FGD3 Oxygen & Toxic Sensors
Contents
1. FGD3 Oxygen amp Toxic Sensors User Manual Analox Ltd 15 Ellerbeck Court Stokesley Business Park North Yorkshire TS9 5PT UK T 44 0 1642 711400 F 44 0 1642 713900 W www analox net E info analox net FGD3 Oxygen amp Toxic Sensors User Manual List of Contents 1 Nice a ee 3 1 1 Installation ae er anna haare langer 4 1 1 1 Siting ETT E To E EL 4 1 1 2 Wireterminatlon pcm 4 14 3 Cable routing eie ebenen 4 14 4 Cable amp screening d tee beer re teen 4 2 Installation in a non hazardous 5 2 1 Installation in a hazardous 6 3 Monu mode selection deeem a alas 7 ORE p c 8 MEES Dig cp 8 3 3 FSD anna nannten nee 8 3 4 Setting 4MA level ttti ebene 9 9 5 Setting ZOMAlOVEl 9 S6 DISPIAY MODE eo 9 3 Display firmware version ee ea ia 9 EN TACSTOMS PERIERE LEE 10 3 9 View engineer diagnostics 11 3 10 Setcross CE 11 3 11 Positive zero 12 3 12 Negative zero 12 3 13 acie m 13 4 FGDS head indications enne enne enr senten nenas 14 4 1 Normal conditions u intento nennt eet rne2. 2012 NA LO Page 12 FGD3 Oxygen amp Toxic Sensors User Manual 3 13 Password This option is used to allow the user to limit the option available for users by means of a password Press MENU to open the menu system Using the NEXT and PREVIOUS buttons select menu option E 30 Press ENTER Using the up button toggle the display between OFF amp On Press ENTER to store the new value Note Pressing the MENU button rather than the ENTER button exits without any change e Press MENU to close the menu system Note If the password should be obtained from Analox Ltd before selecting the On setting The password limits the user to menu options 1 2 4 and 5 NA LO Document Ref P0102 807 00 June 2012 Page 13 FGD3 Oxygen amp Toxic Sensors User Manual 4 FGD3 head indications 4 1 Normal conditions The FGD3 gas detector head will display a steady reading for gas levels between 0 and FSD 4 2 High gas conditions The FGD3 gas detector head will flash between the gas reading and Hi when the gas reading is above the sensor FSD This will coincide with the head drawing a current of 20 to 25mA from the control unit thus ensuring the control unit is aware of the high condition 4 3 Fault conditions The FGD3 gas detector head will flash between F xx and the gas reading when the reading falls below 10 of the sensor FSD This will coincide with the head drawing a current of less than 2 5mA from the control unit t
3. certain restrictions on the parameters of the interconnecting cables used Consult the barrier manufacturers data for further information Barriers must be selected to restrict the 1 5 supply to the gas detectors within the following parameters Gas detector Terminals Umax Linas Pin Ci Li FGD3 oxygen and 30V 0 15A 0 81W 10nF 0 or toxic When considering the capacitance and inductance allowable across the barrier output terminals there is 10nF capacitance and zero inductance between terminals and on any model of FGD detector X i 28m LOOP 2 4 Note The control unit OV is not connected to Earth Hazardous Area Safe Area Note If an MCU control unit is being used then the Analox I S output module type FGDIO can be used to provide the necessary 1 5 outputs This module is located within the MCU enclosure see P0102 800 MCU 3 amp 4 Hardware Manual for details Document Ref P0102 807 00 June 2012 NA LO Page 6 FGD3 Oxygen amp Toxic Sensors User Manual 3 Menu mode selection In order to gain access to the menu switches and test points release the screw situated between the letters A and T of the chrome STATUS label on the detector head front panel The screw does not need to be completely removed only release it far enough so that the STATUS label can rotate revealing the calibration switches and test points The buttons and test points are designated as follows
4. ntn etia rn bene Ra eau HER Pea en REN anne 14 4 2 High g s condlitlOris eerie 14 4 3 FAUIt COMMONS Rm 14 5 15 56 MOUMtING details E 17 7 Comical ESAE UE TI DL 18 8 Certificate of 19 NA LO Document Ref P0102 807 00 June 2012 Page 1 FGD3 Oxygen amp Toxic Sensors User Manual Document Ref P0102 807 00 June 2012 NA LO Page 2 FGD3 Oxygen amp Toxic Sensors User Manual 1 Introduction Analox Ltd FGD3 and toxic detector heads are 4 20mA loop powered gas detectors designed to monitor gas levels in the atmosphere The sensor type fitted within the head dictates the gas type to be monitored and the range to which the head is sensitive The detectors use the industry standard 4 20mA current loop to convey the gas levels to a control unit This means that under zero gas conditions 4mA is drawn from the supply and under full scale gas conditions 20mA is drawn from the supply The current varies linearly for gas levels between zero and full scale FGD3 Atex gas detector head with plug in sensor FGD3 Atex gas detector head with internal sensor NA LO Document Ref P0102 807 00 June 2012 Page 3 FGD3 Oxygen amp Toxic Sensors User Manual 1 1 Installation 1 1 1 Siting the sensors Mounting positions for sensors need
5. to determine the sensor output under zero gas conditions e Apply zero gas to the sensor inlet and allow enough time for the sensor to respond and all the gas to be purged typically 2 minutes minimum dependent upon flow rate e Select menu mode 1 and press ENTER e Press ENTER to perform the ZERO calibration Pressing MENU instead of ENTER aborts the calibration the ZERO factor will still be displayed on exit e Press MENU the display will show the ZERO factor for the instrument before returning to its standard mode of operation The ZERO factor should be recorded on any calibration certificates 3 2 Sensor span This calibration feature allows the instrument to determine the sensor output when it is exposed to a know concentration of gas e Apply a known concentration of gas to the sensor inlet and allow enough time for the sensor to respond e Select menu mode C 2 refer to section 3 and press ENTER e Using the UP and DOWN buttons adjust the displayed reading so that it matches the calibration gas concentration e Press ENTER to perform the SPAN calibration Pressing MENU instead of ENTER aborts the calibration the SPAN factor will still be displayed on exit e Press MENU the display will show the SPAN factor for the instrument before returning to its standard mode of operation The SPAN factor should be recorded on any calibration certificates 3 3 Select FSD The FSD value is usually matched to the sensor fitte
6. Intrinsic safety EN50018 2000 Electrical apparatus for potentially explosive atmospheres Flameproof endosure d Notified Body for Hazardous Area Certification Notified Body for ATEX Quality Assurance Notification Baseefa Baseefa Rockhead Business Park Rockhead Business Park Staden Lane Buxton SK 17 9RZ UK Staden Lane Buxton SK17 9RZ UK Notified Body Number 1180 Notified Body Number 1180 Hazardous Area Certificate Number ATEX Quality Assurance Notification Number Baseefa 01 ATEX2300 9 1126 EEx ia 2056 T4 20 C lt lt 60 Place of Manufacture ISO 9001 2008 Quality Management System Mansfield Nottinghamshire UK Date mark applied see product Certificate No GB93 1938 2004 108 EC Electromagnetic Compatibility Harmonised Standards Used EN50270 2006 Electromagnetic compatibility Electrical apparatus for the detection and measurement of combustible gases toxic gases or oxygen Authorised Signatory to this declaration on behalf of the manufacturer Name W R Baxter Title Managing Director Address Status Scientific Controls Ltd Hermitage Lane Industrial Estate Kings Mill Way Mansfield Nottinghamshire NG18 United Kingdom Signature bat Date 15 04 11 NA LO Document Ref P0102 807 00 June 2012 Page 19
7. O Document Ref P0102 807 00 June 2012 Page 9 FGD3 Oxygen amp Toxic Sensors User Manual 3 8 Restore The firmware for the detector head is common to infrared CO HC pellistor oxygen and toxic instruments This feature allows the type of sensor fitted to be selected Important The instrument supplied with this manual has either an oxygen or toxic sensor installed Changing the setting within this menu will not change the gas to which the sensor responds e Select menu mode C 8 refer to section 3 and press ENTER e Use the UP button to toggle the sensor type see table below e Press ENTER Pressing MENU instead of ENTER aborts the feature e Press MENU to return the instrument to its standard mode of operation Sensor type Range display O2 1 0 to 25 vol 0 0 to 20 9 non linear O2 2 0 to 25 vol linear 0 0 to 20 9 02 3 0 to 1000ppm 0 to 1000 linear 5 ppm 0 0 to 5 0 Elt2 10 ppm 0 0 to 10 0 EIt3 20 ppm 0 0 to 20 0 Elt4 50 ppm 0 0 to 50 0 Elt5 200 ppm 0 to 200 EIt6 500 ppm 0 to 500 Elt7 1000 ppm 010 1000 Elt8 9999 ppm 0 to 9999 This feature will erase all the configuration settings of the detector head and replace them with the instruments default values for the sensor selected Following the use of this feature the instrument must have a full calibration including the 4 20mA loop Note A linearization algorithm is applied to the O2 1 sensor type as supplied by City Te
8. around the mounting position so that this action is not restricted Fixings required 2 off M6 fasteners Rawl bolts or similar dependent on mounting wall construction NA LO Document Ref P0102 807 00 June 2012 Page 17 FGD3 Oxygen amp Toxic Sensors User Manual 7 Certification The FGD oxygen and toxic gas detectors carry the following markings AN A LOX GAS DETECTOR TYPE FGD3 1180 Il 2 G EExia II C T4 200 lt Ta lt 60 BASEEFA BASO1ATEX2300 SERIAL No MANUFACTURER STATUS SCIENTIFIC CONTROLS LTD MANSFIELD NOTTINGHAM NG18 5ER UK Vi 30V 1i20 15A 0 81 Ci 10nF Li 0 WARNING STATIC HAZARD DO NOT RUB WITH DRY CLOTH Document Ref P0102 807 00 June 2012 NA LO Page 18 FGD3 Oxygen amp Toxic Sensors User Manual 8 Certificate of conformity We declare that on the date the equipment accompanied by this declaration is placed on the market the equipment conforms with all technical and regulatory requirements of the directives listed below Description of Equipment The FGD1 3 Series of Fixed Gas Detectors for the detection of Oxygen Taxic or Flammable gases ATEX Certified intrinsically safe for use in Group IIC hazardous locations Directive 94 9 EC ATEX Standards Used EN50014 1997 Amds 1 amp 2 Electrical apparatus for potentially explosive atmospheres General requirements EN50020 1994 Bectrical apparatus for potentially explosive atmospheres
9. chnology Document Ref P0102 807 00 June 2012 N A LO Page 10 FGD3 Oxygen amp Toxic Sensors User Manual 3 9 View engineer diagnostics data This feature is a view only feature No configuration changes are possible from within this menu This information is for the use of the installation engineer only e Select menu mode C 9 refer to section 3 and press ENTER e display will alternate between the current value and code C 9x where x is 0 Sensor reading 4 Detector counts e The mode of operation can be selected by pressing the UP button e Press MENU to return the instrument to its standard mode of operation Note1 The diagnostic structure is compatible with other gas types and as such certain features are not available N A Note2 The diagnostic option 95 is only of use where a four electrode electro chemical sensor is fitted 3 10 Set cross reference Menu mode C 12 This option is used to allow the user to calibrate the sensor with a commonly available gas e g methane or propane but use the unit to detect a different gas e g methanol or acetone etc This is achieved by adjusting the cross reference factor according to the difference in signal that is detected for the calibration gas compared to the target gas Press button 1 to open the menu system Select menu mode C 12 refer to section 3 and press ENTER Press ENTER Using the INCREASE and DECREASE buttons buttons 3 amp 4 se
10. d If the sensor is say a 0 to 20 ppm chlorine sensor then the FSD is set to 20 It is possible to transmit a lower range on the 4 to 20 mA signal by reducing this value to say 10 ppm This function does not affect the sensor calibration but does change the maximum reading that can be measured Note Changing this value outside the sensor s operating range may make the FGD3 unsuitable for its intended use e Select menu mode C 3 refer to section 3 and press ENTER e Using the UP and DOWN buttons adjust the displayed reading until the desired setting is displayed e Press ENTER to save the setting Pressing MENU instead of ENTER aborts the calibration the sensor FSD factor will still be displayed on exit e Press MENU the display will show the sensor FSD for the instrument before returning to its standard mode of operation Document Ref P0102 807 00 June 2012 N A LO Page 8 3 4 FGD3 Oxygen amp Toxic Sensors User Manual Setting 4mA level This calibration feature allows the instrument to simulate a condition of zero gas so that the 4mA output can be set 3 5 Attach a multimeter set to measure DC voltage between test points TP1 and TP2 Select menu mode C 4 refer to section 3 and press ENTER Using the UP and DOWN buttons adjust the reading displayed on the multimeter to 40mV 0 5mV Press ENTER to store the 4mA calibration data Pressing MENU instead of ENTER aborts the feature Press MENU the display
11. elle Helle UP DOWN TP1 TP2 ENTER MENU Several calibration modes exist in the detector head and these are accessible via the instruments simple menu system To select a menu mode follow this procedure e Press the MENU button and C 1 appears on the display e Press UP or DOWN until the required menu mode is displayed on the screen e Press ENTER to select the menu mode e To exit the menu mode press MENU While the instrument is in a menu mode any data displayed on the screen will alternate between the menu number and the reading If the password is set the user will be prompted with PASS when the MENU key is pressed The user has the option of ignoring the password by simply pressing the MENU key in this case a limited menu system is offered or entering the correct password to gain access to the full menu options The FGD3 menu system is as follows Cal number Function Section 1 Zero sensor 3 1 Sensor span 3 2 3 Select FSD 3 3 4 Setting 4mA level 3 4 5 Setting 20mA level 3 9 6 Display mode 3 10 7 Display firmware version 3 7 8 Restore 3 8 9 View engineer diagnostics 3 9 data 12 Set cross reference 3 10 19 Positive zero suppression 3 11 20 Negative zero suppression 3 12 30 Password 3 13 N A LO Document Ref P0102 807 00 June 2012 Page 7 FGD3 Oxygen amp Toxic Sensors User Manual 3 1 Zero sensor This calibration feature allows the instrument
12. hus ensuring the control unit is aware of the fault condition Note xx is a number that defines a particular fault as follows 1 Checksum error 2 Zero calibration error 4 Span calibration error 8 Sensor reference low output 16 Sensor reference high output 32 Sensor detector low output 64 Sensor detector high output Note Multiple faults may be shown i e F 6 indicates that there is a zero and span calibration error Document Ref P0102 807 00 June 2012 N A LO Page 14 FGD3 Oxygen amp Toxic Sensors User Manual 5 Sensor replacement Note Applies only to instruments fitted with an integral sensor Arrangement A a Inhibit the channel at the control unit b Disconnect power to the head at the control unit c Release the sensor retainer d Unplug the sensor from the PCB e Push the new sensor into the PCB making sure of the pin alignment f Refit the sensor retainer 0 Allow the sensor to stabilise for 1 to 2 hours prior to calibration h Calibrate the detector head i Enable the channel at the control unit Sensor Sensor retainer Em M NA LO Document Ref P0102 807 00 June 2012 Page 15 FGD3 Oxygen amp Toxic Sensors User Manual Arrangement B Inhibit the channel at the control unit b Disconnect power to the head at the control unit Release sensor hou
13. r head Refer to the connection diagrams on the following pages for further information The oxygen and toxic detector heads require a two wire connection to the control unit current loop to head current loop return to control unit Document Ref P0102 807 00 June 2012 NA LO Page 4 FGD3 Oxygen amp Toxic Sensors User Manual 2 Installation in anon hazardous location When a detector head is installed in an area where there is no potential of an explosive gas hazard present the cable lengths to the detector are limited solely by the resistance of the cable The FGD3 gas detectors require a minimum of 8V between the Sig and terminals to allow them to operate correctly For systems operating at 24V the maximum cable loop resistance is therefore 24 8 25mA i e 6400 Control Unit 3 oV 2 59 diagram above shows connections for FGD1 2 detector head in non hazardous location The pin numbers shown at the control unit refer to pin numbers on the input modules within the MCU control units Refer to manufacturer if alternative control unit is used NA LO Document Ref P0102 807 00 June 2012 Page 5 FGD3 Oxygen amp Toxic Sensors User Manual 2 1 Installation in a hazardous location When used in a hazardous area the FGD3 detector requires an intrinsically safe power supply This can be provided by using proprietary safety barriers The use of barriers to create an 1 6 supply imposes
14. sing by undoing the locking ring or splashguard adaptor depending upon which is fitted d Unscrew the two M4 screws of the terminal box chassis and remove e Remove the sensor housing from the detector f Unscrew the four countersunk screws from the sensor housing cover plate to reveal the sensor g Remove the sensor and replace with the new sensor taking note of the wire positions and colour codes h Replace the cover plate and tighten the four screws Replace the sensor housing locking ring or splashguard adaptor j Refit the terminal box chassis to the instrument k Allow the sensor to stabilise for 1 to 2 hours prior to calibration I Calibrate the detector head m Enable the channel at the control unit Sensor housing Fd Splashguard adaptor Locking ring Document Ref P0102 807 00 June 2012 NA LO Page 16 FGD3 Oxygen amp Toxic Sensors User Manual 6 Mounting details The diagram below shows the mounting centres for the FGD detector head enclosure 122 102 l i V 102 122 140 V Depth 75mm approx Note The front panel lid of the detector head opens to allow access to the screw terminals situated inside Sufficient space should be allowed
15. t the required cross reference factor Press ENTER to store the new value Press button 1 to close the menu system Ask Analox Ltd for advice on settings NA LO Document Ref P0102 807 00 June 2012 Page 11 FGD3 Oxygen amp Toxic Sensors User Manual 3 11 Positive zero suppression This option is used to allow the user to suppress small amounts of positive sensor zero drift The setting can be set between 0 and 10 of the sensor range as set by the FSD value Press MENU to open the menu system Using the NEXT and PREVIOUS buttons select menu option E 19 Press ENTER Using the INCREASE and DECREASE buttons set the required zero suppression value e Press ENTER to store the new value Note Pressing the MENU button rather than the ENTER button exits without any change e Press MENU to close the menu system 3 12 Negative zero suppression This option is used to allow the user to suppress small amounts of negative sensor zero drift The setting can be set between 0 and 10 of the sensor range as set by the FSD value Press MENU to open the menu system Using the NEXT and PREVIOUS buttons select menu option E 20 Press ENTER Using the INCREASE and DECREASE buttons set the required zero suppression value e Press ENTER to store the new value Note Pressing the MENU button rather than the ENTER button exits without any change e Press MENU to close the menu system Document Ref P0102 807 00 June
16. to be considered individually some points for consideration are e Ensure all sensors are mounted to allow routine calibration and maintenance to be carried out as required e Ensure the proposed site will not interfere with movement of existing equipment e g cranes doors etc Install all cables neatly and securely Sensors for detecting gases that are lighter than air should be positioned at a high level Sensors for heavier than air gases should be located at below head height Avoid siting the sensors adjacent to potential sources of radio frequency interference e g radio transmitters control switchgear motors etc 1 1 2 Wire termination All connections should be made according to the appropriate sensor or loop diagram for the configuration required It is advised that bootlace ferrules or flat blade crimps be used for tidy and reliable connections of wires into the Detector Head connectors 1 1 8 Cable routing Due to the low signal levels generated by gas detectors it is recommended that all wiring to the sensors be segregated away from AC mains or other high voltage power lines to avoid interference 1 1 4 Cable amp screening The use of a screened cable is recommended for the installation of all detector heads The correct strategy for connecting the screens depends upon the area in which the detector head is to be used i e hazardous non hazardous In all cases the screen should not be connected at the detecto
17. will show the DAC 4mA calibration factor for the instrument before returning to its standard mode of operation Setting 20mA level This calibration feature allows the instrument to simulate a condition of full scale gas so that the 20mA output can be set A control unit connected will indicate full scale gas also and enter its alarm state 3 6 Note Attach a multimeter set to measure DC voltage between test points TP1 and 2 Select menu mode C 5 refer to section 3 and press ENTER Using the UP and DOWN buttons adjust the reading displayed on the multimeter to 200mV 0 5mV Press ENTER Pressing MENU instead of ENTER aborts the feature Display mode Select menu mode C 6 refer to section 3 and press ENTER Use the UP and DOWN button to move the decimal point to the desired setting Press ENTER Pressing MENU instead of ENTER aborts the feature Press MENU to return the instrument to its standard mode of operation Changing the decimal point will not result in a more accurate reading 3 7 Display firmware version The firmware version is displayed as part of the start up procedure but can be viewed without powering down the instrument via menu option 7 Select menu mode C 7 refer to section 3 and press ENTER The display will show the firmware version number Press ENTER Pressing MENU instead of ENTER aborts the feature Press MENU to return the instrument to its standard mode of operation N A L
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