duration BRS'
5
Baseline deadband (LFLm) - The threshold gas reading that
causes the Analogue Output to rise above either 4mA or the
Warning Current. It ensures that insignificant fluctuations
around the baseline are not visible. This value is changed
automatically when you change the URV for any DuctMounted Dräger Polytron Pulsar, or for an Open Path
Dräger Polytron Pulsar 2 below 4.0 LFLm.
Dräger Polytron Pulsar 2
43
AMS operator screens and help texts
Figure 23 Configuration Properties of AMS Tag (Last zeroing)
9
8
7
6
1
5
2
4
3
02923892.eps
1
Proper selection of Channel avoids interference with other 2
instruments nearby. Receiver and Transmitter must have
the same Channel whereas neighbouring
Dräger Polytron Pulsar 2s should be set to a different
Channel.
Duration Dräger Polytron Pulsar 2 has operated. This total is
maintained by a non-volatile memory within the
Dräger Polytron Pulsar 2 Receiver. A period up to 2 hours
may be lost when the Receiver is re-powered.
3
Signal strength depends on the operating distance and the 4
presence of fog. Misalignment of the Transmitter and the
Receiver and dirt on their lenses can also affect this value.
Signal strength recorded at time of last zeroing. This value
is subsequently compared with the Best Recent Strength to
determine whether the lenses of the Transmitter and
Receiver need cleaning.
5
The value of 'Operation Hours' recorded the most recent
time the Dräger Polytron Pulsar 2 was zeroed.
6
The Dräger Polytron Pulsar 2 was set to this channel when
last zeroed.
7
The Dräger Polytron Pulsar 2 was last zeroed without the
data link connected between Receiver and Transmitter.
8
The Dräger Polytron Pulsar 2 was last zeroed with other
equipment than an ES (2/4Hz Enhanced Speed)
9
Device has never been zeroed. In this case further data
corresponding with the last zeroing are of no meaning.
44
Dräger Polytron Pulsar 2
AMS operator screens and help texts
Figure 24 Configuration Properties of AMS Tag (Gas table)
1
2
3
03023892.eps
1
Up to four Gas Tables can be factory-installed in the
Dräger Polytron Pulsar 2 Receiver. One of those can be
selected to best suit the application. Unsuitable selection
may lead to incorrect readings and alarm levels.
3
This of the four Gas Tables is being used to calibrate and
linearise the gas reading.
Dräger Polytron Pulsar 2
2
Standard of LEL values being used to calculate table
IEC:
IEC 60079-20
EN50054: EN50054
NIOSH:
NIOSH ICSC
not spec.: This table is empty.
unknown: Calibration standard unknown in this version of
the device description. Contact the supplier for an upgraded
version.
45
Declaration of Conformity
19
Declaration of Conformity
EC DECLARATION OF CONFORMITY
We
Draeger Safety UK Ltd
Drakes Court
Langage Business Park
Plymouth
PL7 5JY
England
Declare that
Gas Detector type GD8
In accordance with Directive 94/9/EC (Equipment and protective systems intended for use in potentially
explosive atmospheres), is in conformance with the EC-Type Examination Certificate
Sira 00ATEX1175
For equipment group and category
II 2 GD
EEx d[ia] IIC T6 (Tamb = -40oC to + 40oC)
EEx d[ia] IIC T5 (Tamb = -40oC to + 60oC)
Issued by
Sira Certification Service
Rake Lane, Eccleston, Chester, CH4 9JN, England
Notified body number 0518
The standards listed below have been checked against EN60079-0:2006, EN60079-11:2007,
EN61241-1:2006. The differences between them affecting the latest technical knowledge with regard to
this product having been addressed
Harmonized standards
EN 50014:1997 (amendments 1 & 2), IEC 60079-1:2007
EN 50020:1994, EN 50281-1-1:1998
The above mentioned product complies with the essential requirements, which are specified in the
directive 2004/108/EC on the approximation of the laws of the Member States relating to
electromagnetic compatibility.
The product of the declaration described above is in conformity with the requirements of the following
specifications
Harmonized standards
EN50270:2006, EN61000-4-3:2006
_______________________
Keith Chitty
Logistics Manager
Draeger Safety UK Limited
Blyth
Northumberland
NE24 4RG
United Kingdom
46
Tel:
+44 1670 352891
Fax:
+44 1670 356266
www.draeger.com
Registered in England No. 777464
DFO 137 issue 1.6 July 2011
Dräger Polytron Pulsar 2
Manufactured by Dräger UK Limited
Ullswater Close
Blyth Riverside Business Park
Blyth, Northumberland
NE24 4RG, United Kingdom
Tel. +44 (0)1670 352 891, Fax +44 (0)1670 540 033
www.draeger.com
Distributed in the US by Draeger Safety, Inc
101 Technology Drive
Pittsburgh, PA 15275-1057
USA
Phone +1 412 7 87 - 83 83, Fax +1 412 7 87 - 22 07
90 23 892 - TM 4675.892 en
© Dräger UK Ltd.
Edition 04 - August 2012 (Edition 01 - June 2006)
Subject to alteration
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