S&S Northern MERLIN GDP2-X User manual

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 1
MERLIN GDP2X
Safe Area Gas Detector-X Controller


Installation, Operation & Maintenance
Please read this manual carefully and retain for future use.
S&S Northern provide a range of detection panels which can be used in many applications such as factories, car
parks, shopping centres and boiler houses. The GDP2X can be used with up to eight (8) X range gas detectors in a
single cable run for monitoring and detecting gas in zones considered safe including CO, LPG and methane.
The information contained within this manual should be referenced for typical installation and operation only.
For specific requirements that may deviate from the information in this guide –contact your supplier.

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 2
Contents
Important Warning Statements ...........................................................................................3
Installation.............................................................................................................................4
Typical Application, Location & Positioning ....................................................................................4
Access & Mounting ............................................................................................................................5
Internal Board Overview ....................................................................................................................5
Board Connections Overview ...........................................................................................................6
Wiring your Detector ..........................................................................................................................6
Creating a Detector Chain.................................................................................................................7
Detector ID Switches .........................................................................................................................7
120ohm Termination Resistance ......................................................................................................8
Audible Alarm Switch.........................................................................................................................8
Configuration Settings .......................................................................................................................8
Settings Options Explained ...............................................................................................................8
Factory Set Condition ........................................................................................................................9
Trouble Shooting ................................................................................................................................9
Operation ..............................................................................................................................9
Initial Power Up (Commissioning) ....................................................................................................9
Main Screen ........................................................................................................................................9
Zone Status .........................................................................................................................................9
Zone Screens....................................................................................................................................10
Alarm Messages ...............................................................................................................................10
General Maintenance .........................................................................................................11
Cleaning.............................................................................................................................................11
Manual Circuit Simulation Test.......................................................................................................11
Bump Test (Gas Response Check) ................................................................................................11
Service & Field Calibration ................................................................................................13
Overview............................................................................................................................................13
Annual Service Message .................................................................................................................13
Service Mode....................................................................................................................................13
Field Calibration................................................................................................................................14
End of Operational Life (EOL).........................................................................................................15
Specification .......................................................................................................................15

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 3
Important Warning Statements
Please take the time to thoroughly read these instructions which should be retained for future reference.
Detectors are shipped pre-calibrated and configured.
The expected lifetime of a gas sensor is 3-10 years upon initial power up dependant on your target gas and environmental
factors. The device will display a message to indicate this time and should immediately be replaced.
It is recommended that this device be commissioned upon installation and serviced annually by a competent person.
Do not apply lighter gas or other aerosols to the device –this will cause extreme damage to the sensors.
High concentrations of alcohol found in many products may damage, deteriorate or affect the gas sensing elements.
This device is designed to detect the gas type displayed on the screen only.
It is not designed to detect smoke, fire or other gases and should not be used as such.
This device provides early warning of the presence of gas, usually before a healthy adult would experience symptoms. This
warning is possible provided your alarm is installed and maintained in accordance with this manual.
Never ignore your device when in alarm.
This device requires a continual supply of electrical power –it will not work without power.
This device should not be used to substitute proper installation, use and/or maintenance of fuel burning appliances
including appropriate ventilation and exhaust systems.
Multiple detectors may be required to adequately protect property and persons.
This device does not prevent dangerous gasses from occurring or accumulating.
Actuation of your alarm indicates the presence of dangerous levels of gas.
The device is not intended for use in potentially explosive atmospheres.
Seek fresh air supply and contact your local gas emergency service should you suspect a gas leak.
This unit may not fully safeguard individuals with specific medical conditions. If in doubt, consult a doctor/physician.
Your product should reach you in perfect condition, if you suspect it is damaged, contact your supplier.
Manufacturer’s Warranty
Warranty coverage: The manufacturer warrants to the original consumer purchaser, that this product will be free of defects in
material and workmanship for a period of three (3) years from date of purchase or one (1) years for oxygen detectors.
The manufacturer’s liability hereunder is limited to replacement of the product with repaired product at the discretion of the
manufacturer. This warranty is void if the product has been damaged by accident, unreasonable use, neglect, tampering or other
causes not arising from defects in material or workmanship. This warranty extends to the original consumer purchaser of the
product only. Warranty disclaimers: Any implied warranties arising out of this sale, including but not limited to the implied
warranties of description, merchantability and intended operational purpose, are limited in duration to the above warranty period. In
no event shall the manufacturer be liable for loss of use of this product or for any indirect, special, incidental or consequential
damages, or costs, or expenses incurred by the consumer or any other user of this product, whether due to a breach of contract,
negligence, strict liability in tort or otherwise. The manufacturer shall have no liability for any personal injury, property damage or any
special, incidental, contingent or consequential damage of any kind resulting from gas leakage, fire or explosion. This warranty does
not affect your statutory rights. Warranty Performance: During the above warranty period, your product will be replaced with a
comparable product if the defective product is returned together with proof of purchase date. The replacement product will be in
warranty for the remainder of the original warranty period or for six months –whichever is the greatest.
Information on waste disposal for consumers of electrical & electronic equipment.
When this product has reached the end of its life it must be treated as Waste Electrical & Electronics Equipment (WEEE). Any
WEEE marked products must not be mixed with general household waste, but kept separate for the treatment, recovery and
recycling of the materials used. Please contact your supplier or local authority for details of recycling schemes in your area.
At the end of their working life, electrochemical sensors for oxygen and carbon monoxide detectors should be disposed of in an
environmentally safe manner. Alternatively they can be securely packaged and returned to S&S Northern clearly marked for
disposal. Electrochemical sensors should not be incinerated as this may cause the cell to emit toxic fumes.

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 4
Installation
Typical Application, Location & Positioning
The Merlin GDP2X is a multi-safe zone gas detection panel which can be used in many applications such as factories,
car parks, shopping centres and most commonly - boiler houses. It can be used with up to eight Merlin gas detectors
(model X) for monitoring and detecting gas including carbon monoxide, liquid petroleum gas and methane. The
controller panel can be integrated with, but not limited to, a BMS (building management system) a fire panel, external
alarms and remote emergency shut-off buttons.
Locations for detectors will vary based on the intended application and target gas, they should be located near
identified sources of a potential gas leaks/ pockets where hazardous gas could quickly accumulate and areas of
identified consequential risk. The composition of the target gas and its density relative to air are used as the basis for
any recommended height of detector placement. Generally, the installation height of a detector for a heavy gas (such
as propane) would be close to the lowest point in the area, and for a light gas (such as methane) would be close to
the highest point in the area. Any recommended heights may vary based on air flow and temperature conditions in
addition to the proposed application and location –this is particularly apparent with oxygen depletion sensors, and the
target gas that they are used for.
Target Gas
Typical Position
Natural Gas/Methane (NG)
High Level - 300mm (1ft) from ceiling
Liquid Petroleum Gas (LPG)
Low Level - 300mm (1ft) from ground level
Carbon Monoxide (CO)
Breathing Zone - 1700mm (5ft 6”) from ground level
Hydrogen (H)
High Level - 300mm (1ft) from ceiling
Oxygen (O2)
*Breathing Zone - 1000-1500mm (3 - 5ft) from ground level
* If you are installing and monitoring Oxygen depletion –consider the density of gas for its application and position
the detector accordingly i.e. ground level for high density gases.
The control panel should be located away from the area that it is monitoring and accessible is for both status
observation and alarm purposes. The control panel should be located outside of the hazardous area that it is
monitoring. Easy access is required both for status observation and alarm purposes.
Where detector cable runs may exceed 100 metres from one control panel –Contact your supplier!
The use of sound strobes are highly recommended!
Refer to your detector manual for further information regarding coverage, location and positioning including
areas and conditions to avoid!

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 5
Access & Mounting
Unpack all the parts!
Designed for surface mounting, it must be installed by a licensed, insured contractor or competent person.
Carefully remove the front cover from the unit by unscrewing the four
bolts located at each corner. To do this –use the socket wrench
provided. Mark the four screw holes located on the back of the
enclosure to the wall and ensure the wall surface is flat to prevent base
distortion.
After executing the mounting and the connections –replace the front
cover and insert the security caps over the four bolts.
Access to the interior of the panel, when carrying out any work, must be conducted by a competent person.
Before carrying out any work ensure local regulations and site procedures are followed.
We recommend all Merlin gas detection equipment and systems are commissioned by a competent/trained
engineer to ensure correct installation and operation. Contact S&S Northern for more information.
Internal Board Overview
Note: Terminal blocks are plug/socket type and may be removed to ease wiring.
Be careful when creating access for cables –Damage to circuit boards will void any warranty!
Detectors must be earthed/grounded for electrical safety and to limit the effects of EMC or R/F interference!
For MODBUS communications, a shielded cable is used!
Detectors are shipped pre-calibrated and configured!

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 6
Board Connections Overview
POWER / LINE IN 100-240vac mains power supplied to the [POWER/LINE IN] connector using a 3-core cable and
fused at 3A. On connecting the mains supply to the panel the power LED indicator will light up –this is located on the
front cover.
VALVE OUT 100-240vac electrical power output from the [VALVE OUT] connector using a 3 core cable can be
connected to a gas solenoid valve which can shut the gas supply on alarm status. Refer to your valve manual for more
information.
DETECTOR CHAIN 24vdc power supply and MODBUS communication data cables are wired up to 8 detectors,
chained in parallel up to approx. 100 yards from the panel depending on the chain configuration, wire type for power
and condition. For more information see section: Wiring your detector.
EM STOP Open/close connections for external shut-off buttons. If using multiple shut off buttons, wire in parallel.
HEAT SENSOR Open/close connections for heat sensors/thermal links.
BMS OUTPUT Volt free connections are available on the board for Building Management Systems.
This is a relay that changes state in alarm or when the gas line is on/off and can be used in conjunction with the 24vdc
output and other external relays that affect other devices and controls such as purge fans and audible alarms etc.
FIRE PANEL Open/close connections for fire alarms/panels.
SOUNDER-STROBE 24vdc connections for an external sounder alarm/ strobe lighting to activate on alarm.
Wiring your Detector
24vdc power and MODBUS communication cables wired to terminals marked [DETECTOR CHAIN + - D+ D-].
[SHEILD WIRE] detector terminals used for earthing/grounding and shield wires connected to any earth/ground
terminal on the control panel. Twist the shield wire to avoid stray shield wires. If the detector does not have dedicated
shield wire terminals, shield wires connect to the 24vdc negative terminal [-] on both detector and panel.
A shielded and twisted 2 or 4 core cable is used to wire the MODBUS
terminals [D+ & D-). The shielding can be of 2 types: braided [mesh of thin
conducting wires] or foil (consisting of a thin sheet of metal covering the
twisted wires). One example of such cable is BELDEN 3082A. Any cable with
similar characteristics can be used to connect all the devices together.
If you are encountering noise or irregular problems with a bus link, the problem is likely related to grounding,
incorrect shielding or wiring mains power cables next to data cables.
The detector must be earthed/grounded for electrical safety and limit the effects of R/F & EMC interference!
Where cable runs may exceed 100 metres from one control panel –Contact your supplier!
Ensure the 120ohm termination resistance switch is turned on at each end of a cable run!

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 7
Creating a Detector Chain
Create a detector chain by connecting detectors in a parallel (daisy chain) method.
Any other way may cause issues or damage to the overall system. Resistor switches should be turned on at each end
of a chain –see section ‘120ohm Termination Resistance’.
Single Detector Chain from
Control Panel example.
Split Detector Chain from Control Panel example.
Reversing the [D+] and [D-] connections of any device can lead to the whole system to stop working owing to reverse
polarity found on the terminals. In order to avoid this problem, it is recommended that a cable of same colour should
be used to connect all [D+] terminals together and similarly cable of same colour to be used to connect all [D-]
terminals together.
The detector must be earthed/grounded for electrical safety and limit the effects of R/F & EMC interference!
Where cable runs may exceed 100 metres from one control panel –Contact your supplier!
Ensure the 120-ohm termination resistance switch is turned on at each end of a cable run!
Detector ID Switches
When wiring multiple detectors it is important to identify each detector installed for
the control panel to receive and display accurate data corresponding with the
correct device.
The ID configuration diagram is printed onto detector boards for quick
reference as shown opposite. All detectors are factory set to ID1.
We recommend a plan, map and/or marking the detector enclosures detailing ID and location!
ID Switches must be configured for each detector connected to receive and display accurate data!

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 8
120ohm Termination Resistance
Signal communication issues may occur where the bus length is too long, high baud rates are
used or signal reflections are occurring. To avoid this, terminating at each end of a chain
may help the quality of the data signal by turning on the 120-ohm terminal resistor switch.
If a split chain is used, terminate the last detector in each chain.
If a single chain is used, terminate the first device (Panel) and last device (Detector).
Split chain Single chain
Audible Alarm Switch
There is a switch on the detector board identified as [Buzzer On/Off].
The detector can be configured to have an audible alarm or not when gas levels reach the alarm
set points. The alarm will continuously sound –there are no provisions to silence the alarm, gas
levels must drop to a safe value for the alarm to stop.
Configuration Settings
On the circuit board you will find a [SETTINGS] dipswitch, when switched to on the screen will display the settings
menu –you can now configure your detection system.
Adjust Screen Brightness.
Press or slide the cursor up and down.
Change/Select Option
Press the blue option box or press and hold.
When the system is configured –turn the SETTINGS switch off and the system will restart.
To view, change and save settings, you must provide mains power!
Access to the interior of the detector, when carrying out any work, must be conducted by a competent person!
Before carrying out any work ensure local regulations and site procedures are followed!
Settings Options Explained
FUNCTION
OPTION
Explanation
BMS relay ON/OFF for-
- Gas
- Error
-Gas changes relay state with gas valve status only.
-Error changes relay state upon all alarm messages.
Auto Start-
- ON
- OFF
In the event of a power loss, the system will restart automatically when restored.

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 9
Factory Set Condition
FUNCTION
OPTION
Explanation
BMS relay ON/OFF for-
- Gas
-Gas changes relay state with gas valve status only.
Auto Start-
- OFF
In the event of a power loss, the system will require resetting manually.
Trouble Shooting
Fault.
Possible Cause/Correction.
Detector not responding
Incorrect wiring or screening of cables.
ID switches not properly configured.
Termination switches not set up correctly.
Service message
Detector requires service –contact supplier.
End of Life message
Detector requires replacement –contact supplier.
Operation
Initial Power Up (Commissioning)
On connecting mains power, the GDP2X panel will ‘warm up’ for approximately 60 seconds
–during this time the screen will display an ‘initialisation’ message while system searches for
detectors wired to the system.
We recommend all gas detection systems be commissioned by a competent/trained engineer to ensure
correct installation and operation!
Main Screen
When the system has finished initialising –the main screen will appear.
The main screen gives an overview of the status of each zone monitored by gas detectors and
if the gas line/supply is on (open) or off (shut).
Zone Status
Zone Status
System Condition
ZONE… OK
Gas levels are safe.
No error conditions.
ZONE… ATTENTION
Detector(s) are in pre-alarm status or
Detector(s) require service or
Detector gas sensor(s) end of life.
ZONE… DANGER
Dangerous gas levels have been detected or
Detector gas sensor fault has been detected or
Detector has lost its signal with the control panel.
See section: Alarm Messages.
ZONE… DISABLED
No detector signals received from the zone.
ZONE… -- X --
Detector not installed or Detector not configured correctly.

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 10
Zone Screens
Switch between zone screens by touching the relevant zone screen, i.e. [Z1] or [Z2].
Each zone can display up to 4 detectors and includes the status of alarms and gas levels.
a. ID: The detector identification number
b. Serial Number: The unique serial number for that detector.
c. Gas: The target gas that the detector is monitoring.
d. Status: The status of gas levels, errors and messages.
e. Value: The concentration value of gas monitored.
Alarm Messages
When a detector goes into alarm state, the control panel isolate the gas supply and the screen will display the ID of
the detector in alarm. If two or more detectors enter alarm status, the first detector to send an alarm signal to the
control panel will be shown in the top left hand corner of the screen. Press the relevant zone page for detector
information. There are three types of detector alarm.
Detector Alarm ID: #
Dangerous gas levels detected, the control panel will display an ‘Alarm’ message and detector ID.
Detector Fault ID: #
If the control panel receives a fault signal from a detector, your panel will show a ‘Fault’ message and detector ID.
Detector Lost ID: #
If a detector loses communication with the control panel, the screen will show a ‘Lost’ message.
External Panel Connection Alarms
Alarm messages prompted from external devices connected to relevant open/close terminals on the internal board
i.e. remote emergency shut off buttons are visible when in alarm state. The gas supply will isolate (be shut off) and no
gas detection details will be available. After the cause of alarm is rectified, press the reset button.
Alarms will isolate the gas supply/line!
The control panel must be reset following an alarm!
Investigate and rectify the issue before resetting the panel!
Pressing mute on the panel when in alarm will silence the audible alarm buzzer on the panel!

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 11
General Maintenance
Cleaning
Keep your system in good working order - follow these basic principles;
Remove any dust/debris from the outer enclosures regularly using a slightly damp cloth.
Never use detergents or solvents to clean your devices.
Never spray air fresheners, hair spray, paint or other aerosols near the devices.
Never paint devices. Paint will seal vents and interfere with the safety equipment.
Concentrations of alcohol found in many products may damage, deteriorate or affect the gas sensing elements
such as; wine; deodorants; stain removers and thinners. Other gases and substances to avoid are; corrosives
(i.e. chlorine & hydrogen chloride); alkali metals; basic or acidic compounds; silicones; tetraethyl lead;
halogens and halogenated compounds!
Manual Circuit Simulation Test
When the detector test button on a circuit board is pressed and held, the detector will simulate an
open circuit to ensure configured systems, outputs, alarms, indications and other external devices
operate as intended in response to gas. When the test button is released –the test sequence will
terminate and return to normal operation.
Access to the interior of the detector, when carrying out any work, must be conducted by a competent person!
This test does not check the gas-sensing element itself!
Bump Test (Gas Response Check)
What is a Bump Test?
Gas response checks are often referred to as a ‘bump test’. Bump tests are important to make sure a device is able to
detect a release of gas as early as possible. The aim of the bump test is to make sure a detector is working at its
optimum by briefly exposing the unit to a known concentration of the target gas that usually exceeds the highest
alarm point. If the detector goes into alarm and all signals/outputs activate, then the system is working safely. If the
system fails to operate as intended in an alarm state, the gas detector must not be used until a full inspection and
service has been conducted.
Why is it important?
A detector may visually appear in good working order, but its sensitivity can be inhibited by external factors. Dust,
humidity, temperature fluctuations, cleaning products, contaminants or sensor drift (ageing) can cause a decline in
sensitivity and eventual failure.
How often?
Regular bump tests are important to make sure the detector is able to detect a release of gas as early as possible, this
usually takes seconds (gas type dependant i.e. CO sensors will take over a minute) and is often completed alongside
a scheduled fire alarm test. The frequency should be determined following an appropriate risk assessment by the end
user. Remember, bump testing does not remove the need to have gas detectors inspected, calibrated and serviced
periodically by a competent person.

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 12
What do I need?
Contact your S&S Northern representative for details of suitable bump testing kits and gases. Kits usually consist of a
certified gas cylinder; flow control regulator, tube pipe and applicator cone. We recommend only using S&S Northern
calibration gas kits to ensure correct flow rates meet S&S Northern technical requirements. A bump testing gas is
usually a concentration mix that exceeds the highest alarm set-point.
See below for recommended gas concentrations for bump testing your detector.
Detector Type
Bump Test Gas
Response Time
CO - Carbon Monoxide
400 - 500ppm (balance in air).
<120s
NG - Methane
0.6 - 0.8% BV (balance in air)
<30s
LPG - Liquid Petroleum Gas
0.3 –0.4% BV (balance in air)
<30s
H - Hydrogen
5000 - 6000ppm (balance in air)
<30s
O2- Oxygen
15% (balance in Nitrogen).
<60s
All certified test gases supplied by S&S Northern are classified as non-flammable and non-toxic, however, they do
contain gas under pressure and may explode if heated to extreme temperatures and cause asphyxiation in high
concentrations.
How to perform a Bump Test?
1. Ensure you have the correct gas for the device type prior to application.
2. Screw and seal the regulator/valve into the gas cylinder outlet.
3. Once sealed, the regulator pressure gauge will indicate cylinder pressure.
4. Offer up the applicator hose/cone to the lower vents.
5. Open the valve/regulator to allow the gas to be delivered at a pre-set flow rate.
7. Wait for the device to enter alarm status and energise configured outputs/relays.
At this point…
9. Remove applicator hose/ cone and turn the gas cylinder regulator/valve off.
10. Wait for the device to return to normal.
11. Reset the system.
Record your test details. There is a provision for this in your control panel manual.
To increase reaction time, cover the escape vents at the top of the device.
Alternatively, enclose the device and apply gas i.e. in an air tight bag or container.
For more help and advice on bump testing –contact us.
Access to the interior of the detector, when carrying out any work, must be conducted by a competent person!
This test does not check the gas sensing element itself!
Always remove the regulator/valve from cylinder after use!
Always check cylinder pressure upon sealing valve –there may not be a sufficient amount of gas!
All S&S Northern cylinders will re-seal upon removal of the regulator/valve!
Always give at least five (5) minutes between testing the same unit or until gas has fully dispersed!
Always consider safety and use equipment in accordance with Safety Data Sheets!

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 13
Service & Field Calibration
Overview
Detectors are pre-calibrated at the time of manufacture, therefore a field calibration is only required periodically
(usually annually) to compensate for its sensitivity and accuracy that can be inhibited by external factors. Dust,
humidity, temperature fluctuations, cleaning products, contaminants or sensor drift (ageing) can cause a decline in
sensitivity, accuracy and eventual failure. Servicing and field calibration is important to prolong the operational life and
ensure the detector is able to detect a concentration of gas as accurately and as early as possible to optimise
protection. Typical accuracy of a detector is ± 10-20% of the standard field gas concentration.
Service and field calibration should coincide with the annual service message prompted on the detection system after
each year of service/operation. The annual timer for service will begin after 5 hours of continuous power irrespective
of whether the system is used intermittently. Depending on the application and environmental factors, field calibration
can be conducted at a higher frequency determined by the end user following an appropriate risk assessment but
must be executed by a competent person.
Contact your S&S Northern representative for details of suitable field calibration kits and gases to ensure any
equipment and flow rates meet S&S Northern technical requirements.
Annual Service Message
A service screen will intermittently flash every 30 seconds after one year of detector operation. The
detector will signal the control panel. The annual message reminder will begin after five (5) hours of
continuous power irrespective of whether the system is then powered intermittently. The detector will
still operate as intended during this time.
Service Mode
Access service mode by pressing the S&S Northern logo on the main screen only. The screen will display a service
prompt. Press Yes. (Note: All alarm signals/outputs will be inhibited for fifteen (15) minutes. Proceed to service and
re-calibrate detectors if required. Upon completion –exit service mode by pressing the ‘Exit’ button on screen. If you
need more time, exit and re-enable service mode. The system returns to a normal state after fifteen (15) minutes
automatically if the ‘exit’ button is not pressed.
When service mode is enabled, the control panel will ignore all alarm signals/outputs and the gas valve will
remain active!
The panel will return to a normal operational state after fifteen minutes automatically unless service mode is
disabled manually by pressing the [EXIT] button on screen!

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 14
Field Calibration
1. Carefully remove the detector cover to access the circuit board.
2. Ensure that service mode has been enabled on the control panel.
3. Short out the unmarked service headers for ~3s.
4. A calibration prompt will appear for a limited time on the detector screen.
5. Offer up the applicator hose/cone and cover the gas sensor fully.
6. Open the valve/regulator and deliver the gas at a pre-set flow rate.
7. Wait for a ‘successful’ message to appear on the detector screen.
8. Remove applicator hose/cone and turn the gas cylinder regulator/valve off.
9. After ~5s the detector will return to normal operation.
(Note: the annual service reminder is automatically reset)
10. Carefully replace the back cover.
See below for calibrated gas concentrations that must be used to calibrate your detector.
Detector Type
Calibration Gas
CO - Carbon Monoxide
120ppm (balance in air).
NG - Methane
0.5% BV (balance in air)
LPG - Liquid Petroleum Gas
0.2% BV (balance in air)
H - Hydrogen
4000ppm (balance in air)
O2- Oxygen
20.9% (balance in Nitrogen).
Gas sensor location, types and response times
The time for sensors to respond to their target gas will vary
on the type of gas sensing element. You should always refer
to the specification for information on sensor type and alarm
levels i.e. electro-mechanical sensors (such as CO and O2)
will react to its target gas slower than semi-conducting
sensor types (such as methane and LPG).
Failed Field Calibration
If field calibration is unsuccessful a screen text ‘Fail’ will appear.
After ~5s the detector will return to a normal state as it was pre-service but the service reminder
message will remain flashing. Check that the correct gas and concentration has been applied and
gas was applied before contacting your supplier.

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 15
Access to the interior of the detector, when carrying out any work, must be conducted by a competent person!
Before carrying out any work ensure local regulations and site procedures are followed!
Always give at least five (5) minutes between testing the same unit or when gas has fully dispersed!
Do not conduct calibration of sensors in conditions outside of any recommended ranges!
To recalibrate a detector, the following procedure and gases must be used!
Calibrated gases must be mixed in accordance with recognised standards such as EN 6142.
If a gas sensor is exposed to a concentration significantly above the measuring range, it should be
recalibrated as soon as possible afterwards!
Contact S&S Northern for more information.
End of Operational Life (EOL)
The typical life of a gas detector depends on its application and intended target gas, in addition, the operational life
can be prolonged if the system and equipment is installed and maintained in accordance the instructions stated within
this manual.
At the end of its predicted operational life –the detector will display an ‘End of Life’ screen. This
message indicates that the detector has reached its expected operational lifecycle and no gas
levels will be displayed. You must contact your supplier immediately for replacement.
The EOL is approximate from the first five (5) hours of continuous power!
The EOL will depend on the type of gas your detector is targeting and may vary depending on its application
and environmental conditions such as the frequency of exposure to the target gas, poisons or inhibitors!
Specification
General
Product:
GDP2X: Gas Detection Control Panel
Use:
Indoor, Safe Areas (not to be used in potentially explosive atmospheres)
Indicators (2.8” Touch Screen)
Main Zone Status. ID. Gas Type. Concentration Level. Measured Value. End of Life. Fault. Service.
Screen Brightness
Adjustable 0-100%
Mounting
Wall Mounting
Electrical
Max. Power Consumption
20W Max (Full Load)
Power Voltage Input Range
100-240vac
Gas Valve Output Range
100-240vac
I/Os
2x 24vdc Outputs (Detector / Strobe or Sounder)
3x Open/Close Switches (EM Stop / Heat Sensor / Fire Panel)
BMS Terminal
Volt Free (Normally Closed / Common / Normally Open) 3A Max
Relay(s)
2x 24vdc 8A (Latching) Configurable Normally open or Normally Closed (Switch)
Terminal Wire ratings
Copper 18AWG (0.75mm2) Min. 25 x screw terminals.
Fuse
3.15A
Construction
Dimensions (H x W x D)
140 x 190 x 62 mm/ 5.51 x 7.48 x 2.44”
Unit Weight (Approx.)
0.72kg / 25.4oz
Housing Material
Polylac - PA765
Environmental
Ingress Protection
IP65 (Pre-installation)
Storage Conditions
Dry. Cool. Flat
Operating Conditions
-10 ~ 50°C / 14 ~ 122°F 30 ~ 80% rh
Compliance
CE / UKCA
EN 61326-1 / BS EN IEC 61010-1

Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21 16
Installation Details
Please pass this manual to the system owner / user.
Date of Installation:
Installation Location:
Organisation:
Stamp/Signature of the installer:
We recommend all Merlin gas detection equipment be commissioned by a competent/trained engineer to ensure
correct installation and operation. The Merlin range of gas detectors are calibrated when manufactured, however, we
strongly recommend the detectors response and alarm signals are tested and validated once installed. This will
ensure the equipment performs as intended and is free from any unforeseen damage caused by transit/installation.
Every effort is made to ensure the accuracy of this document; however, S&S Northern can assume no responsibility
for any errors or omissions in this document or their consequences. S&S Northern 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, please contact S&S Northern using the
contact details given below.
S&S Northern Head Office
Tel: [phone]
Fax: [phone]
www.snsnorthern.com
[e-mail]
South East Division
Tel: [phone]
Fax: [phone]
[email protected]om
S&S Northern is the owner of this document and reserves all rights of modification without prior notice.