GX-CO2-30 Carbon Dioxide Gas Sensor
€200.84
The active CO₂ sensor for technical systems: independently warning or as an external sensor for GX-A1+ and GX-HS
The Schabus CO₂ Sensor GX-CO2-30 is an active carbon dioxide sensor for monitoring CO₂ from technical systems. It detects leaks in rooms with beverage dispensing systems, wine cellars, cold rooms, breweries and storage rooms with CO₂ pressurized cylinders, as well as high CO₂ concentrations during the processing and storage of dry ice. An NDIR sensor (non-dispersive infrared measurement technology) measures CO₂ selectively and without cross-sensitivity to other gases.
The GX-CO2-30 operates independently: status LEDs indicate operation, fault and alarm, an integrated buzzer reports alarms directly at the sensor, and the test button allows the function to be checked. This means the sensor can also be used mobile and without a gas warning device. In addition, it provides an analogue output signal and is connected as an external sensor to the Schabus gas warning devices GX-A1+ and GX-HS. There, a potential-free relay switches, for example, ventilation systems, external alarm devices, solenoid valves or the building management system.
The alarm thresholds are matched to technical leaks: pre-alarm at 1.5 % CO₂ (15,000 ppm), main alarm at 3.0 % CO₂ (30,000 ppm). They are deliberately set significantly higher than the values of indoor air sensors so that normal exhaled air does not trigger false alarms. The sensor is oriented towards the requirements of the beverage dispensing systems ordinance.
Important note: The GX-CO2-30 is intended for warning of high CO₂ concentrations that can occur in the vicinity of beverage dispensing systems and the processing and storage of dry ice. It may only be used in dry rooms where people regularly stay, and not in potentially explosive atmospheres. Installation must be carried out by a qualified specialist.
Note on TRGS: The GX-CO2-30 is oriented towards the requirements of the beverage dispensing systems ordinance and the TRGS. However, it does not replace a fully certified TRGS system.
Measure, warn, forward
The GX-CO2-30 combines NDIR measurement technology with an alarm sounder, status LEDs and an analogue output signal for the gas warning devices GX-A1+ and GX-HS.
For technical CO₂ systems
Monitors dispensing systems, wine cellars, cold rooms, breweries, dry ice storage and all gas systems with CO₂ from cylinders.
NDIR measurement technology
High selectivity for CO₂, no cross-sensitivity to other gases, long-term stable and low-maintenance.
Adapted alarm thresholds
Pre-alarm at 1.5 % CO₂, main alarm at 3.0 % CO₂. Normal exhaled air does not trigger an alarm.
Active sensor
With its own evaluation circuit that converts the measured concentration into a signal for the Schabus gas warning devices.
Optical and acoustic alarm
LED indicators for operation, fault and alarm as well as an integrated buzzer directly on the sensor.
Test button
For quick functional testing directly on the sensor.
For GX-A1+ and GX-HS
Can be used as an external sensor; the relay in the warning device switches ventilation, solenoid valves, alarm devices or the building management system.
Also usable mobile
The sensor can be operated independently without a gas detector.
Splash-proof
Robust design with integrated protective membrane that additionally protects the electronics from moisture.
What’s in the box
The sensor is supplied with a connected cable. The device has no options and no additional variants.
- CO₂ sensor GX-CO2-30 (active carbon dioxide sensor)
- Connection cable, 6 m long, permanently attached to the sensor
- 2 mounting screws and wall plugs
- Operating instructions
The associated gas warning device GX-A1+ or GX-HS is not included in the scope of delivery.
How the GX-CO2-30 is constructed
Measuring cell, evaluation, display and alarm sounder are housed in a compact, black plastic enclosure. The enclosure is mounted on the wall; the cable leads to the warning device.
Compact enclosure
The enclosure has ventilation slots through which the room air reaches the sensor element. The slots must remain free of dust and must not be covered. It is mounted with the supplied screws and wall plugs.
NDIR sensor element with protective membrane
It measures the CO₂ concentration according to the principle of non-dispersive infrared measurement. An integrated membrane protects the electronics from moisture.
Evaluation circuit
It converts the measured gas concentration into a sensor voltage that is processed by the Schabus gas warning devices. The thresholds for pre-alarm and main alarm are matched to this. A value of 400 ppm CO₂ corresponds to the zero point of the sensor in normal fresh air.
Status LEDs
Three LEDs indicate the status: green for operation, yellow for a fault (Error) and red for the alarm. During preheating the green LED flashes; when the sensor is ready for operation it lights continuously.
Integrated buzzer
It reports pre-alarm and main alarm acoustically directly at the sensor.
Test button
For quick functional testing so that the sensor is also operational and testable without a warning device.
Connection cable
A three-core, 6 m long cable is permanently connected to the sensor. It leads to the gas warning device GX-A1+ or GX-HS and can be extended if required.
Calibration sticker
On the underside of the sensor is the date (month/year) of the next sensor calibration.
Two levels, two signals
Depending on the CO₂ concentration, the GX-CO2-30 warns in two stages. The thresholds are matched to technical leaks and are deliberately higher than those of indoor air sensors.
Normal operation
The green LED is lit; the sensor is ready for operation. Fresh air has about 400 ppm (0.04 %) CO₂.
Pre-alarm from 1.5 %
From 1.5 % to 3.0 % CO₂ (from 15,000 ppm) the LED flashes alternately green and red, the buzzer beeps.
Main alarm from 3.0 %
From 3.0 % CO₂ (from 30,000 ppm) the green LED lights, the red LED flashes and the buzzer beeps.
On the gas warning device GX-A1+ or GX-HS the respective relay switches in the event of pre-alarm and main alarm. The sensor reacts very quickly to its environment. The warning device reacts rather slowly due to its plausibility checks to avoid false alarms; this is not a fault. Further information can be found in the operating instructions of the respective warning device.
Together with GX-A1+ and GX-HS
The GX-CO2-30 is an accessory for the Schabus gas warning devices GX-A1+ and GX-HS and can be connected there as an external CO₂ sensor.
Ventilation systems
The relay in the warning device can activate forced ventilation.
Solenoid valves
The gas supply can be shut off automatically in the event of an alarm.
External alarm devices
Additional signal devices extend the alarming in the room.
Building management system
The alarm message can be forwarded to the building management system.
How to connect the sensor to the GX-A1+ or GX-HS can be found in the operating instructions of the respective warning device. Gas warning device and sensor are always put into operation together.
Correct placement and commissioning
The sensor may only be installed in dry indoor rooms. Be sure to observe the prescribed mounting height so that proper functioning of the warning device is ensured. Installation must be carried out by a qualified specialist.
Placement of the sensor
30 to 40 cm above the floor
Escaping CO₂ is heavier than air and sinks to the floor. Therefore mount the sensor at a height of 30 to 40 cm above the floor.
Close to the system
The sensor should not be more than 4 metres away from the technical system to be monitored.
Never above nose height
In the case of special requirements the sensor may be mounted higher, but never above the average lowest nose height of the people working in its vicinity.
These locations are not suitable
- Places that could prevent alarm triggering in the event of a gas leak, e.g. behind curtains, in cupboards, behind stacked barrels or beverage crates
- Next to a door, windows, ventilation, fan, air conditioning, etc. (draught)
- In areas with constantly high or condensing humidity
- In potentially explosive atmospheres
Extending the cable
- The cable is 6 m long as standard
- For extension use a 3-core cable
- The required minimum cross-section depends on the length of the cable; the details can be found in the operating instructions
- The manufacturer recommends the control cable LIYY (Art. No. 300780) for extension
Commissioning
- Connect the sensor to the gas warning device and put the device into operation. Gas warning device and sensor are always started together.
- After applying the supply voltage the sensor electronics perform a self-test. The green LED flashes, the sensor preheats. The preheating time is approximately 5 minutes.
- As soon as the sensor has reached the required operating temperature, the green LED lights alone. The sensor is ready for operation.
Note: Even after a power failure, self-test and warm-up time are restarted.
Test the function regularly
For your safety the manufacturer recommends performing the simple functional test at least twice a year.
Simple functional test with sparkling water
- Shake a half-full bottle of sparkling water briefly.
- Hold the bottle neck directly in front of the sensor and open the screw cap.
- The escaping carbon dioxide causes the sensor voltage on the display of the GX-A1+ to rise by a few tenths of a volt. This is not enough for an alarm, but shows that the sensor is responding.
Never spray the sensor with pure carbon dioxide, for example from catering cylinders. This could permanently impair the accuracy of the evaluation circuit. In case of doubt contact Elektrotechnik Schabus and have a factory inspection carried out.
Alarm test with exhaled air
- Hold your face about 10 cm in front of the sensor and continue breathing calmly, directing your breath into the centre of the sensor when exhaling.
- Inhale deeply several times and then gently blow into the sensor. Exhaled air contains about 4 to 5 % CO₂.
- The sensor needs about one minute to adjust to the new value. The value on the display of the warning device should rise slowly until the sensor triggers an alarm.
Real gas alarm test (optional)
This test is not technically necessary. You need a large glass. Pile about 1 gram of baking soda (sodium hydrogen carbonate) on one side of the glass and hang the operational sensor into it. Drip about 1 ml of vinegar essence (25 %) from a disposable syringe onto the baking soda and put the lid on without crushing the cable. After a few minutes the sensor voltage on the GX-A1+ rises slowly until pre-alarm and then main alarm are triggered.
Cleaning and care
- Clean the sensor regularly by blowing the dust away
- Avoid moisture. If the sensor gets wet, dry it soon with a cellulose cloth
- Avoid splash and rain water, dust and direct sunlight
- Clean the device only with a dry linen cloth; in the case of heavy soiling it may be slightly dampened
- Do not use solvent-based cleaning agents
- Do not open the device; it contains no parts that can be maintained by the user
Sensor calibration and replacement
To ensure proper function, the manufacturer recommends replacing the sensor after 5 years as a precaution or sending it to Elektrotechnik Schabus for factory inspection and zero-point calibration. The date (month/year) of the next calibration is on the underside of the sensor. Sending it in is more economical than a new purchase, and many parts can be reused for a new sensor, which benefits the environment.
Manufacturer’s notes
- Read the operating instructions carefully before installation and commissioning and keep them; they form part of the product
- Installation must be carried out by a qualified specialist
- Be sure to observe the prescribed mounting height of the sensor
- Packaging material is not a toy and does not belong in the hands of children
- Use only in dry rooms where people regularly stay
- Do not use in potentially explosive atmospheres
- The device is not approved for any use other than that described
- Intended for residential, commercial and industrial areas as well as small businesses such as workshops and restaurants, connected to the public low-voltage network
- Do not open the device; it contains no parts that can be maintained by the user
- The declaration of conformity is available for download on the manufacturer’s website
Warranty, guarantee and disposal
The GX-CO2-30 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 prerequisite is that the device has been used in accordance with the operating instructions.
The GX-CO2-30 must not be disposed of with household waste. The crossed-out wheeled bin symbol on the product reminds you to use the take-back systems so that the materials can be reused in an environmentally friendly manner 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-CO2-30 is suitable
Designed for leaks
Alarm thresholds for technical CO₂ systems, not for normal indoor air.
Independent
With buzzer, LEDs and test button operational even without a gas warning device.
Networkable
As an external sensor for GX-A1+ and GX-HS, with relay for ventilation, valves and building management system.
Precise measurement technology
NDIR sensor without cross-sensitivity to other gases.
Robust
Splash-proof, with integrated protective membrane.
Easy to install
Cable, screws and wall plugs are included; wall mounting.
Sustainable
Calibration and factory inspection at the manufacturer instead of new purchase; parts are reused.
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 gastronomy and bars
- Breweries, beverage logistics and bottling plants
- Wine cellars and vinotheques
- Cold rooms and storage rooms with CO₂ pressurized cylinders
- Dry ice storage and dry ice processing
- Technical rooms with CO₂ systems under pressure
- Food production with CO₂ atmosphere
- Large kitchens and canteens
- Research laboratories with CO₂ technology
- All gas systems with CO₂ from cylinders
The Schabus CO₂ Sensor GX-CO2-30: Because good air knows no compromises.
Frequently asked questions
For which applications is the GX-CO2-30 suitable?
The GX-CO2-30 warns of high CO₂ concentrations from technical systems under pressure as well as from the processing and storage of dry ice. Typical locations are beverage dispensing systems, wine cellars, breweries, cold rooms and storage rooms with CO₂ pressurized cylinders.
Can I operate the GX-CO2-30 without a gas warning device?
Yes. The GX-CO2-30 is an active sensor with its own buzzer, status LEDs and test button and can also be used mobile without a gas detector. For relay functions such as ventilation, solenoid valves or building management system you need the gas warning device GX-A1+ or GX-HS.
With which devices can the sensor be combined?
The GX-CO2-30 is used as an accessory with the Schabus gas warning devices GX-A1+ and GX-HS. How to connect the sensor can be found in the operating instructions of the respective warning device.
At what CO₂ concentration does the GX-CO2-30 trigger an alarm?
There are two levels: The pre-alarm starts at 1.5 % CO₂ (15,000 ppm), the main alarm at 3.0 % CO₂ (30,000 ppm). The thresholds are deliberately higher than those of indoor air sensors so that normal exhaled air does not trigger false alarms.
What do the LEDs on the sensor mean?
If the green LED flashes, the sensor is preheating or the system is starting. If it lights continuously, the sensor is ready for operation. If the yellow LED lights, there is a fault (Error). If the LED flashes alternately green and red and the buzzer beeps, the pre-alarm is active. If green lights and red flashes with the buzzer beeping, the main alarm is active.
At what height must the sensor be mounted?
At a height of 30 to 40 cm above the floor, but not more than 4 metres from the monitored system. CO₂ is heavier than air and sinks to the floor. If necessary the sensor may be mounted higher, but never above the average lowest nose height of the people in its vicinity.
How long does it take until the sensor is ready for operation?
After applying the supply voltage the sensor performs a self-test and preheats. The preheating time is approximately 5 minutes. As soon as the green LED lights alone, the sensor is ready for operation. After a power failure the process starts again.
How do I test the sensor?
Most simply with a half-full bottle of sparkling water: shake the bottle briefly, hold the bottle neck directly in front of the sensor and open the cap. The sensor voltage rises slightly; an alarm is not triggered. Alternatively there is an alarm test with exhaled air and a real gas alarm test with baking soda and vinegar essence. The manufacturer recommends the simple functional test at least twice a year.
May I test the sensor with pure CO₂?
No. Never spray the sensor with pure carbon dioxide, for example from catering cylinders. This could permanently impair the accuracy of the evaluation circuit. In case of doubt contact Elektrotechnik Schabus and have a factory inspection carried out.
Does the sensor need to be calibrated or replaced?
The manufacturer recommends replacing the sensor after 5 years as a precaution or sending it to Elektrotechnik Schabus for factory inspection and zero-point calibration. The date of the next calibration is on the underside of the sensor.
Can I extend the connection cable?
Yes, with a 3-core cable. The required minimum cross-section depends on the length of the cable; the values can be found in the operating instructions. For extension the manufacturer recommends the control cable LIYY (Art. No. 300780).
Is the sensor splash-proof?
Yes, the sensor is splash-proof and has an integrated protective membrane. Nevertheless you should not expose it to moisture permanently. If it gets wet, dry it soon with a cellulose cloth. It is not intended for areas with constantly high or condensing humidity.
Can the GX-CO2-30 also detect other gases?
No. The GX-CO2-30 is intended exclusively for carbon dioxide (CO₂). Thanks to NDIR measurement technology it has no cross-sensitivity to other gases.
Does the GX-CO2-30 replace a TRGS-certified system?
No. The sensor is oriented towards the requirements of the beverage dispensing systems ordinance and the TRGS, but does not replace a fully certified TRGS system.
May I install the sensor myself?
No. Installation must be carried out by a qualified specialist. Do not open the device; it contains no parts that can be maintained by the user.
How long is the warranty?
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 Sensor GX-CO2-30?
Our support team in Germany will advise you free of charge on selection, installation and configuration.
CO₂ Sensor GX-CO2-30
The GX-CO2-30 CO₂ sensor is an active sensor that can also be used as a mobile unit without a gas alarm device. It is suitable for precise measurement of carbon dioxide in various environments.
Technical Data
- Operating voltage: 12–24 V DC / > 150 mA
- Humidity (ambient): 5–90 % RH (non-condensing)
- Operating range: 0 °C to +50 °C
- Storage temperature: -20 °C to +60 °C
- Measuring range: approx. 400 ppm to approx. 5 % CO₂
- Measuring frequency: approx. 15 measurements in 10 seconds
- Accuracy: ± 100 ppm / ± 5 %
- Internal buzzer: > 82 dB @ 10 cm
- Service life: approx. 5 years (depending on environmental conditions)
- Sensor protection rating: IP 54
- Cable length: 6 m
- Cable cross section: 3 × 0.14 mm²
- Dimensions (H×W×D): 88 × 58 × 38 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
