Gas Alarm GX-D33
€150.84
The CO₂ detector for technical systems and CO₂ pressure cylinders: plug in, detect leaks, be warned in time
The Schabus CO₂ Detector GX-D33 is a plug-in warning device for technical applications with CO₂ pressure cylinders. It monitors rooms with beverage dispensing systems, water carbonators, compressed gas cylinders and dry ice storage as well as cooling and technical rooms. A maintenance-free NDIR sensor continuously measures the carbon dioxide concentration (CO₂) and displays the current value in % on the display. When the alarm thresholds are exceeded, the GX-D33 warns optically via LEDs and acoustically with a loud signal tone.
Unlike room-air CO₂ detectors, the alarm thresholds are specifically matched to technical leaks. The detector warns in two stages, well below a hazardous level but clearly above the normal CO₂ load in indoor air. This avoids false alarms caused by normal room air, while a leaking regulator, a porous line or a toppled cylinder are detected early. The thresholds are based on the technical guidelines for beverage dispensing systems in the hospitality industry according to DIN 6653-2.
The GX-D33 is simply plugged into a Schuko socket in the lower part of the room, is ready for operation after about 3 minutes and requires neither batteries nor a sensor cable. The function can be checked at any time with the test button.
Important note: The GX-D33 is intended exclusively for the detection of CO₂. It is not suitable for potentially explosive atmospheres, not for industrial process areas and not for fermentation cellars. The device does not replace the proper installation, use and maintenance of CO₂ systems, fittings, or ventilation and safety equipment.
Tip before installation: Involve the employers’ liability insurance association and the trade supervisory authority in your planning before installation so that acceptance is not obstructed. There are clear regional differences over which Elektrotechnik Schabus has no influence.
Plug in, measure, warn
The GX-D33 combines a maintenance-free NDIR sensor with two alarm stages matched to technical leaks.
For technical CO₂ systems
Monitors rooms with CO₂ pressure cylinders, beverage dispensing systems, water carbonators, dry ice as well as cooling and technical rooms.
Adapted alarm thresholds
The thresholds are matched to technical leaks. Normal CO₂ concentrations of room air do not trigger an alarm.
Maintenance-free NDIR sensor
Infrared measuring technology without cross-sensitivity to other gases, long-term stable and without contact with water.
Display in %
The easily readable display shows the current CO₂ concentration in %.
Two alarm stages
Pre-alarm and main alarm warn optically via LEDs and acoustically with a loud signal tone.
Simply plug in
230 V socket device with Schuko plug, no battery, no sensor cable. Ready for operation after about 3 minutes.
Automatic calibration
The sensor calibrates itself every 7 days. It does not need to be calibrated manually.
Test button
Checks LEDs, display and signal tone. With a little exhaled air the reaction of the sensor can additionally be tested.
Alarm can be acknowledged
The acoustic alarm can be muted with the test button so that you can take measures.
Anti-theft protection available
As an accessory there is an anti-theft protection that also serves as child protection.
What is included in the box
The device is ready for immediate use. It has no options and no additional variants.
- CO₂ warning device GX-D33
- Operating instructions
How the GX-D33 is constructed
Sensor, evaluation, display and signal tone are combined in a compact socket device. Room air flows through the air inlet slots to the sensor; the microprocessor evaluates the signal and controls display, LEDs and signal tone.
Housing with Schuko plug
The impact-resistant plastic housing is a socket device. It is plugged directly into a 230 V Schuko socket and supplies itself from the mains.
Air inlet slots
Through the slots on the front the room air reaches the sensor. They must always be free of dust and dirt and must neither be covered nor taped over.
NDIR sensor
The integrated non-dispersive infrared sensor continuously measures the CO₂ concentration of the room air. It is maintenance-free.
Microprocessor
It evaluates the measuring signal, controls display, LEDs and signal tone and performs the automatic calibration.
Display
The display shows the current CO₂ concentration in %. At start-up the software version appears briefly; during the test “D33”.
Status indicators (LEDs)
Operate (green) indicates operation, Error (yellow) a fault and Alarm (red) an alarm stage.
Acoustic signal tone
The signal tone at the top of the device warns in the pre-alarm with a double tone and in the main alarm with a loud interval signal.
Test button
With the test button you check LEDs and signal tone and, in the event of an alarm, acknowledge the alarm tone.
Two stages, two signals
Depending on the CO₂ concentration a warning is given in two stages. The values are based on the requirements of the technical guidelines for beverage dispensing systems in the hospitality industry according to DIN 6653-2.
| Stage | CO₂ concentration | Display and alarm |
|---|---|---|
| Normal operation | below 1.5 % (up to 15,000 ppm) | Green LED lights, the display shows the current CO₂ value |
| Pre-alarm | from 1.5 % (from 15,000 ppm), after approx. 10 seconds | Red LED lights, acoustic double tone (medium) |
| Main alarm | from 3.0 % (from 30,000 ppm), after approx. 3 seconds | Red LED flashes, acoustic interval signal (loud) |
When the CO₂ concentration falls again below the pre-alarm value, the device returns to normal operation. In the main alarm the alarm remains active until the concentration has fallen significantly. You can acknowledge the alarm tone with the test button; this mutes it. At the next threshold change the alarm is active again.
Place correctly and put into operation
CO₂ is heavier than air and sinks downwards. The GX-D33 may only be installed in dry indoor rooms and must be placed correctly so that CO₂ is reliably detected.
Placement of the detector
In the lower part of the room
Plug the device into a 230 V Schuko socket in the lower part of the room. For monitoring permanently installed dispensing systems choose a socket about 30 cm above the floor.
Maintain distance
Keep at least 30 cm distance from edges, corners and the floor. In corners dead-space formation can occur that delays the alarm.
Height influences sensitivity
The higher the device is mounted, the less sensitive it becomes. Depending on the CO₂ source the position influences sensitivity and the frequency of messages.
These locations are not suitable
- Places that could prevent the alarm from being triggered, e.g. behind curtains, barrels, beverage crates or in cupboards
- Directly above a cooker or combustion appliance or above a sink
- Next to a door, windows, ventilation, fan, air-conditioning unit etc.
- Areas in which dust, moisture or dirt can put the sensor out of operation
- Fermentation cellars: the device is not suitable for this
Commissioning
- Plug the device into the socket. An LED light sequence then runs from top to bottom, each LED about 1 second.
- Wait for the warm-up time of about 3 minutes. The green Operate LED flashes, the software version appears in 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 % figure, the measured CO₂ concentration. The device is now ready for use and warns reliably.
Test the function regularly
Carry out the test phase regularly to ensure proper function. At least once a month is recommended.
How to check the GX-D33
- Press the test button: all LEDs light, a continuous beep sounds and “D33” appears in the display.
- Briefly blow exhaled air onto the air inlet slots. If the CO₂ reading changes, e.g. to 0.58 %, correct function is given.
With the test button the acoustic alarm sounder and the optical indicators are tested. This test says nothing about the condition of the sensor. Clean the sensor regularly by blowing away the dust and keep moisture away from the sensor.
Behaviour in the event of an alarm
- Warn persons present, stay calm and leave the endangered area
- If safely possible: open doors and windows and ensure thorough ventilation
- If safely possible: close valves or gas supply and stop the dry-ice supply
- Have the CO₂ system, dispensing system or dry-ice application checked for defects or leaks, only by qualified specialist personnel
- Return only after release: if the CO₂ concentration remains high, do not enter the endangered area
- In the main alarm no person without self-contained breathing apparatus may enter the endangered area
The device indicates early through pre-alarm and main alarm that action is required. The alarm serves your safety; react in time.
Use on beverage dispensing systems: When monitoring beverage dispensing systems the relevant regulations and rules must be observed, in particular DGUV Rule 110-007 and DIN 6653-2. Ensure correct positioning of the device (approx. 30 cm above the floor) and that the alarm is perceptible both outside and inside the hazard area.
Fault indications, cleaning and sensor
Indicating and clearing faults
- Yellow LED flashes and a beep sounds every 30 seconds: possible cause is a sensor or device fault. Unplug and plug the device in again. If the fault persists, contact support.
- All LEDs and the display are off: the socket is without power or the device is defective. Check the power supply; if the device remains off, send it to Schabus for checking.
- Implausible % values with the green LED lit: possible cause is sensor drift or incorrect calibration after a longer period of operation. Operate the device in fresh air until 0.04 % is displayed again. If the value remains higher, operate it for 7 days in a room with plenty of fresh air, not directly in outdoor air.
If the faults continue to occur, contact Schabus Support. Do not attempt to open or repair the device yourself.
Cleaning
- Clean the housing if necessary with a soft, dry or slightly damp cloth
- Carefully remove dust from the air inlet slots, e.g. with a soft brush
- Always keep the sensor openings free of dust and dirt
- Do not use: solvents or alcohol, aggressive cleaning agents, water, spray water or high-pressure air
Free air circulation
Free air circulation is important for rapid measuring results and reliable alarming. Do not cover or tape over the air inlet slots, do not operate the device behind curtains, barrels, beverage crates or in cupboards and maintain sufficient distance (at least 30 cm) from walls, corners and other objects.
Sensor calibration and service life
The sensor calibrates itself automatically every 7 days. In doing so it records the CO₂ content of the room air and uses the lowest measured value as reference for 400 ppm (0.04 % CO₂). Therefore ensure adequate fresh-air supply for at least 30 minutes every day, e.g. by window ventilation. This supports the calibration and increases measuring accuracy and service life. The expected service life of the NDIR sensor is about 10 years and increases in a regularly well-ventilated room. The sensor is maintenance-free and does not need to be calibrated manually. In the event of internal soiling, functional disturbances or persistently implausible measured values, contact Schabus Support.
Manufacturer’s notes
- Carefully read and keep the operating instructions before installation and commissioning
- Intended exclusively for the detection of CO₂ (carbon dioxide)
- Not for use in potentially explosive atmospheres and not in industrial process areas
- Not suitable for use in fermentation cellars
- Suitable for normal household use as well as for commercial rooms with household-like use, e.g. tea kitchens and pantries
- The device does not replace the proper installation, use and maintenance of CO₂ systems, fittings, or ventilation and safety equipment
- The device must not be used by children or persons with reduced physical, sensory or mental capabilities unless they are supervised or have been instructed in its safe use
- Do not open the device and do not repair it yourself; it contains no user-serviceable parts
- The CE declaration is available for download on the manufacturer’s website
Possible accessories
As an accessory an anti-theft protection for socket devices is available (Art. No. 300946). It protects the device against unauthorised removal and also serves as child protection, ideal for public areas, basements, garages or commercial installations. The device itself has no options.
Warranty, guarantee and disposal
The GX-D33 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, even beyond the statutory warranty.
The GX-D33 must not be disposed of with household waste. In accordance with the European Directive 2012/19/EU on waste electrical and electronic equipment (WEEE) it must be collected separately at the end of its service life and sent for environmentally sound recovery. Hand it in at a municipal collection point for electrical appliances (WEEE Reg. No. DE91394868). Further information is available from your city or municipality. Also dispose of the packaging material in an environmentally friendly way and, if possible, recycle it.
Why the GX-D33 is suitable
Designed for leaks
Alarm thresholds for technical CO₂ systems, not for normal room air.
Standards-oriented
Thresholds based on DIN 6653-2 for beverage dispensing systems.
Maintenance-free
NDIR sensor with automatic calibration every 7 days.
Unmistakable
Loud signal tone and red alarm LED in two stages.
Plug & Play
Plug in, wait about 3 minutes, protected.
Always in view
CO₂ concentration in % on the display.
No battery
Operation directly via the Schuko socket.
From the manufacturer
Made in Germany, 5-year guarantee registerable, repair and spare parts directly from the manufacturer.
Areas of application
- Beverage dispensing systems in hospitality and bars
- Water carbonators in office tea kitchens and pantries
- Rooms with CO₂ compressed gas cylinders
- Dry ice storage and rooms with dry-ice application
- Cooling rooms and technical rooms
- Small businesses with tea kitchen and large cylinder
- Mobile carbonators and mobile kitchens with CO₂ cylinder
- Wherever a Schuko socket is available in the lower part of the room
The Schabus CO₂ Detector GX-D33: because good air knows no compromises.
Frequently asked questions
For which applications is the GX-D33 suitable?
The GX-D33 monitors the carbon dioxide concentration (CO₂) in indoor rooms. It is particularly suitable for areas with CO₂ cylinders, beverage dispensing systems, water carbonators as well as certain cooling and technical rooms. CO₂ monitoring can also be useful when using dry ice.
From which CO₂ concentration does the GX-D33 trigger an alarm?
There are two stages: the pre-alarm starts at 1.5 vol.% CO₂ (15,000 ppm) with red LED and acoustic double tone. The main alarm starts at 3.0 vol.% CO₂ (30,000 ppm) with flashing red LED and loud interval signal. The current concentration is additionally shown in the display.
Why does the GX-D33 not trigger an alarm with normal room air?
The alarm thresholds are specifically matched to technical leaks and lie well above the normal CO₂ load in indoor rooms. Exhaled air from persons therefore does not trigger an alarm.
At what height should the GX-D33 be installed?
CO₂ is heavier than air and collects near the floor when ventilation is insufficient. Therefore plug the device into a socket in the lower part of the room; for dispensing systems about 30 cm above the floor. Keep at least 30 cm distance from edges, corners and the floor. In corners dead-space formation can occur that delays the alarm.
How long does it take until the GX-D33 is ready for operation?
After plugging in, an LED light sequence runs from top to bottom. Then the green Operate LED flashes for about 3 minutes while the software version is shown in the display. When the LED lights continuously and the display shows a % value, the device is ready for operation. During the warm-up phase the sensor is not yet active.
How do I test the GX-D33?
Press the test button: all LEDs light, a continuous beep sounds and the display shows “D33”. In addition, briefly blow exhaled air onto the air inlet slots. If the reading changes, e.g. to 0.58 %, the sensor is reacting. At least one test per month is recommended. The button test alone says nothing about the condition of the sensor.
Does the sensor need to be calibrated?
No, the sensor calibrates itself automatically every 7 days. In doing so it uses the lowest measured CO₂ value as reference for 400 ppm (0.04 %). Therefore ensure adequate fresh-air supply for at least 30 minutes every day, e.g. by window ventilation.
How long does the sensor last?
The expected service life of the NDIR sensor is about 10 years. It increases significantly if the device is operated in a regularly well-ventilated room. The sensor is maintenance-free.
What happens after the pre-alarm and after the main alarm?
When the CO₂ concentration falls again below the pre-alarm value, the device returns to normal operation. In the main alarm the alarm remains active until the concentration has fallen significantly. You can mute the alarm tone with the test button. At the next threshold change it is active again.
What does it mean when the yellow LED flashes?
If the yellow Error LED flashes and a beep sounds about every 30 seconds, a sensor or device fault may be present. Unplug and plug the device in again. If the fault persists, contact Schabus Support and send the device in only after consultation.
What to do if all LEDs are off?
Check the power supply. The socket may be without power. If the device remains off, it may be defective and must be sent to Schabus for checking.
What to do with implausible values on the display?
The green LED lights but the display shows implausible values: possible cause is sensor drift after a longer period of operation. Operate the device in fresh air until the reading shows 0.04 % again. If the value remains higher, operate it for 7 days in a room with plenty of fresh air, not directly in outdoor air. After that 0.04 % should be displayed again.
Can the GX-D33 also detect other gases?
No. The GX-D33 is designed exclusively for carbon dioxide (CO₂). It does not detect carbon monoxide (CO), natural gas or liquefied gas. Suitable gas warning detectors are required for those.
What is the difference between GX-D33 and GX-D3?
The GX-D33 has an integrated CO₂ sensor and is plugged directly into a socket. With the GX-D3 the sensor is outside the device and connected via a 2.5 m cable. This allows the measuring point with the GX-D3 to be positioned independently of the socket.
Does the GX-D33 need batteries or complex installation?
No. It is operated directly via a suitable 230 V Schuko socket; batteries are not required. As the sensor is integrated, no sensor cable needs to be laid.
Do I need to involve anyone before installation?
For beverage dispensing systems and other technical systems different requirements apply depending on the federal state and application. Involve the competent employers’ liability insurance association and the trade supervisory authority before installation so that acceptance is not obstructed.
How long is the guarantee valid?
The statutory warranty of at least 2 years applies in the EU. In addition the manufacturer Schabus offers a 5-year guarantee that can be registered online.
Questions about the CO₂ Detector GX-D33?
Our support team in Germany advises you free of charge on selection, installation and configuration.
GAS ALARM GX-D33 – Specially Designed for Kitchenettes with Carbonators
The GX-D33 is a CO₂ gas detector specifically developed for use in kitchenettes, pantry areas, and rooms equipped with carbonators. Thanks to its integrated NDIR infrared sensor, the device reliably detects elevated CO₂ concentrations and provides early warning of potential hazards.
Technical Data
- Operating voltage: 230 V AC (±10%), 50–60 Hz
- Power consumption: max. 3 VA
- Protection rating: IP 20
- Sound pressure level: < 90 dB (at 10 cm distance)
- Display: LED indicators (green = operation, yellow = fault, red = alarm)
- Warm-up time: approx. 3 minutes
- Dimensions (H×W×D): 118 × 60 × 44 mm
Environmental Conditions
- Operating range: 0 °C to +40 °C
- Storage temperature: -20 °C to +70 °C
- Humidity: 5–90 % rH (non-condensing)
Sensor & Alarm
- Sensor type: internal NDIR infrared sensor
- CO₂ trigger concentrations:
– 1.5 % pre-alarm
– 3.0 % main alarm
according to DIN EN 6653-2
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
