GDS202 brochure

• Toxic/Flammable/Refrigerant sensor combination• Standard Unit 1 - 10 Sensors• Four zone indicators• Single cable for multiple sensors• Individual Sensors with audible and visual warning alarms• Sensors pre-set and tested• Self diagnostic• Pre and full alarm indication• Two alarm relays• Wall or panel mount• Designed for ease of installation• System easily extended• Off the shelf systemTECHNOLOGIES LTD Flammable / Toxic / Refrigerant Gas AlarmApplicationThe GDS 202 gas leak detection system features a main control unit connected to remote sensors via a single 3 corecable. The control unit is of an advanced design using the latest technology and provides a high integrity system whilstenabling a significant cost saving over conventional gas alarm systems. Standard sensors for use in commercial and light industrial applications such as laboratories, workshops, boiler plantrooms etc are available for monitoring toxic, flammable or refrigerant gases. Each sensor incorporates a status LED andalarm sounder. Sensor types may be mixed and up to 10 in number for the standard control unit, or up to 20 when usedwith an optional auxiliary power pack. Alternatively sensors may be used separately without a control unit providing theyare powered by a 12 or 24volt DC supply.OperationOn power up, the green power indicator will flash for 3 minutes indicating that the sensors are stabilising, during thisperiod all alarm functions are held in the off condition.After the stabilisation period, any sensor detecting gas will provide a local visual (red LED) and audible alarm, at thesame time transmitting a signal to the control unit where a pre alarm is indicated by an intermittent audible alarm, with the red zone alarm LED flashing and the pre alarm relay changing state. Should the gas surrounding the sensorclear within 45 seconds the system will return to the normal operating condition. However, if the gas remains for longerthan 45 seconds, full alarm condition will occur and be indicated by the red alarm LED and sounder going constant aswell as the full alarm relay activating.The audible alarm may be silenced at any time but full alarm indication will be latched until the gas has cleared afterwhich the system may be reset by pressing the reset pad.ConstructionControl Unit - A two-part screw together polycarbonate enclosure houses the power supply alarm indicators, controlfunctions and alarm relays. The enclosure may be wall or panel mounted having cable entry from the rear, bottom, top or sides.Standard Sensors - Two-part push together plastic enclosure that may be surface mounted using two fixing points orattached directly to a standard conduit box, cable entry is from the rear. Hazardous area and special gas sensor - see data sheet C389.GDS202 Specification Sheetref C484ATechnical Data ref C484AControl UnitPower Supply 115/230vAC or 24vDC ± 15%The two voltages may be used at the same time (standby battery)Power Output 24vDC-200mA max. - auxiliary equipmentFrequency 50/60 HzConsumption 3 wattsDetector Head 1 to 10 Toxic and/or flammable sensorsIndicators Power - (Green LED)Pre alarm - (Flashing red alarm LED and intermittent sounder)non latchFull alarm - (Constant red alarm LED and sounder) - latching(option non latch)Fault - (Amber LED and sounder) Fault monitoring -sensor/sensor cable/control unit - non latchingSensor Cable 3 core 1 mm2Cable length - 200m maxAlarm Relays Pre alarm S.P.C.O (R L1)Full alarm D.P.C.O (RL2)Fault alarm S.P.C.O (RL3)Relays are de energised in non-alarm state (option-energised)All contacts rated - 5A@230v AC.Relay Inhibit: Front panel access Ambient Temp:Protection: IP65 Operation: -5 to +45°CWeight : 920 gms Storage: +10 to +60°CDimensions: L 200mm x H 120mm x D 58mmMiscellaneous: Remote test, remote inhibit, remote sounder, permanent mute SensorPower Supply 12 to 30v DC Consumption 1.2 WIndicators Power (Green LED)Gas Alarm (Green LED to red and sounder) - non latchingAlarm Threshold Preset (adjustable)Ambient Temp Operation: -5 to 45°C Storage: +10 to +60°CProtection IP42Weight 115gmsDimensions L 83mm x H 83mm x D 36mmTestingThe system may be electrically tested by pressing the test pad located on thecontrol unit for 15 seconds, after which the pre-alarm state will be initiated withthe exception of the relay, by maintaining pressure on the test pad for a further15 seconds a full alarm condition will result including the operation of both relays.Each sensor has an individual test switch which when pressed simulates gaspresent and turns the green LED to red and switches the sounder on.To ensure that the system responds correctly to the presence of gas, eachsensor should be exposed to test gas. It is advisable to carry out this test at least every six months.During test periods alarm relays may be inhibited by pressing the reset pad forfour seconds after which the fault indicator will illuminate and maintain all relaysin the normal non-alarm state.Product SelectionControl unit 200-011Optional Auxiliary Power Supply 200-005Flammable Sensor 200-010Refrigerant Gas Sensor 200-030Carbon Monoxide Sensor 200-020Hydrogen Sulphide 200-040Other gas type sensors available1 2 3E 1 2 3 4 1 2 3 4 1 2 3 4LMainsinZONE-SIG+ E NC C NOR1PRE-ALRL2FULL-ALARM1 15 30RL3FAULTNC C NO NC C NO NC C NO-24volts+ -N4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30SENSOR SENSORTransformerSounderAutoResetRemote ResetZone Signal Selectors 1-4F2 F1 RTAlarmRelaysSounder MuteRemoteInhibitRemoteSounderFieldTerminalsRL1RL2RL3-+FSig+s- - s + +s- - s + +s- - s + +s- - s +Flam R Flam ToxicGDS 202F FFT T T T T T T3 wire3 wire3 wire3 wire+s- - sINOUT+SounderRemove EOLlink from allbut last sensorsAlarm LEDSounder muteSensorSensitivity adjustmentTest SwitchTerminalsSpareISO 9001This document is not contractual and the equipment specification may be modified at any time without prior notice. TECHNOLOGIES LTDC936GDS Technologies LtdFusion Point, Ash LaneGarforth, Leeds LS25 2GATel +44 (0)113 286 0166Fax +44 (0)113 287 8178sales@gds-technologies.co.ukwww.gds-technologies.co.uk