User Guide for Gassonic Observer
Contents
1. When a gas leak occurs in the detector s coverage area the trigger level will be reached the LED in optical link window will be illuminated and the alarm relay timer will be started When the delay times out the unit will go into alarm mode which will result in the following The dB value preceded by an A will flash on the display The alarm relay will energize if in factory default and the contact will close For setting of trigger level and delay time see section 5 4 2 and 5 4 3 Installation and User Guide for Gassonic Observer Ultrasonic gas leak detector Page 8 5 3 2 4 20 mA output The 4 20 mA output is factory set to be Sourcel but this can be specially ordered to be Sink At normal operation the output will be between 4 and 20 mA When using this output method a trigger level at least 6 dB higher than the background noise and an alarm delay time gt 10 seconds should be set in the fire amp gas system dB and mA comparison for trigger levels dB mA Output The output value in mA corresponding to the sound pressure in lt ee ee dB can be calculated by the following formula n 58 16 46 4 x 59 a 64 The transposed formula s U 48 18 88 1 a x 93 n Sound Level in dB 19 x Output value in mA 84 i Error readouts can be monitored using the 4 20 mA output 94 See section 5 3 3 Relay trigger levels 1 Source The detector sends out a current loop 2 Sink The detector receives a curr2. lt r lt kakal Q C A L TECHN INSTALLATION AND USER GUIDE FOR GASSONIC OBSERVER ULTRASONIC GAS LEAK DETECTOR General Monitors Company INSTALLATION AND USER GUIDE FOR GASSONIC OBSERVER From serial number 1011 014 Installation and User Guide for Gassonic Observer BB 6017 09 TABLE OF CONTENTS Page 1 Technical Data On The Gassonic 0bserver Ill U a 3 2 Introduction EEE EEE 4 3 General Description and FE tures Lu nu auasserseegnessesenenumGnendnsnndnemntspdnnnemndidennidindvondt 4 3 1 Area NNN 4 DN u u EE aea 4 A libi u u u T us 02 as 5 4 1 Mechanical CONStructiOn ccccccssessssssssssssssssesrsesscsesrsesesecsesesesecseeusesevacsusesesacsesusesevaceusesesaceususesevaeeusesevasensnsesaranenss 5 NNN 6 1 NN 6 12 TN 6 MINN 9 Operation IN 8 5 NNN 8 NNN 8 5 2 Acoustic Self test EE EE NE NE 8 Er NNN 8 MN 8 NNN 9 Dr TN 9 S34 R9489 Digital 0 1 neuaicipssisnneaeneeanaeneemiennMenin 10 5 4 User Interface Settings U III aaasswsasswanuaswasyaa aaa wayanawhawayaawquanawayaqqanahin 11 5 4 1 Forced Acoustic est nrnna 11 542 Setting Checking Trigger Level l l l U U U U nannnnsna 11 54 3 AE NIS 12 5 4 4 Setting Checking Alarm Relay Energized De energized 1 l l u 12 5 4 5 Setting Checking Alarm latching N Vvs 13 5 4 6 Setting Checking RS485 Address u
3. SAVE on the display Confirm the save by activating the ENTER switch or discard the save by activating the MENU switch once more If no switch is activated for 60 seconds the detector will return to normal operation without saving the changed settings The Factory default settings are Trigger level 79 Delay time 01 Alarm relay de energized Alarm latching off RS485 address to 00 Gassonic Gassonic Gassonic OBSERVER OBSERVER OBSERVER Gassonic Gassonic Gassonic OBSERVER OBSERVER OBSERVER Installation and User Guide for Gassonic Observer Ultrasonic gas leak detector Page 14 6 GAIN TEST AND CALIBRATION Calibration of the Gassonic Observer is only needed when the unit is more than 3 dB out of tolerance This can be verified by doing an Observer Gain Test on the unit The Observer Gain Test is one of the test sequences of the Gassonic 1701 Calibration is done with a calibrated Gassonic 1701 6 1 Gain Test Set the Gassonic 1701 into Observer Gain Test See Gassonic 1701 User Manual for details Turn the Gassonic 1701 onto the Gassonic Observer and activate the Gain Test by pressing ENTER or TEST button The Gassonic 1701 will output a constant sound pressure level of 99dB for 8 seconds and then to OdB for 3 seconds Thereafter the sound pressure level will return to 99dB and the sequence will be repeated until a new sound pressure level is selected or the test stopped To
4. uu u uuu u uu uuu u u U u 13 5 4 7 Setting Checking Factory Default ON OFF J n nrnna 14 6 Gain Test and Calibration 1 l l I l l U U I nnnnnnnasssnnnaa 15 ENN NNN 15 AE EG EEE EE EE EE 15 1 RS485 DEN NTE Assens 16 1 1 Customer COMMANAS ccsesssessssssssssscsssssssssssssssscsvscscscscecsesssesesesesasavavavasaceueesesesesesesesavavavasasecessusestersesessvsvasanstetes 16 1 2 Detailed Customer Command description escccisncccorscecnsnsreaensexsadenausencusesnausceaneduenatanedatanesumastxedianisedientovescmtanecaeadhs 17 1 TECHNICAL DATA ON THE GASSONIC OBSERVER ACOUSTIC SPECIFICATIONS Microphone unit Detector frequency range 25 kHz 70 kHz Dynamic range 58 dB 104 dB TEST SOUND SOURCE Test frequency 40 kHz 3 kHz Sound pressure 100dB 60 mm from the sound source POWER REQUIREMENTS Input voltage 15 30 VDC Class 2 power supply for UL ULc areas Maximum current consumption 250 mA OUTPUT SIGNALS Analogue 4 20 mA interface Maximum permitted load resistance is 5000 0 mA No power Low supply voltage 1 mA Acoustic error 3 mA Unit inhibit 4 20 mA 58 dB 104 dB SPL Digital RS 485 interface Relay1 Error fault indication NC Load 500 mA max Switch Voltage 200 VDC max Relay2 Indication of alarm trigger level reached Load 500 mA max Switch voltage 200 VDC max Factory default NC de energized This can be changed by the operator ENVIR
5. LED CUSTOMER COMMAND DESCRIPTION Set Trigger Level Sound level before activating alarm relay n 59 99 dB Automatic range adjustment lt 58 59 gt 99 99 Get Trigger Level Set Alarm Delay Delay from detected alarm sound level before activating alarm relay n 0 60 10 sec 0 600 sec Automatic range adjustment gt 60 60 Get Alarm Delay Set Relay Function Set the relay default in normally closed NC or normally open NO position n 1 NC normally closed default 0 NO normally open Automatic range adjustment gt 1 NO normally open MASTER ADR Installation and User Guide for Gassonic Observer BB 6017 09 Page 17 Get Relay Function MASTER ADR Set Alarm Latching Function Function to hold alarm instead of resetting alarm when sound level falls below trigger level The alarm can be reset on the front panel by activating the SET switch or by sending Reset Alarm command on RS485 n 0 OFF 1 ON Automatic range adjustment gt 1 0N Get Alarm Latching Function Get Sound Level Read current sound level in dB n 51 99 dB Note This function does not affect analog output or alarm relay output Get Alarm Status Read current sound level in dB n Binary coded alarm status Bit 0 Low supply error Bit 1 Acoustical error Bit 2 Electrical error Bit 3 Inhibit Note This function does not affect
6. ONMENTAL DATA Operational temperature range 40 C to 60 C Humidity 0 to 100 relative humidity 2 INTRODUCTION GAS LEAK DETECTION COVERAGE REF METHANE Ultrasonic background noise lt 74 dB low noise areas 12 m radius leak rate 0 1 kg sec 8 m radius leak rate 0 03 kg sec Ultrasonic background noise lt 84 dB high noise areas 8 m radius leak rate 0 1 kg sec 4 m radius leak rate 0 03 kg sec CERTIFICATIONS ATEX Ex II 2G EEx d e ib IIB H2 T6 UL ULc Flameproof enclosure CLASS 1 DIV 1 Groups BCD 40 C to 60 C IECEx Ex Il 2G EEx d e ib IIB H2 T6 GGTN K Permit to use Kasakhstan GOST R Russia Pending INGRESS PROTECTION EN60529 A1 IP66 RF EMISSION AND IMMUNITY Tested according to EN61010 1 EN61000 6 2 EN61000 6 3 CONSTRUCTION Stainless steel AISI 316L Weight 7 5 Kg DIMENSIONS 202 189 mm 7 95 7 44 in The Gassonic Observer is an ultrasonic gas leak detector for detecting pressurised gas leaks This user manual describes how to install the Gassonic Observer and how to make the necessary checks and adjustments to ensure optimal performance 3 GENERAL DESCRIPTION AND FEATURES The Gassonic Observer detects leaks from pressurised gas systems by sensing the airborne ultrasound produced by the gas escaping This detection method is omnidirectional It can function in extreme weather conditions and is ideal for monitoring leaks from valves and flanges in complex pipeline
7. allation and User Guide for Gassonic Observer Ultrasonic gas leak detector Page 12 5 4 5 Setting Checking Alarm latching ON OFF The alarm latching feature gives the local operator the opportunity to latch the alarm relay output in alarm even if the sound level drops below the trigger level The alarm latching is factory set to OFF Activate the MENU switch five times with the magnet stick The current Alarm Latching status will be displayed factory setting ALOF OFF Activating the DOWN switch W will switch the Alarm Latching status to ON Activating the UP switch A will switch the Alarm Latching status back to OFF Activating the ENTER switch without changes made switches the unit back to Normal Operation Activating the ENTER switch with changes made will flash SAVE on the display Confirm the save action by activating the ENTER switch once more Activating the MENU switch while SAVE is flashing will discard the save and switch the unit back to Normal Operation If ENTER was activated the unit will display DONE to confirm that the changes have been saved and return to Normal Operation The operator can change the latching settings and if desired move to the next item RS485 Address in the menu structure by activating the MENU switch straight after the change The change will be saved at a later stage by activating the ENTER switch at any point in the menu structure If no switch is activated for 60 seconds the detector w
8. analog output or alarm relay output Installation and User Guide for Gassonic Observer Ultrasonic gas leak detector Page 18 Get Box Temperature Read box temperature relative in C n 0 121 C 0 40 C 120 80 C 121 gt 80 C Note This function does not affect analog output or alarm relay output Get 24V supply Read Gassonic Observer power supply voltage in V n 13 28 V Note This function does not affect analog output or alarm relay output Set to Factory Default Copy default values from Service and Productions registers to user data registers Reset Alarm Reset alarm output that is hold by the Alarm Latching function Note This function sets relays and analog output back to normal state Forced Acoustic Test Start one transducer frequency sweep Return max sound level in dB when sweep is finished n lt 58 104 dB Note Set analog output to inhibit and disable gas alarm relay output Installation and User Guide for Gassonic Observer BB 6017 09 Page 19 GASSONIC OBSERVER From serial number 1011 014 GASSONIC A S Energivej 42 A DK 2750 Ballerup Denmark Tel 45 44 700 910 Fax 45 44 700 911 BB 6017 09 C ASSON IC mail Ogassonic com CAPITOL COPENHAGEN 45 4580 0831 AG l itors C eneral Monitors Company www gassonic com
9. eives a current loop Source The detector sends out a current loop Installation and User Guide for Gassonic Observer Ultrasonic gas leak detector Page 4 4 INSTALLATION 4 1 Mechanical construction The Gassonic Observer consists of two chambers In the ATEX certification the top chamber is an increased safety enclosure EExe and the bottom chamber is a flameproof enclosure EExd In the UL ULc certification the top chamber as well as the bottom chamber are flameproof enclosures The cables are connected through M20 x 1 5 cable entries in the top chamber using approved EExe glands Or approved conduit with seal installed within 18 of the detector The inner cores of the cable penetrating the detector should be at least 25 cm long This will ensure no tension on the wires and connector PCB when the top chamber is opened The two mounting bolts are on the top chamber of the detector and this means that the cables will enter on the fixed part of the detector The bottom part is attached to the top by means of six allen screws with lock washers Unscrewing these screws will expose the connector PCB in the top chamber These screws will be fixed by retaining washers to the bottom part The bottom part of the detector is supported by the Load strap which is connected to the top z oan Figure 1 SD QI 1 Top the fixed part of the detector Flame path 2 3 M5 Earth Connection 4 Inner top chamber ATEX EExe UL ULc EExd 5 M20
10. ent loop 5 3 3 Error output Error fault conditions are indicated in three ways On the User Interface display Through the 4 20 mA analogue output By means of the Error relay Error Display 4 20 mA output Error Relay ERAC Unit Inhibit communicating with the See section 5 4 3 mA Energized detector through the User Interface Tolerance 0 4 The unit will have an Inhibit output when the local operator is changing settings on the detector 1 mA for 5 seconds and then showing the measured ultrasonic background noise level until the next acoustic self test where the same sequence will be repeated if the test signal is too low When a forced acoustic test is in progress via the RS485 digital communication COM will be displayed on the User Interface Installation and User Guide for Gassonic Observer BB 6017 09 Page 9 5 3 4 RS485 Digital Communication Via the half duplex RS485 interface the user can look up and change various settings of the Gassonic Observer Up to 32 Gassonic Observer units can be connected into a RS485 multidrop interface The transmission line should be terminated at both ends at master computer and before last unit of the line with a 120 Ohm resistor The Gassonic Observers can not initiate a communication but can only respond to a command from the master computer The Gassonic Observers operate in polled slave mode When the master computer broadcasts an address a command a variab
11. eturn to normal operation Installation and User Guide for Gassonic Observer BB 6017 09 Page 15 1 RS485 DIGITAL INTERFACE 7 1 Customer Commands The Gassonic Observer will always start up in Customer Command mode The Customer Commands are public domain and written in the Gassonic Observer manual so that the end user is able to write PLC or PC codes which can communicate with the Gassonic Observer CUSTOMER COMMANDS WRITE TO SETUP REGISTERS DESCRIPTION 54 99 lt 54 54 Set Trigger Level dB gt 99 gt 99 Set Alarm delay 0 60 0 600 sec in steps of 10 sec gt 60 60 Relay function NO 1 NC NO NC gt 1 gt NO Alarm Latching 0 OFF 1 ON OFF ON READ FROM SETUP REGISTERS ws Get Trigger Level dB Get Alarm delay in steps of 10 sec Get Relay function NO NC Bit 0 Low supply Bit 1 Acoustical Get Alarm Latching OFF ON a vane level Get Alarm status Bit 2 Electrical Bit 3 Inhibit Get Box 0 121 Temperature 40 C to 80 C Read 24V supply 13 28 13V 28V SPECIAL FUNCTION COMMANDS DESCRIPTION SUS gg Set To Factory Default TT re ne Reset Alarm Alarm Forced Acoustic Test OFF 1 ON OFF ON gt 1 ON xx Any value Invalid input value is changed to a valid value CMD All commands in HEX ACK 06 HEX Installation and User Guide for Gassonic Observer Ultrasonic gas leak detector Page 16 7 2 DETAI
12. hree times with the magnet stick The current delay time will be displayed factory setting 01 10 sec Activating the UP switch A will increment the delay time by 10 sec Activating the DOWN switch W will decrement the delay time by 10 sec Activating the ENTER switch without changes made switches the unit back to Normal Operation Activating the ENTER switch with changes made will flash SAVE on the display Confirm the save action by activating the ENTER switch once more Activating the MENU switch while SAVE is flashing will discard the save and switch the unit back to Normal Operation If ENTER was activated the unit will display DONE to confirm that the changes have been saved and return to Normal Operation The operator can change the delay time and if desired move to the next item alarm relay energized de energized in the menu Structure by activating the MENU switch straight after the change The change will be saved at a later stage by activating the ENTER Switch at any point in the menu structure If no switch is activated for 60 seconds the detector will return to normal operation without saving the changed settings Gassomic Gassonic Gassonic OBSERVER OBSERVER OBSERVER Gassonic Gassonic Gassonic OBSERVER OBSERVER OBSERVER 5 4 4 Setting Checking Alarm Relay Energized De energized The Alarm Relay is normally de energized at power up of the unit The output is an open contac
13. ill return to normal operation without saving the changed settings Gassonic Gassonic Gassonic OBSERVER OBSERVER OBSERVER Gassonic Gassonic Gassonic OBSERVER OBSERVER OBSERVER 5 4 6 Setting Checking RS485 Address The RS485 Address is a two digit number from 00 to 99 This can only be changed locally Activate the MENU switch six times with the magnet stick The current RS485 Address will be displayed factory setting 00 Activating the UP switch A will increment the RS485 Address Activating the DOWN switch W will decrement the RS485 Address Activating the ENTER switch without changes made switches the unit back to Normal Operation Activating the ENTER switch with changes made will flash SAVE on the display Confirm the save action by activating the ENTER switch once more Activating the MENU switch while SAVE is flashing will discard the save and switch the unit back to Normal Operation If ENTER was activated the unit will display DONE to confirm that the changes have been saved and return to Normal Operation The operator can change RS485 address settings time and if desired move to the next item Factory Default ON OFF in the menu Structure by activating the MENU switch straight after the change The change will be saved at a later stage by activating the ENTER Switch at any point in the menu structure More information about the RS485 protocol is available in section 7 If n
14. le and checksum the Gassonic Observer with that address will respond The Gassonic Observer will respond with its identification address a response a variable and a checksum The use of a checksum ensures that if data corruption occurs during transition the information is disregarded and the information is transmitted again The units should be connected by means of a twisted pair cable to reduce the effect of interference A low Baud rate of 2400 Baud is used for the RS485 communication ADDRESS COMMAND VARIABLE CHECKSUM om UT Or Ur UT COMMAND SDDDDDDDDS SDDDDDDDDS SDDDDDDDDS SDDDDDDDDS B01234567B B01234567B B01234567B B01234567B IDENTIFIER RESPONSE VARIABLE CHECKSUM asos UT Ur WT WT RESPONSE SDDDDDDDDS SDDDDDDDDS SDDDDDDDDS SDDDDDDDDS B01234567B B0123456 7B B01234567B B01234567B To allow the Gassonic Observer to distinguish between the address field and other fields D7 is always set in the address field and always cleared in other fields Computer Checksum ADDpo pe CMDpo pe VARpo pe Gassonic Observer Checksum IDpo p6 RESpo p6 VARpo pe A detailed description of the protocol can be found in section 7 Installation and User Guide for Gassonic Observer Ultrasonic gas leak detector Page 10 5 4 USER INTERFACE SETTINGS The User Interface consists of a four digit LED display window and four magnetic switches to enable a local operator to confirm or change settings without opening the unit When the
15. nt the Trigger Level in 5 dB increments Activating the ENTER switch without changes made switches the unit back to Normal Operation Activating the ENTER Switch with changes made will flash SAVE on the display Confirm the save action by activating the ENTER switch once more Activating the MENU switch while SAVE is flashing will discard the save and switch the unit back to Normal Operation If ENTER was activated the unit will display DONE to confirm that the changes have been saved and return to Normal Operation NB The operator can change the trigger level and if desired move to the next item delay time in the menu structure by activating the MENU switch straight after the change The change will be saved at a later stage by activating the ENTER switch at any point in the menu structure If no switch is activated for 60 seconds the detector will return to normal operation without saving the changed settings Gassonic Gassonic Gassonic OBSERVER OBSERVER OBSERVER Gassonic Gassonic Gassonic OBSERVER OBSERVER OBSERVER Installation and User Guide for Gassonic Observer BB 6017 09 Page 11 5 4 3 Setting Checking Delay Time The delay time is linked to the ALARM RELAY The delay time can be set from 0 to 600 seconds If the relay output is being used for executive action it is of utmost importance that the delay time is of a sufficient length to eliminate spurious alarms Activate the MENU switch t
16. o switch is activated for 60 seconds the detector will return to normal operation without saving the changed settings Gassonic Gassonic Gassonic OBSERVER OBSERVER OBSERVER Gassonie Gassonic Gassonie OBSERVER OBSERVER OBSERVER Installation and User Guide for Gassonic Observer BB 6017 09 Page 13 5 4 7 Setting Checking Factory Default ON OFF The Factory Default command gives the local operator the opportunity to return all settings to factory default Activate the MENU switch seven times with the magnet stick Factory Default OFF FDOF will be displayed Activating the DOWN switch W will switch the Factory Default ON Activating the UP switch A will switch the Factory Default OFF Activating the ENTER switch without changing the status to ON switches the unit back to Normal Operation Activating the ENTER switch having changed the status to ON will flash SAVE on the display Confirm the save action by activating the ENTER switch once more Activating the MENU switch while SAVE is flashing will discard the save and switch the unit back to Normal Operation If ENTER was activated the unit will display DONE to confirm that all settings have been returned to the Factory Default and return to Normal Operation Activating the MENU switch an eighth time will switch the unit to Normal Operation if any changes were made in previous menu items not in factory Default ON OFF the unit will flash
17. oise radius of 9 12 metres VERY LOW NOISE AREAS Typical areas In very low noise areas background noise lt 58dB the trigger Onshore wellhead areas in calm environment level must be set at 64 dB This corresponds to a detection Salt dome gas storage facilities in calm environment radius of 13 20 metres 3 1 Area monitored by the Gassonic Observer The detection coverage of the Gassonic Observer is determined by the ultrasonic noise levels in the area of installation Experience has shown that most process environments can be divided into three overall noise levels This is illustrated in the image below The detection coverage characteristics are based on live tests and show the minimum coverage of the Gassonic Observer detector in areas without solid physical obstructions between the detector and the leak For further instructions on installation Gassonic A S can be consulted 3 2 Detector Outputs The Gassonic Observer detector has several output methods Analogue 4 20 mA interface Sink or Source Factory setting Source Digital RS485 interface Alarm relay The Alarm relay is controlled by an adjustable trigger level in 5 dB steps from 59 to 99 dB and has an adjustable internal alarm delay from 0 to 600 seconds It is necessary to introduce an alarm delay of at least 10 seconds either internally or in the control system Factory setting 79 dB and 10 seconds delay Error relay NC Sink The detector rec
18. ophone is faulty and needs A mA replacement If none of the above is true the unit can be tested by means of a Gain Test with a Gassonic 1701 1 mA 5 seconds Portable Test and Calibration Unit before sending Acoustic self test duration is approximately 8 seconds the unit back to Gassonic for service When the detector is performing the Acoustic Self test the last dB level is displayed on the user interface and sent to the 4 20 mA output During this time a green LED will be illuminated and can be seen through the optical link window 5 3 Output Methods The Gassonic Observer has three major output methods Alarm Relay output Standard source 4 20 mA analogue output RS485 digital communication Half duplex In addition to this the detector has an Error Relay The users need to determine the output method suited for their use 5 3 1 Alarm relay output When using this method an internal trigger level and delay time must be set The trigger level should be at least 6 dB higher than the background noise The trigger level can be set in steps of 5 dB from 59 dB to 99 dB and the factory setting is 79 dB An alarm delay time is implemented to eliminate spurious alarms due to short background noise peaks This delay time can be set internally from 0 to 600 seconds through the user interface or via the RS485 digital interface The factory setting is set to 01 10 seconds The delay can alternatively be set in the Fire and Gas Panel
19. racket UA1352 This bracket is an optional accessory and is supplied with two M8 mounting U bolts which can fit around a pole with a maximum dimension of 63 mm It is possible to mount the detector directly onto non vibrating structural beams or cable trays The microphone should face downwards and if tilting of the detector is necessary the angle of incline should not exceed 45 Avoid when mounting the detector within a half metre from a solid structure for example a wall or a big vessel to point the acoustic test sound source into the direction of this structure The sound source should as far as possible be pointing into free space M8 mounting bolt not supplied Maximum screw depth into the top is 14 mm Figure 3 4 4 REPLACEMENT PARTS Description Gassonic Part Number 1983 Installation and User Guide for Gassonic Observer Ultrasonic gas leak detector Page 6 5 WIRING DIAGRAM LOOOHd weJbeip Bum JEUUINU SJ sj ua u g Auedwio sioltuow esaua9 v OLIN J l N 0SSVC gt C L CV uos1 q p suoul ny NESAN t G3Lv738 en FAH 1 pInNsuoy S0UE OJS PU BupueyagapepuerQ ou N UONEJ3dO EWJON XBW OQA 007 3beyon YMS xeW yw 00S pe07 yndyno Aejay 10443 yndul vu 0Z t 34 0 S 1IM Ajddns METABO O ONINYVM a qe gt 4aWO SND WOLL GW UONI3UUOD YJUEJF IPISUJ AW XV nejz p opez ON UOnNeJ3do EWJON xew DAA 007 3beyjon YMS xew yw OOS peo1 1ndano Aej y we
20. s 5 2 Senssonic acoustic self test An acoustic self test named Senssonic is done every 15 minutes and takes approximately 8 seconds A test signal with a frequency Sweep at a constant amplitude is transmitted by the ultrasonic sound source to the microphone The detector analyses the result of the Sweep and stores the highest dB value This value is compared to a factory reference value and the result must be within a predefined tolerance If the test signal is out of the predefined tolerance the Observer will do a new acoustic self test 30 seconds after the first failed test If this test signal is still out of tolerance a new acoustic self test is done again 30 seconds later If the third test signal is still out of tolerance the Gassonic Observer will go into acoustic error mode In acoustic error mode the code ERAC will be displayed the Error Relay will be de energized and the user can acquire the relay status via the RS485 digital interface Furthermore the 4 20 mA output will indicate 1 mA for 5 seconds and return to normal ultrasonic background noise level until the next acoustic test failure This sequence will repeat until the acoustic fault is repaired Acoustic self test sequence There could be a number of causes for this error A Q There is an obstacle blocking the sound path E The sound source is faulty and needs AS Q Q co S Ss SS N S S N RNS replacement ar SSS SIS IS SR SE gt The micr
21. select a new sound pressure level the DOWN button should be pressed There are four levels 99dB 89dB 79dB and 640B The dB readout on the display of the Gassonic 1701 can now be compared with that of the Observer 6 2 Calibration Set the Gassonic 1701 into Observer Gain Test See Gassonic 1701 User Manual for details Set the Gassonic Observer into Calibration mode by holding the magnet stick on the ENTER switch for more than 3 seconds The Observer will display a flashing CAL Verify the need for calibration by activating the ENTER switch one more time The Observer will now display a flashing 1701 This indicates that the Gassonic Observer is ready for calibration and is awaiting communication from a Gassonic 1701 unit Gassonic Gassonic Gassonic Hold for more than 3 seconds OBSERVER OBSERVER OBSERVER Turn the Gassonic 1701 onto the Gassonic Observer and activate the calibration by pressing ENTER or TEST button The calibration sequence is automatic If communication between the Gassonic Observer and the Gassonic 1701 is broken EER will be displayed and the unit will return to normal operation If the calibration sequence was completed successfully and adjustments were made ADJ will be displayed for 2 seconds and the unit will return to normal operation If the calibration sequence was completed successfully and adjustments were not necessary OK will be displayed for 2 seconds and the unit will r
22. systems both onshore and offshore The detector has the following certifications ATEX approval Ex Il 2G EEx d e ib IIB H2 T6 according to standards EN 50014 EN 50018 EN 50019 and EN 50020 certificate number DEMKO O4ATEX136396 UL ULc approval Class 1 Div 1 Group BCD 40 C to 60 C according to standards UL 1203 and UL 913 IECEx approval Ex II 2G Ex d e ib IIB H2 16 according to standards IEC 60079 0 IEC 60079 1 IEC 60079 7 and IEC 60079 11 certificate number ULD 05 0007 A copy of the ATEX certificate is available on request from your local Gassonic representative The detector housing is casted AISI 316L acid proof stainless steel and the ingress protection is IP66 The performance of the Gassonic Observer as a safety device is not covered by the ATEX certificate Installation and User Guide for Gassonic Observer BB 6017 09 Page 3 Detection Coverage Characteristics i a ae N A 2 LOW NOISE AREAS VERY LOW NOISE AREAS HIGH NOISE AREAS Typical areas In high noise areas background noise lt 78dB the trigger Turbo compressor areas level must be set at 84 dB This corresponds to a detection Complete open offshore weather deck radius of 5 8 metres Next to very noisy machinery LOW NOISE AREAS Typical areas In low noise areas background noise lt 68dB the trigger Areas with no machinery level must be set at 74 dB This corresponds to a detection Areas with low frequency machine made n
23. t The output can be changed to closed contact at alarm by energizing the Alarm Relay Activate the MENU switch four times with the magnet stick The current Alarm Relay status will be displayed factory setting RL E energized Activating the UP switch A will switch the Alarm Relay status to de energized Activating the DOWN switch W will switch the Alarm Relay status back to energized Activating the ENTER switch without changes made switches the unit back to Normal Operation Activating the ENTER switch with changes made will flash SAVE on the display Confirm the save action by activating the ENTER switch once more Activating the MENU switch while SAVE is flashing will discard the save and switch the unit back to Normal Operation If ENTER was activated the unit will display DONE to confirm that the changes have been saved and return to Normal Operation The operator can change the relay energizing settings and if desired move to the next item alarm latching ON OFF in the menu Structure by activating the MENU switch straight after the change The change will be saved at a later stage by activating the ENTER Switch at any point in the menu structure If no switch is activated for 60 seconds the detector will return to normal operation without saving the changed settings Gassonic Gassonic Gassonic OBSERVER OBSERVER OBSERVER Gassonic Gassonic Gassonie OBSERVER OBSERVER OBSERVER Inst
24. user interface is used the unit will move out of normal operating mode 5 4 1 Forced Acoustic Test This will enable the local operator to test the acoustic properties of the unit Activate the MENU switch with the magnet stick The code ATOF Acoustic Test Off will be displayed Activating the UP switch will display the wait command followed by the sound level detected by the microphone emitted from the sound source If this value is flashing the unit is failing the acoustic test There could be a number of causes for this error see section 5 2 for more information The DOWN switch W will stop the acoustic test and display ATOF Activating the ENTER switch at any time during this operation will display DONE and take the unit back to Normal Operation If no switch is activated for 60 seconds the detector will return to normal operation Gassonic Gassonic Gassonic OBSERVER OBSERVER OBSERVER Gassonic Gassonic Gassonic OBSERVER OBSERVER OBSERVER 5 4 2 Setting Checking Trigger Level The trigger level can be set from 59 to 99 dB in steps of 5 dB The ALARM RELAY will activate at this trigger level changing from open contact to closed factory default Activate the MENU switch twice with the magnet stick The current trigger level will be displayed factory setting 79 dB Activating the UP switch A will increment the trigger level by 5 dB Activating the DOWN switch W will decreme
25. x1 5 cable entry 6 7 8 EN 1 Factory installed earth wire between top and bottom parts Load strap Bulkhead separating the two chambers and permanently attached to the bottom chamber 9 EExe Connector PCB 10 Allen screw and lock washer must be tightened with 9 Nm Wire lengths inside the top chamber 25 cm OT Figure 2 Optical link window User Interface Switches operated with magnet stick Microphone NS Test sound source Installation and User Guide for Gassonic Observer BB 6017 09 Page 5 4 2 MECHANICAL OPERATION AND SAFETY When closing the top chamber ensure that the Load strap and wires are not caught between the bulkhead and the top part of the detector Check the status of the O ring and the flame path if top chamber is used as EExd Replace O ring if damaged Send unit to Gassonic for repair if the EExd flame path is damaged The six allen screws with lock washers must be tightened to 9 Nm using a torque wrench WARNING The inner six screws should not be unscrewed and the bottom EExd chamber should not be opened The warranty will be void if the bottom chamber is opened 4 3 MOUNTING Two M8 stainless steel bolts not supplied 88mm apart attached to the top of the detector are used to fix the Gassonic Observer in its operating position These bolts may penetrate the detector top by a maximum of 14 mm The detector can be mounted to a freestanding pole or wall using the Gassonic mounting b
26. y payjeqsul AuoqoeJ SI Weg WOWOg 24 0 do y Wo uo no uuo2o yeg Solu S TXOZW Sod Z a qed 4aWO SNS UIO LJ GW UONDSUUM yeg 3p SINO u 12S 3A JD9 0D e aq UEI SIYJ p pi lus q P NOYS SIM BUDIS Vuu0Z t pue Jed PIISIML S9HSU SUL GN 11ed D 1SIM S8v SU matfag U 00S 32UEISIS34J peo PINIUWJSd WNLWIXENW 324NOS Nejap JOPDEH vui OZ p VW OG UONdUWNSUOJD JUSJJND WNUWIIXEN ddns Jamod z SSRe D TN DAA OE ST 2beyjon Ajddns sjeuBis WW 0z rt pue S8rSY 341 P 3IYS 0 p sn q ues AND 3H35 9l 0 paJ23UU0d BUJ3JUT YDS JU AJY ojeq 09700 44 pamasa SJYBU y 3 luoSseo eaout DIUOSSEA BAOUY JO uadold e s BuImelp SIy I SOLLGL Page 7 Installation and User Guide for Gassonic Observer BB 6017 09 5 OPERATION AND SETUP 5 1 Normal operation On power up of the Gassonic Observer the unit will perform an initialization of the micro controller internal tests and then goes into normal operation mode within a few seconds The real time ultrasonic sound level will be shown on the display The corresponding 4 20 mA value will be set on the analogue output The Alarm relay is Normally open de energized but this can be changed by the operator to Normally closed energized The error relay is Normally closed energized The RS485 digital interface is ready to receive command The acoustic Self test is done at regular interval
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