Crowcon TXgard Plus

Crowcon TXgard Plus is designed as a fixed detector for monitoring toxic gas and oxygen hazards in industrial areas that are classified due to the presence of flammable gases or vapours. Its flameproof (Ex d) enclosure and explosion-proof marking for high gas group environments support deployment in Zone 1 and Zone 2 hazardous areas and equivalent international classifications. ATEX, IECEx and UL certifications, together with compliance with recognised gas detection and EMC standards, provide assurance for duty holders responsible for safety-critical installations.

The detector combines a marine-grade aluminium junction box with a 316 stainless-steel sensor housing to deliver long-term mechanical strength and corrosion resistance. IP65-rated weatherproofing supports reliable performance in harsh outdoor locations as well as demanding indoor process areas. A compact footprint and rugged 2.2 kg build facilitate mounting on pipework, skids and structures where space, access and cable routing are constrained.

TXgard Plus uses electrochemical sensors to monitor toxic gases such as carbon monoxide and hydrogen sulphide, alongside oxygen, across a wide selection of gas types and measurement ranges. Typical performance characteristics include good repeatability and low zero drift, helping to maintain stable readings, support alarm integrity and reduce nuisance activations. Versions within the TXgard Plus platform can also be configured with catalytic bead sensors for the detection of flammable gases and vapours, enabling common hardware to be applied across different hazard types where appropriate.

The broad sensor portfolio allows standardisation on a single detector platform across multiple process units, simplifying engineering design, reducing spares inventory and supporting consistent procedures for commissioning and servicing. Long-life electrochemical sensors further contribute to a lower total cost of ownership by extending replacement intervals in high-utilisation facilities.

A back-lit LCD display on the detector presents real-time gas readings and status information directly at the point of detection. The integrated status LED provides an at-a-glance indication of normal operation, alarm or fault conditions during routine patrols, enabling quicker identification and response. Back-lighting improves readability in low-light or enclosed plant areas, supporting safe operation during both day and night shifts.

Local buttons, combined with the display, allow authorised personnel to perform zero and span adjustments at the detector head. This local interaction supports routine bump testing and calibration checks, helping to verify sensor response and maintain safety integrity between full service visits.

TXgard Plus is engineered for straightforward operation and maintenance by on-site teams. Non-intrusive one-person calibration is achieved using magnetically operated buttons, so the flameproof enclosure remains closed and live terminations are not exposed. This approach helps reduce the need for hot work permits, minimises disruption in hazardous areas and shortens the time detectors are unavailable during service activities.

Plug-in style sensor heads, amplifier boards and associated components simplify replacement and reconfiguration, supporting long-term serviceability over the life of the plant. A range of spares and accessories, including flow and calibration adaptors, weatherproof caps and spray deflectors, allows installations to be tailored to local ambient conditions and sampling arrangements while maintaining common detector hardware across the site.

Crowcon TXgard Plus provides a 4–20 mA analogue output that can be configured as either current sink or source, enhancing compatibility with a wide variety of control panels, DCS and safety PLC architectures. The 3-wire connection format and terminal block suitable for common industrial cable sizes support straightforward wiring, while multiple cable entry options accommodate regional gland standards and installation practices.

Optional alarm and fault relays enable direct actuation of local sounders, beacons or shutdown devices, or provide hardwired signals into higher-level safety systems. Versions are available with or without on-board relays to align with specific system designs and budget preferences. The detector integrates with a broad selection of Crowcon control panels and many third-party systems via the standard 4–20 mA interface, making it suitable for both standalone installations and large distributed gas detection networks.

TXgard Plus has a proven track record in continuous 24/7 operation across industries such as oil and gas exploration, chemical processing, water treatment and steel production. It is also deployed in automotive and aerospace manufacturing, research facilities and other high-utilisation medical, civil or commercial plants where continuous gas monitoring and limited access windows place a premium on reliability and service efficiency.

Operating temperature and humidity capabilities align with typical plant conditions, while global hazardous area and EMC approvals, together with comprehensive documentation, support deployment in international projects with standardised safety requirements. This combination of robust construction, flexible sensing options, straightforward maintenance and wide system compatibility positions Crowcon TXgard Plus as a long-term fixed gas detection solution for complex industrial environments.