DGS 101 Technical Sheet

Technical Sheet ref C1540 J GDS 101 SINGLE POINT GAS ALARM Operation A fixed single point alarm unit that meets the requirements for continuous economic and reliable monitoring of gas levels in a wide range of environments from commercial premises through to heavy industrial applications that may require hazardous area sensing. The GDS101 may be utilised as a standalone unit or as an addressable sensor forming part of the GDS Combi CANbus addressable network system and therefore offering the features of our most advanced system. Typical monitor locations are – public buildings, boiler plant rooms, swimming pools, water treatment works, H&V control systems, manufacturing and process plants. Installation CONTROL UNIT: The control unit should be mounted in a position which is accessible and in the field of vision. Mains should be from a fused supply. SENSORS: The positioning of sensors depends upon the type of gas to be monitored and its density with respect to air. HEAVY GASES (LPG, Propane, Butane, Refrigerant Gases) – locate at 15 to 20 cm from the floor. LIGHTER GASES (Methane, Natural Gas, Town Gas) – locate at 5 to 10cm from the ceiling. CARBON MONOXIDE – locate at 1.5 metres above floor level. All equipment should be mounted away from direct heat and in accordance with its IP rating. Initial Set–up Procedure Having terminated all cables switch on the power and wait for the 1 minute stabilisation period to complete, this is indicated by the power and inhibit indicator changing from flashing to a steady state, a reduced power mode feature is activated one hour following any operator activity, this state is indicated by a screen power reduction of approximately 50%, pressing any button will return the screen to full display. The alarm panel may have been supplied without a sensor and a customer supplied device is to be used, in this case the following adjustments should be carried out. Adjust jumpers as follows: For 24DC (+ sig –) 4~20mA sensor devices connect jumpers J5/11 Position A, J12 Off, J14 link B. For catalytic sensors (W Y P) J5/11 Position B, J12 On, J14 Link A. (Caution reset link J14 to position A before connecting the sensor as damage will occur requiring sensor replacement). Sensor supply may be measured between the two sensor voltage test pins, adjust as required using the sensor supply adjustment potentiometer. See sensor cell supply table. Test pins TP6/TP7 may be used to check 4~20mA sensor input signals 4mV = 4mA. Measuring across TP8/TP9 will allow the 4~20mA output signal to be checked 4mV = 4mA. Output for pellistor (flammable) can be adjusted using 4+20mA pots. Changes to gas type and range can be made by connecting GDS RS232 pod to J3 and using a PC running hyper terminal at 4800 baud. The Hyper Terminal output screen shows continuous data output/ commands and allows input from the PC keyboard pressing ‘C’ enters calibration mode, press ‘G’ to change the gas type to match the cell being used. Note – the range of the new gas has a default value but can be adjusted by pressing ‘R’. For catalytic sensors course zero adjustment is achieved by turning the zero potentiometer (10 turn) until the zero LED just turns off. Access to the Menu The GDS101 is supplied with factory set default settings which may be re-adjusted from the front screen and push buttons: Press 2 to access the menu followed by 231, menu entry will be at level 5 (Exit), pressing 1 or 3 will enable travel through the sub menus 1–9 and adjustment of settings, pressing 2 enables access into each sub menu and on completion pressing 2 will confirm your selection and move to the next setting. 1. Zero/Span – In clean air Zero display – apply test gas at the peak reading and adjust the span. 2. Alarm Levels – 3 alarm levels. Pressing 1+3 together will cycle through rising and falling alarms and latched (L) or unlatched (U) (auto reset) relays in following order ( ) L, ( ) U, ( ) U, ( ) L. Default setting latched. 3. Alarm Delay – Time to alarm in seconds (default setting 2 seconds) maximum 255 seconds. 4. Inhibit Alarm – Isolate alarm functions – maintenance and test periods. Second part of this menu allows YES/NO selection of sounder alert for alarm A1. 5. Exit Press 2 – Entry and Exit point of menu. 6. L.C.D Brightness – Adjustment of display brightness. 7. L.E.D/Relay Test – Turns indicators and relays ON. 8. Auto Zero – Use only when very low alarm levels are required (<10% of scale). 9. Sensor Address – Used when connecting to a GDS Combi system. A. 4~20mA output adjust (Tox/O2 only). Pressing 1 or 3 will allow for output to be adjusted to 4mA and 20mA as measured on test pins 8+9. B. To set A1 alarm relay to become a global sounder relay with a 10min time delay after alarm condition ends. Press 1 to active or press 3 to deactivate. C. To delay relay deactivation after alarm condition has ceased, press 2 to cycle through alarms A1,A2 and A3. when the required alarm is displayed press 1 to increase the delay and 3 to decrease the delay. D. Allows relay A3 to change from alarm relay to valve timer central relay E. Relay on time, minimum 2 minutes maximum 200 mins. F. Relay off time, minimum 2 minutes maximum 200 mins. E: [email protected] T: +44 (0)113 286 0166 GDS TECHNOLOGIES LTD | FUSION POINT | ASH LANE | GARFORTH | LEEDS | LS25 2GA | UK www.gds-technologies.co.uk

E: [email protected] T: +44 (0)113 286 0166 GDS TECHNOLOGIES LTD | FUSION POINT | ASH LANE | GARFORTH | LEEDS | LS25 2GA | UK www.gds-technologies.co.uk This document is not contractual and the equipment specification may be modified at any time without prior notice. Technical Sheet ref C1540 J Mains Version 230/115v AC 50/60 Hz DC Version 24v DC ± 15% Power 4w Outputs Alarms 1, 2, 3 relays – S.P.C.O. ND (NE option) Fault Relay – S.P.C.O. ND (NE option) normaly latched (unlatched option) Relay contacts rated 3A/230v AC CANbus – see Combi alarm system 4~20mA analogue output Sensor Cell Supply Table Indicators Power Green L.E.D Alarms 1, 2, 3 Red L.E.D’s Fault Amber L.E.D Display 2 line alpha–numeric Audible Alarm Gas/Fault mutable: 85dB@10cm Environmental Operating temperature: 15 to +50°C Storage temperature: 5 to +55°C Humidity 5–95% RH non condensing Protection IP65 Sensor Cable 3 core 1.5mm screened → 1.5km SPECIFICATION 4–20 OV Lo Hi 24V NO C AL3 NC NO C NC NO C AL2 NC NO C AL1 NC W + Y sig P – SENSOR FAULT + – 4–20mA Output PC comms via hyperterminal Sensor Voltage test pins Zero LED 4mA J28 20mA Zero Gain J3 J29 J11 J18 J17 J16 J15 J19 J1 TP3 A B A B A B TP11 TP12 TP6 TP7 TP13 TP8 TP9 TP2 TP4 TP1 Contrast J6 J20 J5 J4 J7 J12 J13 J14 J8 J9 x fault Inhibit Ov 24v J1 CANbus – EOL – see Combi J4/7 For Semiconductor sensors J5/11 Sensor (B–catalytic A–4~20mA) J6/20 Sink/Source 4~20mA output J8 Gain – factory set J9 Normally fitted 4~20mA out J12 Bridge fault enable fit for catalytic sensor J13 See J8 J14 Sensor supply selector A for catalytic sensor B for 4~20mA sensor J15 Sounder mute J16 N/E – A3 relay link on J17 N/E – A2 relay link on J18 N/E – A1 relay link on J19 N/E – fault relay link on J28 Reset processor J29 Address change enable – see Combi C1529 A B 4~20mA In Sensor supply adjust 4~20mA Output CAT300A 2v/300mA CAT170A 2v/175mA SEM–1 5v/170mA SEM–1 4v/170mA Ammonia GDS PRIME 4v/70mA F6–170 2v/175mA CAT335C 2.5v/335mA THE300A 2v/300mA SS10 2v/175mA CAT335A 2.5v/335mA CAT335B 2.5v/335mA CAT100A 2v/100mA 3 wire GDS 101 Sensor +24 0v 4~20mA + s Y P W – +24 Hi Lo 0v 4~20mA 2 wire GDS 101 Sensor +24 0v 4~20mA + s Y P W –