Crowcon Gasmonitor Plus Control Panel

  • Suitable for Onshore and offshore
  • Microprocessor-controlled unit
  • Deployed worldwide

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Gasmonitor Plus is Crowcon’s flexible 19″ rack-based control system for gas detection monitors. Monitor up to 16 gas detection monitors or 32 fire zones per rack. Racks can be supplied separately or built into wall mounting or floor-standing enclosures.

A separate gas level display is provided for each gas monitor. The Gasmonitor Plus can be engineered into large systems and tailored to suit individual site requirements.

Simple to use

  • All day-to-day functions are available from the front panel – push buttons for simple operation
  • Unique bar-graph display per channel – provides an instant representation of gas concentrations
  • Common alarm LEDs on the display card – the whole rack status can be checked at a glance

Flexible architecture

  • The system is limitlessly expandable
  • Modular construction – ultimate customisation and minimal wiring
  • Industry-standard analogue outputs – will integrate fully with existing rack-mounted protection systems on-site
  • Optional relay modules – flexible and cuts down on configuration and monitoring cabling

Easy maintenance

  • Each channel is inhibited separately – plant safety is not compromised during checks
  • Routine calibration from the front panel – reduces service overheads by half
  • One universal gas card – reduces spares holding

Each Gasmonitor Plus rack consists of a display module, a card frame that will accept up to sixteen input modules, an input/output module, a data logger and software. Input modules, relay modules and module membrane labels must be ordered separately.

The operating voltage of the rack is 24Vdc. 100/230Vac power supplies and backup batteries must be ordered separately.

Backup batteries are available as an option to ensure the system remains operational if mains power fails. Dedicated 24 V alarm outputs power a maximum of two audible/visual alarms per rack. Additional alarm devices can be activated using relay modules.

Order Information

Gasmonitor Plus
GMON 19″ Rack-Based Control System
S01718/3 Universal gas detector input module
S01405/3 Twin zone fire input module
Input module membrane switches and blank channel labels (must be ordered separately)
E01762 Gasmonitor Plus universal input channel module membrane switch (blue/white)
E01763 Gasmonitor Plus fire module membrane switch (blue/white)
E01772 Gasmonitor Plus methane module membrane switch (blue/white)
M05732 Gasmonitor Plus blanking label (blue/white, one required for each un-used channel)
Power Supplies (required if the system is to be mains powered)
E01547 24V 300W power supply 100-260Vac
E01675 24V 500W power supply 100-260Vac
2171/1 24V 750W power supply 100-260Vac
Optional items
S01404 Relay output module (eight DPCO relays per module)
M02186 RFI screening plate – used when the rack is not supplied in an enclosure. 2 plates are required.
M010006 Motherboard RFI screening cover, use in combination with above.
S011793 Inhibit module. Provides a 24Vdc output per channel to indicate when inputs are in an inhibit state. Lead time four weeks.
Batteries for system backup in the event of mains-failure
E01006 Battery 12V 7Ah lead/acid
E01011 Battery 12V 17Ah lead/acid
E01007 Battery 12V 24Ah lead/acid
E01315 Battery 12V 38Ah lead/acid
E01316 Battery 12V 65Ah lead/acid
Gasmonitor Plus is a 24Vdc system and requires two of the above batteries in series.
Battery charger assembly
A Gasmonitor Plus rack system can charge batteries up to 17Ah capacity. For larger batteries or for multi-rack systems, a separate charger assembly is required. The assembly is supplied on an aluminium plate, which fits into the wall-mounted enclosures’ swing door. The module comprises a mains surge suppressor, battery charger, deep-discharge module (to protect the batteries) and terminals for connecting up to four racks. The operating voltage for the charger must be specified (110 or 230Vac). A suitable power supply (for powering the Gasmonitor system) and batteries must be selected separately. Contact Crowcon for 2 rack 2x17Ah systems.
00144A Battery charger assembly

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Title Size
Gasmonitor-Plus-datasheet 237 KB
Gasmonitor-Manual-Iss-9-Sept-18 4 MB
SIL-Declaration-Gasmonitor-Plus 109 KB


Size 483 x 133 x 294 mm (19.0 x 5.25 x 11.5 ins)
Weight 9.5 kg (21 lbs)
Enclosure material Aluminium alloy
Mounting Rack mounted (3u format).  Wall-mounted and floor-standing cabinets are optional—dimensions on request.
Channels 16 per rack
Operating temperature 0°C to +50°C (32°F to +122°F)
Humidity 0-95% non-condensing
Inputs Gas    2 or 3 wire 4-20mA (sink or source), or mV bridge
Fire – smoke & heat detectors, manual call-points   Maximum of 32 loops per rack (i.e. 16 twin zone fire modules)
Outputs Analogue 16 x 4-20mA, max. load 960 Ohms or 1-5 V, min. load 100 Ohms
External audible/visual alarm drive Powered 24 V dc, max load up to 200mA for each alarm level.
Relays Type Up to 84 DPCO contacts rated 5 A @ 250 V ac, non-inductive load
Assignment – Common Alarm 1, Alarm 2, Alarm 3, Fault
– Per channel Gas alarms 1, 2 & 3, fire &
– Voting Up to 16, configurable
– Relay modes Energised/de-energised,
latched/non-latched, time-delayed, pulsed
Digital communications With PanelsPro or SetGMon only
Event logging Built-in datalogger – data available via communication links with PanelsPro or SetGMon only
Panel indication Channel number: 4 lines x 20 characters
Gas reading: On main LCD plus green LED bar-graph on channel card
Measurement units:  % LEL, ppm, % Vol, Fire
System fault – integrity watchdog:  Yellow LED
Alarm indication As standard: 3 individual & 3 common alarms (red LED); Fault – individual & common fault (yellow LED); Inhibit – individual inhibit (yellow LED)
Power AC mains: 100 – 260 V ac 50/60 Hz external
DC: 27.6 V
Battery backup: external
Approvals Low voltage directive – EN61010-1
EMC Directive – EN 50082-1
EMC Directive –  EN 50081-1EN 50270, EN61000-6-4ATEX: Conforms to EN60079-25 in configuration with Zener Barrier Baseefa 05Y0090/1

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