GX-LNG Gas Sensor
€79.83
The external gas sensor for natural gas, town gas and LPG: accessory for Schabus gas alarm control panels, catalytic, with 2.5 m connection cable
The Schabus gas sensor GX-LNG reliably detects flammable gases such as natural gas, propane, butane, town gas and LNG. It is an external sensor and is used as an accessory with the gas warning devices of the Schabus product range. In combination with a gas alarm control panel, it enables early warning of gas leaks.
The GX-LNG detects natural gas (methane), LPG (propane and butane), town gas, LNG (Liquefied Natural Gas) as well as R290 (propane as refrigerant). Typical sources are leaks from the domestic installation, for example at a gas cooker, gas boiler or gas-fired heater, from cylinder gases or from leaking fittings.
The sensor supplies the control unit with an analogue voltage signal that changes with the gas concentration. Evaluation and alarming are performed by the connected gas alarm control panel. It cannot be used as a stand-alone gas detector.
Important note: The GX-LNG only works in conjunction with the gas alarm control panel GX-A1+ or the gas control unit GX-HS. It must not be used in potentially explosive atmospheres. Installation must be carried out by a qualified specialist, and the sensor cable must be installed permanently as a surface-mounted cable. Always observe the prescribed sensor position.
Good to know: After initial installation, the sensor requires a warm-up period of up to 6 days, depending on ambient conditions. It then calibrates itself automatically. Only after this does it achieve the specified measuring accuracy.
Invisible gas, visible safety
The GX-LNG combines the detection of several flammable gases with simple installation and flexible placement.
For several gas types
Natural gas (methane), town gas, LPG (propane and butane), LNG and R290.
External sensor
Accessory for the gas alarm control panel GX-A1+ and the gas control unit GX-HS. The sensor can be placed where the gas accumulates.
Catalytic sensor
Highly sensitive and responds to the smallest quantities of gas.
2.5 m connection cable
3-core sensor cable with RJ connector on the cable. The cable can be extended if required.
Early warning
Detects leaks from gas cookers, gas boilers, gas-fired heaters, cylinder gas and leaking fittings.
Self-calibration
After the warm-up period, the sensor calibrates itself automatically.
Also used in Schabus plug-in gas detectors
The sensor is also installed in the plug-in gas detectors GX-B2pro and GX-B3.
Factory inspection
The date of the next sensor inspection is marked on the sensor. The manufacturer inspects or replaces it at the factory.
What is included in the box
The device has no options and no additional variants.
- Gas sensor GX-LNG
- 3-core sensor cable
- Mounting material
- Operating instructions
The gas alarm control panel (GX-A1+ or GX-HS) is not included in the scope of delivery. The sensor can only be used in conjunction with one of these control panels.
How the GX-LNG is constructed
The sensor is housed in a compact light-grey plastic enclosure. The gas reaches the sensor element through the ventilation slots on the front; the cable exits the enclosure on one of the narrow sides.
Plastic enclosure with ventilation slots
The slots allow the gas to reach the sensor element. For this reason the sensor must hang freely and must not be covered, for example behind curtains or inside cabinets. The enclosure must not be opened; it contains no parts that can be serviced by the user.
Type plate “GX-LNG Detector for LNG / Methane / Propane”
The plate on the front states the type and gas types. When installed correctly, the lettering is upright. The position is prescribed: the sensor must not be mounted upside down or lying on its side.
Catalytic sensor element
It is located inside the enclosure behind the slots. It is highly sensitive for good reason and responds to the smallest quantities of gas. Every contact with gas contributes to wear.
Connection cable
The white sensor cable is 3-core and 2.5 m long. An RJ connector is fitted on the cable. The cable can be extended (see Installation). How to connect the sensor to the gas warning device is described in its operating instructions.
Mounting material and fastening
With the supplied mounting material you fasten the sensor securely to the wall at the height prescribed for the respective gas type.
How the GX-LNG works
The GX-LNG has an analogue voltage output. The voltage changes depending on the gas concentration. The connected gas alarm control panel evaluates it and triggers pre-alarm and main alarm in the event of a gas escape.
No gas
The sensor supplies the control unit with its quiescent voltage. No warning is given.
Gas escapes
The sensor voltage rises with the gas concentration. The gas alarm control panel shows the voltage increase on the display.
Alarm
The gas alarm control panel warns and switches its relays. Details are given in the operating instructions of the control unit.
Which devices the GX-LNG works with
The GX-LNG is a pure accessory sensor and cannot be used as a stand-alone gas detector.
- Gas alarm control panel GX-A1+
- Gas control unit GX-HS
- Installed in the plug-in gas detectors GX-B2pro and GX-B3
- Not intended for other devices or standalone operation
Place correctly according to gas type
Gases have different properties. For the warning device to function properly, the sensor must be placed correctly according to the gas type. For your own safety, ask your gas supplier about the gas type and its properties.
Town and natural gas (methane, CH4)
These gases are lighter than air and rise. Mount the sensor 15 to 30 cm below the ceiling, no more than 4 m from the gas appliance. It must be above the highest door or window opening in the room.
LPG, LNG (propane C3H8, butane C4H10)
LPG is heavier than air and sinks to the floor. It spreads there in a similar way to water and seeks the lowest point. Mount the sensor no more than 15 cm above the floor, no more than 4 m from the gas appliance.
The sensor must not be mounted
- In locations that could prevent the alarm from being triggered in the event of a gas escape, for example behind curtains or inside cabinets
- Directly next to a cooker or above a sink
- In areas where dust or dirt can put the sensor out of operation
- In potentially explosive atmospheres
Install, connect and commission correctly
Installation must be carried out by a qualified specialist. The sensor may only be installed in dry indoor rooms.
Installation steps
- Select the mounting location according to the gas type (see Placement) and observe the locations where the sensor must not be mounted.
- Fasten the sensor with the supplied mounting material in the prescribed position. The lettering must be upright and readable; the sensor must not sit upside down or on its side.
- Route the sensor cable permanently as a surface-mounted cable.
- Connect the sensor to the gas warning device. How to do this is described in its operating instructions.
Extending the sensor cable
The cable is 2.5 m long as standard. If you wish to extend it, use a 3-core cable. At 24 V operating voltage the following options apply:
- Cable cross-section 3 × 0.14 mm²: maximum length 20 m
- Cable cross-section 3 × 0.5 mm²: maximum length 50 m
- At the transfer point at least 4.9 to 25 V must be present. Please observe this carefully
- For longer runs, pay attention to the cable cross-section
First commissioning
- After switching on, the sensor requires a warm-up period that can last up to 6 days depending on ambient conditions.
- Automatic self-calibration then takes place.
- Only after the warm-up period and self-calibration does the sensor achieve the specified measuring accuracy.
Testing the sensor correctly
For your safety, the manufacturer recommends performing the test every 6 months.
- Hold a lighter (without flame), for example, at least 10 to 20 cm above the sensor and allow the escaping gas to settle briefly onto the sensor.
- If the display of the GX-A1 shows a voltage increase in the second line, the sensor is working correctly.
- With the GX-HS, perform the test at least until the GX-HS switches to pre-alarm in order to recognise a reaction. Further information can be found in the operating instructions of the gas warning device.
Do not overdo it: Every contact with gas contributes to wear and shortens the service life, even if only minimally. If you virtually “bathe” the highly sensitive sensor in gas, you can destroy it. Never use pure gas from refill bottles, cartridges or gas lighters; this would destroy the sensor immediately.
What to do in the event of an alarm or gas smell?
- Do not switch off the warning device
- Do not put any further electrical devices into operation
- Do not light any open flame / extinguish any open fire
- Open windows and doors and ventilate the room thoroughly
- Interrupt the main gas supply and have the cause of the gas escape eliminated
- In the event of a persistent or repeated alarm, contact the responsible gas supplier or a specialist
Where the GX-LNG may be used
- Only in dry indoor rooms, connected to the public low-voltage network
- Residential buildings and areas such as houses, flats and rooms
- Sales areas such as shops and hypermarkets
- Rooms of small businesses such as workshops and service centres
- Boiler rooms and technical rooms
- Motorhomes and caravans, catering, storage areas with gas cylinders
- Not in potentially explosive atmospheres and not for any use other than that described
- Read the operating instructions thoroughly before installation and commissioning and keep them
- Packaging material is not a toy and does not belong in children’s hands
- The manufacturer is not liable for damage or loss resulting from the fact that no alarm signal is given despite elevated gas concentration
What the GX-LNG does not do
- It is not a stand-alone gas detector and does not warn by itself. Alarming is performed by the gas alarm control panel
- It is only intended for GX-A1+ and GX-HS
- It is not approved for potentially explosive atmospheres
- It may only be installed in dry indoor rooms, not outdoors and not in wet locations
- The prescribed installation position and mounting height must be observed, otherwise proper function cannot be guaranteed
- Dust or dirt can put the sensor out of operation
- It must be protected against moisture, pressure and draughts
- Measuring accuracy is only achieved after the warm-up period and self-calibration
- The sensor has no options or additional variants
Cleaning and finding faults
Cleaning and care
- Keep moisture (splash or rain water), dust and direct sunlight away from the device
- Clean the sensor regularly by blowing off the dust
- Clean the device only with a dry linen cloth; in the event of heavy soiling it may be slightly moistened
- Do not use solvent-based cleaning agents
- Perform the function test every 6 months
- Observe the inspection date (month/year) on the sensor and return the sensor to Elektrotechnik Schabus for factory inspection or replacement
Troubleshooting
False alarms?
In the event of false alarms, either the sensor or the cable is defective and must be replaced. Also clean the sensor regularly of dust.
Sensor not responding as expected yet?
After initial installation the warm-up period of up to 6 days runs, followed by self-calibration. Only after this is the specified measuring accuracy achieved.
No voltage increase during the test?
Check placement, connection and cable, and follow the instructions of the gas warning device. If the fault persists, contact the manufacturer.
In the event of service and returns
- Contact us if the device is defective and state your complete address as well as the reason for return.
- The manufacturer will arrange free collection of the parcel for you, but only within Germany.
- Pack the device adequately. Enclose a fault description, proof of purchase as well as your address and delivery address (name, telephone number, street, house number, postcode, town, country).
Unpaid parcels cannot be accepted by the manufacturer. Unjustified returns that do not constitute a warranty case will be charged subsequently. The manufacturer accepts no liability for damage or loss during shipping.
Statutory warranty, guarantee and disposal
The GX-LNG is covered by the statutory warranty of at least 2 years in the EU. In the event of material defects and quality deficiencies, the manufacturer repairs or replaces the device free of charge provided it has been used in accordance with the operating instructions. The manufacturer is not liable for damage due to accident, misuse, modification or negligence, nor for loss, damage or expenses of any kind arising from the use of the devices or accessories. In addition, Elektrotechnik Schabus offers a 5-year guarantee that can be registered online. Repair and spare parts are available directly from the manufacturer, also beyond the statutory warranty.
The product meets the statutory, national and European requirements and bears the CE marking. The CE declaration and the operating instructions can be found on the manufacturer’s website. The operating instructions in English are available in the manufacturer’s download centre.
The GX-LNG does not belong in household waste. The crossed-out waste bin symbol on the product reminds you to use the take-back systems so that the materials can be reused in an environmentally friendly way at the end of their service life (WEEE reg. no. DE91394868). Further information is available from your local waste advisory service or from the manufacturer.
Why the GX-LNG is suitable
One sensor, several gases
Natural gas, town gas, propane, butane, LNG and R290 with one sensor type.
Freely placeable
The external sensor is located where the gas accumulates, at the appropriate height for light or heavy gases.
Early warning
In combination with GX-A1+ or GX-HS it warns of gas leaks before they become dangerous.
Extendable cable
The 2.5 m cable can be extended to up to 20 m or 50 m if required.
Factory inspection
The inspection date is marked on the sensor; the manufacturer inspects or replaces it at the factory.
Directly from the manufacturer
Personal expert advice without a call centre, 5-year guarantee that can be registered, repair and spare parts directly from the manufacturer.
Areas of application
- Gas-fired heaters and boilers
- Gas cookers
- Boiler rooms and technical rooms
- Motorhomes and caravans
- Catering
- Workshops
- Storage areas with gas cylinders
- Rooms with R290 (propane as refrigerant)
The Schabus gas sensor GX-LNG: Invisible gas, visible safety.
Frequently asked questions
What is the gas sensor GX-LNG?
The GX-LNG is an external, catalytic sensor for detecting flammable gases. It is used as an accessory with Schabus gas warning devices and reports to the gas alarm control panel via its voltage signal when gas escapes.
Which gases does the GX-LNG detect?
Natural gas (methane), town gas, LPG (propane and butane), LNG (Liquefied Natural Gas) and R290 (propane as refrigerant).
Can I use the sensor on its own?
No. It cannot be used as a stand-alone gas detector. It only works in conjunction with the gas alarm control panel GX-A1+ or the gas control unit GX-HS.
What is included in the scope of delivery?
The gas sensor GX-LNG, a 3-core sensor cable, mounting material and the operating instructions.
Where must the sensor be mounted?
For town and natural gas (methane) 15 to 30 cm below the ceiling, above the highest door or window opening. For LPG (propane, butane) no more than 15 cm above the floor. In both cases no more than 4 m from the gas appliance.
Where must the sensor not be mounted?
Not behind curtains or inside cabinets, not directly next to a cooker or above a sink, not in dusty or dirty areas and not in potentially explosive atmospheres.
Can I extend the sensor cable?
Yes, with a 3-core cable. At 24 V operating voltage a maximum of 20 m is possible with 3 × 0.14 mm², and a maximum of 50 m with 3 × 0.5 mm². The cable must be routed permanently as a surface-mounted cable.
How long does it take after installation until the sensor is ready?
The sensor requires a warm-up period of up to 6 days, depending on ambient conditions. It then calibrates itself automatically and achieves the specified measuring accuracy.
How do I test the sensor?
Hold a lighter (without flame), for example, at least 10 to 20 cm above the sensor and allow the gas to settle briefly onto the sensor. If the display of the GX-A1 shows a voltage increase in the second line, the sensor is working. With the GX-HS, test until the pre-alarm switches. The manufacturer recommends the test every 6 months.
May I use pure gas from a refill bottle for testing?
No. Pure gas from refill bottles, cartridges or gas lighters would destroy the sensor immediately. Too much gas during the test can also damage it.
What to do in the event of a gas alarm?
Do not switch off the warning device, do not put any further electrical devices into operation, do not light any open flame, open windows and doors and ventilate thoroughly, interrupt the main gas supply and have the cause eliminated. In the event of a persistent or repeated alarm, contact the gas supplier or a specialist.
What do I do in the event of false alarms?
In the event of false alarms, either the sensor or the cable is defective and must be replaced. Also clean the sensor regularly of dust.
How do I clean the sensor?
Remove the dust by blowing. Protect the sensor against moisture, pressure and draughts. Clean the enclosure with a dry linen cloth; in the event of heavy soiling it may be slightly moistened. Do not use solvent-based cleaning agents.
What does the date on the sensor mean?
The date (month/year) for the next sensor inspection is marked on the sensor. Return the sensor then to Elektrotechnik Schabus for factory inspection or replacement.
Where may the sensor be used?
In dry indoor rooms of residential buildings, sales areas and rooms of small businesses, for example boiler rooms, technical rooms, workshops, catering, motorhomes and storage areas with gas cylinders. Not in potentially explosive atmospheres.
Are there options or additional variants?
No. The GX-LNG has no options.
How long is the guarantee valid?
The statutory warranty of at least 2 years applies in the EU. In addition, Elektrotechnik Schabus offers a 5-year guarantee that can be registered online.
Questions about the gas sensor GX-LNG?
Our support team in Germany will advise you free of charge on selection, installation and configuration.
Catalytic Gas Sensor
The catalytic gas sensor is used for reliable detection of combustible gases in industrial and commercial applications. It provides a stable output voltage and can be operated over a wide voltage range. Due to its compact design and long service life, the sensor is ideal for integration into monitoring systems.
Technical Data
- Operating voltage: 5–24 V DC
- Current consumption: max. 175 mA
- Sensor output voltage: 1–3.3 V
- Heating current: 175 mA
- Sensor type: Catalytic
- Ambient humidity: 5–90 % RH (non-condensing)
- Operating temperature range: -10 °C to +50 °C
- Storage temperature: -20 °C to +70 °C
- Service life: approx. 5 years
- Protection rating: IP20
- Cable length: 2.5 m
- Cable diameter: 3.5 mm
- Dimensions (H x W x D): 52 × 27 × 29 mm
Manufacturer information:
Electrical engineering Schabus GmbH & Co. KG
Baierbacher Straße 150
83071 Stephanskirchen
Germany
Telephone: +49 80 36 / 674 979 – 0
Email: info@elektrotechnik-schabus.de
Responsible person:
Didactum® Security GmbH
Im Mühlenfeld 4
48163 Münster
Deutschland
Fon:
(+49) 250 19 71 63 54 / (+49) 171 33 11 577
Email: info@didactum-security.de
