Crowcon Multiscan++S1

Crowcon Multiscan++S1 is a SIL1 certified gas detection control panel designed for high functional safety in critical environments. ATEX certification to EN IEC 60079 standards makes it suitable for use in classified hazardous areas, while its architecture is equally suited to non-classified plant rooms and control centres. Typical applications include industrial plants, marine vessels, medical facilities, universities and laboratories where continuous gas monitoring is business-critical and downtime must be minimised.

By centralising detector management into a single control point, the panel supports structured safety system design, clear alarm handling and consistent cause-and-effect logic across entire sites.

The Multiscan++S1 range covers installations from compact systems to large, distributed networks. Versions with 16, 32, 64, 128 and 256 channels enable standardisation on a single panel family across multiple projects and sites. Each panel can manage and monitor up to 256 gas detectors, supporting both local and remote detection zones.

Very high output capacity – up to more than 500 freely programmable outputs via remote modules, plus on-board relays – allows precise control of alarms, ventilation, shutdowns and other safety-related actions. This flexibility supports detailed cause-and-effect strategies tailored to the specific risk profile of each area, without redesigning the core control platform.

Multiscan++S1 supports both addressable detectors on RS485 buses and 4–20 mA analogue detectors, allowing new projects and retrofit upgrades to be handled on the same platform. Up to four open or two closed galvanically isolated RS485 (EIA-485) buses provide resilient communication in electrically noisy or large-scale plants.

The panel accepts up to 256 addressable inputs via RS485 and/or 4–20 mA inputs via remote modules, with eight 4–20 mA inputs available on-board for direct connection. Support for Galileo or Modbus protocols for field communication, plus Modbus for higher-level supervision, simplifies integration with third-party systems. An optional TCP/IP interface enables LAN connectivity and remote monitoring over Ethernet for centralised supervision from control rooms and maintenance hubs.

To match different installation philosophies, Multiscan++S1 is available either in an IP65 ABS wall-mount enclosure or as a 19″ 6U rack-mount unit. The wall-mount version includes an integrated 27.6 Vdc, 4 A power supply with space for backup batteries, reducing external hardware and improving resilience during power interruptions. The rack variant uses an external 24 Vdc supply, making it easier to integrate into larger control panels or centralised racks.

Wall-mount units are supplied with mounting brackets and preformed cable entry points to simplify mechanical installation and cabling. Auxiliary power outputs are available to supply detectors and remote modules directly from the system. Relay outputs rated for high loads support direct actuation of field devices such as beacons, sounders or shutdown actuators, reducing the need for additional interface hardware where appropriate.

A powerful microprocessor underpins extensive self-diagnostic and self-testing routines that run continuously in the background. These routines help detect and localise faults in detectors, wiring and modules quickly, reducing troubleshooting time and supporting high system availability. Remote detectors and I/O modules are efficiently supervised so that communication issues and device failures are clearly identified.

The control unit maintains an internal event log that can be viewed from the front panel or downloaded to a PC via the RS232 serial port and Sensitron software. Higher-capacity models provide a parallel printer port for local hard-copy event printing, supporting incident review and record-keeping. An internal real-time clock with backup maintains accurate time-stamping through power interruptions, improving traceability for audits and investigations.

The front-panel LCD graphic display provides clear visualisation of system status, alarms and configuration parameters. Eighteen status LEDs, arranged in a double 9-LED row, offer immediate visual indication of alarms, faults and operating states, while an integrated buzzer (approx. 60 dB at 1 m) provides acoustic alerting at the panel itself.

A keypad with numerical and directional keys enables straightforward navigation, configuration and acknowledgement. Three password-protected operating levels control access to configuration and maintenance functions, helping to protect system integrity and restrict changes to authorised personnel. Individual channels or detectors can be set or unset to facilitate planned maintenance, and on-board channel test functions allow verification of detector operation and panel response during commissioning and routine checks.

Configuration and programming are carried out via Sensitron software, allowing rapid initial set-up, configuration cloning between panels and straightforward firmware updates over the RS232 port. Modular I/O expansion via dedicated input and output modules (such as STG/IN8S, STG/OUT16S or STG/IN4-OUT4-S1) allows capacity and functionality to be scaled as the site evolves. Optional relay expansion boards, for example STG/8REL, convert open-collector outputs into relays to match field device requirements.

Remote units with local relays and LCD displays enable distributed event visualisation, placing status information and basic control closer to the point of risk while maintaining centralised oversight. Combined with Modbus and optional TCP/IP integration, this supports flexible architectures from single-panel systems to multi-panel, multi-area installations.

Multiscan++S1 is designed for reliable operation in demanding environments, with operating and storage temperature ranges and humidity tolerance that suit industrial and marine applications. The IP65-rated enclosure option offers strong protection against dust and water jets, and compliance with EMC standard EN 50270:2015 supports stable operation in electrically harsh locations.

An extensive accessory ecosystem – including power supplies, interface converters, IP-rated boxes and serial boards – allows system designs to be tailored without fragmenting the installed base. Backed by a global manufacturer within the Halma group, the Multiscan++S1 series provides a consistent control architecture across models and system sizes, simplifying training, maintenance and lifecycle support.