Crowcon F-Gas Detector
Contents
1. 5 Specifications Measuring Principle Range Resolution Start up time Size Weight Ingress Protection Power Analogue Output Repeatability Linearity Operating Temperature Humidity Pressure Response Time Approvals F Gas Detector Instructions Non dispersive infrared NDIR 0 1000ppm 1ppm lt 120 seconds 151 x 80 x 60mm W x H x D Total width with cable gland 102mm 0 25Kg IP54 12 28Vdc 4 20mA current source can also be set to 0 20mA 0 2V 0 5V 0 10V 1 of full scale 2 of full scale 20 C to 40 C 0 95 RH non condensing 800 1200mBar 30 seconds approximately EMC EN50270 This product is designed for non hazardous area operation only CROWCON Detecting Gas Saving Lives F Gas Detector Instructions 6 Product options The required gas calibration must be stipulated when ordering a detector Refer to the labels fixed to the detector to determine the target gas Exposure Detector Part Number Limit HCFC 22 CHCIF Chlorodifluoromethane 1000ppm T2 700105 03002 R22 EH40 STEL HCFC 123 CHCI CF3 2 2 Dichloro 1 1 1 SOppm T2 730105 03002 R123 trifluoroethane OSHA PEL Pure Fluids HFC 125 CHF Pentafluoroethane 1000ppm T2 720105 03001 R125 OSHA PEL HFC 134a CH FCF 1 1 1 2 1000ppm T2 710105 03003 R134a Tetrafluoroethane EH40 STEL Blended Fluids Used in Refrigeration Air Conditioning Market Refrigerant Co2. THORNE amp TaD DERRICK INTERNATIONAL www thorneandderrick com gt CROWCON Detecting Gas Saving Lives Crowcon F Gas Detector Infra Red SF and Refrigerant Gas Detector Installation Operating and Maintenance Instructions M070029 Issue 1 January 2014 F Gas Detector Instructions Table of contents E a2 2 eee eee ee E A eee A eee een A E eee eee ee 3 MUN SE AFA OUN prercreernse tears end thc ese ees cane erect EE E n E a 4 2 1 Operating voltage and analogue outputs general c ccc cecc cece eeeeeeeeeeseeeeeeneees 4 22e WASUAN AMOI eere rete creueeceecien cane lt oueecen EE EE E E N 5 2 3 Compensation of the ambient PreSSUre ccccceccecceeceeeeeeseeseeceeceeeeeeeeeeeeaeeneeeees T Oe PARU a E E E E E E T Sets Wing INSTUCUONS sesser rrna aoa EA EAE OEE ENE E ES T 3 2 Analogue output 0 4 20MA ccc ccccccccceeeceeceeeceeceeeseceaecaeeseeseeesaeeaeesseeseesaeeeaes 8 3 3 Us ofthe voltage OULD UN sisseseade iaa aia eiia iia iane iai 9 WNC OCS eea E E OEE ETTER 10 4 Operating the transmitter using the Key Pad cccccceccceccseeceeeeeeceeeeeeceeeseeeeeeseeeaeeees 11 A AEU 9 2 c E E E E eo eee 11 4 2 Regular operalidi n mserneresrrnnee an TE AEE E E iii 12 AO MAIO OIT e oaa er EE r ETE E EE EE E E E EERE E EEEE E 12 4 4 Device error Hardware error cccccecccecceecceeceeeceecseeeeeeseeeeeeseeeeeeseeeseeseeeeeseeeeaes 12 Aea NARA O e E E REE E S 12 4 6
3. Serap Na a nT za m E Li ae oe ane ar TN Figure 4 4 pin data cable connecting the IR sensor to the interface PCB Caution The IR sensor module is tailored to the connected interface PCB and must only be operated as a pair Both components form a fixed unit and must not be separated 2 2 Installation The installation of the transmitter is described as follows The F Gas detector should be mounted where the gas to be detected is most likely to be present The gas must come into direct contact with the sensor in order to be detected Detectors are typically installed around compressors pressurised storage vessels refrigerant cylinders within storage rooms or adjacent to pipelines Gas leaks typically occur from valves pipe flanges and joints pipe vessel filling or draining connections etc The following points should be noted when locating gas detectors e To detect heavier than air gases detectors should be mounted at low level e Detectors must be mounted as close as possible to potential leak sources e When locating detectors consider the possible damage caused by water rain flooding or exposure to jets from hoses or pressure washers e Consider ease of access for functional testing and servicing e Consider how the escaping gas may behave due to natural or forced air currents e Consider the process conditions For example heavier than air gases may rise if released from a process at elevated temp
4. Exiting maintenance mode without accepting any Changes cccecceceeeeeeeees 12 4 7 Exiting maintenance mode taking over changes ccccsecceeceeceeeeeeeeeaeeeeeseeees 13 4 8 Restoring factory SettinGS ccccccccccceceeecceeeeeeeeeeseeeeeeseseeeseeeseeseeseeeeeeseeseeeeees 13 A ZERI Call FAV OMN ae E EE EE 13 4 10 SPANCA AUO eeren EERE E E EARE 14 4 11 Information sheet process of operation and displays ccceeceeeeeeeeeeeeeeees 16 F PECHAN e a eta ens EE E AE iE 17 0 od 210 6 6 86 6 0 9 i enn NE E EEEE 18 Fe NAGY NY cacao acer acted oo coats vs Hecate vce ace we EEE E E neces ose eer acme aenmeeet arhcneeetecomeses 19 The equipment described in this manual is designed for the detection of toxic gases Ensure local safety procedures are adopted before carrying out any maintenance or calibration work The equipment described in this manual may be connected to remote alarms and or shutdown systems Ensure that local operating procedures are adopted before carrying out any maintenance or calibration work CROWCON Detecting Gas Saving Lives F Gas Detector Instructions 1 General The F Gas detector provides the benefits of the IR gas sensor technology within a robust enclosure Rear Casing Interface PCB Front Casing Figure 1 F Gas Detector Layout The sturdy IP54 protected casing houses the IR sensor a user interface with LED status indication and the
5. exited as described in chapter 4 7 Without this process for instance when severing the operating voltage all changes will be lost 4 10 SPAN calibration The SPAN calibration is only possible from level 1 of maintenance mode refer to diagram in section 4 11 this is a self contained process Thus even new data which have been gained from SPAN calibration must be taken over or deleted explicitly when exiting the entire maintenance mode see Chapter 4 7 The self contained part of the SPAN calibration can be regarded as a second level of maintenance mode The SPAN calibration level can be activated for 3 seconds by typing SPAN for 3 seconds If the entry was successful the STATUS LED will change from a steady yellow to flashing yellow In addition to this the SPAN LED will flash yellow Keep SPAN pressed for 3 seconds Now the user must supply the correct sample gas for the SPAN calibration with the help of the calibration adapter which is available as accessory If a stable value is found within a time window 60 seconds regarding the concentration and this value is found in a plausible value range the SPAN LED will change from flashing yellow to steady yellow within a time window of 60 seconds If the concentration found continues to be stable the SPAN LED will change from flashing yellow to steady yellow CROWCON Detecting Gas Saving Lives F Gas Detector Instructions Now the user is able to set the desired concent
6. interface electronics fig 1 Based on the physical measuring principle of infrared absorption apart from selectiveness this transmitter offers the best prerequisites for reliable and lasting detection even in a difficult environment The F Gas detector is able to detect even the smallest quantities of toxic gases reliably and to report its findings to a connected control system The gas concentration can be transmitted as a linear analogue current or voltage output The following signals are available as analogue values 0 4 20mA Linear the desired operating mode can be set via a link 0 2V Linear the desired operating mode can be set via a link 0 5V Linear the desired operating mode can be set via a link 0 10V 10V setting requires at least 15V DC as supply voltage Important the F Gas detector is not certified for use in a hazardous area Any form of maintenance parameterization and all changes to the settings of the device must only be carried out by trained and authorized staff CROWCON Detecting Gas Saving Lives F Gas Detector Instructions Never attempt to dismantle this device by yourself in order to tamper with its hardware or to alter its software Any mechanical damage such as opening of glued pipe connections or gaskets or the loosening of screws will result in the termination of all liability and warranty granted by Crowcon Detection Instruments Ltd 2 Installation 2 1 Operating voltage and analog
7. possibly carried out changes the button UP must be pressed for 3 seconds CROWCON Detecting Gas Saving Lives F Gas Detector Instructions The STATUS LED will then change to signalization flashing red for 3 seconds and the change to Regular operation mode indicated by the STATUS LED light up green Generally maintenance mode will also be exited without taking over any changes if the user has not made any entries for 30 minutes Caution Maintenance mode can only be exited from level 1 An indication for level 1 is the STATUS LED lighting up yellow refer to diagram in section 4 11 4 7 Exiting maintenance mode taking over changes If maintenance mode should be exited taking over all changes the button DOWN should be pressed for 3 seconds DOWN to be pressed for 3 seconds The STATUS LED will then change to flashing green to signalize this and after that change to Regular operation mode with the STATUS LED light up green Caution maintenance mode can only be exited from level 1 An indicator for level 1 is that the STATUS LED lights up yellow refer to diagram in section 4 11 4 8 Restoring factory settings This function deletes any previously made changes carried out by the user and restores the factory settings of the transmitter The module addresses as well as the calibrated values are not affected by this Press DOWN 6 times in a row for 6 seconds without any errors If the restoration has been c
8. purpose This form may be downloaded from our website crowconsupport com along with a returns label alternatively we Can email you a copy Instruments will not be accepted for warranty without a Crowcon Returns Number CRN It is essential that the address label is securely attached to the outer packaging of the returned goods Units returned to Crowcon as faulty and are subsequently found to be fault free or requiring service may be subject to a handling and carriage charge Warranty Disclaimer The guarantee will be rendered invalid if the instrument is found to have been altered modified dismantled or tampered with Any service by 3rd parties not authorized amp certified by Crowcon will invalidate the warranty on the equipment Use of alternative manufacturer s sensors which have not been approved by Crowcon will invalidate the warranty of the product as a whole The warranty does not cover misuse or abuse of the unit Sensor types have individually defined warranty periods which can differ from the hardware warranty period Crowcon reserve the right to amend warranty periods for particular applications Sensor warranty is rendered invalid if the sensors have been exposed to excessive concentrations of gas extended periods of exposure to gas or have been exposed to poisons that can damage the sensor such as those emitted by aerosol sprays CROWCON Detecting Gas Saving Lives F Gas Detector Inst
9. type cable gland is fitted suitable for cable with a maximum diameter of 5mm Crowcon strongly recomends installation using screened cables to avoid signal interference 3 2 Analogue output 0 4 20mA The analogue output of the transmitter offers two options for reading out the measuring data 1 Current signal in the region of 0 20mA linear to the measuring value 2 Current signal in the region of 4 20mA linear to the measuring value This option also facilitates the easy detection of a broken wire or the failure of the sensor Alternatively the analogue output can be set as a voltage signal using links JP4 JP5 JP6 More information regarding this can be found in sub section 3 3 The mode of the current signal can be selected using the jumper JP3 1 Not connected 0 20mA factory settings 2 Connected 4 20mA Nal a ce Rael Figure 8 Link JP3 for rat tit Ch selection of current mode 4 20mA setting is shown fa cae T CE m Bui Ai ti TA dieses Link JP3 Caution switching between current modes with the link must only be carried out when the power is turned off disconnect supply voltage For the purpose of the analogue signal 0 20mA or 4 20mA the transmitter can be regarded as a Current Source transmitter The F Gas detector can be connected directly to a suitable control system taking care to connect the V and GND terminals to the appropriate connections on the controller Once the power su
10. user must apply the correct sample gas for the ZERO calibration using the available calibration adapter typically air or nitrogen In case of doubt please contact the supplier If a stable value is found within a time window 60 seconds regarding the concentration and this value is found in a plausible value range the ZERO LED will change from flashing yellow to steady yellow Now the user is able to set the desired concentration value of the output signal by using the UP and DOWN keys For this the relevant set value can be monitored live at the analogue output Pressing the UP or DOWN keys for longer will lead to an auto repeat This feature is helpful for the adjustment for a larger range Exiting the ZERO calibration can be carried out any time by pressing ZERO for 3 seconds Keep ZERO pressed for 3 seconds If the action was successful the STATUS LED will change from flashing yellow to flashing green for 3 seconds subsequently changing to lighting up yellow one is still in level 1 of maintenance mode and is still able to carry out system change In the case of an error in connection with the ZERO calibration the STATUS LED will change from flashing yellow to flashing red for 3 seconds subsequently changing to a steady yellow one is still in level 1 of maintenance mode The changed calibration values were not taken over This process has to be repeated Caution The changes only become effective when the maintenance mode has been
11. Other link functions JP1 reserved for future use RS 485 termination JP2 factory use only 3 4 Wire breaks Should the communication between the IR sensor and the interface electronics be disrupted during the operation of the transmitter unintentional disconnection or wire break this status will be displayed at the power output as follows Operation with 4 20mA gt Output current will be frozen at 2mA Operation with 0 20mA gt the current value last issued will be frozen Depending on the operating mode and the subsequent evaluation aforesaid status can be used for error detection If the fault is repaired the transmitter will restart automatically with the regular startup phase then resume regular operation Note If the operating mode 0 20MA was selected the frozen current value will be maintained until the completion of the new start up phase In general the reliable detection of a wire break is only possible in operating modes 4 20mA CROWCON Detecting Gas Saving Lives F Gas Detector Instructions 4 Operating the transmitter using the key pad The control panel figure 10 of the transmitter is integrated in the front cover This is required if zero or span calibration has to be carried out The following operating and display functions are available Display elements STATUS LED 3 colours red yellow green SPAN LED LED yellow ZERO LED LED yellow Operating elements UP button SPAN but
12. eratures and or pressures CROWCON Detecting Gas Saving Lives F Gas Detector Instructions The placement of sensors should be determined following advice of experts having specialist knowledge of gas dispersion and the plant processing equipment as well as safety and engineering issues The agreement reached on the locations of sensors should be recorded Gently prize open the flaps using a screw driver being careful to not damage the flaps see fig 5 a Figure 5 Opening flaps to get access to the internal parts of the transmitter Remove the front casing fig 6 Figure 6 front casing removed CROWCON Detecting Gas Saving Lives F Gas Detector Instructions Mount device vertically to the wall using the 4 screw holes fig 7 with the cable gland pointing downwards Figure 7 mounting holes Mounting hole spacing 127 5mm x 62 5mm Mounting hole diameter 4mm Warning never install the detector with the front panel facing upwards Doing so may lead to the IR sensor filter becoming blocked by dust contaminants which could prevent gas from reaching the sensor 2 3 Compensation of the ambient pressure In order for the transmitter to be as flexible as possible and to facilitate the use both at sea level and in higher regions the so called real gas formula must be taken into account As a result of the physical properties of gases the density will change depending on the relevant al
13. ghtly from the exact concentration during the warm up period Once the start up phase is completed and all the test routines have been carried out with positive results the transmitter will change to its regular mode making the measured gas concentration available via the interfaces In case a fault was detected during the start up phase the transmitter will change to the operating mode faulty see 4 3 CROWCON Detecting Gas Saving Lives F Gas Detector Instructions 4 2 Regular operation During regular operation the STATUS LED will show green throughout The system is operating faultlessly within its measuring parameters The gas concentration values will be indicated by the interface signal 4 3 Malfunction Malfunction STATUS LED will flash red is active if the concentration level is above or below the defined limits to a degree that a violation of the measurement range has to be considered This device status is reversible Once the concentration is back to its defined range the STATUS LED will automatically change to green light see regular operation 4 4 Device error Hardware error A device or hardware error STATUS LED lights up red without flashing indicates irreversible damage which always requires a device service as in most cases the change or repair of a component is necessary If still possible an analogue value will be set which indicates a fault 4 5 Maintenance Crowcon recommends
14. mposition Exposure Limit Detector Part Number Components OSHA PEL R404a R143a 125 134a 1000ppm T2 740105 03001 R407a R32 125 134a 1000ppm T2 750105 03001 R407c R32 125 134a 1000ppm T2 800105 03001 R410a R32 125 1000ppm T2 7 60105 03001 R507 R143a 125 1000ppm T2 70105 03001 Speciality fluids Fluid Exposure Limit Detector Part Number R1234yf CH CFCF 2 3 3 3 500ppm T2 780105 03001 Tetrafluoropropene OSHA PEL Insulating Gas Exposure Limit Detector Part Number EH40 SF Sulphur Hexaflouride 1000ppm STEL T2 600105 00006 1250ppm LTEL Accessories Calibration adaptor enables test gas to be applied to the sensor Part number C03658 CROWCON Detecting Gas Saving Lives F Gas Detector Instructions 7 Warranty This equipment leaves our works fully tested and calibrated If within the warranty period 1 year the equipment is proved to be defective by reason of faulty workmanship or material we undertake at our discretion either to repair or replace it free of charge subject to the conditions below Warranty Procedure To facilitate efficient processing of any claim contact our customer support team on 01235 557711 with the following information Your contact name phone number fax number and email address Description and quantity of goods being returned including any accessories Instrument serial number s Reason for return Obtain a Returns form for identification and traceability
15. ompleted successfully the STATUS LED will flash green for 3 seconds then changing to lighting up yellow one is still in level 1 of maintenance mode one is still able to carry out more system changes lf an error is detected in the entering of the data the STATUS LED will flash red for 3 seconds then changing to light up yellow one is still in level 1 of maintenance mode The factory settings have not been restored The process has to be repeated Caution The changes only become effective when the maintenance mode has been exited as described in chapter 5 1 7 Without this process for instance when severing the operating voltage all changes will be lost 4 9 ZERO calibration ZERO calibration can only be carried out from level 1 of the maintenance mode being a self contained process refer to diagram in section 4 11 For this reason any new data collected from the ZERO calibration must be taken over or deleted explicitly when exiting the entire maintenance mode see Chapter 4 7 The self contained part of the ZERO calibration is similar to a second level in the maintenance mode The ZERO calibration mode can be activated by pressing the button ZERO for 3 seconds If the entry was correct the STATUS LED will change from lighting up yellow to flashing yellow In addition to this the ZERO LED will flash yellow CROWCON Detecting Gas Saving Lives F Gas Detector Instructions Keep the ZERO pressed for 3 seconds Now the
16. or SPAN T a SPAN 6 ange scan roken ZERO 6 ZERO ZERO S L b T i Sensor O gt 5o broken 2 9 3s later D i O no key for 30min Ma oN ha a N N STAT gt STAT J STAT oo Measure Exit 1 Exit Wi 3s raD SPAN e a Decale SPAN _ A all SPAN _ okay PIN err changes changes Do momet mo OM mO PIN code correct UP for s 1 DOWN for 3s E DOWN in 6s read factory default Si later K g STAT a STAT y STAT ed Service r Exit 2 Exit 2 Basic SPAN e X lt Discard SPAN _ register SPAN _ Level 1 change change key err ZERO C timeout a ZERO ERO C L A L S L key err f Zo timeout gt 2 lt lt 6x UP in 6s soe N ZERO oc o l for 3s E N A D 4 N STAT C STAT STAT v Service Service Service SPAN SPAN P ZERO SPAN C new SPAN scan scan PIN ZERO 2 ZERO C ZERO L y L A A LL ony key any E 5 es T gt S pe SPAN C N A N STAT C STAT C LED flashing Service Service SPAN _ SPAN C ZERO SPAN C LED on stable stable ZERO ZERO C LED off So A Cae FL ere offset tune for 3s UP DOWN SPAN for 3s gain tune Maintenance mode access code factory settings UP UP SPAN ZERO DOWN DOWN Must be entered faultlessly within 6 seconds CROWCON Detecting Gas Saving Lives
17. pply has been connected the transmitter becomes active and is running see chapter 5 CROWCON Detecting Gas Saving Lives F Gas Detector Instructions The analog current output is able to indicate several different conditions This complies with the NAMUR NE43 standards 0 to 2 8mA Fault 3 2 to 3 6mA Under range 3 6 to 3 9MA Under run detection range 4 to 20mA Detection range 20 to 21mA Over run detection range 21 to 21 5mA Over range gt 21 5mA Fault 3 3 Use of the voltage output In some applications it is necessary to read the output signals of the transmitter as a linear voltage signal For this purpose the relevant link JP4 6 has to be connected Figure 9 Figure 9 Link JP4 6 for selection of output voltage 10V DC setting is shown Depending on the selected operating mode the following modes can be set 0 20mA JP3 not connected 4 20mA JP3 connected Only one of the following jumpers must be connected at any given time 0 2V JP4 Span zu O N 0 5V gt JP5 connected SOEN LauiO Ole 26mA open CROWCON Detecting Gas Saving Lives F Gas Detector Instructions 0 10V JP6 connected 15V DC supply voltage required When using the above mentioned configuration the following voltage values can be connected at the output Q 20mA JP3 not connected 4 20mA JP3 connected 2V JP4 OV 2V 0 4 V 2V 5V JP5 OV 5V 1 0V 5V 10V JP6 OV 10V 2 0V 10V
18. ration value of the output signal by using the UP and DOWN keys For this the relevant set value can be monitored live at the analogue output Pressing the UP or DOWN keys for longer will lead to an auto repeat This feature is helpful for the adjustment for a larger range It is possible to exit the SPAN calibration at any time by pressing SPAN for 3 seconds Keep SPAN pressed for 3 seconds If the action was successful the STATUS LED will change from flashing yellow to flashing green for 3 seconds subsequently changing to lighting up yellow one is still in level 1 of maintenance mode and is still able to carry out system changes In the case of an error in connection with the SPAN calibration the STATUS LED will change from flashing yellow to flashing red for 3 seconds subsequently changing to a steady yellow one is still in level 1 of maintenance mode The changed calibration values were not taken over This process has to be repeated Caution The changes only become effective when the maintenance mode has been exited as described in chapter 4 7 Without this process for instance when severing the operating voltage all changes will be lost CROWCON Detecting Gas Saving Lives F Gas Detector Instructions 4 11 Information sheet process of operation and displays Power ON ia oN a N a gt STAT J STAT s STAT Measure R Startup Failure ensor oe of SPAN Ss nd Sens
19. ructions Crowcon Regional Addresses THORNE amp Ta DERRICK INTERNATIONAL www thorneandderrick com A HALMA COMPANY Detecting Gas Saving Lives
20. the detector is zeroed and tested with gas every 12 months as a minimum The sensor may be zeroed in clean air and the target gas must be applied at a known concentration to verify correct sensor response Calibration gas should be applied using the Calibration Adaptor accessory part number C03658 at a flow rate of 0 5 litres per minute If internal settings are to be changed e g calibration parameters factory settings addresses access codes the system has to be switched to maintenance mode A ZERO or SPAN calibration for example is only possible after the maintenance mode has been activated In case of a device error the system cannot change to maintenance mode In order to get to maintenance mode a pre defined access code factory settings UP UP SPAN ZERO DOWN DOWN must be entered faultlessly within 6 seconds Such an access code always consists of exactly 6 keystrokes which must be entered one after the other within 6 seconds If the access code is correct the system will change to the first level of the maintenance mode STATUS LED will light up yellow If the access code is incorrect or not entered fast enough the STATUS LED will signalize an error by flashing red for the second In this case the maintenance mode will not be activated the transmitter ill remain in regular or faulty mode 4 6 Exiting maintenance mode without accepting any changes If the maintenance mode should be exited without taking over any
21. titude and due to this fact the absorption of the IR radiation inside the measuring cell will change accordingly Without any pressure compensation it would lead to inaccuracies in the measurement of the concentration and possibly to faulty data As the ambient pressure must be taken into account when measuring the concentration in diffusion mode a pressure sensor is already integrated firmly in the transmitter For this reason no setting or parameterization by the user is required 3 Start up 3 1 Wiring instructions Electrical connections are made via the connector ST1 see Figure 2 In order to avoid any errors and damage the system must be mounted while the power has been switched off It is imperative that the following order is observed 1 Switch off the power 2 Mount the transmitter in the desired position While doing this adequate distance to live parts must remain in order to avoid short circuits and damage 3 The installation in the vicinity of ventilators windows ventilation shafts and similar facilities must be avoided Any air flow or drought near the transmitter may lead to inaccurate readings and false alarms or inadequate function CROWCON Detecting Gas Saving Lives F Gas Detector Instructions 4 Connect a 3 core cable from the control system to the appropriate V 12 28Vdc analogue signal and GND OV terminals The cross section of the cables used should not exceed 1 5mm A compression
22. ton ZERO button DOWN button Figure 10 Display key pad The transmitter can be calibrated and several settings can be made using the display key pad 3 colour STATUS LED indicates the current operating status Only one of the three colours u 7 is active at any given time In addition to this the conditions off on and flashing exist The SPAN and ZERO LEDs have a special purpose At any given time only one of these two LEDs can be active The three conditions off on and flashing exist here as well 4 1 Start up phase After the power supply and the selected interfaces have been connected the transmitter will begin the start up phase STATUS LED will flash green This will take less than 2 minutes and this time is used to check all internal components During the start up phase the analogue value issued shows the minimum value the concentration shows 0 Depending on the operating mode selected the following conditions can occur during the start up phase In 0 20mA mode Output current OmA After approx 2 minutes 2 OMA depending on the pending gas concentration During the warm up period the sensor signal may still deviate slightly from the exact concentration In 4 20mA mode Output current approx 2mA then a jump to approx 4mA After about 2 minutes 2 4mA depending on the pending gas concentration The sensor signal may show values of less than 4mA as it can still deviate sli
23. ue outputs general The F Gas detector is designed to operate in a range of an input voltage of 12 to 28Vdc A faultless operation is guaranteed within these parameters Supply voltage fluctuations must be kept as small as possible All connections used for supply and output signals are available from connector ST1 fig 2 and can be accessed by opening the transmitter casing see fig 2 DE ae OTHE TTETt ae E i 0 ee f beac eee ha ih E UL C Fie LI Laal Ti ki FIE toh na ig iii iii Figure 2 Opened transmitter casing with interface electronics Connection of the supply voltage 12 to 28Vdc Analogue output signal optionally 0 20mA 4 20mA or 0 to 2 5 10V OV common ground for V and RS485 not yet implemented Non inverted signal line for the integrated RS485 interface not yet implemented Inverted signal line for the integrated RS485 interface not yet implemented Figure 3 connector ST1 connection for power supply analogue output and the RS485 interface CROWCON Detecting Gas Saving Lives F Gas Detector Instructions The connection of the internal IR sensor module to the interface electronics is via a 4 pin data cable Fig 4 The circuit board is screwed to the internal built in casing from the outside The IR gas sensor is integrated into this casing to minimize the dead volume and to protect it from any unwanted external effects ws ea AS
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