Duomo SGM595 User manual

SGM595GasSensor
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FEATURES
■Natural Gas or Propane detection sensor
■Catalytic Sensor Technology
■4-20mA signal sensor output
■Automatic Calibration
■Sintered Head
■IP55 Protective Rating
■CE Certied and approved to EN50194
■2 Year Guarantee - 3 Year by Registering at duomo.co.uk
APPLICATION
Duomo is recognised within the gas industry for providing a
comprehensive range of low cost, high reliability gas detection for
many applications. We have installed and commissioned natural gas
and carbon monoxide sensors in applications such as boiler rooms,
kitchens, car parks, factories and shopping centres. The SGM595
is the gas sensor used with the complete range of Duomo detector
panels. All Duomo products are manufactured to meet relevant
European Normatives and proposals for explosive and toxic gases.
OPERATION
When the SGM595 senses the presence of gas it sends a 4 - 20mA
signal to the detector proportional to the level of gas. The detector
then operates a prealarm relay - used for remote sirens or visual
indicators if the level of gas continues to rise then the main alarm
relay is activated to break the electrical supply to a safety shut o󰀨
valve, and is xed at 20% LEL of Natural Gas or LPG.
The SGM595 microprocessor conducts both self diagnostics and
automatically calibrates the sensor when ambient conditions vary,
thus avoiding false alarms.
SGM595 Natural Gas / Propane Sensor
4-20mA
IP55 Propane
Natural
Gas SPECIFICATION
Power
Power Supply 12-24V DC ± 10% from controller
Power Consumption 80mA at 13.8V
Relay contact range
Technical Specication
Gas(es) Detected L.P.G or Natural Gas
Sensor Technology Catalytic
Dimensions Width 76mm |Height 176mm |Depth 57mm
LED indicator Green: Power ON
Mounting Wall Mounted
Output Signal 4-20mA
Device Precision 1% FS
Clean Air Shift < ± 3% LEL
Reaction Time <10 seconds
Autosetting Yes
Working Temperature -10°C to 40°C
Functioning Humidity
Protective Rating IP55
Perhipheral Specication
Maximum Sensor Distance 100m
Cable Diameter for Sensors 1mm2CSA
(Screened and earthed at the controller end)
Compatibility
Controller Compatibility All Conventional Duomo Controllers
(Not Addressable BXI32)
Calibration Gas Compatibility Duomo test Gases
Approvals, Certications and Guarantee
Approvals CE Certication: No.96125
Guarantee 2 Year as Standard
3 Year by Registering at www.duomo.co.uk
Expected Lifespan 5 years

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SGM595GasSensor Precautions and Maintenence
Check the integrity of the unit after having removed it from the box.
Check that the data written on the box correspond to the type of gas used.
When doing the electrical connections, follow the drawing closely.
Any use of the detector for purposes other than the intended one is considered improper and as a result of which Duomo
(UK) therefore disclaims any responsibility for possible damages caused to people, animals or objects.
Do not allow the sensor to become wet.
The product is not waterproof either when immersed in water or exposed to high levels of humidity.
Every six months must perform a function check of the sensor and connected controller. Suitable test gas must be used
to avoid damaging the sensor. Disabling the sensor or the controller must be carried out by a suitably trained technician.
Every year a more accurate check must be performed by qualied personnel. Please call Duomo (UK) on 01905 797989
Overall Dimensions (mm)
Important Notes
IMPORTANT: Assembly / maintenance of the appliance must be carried out by qualied personnel and in
accordance with applicable laws and regulations.
The manufacturer assumes no responsibility for the use of products that have to comply with particular
environmental and / or installation standards.
IMPORTANT: Before connecting the equipment, it is recommended that you read the instruction manual
carefully and keep it for future reference.
Electrical Connections
IMPORTANT: Before connecting to the mains power, ensure the voltage is correct. Carefully follow the
instructions and the connections according to Regulations in force, keeping in mind that the signal cables should
be laid separate from the power cables.
57mm76mm

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3 2 1 Connecting Terminal
Power ON LED
Diagnostic port
Connections and LED indicator
Important Notes
IMPORTANT: Assembly / maintenance of the appliance must be carried out by qualied personnel and in
accordance with applicable laws and regulations.
The manufacturer assumes no responsibility for the use of products that have to comply with particular
environmental and / or installation standards.
IMPORTANT: Before connecting the equipment, it is recommended that you read the instruction manual
carefully and keep it for future reference.
Electrical Connections
IMPORTANT: Before connecting to the mains power, ensure the voltage is correct. Carefully follow the
instructions and the connections according to Regulations in force, keeping in mind that the signal cables should
be laid separate from the power cables.
CONNECTING TERMINAL
1. Positive Suplly Voltage
2. 0V
3. Return Sensor Voltage
POWER ON LED
This LED illuminates Green when power is ON and the sensor has a power
supply from the controller.
Flashing red indicates gas is being detected.
Constant red indicates alarm state.
Constant Amber indicates fault condition.
DIAGNOSTIC PORT
This can be connected to a A hand-held datalogger that can printout
information about the sensor (serial number, powering up information,
sensor condition, alarm activations, expected lifespan, auto adjusts made
and the preset calibration state.
Tuning the Sensor to the Installation
Upon completion of the install measure the DC voltage between terminals 2
and 3 in the sensor plug. This is located at the top right hand corner of the
SGM595 printed circuit board. If the reading is not between 0.8 - 0.9vDC you
will need to trim JP1.
JP1 is located on the PCB to the left of the PCB lower securing screw. Using
a wire link briey short the two terminals of JP1 until the power green LED
ashes. When the power green LED ashes remove the link. Once the LED has
stopped ashing recheck the voltage between terminals 2 and 3 on the sensor
plug. If the voltage is still outside 0.8-0.9vDC conduct the procedure again.

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BX150 GS100M GS300M GS300Mc BX444Mc BX316
Channels 1 1 3 3 4 2
Maximum Sensors 1 1 3 3 4 16
Addressable - - - - - -
Display ---8888
Colour Change
Digital Display
8888
Colour Change
Digital Display
8888
Illuminated
Digital Display
Mounting Panel Wall & Panel Wall & Panel Wall & Panel Wall & Panel Wall
Power 12V or 230V 230V 230V 230V 230V 230V
4-20mA Input
Self Diagnostic
Manual Test
Internal Alarm
Emergency Stop Function ---
Alarm Stages Pre Alarm
Main Alarm
1st Alarm
2nd Alarm
Main Alarm
1st Alarm
2nd Alarm
Main Alarm
1st Alarm
2nd Alarm
Main Alarm
1st Alarm
2nd Alarm
Main Alarm
Pre Alarm
Main Alarm
O2Monitoring ---
Positive Safety
IP Rating IP42 IP44 IP44 IP44 IP44 IP65
Extended Guarantee * 3 Year 3 Year 3 Year 3 Year 3 Year 3 Year
Compatible Controllers
Please consult the below table for a list of compatible controllers along with a comparison of key features and options
available.

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Sensor Orientation
The sensors must be mounted as shown below with the sintered head pointing vertically down.
Sensor Positioning
The SGM595 sensor should be mounted in accordance
with certain considerations. Do not position next
to burners, heaters or ovens where temperatures
above the room ambient may be experienced. It is, if
possible, better to mount the sensors on the opposite
wall. This is, of course, dependant on the size of the
protected area.
LPG is heavier than air, therefore the SGM595 sensor
should be mounted 30cm from the lowest point on
oor of the protected area. Natural Gas is lighter than
air and the SGM595 should be mounted 30cm from
the highest point from ceiling of the protected area.
If you require assistance regarding locating sensors
please call our Droitwich factory on [phone]
or email us: [email protected]
Important Notes
Always check the wiring before powering up the system.
When replacing sensors never seperate a sensing head from its PCB. The sensor will have been calibrated using this
particular board and therefore will not function correctly with any other.
Do not test this sensor with anything other than Duomo test gas. Concentrations above this will damage the sensor and
shorten sensor life.
The installation of this gas sensor does not release the user from observing all the regulations concerning the characteristics
of the installation and use of gas appliance, the ventalation of the protected environment and the removal of the products
of combustion. Duomo (UK) will not be held responsible or liable for any damage caused to people, property or animals
resulting from incorrect connection, installation or application of this gas sensor.
To ensure correct function after installation Duomo provide a commissioning service using calibrated test gases. For this
service call [phone].

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Still experiencing difficulties?
If you have made the checks above and are still experiencing di󰀨culties then please call Duomo (UK) Ltd on
[phone] for technical assistance.
Troubleshooting
The Problem The Solution
The sensor does not power up Check that the 12/24 VDC power is present, and that positive and negative polarity has not been
inverted.
This is a working document and will be updated as new troubleshooting and FAQs become apparent. If your issue is not listed here please
call Duomo (UK) on 01905 797989 and inform us so we can list your issue and associated solution here.
In case of alarm
Extinguish any naked ames.
Do not switch lights or electrical devices on or o.
Open all windows and door to increase ventalation.
• If the ALARM LED is o the levels of gas have dropped. A responsible, qualied person is now safe to nd the cause of
the alarm.
• If the alarm sound reamins constant and the cause is not evident or not possible to eliminate turn o the emergency
isolation valves to the area and contact your gas provider emergency line. They will advise accordingly.

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Commisioning
It is strongly recommended that this SGM595 gas sensor and connected detection system is commissioned and serviced
by Duomo Commissioning Engineers or engineers approved by Duomo. A quotation for commissioning or service will be
provided upon request.
Email site details and preferred date for commissioning or service to [email protected] to the Duomo Service Department.
Or call [phone]
The benets of this equipment being commissioned by Duomo are:
• On board spares - If for whatever reason this equipment doesn't function correctly Duomo engineers will have spares
on board to ensure that the commissioning is successful.
• A Duomo Commissioning Certicate is provided - A certicate from the original maufacturer ensures that the commisioning
or servicing carried out is at a high professional standard by a competent and qualied service engineer.
It is prudent to make electrical connection to the detector terminal plus when withdrawn and leave the plug o the detector
so that the Duomo Engineer is the rst to power up the unit on site. This allows wiring to be checked prior to commissioning
and avoids damage due to incorrect connection. Guarantees for this product will become void if damage is caused by the
installer.
Maintenence
This sensor must be function checked as described above using calibrated test gas every 6 months.
To arrange for a Duomo engineer to conduct this work or to arrange a service contract please call [phone].
Commisioning, Service & Maintenence
Notes

www.duomo.co.uk
[e-mail]
01905 797989
5 The Furlong, Berry Hill Industrial Estate, Droitwich, Worcestershire, WR9 9AH
@DuomoUK
linkedin.com/company duomo-uk
SGM595 11032021 rev2
This document is protected by copyright ©
No changes by others are permitted without prior authorisation by Duomo (UK) Ltd.
Duomo (UK) Ltd reserve the right to modify and revise this datasheet without notication.
GAS SAFETY CONTROLS