Dräger Polytron 3000 Instructions For Use Manual

D

Dräger Polytron 3000

(approved as type P3S)
Transmitter for electrochemical Sensors

Instructions for Use

ST–691–2002.eps

Contents

2

Contents

For Your Safety

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Intended Use

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Design

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Installing the transmitter

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Preparing for installation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Installing the docking station

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

How to install the electrical connections

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Installing the 4 to 20 mA current loop on the transmitter

. . . . . . . . . . . . . . . . . . . . 8

Connecting to the central unit

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Installing the transmitter in areas subject to explosion hazards of zone 0
or zone 1

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Installing the transmitters in explosion-hazard areas of zone 2 or 22,
or in areas not subject to explosion hazards

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Installing the transmitters in non-explosion-hazard areas

. . . . . . . . . . . . . . . . . . . . 10

Installing the measuring unit Dräger Polytron 3000

. . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Fitting the sensor

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Start-up

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Maintenance

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Maintenance intervals

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Unit calibration

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Calibrating the zero point

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Calibrating the sensitivity

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Replacing the sensor

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Fault – Cause – Remedy

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Technical Data

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Order List

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Polytron 3000 measuring units

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

ATEX approval

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

IECEx approval

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

UL approval

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

CSA - Approval

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Declaration of Conformity

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Index

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Drilling templates

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Dräger docking station

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

3

For Your Safety

For Your Safety

Strictly follow the Instructions for Use

Any use of the apparatus requires full understanding and strict observation of
these instructions. The apparatus is only to be used for purposes specified here.

Maintenance

The unit must be inspected and serviced regularly by suitably qualified persons.
Repair and general overhaul of the apparatus may only be carried out by trained serv­ice personnel.
We recommend that a service contract be obtained with DrägerService and that
all repairs also be carried out by them. Only authentic Dräger spare parts may be
used for maintenance.
Observe chapter "Maintenance Intervals".

Use in areas subject to explosion hazards

Equipment and components which are used in explosion-hazard areas and which
have been inspected and approved in accordance with international or European
explosion-protection regulations may be used only under the specified conditions.
The equipment or components may not be modified in any manner. The use of faulty
or incomplete parts is forbidden.
The appropriate regulations must be observed at all times when carrying out repairs
on the equipment or components.
If the transmitter has been installed with a suitable safety barrier, its case may be
opened or the sensor may be changed while the transmitter is operating.

Accessories

Use only accessories shown in the Ordering List.

Liability for proper function or damage

The liability for the proper function of the apparatus is irrevocably transferred to the
owner or operator to the extent that the apparatus is serviced or repaired by person­nel not employed or authorized by DrägerService or if the apparatus is used in a
manner not conforming to its intended use.
Dräger cannot be held responsible for damage caused by non-compliance with the
recommendations given above. The warranty and liability provisions of the terms of
sale and delivery of Dräger are likewise not modified by the recommendations given
above.

Dräger Safety AG & Co. KGaA

Caution:
— When the transmitter is installed in Ex areas zone 22 or Class II, Div. 1 & 2,

Group E, F, G the opening of the housing (inclusive sensor replacement)
must not be done when connected to power (power must be turned off or
the area has to be declassified). Explosion hazard!

Intended Use

4

Intended Use

Notes on use in zone 22:

Valid for all Dräger Polytron 3000 versions (see II 3D identification marking on the identification tag) and the accessories Duct
Mount Kit (Order No. 8317150).

Identification marking and safety data concerning dust explosion protection:

0158

II 3D, IP6x T65

o

C (–40

o

C Ta +65

o

C)

Maximum supply voltage: 30 V DC

As electrical equipment of the device class and category II 3D according to directive 94/9/EC, the transmitter Dräger Polytron
3000 can be installed and operated without safety barriers in the ATEX Zone 22 (dust), if the following notes concerning safe
use are taken into account.

1. The category II 3D is only valid for the accordingly marked Dräger Polytron 3000 transmitter.

2. According to EN 50281-1-2, the transmitter may not be installed in areas which are endangered by conductive, combustible
dusts.

3. The Transmitter and the accessories must be enclosed according to IP 6x rating. Especially the locking screw (2 mm Allen
screw) of the sensor bayonet ring tight enough to ensure that the bayonet ring is secured against unintended loosening.

4. The Dräger Polytron 3000 transmitter and the accessories have a maximum surface temperature of 65

o

C and the IP 6x rating.
The transmitter must be installed and maintained according to valid regulations (e.g. in European countries according to EN
50281-1-2).

5. The transmitter and the accessories may only be opened when off-circuit or outside the Ex area. This must always be observed
when replacing the sensor!

— Calibration by one person even in areas subject to explosion hazards.

— For connection to Dräger central units or to a programmable logic controller (PLC) to warn against physiologically harmful

gas concentrations.

— The optional display on the transmitter indicates the actual gas concentration and makes calibration easier.

False alarms during calibration are avoided by a special maintenance mode with output of a maintenance signal.

_______________

® Polytron is a registered trademark of Dräger.

DrägerSensor is a registered trademark of Dräger.

Dräger Polytron

®

3000 Transmitter for electrochemical sensors

— For stationary, continuous monitoring of gas concentrations in ambient air, with

built-in DrägerSensor

®

.

— For indoor and outdoor use

— For installation alternatively in Ex areas zone 0, 1, 2 or 22 corresponding to device

category 1G, 2G, 3G, 3D or Class I, Class II, Div. 1 & 2 hazardous area.
For further details, see the installation notes.

ST–691–2002–1.eps

5

Design

Design

Polytron 3000 is designed for connection to the Dräger Polytron, Regard,
QuadGard or Unigard central units.

The Polytron 3000 transmitter may also be connected to other central units if the fol­lowing conditions are met:

— Industrial standard 4 to 20 mA input signal
— Operating voltage at the transmitter 12 to 30 V DC.

On delivery, Polytron 3000 is configured for the measuring range and gas to be
measured. This information can be found on a sticker below the service port and on
the back of the measuring unit. The Order No. of the sensor to be used is also spec­ified there.

Two different versions of the Polytron 3000 transmitter are available:

Polytron 3000 transmitter with display

This version is intended for installations requiring local indication of the measured
value.
The transmitter is calibrated with the aid of two potentiometers and the display.

Polytron 3000 transmitter without display

This version is intended for installations in which local indication of the measured
value is not required.
A digital voltmeter is required for calibration.

ST–691–2002–1.eps

ST–691–2002–2.eps

Installing the transmitter

6

Installing the transmitter

Preparing for installation

The performance and effectiveness of the entire system depends essentially on the
position chosen for installing the transmitter.
The following should be noted during installation:

— Local requirements and regulations governing the installation of gas measuring

systems.

— Relevant regulations concerning the connection and routing of electric power

supply and signal lines.

— The full scope of environmental factors to which the transmitter may be exposed

(ambient conditions: see Technical data, page 20).

— Physical properties of the gas to be measured:

For gases with a density lower than that of air, the transmitter must be located
above any possible leak or at the highest point at which large concentrations of
gas may occur.
For gases and vapours with a density greater than that of air, the transmitter must
be located below a possible leak or at the lowest point at which such gases and
vapours may occur.

— The specific uses (e.g. possible leaks, ventilation conditions, etc.).
— Accessibility for the necessary maintenance work (see Installation instructions for

the Polytron docking station).

— All other factors and conditions which could have a negative effect on the instal-

lation and operation of the system (such as vibrations or varying temperatures).

— We recommend installing a reflective shield if the unit is exposed to strong sun-

light.

— The transmitter must be installed vertically (sensor facing downwards).
— The transmitter has been tested with regard to its weather-resistance and may be

installed out of doors. Use of a splash guard is recommended to protect the sen­sor from splashing water, dust and wind.

The Dräger Polytron 3000 transmitter consists of two main components:
— Dräger docking station

This can be pre-installed anywhere and contains the electrical installation compo­nents.

— The measuring unit Dräger Polytron 3000

contains the electronics of the transmitter.

If the measuring unit is not fitted immediately after installing the docking station, the
latter should be covered with the raincover provided (dust and water protection) to
protect against dust and splashing water.

In explosion-hazard areas:
Observe the national regulations concerning electrical equipment in
explosion-hazard areas.

7

Installing the transmitter

Installing the docking station

— If the transmitter is to be installed in a Zone 2 explosion-hazard area, select a lo-

cation with low exposure to mechanical risk.

— Docking station is installed vertically (transmitter with sensor facing down) in an

area with low vibrations and stable temperatures – near the possible leak.

— A space of at least 15 cm (6") must be maintained above the transmitter for instal-

lation of the measuring unit.

— A space of at least 10 cm (4") – preferably 30 cm (12") – must be maintained be-

low the docking station to permit access for maintenance.

●

Unpack the docking station.

1

Remove raincover (protection against dust and splashing water).

2

Remove the 4-pole terminal block (Part No. 83 16 268), keep it in a safe place and
insert it again after completion of the installation work.

●

A drilling template is provided on page 51. The mounting holes are 66 ±4 mm (2.6
± 0.16") apart.

If the measuring unit is not to be mounted at this time:

●

refit the raincover (protection against dust and splashing water).

Attention:
Spacers (e.g. mounting bracket 68 09 772) must be used to prevent any
twisting of the housing when installed on uneven surfaces.

00123758_1.eps

1

00223758_1.eps

2

Installing the transmitter

8

How to install the electrical connections

— The electrical wiring may be laid and connected only by a qualified electrician,

who must also comply with the appropriate regulations – a screened or un­screened cable (such as LiY, LiYCY) may be used.

— Connection to central device with at least 2-wire cable, 0.5 to 2.5 mm

2

.

— For currents of 0 to 22 mA, a DC voltage between 12.0 V DC and 30 V DC must

be present at the transmitter.

Installing the 4 to 20 mA current loop on the transmitter

●

Fit 2-wire connecting cable in cable gland, cut to length and strip ends
(approx. 80 mm / 3.15").

●

Shorten the shield (if installed) to prevent short-circuiting:

●

Connect cable

1

2-pin terminal for Polytron 3000 – check polarity (marking in the docking station).
Cut excess wires short or

2

Fasten in 4-pin terminal.

1

Slide connecting terminal back into holder.

●

Secure cable in holder.

●

Fold up the installation notes and place them in the Dräger docking station for fu­ture use during commissioning.

●

Refit raincover (protection against dust and splashing water).

Connecting to the central unit

●

Connect shield to earth of central unit (e.g. housing, earth bar, etc.).

Connecting the Dräger Polytron 3000 transmitter to a Dräger control unit
(such as Regard, QuadGard, Unigard or Polytron):

— Further information about the connection can be found in the instructions for

the Dräger control unit.

Connecting the Dräger Polytron 3000 transmitter to control units with
a 4 to 20 mA interfaced made by other manufacturers:

— For operation together with control units made by other manufacturers, care must

be taken that the voltage at the transmitter does not drop below 12 V. The supply
voltage, the resistance of the cable and the load and the resistance of any in­stalled safety barrier must be taken into account.

— Further information about the connection can be found in the instructions for the

control unit being used.

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1

2

9

Installing the transmitter

Installing the transmitter in areas subject to explosion hazards of zone 0 or
zone 1

●

Install a safety barrier with the appropriate explosion protection approval (catego­ry 1, 2 or Div. 1) between the transmitter and the control unit.

— Only safety barriers with the following characteristics may be used: U

o

(V

oc

) ≤

30

V, I

o

(Isc) ≤ 0.3 A, P

o

≤

700 mW.

— Take care that the maximum permissible capacitance and inductance of connec-

tions to the safety barrier are not exceeded, also taking the cable into account.
The safety-related input parameters of the transmitter are: C

i

= 0 nF, Li = 50 μH.

Transmitter supply units

(without HART-communication between Ex/Non-Ex area)
The following safety barriers are provided as examples only. Selected barriers must
be acceptable to the authority having jurisdiction and comply with the assigned P3S
entity parameters also taking the cable into account.

— Connect shielding to earth point and/or 0 V (Ex i).

Installing the transmitters in explosion-hazard areas of zone 2 or 22, or in areas
not subject to explosion hazards

— Use only supply units of the device category 3.
— Take care that the maximum permissible capacitance and inductance of connec-

tions to the supply unit are not exceeded, also taking the cable into account.
The safety-related input parameters of the transmitter are:
C

i

= 0 nF, Li = 50 μH.

Manufacturer Type suitable for Line (Loop)

MTL MTL 5041 Zone 0, Div. 1

≤

190 Ω

Pepperl & Fuchs KFD2–STC4–Ex1 Zone 0, Div. 1

≤

140 Ω

KFD2–STC1–Ex1 Zone 0, Div. 1

≤

140 Ω

Steel

1)

1)

Only use the steel safety barrier as of a cable length of 100 m.

9160 / 13 – 11 – 11 Zone 0

≤

220 Ω

Caution:
The category 1 marking has to be cut out from the rating-plate label. Once
the unit has been used after installation in the above manner, it may never
be installed in explosion-hazard areas of zone 0 or zone 1 (device category
1 or 2). Explosion hazard!

00433020_1_en.eps

Non-explosion-hazard areaExplosion-hazard area, zone 0, 1 or Div. 1

Safety barrier

Control unit

Ex i

PA

Earth point

4 ... 20 mA

0 V

+

–

+

4 to 20 mA

+24 V

Installing the transmitter

10

Installing the transmitters in non-explosion-hazard areas

Installing the measuring unit Dräger Polytron 3000

● Remove the rain cover from the previously installed docking station.

● Examine seal for signs of dirt and clean if necessary.

1 Check position of eccentric catches and correct if necessary.

The eccentric opening must point upwards, engaged position.

● Check the polarity (marking in the docking station) and cable routing and check

that the connector is securely seated; rectify as necessary (see the installation
notes for the Polytron docking station).

● Unpack the measuring unit Dräger Polytron 3000.

2 Insert the measuring unit about halfway up the docking station and slide it in as

far as it will go.

3 Lower the unit along the front edge of the docking station. About 5 mm before its

hits the stop, the resistance will increase as the connector engages with the sock­et on the printed circuit board.

1 Turn the eccentric catches clockwise with an Allen key to lock the measuring unit

(

⇒ = approx. 180

o

).

Caution:
The explosion-protection markings has to be removed from the transmitter. Once the transmitter has been used after
installation in this manner, it may never be installed in explosion-hazard areas.

Attention:
Use only a 5 mm Allen key without a ball head.

Note!
Check that the terminals in the docking station are correctly aligned if the
connector does not engage correctly!

Note:
Ensure that the front bottom of the measuring unit is flush with the bottom
of the Docking Station. Apply pressure to the measuring unit until it
"clicks" into place. If the fronts are not flush, the measuring unit is not
completely sealed and could get water inside the transmitter!

00533020_1_en.eps

Non-explosion-hazard area

Control unit

4 ... 20 mA

0 V

+

–

+

4 to 20 mA

+24 V

Ex-hazard area, zone 2 or non explosion-hazard area

00623758_1.eps

2

3

1

11

Installing the transmitter

Fitting the sensor

1 Remove bayonet ring from transmitter, remove dummy plate.
2 Open the front cover of the service port with an Allen key by turning anticlockwise

(approx. 60

o

).

3 Only use the DrägerSensor specified on the sticker on the Polytron 3000 meas-

uring unit.

● Remove sensor from packaging.

● Remove short-circuit jumper from sensor if installed.

● There is a coded connector on the back of the sensor. Place the sensor in the

opening with the connector at the back and the Dräger logo at the front.
Before plugging the connector in the socket, ensure that they are identically cod­ed. Incorrect connection can damage the sensor!

● Secure sensor in transmitter with bayonet ring.

If the manufacturer's calibration setting for the sensor is to be used:

● Open the front cover of the service port with an Allen key by turning anticlockwise

(approx. 60

o

). The maintenance switches and potentiometers for calibration are

now revealed.

4 Jumper J1 must be set over the two left-hand pins or removed completely.

If the transmitter is specifically to be calibrated with calibration gas:

● Open the front cover of the service port with an Allen key by turning anticlockwise

(approx. 60

o

). The maintenance switches and potentiometers for calibration are

now revealed.

5 Jumper J1 must be set over the two right-hand pins.

Attention:
Use only a 5 mm Allen key without a ball head.

Attention:
For use in Zone 22, tighten the locking screw (2 mm Allen screw) of the
sensor bayonet ring tight enough to ensure that the bayonet ring is
secured against unintended loosening.

00723758_1.eps

1

Polytron

2

00823758_1.eps

Polytron

4
5

3

Start-up

12

Start-up

● Switch on power supply.

The transmitter begins its warm-up routine.This is indicated by a flashing display.
The warm-up phase takes between 5 minutes and 12 hours, depending on the
sensor installed. Note the information in the sensor data sheet. The warm-up
phase may take longer in extremely high or low temperatures. It is completed
when the display stops flashing.

When the sensor has warmed up:

— Transmitters set for specific calibration with calibration gas

● Calibrate sensor, page 14.

— Transmitters set for use of the manufacturer's calibration setting for the sensor

● Transmitter is ready for use.

● Check signal transmission to the central unit and alarm output.

Analogue signal

— A current between 4 and 20 mA flows through the transmitter during normal op-

eration. This current is proportional to the gas concentration.

— Polytron 3000 uses various current values to indicate the operating status of the

transmitter:

Display (optional)

Current Meaning

4 mA Zero point

20 mA Full-scale value

<3.2 mA Transmitter fault

3.8 mA ... 4 mA Sensor drift below zero point

20 mA ... 20.5 mA Full-scale value exceeded

3.4 mA ±0.2 mA
constant

Maintenance signal

— In measuring mode, the display shows the actual gas concentration, e.g.:

— The following symbols may be displayed during measurement:

— If a fault has been detected:

— If the measuring range has been exceeded:

— If the zero point is too low (sensor drift below the zero point):

00923758_1.eps

01023758_1.eps

01123758_1.eps

01223758_1.eps

13

Maintenance

Maintenance

Maintenance intervals

Before starting operation:

● Check the calibration, see page 14.

● Check the transmission of signals to the control unit and the triggering of alarms.

At regular intervals,

to be defined by the person responsible for the gas warning installation:

● Check the transmission of signals to the control unit and the triggering of alarms.

If a selective filter specific to the sensor is being used:

● Replace the selective filter –

See the related operating instructions for the sensor for details of the capacity
of the selective filter being used.

At regular intervals defined in accordance with the sensor being used by the
person responsible for the gas warning system:

● Calibrate the sensor, see page 14.

The interval for regular calibration depends on the sensor being used and on the
operating conditions.
Specific calibration data for the sensor, see the operating instructions for the sen­sor.

Every six months:

● Inspection by specialists.

The inspection intervals must be established in each individual case and short­ened if necessary, depending on technical safety considerations, engineering
conditions and the technical requirements of the equipment.
We recommend that a service agreement be concluded with DrägerService
and that repairs also be carried out by them.

As required:

● Replace sensor, page 17.

Maintenance

14

Unit calibration

— Ensure that the sensor is warmed up before it is calibrated. See the sensor data

sheet for the warming-up time.

— Only the zero point is checked if an oxygen sensor has been fitted. The zero point

of an oxygen sensor does not require calibration.

— The transmitter can be calibrated by the operator on site.

— For critical applications, the calibration intervals should be defined in accord-

ance with the recommendations in EN 50073

1)

, EN45544-42) and national regu-

lations.

Note the calibration sequence!

● First check the zero point and correct it necessary, Immediately after this, check

the sensitivity and adjust it as necessary.

— Never calibrate the sensitivity before calibrating the zero point.

— Zero gas and test gas: see the information in the sensor data sheet.

● Open the front cover of the service port with an Allen key by turning anticlockwise

(approx. 60

o

). The maintenance switch and potentiometers for calibration are now

revealed.

Measuring / maintenance mode
1 Maintenance switch with two positions.
2 Measuring mode position (left-hand position) – measured values are relayed to

the analogue output.

3 Maintenance mode position (right-hand position) – a maintenance signal (3.4 mA

±0.2 mA constant) is relayed to the analogue output and prevents alarms being
triggered.

Caution:
— When the transmitter is installed in Ex areas zone 22 or Class II, Div. 1 & 2,

Group E, F, G the opening of the housing (required for calibration) must not
be done when connected to power (power must be turned off or the area
has to be declassified). Explosion hazard!

1)

EN 50073 – Guidelines for selection, installation, use and maintenance of devices for the
detection and measurement of flammable gases and oxygen.

2)

EN 45544-4 – Electrical devices for the direct detection and direct concentration measure­ment of toxic gases and vapours – Part 4: Guidelines for selection, installation, use and
maintenance.

Caution:
Test gas must not be inhaled. Risk to health! Care must be taken about the

risks which can arise when using test gas; hazard instructions and safety advice
must be observed.
For details, see appropriate DIN Safety Data Sheets.

Attention!
Use only a 5 mm Allen key without a ball head.

Note:
The Dräger Polytron 3000 does not support the storage of calibration data
in the sensor data base.

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Polytron

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2
3

1

15

Maintenance

Output for calibration
4 Connect voltmeter (mV setting, Ri > 10 M) to test points TP1 and TP2 (required

for the version without display).

— If a fault is detected, the voltmeter shows –200 mV.
— Voltage output –200 to 1100 mV:

–200 mV corresponds to a fault
–0 mV corresponds to zero concentration
–1000 mV corresponds to the 100 % measuring range end value

Jumper
5 Jumper J1 can be set to two positions.
6 The left-hand position or complete removal of jumper J1 in order to use the man-

ufacturer's calibration setting for the sensor.

7 The right-hand position for calibration with calibration gas and the potentiometers

for zero point and sensitivity.

— Only the manufacturer's calibration setting for the sensor can be used when jump-

er J1 is set over the two left-hand pins.

— Calibration with calibration gas can be performed when jumper J1 has been set

over the two right-hand pins.

Operating elements
8 Potentiometer (left) for calibration of the zero point.
9 Potentiometer (right) for calibration of the sensitivity.

Caution:

— For operation in explosion-hazard areas:

Only use intrinsically safe voltmeters with electrical parameters to the fol­lowing specifications:
U

i (Vmax

) 7.6 V; Ii (I

max

) 1 mA; Uo (Voc) 10.4 V; Ci 2.5 μF; Li 10 mH (Co (Ca)

and L

o

(La) are not relevant as Ci and Li of the test point circuit are zero)

MiniGrabber© Test Clips from Pomona Electronics (order no. 4723 or

4826) shall be used for connecting the voltmeter.
The jumper J1 must be connected to the right-hand pin, when connecting
the voltmeter.

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–

TP1

TP2

4

mV

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7

J1

5

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Maintenance

16

Calibrating the zero point

For all sensors except oxygen sensor:
The zero point can be calibrated without the use of nitrogen (zero gas) when the
ambient air is free from measuring gas and other interfering gases. Alternatively:

1 Use the calibration adapter.

● Set maintenance switch to maintenance position, see page 14.

● Let nitrogen flow through the calibration adapter at a rate of approx. 0.5 L/min.

Synthetic air may also be used, except when calibrating oxygen sensors.

● Wait for the measured value to stabilise – approx. 3 minutes. Note the information

in the sensor data sheet.

2 Set potentiometer for zero point so that the display shows 0 and the digital volt-

meter 0 mV ±2 mV.

Oxygen sensors:
The zero point cannot be calibrated for these sensors. The zero point is merely
checked.

● Switch off calibration gas and remove calibration adapter.

● Set maintenance switch to measuring position, see page 14.

Calibrating the sensitivity

— The recommended calibration gas concentration for optimum accuracy is be-

tween 40 % and 100 % of the measuring range end value.

1 Use the calibration adapter.

● Set maintenance switch to maintenance position, see page 14.

● Let calibration gas flow through the calibration adapter at a rate of approx. 0.5 L/

min.

— Wait for the measured value to stabilise – approx. 3 minutes. Note the information

in the sensor data sheet.

3 Set the potentiometer for sensitivity so that the display shows the concentration

of the calibration gas or the digital voltmeter shows the calculated voltage mV.
Calculation of the voltage V

exp

between test points TP1 and TP2:

V

exp

= Concentration of calibration gas ÷ Measuring range x 1000 mV

Caution:
Test gas must not be inhaled. Risk to health!
Care must be taken about the risks which can arise when using test gas;
hazard instructions and safety advice must be observed.
For details, see appropriate Safety Data Sheets.

Example: Concentration of calibration gas 250 ppm CO

Measuring range 0 to 300 ppm CO

Calculated voltage: 250 ppm

V

exp

=

x 1000 mV = 833 mV

300 ppm

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