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Gas Interlock Systems (BS6173) (IGEM/UP/19)

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Gas Interlock Systems (BS6173:2009)

What do i need for a compliant gas interlock system?

Gas Interlock Systems are a compulsory requirement for the majority of commercial kitchens, they are designed to shut off the gas supply to the kitchen in the event of a fan failure. They are also used to ensure that the air flow rates achieved by commercial kitchen extract systems meet the minimum standards as set out by DW/172, the specification of kitchen ventilation systems.

Gas interlock systems operate by monitoring the operation of the fan or fans within the ventilation system, this can be achieved by two methods. Firstly a differential air pressure switch can be used, this senses the difference in air pressure either side of the fan (either intake or extract), the pressure switch can be set a different levels of sensitivity to achieve a shut off at the required level of air throughput. Alternatively an electrical current sensor can be used instead of an air pressure switch, this monitors the electrical current to the fan to achieve the same objective. Current monitors are available as a separate element, or in the case of some gas interlock control panels are built in.

The air pressure switch or current monitor is then wired back to the gas interlock control panel, various panels are available to suit different requirements. At their most basic level panels monitor two fans (usually one intake and one extract), and support at least one remote emergency stop button and one gas solenoid valve. More advanced panels can support multiple intake and extract fans simultaneously, along with supporting fire alarm and shutter systems and gas proving systems (where gas equipment does not have flame failure).

The gas interlock panel is connected to a suitably sized normally closed gas solenoid valve, this ensures that the gas supply to the kitchen is off at all times except when the kitchen extract system is operating correctly. Gas solenoid valves are available ito fit most sizes of pipe, however it is necessary to consider the pipe material as for example black iron pipework has a smaller bore than measuring the pipe exterior. Where the gas interlock control panel is not located on the emergency exit it is also necessary to located an emergency stop on the escape route.

In order to connect the system you will require a 13A switched spur, this will provide power for the gas interlock control panel, all other elements are then wired from the panel in low voltage cabling. The installation of the system should be completed by a suitable qualified electrician with the fitting of the gas solenoid valve into the pipework being undertaken by a Gas Safe Register engineer.

For a basic system to operate on a standard commercial kitchen extract to comply with BS6173:2009 and IGEM/UP/19 you will require a gas interlock control panel, one differential air pressure switch (two where an intake fan is also present), a correctly sized gas solenoid valve and a remote emergency stop. You can purchase these items from the products listed below. For a more advanced system you can use a panel with a built in current monitoring system meaning that you do not need air pressure switches.

For more advice, and for further information on calculating the correct air flow rates using DW/172 please contact us.
Intelligas 100 CS Gas Interlock Control Panel (Current Sensor)

Intelligas 100 CS Gas Interlock Control Panel (Current Sensor)

Intelligas 100 CS Gas Interlock Control Panel (Current Sensor)

Price: 200.00
(240.00 Including VAT at 20%)

The Intelligas 100 series is the simplest, most economical system that we offer. It meets the requirements of BS 6173, and it's easy to install - even if you're not technically qualified. It's carefully designed and clearly labelled, and if you're having problems our 24-hour helpline is moments away.

Standalone control panel with two onboard current sensors - with this panel there is no need for separate air pressure switches, comprehensive fan, fire & emergency stop status indication, audible signal for failure & system ready, wipe clean fascia, on board emergency stop button, all connections on front panel, leaving the complete enclosure for cable entry, clearly-marked terminals for easy installation, fire alarm interlock, additional emergency stop buttons can be connected directly to the PCB, H 190 x W120 x D60

Onboard current sensors (up to 3kw) for both supply and extract fans
Full fan and gas valve status indication
Easy wipe clean fascia
On board emergency stop button (that doubles as a system on / off switch)
All connections on front panel, leaving the complete enclosure for cable entry
Clearly-marked terminals for easy installation
Fire alarm interlock
One additional emergency stop button can be connected directly to the PCB
Two year back to base guarantee

 

S&S Northern Merlin CT1200S Gas Interlock Control Panel

S&S Northern Merlin CT1200S Gas Interlock Control Panel

S&S Northern Merlin CT1200S Gas Interlock Control Panel

Price: 201.00
(241.20 Including VAT at 20%)

The Merlin CT1200S ventilation interlock system is designed specifically for use in commercial kitchens to meet BS6173. This panel is to be used when the kitchen appliances do have flame failure devices, therefore Gas proving is not a requirement
The Merlin CT1200S acts as an interlock between the ventilation system and the gas solenoid valve. This system can work in conjunction with both external current monitors and air pressure differential switches in order to interlock with up to 2 fans

Allows compliance with BS6173 for commercial kitchens
To be used when all appliances have flame failure devices
Interlocking with fans using Air pressure differential switches
Can also be used to interlocked with Merlin CS1 and CS2 Switches
Reliable method of interlock, with no moving parts there’s little to go wrong
BMS Terminals Normally Closed or normally open and common
Clear LED display for system indications
163mm x 62mm x 113mm
Three year return to base warranty

 

S&S Northern Merlin CT1250 Gas Interlock Control Panel

S&S Northern Merlin CT1250 Gas Interlock Control Panel

S&S Northern Merlin CT1250 Gas Interlock Control Panel

Price: 286.00
(343.20 Including VAT at 20%)

The Merlin CT1250 ventilation interlock system, with built in current monitoring, is designed specifically for use in commercial kitchens to meet BS6173:2009 and IGEM/UP/19. This panel is to be used when the kitchen appliances do have flame failure devices, therefore Gas proving is not a requirement. The Merlin CT1250 acts as an interlock between the ventilation system and the gas solenoid valve. The system has built in current monitors in order to interlock with up to two fans and offers an alternative to using air pressure differential switches.

Allows Compliance with BS6173 and IGEM/UP/19 for commercial kitchens
To be used when all appliances have flame failure devices
2 built in current monitors can be easily adjusted to the user’s requirements
Reliable method of interlock, with no moving parts there’s little to go wrong
BMS Terminals Normally Closed or Normally open and common.
Will accept remote emergency knock-off buttons.
Can monitor 2 fans with running currents between 0.1A – 20A.
Clear LED display for system indications
Can be used when pressure differential switches cannot be used e.g. wall-mounted fans
Straightforward to install and calibrate. The CT1250 can be easily adjusted to the user’s requirements
Easy installation
178mm x 62mm x 254mm
Three year return to base warranty

S&S Northern Merlin CT1250 Brochure (right click & save target as) (file is in .pdf format)

 

S&S Northern Merlin CT1250X Gas Interlock Control Panel

S&S Northern Merlin CT1250X Gas Interlock Control Panel

S&S Northern Merlin CT1250X Gas Interlock Control Panel

Price: 397.00
(476.40 Including VAT at 20%)

The Merlin CT1250X ventilation interlock system, with built in current monitoring, is designed specifically for use in commercial kitchens to meet BS6173:2009 and IGEM/UP/19. This panel is to be used when the kitchen appliances do have flame failure devices, therefore Gas proving is not a requirement. The Merlin CT1250X acts as an interlock between the ventilation system and the gas solenoid valve. The system has built in current monitors in order to interlock with up to two fans and offers an alternative to using air pressure differential switches.

Allows Compliance with BS6173 for commercial kitchens
To be used when all appliances have flame failure devices
Internal LCD Display of the fan current for simple installation
Set high and low fan current range
Reliable method of interlock, with no moving parts there is little to go wrong
Will accept remote and emergency knock-off buttons
Can monitor 2 fans with running currents between 0.1A – 18A.
Clear LED display for system indication
178mm x 62mm x 254mm
Three year return to base warranty

 

S&S Northern Merlin CT1650+ Gas Interlock Control Panel

S&S Northern Merlin CT1650+ Gas Interlock Control Panel

S&S Northern Merlin CT1650+ Gas Interlock Control Panel

Price: 378.00
(453.60 Including VAT at 20%)

The Merlin CT1650+ ventilation interlock system is specifically designed for use in commercial kitchens to meet BS6173. This panel is designed for use when kitchen appliances do have flame failure devices fitted, therefore gas proving is not a requirement. The Merlin CT1650+ System acts as an interlock between the ventilation system and the gas solenoid valve. The systems uses unique built in current monitors displaying the exact fan current, in order to interlock with the ventilation with precision accuracy.

Allows Compliance with BS6173 for commercial kitchens
To be used when all appliances have flame failure devices
Internal LCD Display of the fan current for simple installation
Set high and low fan current range
Reliable method of interlock, with no moving parts there is little to go wrong
Will accept remote and emergency knock-off buttons
Can monitor 2 fans with running currents between 0.1A – 18A.
Clear LED display for system indication
254mm x 62mm x 178mm
Three year return to base warranty

 

S&S Northern Merlin 1500S Four Fan Speed Gas Interlock Control Panel

S&S Northern Merlin 1500S Four Fan Speed Gas Interlock Control Panel

S&S Northern Merlin 1500S Four Fan Speed Gas Interlock Control Panel

Price: 566.00
(679.20 Including VAT at 20%)

The Merlin 1500S System acts as an interlock between the ventilation system and the gas solenoid valve. The systems can work in conjunction with both current monitors and air pressure differential switches in order to interlock with up to 4 fans. This system has been designed specifically for use in commercial kitchens to meet BS6173 and IGEM/UP/19. This panel is to be used when the kitchen appliances do have flame failure devices, therefore gas proving is not a requirement

Allows compliance with BS6173 for commercial kitchens
Clear LED display for system indications
BMS normally closed or normally open and common
Interlocking with fans using either air pressure differential switches or fan current sensors
Easy installation
Will accept remote and emergency knock-off buttons
254mm x 62mm x 178mm
Three years return to base warranty

 

S&S Northern Merlin CT1450 Dual Fan Speed Gas Interlock Control Panel

S&S Northern Merlin CT1450 Dual Fan Speed Gas Interlock Control Panel

S&S Northern Merlin CT1450 Dual Fan Speed Gas Interlock Control Panel

Price: 678.00
(813.60 Including VAT at 20%)

The Merlin CT1450 System is microcontroller based ventilation interlock and fan speed controller for two single phase fans, this system has been designed specifically for use in commercial kitchens to meet BS6173 and IGEM/UP/19. This panel is to be used when the kitchen appliances do have flame failure devices, therefore gas proving is not a requirement. The Merlin CT1450 acts an interlock and control between the ventilation system and the gas solenoid valve. The system has two built in current monitors and speed controllers to interlock and control two single phase fans with running currents between 0.3A and 8A.

Allows Compliance with BS6173:2009 an IGEM/UP/19 for commercial kitchens
Clear LED display for system indications
To be used when all appliances have flame failure devices
Interlocks, and works as a fan controller all in one box
Includes Auto-Calibration to make it easy on installation
BMS Normally Closed or Normally Open and Common
Will accept remote and emergency knock-off buttons
Can control two fans with current between 0.3A and 8A
178mm x 118mm x 254mm
Three year return to base warranty

S&S Northern Merlin CT1450 Brochure (right click & save target as) (file is in .pdf format)

 

S&S Northern Merlin CT1750 Gas Proving Interlock Control Panel

S&S Northern Merlin CT1750 Gas Proving Interlock Control Panel

S&S Northern Merlin CT1750 Gas Proving Interlock Control Panel

Price: 691.00
(829.20 Including VAT at 20%)

The Merlin CT1750 System is an air quality control system. This panel acts an interlock between the ventilation and the gas solenoid valve and also controls the fan speed via 0-10v DC output. The 1750 also monitors carbon dioxide and carbon monoxide levels in the kitchen.

The system is compatible with both current monitors and air pressure differential switches and can interlock with up to 2 fans
The 1750 can also incorporates gas proving for when the gas appliances do not have flame failure devices
Complies with BS6173
Carbon monoxide and dioxide monitoring
Allows manual fan speed control (via 0-10v dc output)
Clear LED display for system indications
Ideal safety backup for solid fuel appliances
Interlocking with fans using either Air PD Switches or fan current sensors
Automatically increases the speed of the fans if used with CO2 and CO detectors, if detectors go into alarm , even if the panel is switched to the "off" position
Optional gas proving facility
Easy installation
Will accept remote emergency knock-off buttons
Can link to fire alarm or BMS systems
254mm x 62mm x 178mm
Three year return to base warranty

Please note this unit requires the Merlin gas pressure transducer for gas prooving available below

 

S&S Northern Merlin CO2-X Carbon Dioxide & Temperature Monitor

S&S Northern Merlin CO2-X Carbon Dioxide & Temperature Monitor

S&S Northern Merlin CO2-X Carbon Dioxide & Temperature Monitor

Price: 217.00
(260.40 Including VAT at 20%)

The Merlin CO2-X Monitor features a TFT display to show the user a clear precise reading of the CO2 level in the room and also uses a traffic light colour system to indicate whether the air quality in the room is at a safe, adequate or dangerous level.

The Merlin CO2-X can be used independently or can work in conjunction with one of our Merlin gas safety systems. In the event where the CO2 levels rose to a dangerous level the Merlin CO2-X Monitor will sound an audible alarm to alert the user of the danger, automatically drive ventilation fans reducing CO2 & temperature as well as shutting off any connected utilities such as gas solenoid valves or relays to boilers.

CO2 measured and displayed in parts per million (PPM).
Temperature can be displayed in degrees Celsius (°C) or Fahrenheit (°F).
0-10V Signal Output progress bar display.
Monitor, record and display average CO2 concentration over 8 hour periods.
User friendly settings menu.
Pre-alarm and alarm relay output.
Fan controller enabled relay output.
Dual power input 100-240vac or 12-24v ac or dc.
End of Life notification for CO2 sensing element.
Automatically switch between ventilation programs when gas is used.
Boost, Mute and Wake Up feature
95mm x 30mm x 140mm
Three year return to base warranty

S&S Northern CO2 Monitor Brochure (right click & save target as) (file is in .pdf format)

 

S&S Northern Merlin CO Detector

S&S Northern Merlin CO Detector

S&S Northern Merlin CO Detector

Price: 103.00
(123.60 Including VAT at 20%)

The Carbon Monoxide Detector is designed to work with a Merlin control panel. The Carbon Monoxide Detector is normally situated approximately 1 meter from ground level as Carbon Monoxide is a denser gas. When the sensor head detects carbon monoxide at a level exceeding 50ppm for over 4 minutes the attached system will trigger into the alarm state. This is resettable by rectifying any gas leak, allowing the sensor head to clear and restarting the Merlin panel.

Can work in conjunction with other Merlin Gas Safety Systems to ensure maximum safety.
Built in test button for onsite commissioning
Easy Installation
132mm x 38mm x 95mm
Three year return to base warranty

 

S&S Northern CS2 Dual Current Monitor

S&S Northern CS2 Dual Current Monitor

S&S Northern CS2 Dual Current Monitor

Price: 110.00
(132.00 Including VAT at 20%)

The Merlin CS2 Current Monitor is a dual fan current monitor and is to be used in conjunction with the Merlin range of kitchen ventilation interlock systems; it can be used as an alternative to an air pressure differential switch. The Live wire running between the fan controller and the fan goes through the hole and is to be looped around the coil to increase sensitivity. When the fan is running and a current is being drawn along the live feed, a magnetic field is induced through the coil and the current switch will send a closed contact along two low voltage cables to any Merlin Gas Interlock System.

Offers an alternative to air pressure differential switch.
Easy installation
Measures from 0.085amp-50amp running current
Can be used with any Merlin Kitchen Gas Safety Systems
163mm x 62mm x 113mm
Three year return to base warranty

 

S&S Northern PM2+ Double Current Monitor

S&S Northern PM2+ Double Current Monitor

S&S Northern PM2+ Double Current Monitor

Price: 210.00
(252.00 Including VAT at 20%)

The Merlin PM2+ is a dual fan current monitor and is to be used in conjunction with the Merlin 1500S, CT1750, 2000S & 3000S Systems; it can be used as an alternative to an air pressure differential switch. The system uses a unique built in current monitor which displays the exact fan current, in order to interlock with the ventilation with precision accuracy.

Internal LCD Display of the fan current for simple installation.
Set high and low fan current range.
Reliable method of interlock, with no moving parts there is little to go wrong.
Can monitor 2 fans with running currents between 0.1A – 18A.
Can be used when pressure differential switches cannot be used e.g. wall-mounted fans
Easy installation
163mm x 62mm x 113mm
Three year return to base warranty

 

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Click anywhere outside panel to close it.

Right panel

Clicking outside this panel wont close it because clickClose = false