Consilium Salwico GD User manual

Technical Manual
Salwico GD
Gas Detector

Salwico GD Technical Manual 5100516-00A Rev:A01
2
1 Safety
Ensure that this Operating Manual is read and understood BEFORE installing / operating /
maintaining the equipment. Pay particular attention to Warnings and Cautions. All document
Warnings are listed here and repeated where appropriate at the start of the relevant chapter(s) of
this Operating Manual. Cautions appear in the sections/sub-sections of the document where they
apply.
WARNINGS
Salwico GD is designed for installation and use in Zone 1 or 2 hazardous areas in
many countries including Europe and for Class 1 Division 1 or 2 area applications in
North America.
Installation must be in accordance with the recognized standards of the appropriate authority in the
country concerned.
Access to the interior of the detector, when carrying out any work, must only be conducted by trained
personnel.
Before carrying out any work ensure local regulations and site procedures are followed. Appropriate
standards must be followed to maintain the overall certication of the detector.
For installations where conduit is used, and the sensor is mounted directly to the Salwico GD, there
must be a “Seal Fitting” installed for each of the cable gland entries within 18 inches of the
Salwico GD. The total distance of the location of these Seal Fittings is 18 inches. (e.g. If all 3 gland
entries are to be used, 3 Seal Fittings should be located, each within 6 inches of the wiring entrance).
In order to maintain electrical safety, the product must not be operated in atmospheres with more than
21% oxygen. Oxygen decient atmospheres (Combustible: less than 10%V/V, Toxic: less than 6%V/V)
may suppress the sensor output.
If using an anti-seize compound, the threads should be thinly coated with an approved silicone free
compound e.g. petroleum jelly
To reduce the risk of ignition of hazardous atmosphere, de-classify the area or disconnect the
equipment from the supply circuit before opening the detector enclosure. Keep assembly tightly
closed during operation.
Never attempt to open a junction box/enclosure or replace/ret the sensor in potentially hazardous
atmospheres while power is still applied to the transmitter.
The detector must be earthed/grounded for electrical safety and to limit the effects of radio frequency
interference. Earth/ground points are provided inside and outside the unit. The internal grounding
shall be used as the primary equipment ground. The external terminal is only a supplemental bonding
connection where local authorities permit or require such a connection.
Ensure that all screens/instrument earth/clean earth wiring is earthed/grounded at a single point (either
at the controller or detector - BUT NOT BOTH) to prevent false readings or alarms that may occur due
to potential earth/ground loops.
Take care when handling sensors as they may contain corrosive solutions.
Do not tamper with or in any way disassemble the sensor.
Do not expose to temperatures outside the recommended ranges.
Do not expose sensors under storage conditions to organic solvents or ammable liquids.
At the end of their working life, replacement electrochemical sensors for oxygen and toxic gas must
be disposed of in an environmentally safe manner. Disposal should be according to local waste
management requirements and environmental legislation.
Alternatively, old replaceable sensors may be securely packaged and returned to Consilium clearly
marked for environmental disposal.
Electrochemical sensors should NOT be incinerated as this action may cause the cell to emit toxic
fumes.
Refer to the local or national regulations relative to the installation at the site. For Europe see
EN60079-29-2, EN60079-14, EN45544-4 and EN61241-14.
This equipment is designed and constructed as to prevent ignition sources arising, even in the event
of frequent disturbances or equipment operating faults.
The sensor head must be tted with the supplied weather protection, and mounted so that the sinter
is pointing downward to provide ingress protection IPX6.
The weather protection is a potential electrostatic charging hazard. The manufacturer’s instructions
should be observed.
NOTE: The control card must have a suitably rated fuse.

Salwico GD Technical Manual 5100516-00A Rev:A01
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Special conditions for safe use – Salwico GD with
Flammable Sensor:
1. Compliance with the Technical Manual is required for safe use of Salwico GD.
2. The following environmental conditions of operation apply for the use of the
Salwico GD:
Temperature: -25 °C to +55 °C
Relative humidity: 0 % to 90 %
Pressure: 80 kPa to 120 kPa
(extended range for temperature and humidity according to EN 60079-29-1)
3. In order to minimise measurement errors, the ambient conditions (temperature,
pressure, humidity) during the calibration of the measuring channels should be as
close as possible to those to be encountered during normal operation.
4. Measuring values from -4 %LEL to +2 %LEL are indicated as "0 %LEL"
(4 mA analogue output) in the measuring mode. Below -4 %LEL is indicated as “-0”
(3.5 mA) and below -5 %LEL (1 mA) a fault “F03” message is given additionally.
5. Measuring values beyond the end of the measuring range are indicated as
100 %LEL and alternately blinking “W04” and “W05”. The analogue output is set to
22 mA.
6. Special states for Analogue output:
 • ≤1mA: Systemandotherfaults
• 2 mA: Start up, Inhibit
• 3.5 mA Under range
• 22 mA: Over range
7. If the Salwico GD is operating in conjunction with a control unit to analyse the
measuring signal, the control unit must operate correctly when the Salwico GD transmits
a value outside of the measuring range.
8. If substances (e. g. sensor poisons) that could interfere with and affect the sensitivity
of the sensing device are to be expected in the atmosphere to be monitored which
may cause a rapid change of sensitivity, the calibration interval shall be reduced.
9. Before use, ensure that any alarm delay set is suitable for the intended application.
10. Some types and concentrations of dust in the measured atmosphere may impair the
measuring function of the gas detector.
11. Use only with the Weather Protection Cup accessory.
12. TheEC-TypeexaminationcerticateonlyappliestothemeasuringofMethane,
Ethane and Propane in air and up to the Lower Explosive Limit (LEL). Additional
 subtestsofanATEXnotiedbodyarerequiredforthemeasuringofotherammable
 gases,theresultsbeinginformedaboutasadditiontothiscerticate.
Special conditions for Salwico GD with Oxygen Sensor:
1. Compliance with the Technical Manual is required for safe use of Salwico GD.
2. The following environmental conditions of operation apply for the use of Salwico GD
with oxygen sensor:
Temperature: -20 °C to +55 °C
Relative humidity: 20 % to 90 %
Pressure: 80 kPa to 120 kPa
(extended range for temperature according to EN 50104)

Salwico GD Technical Manual 5100516-00A Rev:A01
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3. In order to minimise measurement errors, the ambient conditions (temperature,
pressure, humidity) during the calibration of the measuring channels should be as
close as possible to those to be encountered during normal operation.
4. Measuring values from 20.7 % (v/v) up to 21.1 % (v/v) are indicated as
"20.9" % (v/v) oxygen during operation in the measuring mode. Measuring values
below 3 % (v/v) oxygen are indicated as 0 % (v/v) oxygen (analogue output 4 mA).
5. Measuring values above the end of the measuring range are indicated as 25 % (v/v)
O2and blinking “W04”. The analogue output is set to 22 mA.
Fault messages are shown on the display as “F-XX” and the analogue output is set
to 1 mA.
6. Special states for Analogue output:
 • ≤1mA: Systemandotherfaults
• 2 mA: Start up, Inhibit
• 22 mA: Over ranging
7. If the Salwico GD is operating in conjunction with a control unit to analyse the
measuring signal, the control unit must operate correctly when the Salwico GD
transmits a value outside of the measuring range.
8. Use without Weather Protection Cup accessory only.
9. If substances (e. g. sensor poisons) that could interfere with and affect the sensitivity
of the sensing device are to be expected in the atmosphere to be monitored which
may cause a rapid change of sensitivity, the calibration interval shall be reduced.
10. Before use, ensure that any alarm delay set is suitable for the intended application.
11. Before use, consideration must be given to cross sensitivity to other gases. Refer to
the Salwico GD Technical Manual and the Sensor Datasheet for cross
interference data.
12. Some types and concentration of dust in the measured atmosphere may impair the
measuring function of the gas detector.
13. TheTypeExaminationCerticateappliestothemeasurementofoxygenupto
25 % (v/v).

Salwico GD Technical Manual 5100516-00A Rev:A01
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2 Information
This manual is for use with the Salwico GD range transmitters only.
The Start-up/Surge/In rush current is dependant on the type of power supply used. The
typical start-up current for Salwico GD is less than 800mA. Measure the start-up current
usingthespecicpowersupplybeforeinstallationtoensuresuitabilityforyourapplication.
Consilium can take no responsibility for installation and/or use of its equipment if not done
so in accordance with the appropriate issue and/or amendment of the Operating Manual.
The reader of this Operating Manual should ensure that it is appropriate in all details for
the exact equipment to be installed and/or operated. If in doubt, contact Consilium for
advice.
The following types of notices are used throughout this Operating Manual:
WARNING
Identies a hazardous or unsafe practice which could result in severe injury or
death to personnel.
Caution: Identies a hazardous or unsafe practice which could result in minor injury
to personnel, or product or property damage.
Note: Identies useful/additional information.
Every effort has been made to ensure the accuracy of this document, however, Consilium
can assume no responsibility for any errors or omissions in this document or their
consequences.
Consilium would greatly appreciate being informed of any errors or omissions that may be
found in the content of this document.
For information not covered in this document, or if there is a requirement to send
comments/corrections about this document, please contact Consilium using the contact
details given on the back page.
Consilium reserve the right to change or revise the information supplied in this
document without notice and without obligation to notify any person or organization
of such revision or change. If information is required that does not appear in this
document, contact the local distributor/agent or Consilium.

Salwico GD Technical Manual 5100516-00A Rev:A01
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3 Table of contents
1 Safety 2
2 Information 5
3 Table of contents 6
4 Introduction 8
4.1 Transmitter 9
4.2 Flammable, Toxic Oxygen Gas sensors 9
4.3 Accessories 10
5 Installation 11
5.1 Mounting and location 12
5.2 Mounting the transmitter 12
5.3 Installing the sensor 13
6 Electrical connections 14
6.1 Transmitter Wiring 15
6.2 Terminal connections 16
6.3 Power 17
6.4 Cabling 18
6.5 Cable and Earth/Ground regimes 18
6.6 Ground Terminal Wiring 19
7Defaultconguration 20
8 Normal Operation 21
8.1 Display Screen 21
8.2 System Status 22
8.3 Magnetic Wand Activation 23
8.4 Operation Mode Structure 23
9 First time switch on (Commissioning) 24
10 Response Check and Calibration 26
10.1 Zeroing and span calibration 26
10.2ZeroingandspancalibrationofHydrogenSuldesensors 30
11 General Maintenance 31
11.1 Operational Life 31
12 Servicing 32
12.1 Sensor replacement 32
12.2 Replacing Modules within the Transmitter 34
12.3 Faults and Warnings 35
13Menu’sandAdvancedConguration 36
13.1 Abort Function 36
13.2CongurationMode 36
13.2.1Congurationmodeoperationtable 39
13.3 Sensor / Gas Selection 41
13.3.1 Sensor Selection 41
13.3.2 Gas Selection 41
13.4 Review Mode 43

Salwico GD Technical Manual 5100516-00A Rev:A01
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14Generalspecication 46
15 Warranty statement 48
16 Installation Drawing 49
16.1 Mechanical Installation Drawing 49
16.2 Collecting Cone Drawing 50
16.3 Mounting Bolt Assy Drawing 51
16.4 Mounting Bracket Drawing 52
17Certication 53
17.1 ATEX Special Conditions for Safe Use 53
17.2 Salwico GD ATEX Name Plate 54
17.3 Sensor Cartridges Label 55
18 EC Declaration of Conformity 56
19 Cross Interference and Cross Calibration 57
19.1 Cross Interference Table for Toxic and Oxygen 57
19.2 Cross Calibration Flammable Gas Detector 58
19.3 Meter Multiplication Factors for Salwico GD-IR Propane 61

Salwico GD Technical Manual 5100516-00A Rev:A01
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Locking
Grub
screw
Sensor Retainer
Internal Earth
Point
Enclosure
External Earth
Point (x2)
Field Cable/Conduit Entries
(x2)
Locking Grub screw
Cover
Seal
Display Module
Terminal Module
Sensor Socket
Plug-In Sensor Cartridge
Ex d Plug
Integral
mountin
g p
late
Certification Label
4 Introduction
The Salwico GD comprises a gas detector transmitter and a choice of sensors for
detectingammablegas,toxicgasandoxygen.TheconstructionofSalwicoGDallowsit
tobeusedinhazardousarealocations;itmayalsobeusedinotherareasnotclassied
as hazardous.
A wide range of Consilium Salwico GD sensors may be used with the Salwico GD
transmitter to detect a broad range of target gases (please contact Consilium for further
details).
The transmitter features a display and three programmable relays for controlling external
equipment e.g. alarms, sirens, valves or switches. The transmitter provides an industry
standard 3-wire, 4-20mA source or sink output for connection to a dedicated gas detection
control system or PLC.
Calibration and maintenance is carried out using a Magnetic Wand, this allows a single
user to undertake routine maintenance without needing to access internal components.
Salwico GD is suitable for use in Zone 1 or 2 hazardous areas (International) or Class I
Division 1 or 2 area applications (North America).
Salwico GD comprises of the main parts as shown below.
Diagram 1. – Exploded View

Salwico GD Technical Manual 5100516-00A Rev:A01
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4.1 Transmitter
The transmitter enclosure has three threaded entries. The two cable/conduit entries either
side of the upper part of the transmitter housing are for connecting the power source,
signal output and relay contacts to associated signalling equipment. The bottom entry
allows direct connection of the sensor socket. There is a mounting plate incorporated into
thetransmitterhousingallowingforvariousmountingcongurationoptions.
A local LCD provides gas type, concentration, alarm and operating status. The display
provides numerical, bar graph and icon information.
Diagnostic information may also be displayed when the transmitter is interrogated using
a magnet. The transmitter cover has a glass window which allows use of the Magnetic
Wand to activate the three user interface magnetic switches that are located on the front
of the display module. The magnet also enables a non intrusive, one-man calibration and
congurationfacilityfortheSalwicoGD.
4.2 Flammable, Toxic and Oxygen Gas sensors
The Salwico GD transmitter is designed to work with a variety of gas sensors
for detecting flammable gases. Salwico GD sensors use NDIR infrared and
electro-catalytic technologies.
In addition, the Salwico GD transmitter is designed to work with a wide range of
toxic gas sensors. Salwico GD sensors for monitoring toxic gas or oxygen use
electro-chemicalcell(ECC)technology.OxygensensorsmeasureOxygendeciencyand
enrichment in the range 0 - 25 %V/V. They do not measure inertization.
Diagram 2: Salwico GD Display and Magnetic Switches
Measuring
Units
InhibitIcon
Test Pass Icon
Warning/
FaultIcon
Magnetic Wand
activation Icon
Gas Type
Magnetic
MENU/ENTER
Switch
Magnetic
UP Switch
Magnetic
DOWN
Switch
Gas Reading
Bar Graph
Alarm Icon
Full Scale
Calibration Icon
Salwico GD

Salwico GD Technical Manual 5100516-00A Rev:A01
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4.3 Accessories
A range of accessories are available to allow use of Salwico GD in a wide variety of
applications. These including mounting brackets, maintenance tools, weather housings,
owhousing,collectingcone,ductmountingkitandsensorjunctionboxes.
Diagram 3: Salwico GD Flammable, Toxic and Oxygen Sensor Cartridge
Standard Weather Protection Magnetic wand
The Standard Weather Protection is designed to
protect the sensor from changes in environmental
conditions.Thisisrecommendedtobetted
to a Salwico GD sensor for outdoor exposed
applications,
(supplied with Salwico GD kit).
The magnetic wand is used as a tool to allow
the user to communicate with the Salwico GD
transmitterforthepurposeofconguration,
calibration and interrogating system status,
(supplied with Salwico GD kit).
Gassing Cap
The Gassing Cap is an optional accessory that
maybetemporarilyttedtothesensorinplace
of the Weather Protection for Gas Response
checking during commissioning and routine
maintenance.

Salwico GD Technical Manual 5100516-00A Rev:A01
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5 Installation
WARNINGS
Salwico GD is designed for installation and use in Zone 1 or 2 hazardous areas in many
countries including Europe and for Class 1 Division 1 or 2 area applications in North
America.
Installation must be in accordance with the recognized standards of the appropriate
authority in the country concerned.
Access to the interior of the detector, when carrying out any work, must only be conducted
by trained personnel.
Before carrying out any work ensure local regulations and site procedures are followed.
Appropriate standards must be followed to maintain the overall certication of the detector.
Care should be taken when removing and retting the Salwico GD plug-in Sensor to the
Sensor Socket so that damage to the connection pins can be avoided.
For installations where conduit is used, and the sensor is mounted directly to the
Salwico GD, there must be a “Seal Fitting” installed for each of the cable gland entries
within 18 inches of the Salwico GD. For installations where the sensor will be mounted
remotely from Salwico GD, an additional “Seal Fittings” will be required: One at each of
the conduit entries for the power/signal/relay contact outputs and one at the sensor wiring
entrance. The total distance of the location of these Seal Fittings is 18 inches. (e.g. If all 3
gland entries are to be used, 3 Seal Fittings should be located, each within 6 inches of the
wiring entrance).
If using an anti-seize compound, the threads should be thinly coated with an approved
silicone free compound e.g. petroleum jelly
To reduce the risk of ignition of hazardous atmosphere, de-classify the area or disconnect
the equipment from the supply circuit before opening the detector enclosure. Keep
assembly tightly closed during operation.
Never attempt to open a junction box/enclosure or replace/ret the sensor in potentially
hazardous atmospheres while power is still applied to the transmitter.
The detector must be earthed/grounded for electrical safety and to limit the effects of
radio frequency interference. Earth/ground points are provided inside and outside the unit.
Ensure that all screens/instrument earth/clean earth wiring is earthed/grounded at a single
point (either at the controller or detector - BUT NOT BOTH) to prevent false alarms due to
earth/ground loops.
Take care when handling sensors as they may contain corrosive solutions.
Do not tamper with or in any way disassemble the sensor.
Do not expose to temperatures outside the recommended ranges.
Do not expose sensors under storage conditions to organic solvents or ammable liquids.
At the end of their working life, replacement electrochemical sensors for oxygen and toxic
gas must be disposed of in an environmentally safe manner. Disposal should be according
to local waste management requirements and environmental legislation.
Alternatively, old replaceable sensors may be securely packaged and returned to Consilium
clearly marked for environmental disposal.
Electrochemical sensors should NOT be incinerated as this action may cause the cell to
emit toxic fumes.
Refer to the local or national regulations relative to the installation at the site. For Europe
see EN60079-29-2, EN60079-14, EN45544-4 and EN61241-14.
This equipment is designed and constructed as to prevent ignition sources arising, even in
the event of frequent disturbances or equipment operating faults.
The sensor head must be tted with the supplied weather protection, and mounted so that
the sinter is pointing downward to provide ingress protection IPX6.
The weather protection is a potential electrostatic charging hazard. The manufacturer’s
instructions should be observed.
NOTE: The control card must have a suitably rated fuse.

Salwico GD Technical Manual 5100516-00A Rev:A01
12
5.1 Mounting and location
Gas detectors should be mounted where a potential hazard of gas is most likely to be
present. The following points should be noted when locating gas sensors.
• When locating detectors consider the possible damage caused by natural events e.g.
rainorooding.
• Consider ease of access to the gas detector for functional testing and servicing.
• Consider how escaping gas may behave due to natural or forced air currents.
Note: The placement of gas detectors should be determined following the advice of
experts having specialist knowledge of gas dispersion, experts having knowledge of the
process plant system and equipment involved, safety and engineering personnel. The
agreement reached on the location of detectors should be recorded.
5.2 Mounting the transmitter
The Salwico GD transmitter has an integral mounting plate consisting of four mounting
holesonthetransmitterbody.Thetransmittermaybexeddirectlytoasurfacemounting,
or to a horizontal or vertical pipe/structure, 40.0-80.0mm (1.6 to 3.1 inches) in diameter/
cross section.
Caution: The location of gas detectors should be made in accordance with any relevant
local and national legislation, standards or codes of practice. Always replace sensors
with a sensor of the same type.
Diagram 4: Outline and mounting dimensions
All dimensions are
shown in mm.
M20 entries for
ATEX/IECEx/AP
Versions

Salwico GD Technical Manual 5100516-00A Rev:A01
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5.3 Installing the sensor
The Salwico GD gas sensor cartridge plugs into the Salwico GD Sensor Socket.
WARNINGS
Care should be taken when removing and retting the Salwico GD plug-in Sensor to the
Sensor Socket so that damage to the connection pins can be avoided.
If using an anti-seize compound, the threads should be thinly coated with an approved
silicone free compound e.g. petroleum jelly
Take care when handling old sensors as they may contain corrosive solutions.
Take care when removing or replacing the Sensor Retainer as there may be sharp edges
present on the adjoining threads.
The equipment is designed and constructed as to prevent ignition sources arising, even in
the event of frequent disturbances or equipment operating faults.
The sensor head must be tted with the supplied weather protection, and mounted so that
the sinter is pointing downward to provide ingress protection IPX6.
The weather protection is a potential electrostatic charging hazard. The manufacturer’s
instructions should be observed.
To install the Salwico GD Sensor Cartridge to the Salwico GD Sensor Socket:
1. Removetheweatherprotection(iftted)fromthesensor.
2. Use a 1.5mm Allen key (hexagonal wrench-included) to loosen the Locking Grub
Screw on the Sensor Retainer.
3. Unscrew and remove the Sensor Retainer.
4. Remove the Salwico GD Sensor Cartridge from its packaging and plug it into the
Salwico GD Sensor Socket, taking care to align the sensor pins with the connector.
5. RettheSensorRetainerandtightentheLockingGrubScrew.
6. Rettheweatherprotection(asrequired)totheSalwicoGDsensor.
Sensor Socket
Weather Protection
Plug-In Sensor Cartridge
Sensor Retainer
Locking Grub Screw
Diagram 6: Installing the Sensor

Salwico GD Technical Manual 5100516-00A Rev:A01
14
6 Electrical connections
WARNINGS
Salwico GD is designed for installation and use in Zone 1 or 2 hazardous areas in many
countries including Europe and Class 1 Division 1 or 2 area applications in North America.
Installation must be in accordance with the recognized standards of the appropriate
authority in the country concerned.
Access to the interior of the detector, when carrying out any work, must only be conducted
by trained personnel.
Before carrying out any work ensure local regulations and site procedures are followed.
Appropriate standards must be followed to maintain the overall certication of the detector.
Care should be taken when removing and retting the Salwico GD Sensor Cartridge to the
Sensor Socket so that damage to the connection pins can be avoided.
For installations where conduit is used, and the sensor is mounted directly to the Salwico
GD, there must be a “Seal Fitting” installed for each of the cable gland entries within 18
inches of the Salwico GD. The total distance of the location of these Seal Fittings is 18
inches. (e.g. If all 3 gland entries are to be used, 3 Seal Fittings should be located, each
within 6 inches of the wiring entrance).
If using an anti-seize compound, the threads should be thinly coated with an approved
silicone free compound e.g. petroleum jelly
To reduce the risk of ignition of hazardous atmosphere, de-classify the area or disconnect
the equipment from the supply circuit before opening the detector enclosure. Keep
assembly tightly closed during operation.
Never attempt to open a junction box/enclosure or replace/ret the sensor in potentially
hazardous atmospheres while power is still applied to the transmitter.
The detector must be earthed/grounded for electrical safety and to limit the effects of
radio frequency interference. Earth/ground points are provided inside and outside the unit.
Ensure that all screens/instrument earth/clean earth wiring is earthed/grounded at a single
point (either at the controller or detector - BUT NOT BOTH) to prevent false alarms due to
earth/ground loops.
Take care when handling sensors as they may contain corrosive solutions.
Do not tamper with or in any way disassemble the sensor.
Do not expose to temperatures outside the recommended ranges.
Do not expose sensors under storage conditions to organic solvents or ammable liquids.
At the end of their working life, replacement electrochemical sensors for oxygen and toxic
gas must be disposed of in an environmentally safe manner. Disposal should be according
to local waste management requirements and environmental legislation.
Alternatively, old replaceable sensors may be securely packaged and returned to Consilium
clearly marked for environmental disposal.
Electrochemical sensors should NOT be incinerated as this action may cause the cell to
emit toxic fumes.
Refer to the local or national regulations relative to the installation at the site. For Europe
see EN60079-29-2, EN60079-14, EN45544-4 and EN61241-14.

Salwico GD Technical Manual 5100516-00A Rev:A01
15
6.1 Transmitter Wiring
The Salwico GD transmitter may be wired in either Current SOURCE or Current SINK
conguration.Thesetwooptionsareofferedtoallowgreaterexibilityinthetypeofcontrol
system that it can be used with. SOURCE/SINK is selectable via the switch located on
the back side of the display module; accessible by removing the display module during
installation / commissioning (see section 9).
Caution: All electrical connections should be made in accordance with any relevant
local or national legislation, standards or codes of practice.
Note: Terminate cable screen at detector or controller, not both.
250ohm load resistor (RL) is installed in the factory, In case of connection with controller,
this resistor should be removed because controller has load resistor internally.
Controller
+VE
Signal
1
2
3
Detector
+VE
Signal
-VE
R
L
-VE
1
3
2
Controller
+VE
Signal
1
2
3
Detector
+VE
Signal
-VE
R
L
-VE
1
3
2
Salwico GD Source 3 Wire 4-20mA (Source)
Salwico GD Sink 3 Wire 4-20mA (Sink)
RL
Controller
+VE
Signal
1
2
3
Detector
+VE
Signal
-VE -VE
1
3
2
RL
Controller
+VE
Signal
1
2
3
Detector
+VE
Signal
-VE -VE
1
3
2

Salwico GD Technical Manual 5100516-00A Rev:A01
16
6.2 Terminal connections
Note: Ensure that none of the wires in the terminal area cause an obstruction when
retting the Display Module. Ensure that the socket on the Display Module is fully engaged
in the Display Module Connector on the Terminal Module.
Diagram 7: Terminal module
15
Terminal Block
Power & Signal
Display Module
Connector
Display Module
Alignment Pin
Locator
Ground/Earth
Point
Terminal Block
for Relays
Sensor
Connector
Note: Terminal
Blocks are
plug/socket type
and may be
removed to ease
wiring.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Terminal Module Connections
Terminal Number Marking Connection Description
1 24V +VE Supply
Controller Connections
2 0V -VE Supply(0VDC)
3 4~20mA Current Output Signal
4 COM Drain MODBUS RTU.
RS485 (Optional)
5 TxD MODBUS B (+)
6 RxD MODBUS A (-)
7 RLY1/NC Normally Closed Programmable Relay 1
(Default A1)
8 RLY1/COM Common
9 RLY1/NO Normally Open
10 RLY2/NC Normally Closed Programmable Relay 2
(Default A2)
11 RLY2/COM Common
12 RLY2/NO Normally Open
13 RLY3/NC Normally Closed Programmable Relay 3
(Default Fault)
14 RLY3/COM Common
15 RLY3/NO Normally Open
Table 1: Transmitter terminal connections

Salwico GD Technical Manual 5100516-00A Rev:A01
17
6.3 Power
The Salwico GD transmitter requires a power supply from the controller of between 16Vdc
and 32Vdc. Ensure that a minimum supply of 16Vdc is measured at the sensor, taking into
account the voltage drop due to cable resistance.
Themaximumloopresistanceintheeldcableiscalculatedasfollows:
R loop = (V controller – V detector min) / I detector
Example;
The controller is supplying a nominal 24Vdc (V controller), the detector minimum allowable
voltage is 16Vdc (V detector min), therefore the maximum allowable voltage drop between the
controller and detector is 8Vdc; this means a voltage drop of 4V in each core (+ve core
and -ve core).
Power consumption of the detector is 5.0W. The current required to drive the detector at
the minimum voltage is (I = P / V), 5.0 / 16 = 312.5mA (I detector).
So,themaximumeldcableloopresistance(Rloop)=8/0.31=26Ohms,or13Ohms
per core, (allowing for component variations, losses, etc.).
The following tables show the maximum cable distances between the controller and
transmitter assuming a voltage drop of 4V in each core and for different cable parameters.
The tables are examples only and actual cable parameters and source power supply
voltage for the application should be used to calculate the maximum cable distance
allowed at the installation site.
Typical cable data Maximum Cable length (L)**
Cable size
(cross sectional area)
Cable resistance
Ω/km(Ω/mi)
Meters Feet
0.5mm2(20AWG*) 36.8 (59.2) 353 1158
1.0mm2(17AWG*) 19.5 (31.4) 666 2185
1.5mm2(16AWG*) 12.7 (20.4) 1023 3356
2.0mm2(14AWG*) 10.1 (16.3) 1287 4222
2.5mm2(13AWG*) 8.0 (12.9) 1621 5318
*nearest equivalent **example for 24Vdc supply voltage
Table 2: Maximum cable distances
+24V
+20V
(wrt Controller 0V)
+4V
(wrt Controller 0V)
0V
4-20mA
Field Cable (L)
Signal
Diagram 8: Power Connection
16V (min) Controller
Salwico
GD

Salwico GD Technical Manual 5100516-00A Rev:A01
18
6.4 Cabling
Caution: All unused and used cable/conduit entries must be sealed with a suitable
certied sealing plug and cable gland.
Theuseofindustrialgrade,suitablyarmouredeldcableisrecommended.
For example, screened 3 cores (plus screen 90% coverage), suitably mechanically
protected copper cable with a suitable M20 explosion-proof gland, or ¾” NPT steel
conduit, with 0.5 to 2.5 mm2 (20 to 13 AWG) conductors. Ensure the cable gland is
installed correctly and fully tightened. All unused cable/conduit entries must be sealed with
asuitablecertiedsealingplug(oneplugissupplied).
6.5 Cable and Earth/Ground regimes
Effective Earth/Ground bonding is important to ensure good EMC and RFI immunity.
The following diagrams show examples of how to earth/ground bond the cable at
enclosures. The same principles apply to conduit installations. These bonding techniques
provide good RFI/EMC performance. Earth/ground loops must be avoided to prevent the
risk of false signal variation.
Cable to Transmitter
Diagram 9: Controller Grounding
Diagram 10: System grounding
Cable outer sheath Cable inner sheath
Clean / Instrument
Earth Screen
Controller
Power & Signal
Earth Screen
Controller
Transmitter

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19
TheEarthScreenoftheeldcableshouldbe“tiedtoEarth”orconnectedtoGroundat
one point only. It is common practise to adopt a STAR EARTH connection regime where
all instrumentation Screens are connected at one common point.
The Screen at the other end of the cable should be “parked” or terminated into a blank
terminal.
The following diagrams show how to install the wire into the ground screw of the
enclosure.
6.6 Ground Terminal Wiring
Internal Ground connection: Utilize the shield of the wiring cable recommended in the
wiring instructions. For connection to this terminal. Twist the shield wire to avoid stray
shieldwires,Loosenthescrewsufcientlyandwrapthewirearoundthescrewina“U”
shape. Raise the clamp and place the wire between the clamp and ground base, lower the
clamp and tighten the screw to 6.9lb-in torque.
External Ground Connection: If required by local authority, Utilize a No 14 AWG copper,
(Stranded or Solid), wire. Loosen the screw sufficiently to enable ‘wrapping the wire
around the screw in a “U” shape. Raise the clamp and place the wire between the clamp
and ground base, lower the clamp and tighten the screw to10.4lb-in torque.
Loosen the bolt Insert cable Fasten the bolt

Salwico GD Technical Manual 5100516-00A Rev:A01
20
7 Default conguration
TheSalwicoGDtransmitterissuppliedwiththefollowingdefaultconguration.
Function Value/Setting Meaning
Sensor Type Automatic according to Sensor
type connected
Salwico GD recognizes the Salwico GD sensor cartridge
according to the gas type within its own sensor family i.e.
mV, EC or O2.
Signal output
≥0.0<1.0mA Fault (refer to table 5 section 12.3 for details)
2.0 mA or 4.0 mA (17.4mA) Inhibit(duringconguration/usersettings)
For Oxygen, 2.0 mA or 17.4 mA
4.0 mA to 20.0 mA Normal gas measurement
22.0 mA Maximum over range
Alarm Relay 1*
Value is sensor dependant Lower alarm level
De-energized Energizes on alarm
Contact Normally Open (NO) Closes on alarm
Non-latching
Alarm Relay 2*
Value is sensor dependant Higher alarm level
De-energized Energizes on alarm
Contact Normally Open (NO) Closes on alarm
Non-latching
Fault Relay**
<1mA Detector Fault
Energized De-energizes on alarm
Contact Normally Open (NO) Closes on alarm
Non-latching
Inhibit
2.0 mA (default) or 4.0 mA for
Toxic and Flammable
2.0 mA (default) or 17.4 mA
For Oxygen
Signal output inhibited during menu use.
If any relay is set to inhibit relay, then inhibit relay will be
activated.
Timeout Disabled
No inhibit timeout. The detector waits for a button press
before returning to the previous state/setting.
Timeout period can be set in ‘Configure Inhibit’ menu in
Conguration Mode.
Password 0000 (Disabled) 0000 (Password disabled). If changed then password is
activated.
Location
(Tag Number) 0000 Optional feature to identify the location or User’s “Tag” number of the Salwico GD
Temperature oC Option to have oC or oF
ModBus ID, baud rates and Parity bit
ID : 1
Baud rates : 19,200
Parity bit : EVEN
*Alarmrelaysautomaticallyresetwhenreadingfallswithinalarmthresholds.IfrelayconguredtoLATCH,thenrelaysmustberesetusing
the Magnetic Wand.
**Faultstate(faultrelayandanalogueoutput<1mA)isalwaysnon-latching.
Table3:Defaultconguration
Gas Name Default Range Lower Alarm Lower Alarm
Type
Higher Alarm Higher Alarm
Type
Oxygen 25.0%VOL 19.5%Vol Falling 23.5%Vol Rising
HydrogenSulde 50.0ppm 10.0ppm Rising 20.0ppm Rising
Carbon Monoxide 300ppm 100ppm Rising 200ppm Rising
Hydrogen 1,000ppm 200ppm Rising 400ppm Rising
Flammable IR 100%LEL 20%LEL Rising 40%LEL Rising
Flammable CAT 100%LEL 20%LEL Rising 40%LEL Rising
Carbon Dioxide IR 2.00%Vol 0.40%Vol Rising 0.80%Vol Rising
For details of how to change the conguration of the Salwico GD please refer to
section 13.