MSA 47K Series User manual

Operating Manual
Series 47K
Gas Detector (SIL 2)
Order No.: 10052472/16
MSAsafety.com

© MSA 2022, 2021. All rights reserved
WARNING!
These instructions must be provided to users before use of the product and retained for ready reference by the user.
Read this manual carefully before using or maintaining the device. The device will perform as designed only if it is used
and maintained in accordance with the manufacturer's instructions. Otherwise, it could fail to perform as designed, and
persons who rely on this device could sustain serious injury or death.
The warranties made by MSA with respect to the product are voided if the product is not installed and used in
accordance with the instructions in this manual. Please protect yourself and your employees by following the
instructions.
Please read and observe the WARNINGS and CAUTIONS inside. For additional information relative to use or repair,
call 1-800-MSA-2222 during regular working hours.
For countries of Russian Federation, Republic of Kazakhstan and Republic of Belarus, the gas detector will be delivered
with a passport document that includes valid approval information. On the CD with manual instruction attached to the
gas detector the user will find the documents "Type Description" and "Test Method" - appendixes to Pattern Approval
Certificate of Measuring instrument, valid in the countries of use.
The Declaration of Conformity can be found under the following link: https://MSAsafety.com/DoC.
MSA is a registered trademark of MSA Technology, LLC in the US, Europe and other Countries. For all other trademarks
visit https://us.msasafety.com/Trademarks.
MSA Europe GmbH
Schlüsselstrasse 12
8645 Rapperswil-Jona
Switzerland
For your local MSA contacts, please go to our website www.MSAsafety.com

Contents
1 Safety Regulations 5
1.1 Correct Use 5
1.2 Liability Information 5
1.3 Application, Advice, and Restrictions 5
2 Description 7
2.1 General 7
2.2 Principle of Operation 7
2.3 Technical Specification 8
3 Installation 10
3.1 Installation-Step by Step 10
3.2 Unpacking 10
3.3 General Installation Instructions 10
3.4 Recommended Torque and Terminal Sizes 11
3.5 Electrical Connection to the Control Unit 11
3.5.1 Junction Box Terminals 11
3.5.2 Maximum Cable Length 11
3.6 Electrical Connections 12
4 Start up 13
5 Maintenance and Service 14
5.1 Calibration 14
5.1.1 Zero Calibration 14
5.1.2 Span Calibration 14
5.1.3 Calibration with Accessories 15
5.2 Sensor Replacement 15
5.3 Series 47K-PRP and Series 47K-HT-PRP 15
5.3.1 47K-HT-PRP 16
5.3.2 47K-PRP 16
6 Accessories 18
6.1 Calibration Cap 18
6.2 Weather Protection Cap 18
6.3 Flow Through Adapter/ Pump Adapter 19
6.4 Duct Mount Flange 19
6.5 Pipe Mounting Kit 20
6.5.1 Mounting Kit for Pipes with a Diameter of up to 50 mm 20
6.5.2 Mounting Kit for Pipes with a Diameter from 50 mm up to 150 mm 21
6.6 Remote Calibration Adapter (CalGard) 21
6.6.1 Installation 22
6.6.2 Operation 22
7 Markings, Certificates, and Approvals 24
7.1 According to the Directive 2014/34/EU [ATEX] 24
7.1.1 Series 47K PRP, Series 47K-HT-PRP 24
7.1.2 Junction Box Typ S47K and X Series AL Junction Box 25
7.2 According to IECEx 26
7.3 Special Conditions for SIL 2 According to TUV Certificate 968 / EZ 392.00/09 26
8 Ordering Information 28
3 Series 47K GB

8.1 Gas Detector (Sensor+Junction Box) 28
8.2 Gas Detector, Calibrated with Certified MSA Gas Controllers 28
8.3 Sensor 28
8.4 Junction Box 28
8.5 Accessories 28
9 Dimensions 30
9.1 Gas Detector (EX e Junction Box) 30
9.2 Gas Detector (Ex d Junction Box) 31
9.3 S47K Adapter Plate Junction Box 32
9.4 Wall Mounted Bracket Sensor 47K-HT-PRP 32
9.5 Junction Box ATEX 100 °C; Sensor 47K-HT-PRP 33
9.6 Pipe Mounting Kit 34
9.6.1 Mounting Kit for Pipes with a Diameter of up to 50 mm 34
9.6.2 Mounting Kit for Pipes with a Diameter from 50mm to 150mm 35
9.7 Remote Calibration Adapter 35
10 Wiring Diagrams 36
10.1 MSA Control Unit SUPREMA 36
10.1.1 Series 47K-PRP/ -HT-PRP [3-wire] 36
10.1.2 Series 47K-PRP/ -HT-PRP [5 wire] 37
10.2 MSA Control Unit 9010/ 9020 Series 37
10.2.1 Series 47K-PRP/ -HT-PRP [3-wire] Channel A 37
10.2.2 Series 47K-PRP/ -HT-PRP [3-wire] Channel B 38
10.3 MSA Control Unit Gasgard XL 38
10.3.1 Series 47K-PRP [3-wire] 38
10.3.2 Series 47K-HT-PRP 39
10.4 Wiring Diagram Sensor 47K-HT-PRP with Junction Box ATEX 100 °C 39
GB Series 47K 4

1 Safety Regulations
1.1 Correct Use
The MSA Gas Detector Series 47K is designed to continuously monitor the atmosphere for the presence of potentially
explosive gas or vapour in air in the range 0 to 100% LEL.
It is designed for use as an integral part of an MSA fixed gas detection system for the protection of industrial plant and
workers.
It is imperative that this operating manual be read and observed when using the system. In particular, the safety
instructions, as well as the information for the use and operation of the apparatus, must be carefully read and observed.
Furthermore, the national regulations applicable in the user's country must be taken into account for a safe use.
DANGER!
This product is supporting life and health. Inappropriate use, maintenance or servicing may affect the function of the
device and thereby seriously compromise the user’s life.
Before use, the product operability must be verified. The product must not be used if the function test is unsuccessful, it
is damaged, a competent servicing/ maintenance has not been made, genuine MSA spare parts have not been used.
Failure to follow this warning will result in serious personal injury or death.
Alternative use, or use outside this specification will be considered as non-compliance. This also applies especially to
unauthorised alterations to the apparatus and to commissioning work that has not been carried out by MSA or
authorised persons.
1.2 Liability Information
MSA accepts no liability in cases where the product has been used inappropriately or not as intended. The selection and
use of the product are the exclusive responsibility of the individual operator.
Product liability claims, warranties also as guarantees made by MSA with respect to the product are voided, if it is not
used, serviced or maintained in accordance with the instructions in this manual.
1.3 Application, Advice, and Restrictions
This Manual should be carefully read by those responsible for use and maintenance of the gas detection and monitoring
system.
• The series 47K catalytic sensor is suitable for the detection of gases or vapours in air with a concentration below
the Lower Explosive Limit [LEL].
• The series 47K catalytic sensor cannot measure concentrations of gases or vapours in inert atmospheres or
oxygen deficient atmospheres. The European standard EN 60079-29-2 indicates an Oxygen concentration higher
than 10 vol% is necessary for correct operation of catalytic sensors.
WARNING!
The certification does not permit use of the series 47K sensor in oxygen enriched atmospheres.
Failure to follow this warning can result in serious personal injury or death.
• The series 47K catalytic sensors can be poisoned by high levels or long exposure to certain substances present in
the atmosphere being monitored. When a catalytic sensor is installed in a place where those substances may be
present, to ensure the correct operation and measurement accuracy the sensor should be calibrated more
frequently.
• The sensitivity of the series 47K catalytic sensors is reduced by the presence of silanes, silicates, silicones,
tetraethyl lead, halogen compounds, sulfurous compounds, organic-phosphorous compounds and compounds
5 Series 47K GB
1 Safety Regulations

containing: fluorine, chlorine, iodine or bromine, therefore the sensors must be recalibrated after exposure to
these substances.
• The series 47K sensor opening [sintered disc] must be protected against water, dust and mechanical damage.
During painting operations in the area where the sensor is installed, avoid traces of paint on the sensor opening.
The paint must not interfere with the diffusion process.
• Note that the sensor opening [sintered disc] must always face downwards.
• After exposure of gas above the measuring range, the sensor has to be immediately calibrated / adjusted,
independent of the calibration interval. In the case of an adjustment the zero point and sensitivity of the sensor has
to be rechecked again after 24 hours.
WARNING!
Exposure to polar solvents may reduce the catalytic combustible gas sensors response to hydrogen and hydrocarbons
resulting in erroneously low readings for hydrogen and hydrocarbons. Calibration of the sensors with a surrogate gas
will not detect the reduction in response.
Customers using the catalytic combustible gas sensors to detect hydrogen and hydrocarbons in an environment that
may contain polar solvents must:
• Calibrate their sensors with the target gas. Do not use a surrogate gas for calibration.
• After exposure to polar solvents, the sensor must be recalibrated using the target gas, independent of the
calibration interval, and a gas/ function check shall be performed 24 hours after calibration to verify sensor
response and accuracy.
Failure to follow these warnings can result in serious personal injury or death.
The only method of verifying the correct operation of the sensor is to carry out a span check using a known
concentration of calibration gas in air.
For response curves contact your national MSA office.
GB Series 47K 6
1 Safety Regulations

2 Description
2.1 General
The MSA Gas Detector Series 47K is designed to continuously monitor the atmosphere for the presence of potentially
explosive gas or vapour in air in the range 0 to 100% LEL.
It is designed for use as an integral part of an MSA fixed gas detection system for the protection of industrial plant and
workers.
• Typical areas where the MSA Series 47K Gas Detector can be used include:
• The chemical and petrochemical industry
• The paint and solvent-processing industry
• The gas-processing industry
• The steel-processing industry
• Municipal areas
• The Production, Warehousing, Distribution, Shipping and processing of gases and vapours
The MSA Series 47K Gas Detector consists of the Series 47K catalytic sensor and the junction box that contains the
terminal board.
There are two versions of the junction box available:
• Flameproof [Ex d] with ¾” NPT cable gland thread
• Increased safety [Ex e] with metric M25 cable gland thread
The following Sensor Versions are available:
• Series 47K-PRP: Poison Resistant Pellistor [100% LEL]
• Series 47K-HT-PRP: High Temperature Poison Resistant Pellistor [100 % UEG]
All versions are available in Stainless Steel 316.
Four accessories are available to allow easy calibration and to adapt the gas detector to various applications:
• Calibration cap
• Flow through adapter
• Duct mount flange
• Weather protection cap with remote calibration capability
2.2 Principle of Operation
The MSA 47K series of sensors operate on the principle of catalytic combustion. The sensing element consists of a pair
of filaments [“pellistors”] connected to a pair of precision resistors to form a Wheatstone bridge.
One of the filaments, the detector, is coated with a catalyst, whilst the other, the compensator is used as a reference to
achieve the best stability.
The gas or vapour diffuses through a porous Stainless Steel sintered disc, which acts as a flashback arrestor. When gas
comes into contact with the surface of the detector filament, it is oxidised. The heat generated by the reaction increases
the temperature of the detector, which results in a change of the detector electrical resistance, and hence an unbalance
of the Wheatstone bridge. The result is an output signal directly proportional to the concentration of the flammable gas or
vapour. The signal is processed by an MSA controller designed to display the gas concentration, actuate alarms and
provide a suitable output signal to activate subordinated external measurement data acquisition systems.
7 Series 47K GB
2 Description

2.3 Technical Specification
The Series 47K combustible gas sensors are designed to meet the rigorous requirements of ATEX Directive
2014/34/EU for fixed gas detection installations.
Sensor
Power consumption 1 Watt, typically
Linear dynamic range Standard & PRP & HT-Sensor: 0–100% LEL
Response time t50 ≤10 sec for propane + methane***
t90 ≤20 sec for propane + methane ***
For other gases or vapours the response time may be longer.
Typical sensitivity
PRP- sensor methane: 12 mV/vol%;
propane: 16 mV/vol%;
HT-PRP- sensor methane: 12 mV/vol%;
propane: 16 mV/vol%;
Operating configuration Wheatstone Bridge circuit
Operating mode Constant current
Sensor current 310 mA for 47K-PRP,
300mA for 47K-HT-PRP
Vmax 10 V
Operating life time 3 Years, in clean air, typically
Storage life time 5 Years, in MSA container, typically
Storage temperature range -20 °C to +40 °C**
Operating temperature range PRP- sensor
Extended range *)
HT-PRP sensor
-25 °C to +55 °C
-40 °C to +55 °C
-40 °C to +160 °C
Operating humidity range 5% to 95% RH non-condensing
Operating pressure range 800–1100 hPa
Ingress Protection IP 6X Sensor *****
IP 6X Junction Box
Air velocity Air velocity 0–6 m/s****
[with duct mount flange: 0.5–20 m/s]
Poison resistance PRP sensor and HT-PRP sensor:
10 ppm HMDS for 40 min.
[max. signal loss 5% of reading]
Dimension Ø 36 x 56 mm
Weight < 230 g
Material St. St. 316
Accessory thread M36 x 1.5 mm
Sensor to junction box ¾” NPT or M25 x 1.5 mm
GB Series 47K 8
2 Description

*) Extended range: The sensor extended temperature range is greater than the maximum specified in EN 60079-29-1. It
is therefore strongly recommended that if used above +55 °C or below -25 °C the sensor is calibrated at the operating
temperature.
**) The storage temperature range is also valid for spare parts and accessories.
***) The response time was tested with an calibration Cap and 1 l/m test gas flow.
****) Tested according to EN 60079-29-1 higher values will maybe results in higher deviations of the gas reading.
*****) IP rating implies not that the Sensor can detect gas under this environmental condition, for details see 3.3.
9 Series 47K GB
2 Description

3 Installation
3.1 Installation-Step by Step
1. Unpack and inspect the device or its components.
2. Check the suitability of the installation site and the cabling requirements.
3. Install the sensors and connect the wiring to the MSA control unit.
4. The installation of the sensor must be performed according to standard EN 60079-14 or according to applicable
national standards.
WARNING!
Follow the installation instructions for hazardous areas!
Failure to follow this warning can result in serious personal injury or death.
5. After installation is complete, perform the start-up procedure as instructed in the relevant MSA controller manual.
3.2 Unpacking
Perform the following steps on receipt of the shipment:
1. Carefully unpack the device or its components, observing all of the instructions printed on or accompanying the
packaging.
2. Also inspect the contents of the delivery to determine if any transport damage has occurred and verify that
everything listed in the shipping papers has been received.
3.3 General Installation Instructions
• For connection to the power supply system a fault-free ground or fault-free equipotential bonding must be
provided.
• An appropriate supply voltage free of feedback to the external source in accordance with the EMC Directives
(2014/30/EU) must be used.
• If the devices are supplied from a direct voltage [dc] source, the supply cable must be screened.
• Screened cable is to be used to connect the sensor signal.
• Screened cable must have at least 80% coverage by the screening.
• Sensor cables must be installed physically separate from power supply cables.
• Screened cables must be installed in one piece. If it should prove necessary to extend a cable by way of a terminal
box, the terminal box must be screened, and the connections in the box must be kept as short as possible.
• Unscreened cables and cables from which the insulation has been stripped must be as short as possible and must
be terminated without loops.
• If additional high-voltage surge protection measures are required an appropriate high-voltage protection filter,
approved by MSA, must be installed in the sensor cable.
• Strict adherence to the specifications and regulations applicable to installation, start-up, operation, and
maintenance is required.
• Follow the installation instructions for hazardous areas.
• The specified environmental conditions must be adhered to.
• Position the height of the MSA Gas detector Series 47K according to the density of gas or vapour to be measured.
• The proper installation location must be chosen to ensure that the sintered disc of the MSA Gas detector Series
47K is kept dry and dust-free.
GB Series 47K 10
3 Installation

• To ensure proper function the Gas detector Series 47K must be kept dry and free of any contaminants, e.g. dust
particles and water. Regular visual checks are recommended. Any contaminants must be removed by blowing
them off with clean, oil-free compressed air or with a dry brush. Ensure that the air entrances are kept free from
any coating, e.g. paint, grease or similar.
• The sintered disc must always face downwards (±15°).
• The MSA Gas detector Series 47K must never be covered with paint, grease or similar.
• These substances prevent diffusion, of the atmosphere to be monitored, to the sensing elements.
3.4 Recommended Torque and Terminal Sizes
Cable gland size Connection thread Pressing screw Terminal sizes
M25 x 1,5 3,0 Nm 2,0 Nm 7–12/10–17* mm
* To be able to use size M25 x 1,5 for terminal sizes 10–17 mm, remove the small sealing ring.
3.5 Electrical Connection to the Control Unit
3.5.1 Junction Box Terminals
Screw terminals: cross section 0,5–2,5 mm2, screw torque 0,55 Nm ± 0,05 Nm
Spring terminal: cross section 0,5–1,5 mm2
3.5.2 Maximum Cable Length
The maximum cable length depends on the maximum permissible load, the cross section of the conductor and the
conductor material.
The maximum permissible load [loop resistance] is 36 ohms for the MSA Control units SUPREMA [for MSA Control unit
9010/9020 refer to the control unit manual].
Maximum cable length:
L = cable length in metres [loop]
R = maximum permissible load in ohms
A = cross sectional area of conductor in mm2
k = conductivity of copper = at 20 °C [1/Resistivity]
Example: R = 36 ohms, A = 0.75 mm2, k = 56 m ohms-1 mm-2
L = 36 x 56 x 0.75/2 = 756 m
Wire Cross Section Maximum Load
[max. cable resistance]
Maximum Length Remarks
0.75 mm2
1.5 mm2
36 Ohm
36 Ohm
750 m
1,500 m
Screened cable is required.
For detailed information refer to the relevant MSA controller manual.
11 Series 47K GB
3 Installation

3.6 Electrical Connections
WARNING!
Installation should only be carried out by suitably qualified personnel.
Failure to follow this warning can result in serious personal injury or death.
• During installation all relevant codes of practice and National wiring regulations should be complied with
especially in places where there is a risk of explosion and fire. [Classified areas]
• Refer to the MSA controller instruction manual for the sensor connection details.
• Where an earth connection to the junction box/ sensor is required use the earth terminal provided on the outside of
the junction box.
The sensor connections are shown in Section 10 Wiring Diagrams.
GB Series 47K 12
3 Installation

4 Start up
WARNING!
Installation should only be carried out by suitably qualified personnel.
Failure to follow this warning can result in serious personal injury or death.
Before applying power ensure that all installation steps have been correctly carried out and the cable connections and
controller configuration are correct.
CAUTION!
Ensure that the sensor current is correctly set to 310 mA for the 47K-PRP and 300 mA for the 47K-HT-PRP.
Failure to follow this caution can result in minor or moderate injury.
Allow a warm-up time of at least 30 minutes before calibrating the gas sensor.
Perform an initial calibration following the instructions in Section 5.1 Calibration and the manual for the relevant MSA
controller.
13 Series 47K GB
4 Start up

5 Maintenance and Service
There are no serviceable or adjustable parts within the sensor assembly and any attempt to dismantle the assembly or
access it will invalidate the sensor approvals and manufacturers guarantee.
Maintenance and service may only be performed by authorised and suitably qualified personnel.
CAUTION!
To guarantee the nonambiguity of the series 47K catalytic sensor operation ensure [e.g. by check with hand-held test
instruments] each time before turning on the sensors that the atmosphere to be monitored by the sensors is free of
combustible gases.
Failure to follow this caution can result in minor or moderate injury.
Maintenance must be performed according to standards EN 60079-17 and EN 60079-29-2 or according to applicable
national standards.
5.1 Calibration
According to EN 60079-29-2 the combustible gas detectors must be checked at regular intervals to ensure that it is
functioning properly in accordance with the applicable international, national, industry-specific or company regulations.
The sensitivity and zero point of the sensor must be adjusted as necessary [every 6 months at the latest] in accordance
with the operating instructions for the type of sensor and controller it is connected to.
In case of high dust or water pollution is expected then the calibration intervals should be shortened.
Sensors that are no longer able to generate the minimum signal must be replaced [see relevant controller manual].
Allow a warm-up time of at least 30 minutes for the sensor to stabilise, before calibration is performed. For calibration a
test gas cylinder can be used.
Calibrating the Gas Detectors 47K-HT-PRP
These gas detectors must be calibrated at their ambient working temperature using the flow through adaptor [please
refer to 5.1.3 Calibration with Accessories].
The specified temperature range of the 47K-HT-PRP gas detectors is -40 °C to +160 °C and the bridge operating current
is 300 mA.
5.1.1 Zero Calibration
• Apply zero gas to the sensor using the appropriate calibration adapter.
• Wait for approximately 2 minutes or until the sensor reading has stabilised.
• Adjust the controller until the correct reading is obtained.
Gas flow rate : 1.0 l/min
Zero gas : synthetic air or component-free ambient air
5.1.2 Span Calibration
See also Section 5.3 .
• Apply span calibration gas to the sensor using the appropriate calibration adapter.
• After the reading has stabilised adjust the controller until the correct reading is obtained.
• Remove calibration adapter.
GB Series 47K 14
5 Maintenance and Service

Gas flow rate : 1.0 l/min
Stabilization time : depending on gas type between 2 and 4 min
CAUTION!
Use span gas with a concentration of approximately 50% of the measuring range. In no case should the span gas
concentration be less than 25% of the full scale value of the measuring range.
If possible, the span gas [the gas used to calibrate the sensor] and the measurement gas [the gas to be monitored]
should be identical. If this is not the case and a reference gas is used, the response factor of the gas used must be
known.
Failure to follow these cautions can result in minor or moderate injury.
5.1.3 Calibration with Accessories
Calibration of Gas detectors used with duct mount flange, flow through adapter or weather protection cap should be
carried out as described above using the particular gas inlets of the accessories.
Gas flow rate : 1.0 l/min
5.2 Sensor Replacement
CAUTION!
In a hazardous area, ensure all necessary precautions are taken before opening the junction box. Replacement of the
sensor or other parts should only be carried out by suitably qualified personnel.
Failure to follow this caution can result in minor or moderate injury.
After checking if it is possible to carry out operation, according to the type of danger in the area where the gas detector is
installed, proceed as follows:
1. Disconnect the power supply to the gas detector at the Control unit.
2. Remove the sensor junction box cover.
3. Note the wire colours and numbering of the terminal board and disconnect the sensor wires.
4. Unscrew the sensor from the junction box.
5. Screw the new sensor into the junction box using the correct size of tool across the hexagon flats.
6. Connect the sensor wires to the terminal block and ensure they are connected to the correct terminals.
Refer also to the wiring diagram in Section 10 .
Close the sensor junction box cover and ensure that the gas detector is in compliance with all relevant safety regulations
and directives.
5.3 Series 47K-PRP and Series 47K-HT-PRP
For the gases or vapours shown in the tables of Section 5.3.1 and 5.3.2 the response curves have been tested
according to EN 60079-29-1. If the LEL of a substance was not listed in EN 60079-20-1, the LEL has been taken from
the Chemsafe data base [Dechema, Frankfurt]. Due to legal requirements other locally used LEL values might be
mandatory.
It is highly recommended that the gas detector is exposed to clean air when calibrating the zero and a mixture of the
target gas in air with a concentration of approximately 50% LEL. Other gases/ vapours on request.
If calibration with the target gas is not possible a reference calibration can be performed with 0,85 vol% Propane C3H8in
air and using the relative response data given in the table of Section 5.3.1 and 5.3.2 . These values are only valid for
15 Series 47K GB
5 Maintenance and Service

new sensors and may vary after aging or poisoning.Unless otherwise stated, they refer to an ambient temperature of 20
°C. If using a reference gas to calibrate the gas detector the displayed values may vary by up to ±20% from the target
gas concentration.
Customers using the catalytic combustible gas sensors to detect hydrogen and hydrocarbons in an environment that
may contain polar solvents must:
• Calibrate their sensors with the target gas. Do not use a surrogate gas for calibration.
• After exposure to polar solvents, the sensor must be recalibrated using the target gas, independent of the
calibration interval, and a gas/ function check shall be performed 24 hours after calibration to verify sensor
response and accuracy.
Reference calibration example for 50% Acetone:
1. Relative response factor for Acetone from table in
Section 5.3.2 .= 0.94
2. Propane calibration gas concentration being used = 0.89 vol% C3H8
3. Propane volume concentration for 100% LEL = 1.7 vol%
4. Propane calibration gas concentration in % LEL
= 52.4% LEL
5. Gas detector span setting = 52.4% LEL x 0.94 = 49.3% LEL
5.3.1 47K-HT-PRP
Relative response factors of tested gases with reference to Propane.
These values are only valid for new sensors and may vary after aging or poisoning. Unless otherwise stated, refer to an
ambient temperature of 110 °C. In this case the displayed values may vary by up to ±20% from the target gas
concentration.
Sample Gas 100% LEL in
vol%
Propane relative
response factor
Response time
[secs] t50 *)
Response time
[secs] t90 *)]
Methane(pending) 4.4 0.52 < 8 < 14
*) Response times are with a flow through adapter and a gas flow of 1 l/min
5.3.2 47K-PRP
Relative response factors of tested gases with reference to Propane.
These values are only valid for new sensors and may vary after aging or poisoning. Unless otherwise stated, refer to an
ambient temperature of 20 °C. The response factors can have a deviation up to 20%. Response times stated in the
enclosed table may vary by ±20% depending on the tolerances of individual sensors.
Sample Gas 100% LEL in
vol%
Propane relative
response factor
Response time
[secs] t50 *)
Response time
[secs] t90 *)]
Acetone 2,5 0.94 < 14 < 27
2-Butanone 1,5 1.30 < 16 < 41
GB Series 47K 16
5 Maintenance and Service

Sample Gas 100% LEL in
vol%
Propane relative
response factor
Response time
[secs] t50 *)
Response time
[secs] t90 *)]
Ethanol 3,1 0.97 < 14 < 31
1-Ethoxy-2 propanol
[30°C]
1,3 1.76 < 26 < 82
Ethyl acetate 2,0 1.19 < 16 < 36
FAM-Benzin 65/95
Gasoline 65/95
0,7 2.00 < 14 < 25
Hydrogen 4 0.59 < 9 < 17
Methane 4,4 0.58 < 11 < 18
Propane 1,7 1.00 < 12 < 19
1-Propanol [30 °C] 2,1 1.30 < 17 < 61
2-Propanol 2 1.07 < 15 <29
Propene 2 0.82 < 12 < 21
Toulene 1,0 1.36 < 21 < 54
n-Nonane [30 °C] 0,7 2.0 < 20 < 46
*) Response times are with a flow through adapter and a gas flow of 1 l/min
Response factor measured by DEKRA Testing and Certification GmbH
Other gases/vapours on request.
17 Series 47K GB
5 Maintenance and Service

6 Accessories
6.1 Calibration Cap
The calibration cap is pushed on to the front of the sensor and is sealed by an “O” ring. The surface area S < 20 cm2.
WARNING!
The calibrating cap must be removed after completing the calibration!
The gas is supplied via either of the gas inlets by means of suitable flexible tube.
Failure to follow these warnings can result in serious personal injury or death.
Gas flow rate: 1.0 l/min ±20%
6.2 Weather Protection Cap
The weather protection cap, protecting the sintered disc of the sensor from splash-water, is recommended for outdoor
installations. It is available in Stainless Steel 316.
The stainless steel versions are available with hose or pipe connection for remote calibration.
Pipe connection : 1/8” NPT
Gas flow rate : 1.0 l/min ±20%
Air velocity : 0 ... 6 m/s
Calibration must only be carried out if wind speed is < 1.5 m/s.
Using the Weather Protection Cap will extend the response time to:
t90 < 80 sec for methane / t90 < 130 sec for propane
The signals will be reduced by up to 20% when using the weather protection cap. This must be taken into consideration
during calibration and when adjusting alarm levels. The cap must not be used if the incident flow is bottom up.
GB Series 47K 18
6 Accessories

6.3 Flow Through Adapter/ Pump Adapter
Figure 1 Flow Through Adapter
The flow through adapter is for use with a pumped sampling system.
Pipe connection : 1/8” NPT
Gas flow rate : 1.0 l/min ±20%
Using the Flow Through Adapter will extend the response time, depending on the gas flow rate and the length of the
tubes. Only the pressure range from 800 to 1200 hPa is allowed. The gas flow has to be monitored.
6.4 Duct Mount Flange
Gas monitoring in air ducts can be performed by means of this duct mount flange. When installing it the direction of flow
inside the duct must be towards the baffle as shown in the photograph.
The sensor can be calibrated via the gas calibration port, provided the duct is free of all gases to which the sensor will
respond. If the duct cannot be gas freed, the sensor has must be removed form the duct during calibration.
The calibration port must be sealed again with the locking cap after calibration has been carried out.
Figure 2 Duct Mount Flange
1. Flow 2. Gas calibration point
In this Picture will be the flow from the bottom up.
You should calibrate with the calibration port only during air velocity < 5 m/s for Series 47K-PRP and 47K-HT-PRP in the
air duct.
The response times given in Chapter 2.3 are for an air velocity of 20 m/s.
Doubling of the response time has to be expected for an air velocity of 0.5 m/s.
19 Series 47K GB
6 Accessories

Gas flow rate : 1.0 l/min ±20% [gas calibration]
Air velocity : 0.5 ... 20 m/s
6.5 Pipe Mounting Kit
NOTE: The pipe mounting kit (P/N 10 113032) is not included in the EC-Type Examination Certificates DMT 01 ATEX G
001 X, BVS 03 ATEX G 010 X, DMT 03 ATEX G 003 X, BVS 16 ATEX G 001 X, FTZU 07 ATEX E 0066 X and INERIS
00 ATEX 0028 X
6.5.1 Mounting Kit for Pipes with a Diameter of up to 50 mm
The S 47K-PRP can be mounted vertically by fastening its legs by means of three screws. Additionally, a pipe mount kit
allowing the detector to be fixed to pipes or poles is available as an accessory. The kit consists of:
• one universal mounting plate,
• one retaining plate for pipes with a diameter of 20–30 mm,
• one retaining plate for pipes with a diameter of 30–50 mm,
• two tightening straps for pipes with a diameter of 50–150 mm.
1. Mounting plate 2. Pipe clamp
GB Series 47K 20
6 Accessories