Gas Alarm GX-C300S Carbon Monoxide Detector + External Sensor

GX-C300S Gas Alarm: Dual Protection for CO and Natural Gas with Automatic Shutdown – TÜV Certified, Relay Controlled

A boiler room presents two hazards: leaking natural gas and deadly carbon monoxide.

The GX-C300S from Elektrotechnik Schabus GmbH & Co. KG handles both – with a TÜV-tested internal CO sensor (DIN EN 50291) and an external GX-SE sensor for methane, propane, butane, and ethanol. The clear-text display shows CO concentration in ppm and system status; when an alarm is triggered, the relay drops out – immediately shutting off the heating system, boiler, or solenoid valve.

A second relay reports faults (cable break, sensor error). Audible and visual alarms, 110–230 V power supply, wall mounting with four screws. The intelligent sensor system minimizes false alarms. Ideal for boiler rooms, commercial kitchens with open gas fittings, CHP units, or biogas plants. Installation by qualified personnel required. Made in Germany – the GX-C300S is your active safety center for technical environments.

The GX-C300S technology provides dual precision: the internal electrochemical CO sensor (TÜV-tested according to DIN EN 50291) measures with ppm accuracy and intelligently prevents false alarms. The external GX-SE catalytic sensor detects flammable gases (CH4, C3H8, C4H10) – ideal for gas pipes and fittings.

When alarm or fault conditions occur, two potential-free changeover relays (max. 5 A) switch: one cuts off gas supply, while the other communicates with building management or home automation systems. The display continuously shows operating status, CO ppm levels, and faults. The integrated switch-mode power supply ensures low power consumption. The GX-C300S meets TRGS 900 and F-Gas regulations (with optional GX-CFC) and serves as the intelligent interface for ventilation control or shut-off valves. More than just a detector, it is active risk management – documentable, reliable, and standards-compliant.

The GX-C300S is more than a device – it is the guardian of your boiler room. Whether it’s a gas boiler in a family home, an open gas cooker in a restaurant, a CHP system in industry, or a biogas plant: a leaking pipe, a faulty burner, or a blocked exhaust – the GX-C300S reacts instantly.

Owners meet legal requirements, technicians prevent downtime, and homeowners protect lives. The automatic shutoff prevents explosions and poisoning, while the display provides a clear operational log. Its robust construction, automatic self-test, and German engineering make the GX-C300S a long-lasting safety solution in demanding environments. It’s the difference between “everything under control” and “glad we shut down in time.” With the GX-C300S, you invest in control – control that protects.

The GX-C300S at a Glance:

• Dual sensing: Internal CO sensor (TÜV DIN EN 50291) + external GX-SE (methane, propane, butane).
• Automatic shutdown: Relay de-energizes – stops heating system, solenoid valve, or gas flow.
• ppm-accurate display: Clear-text LCD – continuous overview of CO and system status.
• 2 relays: Alarm (5 A) + fault – for BMS, ventilation, or shutoff control.
• Intelligent false alarm prevention: Software-controlled – reacts only to real hazards.
• Wide operating range: 110–230 V, wall-mountable, includes four screws.
• Expandable: Optional GX-CFC for CFC detection – complete refrigeration system protection.
• Made in Germany: Highest quality, service, and durability by Schabus.

Applications: Where the GX-C300S Provides Dual Safety

The GX-C300S ensures active dual protection in all technical and commercial environments with gas combustion:

• Boiler rooms & gas transfer stations: Shuts down in case of CO emissions or gas leaks at fittings.
• Catering & gastronomy: Open gas cooking systems – protects staff and guests.
• CHP units & biogas plants: Monitors combustion and leaks – plant protection included.
• Refrigeration systems: With optional GX-CFC – full protection against CO and CFC leaks.
• Utility rooms: Gas cylinders and heaters – automatic lockout.
• Smart Home & BMS: Relay integration – automated response.
• Industry & warehouses: Tracks process gases and forklift emissions – compliance guaranteed.

With the GX-C300S, protection starts in the boiler room – and doesn’t end with the alarm. It is the TÜV-certified, dual-sensor solution for anyone using gas who refuses to take risks. The automatic shutdown, ppm-accurate measurement, and German engineering make it an indispensable safety component.

Scope of Delivery:

• GX-C300S CO warning device with pre-mounted cable and PG fitting for external GX-SE sensor (for natural gas, propane, butane, ethanol).
• User manual for GX-C300S and instructions for SE / CFC sensors.
• 1 small & 4 large screws, matching wall plugs.
• Gland fittings: 1 small (Re2) & 2 large (R1 / 230V~).

Safety Instructions

• Before installation or operation, read the user manual carefully.
• Packaging material is not a toy. Keep away from children.
• The GAS ALARM GX-C300 may only be installed on a wall in dry indoor locations. Mounting height should allow easy display readability while standing to ensure proper functioning.
• Important! All connection cables leading to the gas detector must be fixed as surface-mounted lines. The line to the external sensor must NOT be extended!

Intended Use

• The GAS ALARM GX-C300S is a carbon monoxide warning device with an integrated electrochemical CO sensor and an external sensor for town and natural gas, suitable for residential and technical rooms.
• The LCD display continuously indicates both operating status and the exact CO concentration in ppm in the ambient air.
• The alarm is both visual and acoustic for CO and CH4; simultaneously, a potential-free relay switches.
• A second potential-free relay triggers in case of technical faults.
• The CO sensor, measuring cell, processing unit, and software have been fully tested and certified to DIN EN 50291 by TÜV Süd, confirming the unit’s safety and stability.
• The device is designed for fixed installation and is not suitable for use in explosive atmospheres.
• Use for any purpose other than that described is not permitted.