Duomo Gs300m User manual

GS300M GasDetection Controller

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GS300M 3 Channel Gas Detection Controller

FEATURES

■Three channel protection

■230VAC supply

■Wall or panel mounted

■Positive safety option

■Detection of Toxic 0-300ppm / Explosive Gas(es)

0-20%LEL

■4-20mA signal sensor input

■3 alarm stages - 1st & 2nd pre-alarm and main alarm

■IP44 protective rating

■CE certied and approved to EN 61010-1, EN 50270,

EN 50271, EN 45544-3, EN 60079-29-1

■2 year guarantee - 3 year by registering at duomo.co.uk

OVERVIEW

The GS300M is a 230V three channel and sensor wall or panel

mounted gas detection controller. It can be connected to toxic and

explosive sensors. An LED display indicates sensor status and

faults.

If the remote sensor senses the presence of gas, it sends a

proportional 4-20mA signal back to the GS300M. When the rst

alarm level is reached the pre-alarm relay is activated (See Alarm

Settings). If the level continues to rise the main alarm relay will be

energised.

For explosive or toxic gases, the electrical supply to the safety shut

o󰀨 valve is broken when the main alarm threshold is reached. A

general alarm is sounded.

Should the controller enter fault condition the safety shut o󰀨 valve

closes to fail safe. A self-diagnostic feature looks for return sensor

voltage and ensures correct functionality.

The GS300M controller is compatible with all the Duomo

conventional sensors.

SPECIFICATION

Power

Power Supply 230VAC 50Hz ± 10%

Secondary Battery 12VDC ± 10% Max 2.2Ah

Battery Charger Charger Capacity 2.2Ah

Power Consumption 11W Maximum @ 13.8V

Relay Contact Range 10A resistive

Alarm Settings

Pre-Alarm No.1 8% LEL / 120ppm

Pre-Alarm No.2 13% LEL / 200ppm

Main Alarm Fixed at 20% LEL / 300ppm

Sensor Fault Short circuit, interruption, sensor deterioration

Technical Specication

Dimensions Width 144mm |Height 144mm |Depth 110mm

Display N/A

Mounting Wall or panel mounted

Input Signal 4-20mA

Device Precision 1% FS

Reaction Time <10 seconds

Working Temperature -10°C to 40°C

Start-up Self-Diagnostic Delay 90 seconds

Protective Rating IP44

Conguration

Positive Safety Yes (ON/OFF)

Main Alarm Relay Actuation Yes (Latching/Temporary Alarm)

Gas Type Selection Yes (Toxic/Explosive)

Timed Sensor Test Facility No

Emergency Stop Connections No

O2Compatibility as Standard No

Perhipheral Specication

No. of Remote Sensors 1-3

Maximum Sensor Distance 100m

Cable Diameter for Sensors 1mm2CSA

(Screened and earthed at the controller end)

Compatibility

Sensor Compatibility All Duomo Sensors

Approvals, Certications and Guarantee

Approvals EN 61010-1, EN 50270, EN 50271, EN 45544-3,

EN 60079-29-1

Guarantee 2 year as standard

3 year by registering at www.duomo.co.uk

Channel

Conventional

4-20mA

IP44

Positive

Safety

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GS300M GasDetection Controller Overview

The GS300M is a wall or panel mounted microprocessor based gas detector control unit. The GS300M can be con-

gured to meet customer requirements. The following parameters can be changed using on board DIP switches: (See

Conguring the GS300M)

• Number of sensors from 1 to 3

• Type of gas to be sensed (explosive or toxic)

• Positive Safety Option (on or o󰀨)

• Main alarm relay action (permanent or auto-reset)

The GS300M has one fault relay that breaks the connection in case of system failure. This can be used to constant-

ly monitor the operation of the controller remotely (eg through a BMS). The relay driving techonogy (de-energized

when triggered) will ensure a prompt indication even in case of mains power failure.

The GS300M has two plug in terminal blocks. One is for the incoming mains supply and alarm circuit wiring and the

second is for connecting the sensor wiring.

This reduces the chance of incorrect site wiring. The front panel has two overload lights which indicate when a short

circuit or an overload has occurred on the sensor wiring.

144 77

108

144

140

141

Cutout

Dimensions (mm)

GS300M

BATTERY

TEST

ALARM FAULT

GAS

ALARM FAULT

GAS

ALARM FAULT

GAS

13 20

% LEL

ppm

% LEL

ppm

% LEL

ppm

200 300180

13 208

200 300180

13 208

200 300180

BATTERY OVERLOAD

SENSORS OVERLOAD

MAIN ALARM

1 PRE ALARM

1 ZONE

2 PRE ALARM

2 ZONE 3 ZONE

Mounting Bracket

Control panel

Mounting the GS300M

Overall Dimensions (mm)

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1 2

4 5NPh 6 7 8 9 10 11 12 4 5321 6 7

TEST

BATTERY

ALARM FAULT

GAS

ALARM FAULT

GAS

ALARM FAULT

GAS

13 20 % LEL

ppm

% LEL

ppm

% LEL

ppm

200 300180

13 208

200 300180

13 208

200 300180

BATTERY OVERLOAD

SENSORS OVERLOAD

MAIN ALARM

1 PRE ALARM

1 ZONE

2 PRE ALARM

2 ZONE 3 ZONE

GS300M

GS300M Fascia & PCB Layout

No Description Purpose & Functionality

1ON LED illuminates when supply voltage is applied.

LED ashes during self diagnosis start up.

2 BATTERY This LED illuminates when the GS300M is being poered by standby battery

3 BATTERY OVERLOAD LED Illuminated to indicate incorrect battery connection or high consumption during charging phase.

4SENSORS OVERLOAD LED Illuminated to indicate short circuit or overload on sensor circuitry.

5ALARM Indicates alarm status (explosive or toxix levels have been reached)

6TOXIC / EXPLOSIVE Toxic (Skull) LED illuminates when DIP switch for sensor is in CO (Toxic) position

Explosive LED illuminates when DIP switch for sensor is in GAS (Explosive) position

7PRE ALARM LEDS Indicate level of gas sensed (8 - 13 - 20% LEL / 120 - 200 - 300ppm)

8 RESET When pressed resets the detector after an alarm or sensor fault condition.

9TEST

When pressed checks the sequence and function of GS300M.

Press and hold to initiate a full function test, release once controller is in alarm state required

Will eventually activate all relays and their associated outputs.

10 1st PRE ALARM Illuminates at 8% LEL (Explosive) or 120ppm (Toxic) gas concentration:

LED illuminates and the Pre Alarm relay 1 is actuated.

11 2nd PRE ALARM Illuminates at 13% LEL (Explosive) or 200ppm (Toxic) gas concentration:

LED illuminates and the Pre Alarm relay 2 is actuated.

12 MAIN ALARM Illuminates at 20% LEL (Explosive) or 300ppm (Toxic) gas concentration:

LED illuminates and the Main Alarm relay is actuated.

13 FAULT Indicates short circuit, sensor fault, loss of signal or incorrect sensor connection.

14 Supply & Relay Terminals Electrical supply and relay connections. (See Wiring Schematic for connection instructions).

15 Sensor switches Used to enable or disable a sensor on a zone (ON/OFF) or determine type of gas to be detected (Toxic/

Explosive) - (See Conguring the GS300M section for setting instructions).

16 Positive Safety switch Positive Safety switch (See Conguring the GS300M section for setting instructions).

17 Main Alarm Relay actuation Determines if Main Alarm relay remains in position even if gas levels drop below alarm threshold.

(See Conguring the GS300M section for setting instructions).

18 Sensor/ Battery Terminals Sensor and Battery (if tted) terminals (See Wiring Schematic for connection instructions).

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Configuring the GS300M

The GS300M has three pairs of DIP switches on the PCB. The left switch on rst three double switches is used to enable

or disable the sensor for that respective zone. The right switch is used to congure the controller to indicate whether the

connected sensor is for explosive or toxic gas.

The GS300M can be congured to provide several modes of operation. The congurable parameters are:

Left switch on any of the 1st 3 double DIP switches

The GS300M will not look for a sensor on a given zone if the switch is moved to the OFF position. It

is not necessary to remove the return cable from the sensor.

Example shows Zone 1 On, Zone 2 On and Zone 3 O.

Left switch on 4th double DIP switch

Positive safety determines the condition of the main alarm relay and hence the operation of the gas

valve. When it is 'ON' the relay is in a normally open state. When it is 'OFF' the relay is in a normally

closed state. NOTE: This a󰀨ects how the gas valve operates and means that you may need to

change how it is wired to the GS300M. Example shows Positive Safety on

Right switch on any of the 1st 3 double DIP switches

Toxic or explosive levels. These are labelled as GAS or CO on PCB. The symbols on the front fascia

of the detector are EN standard symbols and refer to any explosive or toxic gas. If toxic gas, e.g.

carbon monoxide is to be sensed on a given zone move the switch to the CO position. If explosive,

e.g. natural gas, LPG, hydrogen etc. move the switch to the GAS position.

Example shows Zone 1 Explosive, Zone 2 Toxic, Zone 3 Explosive,

Right switch on 4th double DIP switch

Main Alarm relay actuation method. This can be congured to provide either a permanent or a

temporary alarm operation. When the main alarm is actuated in an alarm condition if the switch is in

the 'C' position, the relay will remain in this position for the entire period in which the gas concentration

remains above. If the switch is in the 'I' position the main alarm relay will actuate for 5 seconds and

then will return to the running condition.The indication on the panel fascia and the audible alarm will

still indicate main alarm. This mode of operation is used when using manual reset gas valves and

battery back-up systems for extending standby battery life. Example shows detector congured

for a permanent main alarm

Gas Sensed

Main Alarm Relay

Time

Gas Sensed

Main Alarm Relay

Main Alarm switch in ’l’ position

Time

Main Alarm switch in ’C’ position

5 seconds

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Note:

Connections when Positive Safety is o

Note:

Connections when Positive Safety is on

*1mm2 CSA cable only

Power Supply

230V AC

Lamp

GS300M wiring schematic

Sensor Installation

The sensors must be mounted as shown below with the

sintered head pointing vertically down. 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.

Electrical Installation

The GS300M is a safety device designed to give audible

alarms and automatically provide latched electrical isolation

of associated gas safety shut o󰀨 valves in the event of a gas

leak or build up of toxic gases.

The sensors can be located up to 100m from the gas detector.

Cable size should be 1mm2CSA. If the sensor cables are

run separately in specic conduit it is not essential to use

screened cable but if the cables are routed through conduit

or trunking containing other wiring the use of screened cable

is advisable. The wiring should be performed by a qualied

person in accordance with current regulations. The plug-in

terminal rail makes installation easy and quick. Do not mount

close to any heat source or in an area where moisture is

likely to e󰀨ect operation. The IP rating of this unit is IP44.

Sensors should be positioned as shown below.

If you require any guidance on this please call Duomo

technical support on +44 1905 797989.

Important Notes

Always check the wiring before powering up the system.

Do not test this sensor with anything other than Duomo test

gas (See 'GS300M Operation' section for further information).

Concentrations above this will damage the sensor and

shorten sensor life.

The installation of this gas detector does not release

the user from observing all the regulations concerning

the characteristics of the installation and the use

of gas appliances; the ventilation of the protected

environment and the removal of products of combustion.

Duomo 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 detector. To

ensure correct function after installation Duomo provide a

commissioning service using calibrated test gases. For this

service call +44 1905 797989.

Sensor range for use with GS300M

HCF100 Refrigerant Gas Sensor

CO233A CO Sensor

SGM595 Methane or LPG Sensor

CO100AR CO Sensor

Technical Specication

Gas(es) Detected Carbon Monoxide

Dimensions Width 100mm |Height 100mm |Depth 60mm

Display 6 Colour Digital Display

Sensor Technology Electrochemical

Settings Preset to TWA and STEL Standards

Output Signal 4-20mA

Sensor range 0-300ppm

Working Temperature -20°C to +50°C

Autosetting Yes

Protective Rating IP65

Approvals EN50270 & EN45544-1-3 Compliant

Technical Specication

Gas(es) Detected Freons (Inc R134A, R404A, R407C, R410A)

Dimensions Width 76mm |Height 150mm |Depth 58mm

Display N/A

Sensor Technology Semiconductor

Settings N/A

Output Signal 4-20mA

Sensor range 0-300ppm

Working Temperature -10°C to +60°C

Autosetting Yes

Protective Rating IP55

Approvals EN50270 & EN45544-1-3 Compliant

Technical Specication

Gas(es) Detected Carbon Monoxide

Dimensions Width 100mm |Height 100mm |Depth 60mm

Display N/A

Sensor Technology Electrochemical

Settings Preset to TWA and STEL Standards

Output Signal 4-20mA

Sensor range 0-300ppm

Working Temperature -15°C to +40°C

Autosetting Yes

Protective Rating IP55 (Enclosure) IP65 (Sintered Head)

Approvals BS EN50291 Compliant

Technical Specication

Gas(es) Detected Methane and LPG

Dimensions Width 73mm |Height 108mm |Depth 57mm

Display N/A

Sensor Technology Catalytic

Settings N/A

Output Signal 4-20mA

Sensor range 5% to 20% LEL

Working Temperature -10°C to +60°C

Autosetting Yes

Protective Rating IP55

Approvals EN50194 Compliant

IP65

IP55

4-20mA

8888

Colour Change

Digital Display

IP55 IP55 Propane

Freons Methane

CO CO

Sensor range for use with GS300M

SGF104 Oxygen Sensor

SG895 ATEX Sensor SG500 Methane or LPG Sensor

Technical Specication

Gas(es) Detected Methane, LPG, Ammonia, Hydrogen, Acetylene, Gasoline,

Methanol, Ethanol, White Spirit, Acetone, Hexane,

Ethyl Acetate, Toluene

Dimensions Width 100mm |Height 133mm |Depth 70mm

Sensor Technology Pellistor

Settings 0-20% LEL (0-300ppm for Carbon Monoxide)

Output Signal 4-20mA

Sensor range 0 - 100% of LEL or di󰀨. in ppm

Working Temperature -10°C to +70°C

Autosetting Yes

Protective Rating IP65

Approvals ATEX RATED EN60079-0, EN60079-1, EN61241-0 &

EN61241-1 Compliance

Technical Specication

Gas(es) Detected Oxygen

Dimensions Width 100mm |Height 100mm |Depth 60mm

Sensor Technology Optical (Fluorescence based)

Settings 19.5 or 18.5% of O2(depletion), 22.5, 23.5% (excess)

Output Signal 4-20mA

Sensor range 0-25%

Working Temperature -30°C to +60°C

Autosetting Yes

Protective Rating IP64

Approvals EN50104 and EN50270 Compliant

Technical Specication

Gas(es) Detected Methane or LPG

Dimensions Width 110mm |Height 50mm |Depth 35mm

Sensor Technology Catalytic

Settings N/A

Output Signal 4-20mA

Sensor range 0-20% LEL

Working Temperature -0°C to +40°C

Autosetting No

Protective Rating IP30 (Enclosure)

Approvals N/A

Calibration Gas

Available in 12L & 110L Cannisters

Valves and other spares also availa-

ble

4-20mA4-20mA

4-20mA

IP64

IP65 IP30

10+

Gases

LPG

Methane

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GS300M Operation test proceedure

Before powering up the GS300M once again check that all electrical connections are correct.

1Apply 230VAC supply to the Ph and N terminals. Ensure that the correct fuse is used in the supply (3A or 5A max)

2All of the LEDs on the fascia will illuminate in sequence which allows an oppurtunity to visually check the functionality of all the LEDs.

This process takes approximately 20 seconds.

The ON LED will remain ashing for 90 seconds. During this period the GS300M is in warm up phase. Gas detection functionality is not

available during this period.

When the ON LED remains stable the GS300M is in full operation mode.

Please note: The GS300M is not in override, the following step will activate relay outputs when Alarm level readings are exceeded.

By pressing and holding the TEST button a function test can be performed for all Pre-Alarm and Main Alarm relays together with LEDs

and internal buzzer. If a full test is required then hold the TEST button until 300ppm or 20%LEL reading is exceeded to activate all

relays.

The sequence will be:

(a) At 8% LEL/ 120ppm reading - Pre-Alarm no.1 relay actuated, 1st ALARM LED illuminates and Terminal 6 and 7 will be connected.

(b) At 13% LEL/ 200ppm reading - 1st ALARM outputs listed in step (a) are all deactivated (Relay, LED and Terminal connections) .

Pre-Alarm no.2 relay actuated, 2nd ALARM LED illuminates and Terminal 8 and 9 will be connected.

(c) At 20% LEL/ 300ppm reading - The Main Alarm relay is actuated, MAIN ALARM LED illuminates and Terminal 10 and 11 will be

connected and terminals 10 and 12 will be broken and the audible alarm will continue to sound (With Positive Safety On terminals 10

and 11 will be broken and terminals 10 and 12 will be connected).

The relevant Alarm LED will illuminate to show which zones are in alarm.

By releasing the TEST button the LED will go out and the audible alarm will stop. If latched alarm function on the main relay is

congured this will remain on until the RESET button is pressed.

In order to conduct a full function test and calibration it is essential to use Duomo (UK) Ltd or equivalent calibrated test gas. The

maximum concentrations are:

40% Methane (CH4) in Air

350ppm Carbon Monoxide (CO)

0.85% (MOL) for Propane

Any higher can reduce sensor lifespan. Note: NEVER TEST WITH NEAT GAS. THIS WILL POISON THE SENSOR.

To simulate a sensor fault and test associated outputs:

Disconnect the sensor plug The detector will go into FAULT ALARM and the sensor fault relay will be actuated as well as the

FAULT LED. This will open the contacts between terminals 4 and 5 and open the contacts between terminals 10 and 12 (Main

Alarm relay). When the plug is reconnected the detector can be reset by pressing the RESET button.

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Troubleshooting

The Problem The Solution

No light are illuminated on the fascia of the

detector

Check that the electrical supply is reaching the device and that the plug in terminal rail is pushed

into place.

One or all of the sensor fault lights are

illuminated

Check that the plug is inserted correctly.

Check that the sensor wiring is correctly terminated at both the detector and the sensor. Check that

12V DC is present at the sensor. The green LED on the sensor should be illuminated.

By pressing the TEST button on the detector fascia it is possible to check the e󰀩ciency of the

device and if the sensors have been connected correctly.

Sensor fault continues to alarm Check the sensor wiring. If the red Overload LED is illuminated then a short circuit or overload has

occured on the sensor or connecting cable.

The detector is subject to repeated alarms Ensure that there is not an occasional gas leak. This may be due to a valve or joint which leaks

under pressure.

The detector is in main alarm condition and

the main gas valve is not closing

Check that the connections are correct and that power is supplied to the valve i.e. The valve is not

stuck in the open position. The function of the alarm relays both the Pre-Alarm and the Main Alarm

can be checked by pressing the TEST button on the detector fascia. Check that the main alarm

action is congured for a latching alarm.

(Switch 2 on 5th DIP switch - See Conguring the GS300M)

There is no supply to the solenoid valve

The Main Alarm relay is a volt free contact, therfore you must connect the live supply to the

common of the main alarm relay contacts terminal 10.

A supply will then come from terminal 12 to the solenoid valve.

The sensor is connected but no LED is lit on

the front fascia

Check that the DIP switch is set to the ON position for that sensor

(Switch 1 on one of the rst three DIP switches - See Conguring the GS300M)

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 valaves to the area and

contact your gas provider emergency line. They will advise accordingly.

Still experiencing difficulties?

If you have made the checks above and are still experiencing di󰀨culties then please call Duomo (UK) Ltd on

+441905 797989 for technical assistance.

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Commisioning

It is strongly recommended that this GS300M gas 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 +44 1905 797989

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