Dräger Sensor User Manual

Catalytic Bead DrägerSensor®
Sensors for Fixed Gas Detectors

The DrägerSensor® ... DQ detects  ammable gases and vapours such as

hydrogen. Due to the double-detector compensation method, the catalytic

sensor is particularly long-term stable. The wire mesh at the gas inlet

serves as a  ame barrier. So it ensures explosion protection at the same

time short response time.

Reference chamber with reference pellistorMeasuring pellistor

Flameproof stainless steel housing

Flame barrier

D-10088-2018

02 | Catalytic Bead DrägerSensor®

Benets

The catalytic bead principle

The DrägerSensors ... DQ are based on the catalytic bead detection principle. The most important component

are the hot, catalytically active pearls on platinum coils (pellistors). These pellistors burn the gas and additional

heat of reaction is created. The temperature increases depending on the gas concentration and thus also

changes the electrical resistance of the platinum coils. This change is passed on as a measuring signal. There

are ve different catalytic bead sensors from Dräger, which are used in different transmitters and measuring

heads.

DrägerSensor® PR M DQ

PR stands for poison resistant. The pellistors of the DrägerSensor PR M DQ have a longer service life under
the inuence of poisonous substances. The sensor has a metric thread (M) on the back.

DrägerSensor® PR NPT DQ

The DrägerSensor PR NPT DQ also withstands poisoning substances for a long time. This sensor is equipped

with a NPT thread on the back.

DrägerSensor® HT M DQ

The DrägerSensor HT M DQ can be used at ambient temperatures of up to 150 ° C and is also approved
accordingly (HT = high temperature). This sensor also has a metric thread.

DrägerSensor® LC M

LC stands for >low concentration<. The DrägerSensor LC M detects very low gas concentrations in the

measuring range from 0 to 10% LEL. This is possible by a special arrangement of the PR pellistors, as well as

an amplier electronics. The sensor has a metric thread.

DrägerSensor® LC NPT

The LC NPT sensor also detects gas concentrations in the measuring range of 0 to 10% LEL. It is equipped

with a NPT thread.

System Components

D-13692-2010

Catalytic Bead DrägerSensor® | 03

Dräger Polytron® SE Ex

The Dräger Polytron® SE Ex ... DQ sensing heads are gas detectors for

the continuous monitoring of ammable gases and vapours in the

ambient air. Measurement is based on the heat of reaction principle

where a chemical reaction takes place in a catalytic bead (also known
as a pellistor) inside the sensor.

Dräger PEX 3000

D-11158-2011

D-32407-2011

The transmitter Dräger PEX 3000 detects ammable gases and vapours

in concentrations below their lower explosive limit. Its DQ-sensor
provides a long-term stable measuring signal and responds to gas

within a few seconds.

Dräger Polytron® 5200 CAT

The Dräger Polytron® 5200 CAT is a cost-effective explosion-proof
transmitter for the detection of ammable gases in the lower explosion
limit (LEL). It uses a catalytic bead DrägerSensor® Ex … DQ that will
detect most ammable gases and vapours. A 3-wire 4 to 20 mA
analogue output with relays makes it compatible with most control

systems.

Dräger Polytron® 8200 CAT

The Dräger Polytron® 8200 CAT is an advanced explosion-proof
transmitter for the detection of ammable gases in the lower explosion

®

limit (LEL). It uses a catalytic bead DrägerSensor

Ex … DQ that will

detect most ammable gases and vapours. In addition to a 3-wire 4 to

20-mA analogue output with relays it also offers Modbus and Fieldbus

protocols, making it compatible with most control systems.

D-15042-2010

04 | Catalytic Bead DrägerSensor®

System Components

D-11951-2016

Dräger PointGard 2200

The Dräger PointGard 2200 series is a self-contained gas detection

system for the continuous area monitoring of ammable gases and
vapours in ambient air. PointGard 2200’s rugged, water-resistant

housing comes complete with a horn and strobes, a built-in power

supply, and reliable DrägerSensor®.

Related Products

ST-8821-2005

DrägerSensor IR

Upgrade from catalytic bead to infrared technology with ease using the

DrägerSensor IR. The Sensor IR can replace catalytic ex-sensors
(pellistors) from the majority of manufacturers without replacing
controllers, cables, junction boxes or control systems.

Technical Data

DrägerSensor® PR M DQ, PR NPT DQ, HT M DQ

Catalytic Bead DrägerSensor® | 05

Environmental conditions Temperature (PR M/NPT DQ)

Temperature (HT M DQ)

Pressure

Relative humidity

Storage Temperature

Pressure

Relative humidity

Gas or vapour CAS-No. LEL in Vol.-% Typical sensitivity

in mV/% LEL

Relative

sensitivity based

-50 to +85 °C

-50 to +150 °C

800 to 1.200 hPa

5 to 95 % r. h.

-40 to +65 °C

70 to 1.300 hPa

10 to 90 % r. h.

Response time

t50 in s

1

Response time

t90 in s

on propane

Acetone

Acetylene

Ammonia

Petrol 065/095
Benzene

67-64-1 2.5 0.8 1.1 ≤ 12 ≤ 24
74-86-2 2.3 0.9 1.3 ≤ 12 ≤ 21
7664-41-7 15.0 1.4 2.0 ≤ 10 ≤ 17

---

1.1 0.6 0.9 ≤ 12 ≤ 24

71-43-2 1.2 0.6 0.9 ≤ 14 ≤ 28

1,3-Butadiene 106-99-0 1.4 0.7 1.0 ≤ 12 ≤ 22

n-Butane

n-butyl acetate

Diethyl ether

Dimethyl ether

Acetic acid

Ethyl alcohol

Ethyl acetate

Ethylene (Ethene)
Ethylene oxide
n-hexane

Methane

Methanol

Methyl ethyl

106-97-8 1.4 0.7 1.0 ≤ 13 ≤ 26
123-86-4 1.2 0.5 0.7 ≤ 14 ≤ 33
60-29-7 1.7 0.7 0.9 ≤ 15 ≤ 30
115-10-6 2.7 0.8 1.1 ≤ 12 ≤ 23
64-19-7 4.0 0.5 0.7 ≤ 14 ≤ 34
64-17-5 3.1 0.8 1.1 ≤ 13 ≤ 24
141-78-6 2.0 0.6 0.8 ≤ 15 ≤ 30
74-85-1 2.3 0.8 1.1 ≤ 11 ≤ 21
75-21-8 2.6 0.7 1.0 ≤ 11 ≤ 22
110-54-3 1.0 0.5 0.7 ≤ 14 ≤ 29
74-82-8 4.4 1.1 1.6 ≤ 10 ≤ 19
67-56-1 6.0 1.0 1.5 ≤ 11 ≤ 21
78-93-3 1.5 0.6 0.8 ≤ 13 ≤ 27

ketone

Methyl

80-62-6 1.7 0.6 0.9 ≤ 14

≤ 29

methacrylate
n-nonane

n-octane

n-pentane

Propane

i-propanol

Propylene

111-84-2 0.7 0.4 0.6 ≤ 15 ≤ 46
111-65-9 0.8 0.5 0.7 ≤ 15 ≤ 31
109-66-0 1.1 0.6 0.8 ≤ 14 ≤ 33
74-98-6 1.7 0.7 1.0 ≤ 12 ≤ 23
67-63-0 2.0 0.7 0.9 ≤ 13 ≤ 25
115-07-1 2.0 0.8 1.2 ≤ 11 ≤ 21

(Propene)
Propylene oxide

Toluene

Hydrogene

o-xylene

1

Response times according to DIN EN 60079-29-1, Annex B, B.2.1 (with calibration adapter).

75-56-9 1.9 0.7 0.9 ≤ 13 ≤ 25
108-88-3 1.0 0.6 0.8 ≤ 14 ≤ 35
1333-74-0 4.0 1.0 1.5 ≤ 9 ≤ 16
95-47-6 1.0 0.7 0.9 ≤ 14 ≤ 38

1

06 | Catalytic Bead DrägerSensor®

Technical Data

Approvals

DrägerSensor® PR M DQ ATEX

DrägerSensor® PR NPT DQ ATEX

DrägerSensor® HT M DQ ATEX

IECEx

IECEx

UL

IECEx

II 2G Ex db IIC T6...T4 Gb, II 2G Ex tb IIIC T130°C...T195°C Db

IP6x (-50°C ≤ Ta ≤ +40°C/55°C/85°C)

Ex db IIC T6...T4 Gb, Ex tb IIIC T130°C...T195°C Db IP6x (-50°C ≤

Ta ≤ +40°C/55°C/85°C)

II 2G Ex db IIC T6...T4 Gb, II 2G Ex tb IIIC T130°C...T195°C Db

IP6x (-50°C ≤ Ta ≤ +40°C/55°C/85°C)

Ex db IIC T6...T4 Gb, Ex tb IIIC T130°C...195°C Db IP6x (-50°C ≤

Ta ≤ +40°C/55°C/85°C)
Class I, Groups A,B,C,D Class II, Groups E,F,G (-50°C ≤ Ta ≤

+85°C)
II 2G Ex db IIC T3 Gb, II 2GD Ex tb IIIC T195°C Db IP6x (-50°C ≤

Ta ≤ +155°C)
Ex db IIC T3 Gb, Ex tb IIIC T195°C Db IP6x (-50°C ≤ Ta ≤ +155°C)

DrägerSensor® LC M, LC NPT

Environmental conditions Temperature

Pressure

Relative humidity

Storage Temperature

Pressure

Relative humidity

Gas CAS- LEL in Vol.-% Test gas

concentration in

ppm

Methane

Ammonia

Ethene

Propane

Propene

Hydrogene

Approvals

DrägerSensor® LC M ATEX

DrägerSensor® LC NPT ATEX

74-82-8 4.0 2,5 6.0 7.0 6.0

7664-41-7 15.0 6 4.0 9.0 5.0

74-85-1 2.0 1 4.0 5.0 3.0

74-98-6 2.0 1 6.0 4.0 3.0

115-07-1 2.0 700 4.0 5.0 2.0

1333-74-0 4.0 2 5.0 6.0 4.0

IECEx

IECEx

Test gas

concentration in

% LEL

-40 to +85 °C

900 to 1100 hPa

5 bis 95 % r. h.

-40 to +65 °C

70 to 1300 hPa

10 to 90 % r. h.

Sensitivity in mV

/ % LEL

II 2G Ex db eb IIC T6...T4, II 2D Ex tb IIIC

T80...130°C Db IP6x (-40°C ≤ Ta ≤

+40/50/85°C)
Ex db eb IIC T6...T4, Ex tb IIIC T80...130°C

Db IP6x (-40°C ≤ Ta ≤ +40/50/85°C)
II 2G Ex db IIC T6...T4, II 2D Ex tb IIIC

T80...130°C Db IP6x (-40°C ≤ Ta ≤

+40/50/85°C)
Ex db IIC T6...T4, Ex tb IIIC T80...130°C Db

IP6x (-40°C ≤ Ta ≤ +40/50/85°C)

Reading of a

methane-

calibrated

instrument in %

LEL

Ordering Information

Catalytic bead DrägerSensor®

DrägerSensor® PR M DQ

DrägerSensor® HT M DQ

DrägerSensor® PR NPT DQ

DrägerSensor® LC M

DrägerSensor® LC NPT

Catalytic Bead DrägerSensor® | 07

68 14 140

68 14 145

68 14 150

68 10 350

68 10 675

Calibration / adjustment accessories

Test gas cylinder methane apprx. 40 %LEL, 150 bar
Pressure reducer on request

Calibration adapter for PR M DQ, HT M DQ and PR NPT DQ

Remote calibration adapter for PR M DQ, HT M DQ and PR NPT DQ

1

1

Process adapter for PR M DQ, HT M DQ and PR NPT DQDQ

Calibration adapter for LC M and LC NPT

1

metrologically tested according to EN 60079-29-1 (in connection with the respective measuring heads or transmitters)

on request

68 06 978

68 12 480

68 12 470

68 06 978

08 | Catalytic Bead DrägerSensor®

Notes

Not all products, features, or services are for sale in all countries.
Mentioned Trademarks are only registered in certain countries and not necessarily in the country
in which this material is released. Go to www.draeger.com/trademarks to nd the current status.

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90 45 523 | 21.02-3 | HQ | PP | Subject to modications | © 2021 Drägerwerk AG & Co. KGaA