Gas Alarm GX-D3
€193.19
The CO₂ detector for technical installations and CO₂ cylinders, with the sensor exactly where the gas collects
The Schabus CO₂ detector GX-D3 is a CO₂ warning device with an external sensor for beverage technology, cylinder storage and technical rooms. It monitors carbon dioxide (CO₂) from technical installations, for example in cold rooms, at beverage dispensing systems, in tea kitchens with water carbonators and in dry-ice applications. When the alarm thresholds are exceeded, it warns optically via LEDs and acoustically with a loud piezo buzzer. The display shows the current CO₂ concentration in percent in real time.
The GX-D3 is simply plugged into a 230 V Schuko socket; no battery is required. Carbon dioxide is heavier than air and collects near the floor when ventilation is inadequate. That is why the sensor is not built into the unit but connected by cable. This allows it to be placed independently of the socket, approx. 30 cm above the floor and close to the CO₂ source.
The maintenance-free NDIR infrared sensor measures CO₂ selectively. The alarm thresholds comply with the requirements of DIN 6653-2 for beverage dispensing systems. They are well above natural ambient air levels and below a hazardous value, so exhaled air and typical room-air fluctuations do not trigger an alarm. The detector has no options or variants and is ready for operation within a few minutes.
Important note: The GX-D3 is not suitable for fermentation cellars, industrial process areas or potentially explosive atmospheres. It may only be installed in dry indoor rooms. It does not replace the proper installation, use and maintenance of CO₂ systems, cylinders and fittings as well as the associated ventilation and safety equipment. Technical support is available for special solutions.
Plug in, place the sensor, stay protected
The GX-D3 combines simple installation with flexible sensor placement and two-stage alarming.
Plug-and-play
Socket-mounted device for Schuko outlets, without complex electrical installation and without a battery.
External NDIR sensor
Connected by cable and optimally positionable, for example near the floor close to the cylinders.
Real-time display
The current CO₂ concentration is clearly shown in percent.
Acoustic and optical
A loud piezo buzzer and LED indication provide unmistakable warnings.
Standard-oriented thresholds
Pre-alarm and main alarm are based on DIN 6653-2.
Maintenance-free
The sensor calibrates itself automatically and does not require manual calibration.
Test button
The function of the LEDs and signal transmitter can be checked at any time.
Mute function
The alarm tone can be acknowledged with the test button so that measures can be taken calmly.
What is included in the box
Everything needed for installation is included; nothing extra has to be purchased.
- CO₂ warning device GX-D3 (socket-mounted unit)
- External CO₂ sensor with connecting cable
- Mounting set for the sensor: 1 wall plug, 1 screw, 1 pack of cable clips
- Operating instructions
How the GX-D3 is designed
The system consists of the warning device with display and signal transmitter and the external sensor, which is connected to the unit by cable.
Warning device with Schuko plug
The unit is plugged directly into a 230 V Schuko socket and evaluates the sensor signal via a microprocessor.
Display
Shows the current CO₂ concentration in percent. During the warm-up period the software version is displayed; during the test function “D3”.
Status indicators (LEDs)
Three LEDs indicate the status: green for operation (Operate), yellow for fault (Error), red for alarm.
Acoustic signal transmitter
The piezo buzzer warns with a double tone in the pre-alarm and with a loud intermittent tone in the main alarm.
Test button
Checks the LEDs and signal transmitter. In the event of an alarm it acknowledges the alarm tone.
Cable connection for the external sensor
The sensor is plugged into the connection socket on the unit with its RJ connector. The sensor cable is 2.5 m long and must not be extended.
External NDIR sensor with air inlet slots
The non-dispersive infrared sensor measures the CO₂ concentration in the room air. The air inlet slots on the sensor and on the unit must never be covered or taped over. The sensor is fastened to the wall with a wall plug, screw and cable clips and blinks very slightly at regular intervals during operation.
Position the sensor correctly and put it into operation
Before installation and commissioning, carefully read the operating instructions and observe the safety notes in particular. The unit may only be installed in dry indoor rooms.
Placement of the external sensor
Near the floor
CO₂ from cylinders or dry ice sinks downwards. At dispensing systems the sensor is mounted approx. 30 cm above the floor.
Distance from edges and corners
At least 30 cm distance from edges, corners and the floor. Dead space can form in corners and delay the alarm.
Height determines sensitivity
The higher the sensor is placed, the less sensitive it becomes. The position also influences how often alarms occur.
These locations are not suitable for the sensor
- Places that could prevent alarm triggering, e.g. behind curtains, barrels, beverage crates or in cupboards
- Directly above a cooker / combustion appliance or above a sink
- Next to doors, windows, ventilation, fans or air-conditioning units
- Areas where dust, moisture or dirt could put the sensor out of service
- Fermentation cellars as well as potentially explosive atmospheres and industrial processes
Commissioning step by step
- Fasten the sensor to the wall with wall plug and screw, approx. 30 cm above the floor.
- Plug the RJ connector of the sensor cable into the unit and then plug the unit into the desired Schuko socket.
- After plugging in, an LED sequence runs from top to bottom (approx. 1 second each): green, yellow, red.
- Wait for the warm-up time of approx. 3 minutes. The green “Operate” LED flashes and the software version appears on the display. During this time the sensor is not yet active.
- After the warm-up time the green LED lights continuously and the display shows a percentage value. The GX-D3 is ready to measure and warns reliably.
How the GX-D3 responds
Depending on the measured CO₂ concentration, the GX-D3 warns in two stages. The values are based on the technical guidelines for beverage dispensing systems in the catering industry according to DIN 6653-2:2015-06.
Normal operation: below 1.5 % CO₂
The green LED lights and the display shows the current CO₂ value.
Pre-alarm from 1.5 % CO₂ (15,000 ppm)
The red LED lights and a double tone sounds after approx. 10 seconds. If the value falls below the pre-alarm threshold again, the unit returns to normal operation.
Main alarm from 3.0 % CO₂ (30,000 ppm)
The red LED flashes and a loud intermittent tone sounds after approx. 3 seconds. The alarm remains active until the CO₂ concentration has fallen significantly.
Test and functional check
- Press the test button: All LEDs light, a continuous piezo tone sounds and “D3” appears on the display.
- Check sensor function: Briefly blow exhaled air onto the air inlet slots of the external sensor. If the CO₂ reading on the display changes, e.g. to 0.58 %, the sensor is working correctly.
The test phase should be carried out regularly, ideally at least once a month. The test with the test button only checks the acoustic alarm transmitter and the LEDs and says nothing about the condition of the sensor. Dust can be removed from the sensor by blowing; please keep moisture away from the sensor.
Muting the alarm
The alarm tone can be acknowledged with the test button. The tone is then silenced so that measures such as ventilating or eliminating the cause can be initiated. At the next threshold change the alarm becomes active again.
Behaviour in the event of an alarm
- Stay calm and warn people: leave the endangered area and warn other people in the vicinity.
- Supply fresh air if it can be done safely: open doors and windows and ensure thorough ventilation.
- Stop the CO₂ supply if it can be done safely: close valves / gas supply, stop the dry-ice supply.
- Have the cause checked: have the CO₂ system, dispensing system or dry-ice application checked for defects or leaks by qualified specialist personnel only.
- Return only after clearance: Do not enter the endangered area if the CO₂ concentration remains high. In the event of a main alarm, no person may enter the endangered area without self-contained breathing apparatus.
Error displays and troubleshooting
Yellow LED flashes, a beep every 30 seconds
Possible cause: Sensor or unit fault (the external sensor does not flash). Unplug and plug the unit back in, check the plug connection on the unit. If the fault persists, contact support and only send the unit to Schabus after consultation.
All LEDs and the display are off
Possible cause: Socket has no power or the unit is defective. Check the power supply. If the unit remains off, send it to Schabus for inspection.
Green LED lights but the display shows implausible values
Possible cause: Sensor drift or incorrect calibration after prolonged operation. Operate the unit with the sensor in fresh air until the display shows 0.04 % CO₂ again. If the value remains higher, operate the unit for 7 days in a well-ventilated room (not directly in outdoor air). Afterwards 0.04 % should be displayed again.
The unit must not be opened or repaired by the user. In the event of internal contamination, malfunctions or persistently implausible measured values, contact Schabus support.
How to keep the GX-D3 reliable
Cleaning
If necessary, clean the housing with a soft, dry or slightly damp cloth. Carefully remove dust from the air inlet slots, e.g. with a soft brush.
Do not use
No solvents or alcohol, no aggressive cleaning agents, no water, spray water or high-pressure air.
Automatic calibration
The sensor calibrates itself every 7 days. The lowest measured CO₂ value is used as the reference for 400 ppm (0.04 % CO₂). At least 30 minutes of fresh air supply daily, e.g. by opening windows, supports calibration, measuring accuracy and service life.
Long service life
The expected service life of the NDIR sensor is approx. 10 years. In a regularly well-ventilated room it increases significantly.
Beverage dispensing systems and commercial installations
When monitoring beverage dispensing systems, the relevant regulations and rules must be observed, in particular DGUV Rule 110-007 and DIN 6653-2. The unit should be correctly positioned (sensor approx. 30 cm above the floor) and the alarm must be perceptible both outside and inside the hazard area.
For commercial installations, involve the responsible employers’ liability insurance association and, if applicable, the trade supervisory authority in the planning before installation so that nothing stands in the way of acceptance. Requirements can vary regionally; the manufacturer has no influence on this.
Manufacturer’s notes
- Carefully read and keep the operating instructions before installation and commissioning
- Installation should be carried out by a qualified specialist
- Do not open the unit; it contains no parts that can be serviced by the user
- Not for children or persons with limited abilities unless they are supervised or have been instructed in safe use
- Packaging material is not a toy and must be kept away from children
- Suitable for normal household use and commercial premises with household-like use; not approved for other applications
- Intended for residential buildings, sales areas as well as tea kitchens and pantries, each with connection to the public low-voltage network
- The EU declaration of conformity is available for download on the manufacturer’s website
Warranty, guarantee, returns and disposal
The GX-D3 is covered by the statutory warranty of at least 2 years in the EU. The manufacturer Elektrotechnik Schabus additionally 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. In the event of a warranty claim, a fault description, proof of purchase and complete contact and delivery details are required. Damage caused by improper use, modifications to the unit, external influences or unauthorised repairs is excluded.
Returns: First contact support and discuss the procedure, then pack the unit securely against breakage and enclose a note with the fault description, contact details and a copy of the proof of purchase. No unit should be sent without prior consultation; unpaid shipments cannot be accepted.
The GX-D3 must not be disposed of with household waste. In accordance with Directive 2012/19/EU (WEEE) it must be collected separately at the end of its life, e.g. at a municipal collection point for electrical equipment (WEEE Reg. No. DE 91394868). Please also dispose of packaging material in an environmentally friendly manner.
Areas of application
- Beverage dispensing systems in bars and catering
- Tea kitchens and offices with water carbonators and CO₂ cylinders
- Common and break rooms with carbonators
- Cold rooms with dry ice or CO₂ cooling
- CO₂ cylinder storage
- Technical rooms with CO₂ systems
- Small businesses with dispensing systems and storage
- Temporary use, e.g. events with mobile carbonators
- Schools and laboratories with household-like use
The Schabus CO₂ detector GX-D3: Protection starts at the socket and with the sensor exactly where the risk is.
Frequently asked questions
What is the GX-D3 suitable for?
For monitoring carbon dioxide in indoor rooms and technical installations, for example at beverage dispensing systems and water carbonators, in suitable cold and technical rooms and in dry-ice applications. It is not suitable for fermentation cellars, industrial process plants and potentially explosive areas.
What is the difference between GX-D3 and GX-D33?
The GX-D3 has an external CO₂ sensor with connecting cable and can therefore be positioned independently of the socket at a suitable measuring point. On the GX-D33 the sensor is integrated in the unit. The GX-D3 is particularly suitable when the socket is not at the optimum measuring height.
Where do I mount the external sensor?
CO₂ is heavier than air and collects near the floor when ventilation is inadequate. The sensor is mounted approx. 30 cm above the floor and with at least 30 cm distance from room corners and obstacles. It should be freely accessible and not covered by objects.
Can the sensor cable be extended?
No. The 2.5 m long cable must not be extended, as an extension can impair the reliable function of the sensor. Choose a socket within the existing cable length.
How is the sensor connected?
Via the RJ connector at the connection socket of the unit. Then fasten the sensor at the measuring point and plug the unit into a 230 V Schuko socket. No complex electrical installation is required.
From which CO₂ concentration does the GX-D3 trigger an alarm?
The pre-alarm occurs from 1.5 vol.% CO₂ (15,000 ppm): the red LED lights and a double tone sounds. The main alarm occurs from 3.0 vol.% CO₂ (30,000 ppm): the red LED flashes and a loud intermittent tone sounds.
How long does it take until the GX-D3 is ready for operation?
After plugging in, a short LED self-test runs, followed by a warm-up phase of about three minutes during which the green LED flashes. As soon as it lights continuously and the display shows the CO₂ value, the unit is ready to measure.
How do I check whether the sensor is working?
Press the test button to check the LEDs and signal transmitter. For the sensor function, briefly blow exhaled air onto the air inlet slots of the sensor. If the displayed CO₂ value rises, the sensor is responding correctly. Checking at least once a month is recommended.
Does the sensor need to be calibrated?
No. The maintenance-free NDIR sensor calibrates itself automatically every seven days. For this to work reliably it needs regular fresh air: preferably at least 30 minutes of adequate ventilation daily.
What does the flashing yellow LED mean?
Together with a signal tone every 30 seconds it indicates a sensor or unit fault. Check the plug connection of the sensor, briefly disconnect the unit from the mains and put it back into operation. If the fault persists, contact support.
The display shows implausible values. What should I do?
Operate the unit with the sensor in fresh air until 0.04 % CO₂ is displayed again. If the value remains higher, operate it for 7 days in a well-ventilated room, not directly in outdoor air.
How long does the sensor last?
The expected service life is about ten years. Regular fresh-air supply and clean sensor openings support long-term function.
What must I do in the event of an alarm?
Warn people and leave the endangered area. Only if it can be done safely, ensure fresh air and interrupt the CO₂ supply. Only re-enter the area when there is no longer any hazard, and have the cause checked by specialist personnel.
Do I have to involve authorities before installation?
For commercial installations the manufacturer recommends involving the employers’ liability insurance association and the trade supervisory authority in advance so that nothing stands in the way of acceptance. Requirements can vary regionally.
How long is the guarantee valid?
The statutory warranty of at least 2 years applies in the EU. In addition, Schabus offers a 5-year guarantee that can be registered online.
Questions about the CO₂ detector GX-D3?
Our support team in Germany will advise you free of charge on selection, installation and configuration.
GAS ALARM GX-D3 – For Technical Installations
The GX-D3 is a CO₂ gas detector designed for technical installations and work areas where CO₂ may occur from technical sources – e.g. in cold rooms, beverage dispensing systems, or kitchenettes with carbonators. With its external NDIR infrared sensor, the monitoring area can be positioned optimally, while the unit itself operates conveniently as a plug-in device.
Optical and acoustic warning signals ensure reliable alerting. The alarm thresholds comply with DIN EN 6653-2. Before installation, the trade association and occupational safety authority should be consulted, as regional regulations may vary.
Technical Data
- Operating voltage: 230 V AC (±10%), 50–60 Hz
- Power consumption: max. 3 VA
- Protection rating: IP 20
- Sound pressure level: < 85 dB(A) (at 10 cm distance)
- Display: LED indicators (green = operation, yellow = fault, red = alarm)
- Dimensions (H×W×D): 118 × 60 × 44 mm
- External sensor cable length: 2.5 m (not extendable)
Sensor & Alarm
- Sensor type: external NDIR infrared sensor
- Warm-up time: approx. 3 minutes
- CO₂ trigger concentration:
– 1.5 % pre-alarm
– 3.0 % main alarm
in accordance with DIN EN 6653-2
Environmental Conditions
- Operating range (sensor): 0 °C to +40 °C
- Storage temperature: -20 °C to +70 °C
- Humidity: 5–90 % rH (non-condensing)
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
