Drager Polytron Pulsar 2 Fixed Gas Detector

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.

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Tel: +44 (0)191 490 1547

Fax: +44 (0)191 477 5371

Email:

[email protected]

Website:

www.heattracing.co.uk

www.thorneanderrick.co.uk

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Content

For your safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Parts supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Understanding the system . . . . . . . . . . . . . . . . . . . .5

Installation of a

Dräger Polytron Pulsar 2 . . . . . . . . . . . . . . . . . . . . . .7

Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . .9

Cabling the Ex d certified connector . . . . . . . . . . . .13

Installing and commissioning the Dräger Polytron

Pulsar 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Planned maintenance . . . . . . . . . . . . . . . . . . . . . . .19

Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Receiver default settings . . . . . . . . . . . . . . . . . . . . .21

Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Accessories list . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Fault finding guide . . . . . . . . . . . . . . . . . . . . . . . . . .24

The Dräger Hand Held Terminal . . . . . . . . . . . . . . .27

The Dräger Polytron Pulsar 2 Digital

Interface AI500 . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Using the Dräger Polytron Pulsar 2 with HART . . .34

AMS operator screens and help texts . . . . . . . . . . .35

Declaration of Conformity . . . . . . . . . . . . . . . . . . . .46

Content

Dräger Polytron Pulsar 2 3

4

For your safety

1 For your safety

1.1

General safety statements

Strictly follow this Technical Manual

Any use of the device requires full understanding and strict observation of this Technical Manual and the Instructions for

Use provided with the device. The device is only to be used for the purposes specified herein and in the Instructions for Use.

Maintenance

The device must be inspected and serviced by experts at regular intervals and a record kept. Repair and general overhaul of the device may only be carried out by trained service personnel. We recommend that a service contract be obtained with Dräger for all repairs. Only authentic Dräger spare parts may be used for maintenance.

Observe the chapter “Maintenance“.

Use in areas subject to explosion hazards

Equipment and components which are used in 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.

!

WARNING

The Draeger Polytron Pulsar 2 has no userserviceable parts. Unauthorised opening can lead to a safety related failure of the unit.

1.2

Definitions of alert icons

The following alert icons are used in this document to provide and highlight areas of the associated text that require a greater awareness by the user. A definition of the meaning of each icon is as follows:

!

DANGER

Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

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!

!

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WARNING

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION

Indicates a potentially hazardous situation which, if not avoided, could result in physical injury, or damage to the product or environment. It may also be used to alert against unsafe practices.

NOTICE

Indicates additional information on how to use the product.

2 Intended use

2.1

Dräger Polytron Pulsar 2 open path gas detector

For stationary, continuous monitoring of hydrocarbon gases or vapours that may present an explosion hazard.

2.2

Explosion protection approvals

The explosion-protection approvals are valid for use of the device in gas/vapour-air mixture of combustible gases and vapours under atmospheric conditions. The 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.

i i

NOTICE

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)


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)

Dräger Polytron Pulsar 2

Parts supplied

3 Parts supplied

1 The Dräger Polytron Pulsar 2 detector comes in two parts a Transmitter and a Receiver; each supplied with an ABS moulded cover. Additionally the detector is supplied with either:

{

Flying leads and Ex e junction boxes.

{

Ex d certified plugs and sockets.

2 An Optical Attenuator for use on beam paths between 4 and 16 metres, NOTE this is only supplied with 4-60m

Transmitters.

3 An installation sheet and a quick start guide are supplied with the detector. Installation/operation manuals are also available through local distributors or by contacting Dräger.

4 You will also require a Commissioning kit which is ordered separately and includes:

{

{

{

{

{

Dräger Hand Held Terminal (HHT)

4mm Allen key

Test Sheets

HHT PC software

PC Cable (HHT version)

4 Understanding the system

4.1

Introduction

The Dräger Polytron Pulsar 2 detects hazardous releases of flammable hydrocarbons using the open path technique. The

Dräger Polytron Pulsar 2 it adds new and unique features which overcome common problems and annoyances in practical installations.

A Transmitter sends a beam of infrared light through the air to a Receiver. A release of hydrocarbon gases anywhere along the beam is detected because they absorb particular infrared wavelengths. Rain or snow in the air and dirt on the lenses do not cause a false indication of gas because they do not share the same characteristic wavelengths selectively. This 'open path' technique can achieve a density of coverage and a speed of response that would otherwise require an extensive array of point detectors. The new features that Dräger Polytron

Pulsar 2 adds includes the following:

1 The light is produced by pulsed eye-safe sources with a peak power of 30kW. With this high Transmitter power, the

Receiver is made immune from sunlight and resonance effects associated with vibration from rotating machinery.

Having more than one source ensures that, in the unlikely event of a failure, the system remains functional until the

Transmitter can be exchanged.

2 The performance of all open path instruments depends on the accurate aiming of the Transmitter and Receiver towards each other. Often the necessary detection paths require elevated and inaccessible locations. This can make the alignment difficult to do at the time of installation, and difficult to check subsequently when the supporting structures may have moved. The Dräger Polytron Pulsar 2 has internal sensors to measure the orientation of the

Transmitter with respect to the Receiver, and vice versa.

Besides being shown graphically on the Dräger Hand Held

Terminal to make installation simple, the directional measurements are available remotely during normal operation, allowing the alignment to be checked.

This feature also generates a pre-warning of changes in alignment before they can affect normal operation, and prevents a detector being commissioned before it is correctly aligned.

3 There is a communication path for digital signals from the

Receiver to the Transmitter. The Receiver can command the Transmitter to double its power and to increase the flash rate from 1Hz to 4Hz, allowing an eight-fold increase in light flux when visibility is reduced by bad weather or

(most importantly) by the mist of condensate often present in real incidents. The higher flash rate is also triggered by the first indication of gas, allowing a validated gas reading to be output in a reduced response time. The link also allows the alignment display for both Transmitter and

Receiver to be viewed at both locations, making it easy for one person to install or maintain the system.

4 Open path instruments can suffer interference if a receiver

'sees' another transmitter mounted nearby or in line with the intended one. The Dräger Polytron Pulsar 2 can be switched to separate frequencies analogous to radio channels. Each Receiver locks onto its own Transmitter and ignores light from its neighbours.

5 The Receiver incorporates a data-logger with a non-volatile memory, readable locally or remotely. The data provides a valuable aid for diagnosing practical problems and preventing unnecessary maintenance work. Internally the information is used to monitor slow trends of signal strength and provide a pre-warning signal when the lenses will require cleaning, unaffected by temporary weather conditions.

In addition to these electronic enhancements, Dräger

Polytron Pulsar 2 has a mechanical design that provides exceptional stability and ease of adjustment. The head units containing the optical components are mounted in lockable gimbals that allow separate vertical and horizontal adjustments with the other axis clamped. Each axis can be adjusted with a controlled degree of friction provided by PTFE rings then locked solid without disturbing the setting. An ABS moulded cover provides mechanical protection and helps minimise the temperature rise of the internal electronics.

4.2

Transmitter

The Transmitter is a three-wire device, with cable terminals for

(i) 24Vdc power; (ii) digital communication; and (iii) power and signal common. The connector for the Dräger Hand Held

Terminal allows data coming from the Receiver to be viewed at the Transmitter, including the graphical display of orientation and signal strength needed for alignment. The Dräger Hand

Held Terminal can also configure the Transmitter with its operating channel and a user-entered tag reference. The 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.


Understanding the system

4 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.

5 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 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.

6 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


5.1

Choosing the path of the beam

1 The siting of an open path gas detector is often not as critical as a point detector, since the released gas only has to find its way into some portion of the beam instead of to a particular point. However siting is still an important consideration. Guidance for siting is contained in EN

60079-29-2.

2 Dräger Polytron Pulsar 2 is immune to sunlight so there is no need to take account of the sun position when siting detectors.

3 The density of the gas to be detected has to be considered.

Methane is lighter than air and may be expected to rise, unless released at a low temperature or in a mixture with a heavier gas like Carbon Dioxide. Likewise heavier hydrocarbons may be expected to fall. However such simple considerations as buoyancy may not be a reliable indicator of gas movement in practical situations. Gas leaking from high-pressure systems entrains with it a much larger volume of ambient air, forming a mixture that may be flammable and almost neutrally buoyant. In these circumstances it is the natural air currents or forced ventilation that control the motion of the plume or cloud.

Where air movements are unpredictable it may be necessary to use separate beam paths to cover different possibilities.

4 The distance between the Transmitter and Receiver should agree with the model selected (i.e. 4-60m, 30-120m or 100-

200m). Note that the Optical Attenuator should be fitted below 16 metres.

5 The beam path and immediate surround should be kept free of obstructions that might hinder the free movement of air in the protected area or block the infrared beam. A clear path of 25cm diameter or greater is recommended. For maximum availability it is also recommended to avoid the following:

{

Smoke stacks, chimneys and exhausts.

{

{

{

{

{

{

Steam vents and plumes.

Walkways and areas where personnel muster or 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.


Installation of a Dräger Polytron Pulsar 2

Figure 1: Wall mounting of Dräger Polytron Pulsar 2 with Ex e junction box

Rear cover

FRONT VIEW

Front cover fitted

216

Gimbal Clamps

338

71

Locking screws for horizontal adjustment.

Locking screws for vertical adjustment.

Mounting bolts M8 max.

Terminal Box cover bolts.

DO NOT OPEN WHEN ENERGISED

Terminal Box fixing bolts

Electrical connection via M20 certified

Ex e cable glands - not supplied.

For connection options refer to figure 4, 5 and 6.

SIDE VIEW

Front cover removed

Figure 2: Wall mounting of Dräger Polytron Pulsar 2 with eX link plug and socket

Rear cover

FRONT VIEW

Front cover fitted

216

Gimbal Clamps

338

71

Locking screws for horizontal adjustment.

Locking screws for vertical adjustment.

Mounting bolts M8 max.

eX Link plug

Minimum bend diameter

= 6 x cable diameter

Factory fitted Ex e certified cable gland for Power/Signal cable

00223892.eps

SIDE VIEW

Front cover removed

Front cover fixing screws 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.


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

550

558

546

535

525

500

450

400

350

357

367

378

388

517

509

502

496

492

488

451

485 484

483

472

483

462

441

409

420

430

399

346

336

Tx current consumption

Rx current consumption

300

18 19 20 21 22 23 24 25

Voltage DC

26 27 28 29 30

004223952.eps



18 AWG:

17 AWG:

16 AWG:

15 AWG:

14 AWG:

13 AWG:

12 AWG:

11 AWG:

10 AWG:

6.1

Dräger Polytron Pulsar 2 maximum permissible power cable lengths

The following tables give the maximum cable lengths for differing worst case power supply voltages and core sizes.

In using this information please note that the worst-case

(lowest possible) supply voltage should be used not the nominal stated.

The lengths stated are determined by the power supply cores.

If cable size and distance become excessive it may be more economic to install a local power supply. There is no practical limit on the distance for the signal cables, although the 4-20 mA loop resistance is limited to 500 Ω total

Cable run in metres: To both Transmitter AND Receiver

Worst case supply:

1 mm

2

:

1.5 mm

2

:

2.5 mm

2

:

20V 21V 22V 23V 24V 25V 26V...

30V

74 98 123 147 172 197 221

111

184

147

246

184

307

221

369

258

430

295

491

332

553

4 mm

2

:

295 393 491 590 688 786 885

Cable run in metres: To Transmitter only


1 mm

2

1.5 mm

2

:

2.5 mm

2

:

4 mm

2

:

:

20V 21V 22V 23V 24V 25V 26V...

30V

114 152 189 227 265 303 341

170

284

455

227

379

606

284

473

758

341

568

909

398

663

455

758

511

852

1061 1212 1364

18 AWG:

17 AWG:

16 AWG:

15 AWG:

14 AWG:

13 AWG:

12 AWG:

11 AWG:

10 AWG:

94 125 156 187 218 249 281

118 157 197 236 275 315 354

149 198 248 297 347 397 446

188 250 313 375 438 500 563

236 315 394 473 552 631 709

298 398 497 596 696 795 895

376 501 627 752 877 1003 1128

474 632 790 948 1106 1265 1423

598 797 997 1196 1395 1595 1794

61

77

96

81 101 121 142 162 182

102 128 153 179 204 230

129 161 193 225 257 289

122 162 203 243 284 324 365

153 205 256 307 358 409 460

193 258 322 387 451 516 580

244 325 407 488 569 650 732

308 410 513 615 718 820 923

388 517 646 776 905 1034 1164

Cable run in metres: To Receiver only


20V 21V 22V 23V 24V 25V 26V...

30V

1 mm

2

:

1.5 mm

2

:

210 280 350 420 490 559 629

315 420 524 629 734 839 944

2.5 mm

2

:

4 mm

2

:

524 699 874 1049 1224 1399 1573

839 1119 1399 1678 1958 2238 2517

18 AWG:

17 AWG:

16 AWG:

15 AWG:

14 AWG:

13 AWG:

12 AWG:

11 AWG:

10 AWG:

173 230 288 345 403 460 518

218 290 363 435 508 581 653

275 366 458 549 641 732 824

346 462 577 692 808 923 1039

437 582 728 873 1019 1164 1310

551 734 918 1101 1285 1468 1652

694 926 1157 1388 1620 1851 2083

875 1167 1459 1751 2043 2334 2626

1104 1472 1840 2208 2576 2944 3312



Cable run in feet: To booth Transmitter AND Receiver


1 mm

2

:

20V 21V 22V 23V 24V 25V 26V...

30V

242 322 403 484 564 645 725

1.5 mm

2

2.5 mm

2

:

:

363 484 605 725 846 967 1088

605 806 1008 1209 1411 1612 1814

4 mm

2

:

967 1290 1612 1935 2257 2580 2902

Cable run in feet: To Receiver only


1 mm

2

:

20V 21V 22V 23V 24V 25V 26V...

30V

688 918 1147 1377 1606 1835 2065

1.5 mm

2

:

1032 1377 1721 2065 2409 2753 3097

2.5 mm

2

:

1721 2294 2868 3441 4015 4589 5162

4 mm

2

:

2753 3671 4589 5506 6424 7342 8259

18 AWG:

17 AWG:

16 AWG:

15 AWG:

14 AWG:

13 AWG:

12 AWG:

11 AWG:

10 AWG:

18 AWG:

17 AWG:

16 AWG:

15 AWG:

14 AWG:

13 AWG:

12 AWG:

11 AWG:

10 AWG:

199 265 332 398 464 531 597

251 335 418 502 586 669 753

317 422 528 633 739 844 950

399 532 665 798 931 1064 1197

503 671 839 1007 1174 1342 1510

635 846 1058 1269 1481 1692 1904

800 1067 1334 1601 1867 2134 2401

1009 1346 1682 2018 2355 2691 3027

1273 1697 2121 2545 2969 3393 3818

Cable run in feet: To Transmitter only


1 mm

2

:

20V 21V 22V 23V 24V 25V 26V...

30V

373 497 621 746 870 994 1118

1.5 mm

2

2.5 mm

2

:

:

559 746 932 1118 1305 1491 1678

932 1243 1553 1864 2175 2485 2796

4 mm

2

:

1491 1988 2485 2983 3480 3977 4474

18 AWG:

17 AWG:

16 AWG:

15 AWG:

14 AWG:

13 AWG:

12 AWG:

11 AWG:

10 AWG:

567 755 944 1133 1322 1511 1700

714 952 1191 1429 1667 1905 2143

901 1201 1501 1802 2102 2402 2702

1136 1515 1893 2272 2651 3029 3408

1432 1910 2387 2865 3342 3820 4297

1806 2408 3010 3613 4215 4817 5419

2278 3037 3796 4555 5315 6074 6833

2872 3830 4787 5744 6702 7659 8616

3622 4829 6036 7244 8451 9658 10865

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.

307 409 511 614 716 818 921

387 516 645 774 903 1032 1161

488 651 813 976 1139 1301 1464

615 820 1026 1231 1436 1641 1846

776 1035 1293 1552 1810 2069 2328

978 1305 1631 1957 2283 2609 2935

1234 1645 2056 2467 2879 3290 3701

1556 2074 2593 3112 3630 4149 4667

1962 2616 3270 3924 4578 5231 5885



Figure 4: Connection diagram powered via Transmitter

Transmitter terminal box connections

Receiver terminal box connections cable screen

+24V dc

0-20mA

Digital

(see note 5)

Common

To

Control

Equipment

E

S

7

6

E

S

7

6

5

4

3

2

1

5

4

3

2

1

+24Vdc

0-20mA

Digital

Common cable screen

Link Cable to Receiver

Ex e gland supplied fitted

To

Transmitter 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

Blanking

Plug supplied

To

E

S

7

6

E

S

7

6

5

4

3

2

1

5

4

3

2

1

Receiver head unit

Link Cable to Transmitter

+24Vdc

0-20mA

Digital

Common cable screen

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


Receiver terminal box connections

Blanking

Plug supplied

E

S

7

6

E

S

7

6

5

4

3

2

1

5

4

3

2

1

+24Vdc unused (see note 5)

Digital

Common cable screen cable screen

+24Vdc unused (see note 5)

Digital

Common

LINK CABLE

E

S

7

6

E

S

7

6

5

4

3

2

1

5

4

3

2

1 screen

+24V dc

0-20mA

Digital (see note 5)

Common

To

Control

Equipment


To


To

Receiver head unit

NOTES:


2) Entry points for Link Cable and Control Equipment may be

interchanged provided that the correct connections are maintained.


CAUTION




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


Cabling the Ex d certified connector

Figure 6: Connection diagram powered individually

cable screen


E

S

7

6

E

S

7

6

5

4

3

2

1

5

4

3

2

1

Blanking

Plug supplied

See note 2

Blanking

Plug supplied

Receiver terminal box connections

E

S

7

6

E

S

7

6

5

4

3

2

1

5

4

3

2

1 cable screen


To


To

Receiver head unit

(See notes 4 and 5)

NOTES:


2) Entry points may be changed provided that the correct connections

are maintained.


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

CAUTION



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.

i i

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.



Figure 7: Exploded view of the socket

1

4

3

2

5

7

6

9

8

10

11

12

00823892.eps

1 Socket sleeve

3 Thrust washer

5 Inner gland nut

7 Clamp cone

9 Inner thrust washer

11 Contact pins

2 Outer cap nut

4 Outer seal

6 Sleeve

8 Inner seal

10 Insulation sleeve

12 Socket insert

7.1

Ex d socket cable specification

The Ex d socket supplied with the Dräger Polytron Pulsar 2 may be used with cables of the following dimensions:

External sheath

Internal sheath

SWA diameter

Cable core size

12 - 21mm

8.5 - 16mm

0 - 1.25mm

1.5 - 2.5mm

7.2

Preparing and fitting the cable

1. Strip and prepare the cable to the required lengths, typical dimensions are given in Figure 9.

2. Place the socket components (outer cap, thrust washers, outer seal etc.) onto the cable (see Figure 7), whilst 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)

i i

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

7.2.1

Figure 8

1

4

2

3

00923892.eps

1 Contact end (connects with plug)

2 Hexagonal collar

3 Crimp end (fit to cable)

4 Colour coded bar z

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).

i i

NOTICE

IMPORTANT

It is critical that each pin is fitted to the correct location; failure to do so may result in damage to the Dräger

Polytron Pulsar 2.



Figure 9: Cable preparation and wiring

8

30

35

50mm

Pair 1 core to CEAG socket pin 4 (-ve common)

Pair 1 core to CEAG socket pin 1 (digital)

Pair 2 core to CEAG socket pin 3 (4 - 20mA)

Pair 2 core to CEAG socket pin 2 (+ve 24V)

Outer sheath

Steel/wire braid

Protective sleeve

01023892.eps

2

Rear of socket insert

1 1

Front of eXLink socket (insert fitted)

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.



Figure 10: Connection diagram powered individually using CEAG Ex d connector

Transmitter Connections

3

2

1

Rear of eXLink socket

4

Receiver Connections

Rear of eXLink socket

2

3

4

1

(See notes 2 and 3)

NOTES:


2) These connections are typically made in the marshalling cabinet in the non-hazardous area.



CAUTION



01223892.eps


Installing and commissioning the Dräger Polytron Pulsar 2

8 Installing and commissioning the


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.

i i

NOTICE

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.

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.


Installing and commissioning the Dräger Polytron Pulsar 2

i i

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.

8.2

Alignment and zeroing

The Dräger Polytron Pulsar 2 must be aligned and zeroed when it is first installed and whenever the Transmitter or

Receiver are moved. Before carrying out the electronic alignment with the Dräger Hand Held Terminal, check whether the Attenuator Plate needs to be fitted (see above) and that the units point towards each other as accurately as possible by eye. This will save time by reducing the number of steps needed and ensure that you find the strong central peak. Be aware that weaker, false peaks can occur when the

Transmitter and/or Receiver point away from the correct axis, for instance when light from the Transmitter reflects off an adjacent surface.

To access the Transmitter and Receiver gimbals, Remove the cover screws and lift off the cover. Loosen the eight clamping screws on the gimbals assembly, and then retighten them gradually until the head unit will move smoothly in all directions but remain in position.

8.2.1

Step 1. Initial Receiver alignment

Select

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

UP

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.

8.2.2

Step 2. Transmitter alignment i i

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

LENS LEFT LENS RIGHT

Correctly

Aligned

LENS

DOWN

01523892.eps

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.


Planned maintenance

At the left of the Alignment screen the Transmitter 'target' indicates the degree of misalignment but not (unlike the

Receiver) its direction:

CORRECTLY

ALIGNED

MISALIGNED

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

Step 3. Final Receiver alignment

As you return to the Receiver use the portable detector to check that the beam path is free of gas, in preparation for the zeroing procedure that follows. At the Receiver, make any final adjustment needed to centre the display. This is more likely to be necessary if the initial alignment was poor, or if the operating distance is short, causing movements of the

Transmitter to have a proportionately larger angular effect at the Receiver. Replace the Receiver cover, ensuring all the screws are tight. Leave the Dräger Hand Held Terminal connected for Step 4.

8.2.4

Step 4. The Zeroing Procedure

The Zeroing Procedure must be carried out whenever the

Dräger Polytron Pulsar 2 is cleaned or realigned. It checks the installation and stores measurements for the normal situation that the path is free of gas and has good visibility. These form the standards of comparison to detect dirt on the lenses and gas in the path, so it is essential that the beam is unobstructed by people or objects and there is no fog or gas in the air. For preference choose a time when the weather is dry, the temperature moderate, and the Dräger Polytron Pulsar 2 has been powered for at least 30 minutes.

Select

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 check that the analogue circuit is not prevented from reaching full scale.

8.2.5

Step 5. Verification with Test Sheets

The purpose of the Test Sheets is described in Understanding

The System. Hold a stack of five immediately in front of the

Receiver lens. Verify from the Dräger Hand Held Terminal screen and from the control equipment that the complete system responds correctly, as if to gas. If the reading is off scale, remove sheets one by one until it is on scale. Record the mean reading, together with the serial numbers of the

Transmitter, Receiver and Test Sheets for future reference.

Recording the Test Sheet readings enables you to check subsequently that the response to gas has not been affected in any way. You may also wish to introduce the Sheets one by one to check correct operation of the control equipment at intermediate readings. If required, similar checks can be carried out with real gas using the Gas Check Kit GCK400.

Unlock the alarm activation at the control device to put the system back to normal operating mode.

9 Planned maintenance

1 The Dräger Polytron Pulsar 2 has been designed so that it will give long and reliable service with the minimum of maintenance. The Dräger Polytron Pulsar 2 will warn the operator if the Optics become contaminated or if it becomes misaligned for any reason.

2 Depending on the application and the environment as well as the work practices at the site planned maintenance consists ofz z

Checking 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.


Specification

10 Specification

Housing

Electro-polished ANSI type 316 marine grade stainless steel

Brackets

Outputs

Connections

Power Supply

Electro-polished ANSI type 316 marine grade stainless steel

Cover

Firmware

ABS moulded plastic

Lens

Source

Calibrations

Response time

Interference

Treated optical glass.

Integral Cable

(if fitted)

Span

Armoured, flame retardant, halogen free, MUD resistant

Operating range

4 to 60m, 30 to 120m or 100 to 200m Transmitter to Receiver

Operational limit

-40 °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, switchable 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 concentration. 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.

Alignment

Mounting

Built in sensor system with separate “radar” displays on Dräger Hand Held Terminal screen for Transmitter and Receiver alignment. Zeroing not possible unless correctly aligned (≤ ± 0.15°). Tolerance ± 0.6° before

Beam Block.

Dual clamping gimbals assembly.

Upgradeable by portable PC connected to local Dräger Hand Held Terminal port or remote AI500 interface.

Self configuring current sink or source. Fully linearised 4-20 mA gas signal with Fault at 0 mA, Beam-block at 2 mA, and a configurable Pre-warning for dirty or misaligned optics, broken Rx-Tx link, or first lamp failure

(0 to 5 mA, default 3.5 mA). LEL.m = ((I (in mA)-4 mA)/ 16 mA * (full scale)). Overrange at 20.5 mA. Output is self-configuring for current-source and current-sink circuits. Interrogation/diagnostics of the detector, locally via the Dräger Hand Held Terminal device, or remotely via 4 th

-wire digital link to AI500.

Transmitter: three wire (3rd wire optional for Rx-Tx digital link).

Receiver: four wire (4th wire optional for digital communications and Rx-Tx link).

Voltage: 18 - 30VDC (24VDC nominal)

Power Consumption Rx max: 5 W

Tx max: 13W

Current: ≤ 0.95 A typical @ 24 volts DC, , inrush current: 1.5A

Temperature

Storage

Repeatability

Linearity Error

Optics

Data-logger

-40 to 60 °C operating, with integral sun cover. Flare radiation ≤ 2kW/m

2

at ≥30° to optical axis continuously;

≤ 3kW/m

2

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.

Dimensions

Weight

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


Receiver default settings

11 Receiver default settings

Configuration

Beam Block delay

Beam block to fault

Gas calibration (Standard Pulsar)

Gas calibration (Ethylene Pulsar)

4-20mA span

Auto Zero Tracking rate

Dead-Band

Range

10 - 255 seconds

0 - 255 minutes

Table 1= Methane

Table 2 = Propane

Table 3 = Vacant

Table 4 = Vacant

Table 1 = Ethylene

Tables 2, 3, 4 = Vacant

4 - 8 LFLm for 20mA

0 - 12 LFLm per hour

Default setting standarrd receiver

60 seconds

60 minutes

Table 1 Methane

Table 1 Ethylene

Static pre-warning current

Beam block time out to Fault

Static pre-warning

Auto Zero Tracking

0 - 0.5 LFLm

0 - 5mA

On/off

On/off

On/off

8 LFLm

0.05 LFLm per hour

1

0.3 LFLm

1

3.5mA

On

On

On

1 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.


Certification

12 Certification

Dräger Polytron Pulsar 2 Transmitter and Receiver

i i

NOTICE

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



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-

Anti static-

Glass filled polyester, flame retardant to

IEC92.1, UL94V0

Ingress protection- IP66

<10

9

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


Accessories list

13 Accessories list

Part number Dräger Polytron Pulsar 2 Accessories

2350298

2350306

Junction Box Dräger Polytron Pulsar 2 ATEX

AI500 Digital Interface Unit for Dräger Polytron Pulsar 2

2350325

2350326

2350327

2350238

Dräger Polytron Pulsar 2 Alignment Kit, ATEX/CSA

Adapter AI500 to HHT or PC

Dräger Polytron Pulsar 2 PC Software with cable (supports Pulsar, AI500 and HHT)

Data Wand for AI500

2350339

2350322

2350505

Attenuator plate AP800

Dräger Polytron Pulsar 2 Remote Junction Box/HHT Kit

Dräger Polytron Pulsar 2 Alignment Telescope

2350518

2350521

Gas Cell Kit single pass - Methane and Propane

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

2350495

Dräger Polytron Pulsar 2 ATEX 30-120m (Complete TX + RX)


2350499

2350500

2350501

2350502

Dräger Polytron Pulsar 2 ATEX 4-60m (TX only)



Dräger Polytron Pulsar 2 ATEX 4-120m (RX only)

2350503

2350340

2350341


Dräger Polytron Pulsar 2 ATEX 4-120m (RX only Ethylene)


Part number Dräger Polytron Pulsar 2 with ABS moulded cover and Ex d certified plug and socket connectors

2350496

2350497



2350498

2350504

2350506

2350507





2350508

2350509

2350342

2350343






Fault finding guide

14

i i

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.

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.


Fault finding guide

14.3 Problems relating to the Transmitter

Symptoms

The detector outputs Beam-block. The

HHT receives data only a few times a minute. The Transmitter is not flashing

Cause

The Transmitter is not powered

Action

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 detector outputs Beam-block. The

HHT receives data only a few times a 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 and Receiver are configured to different Channels

Reconfigure the Transmitter and/or the

Receiver so that their Channels are the same

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

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

When the detector is switched to Alignment Mode the Transmitter flash rate fails to change to four per second, but remains at once per second

The link is not connected between the

Receiver and the Transmitter

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 prevents the detector being aligned and zeroed. Fault Mode is designed to allow 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

Confirm that the HHT indicates Transmitter

Fault. Further action as shown above for this Pre warning

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 detected that the supply voltage is too low.

The test is more stringent than an external voltmeter test because it is made with the heater switched on and at the peak of the charging cycle

Check the supply voltage at its source and that the cable run does not exceed the maximum specified for the core size used

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

Receiver are not sufficiently rigid

Provide additional bracing for the mountings. Notice that their rigidity is more important than their strength, changes in direction more important than translational movements


Fault finding guide

14.4 Problems relating to the Receiver

Symptoms

The detector output is at Fault (<1mA).

The HHT receives no data

Cause

The Receiver is not powered

Action

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 completed

Align and zero the detector in the normal way

The detector fails to complete the self-zeroing sequence. The HHT shows the Optics flag is set.

An internal check has detected abnormally high signal strength. This is normally 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 detector behaves erratically. It changes unpredictably from normal operation with the HHT showing a strong signal 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

The Receiver is seeing light from more than one Transmitter on the same Channel

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 misalignment of the Receiver also serve to prevent its giving false gas readings due to a 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

Check for causes of partial obstruction such as a vehicle, a crane or a build-up of snow or ice intruding into the beam path

We have installed several detectors with similar configurations. One shows a lower response to the plastic test sheets than the others

The Receiver has become sufficiently misaligned to cause a Beam-block in a time too short for the warning to be generated

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 gas, not for solid plastic. The sheets are intended to demonstrate that the detector 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

If required, the gas response can be tested directly and in situ using the gas cells supplied in the GCK400 kit


The Dräger Hand Held Terminal

15

!

The Dräger Hand Held Terminal

WARNING

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.

15.3 Operation

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.



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)

The

ON

appropriate. The

TAG

ON

option is blanked if data from the Receiver shows that the normal link is provided. Otherwise it toggles to

OFF

as 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[\]./

i i

NOTICE

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

2 View current settings

READ

SETS

3 Connect to new Tx or Rx

NEW

4 More…

The

SETS more

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 manual.

ALIG

and

ZERO

is explained in “Installing and

Commissioning the Dräger Polytron Pulsar 2” section of the

RX MEMORY MENU

1 Enter Rx tag (and channel to match Tx)

2 Read Logger data from Rx into memory

TAG

LOG

3 Send User-Settings in memory to Rx

USER

4 More…

The

TAG more

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 -

+

-

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 with

more

STOP

without exiting this menu, or 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

2 Enter new tag and node

TAG

READ

3 Connect to new AI500

NEW

4 Link via this AI500 to Rx A, B, C, or D

TAG

LINK

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

3 View note for new users

NOTE

SETS

4 Connect to Tx, Rx or AI500

The

PC

TR/A

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.



15.9 Specification

Dimensions: 133 x 145 x 75mm

Weight: 800g

Lead length: 1 metre

Temperature: -20 °C to 45 °C (operating) for T4 temperature classification

Temperature: -20 °C to 60 °C (operating) for T3 temperature classification

Weather seal: IP66/67

Screen type: Reflective LCD

Graphics:

Text:

Battery:

128 x 128 pixels

16 lines of 21 characters

Duracell or Procell MN1604 Sealed Alkaline 9V

Battery life: 10 hours continuous use at 21 o

C

Materials-

Enclosure: Polycarbonate

Flying Lead: Outer sheath, PVC

Cable gland: Polyamide

Connectors: Nickel-plated brass

Switches: 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.

!

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.



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

30

01823892.eps

Dräger Polytron Pulsar 2

The Dräger Polytron Pulsar 2 Digital Interface AI500

16 The Dräger Polytron Pulsar 2

Digital Interface AI500


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.

16.2 Environmental

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

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

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 EIA-

RS-422/485 bus.

16.7 Connector 1: Power AND Dräger

Polytron Pulsar 2 Digital I/O

Terminal:

1

2

3

6

7

4

5

8

9

10

11

12

Function:

Common

Digital I/O Dräger Polytron Pulsar 2 Receiver A

Common

Digital I/O Dräger Polytron Pulsar 2 Receiver B

Common

Digital I/O Dräger Polytron Pulsar 2 Receiver C

Common

Digital I/O Dräger Polytron Pulsar 2 Receiver D

Common (Power supply 0V)

Common (Power supply 0V)

Power supply +24V

Power supply +24V

Removable polarised connector.

Phoenix Contact MST BT2.5/12-ST-5.08, 2.5mm

2

(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):

Logic 0 (Space):

Data rate:

Protocol:

Data integrity:

0mA

5mA

1200 bits / s

Proprietary

CRC-16 checksum



16.8 Connector 2: EIA-RS-422/485 Serial Port

Terminal:

13

14

15

16

17

18

EIA-RS-422/485 Function:

0V (ref)

+5V dc out (100mA max)

TXB (+)

TXA (-)

RXB´ (+)

RXA´(-)

Removable polarised connector

Phoenix Contact MC 1.5/06-ST-3.81, 1.5mm

2

(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.

16.9 Connector 3: Hand Held Terminal Port

Terminal:

19

20

21

22

Optical Isolator Function:

Emitter (volt-free output -)

Collector (volt-free output +)

Anode (volt-free input +)

Cathode (volt-free input -)

Removable polarised connector

Phoenix Contact MC 1.5/06-ST-3.81, 1.5mm

2

(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.

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.



Figure 13: Connection from the field device to the AI500

Transmitter

HAZARDOUS AREA

Link cable (4-wire)

Detector A

(see note 3)

Receiver

NOTES:

1) One to four Pulsar detectors may be connected to each

Digital Interface.

2) Up to 32 Digital Interfaces may be interconnected.

3) For alternative Pulsar wiring options refer

to manual.

4) Loading of +5V dc output must not exceed 100mA.

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

(see note 1)

Detector D

Detector C

Detector B

NON-HAZARDOUS AREA

+24V dc

Common

(Instrument Earth)

RS-485 connection to

2-wire system

RS-485

Master

(see note 5)

Detector A

+24V dc

0-20mA

Digital

Common

Instrument

Earth

IR

OUT

1 2 3 4 5 6 7 8 9 10 11 12

A B C D

PULSAR DIGITAL I/O

+ +

18-32V dc

Draeger PLMS Ltd.

Plymouth UK

RS-422 / 485

PORT

19 DIGITAL

INTERFACE

TYPE AI500

13

14

0V (ref)

20

21

+5V out

15 TXB (+)

16

TXA (-) 22

This device complies with part 15 of the FCC Rules.

Operation is subject to the following two conditions:

1) This device may not cause harmful interference, and

2) This device must accept any interference received,

17

18 including interference that may cause undesired operation.

RXB' (+)

RX A'(-)

(see note 4)

(see note 2)

RS422/485 - 2W | 4W

(see note 6)

RS-422/485 connection to

4-wire system

RS-422/485 Master

(see note 5)

(see note 4)

(see note 2)

(see note 7)

01923892.eps


Using the Dräger Polytron Pulsar 2 with HART

17 Using the Dräger Polytron Pulsar 2 with HART


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

Pu lsar Receivers or oth er HART devices

1 to 32 (m ax 256)

PC running Em erson

AMS soft ware

1

32

0 -20m A analogue current loops with

HART digita l signals

HART m ultiplex er

MTL4 841 + 2 x MTL 4842 (m ax 16)

RS232 / RS485 converter

1

RS 485 m ultidrop

(m ax 31 x

MTL4 841)

32

Nor m al 0-20m A outputs to control equ ipm ent

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

02023892.eps

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.


18 AMS operator screens and help texts

Figure 15 Process variables of AMS Tag

1 2

13

12

11

10

AMS operator screens and help texts

3

4

5

6

7

9 8

1 Measurement of concentration times path length, giving an 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.

02123892.eps

2 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

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.)

4 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

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.

7 Message- Text that is associated with the Field Device. This text can be used by the user in any way. There is no recommended use.

6 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.

8 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 0-

100% LFL for 4-20mA, this number can be read directly as

%LFL



9 Upper Range Value - The gas reading which produces an

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.

10 Analog Output Value- Value that tracks the Digital Value representation, under normal operating modes.

11 The Supply voltage measured by the Receiver is the applied voltage less the voltage drop in the cable.

12 Signal strength depends on the operating distance and the 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.



Figure 16 Status of AMS Tag (Dräger Polytron Pulsar 2 Status)

4

3

2

7

6

5

9

8

1

02223892.eps

1 Please state this error code if you need assistance from the service support centre.

2 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 low. This is not yet affecting the operation.

6 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.

This is not yet affecting the operation.

8 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.



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, the cause has been removed and the Dräger

Polytron Pulsar 2 is expected to restart operation in a few seconds.

2 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 could be due to dense fog or an obstruction in the beam path.

4 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 is very high. Please check that the appropriate attenuator plate is fitted to the Transmitter for the Tx/Rx operating distance

6 The Analog Output is at Fault level (<1mA) because a

Beam-block state has persisted for longer than the configured time limit



Figure 18 Configuration Properties of AMS Tag (Basic Set up)

7

6

5

4

3

2

1

02423892.eps

1 Final Assembly Number- Number that is used for identification purposes, and is associated with the overall

Field Device.

2 Lower Range Value - For Dräger Polytron Pulsar 2 this value is always zero.

3 Duct-mounted: Upper Range Value - The gas reading which 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.

4 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

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.

6 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.



Figure 19 Configuration Properties of AMS Tag (HART Setting)

1

2

3

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.

02523892.eps

2 Field Device Revision- Revision of the Field Device Specific

Device Description that the Field Device conforms to.



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 optimized to measure Ethylene (Ethene) in the beam path.

2 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 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.

4 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

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.

6 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.



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 for longer than the configured time limit will cause the Analog

Output to be Fault level (<1mA).

2 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 instruments nearby. Receiver and Transmitter must have the same Channel whereas neighbouring

Dräger Polytron Pulsar 2s should be set to a different

Channel.

4 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.


Figure 22 Configuration Properties of AMS Tag (Configuration)


3

4

5

1

2

02823892.eps

1 Auto Zero Tracking rate - When enabled AZT allows small 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 Duct-

Mounted Dräger Polytron Pulsar, or for an Open Path

Dräger Polytron Pulsar 2 below 4.0 LFL m.

2 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 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'.

4 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 Duct-

Mounted Dräger Polytron Pulsar, or for an Open Path

Dräger Polytron Pulsar 2 below 4.0 LFLm.



Figure 23 Configuration Properties of AMS Tag (Last zeroing)

5

4

9

8

7

6

1

2

3

02923892.eps

1 Proper selection of Channel avoids interference with other instruments nearby. Receiver and Transmitter must have the same Channel whereas neighbouring

Dräger Polytron Pulsar 2s should be set to a different

Channel.

2 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 presence of fog. Misalignment of the Transmitter and the

Receiver and dirt on their lenses can also affect this value.

4 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.



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.

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.

3 This of the four Gas Tables is being used to calibrate and linearise the gas reading.


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 = -40 o

C to + 40 o

C)

EEx d[ia] IIC T5 (Tamb = -40 o

C to + 60 o

C)

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

_______________________

Keith Chitty

Logistics Manager

Draeger Safety UK Limited

Blyth

Northumberland

NE24 4RG

United Kingdom

Tel: +44 1670 352891

Fax: +44 1670 356266 www.draeger.com

Registered in England No. 777464

Tel: +44 (0)191 490 1547

Fax: +44 (0)191 477 5371

Email:

[email protected]

Website:

www.heattracing.co.uk

www.thorneanderrick.co.uk


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