GDS 305 – Sequential Gas Sampling System 1-48 Way

1-48 sample points
Monitor up to 4 gas types
No sample line purge delay
Wide range of sensor types
4 line alpha/numeric display
Selectable sample line sequence
Display of each sample line location
Easily installed and maintained
Full indication of all operations
Event logging / Modbus / RS232 / RS485
Line blockage and pump fail monitoring
Variable sample time for optimum cycle time
High integrity, comprehensive self check fault monitoring
Centralised one man calibration offers minimum running costs
Split system operation – optional
Line blockage, blow back – optional
Hazardous area operation – optional
Remote repeater panel – optional
LED/text indicator panel – optional
Auto flood cut off – optional
Enclosure internal gas monitoring with automatic system shutdown – optional
Sample line multiplier – optionalshutdown – optional

Application

The GDS 305 system is designed to monitor gas levels from a number of sample-points, targeted at situations where the positioning of conventional gas sensors may not be practical.
This may be due to equipment security, cable routing, access for detector head installation/maintenance, harsh environment or a cost effective means of monitoring designated hazardous areas, typically – tunnels, marine applications, underground/high level voids, process control, landfill, multi storey car parks, brewing, horticulture, retail.

Operation

Gas samples are sequentially extracted for a timed period by a central control unit via fixed sample lines. A high rate sample is taken by the main pump during which a reduced rate sample is passed across the sensor device.
The central unit provides gas level readouts with two alarm trip points per line, providing a range of signal outputs for annunciator and control functions.

Technical Data

Sensor Points	1-48
Sensors	1-4 4~20mA input
Measurements	Combustible gas L.E.L. % Vol Toxic gas P.P.M. % Vol Oxygen – % Vol Refrigerant – ppm Depletion/enrichment
Power Supply	230/115v AC 50/60 Hz 300W max
LED Indicators	System healthy Main power Standby power High gas alarm Low gas alarm System, flow, sensor fail Comms fail Skip/hold Sampling
Display	4 line alpha/numeric indicates all functions and status in text. Sample line locations (user settable)
User interface	8 panel mounted push buttons:- Reset, Scroll, Hold, Dim, Enter, Down, Up, Select PC – event log / data log, data to and from system controls

Relay Outputs	Global Low S.P.C.O. Global High S.P.C.O. Global Fault S.P.C.O. Flow Fail S.P.C.O. Power Fail S.P.C.O. Cabinet Sensor S.P.C.O. 32 programmable relays Additional 32 optional
Communication	RS232– Data Stream Modbus 2 x RS485 Can bus – internal
General	Audible alarm all alarm conditions LED/display dimming User/Eng password LCD backlight Event logging Sample line size 8mm OD 6mmID Nylon, PTFE, Copper, Stainless Steel. Max length 200m specials 300m+ Sample vent x 2-10mm Tubing entry enclosure base, side option Response time 15 to 45 seconds Colour- powder coat ash grey BSA01 Size 800H x 600W x 350D IP 63 Wall mount Weight 65kg
Standards	EN60945: 2002 Maritime general requirements EN61010: 2001 Electrical Safety – LVD