GASSONIC Observer-i Instruction Manual
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GASSONIC Observer-i Instruction Manual

Ultrasonic gas leak detector
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  • Page 1 GASS SONIC C OBSE ERVER Ultras sonic Ga as Leak Detecto The i information a and technical l data disclos sed in this docum ment may be e used and di isseminated o only for the purpo oses and to the extent sp pecifically au uthorized in...
  • Page 2 GASSONIC OBSERVER-i This page intentionally left blank.

  • Page 3: Table Of Contents

    INTRODUCTION ......................7  2.0 GENERAL DESCRIPTION AND FEATURES ................ 8      2.1. Artificial Neural Network (ANN) ....................8     2.2. Area Monitored by Gassonic Observer-i .................. 10     2.3. Detector Outputs ........................11 3.0 INSTALLATION ........................12      3.1.

  • Page 4: Gassonic Observer-I

    5.0 FUNCTION TEST, GAIN TEST AND CALIBRATION............48      5.1. Gassonic SB100 Ultrasonic Bump Tester ................48     5.2. Gassonic 1701 Portable Test and Calibration Unit ..............49     5.3. Gain Test ..........................49     5.4. Calibration ..........................49 6.0 MODBUS DIGITAL INTERFACE ..................
  • Page 5 GASSONIC OBSERVER-i     6.7.17. Comm 2 Address (12H) ......................66     6.7.18. Comm 2 Baud Rate (13H) ....................... 66     6.7.19. Comm 2 Data Format (14H) ....................66     6.7.20. Software Rev Minor (15H)......................67  ...
  • Page 6 GASSONIC OBSERVER-i     6.8.22 Set Cut-off Frequency (E2H) ....................79 7.0 CUSTOMER SUPPORT ....................... 80  8.0 APPENDIX ..........................81      8.1. Warranty ........................... 81     8.2. Specifications ........................... 82     8.2.1. Electrical Specifications ......................83     8.2.2.

  • Page 7: Introduction

    This user manua l describes the installati ion, operatio n, and maint tenance of the e Gassonic O Observer-i to e ensure its opt imal performa ance. ”i” in the nam me Gassonic Observer-i st ands for intel lligent...

  • Page 8: General Description And Features

    28 meters, when a gas leak occurs. The Gassonic Observer-i is suitable in all pressurized gas installations, from 2 BAR (29 psi) or more, where the escaping gas is in a gaseous state when it leaks.
  • Page 9 (dB levels) in individual frequency bands. As such, the Gassonic Observer-i detects only the sound from gas leaks, even if the gas leak sounds are occurring at much lower sound levels than the background noise.

  • Page 10: Area Monitored By Gassonic Observer-I

    Area Monitored by Gassonic Observer-i The Gassonic Observer-i is configured in either Enhanced or Classic Mode with SPL trigger levels as low as 44 dB and is capable of detecting 0.1 kg/sec gas leaks at on-axis distances of up to 30 meters.

  • Page 11: Detector Outputs

    GASSONIC OBSERVER-i 2.3. Detector Outputs The Gassonic Observer-i UGLD has the following output capabilities: • Analog Output 4-20 mA current loop interface – Sink or Source (factory setting = Source) • Alarm relay to indicate potential gas leak alarm •...

  • Page 12: Installation

    3.1. Mechanical Construction The Gassonic Observer-i consists of two chambers. Both chambers are certified as flameproof (Ex d) and Explosion-proof (XP). The cables are connected through M20 x 1.5 6H cable entries in the top chamber using approved Ex d glands or approved conduit with seals installed within 18” of the detector.

  • Page 13: Mechanical Operation And Safety

    NOTE: The ambient temperature is limited to -40ºC to +60ºC. The performance of the Gassonic Observer-i Ultrasonic Gas Leak Detector, as a safety device per clause 1.5 of Annex II of the ATEX Directive 94/9/EC, is not covered by the ATEX certificate.

  • Page 14: Mounting

    Two M8 stainless steel bolts (not supplied), 88 mm apart, attached to the top of the detector are used to fix the Gassonic Observer-i 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 bracket 80601-1.

  • Page 15: Wiring Diagram

    GASSONIC OBSERVER-i 3.4. Wiring Diagram Figure 5: Wiring Diagram 3.5. Protective Earth Grounding Figure 6: External Earth Terminal The protective earth ground terminal requires the use of an M5 ring lug and star washer. The wire gauge should be less than or equal to the gauge of the power supply wires.
  • Page 16 GASSONIC OBSERVER-i Figure 7: Internal Earth Terminal...

  • Page 17: Operation And Setup

    SPL level (dB) at which the ANN starts to operate. For example, if the ANN is set to 64 dB, all acoustic noise received by the Gassonic Observer-i with a sound level below 64 dB will...

  • Page 18: Alarm Relay Energized / De-Energized

    Factory default is if HART is installed HART is enabled & current is normal 4.3.8. HazardWatch HazardWatch is used when the Gassonic Observer-i is part of a General Monitors HazardWatch Fire and Gas System or a MSA Model 10K system.

  • Page 19: Acoustic Self-Test

    Gassonic Observer-i back to the factor ry for service. Durin g the acoust tic self-test, the Gassonic c Observer-i displa ays the last S SPL reading recorded im mmediately be efore the sta rt of the test t, and indicat...

  • Page 20: Relay Ratings

    GASSONIC OBSERVER-i • Alarm Relay Output Can be configured as normally energized/de-energized • Errors Relay Output Always configured as normally energized • 4-20 mA Analog Output Can be configured as source or sink • Serial Digital Communication Configurable as Dual Modbus or Single Modbus and HART (optional) The user needs to determine the appropriate output method.
  • Page 21 GASSONIC OBSERVER-i of ≥ 10 seconds should be set in the fire & gas system. For Enhanced Mode, an internal alarm delay time ≥ 2 seconds and an ANN Sensitivity Level between 54 and 84 dB is recommended. For maximum coverage distance, the ANN Sensitivity Level can be set at 44 dB.

  • Page 22: Switching Modes

    GASSONIC OBSERVER-i 4.4. Switching Modes          Classic Mode, (Display=CLSM)   HART Enabled (Special)  Function  HART Disabled  HART Enabled (Standard)  Normal Analog Output  4 mA to 20 mA = 40 dB(u) to  4 mA to 20 mA = 40 dB(u) to  4 mA to 20 mA = 40 dB(u) to  120 dB(u)  120 dB(u)  120 dB(u)  Menu Activated  3 mA  3.5 mA  3 mA  Acoustic Error  1 mA  3.5 mA  1.25 mA  Low Supply Voltage  0 mA  3.5 mA  1.5 mA  SB100 Test Mode  4 mA to 20 mA = 40 dB(u) to  4 mA to 20 mA = 40 dB(u) to  4 mA to 20 mA = 40 dB(u) to  120 dB(u)  120 dB(u)  120 dB(u)    ...
  • Page 23 GASSONIC C OBSERV VER-i curren nt and display y follows the p present dB. T The relay retu urns to norma al after the rel ay reset is ac ctivated via Mo odbus, HART T, or remote s switch. The u...
  • Page 24 G G ASSONIC C OBSERV V ER-i 24 4...

  • Page 25: Error / Fault Output

    This fault occurs if the supply voltage at the Gassonic Observer-i drops below +12.5 VDC. When the supply returns to normal, the Gassonic Observer-i will go back to start up. Action - Ensure that the supply voltage is at least +14 VDC at the Gassonic Observer-i.
  • Page 26 Action - An internal error has occurred. The unit must be returned to the factory for service. Critical Memory Error This is a main memory error and the Gassonic Observer-i may not function correctly. Action – The unit must be returned to the factory or authorized service center for repair.

  • Page 27: User Display & Magnet Interface

    When the user interface is used the Gassonic Observer-i will change to setup mode. The setup mode consists of the following tests: Analog Output=3.5 mA (HART Enable), 3.0 mA (HART Disable).
  • Page 28 GASSONIC OBSERVER-i Figure 8: User Menu Diagram...

  • Page 29: Setting / Checking Detection Mode And Analog Output Mode

    The Detection Mode can be set by placing the magnet at the MENU button during start up for 5 seconds. At the end of the start-up, the Gassonic Observer-i will go to the detection set up menu by displaying “ENON” for Enhanced Mode On or “ENOF” for Enhanced Mode off. “ENOF” means the Gassonic Observer-i is in Classic Mode.

  • Page 30: Forced Acoustic Test

    GASSONIC OBSERVER-i 4.5.2. 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”...

  • Page 31: Setting / Checking Trigger Level (Ann Sensitivity Level)

    GASSONIC OBSERVER-i 4.5.3. Setting / Checking Trigger Level (ANN Sensitivity Level) Depending on Classic Mode or Enhanced Mode, the trigger level or ANN Sensitivity Level can be set from 44 to 99 dB in steps of 5 dB. In Classic Mode, the ALARM RELAY will activate at this trigger level,...

  • Page 32: Setting / Checking Cut-Off Frequency (Enhanced Mode Only)

    GASSONIC OBSERVER-i 4.5.4. Setting / Checking Cut-Off Frequency (Enhanced Mode only) In Enhanced Mode the cut-off frequency of the unit can be set between high (FQHI) and low (FQLO). The factory default setting is “FQHI” to eliminate spurious alarms in ultra-high noise areas. This setting can be set to “FQLO”...

  • Page 33: Setting / Checking Delay Time

    GASSONIC OBSERVER-i 4.5.5. Setting / Checking Delay Time The delay time is linked to the ALARM RELAY. The delay time can be set from 0 to 240 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.

  • Page 34: Setting / Checking Alarm Relay Energized / De-Energized

    GASSONIC OBSERVER-i 4.5.6. 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 contact. The output can be changed to closed contact at alarm by energizing the Alarm Relay.

  • Page 35: Setting / Checking Alarm Latching On / Off

    GASSONIC OBSERVER-i 4.5.7. 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.

  • Page 36: Setting / Checking Factory Default On / Off

    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 Gassonic Observer-i factory default settings are as follows: Feature Setting...
  • Page 37 GASSONIC OBSERVER-i...

  • Page 38: Switching Hazardwatch Mode On/Off

    GASSONIC OBSERVER-i 4.5.9. Switching HazardWatch Mode ON/OFF Activate the MENU switch eight times with magnet stick. The factory default setting (HZOF) will be displayed. Activating the DOWN switch (▼) will switch the factory default ON (FD ON). Activating the UP switch (▲) will switch the factory default OFF. Activating the ENTER switch having changed the status ON/OFF, will flash “SAVE”...

  • Page 39: Hart On/Off

    GASSONIC C OBSERV VER-i 4.5.10. HA ART ON/O Gassonic Ob bserver-i pro ovides the op perator the ability to fie eld configure the unit to either Enabl le/Disable HA ART commu unication. When HART communica ation is enab bled, the Ga...

  • Page 40: Setting Hart Analog Output Range (Only If Hart Is On)

    GASSONIC OBSERVER-i 4.5.11. Setting HART Analog Output Range (only if HART is on) The Gassonic Observer-i provides the operator the ability to field configure the unit to either 3.5 mA or 1.25 mA minimum HART analog output. Activate the MENU switch ten times with the magnet stick. The factory default setting (Ao35) will be displayed.

  • Page 41: Modbus Setting: Baud (Channel One)

    GASSONIC OBSERVER-i 4.5.12. Modbus Setting: Baud (Channel One) Activating the MENU switch eleven times will display the default setting Baud rate “B192” (19200). Using the UP/DOWN switches, the Baud Rate can be selected for the Modbus communication interface. The selectable Baud Rates are 57600, 38400, 19200, 9600, 4800 or 2400 bits per second.

  • Page 42: Modbus Setting: Format (Channel One)

    GASSONIC OBSERVER-i 4.5.13. Modbus Setting: Format (Channel One): Activating the MENU switch twelve times will display the default Modbus setting Format “F8N1” (8-N- 1). Using the UP/DOWN switches, the format can be selected for the Modbus communication interface. The selectable formats are: 8-N-1, 8-E-1, 8-O-1, or 8-N-(bits- parity-stop bits).

  • Page 43: Modbus Setting: Address (Channel One)

    GASSONIC OBSERVER-i 4.5.14. Modbus Setting: Address (Channel One) Activating the MENU switch thirteen times will display the current Address of the Modbus (Factory setting is 001). Activating the UP switch (▲) will increment the address and activating the DOWN switch (▼) will decrement the address (the range is 1 to 247). Activating the ENTER switch having changes made, will flash.
  • Page 44 GASSONIC OBSERVER-i If HART is enabled (factory default is ON) Channel 2 will not appear. Activating the MENU thirteen times will switch the unit to normal operation. If HART is Disabled the baud rate for Channel 2 will appear. NOTE: If HART is enabled the following channel two items will not appear.

  • Page 45: Baud (Channel Two)

    GASSONIC OBSERVER-i 4.5.15. Baud (Channel Two) Activating the MENU switch fourteen times will display the default setting baud rate “B192” (19200). Using the UP/DOWN switches, the Baud Rate can be selected for the Modbus communication interface. The selectable Baud Rates are 57600, 38400, 19200, 9600, 4800 or 2400 bits per second.

  • Page 46: Format (Channel Two)

    GASSONIC OBSERVER-i 4.5.16. Format (Channel Two) Activating the MENU switch fifteen times will display the default setting Format “F8N1” (8-N-1). Using the UP/DOWN switches, the Format can be selected for the Modbus communication interface. The selectable Formats are: 8-N-1, 8-E-1, 8-O-1, or 8-N-(bits- parity-stop bits).

  • Page 47: Address (Channel Two)

    Activating the MENU fifteen times will switch the unit to normal operation. 4.5.18. Loop Test ON/OFF (LTON/LTOF) Activating the DOWN switch for 3 seconds will turn on (LTON) the Loop Test function for the Observer-i (in Enhanced Mode only). The loop test communicates to the Observer-i that the 1701 Test and Calibration unit will be used to test the detector while in Enhanced Mode.

  • Page 48: Function Test, Gain Test And Calibration

    Gassonic SB100 Ultrasonic Bump Tester For a simple function test of the Gassonic Observer-i, the Gassonic SB100 can be used to do a bump test of the Gassonic UGLD’s without actually having to be in physical contact with the detector itself.

  • Page 49: Gassonic 1701 Portable Test And Calibration Unit

    Gassonic 1701 can be used. Calibration of the Gassonic Observer-i is only needed when the unit is more than ±3 dB out of tolerance. This can be verified by doing a Gain Test on the unit. The Gassonic Observer-i Gain Test is one of the test sequences of the Gassonic 1701.
  • Page 50 GASSONIC OBSERVER-i Activate the calibration by pressing the ENTER or TEST button on the Gassonic 1701. The calibration sequence is automatic. If communication between the Gassonic Observer-i 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”...
  • Page 51 GASSONIC OBSERVER-i Figure 9: Calibration Routine...

  • Page 52: Modbus Digital Interface

    GASSONIC OBSERVER-i 6.0 Modbus Digital Interface The Gassonic Observer-i is available in a Dual Modbus configuration and in a Single Modbus + HART configuration. For the Dual Modbus configuration, two independent Modbus communication channels are provided and referred to as Comm 1 and Comm 2. For the Single Modbus + HART configuration, the Modbus channel is referred to as Comm 1.

  • Page 53: Modbus Read Response Message

    Observer-i Slave Address Gassonic Observer-i ID (Address) 1-247 (Decimal) Function Code Preset Single Register Register Address Not used by Gassonic Observer-i Register Address 00-FF (Hex) Gassonic Observer-i Commands Preset Data Hi 00-FF (Hex) Gassonic Observer-i Hi Byte Command Data Preset Data Lo...

  • Page 54: Modbus Write Response Message

    6.5. Exception Responses and Exception Codes In a normal exchange, the master device sends a query to the Gassonic Observer-i. The Gassonic Observer-i receives the query and returns a normal response to the master. If a communication error occurs, there are three possible responses from the Gassonic Observer-i: 1.

  • Page 55: Exception Responses

    Table 10: Exception responses 6.5.2. Exception Code Field In a normal response, the Gassonic Observer-i returns data and status in the data field, requested in the query from the master. In an exception response, the Gassonic Observer-i returns an exception code in the data field, which describes the condition that caused the exception.

  • Page 56: Command Register Locations

    6.6.1. Operational Mode Commands See Section number listed below and reference Section 6.7 for details of each register. NOTE: The Gassonic Observer-i has Modbus error reporting. The optional dual Modbus has error reporting for each channel. It can also provide simultaneous block mode.
  • Page 57 GASSONIC OBSERVER-i Set/view channel 2 data 0x0014 format Code 0, 1, 2, 3 CH2 Format (8N1, 8E1, 801, 8N2) Software Rev Embedded software minor ASCII 0x0015 Alphanumeric revision chars Numeric 0x0016 Reset Alarms Set to clear all alarms Value Shows the stages of...
  • Page 58 GASSONIC OBSERVER-i VENT OGGING EGISTERS Read/Set run-time seconds Numeric Run Time Hi 0x0030 0 – 65535 High word Value Read/Set run-time seconds Numeric Run Time Lo 0x0031 0 – 65535 Low word Value Real Time Read/Set year and month of Numeric 1 –...
  • Page 59 0 – 23 hour Clock Time Hi byte = Minute, Lo byte Numeric 0 – 59 minutes 0x004B second: Fault clock time Value 0 – 59 seconds Gassonic Observer-i fault Numeric See description 0x004C Fault Cause code Value Numeric Reserved...
  • Page 60 GASSONIC OBSERVER-i Numeric Total calibration event count 0 – 65535 0x005E Cal Count Value Numeric Clear All Set to clear all event logs 0x005F Value Events ISCELLANEOUS EGISTERS 0x0060 – Numeric User information registers 0 – 65535 User Info Value...

  • Page 61: Gassonic Observer-I Command Register Details

    WRITE: A write to the mode register (01) with the proper bit set will cause the Gassonic Observer-i to change modes. Not all modes can be activated in this manner. If an improper bit or the action is not allowed at...

  • Page 62: Primary Fault Status/Error 1 (02H)

    The display will show a “COM”. • Calibrate: This will put the Gassonic Observer-i into calibration mode. It will be ready for the 1701 to be activated. Calibration will not be allowed if a gas leak is above the trigger level instead an exception will be returned.

  • Page 63: Fault Status/Error 2 (03H)

    See the ERROR OUTPUT Section for explanation of errors. Bit 13 is special for Modbus and HART. When the Gassonic Observer-i is in acoustic test, this bit is set to “1” if the acoustic sound level is above the desired level, and to “0” – if it is below the desired level. This allows the system to quickly know if there is an acoustic test problem.

  • Page 64: Unit Temperature (08H)

    6.7.15. Comm 1 Baud Rate (10H) A read returns the Comm 1 baud rate of the Gassonic Observer-i. A write changes the baud rate to the requested baud rate. After the baud rate has been changed to the addressed unit, the Modbus communications will cease because the baud rate has changed;...

  • Page 65: Comm 1 Data Format (11H)

    6.7.16. Comm 1 Data Format (11H) A read returns the Comm 1 data format of the Gassonic Observer-i. A write changes the data format to the requested data format. After the data format has been changed to the addressed unit, the Modbus communications may cease or start producing Comm errors because the data format has changed;...

  • Page 66: Comm 2 Address (12H)

    6.7.18. Comm 2 Baud Rate (13H) A read returns the Comm 2 baud rate of the Gassonic Observer-i. A write changes the baud rate to the requested baud rate. After the baud rate has been changed to the addressed unit, the Modbus communications will cease because the baud rate has changed;...

  • Page 67: Software Rev Minor (15H)

    EXCEPTIONS - If an illegal data value is entered (must be between 0-1), then the Exception Code 03 (Illegal Data Value) is returned. If the Gassonic Observer-i hears a gas leak greater than the trigger when the command is received a Code 06 (device busy) exception will be returned.

  • Page 68: Relay State (1Ah)

    EXCEPTIONS - If an illegal data value is entered (must be between 0-1), then the Exception Code 03 (Illegal Data Value) is returned. If the Gassonic Observer-i hears a gas leak greater than the trigger when the command is received a Code 06 (device busy) exception will be returned.

  • Page 69: Cal Abort (1Fh)

    GASSONIC OBSERVER-i 6.7.30. Cal Abort (1FH) Writing to the calibrate abort register will abort calibration and return the Gassonic Observer-i to normal. 6.7.31. Comm 1 Total Illegal number of registers Errors (20H) A read indicates the total illegal number of registers errors on the Comm 1 Modbus. The maximum count is 65535 and then the counter rolls over to zero and begins counting again.

  • Page 70: Comm 1 Framing Errors (29H)

    GASSONIC OBSERVER-i 6.7.40. Comm 1 Framing Errors (29H) A read indicates the number of Comm 1 Framing Errors that occurred in the slave device. The maximum count is 65535 and then the counter rolls over to zero and begins counting again.

  • Page 71: Event Logging (30H – 5Fh)

    6.8. Event Logging (30H – 5FH) The Gassonic Observer-i logs Alarm, Fault, Calibration, and Maintenance events. Each event group will store a total of 10 events in a first-in-first-out manner. An identifying number and time stamp is also stored for each event.
  • Page 72 GASSONIC OBSERVER-i Item Description Number Hi Byte =Year, Low Byte = Month Hi Byte = Day, Low Byte = Hour Hi Byte = Minute, Low Byte = Second Table 26: Real Time Clock Time Format Real-time Clock Year, Month (0x32) This is used to read/write the real time clock.
  • Page 73 GASSONIC OBSERVER-i Alarm Clock Time: Day, Hour (0x42) Alarm Structure Mid These registers are described in Table 27 as item number 2. Alarm Clock Time: Minute, Seconds (0x43) Alarm Structure Low These registers are described in Table 27 as item number 3.
  • Page 74 GASSONIC OBSERVER-i Maintenance Running Time in Seconds, Low Word (0x50) This register reads the low word of the running time in seconds when the gas check event occurred. This time is in seconds since January 1, 2000. Maintenance Clock Time: Year, Month (0x51) These registers are described in Table 27 as item number 1.
  • Page 75 GASSONIC OBSERVER-i Total Calibration Event Counter (0x5E) This reads the total number of calibration events that have been stored in the unit. Clear all events (0x5F) Writing zero (0) to this register clears all event counters. Setting Clock Please see the table on the following page.
  • Page 76 GASSONIC OBSERVER-i Address Parameter Function Data Type Data range Access (hex) Structure time Hi byte – min, low Numeric value 0 – 65535 Warn byte – sec for warning event log entries Reserved Reserved Numeric value Reserved Reserved Numeric value...
  • Page 77 GASSONIC OBSERVER-i Address Parameter Function Data Type Data range Access (hex) Structure time Hi byte – day, low Numeric value 0 – 65535 Fault byte – hour alarm event log entries Structure time Hi byte – min, low Numeric value 0 –...

  • Page 78: User Data (60H – 6F)

    GASSONIC OBSERVER-i Address Parameter Function Data Type Data range Access (hex) Structure time Hi byte – min, low Numeric value 0 – 65535 Calibrate byte – sec for event log entries Calibrate code Numeric value Calibrate Reserved Reserved Numeric value...

  • Page 79: Set Cut-Off Frequency (E2H)

    GASSONIC OBSERVER-i 6.8.13. Comm 2 Overrun Errors (78H) A read indicates the number of Comm 2 Only Overrun Errors that occurred in the slave device. The maximum count is 65535 and then the counter rolls over to zero and begins counting again.

  • Page 80: Customer Support

    Phone: +971-4-8143814 Jebel Ali, Dubai Fax: +971-4-8857587 United Arab Emirates Email: gmme@generalmonitors.ae Table 28: General Monitors Locations *The Gassonic Observer-i is manufactured at this location Area Phone/Fax/Email United States/International MSA Corporate Center: Toll Free: +1-877-672-3473 1000 Cranberry Woods Drive Phone: +1-724-776-8600 Cranberry Township, PA 16066 Email: info@MSAsafety.com...

  • Page 81: Appendix

    8.1. Warranty General Monitors, an MSA Company, warrants the Gassonic Observer-i to be free from defects in workmanship or material under normal use and service within two years from the date of shipment. General Monitors will repair or replace without charge any such equipment found to be defective during the warranty period.

  • Page 82: Specifications

    < 1 s (speed of sound) Response Time HART, Modbus Communication Max. cable length between Enhanced Mode (ANN) Observer-i and power source @ Cable (@ 0.1 kg/sec): Requirements 24 VDC (20 ohm) 2.08 mm2 FQHI setting: 17 meters (56 ft.) (14 AWG) –...

  • Page 83: Electrical Specifications

    4.01 0.823 20.95 6.39 0.519 33.31 10.15 Table 31: Resistance of Copper Wire Based on a 24 volt supply and 15 volts at the Gassonic Observer-i the recommended wire sizes are shown below. FEET METERS 5.27 15000 4573 3.31 9434 2880 2.08...

  • Page 84: Approvals

    GASSONIC C OBSERV VER-i Use th he following f formula to cal culate the wir re size: Cable e drop per wir re equals (Ein n – voltage at instrument)/2 = (24 -15) )/2 = 4.5 volts s per wire...

  • Page 85: Spare Parts And Accessories

    GASSONIC OBSERVER-i 8.3. Spare Parts and Accessories To order spare parts and/or accessories, please contact the nearest Gassonic Representative or, Gassonic directly, and give the following information: • Part Number of Spare Part or Accessory • Description of Spare Part or Accessory •...

  • Page 86: Microphone Replacement

    GASSONIC OBSERVER-i 8.3.5. Microphone Replacement To replace the microphone, pull out the foam windscreen and unscrew the windscreen support assembly. Unscrew the microphone. Check to make sure that the new microphone (805773-1) has two spring-pin contacts. Be careful not to cross-thread the microphone as it is installed. It should screw in smoothly.

  • Page 87: Sound Source Assembly Replacement

    GASSONIC OBSERVER-i 8.3.6. Sound Source Assembly Replacement To replace the sound source assembly (805554-3), loosen the 2 M4 screws. Remove the old sound source assembly and discard the O-ring. Replace the new O-ring and plug the two-pin connector into the sound source assembly. Tighten the two M4 screws. Perform a Sound Source Calibration (See section 8.4) and a Forced Acoustic Test, Section 4.5.2.
  • Page 88 GASSONIC OBSERVER-i When doing the "7-UP" the output level will default to the maximum level. This means that the sound level displayed will be at the maximum amplification. There are now two scenarios: 1. The sound level is between 80 dB and 110 dB.
  • Page 89 Product Disposal Considerations This product may contain hazardous and/or toxic substances. EU Member states shall dispose according to WEEE regulations. For further Gassonic product WEEE disposal information please visit: www.generalmonitors.com/faqs All other countries or states: please dispose of in accordance with existing federal, state and local...

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