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1. 22 TEF Oe eran Gace anaes 23 TaN REGL Ee 200Z SOUNDER MUTE DURATA anisat aa N EEEa ia D NE 24 E CONDITION OF U E E R A emer 26 RI 5 26 NERIS SEU 26 1 INTRODUCTION TECHNICIAN USE ONLY This unit must be installed by a suitably qualified technican who will install this unit in accordance with these instructions and the standards set down in their particular industry country Suitably qualified operators of the unit should be aware of the regulations and standards set down by their industry country for the operation of this unit These notes are only intended as a guide and the manufacturer bears no responsibility for the installation or operation of this unit Failure to install and operate the unit in accordance with these instructions and with industry guidelines may cause serious injury including death and the manufacturer will not be held responsible in this regard 1 1 GENERAL DESCRIPTION The state of the art LKD gas sensors can detect the leak of a wide range of gases R134a R404a e NH3 e R290 R600a e
2. 10 CONNECTIONS AND 11 4 1 STANDARD SEMICONDUCTOR MODEL srrttttttttt ttt ttti titt ttn tenete 11 42 MODBUSSENICONDUCTORMODEDe nente E E S etatis utate 12 4 3 STANDARD INFRARED MODEL e usati 13 4 4 MODBUS INFRARED 14 CONNECTION EXAMPLES wrsccascssecsisatenstscecticnessiscasennsesernnstoneesvenenesneneenneeste EXAMPLE OF 15 5 2 EXAMPLE OF NETWORK 15 MODBUS RTU PROTOCOL Z4 MODBUS RTU REMOTE Er IVS CT 17 Re ABORTE 17 DA NS MES E E E E 18 TES PONC HONCODE E A E EE E EEEE eer ES 18 REGTER NAR 18 7 OA REGISTERS 1000 1001 E T00 GAS CONCENTRATION EVE be 18 TER TO aaa aN aa aa ei a na 19 Glo ER TIDE ALARM SEIPOINT OS OF FLL 17 odd CURRO waning pene natura ete MUCIUS 21 DO 2 21 OTER TO VER 4l 21 7 3 7 REGISTER 2000 ALARM SETPOINT IN PP VI
3. CONNECTION DIAGRAM J6 J5 Jz Jy J3 Jx STANDARD ELECTRICAL CONNECTIONS and CONFIGURATION Power Supply 31 ON 2 OFF 1 2 12 24 V 31 12 DC 1 0 2 12 24 V Output signals 3 OV 0 Volts ground 4 V The voltage output settings are Jx OFF Jy OFF Voltage output 0 Jx Jy OFF Voltage output 0 Jx OFF Jy ON Voltage output 2 Jx ON Jy ON Voltage output 1 Current output 4 20 mA NOTE Current output needs to be enabled using Jy Jy ON Relay 6 NO Normally Open 7 COM Common 8 NC Normally Closed Alarm Potentiometer P1 Alarm Adjust alarm setpoint for the sounder and relay ZERO Potentiometer P2 ZERO Adjust the zero level voltage for the output signal SPAN Potentiometer P3 SPAN Adjust output signal span Power Supply Jumper amp amp ON HO OFF J1 ON J2 OFF Unit is set for AC power supply J1 OFF J2 ON Unitis set for DC power supply Sounder Jumper OFF ON Sounder enabled Audible alarm if Setpoint reached OFF Sounder disabled No audible alarms Sounder amp Relay delay Jumper amp amp JON 10 OFF J5 OFF J6 OFF 0 minutes no delay J5 ON J6 OFF 1 minute J5 OFF J6 ON 5 minutes J5 ON J6 ON 10 minutes Jumper Jx and Jy Voltage output range selection 6 ON Ho OFF Jx OFF Jy OFF Voltage output setting 0 10V Jx
4. Current output 4 20 mA CN3 Relay 6 NO Normallyopen 7 COM Common 8 Normally Closed Modbus 5485 9 GND Ground Isolated from OV 10 Non inverting Modbus Signal 11 Tx Rx Inverting Modbus Signal P1 Alarm Potentiometer P1 Alarm Adjust alarm setpoint for the sounder and relay P2 ZERO Potentiometer P2 ZERO Adjust the zero level voltage for the output signal SPAN Potentiometer P3 SPAN Adjust output signal span 4 20 mA Potentiometer P4 4 20mA Adjust the 4 to 20 mA current output Power Supply Jumper amp amp ON Ho OFF J1 J2 1 ON J2 OFF Unit is set for AC power supply J1 OFF J2 Unitis set for DC power supply Sounder Jumper OFF 43 ON Sounder enabled Audible alarm if Setpoint reached OFF Sounder disabled No audible alarms JA Reset Jumper m amp ON 9 OFF ON Stop Unit operation OFF Normal functioning Sounder amp Relay delay Jumper amp amp 0 46 OFF J5 OFF J6 OFF 0 minutes no delay 5 6 J5 ON J6 OFF 1 minute J5 OFF J ON 5 minutes J5 ON J6 ON 10 minutes Jumper J7 J8 J9 e J10 Voltage output range selection I amp amp ON HO J7 J8 Jumper J7 Voltage output setting 0 5V JZ J8 J9 J10 OFF J9 J10 Jumper J8 Voltage output setting 0 10 8 J7 J9 J10 OFF i Jumper J9 Vol
5. 1111 LKD Detection and indication of refrigerant leaks O 2 Z O 2 lt Z 2 LL O lt 2 lt The state of the art LKD gas sensors can detect the leak of a wide range of gases R134a R404a NH3 R290 R600a and 2 Invensys Controls SUMMARY 1 4 L2 4 5 1 4 TEST FUNCTION 5 UU io c 5 MECHANICAL INSTALLATION cccccccccccccccccccccccccccccccccccccccccccccsscccees 6 2 2 MOUNTING OF IP41 MODEL ttti ttt ttt ttt ttti ttt ttti 6 29 MOUNTING OF GICs eee peepee tee eres soe eee 7 INSTALLATION MAINTENANCE eee ee eee eee eee eee esee 9 INSTALLATION INSTRUCTIONS 8 2 EOOGATIENTNSTRESTIONE 8 Sq a ie ld o 8 swa c 24586 9 i aH M oM CMM UM uM erence MEM M NM MR UM MM M MM EM ANE 9 a Vez M 7 TAO AIRCONDITIONING 21 gt TEMO VRE Men Tc 10 10 3 4 OPERATING INSTRUCTION serrer ttt ttti ttt ttt ttis siste 10 3 5 FUNCTIONS
6. ON Sounder enabled Audible alarm if Setpoint reached OFF Sounder disabled No audible alarms Sounder amp Relay delay Jumper 99 OFF J5 OFF J6 OFF 0 minutes no delay J5 ON J6 OFF 1 minute J5 OFF J6 ON 5 minutes J5 ON J6 ON 10 minutes Jumper Jx and Jy Voltage output range selection Eon HO OFF Jx OFF Jy OFF Voltage output setting O 10V Jx Jy OFF Voltage output setting 0 5V Jx OFF Jy ON Voltage output setting 2 10V Jx Jy ON Voltage outputsetting 1 5V NOT USED Setpoint Voltage Test Point TP1 VREF Sounder and relay setpoint Voltage Vs Sensor Voltage Test Point TP2 Vs Vs sensor voltage LKD OV Test Point TP3 OV Board ground plane connection 4 4 MODBUS INFRARED MODEL CONNECTION DIAGRAM J4 O TP1 we 2791710 46 J9 46 J8 46 J7 i EN io mau o J1 MODBUS ELECTRICAL CONNECTIONS and CONFIGURATION Power Supply 1 J1 0ON J2 OFF 1 2 12 24 31 OFEJ2 wm DC 1 0 2 12 24 Output signals 3 0V 0 Volts ground 4 The voltage output settings 47 J8 J9 J10 OFF Voltage output 0 5V CN2 J8 ON J7 J9 J10 OFF Voltage output 0 10V J9 ON J7 J8 J10 OFF Voltage output 1 5V J10 ON J7 J8 J9 OFF Voltage output 2 10V 5
7. an area If the gas leak does not reach the sensor then no alarm will be raised Therefore it is extremely important to carefully select the sensor location Also consider ease of access for maintenance Things to do e Install the sensor inside the room at a proper height depending on the refrigerant Being gases heavier than air it is normally recommended to position LKD sensor lower than the average height of people inside the room e With heavier than air gases such as halocarbon and hydrocarbon refrigerants such as R404A propane and butane sensors should be located near ground level With lighter than air gas e g ammonia the sensor needs to be located above the equipment to be monitored on a bracket or high on a wall within 300 mm of With similar density or miscible gases such as CO2 sensors should be mounted about head high say 1 5m e install sensor away from draughts and heat sources Things not to do Do not mount LKD sensors e under reflective surfaces e g mirrors e inside electrical boards e inor near bathrooms 8 2 LIABILITY AND RESIDUAL RISKS Eliwell Controls srl as a distributor of MURCO Ltd products declines all liability for damage due to installation use other than expressly specified and in particular in conflict with the safety prescriptions set down in regulations and or specified in this document tampering with and or modification of the product installation use on panels that do not comply with
8. statutory laws and regulations 8 3 DISCLAIMER This document is the exclusive property of ELIWELL CONTROLS SRL and may not be reproduced or circulated without the express permission of ELIWELL CONTROLS SRL While all possible care has been taken to ensure the accuracy of this document ELIWELL CONTROLS SRL cannot accept liability for any damage resulting from its use The same applies to any person or company involved in preparing and editing this document ELIWELL CONTROLS SRL reserves the right to make aesthetic or functional changes at any time without notice MANUFACTURED BY Murco Limited 114a Georges Street Lower Dun Laoghaire Co Dublin IRELAND lt lill Eliwell Controls Srl Via dell Industria 15 Z I Paludi 32010 Pieve d Alpago BL Italy Telephone 39 0 437 986 111 Facsimile 39 0 437 989 066 Sales 39 0 437 986 100 Italy 39 0 437 986 200 other countries saleseliwell invensys com Technical Support Technical helpline 39 0 437 986 300 email techsuppeliwell invensys com 9MA10235 Manuale LKD 02 13 EN www eliwell com Copyright Eliwell Controls s r l 2013 All rights reserved
9. 006 Modbus Address 1 247 1007 Software version o 7 5 1 REGISTERS 1000 AND 1001 GAS CONCENTRATION LEVEL The real time gas concentration is available in different formats e Register 1000 maintains the detected concentration in percentage 96 of full scale e Register 1001 maintains the detected concentration in parts per million ppm For example a value of 33 represents in register 1000 33 of the maximum detectable gas concentration LKD Pag 18 26 7 5 2 REGISTER 1003 SENSOR FULL SCALE IN PPM The full scale sensor level is the maximum detectable gas concentration for the detector This maximum rating is stored in register 1003 so for the example register 1003 holds the value 1000 to represent 1000 parts per million ppm Example GAS CONCENTRATION _ _ _ Upper Limit Alarm ON ee Alarm Marna Setpoint OFF Time 7 5 3 REGISTER 1004 ALARM SETPOINT OF FULL SCALE The alarm setpoint is the threshold at which the gas concentration has reached a level to warrant the activation of the red LED alarm indication the relay the sounder and the Alarm flag by setting a 1 in register 3000 The alarm setpoint can be controlled using the detector hardware by adjusting the potentiometer P1 and monitoring the voltage on test point TP1 with respect to test point TP3 OV Alternatively a software value can be written into register 2000 to set the alarm level in ppm and override the hardware po
10. CO Two models available e with Semiconductor SC for refrigerant gases e with Infrared technology IR for CO One of the most important features is that they can be used e stand alone thanks to a relay activated digital output that can control a buzzer siren etc e the modbus version can be built into an Eliwell or third party remote management system eg TelevisGo thanks to an integrated modbus RS485 n b only model that has it is the CN4 connector The main applications are as follows e Compressor racks e LT or MT cold rooms e Refrigerated cabinets Detection of an excessive concentration of gas above the factory set limit results in the transmission of an alarm signal to the supervisor if connected to the network and the activation of an on site acoustic and visual signal LKD gas detector ensures a prompt detection of gas leaks thus reducing the risk of machine downtime 1 2 TECHNICAL DATA The main technical features of LKD series are R134a R404a NH3 R290 R600a CO IP41 MT applications and IP66 LT applications IP41 86x142x53 180 gr and IP66 175x165x82 629 gr 12 24 20 50 60 Hz 136mA nternal Buzzer Connections 1 RS485 for connection to Supervisor Modbus depending on model R134a R404a 0 1 000 ppm Typical operating range R290 R600a 0 2 000 ppm 0 10 000 ppm NH3 0 1 000 and 0 10 000 ppm emperature range 1 41 20 50 IP66 40 C 50 0 95 non con
11. Jy OFF Voltage output setting 0 5V Jx OFF Jy ON Voltage output setting 2 10V Jx Jy ON Voltage outputsetting 1 5V NOT USED Setpoint Voltage Test Point TP1 VREF Sounder and relay setpoint Voltage Vs Sensor Voltage Test Point TP2 Vs Vs sensor voltage OV Test Point TP3 OV Board ground plane connection LKD Pag 11 26 4 2 MODBUS SEMICONDUCTOR MODEL CN1 CONNECTION DIAGRAM 19 J10 J9 J8 J7 EN P3 mu o CN4 SENSOR 5 J2 MODBUS ELECTRICAL CONNECTIONS and CONFIGURATION Power Supply J1 ON J2 OFF 1 2 12 24 J1 OFF J2 ON wm DC 1 0 2 12 24 V Output signals 3 0V 0 Volts ground 4 The voltage output settings are 47 J8 J9 J10 OFF Voltage output 0 5V CN2 J8 ON J7 J9 J10 OFF Voltage output 0 10V 79 ON J7 J8 J10 OFF Voltage output 1 5V J10 ON J7 J8 J9 OFF Voltage output 2 10V 5 Current output 4 20 mA CN3 Relay 6 NO Normally open 7 COM Common 8 Normally Closed CNA Modbus RS485 9 GND Ground Isolated from OV 10 Non inverting Modbus Signal 11 Tx Rx Inverting Modbus Signal P1 Alarm Potentiometer P1 Alarm Adjust alarm setpoint for the sounder and relay P2 ZERO Potentiometer P2 ZERO Adjust the zero le
12. SW2 0 ADR 1 Valid address sW1 e SW1 1 SW221 ADR 17 Valid address 2 SW1 7 SW2 F ADR 247 Valid address e SW1 F SW2 F ADR 255 Reserved NOTES 1 SW1 and SW2 are hexadecimal dial switches 2 see full Address Table on the Modbus chapter LKD Pag 12 26 4 3 STANDARD INFRARED MODEL CONNECTION DIAGRAM J6 J5 Jz Jy J3 Jx 2 STANDARD J1 J2 s ELECTRICAL CONNECTIONS and CONFIGURATION Power Supply J1 ON 2 OFF 1 2 12 24 V J1 12 ON 1 0 2 12 24 V Output signals 3 0V 0 Volts ground 4 The voltage output settings Jx OFF Jy OFF Jx ON Jy OFF Jx OFF Jy ON Jx ON Jy Current output 4 20 mA NOTE Current output needs to be enabled using Jy Jy ON Voltage output 0 Voltage output 0 Voltage output 2 Voltage output 1 Relay 6 NO Normally Open 7 Common 8 NC Normally Closed P1 Alarm Potentiometer P1 Alarm Adjust alarm setpoint for the sounder and relay P2 ZERO Potentiometer P2 ZERO Adjust the zero level voltage for the output signal P3 SPAN Potentiometer P3 SPAN Adjust output signal span J1 J2 J1 OFF J2 ON Unit is set for DC power supply J3 Power Supply Jumper amp 0 HO OFF J1 ON J2 OFF Unit is set for AC power supply Sounder Jumper 6 ON HO OFF
13. allen below the alarm setpoint START Monitor GAS concentration DEACTIVATE Red LED Relay Concentration gt Alarm Flag and Setpoint Sounder Flag 0 ALARM PHASE Concentration gt Alarm Setpoint Red LED Relay amp Sounder ON Alarm Sounder amp Relay FLAG SET 1 NO Sounder Flag 1 Sounder Active Clear Sounder Flag 0 Write 0 to register 4000 DEACTIVATE Sounder Sounder mute register 4000 0 NO Wait for the Delay to expire Sounder Delay Period expired YES REACTIVATE Sounder Sounder mute register 4000 1 LKD Pag 24 26 Input Status Flags Input Status Flags are read only Function code 02 REGISTER DESCRIPTION RANGE DETAILS 3000 ee 1 0 Gas concentration is less than the alarm setpoint 1 Gas concentration is greater equal to alarm setpoint 0 Relay is not active 1 Relay is active 3002 pes 0 Sensor present in circuit and no open circuit fault detected 1 Sensor absence or open circuit sensor fault is detected 3003 Red LED 3004 Green LED 0 Red LED is OFF No alarm or fault condition exists 1 Red LED is ON Alarm Indication or Fault Indication if green LED is OFF 0 Green LED is OFF No power or fault condition if the red LED is ON 1 Green LED is ON Power indicator detector powered ON 1 0 The gas level is between zero and the full scale range 1 The gas level is outside the bounds of zero and the un
14. arm Limit register 2000 Alarm setpoint register 2000 0 NO Read hardware Alarm Potentiometer P1 Display the Setpoint as a percentage of full scale in Register 1004 Concentration gt Setpoint LKD Pag 22 26 7 5 8 REGISTER 2001 ALARM DELAY The Alarm Delay Register 2001 stores the software alarm delay period up to 59 minutes and the jumpers J5 and J6 set the hardware alarm delay period The alarm delay is the duration between the unit detecting a gas concentration above the alarm set point and the activation of the relay and the sounder G Only modbus model If jumpers J5 and or J6 are present ON during the connection of modbus cable on CN4 the software value is cleared following a restart whereby the power to the detector is turned off and then turned on again Following this restart the delay period is determined by hardware setting of jumpers J5 and J If there are no jumpers on both J5 and J6 the delay period written into the alarm delay register 2001 is used as the delay and is memorised and reused after a power cycle when the power is turned off and back on START Monitor GAS concentration Read software Alarm Limit register 2000 DEACTIVATE Red LED Relay Concentration gt Sounder and Alarm Flag 0 YES Set Alarm Flag Register 3000 1 Activate Red LED Register 3000 1 Read software Alarm Delay Register 2001 NO O Register 2001 lt 59 Use Software De
15. d using jumper J3 Default factory setting is option enabled G NOTE There is a 5 minute power up delay to allow the sensor to stabilize This can be cancelled by momentarily shorting between either of the upper and lower pads of SW1 or SW2 3 2 LOCATION INSTRUCTIONS 3 2 1 LOCATION OF SENSORS Sensors must be located within the appropriate wire lengths from the central control unit if used In all cases the sensor supplied is designed for maximum sensitivity to a particular gas e g R134a NH3 R290 etc However in certain circumstances false alarms may be caused by the occasional presence of sufficiently high concentrations of other gaseous impurities If such a situation is likely to arise installers should check that sensor s of suitable cross sensitivity can be supplied Examples of situations where such abnormalities may arise include e Plantroom maintenance activity involving solvent or paint fumes or refrigerant leaks e Plant rooms in fruit ripening storage facilities because of accidental gas migration bananas ethylene apples carbon dioxide e Heavy localised exhaust fumes carbon monoxide dioxide propane from engine driven forklifts in confined spaces or close to sensors A response delay may be selected to minimise any problems that might arise LKD Pag 8 26 3 2 2 MACHINERY ROOMS There is NO ABSOLUTE RULE in determining the number of sensors and their location However a number of simple guideli
16. densing ower supply display Alarm display 1 5 V configuration 05V Fault status 2 10 V configuration 1V 4 20mA configuration 2ma ault indication Red LED ON Green LED OFF ensor service life 50 alarm threshold 90 alarm threshold ecovery time LKD Pag 4 26 1 3 REGULATIONS LKD gas sensors are compliant with F GAS CE 842 2006 regulation e UNIEN378 standard provided they are installed by qualified technical personnel and they are checked periodically according to methods and frequency set by local regulations 1 4 TEST FUNCTION INSTRUCTIONS The LKD is calibrated in the factory and does not require to be calibrated on installation After installation the units should be bump tested Expose the sensors to test gas e _using an ampoule NH3 CO etc e using atest cylinder appropriate to the installation open the valve of a cigarette lighter only for Semiconductor units without igniting it and hold it over the vent holes on the upper right side of the LKD The gas is heavier than air and should fall into the LKD This will put the system into alarm The red LED will light showing the system is in alarm e delay will prevent the siren sounding or relay switching for the preset delay if delay is set With a bump test you can see the functions of the sensor e thered LED will light e the relay and sounder will function output selected for example 0 10 V
17. elay Sounder and Alarm Flag 0 Set Alarm Flag Register 3000 1 Activate Red LED Register 3000 1 Read software Alarm Delay Register 2001 NO Reg 2001 gt 0 Use Software Dela Alarm Delay Register 2001 0 YES Reg 2001 0 Use Hardware Delay Read hardware Delay Jumpers J5 and J6 Wait for the Delay period to expire ALARM PHASE Alarm Flag Register 3000 1 Relay ON Register 3001 1 Red LED ON Register 3003 1 Sounder Flag Register 4000 1 LKD Pag 20 26 7 5 4 REGISTER 1005 SENSOR TIMER The sensor timer register keeps a count of the number of hours the sensor is on The register is incremented every hour and after one year the register will exceed 8760 hours and the Test Flag will be set to 1 to indicate that the detector requires testing The Test Flag Register is located at address 4001 and can be cleared to indicate that the sensor and detector have passed the annual test New Tested Sensor Sensor Timer Register 1005 1 Test Flag Register 4001 1 Timer 1 every hour Reset Test request Register 4001 1 Write 0 to Register 401 to clear Test Flag 0 7 5 5 REGISTER 1006 MODBUS ADDRESS The Modbus address is the value of address set by the hexadecimal switches 7 5 6 REGISTER 1007 SOFTWARE VERSION The software version is the revision of firmware operating on the processor of the detector Analogue Output Registers Outp
18. elay if this option has been selected using jumpers J5 and J6 or using modbus command e the voltage or current output changes proportional to gas concentration 3 Fault condition e the green LED will be OFF the red LED will be e avoltage or current fault output will activate current fault 2mA onthe 4 20 mA output voltage fault 0 5V onthe 1 5Voutput and 1 0Von the 2 10 V output 3 5 FUNCTIONS CUSTOMIZATION The functions listed below need to be agreed with the customer so that the system will operate as required 1 Alarm signal delay applicable to the acoustic alarm buzzer and to the relay in order to avoid false alarms The delay is set by using jumpers J5 and J6 5 OFF J6 OFF 0 minutes no delay J5 J6 OFF 1 minute J5 OFF J6 ON 5 minutes J5 J6 ON 10 minutes The default value is 0 minutes 2 Buzzer the units have an internal buzzer It is possible to disable it by removing jumper J3 The default setting is buzzer enabled in compliance to EN378 3 Output set the requested analog output current or voltage Gas detectors can activate external systems such as fans or shut down and activate sirens warning lights or connect to most BMS SCADA or other control systems using one or more outputs 4 20 mA 0 5 V 1 5 V 0 10 V or 2 10 V Relay 1A at 24 V or 120 V LKD Pag 10 26 4 CONNECTIONS AND CONFIGURATION 4 1 STANDARD SEMICONDUCTOR MODEL
19. g inside the room to be monitored which depends on the specific behaviour of the monitored gas 2 2 MOUNTING OF IP41 MODEL The following pictures show dimensions and mounting diagram for model IP41 DIMENSIONS 5mm max LKD Pag 6 26 2 3 MOUNTING OF IP66 MODEL The following pictures show dimensions and mounting diagram for model 66 DIMENSIONS lt lill 11 11 LKD Pag 7 26 3 INSTALLATION MAINTENANCE 3 1 INSTALLATION INSTRUCTIONS The following steps must be followed 1 To open the Sensor enclosure the procedure varies depending on the model IP41 model press the fixing device on the top of the box to open it To close it follow the contrary steps don t forget to insert the cable clamp in the proper slot on the bottom of the instrument IP66 model unscrew the 4 allen screws on the top surface of the instrument To close it follow the contrary steps 2 Power supply 12 24 V connect power supply cable at positions and V at connector block CN1 NOTES For AC voltage set jumpers J1 ON and J2 OFF See wiring diagram For DC voltage set jumpers J1 OFF and J2 ON See wiring diagram Default factory setting is direct voltage Use 2 cores of a 4 core cable low voltage alarm type typically 7 0 2 mm 3 Output depending on the type of unit used S
20. here is no possibility of a thermal layer trapped under the ceiling preventing gas reaching the sensor NOTE At very low temperatures such as in a refrigerated cold store ammonia gas becomes heavier than air e With similar density or miscible gases such as sensors should be mounted about head high say 1 5m e Sensors should be positioned a little way back from any high pressure parts to allow gas clouds to form Otherwise any leakage of gas is likely to pass by in a high speed jet and not be detected by the sensor e Make sure that pits stairwells and trenches are monitored since they may fill with stagnant pockets of gas Ifa pressure relief vent pipe is fitted to the system it may be a requirement to mount a sensor to monitor this vent pipe It should be positioned about 2 m above the PRV to allow gas clouds to form e With racks or chillers pre fitted with refrigerant sensors these should be mounted so as to monitor the compressors or if extract ducts are fitted the airflow in the duct may be monitored 3 2 3 REFRIGERATED SPACES In refrigerated spaces sensors should be located in the return airflow to the evaporators on a sidewall below head height is preferred or on the ceiling not directly in front of an evaporator In large rooms with multiple evaporators sensors should be mounted on the central line between 2 adjacent evaporators as turbulence will result in airflows mixing 3 2 4 CHILLERS In the case of small
21. it full scale 0 The unit is operating normally DAS Vd 1 The unit is starting up Output Status Flags Output Status Flags are readable amp writable Function code 01 read Function code 05 write 0 0 0 0 0 1 1 1 REGISTER DESCRIPTION RANGE 5 0 Sounder is OFF 1 Sounder is ON 0 Sensor does not require testing yet AUU 1 Sensor ON operating for more than 1 year and requires testing Read Device ID Read only Function code 43 14 This function code allows reading the identification and additional information relative to the physical and functional description of the device The implementation of this function follows the specification MODBUS APPLICATION PROTOCOL SPECIFICATION V1 1b section 6 21 as published by the Modbus Organisation The following Object IDs have been implemented OBJECTID NAME DESCRIPTION VALUE NOTES roductCode asc sing semiconductor version vamos ated i The following Read Device ID code options have been implemented 01 request to get the basic device identification stream access 04 request to get one specific identification object individual access LKD Pag 25 26 8 WARNING 8 1 CONDITIONS OF USE Attention This product cannot be used in place of a SAFETY device It must be used only to signal an alarm Sensors monitor a point as opposed to
22. lay Alarm Delay Register 2001 0 YES Register 2001 0 Use Hardware Delay Read hardware Delay Jumpers J5 and J6 Wait for the Delay period to expire ALARM PHASE Alarm Flag Register 3000 1 Relay ON Register 3001 1 Red LED ON Register 3003 1 Sounder Flag Register 4000 1 LKD Pag 23 26 7 5 11 REGISTER 2002 SOUNDER MUTE DURATION The sounder mute duration is the time in minutes the sounder is deactivated for during the alarm phase when the gas concentration has reached or exceeds the alarm setpoint The alarm condition will activate the red LED and set the alarm flag to the value 1 The relay and the sounder will subsequently activate following any delay period and the alarm flag in register 3000 The relay flag in register 3001 and the sounder flag in register 4000 will all be set to the value 1 to indicate the active alarm state Clearing the Sounder Flag by writing the value zero into register 4000 will deactivate the sounder for the period defined by the sounder delay register 2002 The sounder delay is in minutes and the maximum value is 59 so for example if the value in register 2002 is 25 then the sounder will be disabled for 25 minutes during an alarm condition After this 25 minute mute period the sounder will be reactivated if the detector is still detecting gas concentrations at or above the alarm setpoint otherwise the sounder will not be reactivated if the gas concentration has f
23. nes will help to make a decision Sensors monitor a point as opposed to an area ATTENTION If the gas leak does not reach the sensor then no alarm will be raised Therefore it is extremely important to carefully select the sensor location Also consider ease of access for maintenance The size and nature of the site will help to decide which method is the most appropriate to use Locations requiring the most protection in a machinery or plant room would be around compressors pressurised storage vessels refrigerant cylinders or storage rooms or pipelines Most vulnerable are valves gauges flanges joints brazed or mechanical filling or draining connections etc When mechanical or natural ventilation is present mount a sensor in the airflow In machinery rooms where there is no discernable or strong airflow then options are Point Detection where sensors are located as near as possible to the most likely sources of leakage such as the compressor expansion valves mechanical joints or cable duct trenches e Perimeter Detection where sensors completely surround the area or equipment e With heavier than air gases such as halocarbon and hydrocarbon refrigerants such as R404A propane and butane sensors should be located near ground level e With lighter than air gas e g ammonia the sensor needs to be located above the equipment to be monitored on a bracket high on a wall within 300 mm of or on the ceiling provided t
24. s by a factor of 16 ADDRESS SELECTION RESERVED Address 1 Address 2 Address 9 6 120 _ Addes12 0 121 Addesi 0 0 0 0 0 Loo tt ress 1 s 8 e RSME m9 9 ro CRESERVED x RSEE As example address 254 is reserved for setting the Baud rate 9 600 bits per second To choose a baud rate select the address and reset the gas detector by shorting jumper J4 or by cycling the power on and off The desired Modbus address 1 247 can subsequently be selected ADDRESS 254 14 15 x16 LKD Pag 17 26 7 3 TECHNICAL DATA pm 8 b characters a silent of 3 5 characters indicates the end of a message a End of message 35 95 A new message can begin after this interval 7 4 FUNCTION CODES Function codes specify the action to be performed on the data in the registers of the gas detector FUNCTION CODE ACTION REGISTERS P06 Wiiteto Output Analogue Holding Registers 2000 writable O oa 7 5 REGISTER MAP The Register Map specifies the details of storage locations registers and flags within the detectors Analogue Input Registers Input Registers are read only Function Code 04 REGISTER DESCRIPTION M U Gas concentration level 96 of full scale Oe 4 IS T1001 Gas concentration level pars per iin a Alarm Setpoint of full scale 0 100 9 1
25. sensor element has been damaged or has reached end of life RESOLUTION check to see sensor element is properly inserted into board change sensor DEFECT You experience spurious alarms in the absence of a leak CAUSE Presence of sufficiently high concentrations of other gaseous impurities RESOLUTION Contact technical support for instructions and support LKD Pag 16 26 7 MODBUS RTU PROTOCOL 7 1 MODBUS RTU REMOTE TERMINAL UNIT PROTOCOL The CN4 Connector 9 GND 10 Tx Rx 11 Tx Rx is an RS 485 port for communicating between LKD gas detectors and the Remote Supervision system in Modbus RTU protocol The meaning of terminals is listed below 15 the non inverting data signal Tx Rx is the inverted data signal e GND is the board ground plane 7 2 ADDRESS There are 256 available selections and the addresses are numbered O to 255 inclusive Addresses are selected by rotating the hexadecimal dial switches SW1 and SW2 ATTENTION A Values 1 to 247 are valid usable addresses providing a unique identity for each gas detector Addresses 248 to 255 and address 0 are reserved for implementing specific features Modbus data with a zero in the address field is received by all detectors irrespective of the address selected by the dial switches to enable the master device to broadcast simultaneously to all the detectors Switch SW1 selects addresses 0 to 15 and switch SW2 multiplies the addres
26. tage output setting 1 5V J9 J7 J8 J10 OFF Jumper J10 Voltage output setting 2 10V 10 ON J7 J8 J9 OFF TP1 Setpoint Voltage Test Point TP1 Alarm Sounder and relay setpoint Voltage 2 gt Sensor Voltage Test Point TP2 Vs Vs sensor voltage OV Test Point OV Board ground plane connection Address The valid address has a range of 0 247 and the value is ADR SW1 SW2x16 SW1 1 SW2 0 ADR 1 Valid address SW1 1 SW2 1 ADR 17 Valid address SW1 7 SW2 F ADR 247 Valid address e SW1 F SW2 F ADR 255 Reserved NOTES 1 SW1 and SW2 are hexadecimal dial switches 2 see full Address Table on the Modbus chapter SW1 SW2 LKD Pag 14 26 5 CONNECTION EXAMPLES 5 1 EXAMPLE OF STANDALONE CONNECTION 1 free F2 AC 7 n aca PERCY 7 a uo 1209000 RS485 RS232 TelevisGo LKD Pag 15 26 6 FAQ Here is a list of some of the error signals which might occur Green Red light on sensor is not lit power supply possible wiring fault LKD possibly damaged in transit RESOLUTION check power supply check wiring install another LKD unit to confirm the presence of a fault DEFECT Red LED light ON and green LED light OFF to indicate a fault CAUSE sensor element may be disconnected from board
27. tandard or Modbus it is possible to set the analog output as Voltage Output V or Current Output mA by means of the jumpers Standard Model set jumpers Jx and Jy See wiring diagram Modbus Model set jumpers J7 J8 J9 and J10 See wiring diagram Default factory setting is mA on Standard model and always active on Modbus model Connect the other two cores of the 4 core cable used for the power supply to terminal block CN2 in the following positions Current output 4 20 Connect the cores of the cable to terminals 3 OV and 5 I of CN2 Voltage outputs 0 5V 0 10V 1 5V and 2 10V Connect the cores of the cable to terminals OV and 4 V of NOTE You can common the two zeros and use 3 core cable if preferred 4 Relay setpoint The potentiometer P1 sets the trip point for the relay and sounder using the 0 5V scale The measurement can be effected between Test Point OV and 1 VREF on Standard model and Alarm on Modbus model A reading of 2 5 V corresponds to half the range 500 ppm on a scale from 0 to 1000 ppm Default factory setting is 5096 of the range 5 Time delay A time delay for the operation of the relay and sounder can be selected using jumpers J5 and J J5 OFF J6 OFF 0 minutes no delay J5 ON J6 OFF 1 minute J5 OFF J ON 5 minutes J5 ON J6 ON 10 minutes Default factory setting is JB OFF and J6 OFF 6 Sounder The sounder can be disable
28. tentiometer setting until the software value is reset back to zero so although register 1004 is a read only register its value can be modified by writing to register 2000 The alarm setpoint register 1004 is measured as a percentage of the full scale so for example 1 0 Volt measured between test points TP1 and TP3 corresponds to a 20 Alarm Setpoint given that the maximum voltage is 5 0 Volts The alarm setpoint register 1004 will contain 20 to represent 20 and this corresponds to a 200 ppm for a detector with a full scale range of 1000 ppm If a delay time is set in 2001 register valued between 0 59 mins when an alarm occurs e the red LED and the Alarm Flag will be immediately activated e the relay and the sounder will be activated after the delay period is expired After that the delay period is elapsed the relay switches ON and the sounder din is audible NOTE The duration of the delay is measured from the instant when the gas concentration reaches the alarm setpoint and the red LED and the alarm flag are activated ppm 30 Set Alarm Alarm Delay P LKD Pag 19 26 START Monitor GAS concentration Read software Alarm Limit register 2000 NO Reg 2000 gt 0 Use Software SP Alarm Setpoint Register 2000 0 YES Reg 2000 0 Use Hardware SP Read hardware Alarm Potentiometer P1 Display the Setpoint as a percentage of full scale in Register 1004 DEACTIVATE Red LED R
29. the location of detectors shall be chosen in relation to the refrigerant Sensors shall be located where the refrigerant from the leak will collect In this case refrigerants are heavier than air and detectors should have their sensors mounted low or other similar Category Class A spaces Ceiling or other voids if not sealed are part of the occupied space Following a list of things to do and not to do DON TS mount the in room sensor at less than the normal heights of Do not mount LKD sensors the occupants between 200 500mm off the floor under reflective surfaces e g mirrors away from draughts and heat sources like radiators etc e inside electrical boards avoid sources of steam incr 3 3 TYPICAL SETTINGS An example of typical setting is Gas refrigerant 404 e Range 0 1000 ppm Alarm setpoint 500 ppm For a particular unit please refer to the gas settings shown on the rating plate 3 4 OPERATING INSTRUCTION 1 On powering up the sensor will sense the presence of gas after an initial warm up delay of 5 minutes The green LED will flash at 1 second intervals during the warmup not for MODBUS model 2 In alarm condition e the green LED stays ON the red LED will be ON e the buzzer operates if it has not been disabled using jumper J3 and after a delay if this option has been selected using jumpers J5 and J6 or using modbus commana e the relay output activates after a d
30. ut Registers are readable amp writable Function code 03 read Function code 06 write REGISTER DESCRIPTION RANGE DETAILS 2000 Alarm setpoint ppm OS 525 alarm setpoint threshold in parts per million 2001 Alarm delay the Alarm Delay isthe time in minutes afterthe gas concentration exceeds the alarm level and the Alarm Flag Register 300 is set to 1 the Sounder Delay is the time in minutes the sounder 2002 Sounder mute duration ORS is deactivated for during the alarm phase when the gas concentration exceeds the alarm set point LKD Pag 21 26 7 5 7 REGISTER 2000 ALARM SETPOINT IN PPM The alarm setpoint register 2000 stores the software setting for the alarm setpoint in parts per million ppm Writing the value zero into this register will enable the hardware potentiometer P1 to determine the alarm setpoint If a value greater than zero and less then the full scale sensor limit in ppm is written into register 2000 then the hardware potentiometer setting is ignored and the value written into register 2000 determines the alarm setpoint For example writing the value 500 into the alarm setpoint register 2000 effectively overrides the hardware alarm set point on the potentiometer P1 and sets the alarm gas concentration threshold to 500 parts per million and will be displayed as 50 in register 1004 to represent 50 for a detector with a full scale range of 1000 ppm START Monitor GAS concentration Read software Al
31. vel voltage for the output signal P3 SPAN Potentiometer P3 SPAN Adjust output signal span 4 20 mA Potentiometer P4 4 20mA Adjust the 4 to 20 mA current output Power Supply Jumper amp amp ON 7 OFF J1 J2 J1 ON 2 OFF Unit is set for AC power supply J1 OFF J2 ON Unit is set for DC power supply J3 Sounder Jumper Eon 46 OFF ON Sounder enabled Audible alarm if Setpoint reached OFF Sounder disabled No audible alarms JA Reset Jumper m amp ON 9 OFF ON Stop Unit operation OFF Normal functioning Sounder amp Relay delay Jumper 6 ON 9 OFF J5 OFF J6 OFF 0 minutes no delay J5 J6 55 J6 OFF 1 minute J5 OFF J6 ON 5 minutes J5 ON J6 ON 10 minutes Jumper J7 J8 J9 e J10 Voltage output range selection 46 OFF 17 18 Jumper J7 Voltage output setting 0 5V J7 48 J9 J10 OFF J9 J10 Jumper J8 Voltage output setting 0 10 8 J7 J9 J10 OFF i Jumper J9 Voltage output setting 1 5V J9 J7 J8 J10 OFF Jumper J10 Voltage output setting 2 10V 10 ON J7 J8 J9 OFF TP1 Setpoint Voltage Test Point TP1 Alarm Sounder and relay setpoint Voltage 2 gt Sensor Voltage Test Point TP2 Vs Vs sensor voltage OV Test Point OV Board ground plane connection Address The valid address has a range of 0 247 and the value is ADR SW1 SW2x16 SW1 1
32. water or air cooled enclosed chiller units mount the sensor so as to monitor airflow to the extract fans With larger models also place a sensor inside the enclosure under or adjacent to the compressors In the case of outdoor units e such as enclosed air cooled chillers or the outdoor unit for VRV VRF systems mount the sensor so as to monitor airflow to the extract fan With large units also place a sensor inside the enclosure under or adjacent to the compressors In the case of non enclosed outdoor units If there is an enclosed machinery section then locate a sensor there Inthe case of units with enclosed compressors mount sensors in the enclosures e Where you have protective or acoustic panels mount the sensor low down under the compressors where it is protected by the panels With air cooled chillers or air cooled condensers with non enclosed condenser sections it is difficult to effectively monitor leaks in the coil sections With some designs it will be possible using an airflow sensor to monitor airflow to the start up fans in the front or rear sections If there is a possibility of refrigerant leaks into a duct or air handling unit install a sensor to monitor the airflow Weatherproof sensors should be used for unprotected outdoor applications LKD Pag 9 26 3 2 5 AIR CONDITIONING DIRECT SYSTEMS VRF VRV EN378 states that at least one detector shall be installed in each occupied space being considered Also
33. will show the gas level To test the siren and or relay function check the delay is set at zero using the header as shown on the installation diagram and expose to gas as above You can mute the siren by removing the jumper J3 G After the gas has cleared the red led siren and relay will automatically reset Before testing the sensors on site the LKD must have been powered up and allowed to stabilize 1 5 ANNUALTEST To comply with the requirements of EN378 and the F GAS regulation sensors must be tested annually However local regulations may specify the nature and frequency of this test If not the recommended procedure should be followed Check local regulations on calibration or testing requirements ATTENTION After exposure to a substantial gas leak sensor should be checked and replaced if necessary CALIBRATION Sensor calibration is recommended every three years GAS SENSOR order to ensure a correct functioning of the unit a replacement of the gas sensor is recommended every 6 years LKD Pag 5 26 2 MECHANICAL INSTALLATION IMPORTANT A Always make sure the device is switched OFF before touching connections All operations must be carried out by QUALIFIED PERSONNEL 2 1 WARNINGS The mechanical mounting varies depending on the version which is being installed IP41 or 66 There are no different mounting instructions for semi conductor and IR models except for their positionin

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