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Crowcon Txgard-IS+ Fixed Gas Detector

1. 24 6 Ea lt finding RE RPM 26 Appendices Appendix A Wiring the TXgard IS to Crowcon control equipment 31 Appendix B TXgard lS specification enne 35 Appendix C Spare parts cs ILIAD an URS 37 Appendix D Ment SVSlam i iie d i HD ERU UE edie 38 Appendix E 4 20 mA LOOPS E P 46 Appendix F Cabling requirement a 48 Appendix G Sensor limitations assises 51 Warranty Statement asisten nna tinta nnns 51 Introduction TXgard IS 1 1 1 2 INTRODUCTION Product overview TXgard IS is an Intrinsically Safe detector for toxic gases or oxygen It is suitable for use in Zone 0 1 or 2 or Division 1 Division 2 hazardous areas when used with a suitable Zener barrier or galvanic isolator TXgard IS is designed to detect a wide range of gases when fitted with the appropriate electrochemical sensor Gases include oxygen carbon monoxide and hydrogen sulphide For a full list of supported sensors please contact Crowcon TXgard IS is a loop powered instrument providing a 4 20 mA signal suitable for direct connection to a control panel Unlike most other 4 20 mA gas detectors featuring operator display panel LCD and keypads it combines its power and signal in just two wires so only one barrier is required The instruments are supplied with the mA pre calibrated so the
2. OV Channel 116115114131121110 9 8 7 6 5 4 3 Connecting the TXgard IS to a Crowcon Gasmaster The TXgard IS is connected to a Gasmaster control panel as shown below The Gasmaster input channel link should be set to SINK and the input channel should be configured as DET 4 20 SINK For hazardous area installations refer to the Gasmaster manual Figure A 3 Electrical connections for Gasmaster Channel Link Settings EXTERNAL BARRIER Safe Area FIRE sik 88 TXgard IS SRCE ma 9 SCR ov 0156 Q PWR 4 20 mA Current Sink Gasmaster Detector Input Terminals 33 Issue 7 CROWCON Appendix A TXgard IS Connecting the TXgard IS to a Crowcon Gasflag The TXgard IS is connected to the Gasflag via the screw terminals marked SENSOR VE this is the TXgard IS positive supply and SENSOR SIG which connects to TXgard IS negative supply Set links LK10A and LK10B to SOURCE position B Figure A 4 Electrical connections for GasFlag Connecting a TAgard IS to a GasFlag PCB inside front panel PCB on rear of GasFlag supply to T amp gard IS4 supply to TXgard IS4 5 CROWCON Issue 7 34 TXgard IS Appendix B APPENDIX B TXGARD IS SPECIFICATION Dimensions 160 x 123 x 92 mm 7 3 x 5 x 3 6
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4. Minimum 3 mA Clean Air mA or Gas Level None Minor or Major None Light Medium or Heavy 30 secs 1 5 or 10 minutes No timeout Minimum 3 mA 24 mA or Gas Level If enabled the instrument will only ever draw a maximum of 20 mA no matter what the gas value When the instrument is in inhibit mode or calibration mode the instrument outputs an inhibit current to prevent false alarms whilst gas is applied When inhibit current value is set to Gas Level the loop current is not inhibited Defines the size of the dead band about the zero point of the device This will suppress unwanted spurious signals and improve stability at zero Suppression may be set to 3 levels with increasing levels of suppression Damping is the means where noisy gas readings may be smoothed out However increasing the amount of damping in order to reduce the amount of noise will be at the expense of sensor response time This sets the timeout value before a menu display will automatically return to the normal display mode if there is no response or input from the user No timeout will disable the timeout option This selects the current the instrument will sink when a fatal error has been detected Note the option gas level is available this means the instrument will ignore the error for the purposes of loop current a display message will still flash as normal Issue 7 42 TXgard IS Appendix D
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7. CROWCON TXgard IS Intrinsically Safe Toxic and Oxygen Gas Detectors b3 CEOVZCGON 5 ppm CO 4 3 mA OK TXgard IS Loop Powered Electrochemical and Galvanic Sensor Types Only Installation operating and maintenance instructions M07214 Issue 7 January 2010 Tel 44 0 191 490 1547 THORNE amp Fax 44 0 191 477 5371 a z Z BH Hm Email northernsales thorneandderrick co uk DE R R CK UJ K Website www heattracing co uk www thorneanderrick co uk A HALMA COMPANY Contents 1 IIBRUQGUCWUQDUZ Lu peteret oa vega suan 5 Prod ct oVervieW s sau UYUB 5 Product description each ect Z R R s bini 5 2 Installation e n ua 8 General aun Geel Se eus u u nha S tas 8 Moutig ese PL 9 Cabling requirement u una aa pasa la aussi eE 9 Electrical connections asesinan teen eto tee cete tend 10 3 Operation et ine ree e RR TEE age n cn eden 13 The operator display panel and keypad 13 Using the TXgard IS menus sse 14 4 COMMISSIONING cnp hol ah aes 16 Commissioning procedure Toxic gas detectors eee 16 Commissioning procedure Oxygen detector 5 nin IR niveum 21 5 Maintenance 5 icc cer he t ge rege eee 24 Routine mairitenarnce uuu uuu ie dede tete te reae o ea Rer euo 24 Sensor replacement and servicing of detectors
8. Here we can count on 22 V at the control panel and with a maximum current drain of 20 mA we will lose 250 300 36 2 ohms x 0 02 amps 11 7 V so the detector will always have at least 10 3 V However we have to ensure it does not have its fault current set to 24mA or it will only get 7 9 V For longer cable lengths use cable with 1 5 or 2 5 mm cores see section 2 3 for resistance values Note 1 You might only need to allow for up to 20 mA depending on how the instrument is configured The signal can be limited to the range 4 20 mA using the Limit 20 mA option in the Configuration menu see Appendix D Otherwise the instrument increases signal gas current to a maximum of 24 mA Fault and Inhibit currents can be programmed to be 24 mA in the Configuration menu if desired but most control panels use 3 mA or less to signal faults 49 Issue 7 5 CROWCON Appendix F TXgard IS Note 2 It is worth noting that most 28 V Zener barriers are 300 Q which will give another 6 V drop With an 18 V supply and a 250 Q sense resistor this would give a voltage at the end of an 80 loop of min 18 6 6 2 4 V which is not enough to drive the TXgard IS which requires 8 V or more Therefore when using Zener barriers and high value sense resistors ensure the supply voltage is a good 24 V thus e g 24 6 6 2 10 V Obviously if you have configured the instrument to draw no more than 20 mA see Note 1 the situation
9. hydrogen sulphide damage may occur over time to metal components Sensors may be cross sensitive to other gases If unsure contact Crowcon or your local agent When used in dusty environments detectors should be inspected regularly as dust may block the sensor and prevent gas from being detected Warranty Statement This equipment leaves our factory fully tested and calibrated If within the warranty period 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 44 0 1235 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 CROWCON Issue 7 51 TXgard IS Fault finding Obtain a Returns form for identification and traceability 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 The guarantee will be rendered invalid if the
10. mA does not need re calibration in the field The keypad and operator display panel allow access to many powerful features to help installation and maintenance such as true one man calibration signal current can be ramped to a desired value to help set up control panels configurable fault and inhibit currents configurable display options displaying line voltage no need to access test points inside unit Product description TXgard IS comprises of two main parts The junction box contains the circuitry including the PCBs an operator display panel and keypad The sensor is contained in the sensor housing Figure 1 1 on page 6 The sensor comes in a re usable bayonet sensor housing which is standard for all gas sensors The sensor housing screws into an M20 entry on the junction box All electrical connections to the detector are made through the terminal blocks on the baseboard 42 and J4 see and in Figure 1 1 on page 5 The junction box of TXgard IS has one top entry M20 cable CROUVCON Issue 7 5 TXgard IS Introduction entry for customer use as standard Side entry versions and gland adapters are available contact Crowcon for details The Personality Module mounted on the baseboard comes in two varieties Toxic and Oxygen It converts the sensor output into a standard signal which can be interpreted by the processor The Personality Module contains a memory chip with calibration da
11. 4 20 mA loop is a standard method of connecting remote instruments to a control panel The basic concept is that a reading of zero gas corresponds to 4 mA and full scale gas corresponds to 20 mA The control panel supplies typically 24 volts down 2 wires and measures the current flowing in the loop The remote instrument in this case a gas detector controls the current The constant 4 mA is used to run the instrument processor amplifier etc This is termed a loop powered current sink circuit In this case the control equipment is providing or sourcing the current and the detector is receiving or sinking the current The detector is consequently termed a current sink and the control equipment must be configured to act as a current source Figure E 1 CONTROL EQUIPMENT CONTROL EQUIPMENT INSIDE THE TXgard IS V CONSTANT y n t 01035 VARIABLE 0 16mA LOAD CURRENT SENSE RESISTOR yo TXgard IS TXgard IS LOOP POWERED 2 WIRE INSTRUMENTS CURRENT SINKS Current loops are often more resistant to radio frequency interference than a simple voltage reading and they will generally work down long cables e g over a kilometre When using current loops care must be taken that the voltage drop of the maximum signal usually 20 mA down the line does not reduce the line voltage below 8 V which is the minimum working volta
12. 4 Selectthe Zero Cal gas menu The submenu list for zeroing and calibrating the gas appears 5 Move the cursor down and select the Calibrate gas menu item The panel will display a scrolling text message Apply calibration gas to instrument 6 Apply calibration gas typically half or full scale to the detector at a flow rate of 0 5 litre minute Crowcon Flow Adaptor part No C03005 Sticky gases which are rapidly absorbed by connecting pipes chlorine nitrogen dioxide and ozone are applied at 1 litre minute 7 Select the Q button TXgard IS Crowcon Flow Adaptor To clean air A or exhaust waw pipe Allow gas reading to stabilise 5 CROWCON Issue 7 19 TXgard IS Commissioning Gas reading 150 ppm co Use 4 to edit Use and buttons to adjust gas reading to calibration gas value Gas value is usually measured in ppm or as vol ppb and LEL are also available as appropriate See Table 4 1 on page 21 for some gases and their typical range Please note that detectors can be provided in different ranges if required Contact Crovvcon for list of all gases detected Select the button to set the calibration value The instrument will display the following message Calibrating When complete the instrument will report a scrolling text message Calibration successful Remove gas from the instrument Remove the ga
13. Dee ee mem o Fatal mA Non fatal mA Display option LCD Contrast Pwr on inhibit Help screen Minimum 3 mA 24 mA or Gas Level Minimum 3 mA 24 mA or Gas Level No display Normal display mA display Contrast adjustment Enable disable Enable disable Issue 7 This selects the current the instrument will sink when a fatal error has been detected Note the option gas level is available this means the instrument will ignore the error for the purposes of loop current a display message will still flash as normal This selects the current the instrument will sink when a non fatal error has been detected Note the option gas level is available this means the instrument will ignore the error for the purposes of loop current a display message will still flash as normal This selects what information is displayed on the normal gas display screen Normal means the gas level and flashing OK is displayed mA display also displays the loop current and no display suppresses all information Pressing the up and down arrows will increase and decrease the display s contrast Pressing RETURN copy in symbol from cell above will return to last menu Selects whether the detector output is automatically inhibited for 30 seconds after power up The output current level while in inhibit mode is set using the Set Inhibit mA menu If further help is enabled the menu
14. Inhibit mode the detector output will be forced to a level setin the Set Inhibit mA menu Inhibit will then be shown on the normal gas level display Inhibit mode will time out after five minutes or can be manually reset using the inhibit mode option CROUVCON Issue 7 38 TXgard IS Appendix D The display should look as follows Inhibitactive Press dto go on Gas Calibration Menus Description The gas calibration menus provide the instructions and means to calibrate the instrument This menu is different for toxic detectors and oxygen detectors The Toxic detector has two menu items one to zero the unit and the other to set the calibration gas level The oxygen detector has only one menu item to set the oxygen level It is not required to manually zero an oxygen detector See Sections 4 1 and 4 2 for detailed step by step instructions for using these menus Menu Toxic detectors Zero Cal gas Submenu To main menu Zero gas Calibrate gas Zero gas This menu provides instructional guidelines to zero an instrument Calibrate gas This menu provides instructional guidelines to calibrate the gas on the instrument Menu Oxygen detectors Cal O2 20 9 gas Submenu To main menu Confirm O2 cal Cal O2 20 9 gas This menu provides instructional guidelines to set the oxygen level on an oxygen detector Note clean air is always considered to be 20 996 oxygen 39 Issue 7 5 CROUVCON Appendix
15. inches Weight 700g Operating voltage 8 32 V dc loop powered 4 20 mA Normal Output Signal 4 20 mA current sink Fault current Minimum 3 mA 24 mA or normal gas signal configurable Operating temperature 40 C to 65 C 40PF to 149 F Note Instrument operates and has been certified as Intrinsically Safe between 40 C and 65 C giving out a 4 20 mA signal proportional to measured gas but LCD will go blank at about 20 C The sensor s performance changes at extremes of temperature consult Crowcon if the detector will be exposed to ambient temperatures below 20 C or above 40 C Humidity 15 90 RH non condensing for most sensors Display 2 x 16 character LCD Response time typical Too approximately 20 seconds for most Toxic sensors 10 seconds for Oxygen Repeatability 2 FSD 6 months Cable loop resistance 300 Q with 22 V supply at 20mA Degree of protection IP65 when fitted with VVeatherproof Cap Explosion protection Intrinsically Safe AApproval codes 9 II 1G Ex ia IIC T4 40 C to 65 UL cUL CI I Div 1 Groups A B C D Safety certification nos Baseefa 08 ATEX 0069X UL E147777 IECEx BAS 08 0028X X Special Conditions for Safe Use Warning Static Hazard Clean Only with a Damp Cloth 35 Issue 7 5 CROUVCON Appendix B TXgard IS Standards EN60079 0 safety in flammable atmospheres EN60079 11 intrinsic safety EN50022 emissions IEC61000 4 immunity EN50270 EMC for ga
16. inhibit its mA output for 30 seconds after povver up to prevent false alarms while the sensor is settling Step 2 Checking the 4 20 mA loop current This step can be omitted as the TXgard IS is delivered pre calibrated hovvever if you vvish to check the 4 20 mA loop 16 Issue 7 CROWCON Commissioning TXgard IS Step 3 current then it can be checked as outlined below Alternatively the TXgard IS provides a facility to force a known current through the loop Refer to the Ramp mA menu item in Appendix D for instructions NOTE there is no need to disconnect a sensor when calibrating mA The mA control circuit is completely independent from the gas measuring circuit 1 Connect a digital voltmeter DVM across test points TP 1 and TP2 on the baseboard Figure 1 1 on page 6 or Figure 2 2 on page 9 The loop current flows through a sense resistor between these test points so a 4 mA loop current will show as 40 mV on the DVM and 20 mA will show as 200 mV Zeroing the detector in clean air Before commencing zeroing the detector ensure the instrument is in clean air NOTE Oxygen sensors do not need manual zeroing with the TXgard IS See section 4 2 for calibration instructions 1 Enter the menu system by pressing the o button 2 Atthe password prompt enter the password by default this is the down button 5 times 3 You should now be in the main menu Refer to menu structure Figure 3 4
17. instrument is found to have been altered modified dismantled or tampered with The warranty does not cover misuse or abuse of the unit Any warranty on batteries may be rendered invalid if the use of an unauthorized charger is proven Non rechargeable batteries are excluded from this warranty Warranties on sensors assume normal usage and will be 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 Warranty Disclaimer Crowcon accept no liability for consequential or indirect loss or damage howsoever arising including any loss or damage arising out of the use of the instrument and all liability in respect of any third party is expressly excluded This warranty does not cover the accuracy of the calibration of the unit or the cosmetic finish of the product The unit must be maintained in accordance with the Operating and Maintenance Instructions The warranty on replacement consumable items such as sensors supplied under warranty to replace faulty items will be limited to the unexpired warranty of the original supplied item Crowcon reserves the right to determine a reduced warranty period or decline a warranty period for any sensor supplied for use in an environment or for an application known to carry risk of degradation or damage to the sensor Our liability i
18. is improved Note 3 By loop resistance we mean the total resistance of both wires in the twisted pair cable that is one wire going to the detector and one returning For example an 80 loop resistance will be 40 Q out and 40 back Cable resistance values are usually quoted for a single conductor thus the value has to be doubled to correctly calculate the loop resistance CROUVCON Issue 7 50 Appendix G TXgard IS APPENDIX G SENSOR LIMITATIONS The sensors used in TXgard IS have limitations common to all such gas sensors and users should be aware of the points listed below Crowcon can advise on particular situations and suggest alternative sensors if the instrument is likely to experience extreme conditions Electrochemical gas sensors contain chemicals The chemicals performance changes at extremes of temperature consult Crowcon if the detector will be exposed to ambient temperatures below 20 C or above 40 C Extreme levels of humidity can also cause problems The sensors are rated for an average ambient of 15 9096 R H However they are used from the tropics to deserts to tundra without this normally being a problem Water should not be allowed to collect on the sensor as this may impede gas diffusion This is why the sensors are usually mounted on the bottom of the instrument Persistent exposure to high levels of toxic gas will shorten the life of the sensor If the high level gas is corrosive e g
19. mV Press the o key when finished Issue 7 44 TXgard IS Appendix D 5 To calibrate the 20 mA select the Calibrate 20mA menu item and repeat step 4 adjusting the voltage reading to 20 mA value nominally 200 mV Press the o key when finished 6 Exit the menu system Clear Faults Description Clears Faults from display and unit When the TXgard IS detects a fault a warning message will be displayed on the operator display panel Refer to the Fault Finding guide on page 26 to determine cause and solution to the fault For example if an instrument detects the line voltage dropping below 8 V it will flash the warning Supply voltage low even if the supply voltage recovers to warn you that there was a problem with the supply To clear a warning message from the TXgard IS detector To clear the warning message enter the TXgard IS menu system move the cursor down and select Clear faults menu item and press the key NOTE Error and Fault messages will remain on the operator display panel until they are cleared Selecting Clear Faults from the menu will remove them however if the fault re occurs the fault message will be displayed again S W version Description this menu item displays the software version of the detector Serial number Description this menu item displays the serial number of the detector 45 Issue 7 5 CROUVCON Appendix E TXgard IS APPENDIX E 4 20 mA LOOPS A
20. no need to open the main body of the instrument to 5 1 Routine maintenance detector ensure that the sensor does not become blocked There is no need to recalibrate mA 5 2 Sensor replacement and servicing of detectors To prevent spurious alarms whilst changing sensors either put the TXgard IS into Inhibit mode See Appendix D or 5 2 1 Detectors with bayonet type sensor housings replace these sensors 24 Issue 7 CROUVCOM Maintenance TXgard IS 1 Open the sensor housing by pushing in and turning simultaneously to release the bayonet fitting and expose the sensor 2 Remove the sensor from the sensor housing 3 Fit the replacement sensor checking the part number is correct This part number is labelled on the main body of the detector Observe the correct pin alignment with the PCB 4 Reassemble the sensor housing 5 The sensor should now be re zeroed and calibrated See Commissioning on page 16 For Oxygen sensors see Commissioning procedure Oxygen detector on page 21 CROUVCON Issue 7 25 q xipuedde ees ww 0212 MO SI eBeyoA Uli uuguoo 0 uonoun vui due sn 0 OZ JOU nq yw y je sjeuruue jueuunujsui y je A g Ajddns UB pue eouejsisaiJ jueoyiuDis se qeo Duo awos 9joN uoneJedo ejqeijeJ MO A lddns 40 A 8 gt Mo 00 10 A Z lt u lu A jddns 1e wod jsnipy 001 51 tli vui Qz y eui uo eBeyoA eu UBIH A Ajddns TXgard IS uoljesado
21. will display more detailed help messages The user will be presented with For error help press else RETURN Q9 ifa warning message is displayed P CROWCON Appendix D TXgard IS Calibrate mA Description The Calibrate mA menu provides a means of re calibrating the 4 20 mA loop current NOTE The TXgard IS detectors leave the factory with the 4 20 mA signal correctly calibrated This menu is provided for Service Engineers to adjust the calibration to match site control equipment which cannot itself be correctly calibrated Menu Calibrate mA Submenu To main menu Calibrate 4 mA Calibrate 20 mA Instructions The TXgard IS detector provides two test points to measure the signal current Connect a Digital Volt Meter DVM across the test points TP1 and TP2 Figure 2 2 on page 10 The loop current flows through a sense resistor between these test points so a 4 mA loop current will show as 40 mV on the DVM and 20 mA will show as 200 mV 1 Enter the TXgard IS menu system by pressing the o key followed by the down key five times 2 Move the cursor down and select the Calibrate mA menu item You are now in the Calibrate mA submenu 3 Move the cursor down and select the Calibrate 4 mA menu item The display should look as follows Use V to set 4mA and press d 4 Use the UP and DOWN keys to adjust the voltage reading on the DVM as required across the test points TP1 and TP2 nominally 40
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23. 1 A C LK2 ELK LK3 none LK4 4 20 LK5 24V LK6 C C LK7 24V At the rear of the Gasmonitor connect the instrument to the INPUT OUTPUT MODULE the section labelled DETECTING HEADS See Figure A 2 Choose the channel matching the input card The module consists of three rovvs of 16 channels the terminals to use are marked 60 107 The top rovv terminals 50 55 is not used vvith the TXgard IS The second row provides 24 V the third row provides 0 V The first two terminal blocks are reserved The remaining 16 channels marked 1 16 can be used to connect the TXgard IS for example to connect channel 2 connect the positive wire to terminal 64 and the negative wire to terminal 63 Figure A 2 shows a TXgard IS connected to channel 2 NOTE Gasmonitors will only recognise a 24 mA signal from TXgard IS as Fault Although Gasmonitors can also be configured to use less than 2mA as a Fault signal the minimum current that the TXgard IS can draw is 2 2 mA so TXgard IS will not trigger Gasmonitor s Fault if the TXgard IS Fault signal is set to minimum 2 2 mA CROWCON Issue 7 32 TXgard IS Appendix A Figure A 2 Electrical connections for Gasmonitor DETECTOR HEADS 106103100 97 94 91 88 85 82 79 76 73 70 67 64 61 0299 96 93 90 87 84 81 78 75 72 69 66
24. 1 The operator display panel and keypad The TXgard IS provides an operator display panel through a Liquid Crystal Display See Figure 3 1 The operator display panel allows you to communicate with the TXgard IS instrument through a series of text based menus Use the operator panel to calibrate the sensor adjust signal levels and resolve instrument errors You may also display information on serial number software version and adjusting advanced settings The operator display panel provides continual instrument status on the gas being sensed the gas reading and the loop current value A flashing OK indicates the system is operational see Figure 3 2 Press the down o button to display the voltage and temperature Figure 3 3 on page 14 this display vvill automatically return to the main display after a fevv moments Figure 3 1 Operator display panel and keypad LCD Liquid crystal display DCROWCON 5 ppm CO 4 3mA O TXgard IS DOWN key ENTER key Figure 3 2 LCD operator display panel UNITS Gas being detected or ppm 5 ppm CO eg CO H2S O2 4 5mA OK Loop current Flashing OK indicates system is working CROWCON Issue 7 13 TXgard IS Operation Figure 3 3 Power and temperature display after pressing DOWN key Power V Power 21 5V Temp 25 09 Temperature 3 2 Using the TXgard IS menus Three buttons are pr
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26. D TXgard IS Ramp mA output Description This menu item allows you to force the output loop current to a known value It does not calibrate the 4 20 mA loop current or affect any calibration values within the TXgard IS detector The TXgard IS provides convenient test points within the instrument to measure the loop current The test points TP1 and TP2 can be found on the baseboard Figure 1 1 on page 6 and Figure 2 2 on page 10 The loop current flows through a sense resistor between these test points soa 4 mA loop current will show as 40 mV on the DVM and 20 mA will show as 200 mV When would l use it Ramp mA output can be used to help calibrate and set up the control panel used with a TXGard IS detector by forcing a known current through the loop It is also useful for locking the output to a known level which will not trigger alarms whilst for example changing the sensor It is also useful if you suspect the current is no longer calibrated In this case it can be checked at test points TP1 and TP2 It is useful during installation to force the loop current to the maximum value 20 or 24 mA depending on configuration The installer can then confirm line voltage is at least 8 V at the instrument terminals at maximum current even with maximum voltage drops in the loop Instructions 1 Enter the TXgard IS menu system by pressing the o key followed by the down key five times 2 Move the cursor down and select th
27. S uoneuoJul JO Zp uonoegs pue q xipueddy ees syney sie O yun pue eyds p wou Synej 1e9 2 juauno doo yuloz r JO uomeJqije2 vwoz leiqileS Vuur eiqile nu uu ulew OL nu uiqns yw je1qileS jndjno vui jenuejy ynd no vu duiey jndjno o JUAUINIJSUI S92404 poul q uul jueuno Suu i nueui J8ujo eyds p o N VOQ sn uun e Je 1SII nuaw pou iiqruur seb o1 lt n JO SUI OM sMous Aejdsiq Jequunu IeH s Jequinu jenas shejdsiq Jequinu jeas UOISJ9A M S s Inej 12319 Vui jeiqileO y nd no yw dwe seb 6 0z ZO 122 lt seb e5 oi9Z poul q uul UOISIBA 8JEMjJOS uoISJ9A WS shejdsiq gt des u 15s di H Jiqiuui Uo IMd 1senuoo 491 uondo Aejdsig Vu e ej uoN yw Eje 4 jnoeuin nus Buldureq ssaiddns 0197 yw qiyu s ywoz p nur nu ui ulew oL nu uiqns uoneanByuo 5 seb 56 0c JO uomeJqije2 Je ZO uuguo nu ul ulew OL nu u qns J gt seb 66 0z ZO 120 pesues pue OIXOL S40 28 op uaBAXO sew s y NMOG 9 ex H3LN3 SseJd nuayy ulen OL AV IdSIQ 1VINYON SIp4eE5X L udd 0 NOOMOHOG 40 UOHEIGIED seb ajeiqujea nu
28. ation CROWCON Issue 7 9 TXgard IS Installation 2 4 Table 2 1 Maximum cable distances for typical cables Cross sectional Typical resistance Maximum area mm2 Q per km distance km Cable Loop 1 0 18 1 36 2 2 2 1 5 12 1 24 2 3 3 2 5 7 4 14 8 5 4 The acceptable cross sectional area of cable used is 1 0 to 2 5 mm2 The table is provided for guidance only Actual cable parameters for each application should be used to calculate maximum cable distance Assume each termination is 0 5 Q Electrical connections All connections to the 4 20 mA loop and sensor are made via the screw terminal connectors mounted on the baseboard in the junction box Figure 1 1 on page 6 For further information on how 4 20 mA current loops work see Appendix E For a worked example of how to calculate if the cable is suitable please see Appendix F Figure 2 2 below shows the baseboard in detail The terminals marked J4 should be connected to the control equipment using the appropriate and terminals For further details of wiring the TXgard IS to Crowcon equipment see Appendix A Figure 2 2 Baseboard Some baseboards may have J4 in yi this orientation Ancus TXgard IS BASEBOARD TWIST THESE gt KO D WIRES 2 SENSOR PERSONALITY 1 20 Fe 10 Issue 7 CROUVCOM Installation TXgard IS TXgard IS is a 4 20 mA si
29. ctor The detector may be connected to any of the four channels shown in Figure A 1 Figure A 1 Quad Channel Module Wires use left hand two positions eui Channel 1 Channel 2 A Y SV QUAD CHANNEL MODULE SWITCH POSITIONS bar Detector type selection switches Module Wires use 7 right hand two Channel 3 positions JINT Channel 4 NOTE Vortex has certain current levels hard wired as signals However TXgard IS is highly configurable and can be programmed to work with most control panels When connecting to a Vortex set the TXgard IS as follows Fatal and Non Fatal Fault Currents 3 mA Inhibit current 24 mA or Clean air level The latter is better for long cable runs less IxR drop 31 Issue 7 CROWCON Appendix A TXgard IS Set the Detector Type Switch for the appropriate channel to position 2 The switch can be found in the hatch on the side of the Quad Channel Module see Figure A 1 Connecting the TXgard IS to a Crowcon Gasmonitor The TXgard IS is connected to the Gasmonitor control panel via an INPUT OUTPUT MODULE at the rear of the Gasmonitor racking system The links for Toxic and Oxygen detectors are the same configure the INPUT card as follows LINK Make these connections LK
30. e Ramp mA output menu item by pressing The display should look as follows mA 4 0 22 7 Use V toedit NOTE The display shows the loop current and the voltage on the 4 20 mA line at the detector The voltage will fall as the instrument takes more current due to the voltage drops in the Zener barrier and J CROUVCON Issue 7 40 TXgard IS Appendix D cable The voltage must remain greater than 8 V at the instrument terminals for the instrument to function 3 Use the UP o and DOWN o keys to adjust the loop current value The current value vvill increment in 0 5 mA steps The default value of the loop current when the menu is first entered is 4 mA The loop current can be forced to 24 mA or reduced to 3 5 3 0 and Minimum output Press the key when finished NOTE on oxygen detectors a signal of 4 mA is likely to generate a low oxygen alarm at the control equipment 4 Exit the menu system Configuration The TXgard IS detector provides a configuration menu to set various options Below is a list of options the values that can be set and a description Menu Configuration Submenu To main menu Limit 4 20 mA Set inhibit mA Zero suppress Damping Menu timeout Fatal mA Non fatal mA Display option LCD Contrast Pwr on inhibit Help screen 41 Issue 7 5 CROUVCON Appendix D TXgard IS Deme Limit 4 20 mA Set inhibit mA Fatal mA P CROWCON Enable Disable
31. erating manual for the equipment CROWCON Issue 7 23 TXgard IS Maintenance 5 MAINTENANCE Repair of instruments it is a condition of Certification that damaged instruments may only be repaired by trained personnel Whilst replacement of sensors or personality modules is permitted by untrained personnel board level repairs must be carried out at main Crowcon offices which are listed on our website at www crowcon com The operational life of the sensors depends on the application frequency and amount of gas being seen Under normal conditions 6 monthly calibration with periodic exposure to test gas the life expectancy of the toxic sensors is 2 3 years and 2 years for the oxygen sensors Site practices will dictate the frequency with which detectors are tested Crowcon recommends that detectors be gas tested every month and recalibrated every six months To recalibrate a detector follow the steps in Section 4 1 for a toxic gas detector or Section 4 2 for an oxygen In dusty environments the detector should be tested more frequently to put the control system into Inhibit mode for this channel preferred or put the TXgard IS into Ramp mA mode to hold its output at 4 mA or 17 4 mA as appropriate typical ungassed toxic oxygen safe signals NOTE Ramp mA or Instrument Inhibit modes might time out before the sensor settles so inhibiting at the control panel end is preferable NOTE There is
32. ge of the TXgard IS See section 2 3 for further information on cabling requirements NOTE It is also possible to have 3 wire current loops In this case the instrument is powered by one pair of wires supply and 0 V and the 5 CROWCON Issue 7 46 TXgard IS Appendix E current signal is measured between the third wire and 0V Because 3 wire circuits don t depend on the current in the signal loop to power them they can also source current However they require more expensive Zener barriers to make them intrinsically safe and cannot be retrofitted into existing 2 wire installations without replacing the cabling 47 Issue 7 5 CROUVCON Appendix F TXgard IS APPENDIX F CABLING REQUIREMENT Cabling to TXgard IS must be in accordance with the recognised standards of the appropriate authority in the country concerned and must also meet the electrical requirements of the detector Crowcon recommends the use of 2 core twisted pair cable but there is no particular restriction as long as it can supply 8 V at 20 mA to the instrument Suitable weatherproof glands must be used Cable should be identified as being intrinsically safe by some means for example by having a blue sheath Alternative cabling techniques such as steel conduit may be acceptable provided that appropriate standards are met TXgard IS requires a dc supply of 8 32 V and is loop powered If mounting in a hazardous area do not use a higher voltage than t
33. he Zener barrier s rating usually 28 V Ensure there is a minimum supply of 8 V at the detector taking into account the voltage drop due to cable resistance and the sense resistance of the control panel to which it is connected For example a nominal dc supply at the control panel of 24 V has a guaranteed minimum supply of 18 V The circuit may demand up to 24 mA see note 1 Given a sense resistor in the control panel of 250 O dropping 6 V at 24 mA the maximum voltage drop allowed due to cable resistance is 18 8 6 4 V Thus the maximum loop resistance allowed is 4 V 24 mA 166 Q approximately Safe installation only relevant for installations in Hazardous Areas TXgard IS depends on the principle of Intrinsic Safety to prevent explosions This means that the energy stored in the instrument never reaches a level which could cause a dangerous spark capable of igniting gas Since some energy is stored in the cable the installation must consider the safety of the entire system Barrier Cable Instrument Fortunately the calculations are quite straightforward Connection to the safe area is via a zener barrier or galvanic isolator The barrier or isolator will have a maximum permissible set of L C and perhaps L R values printed on it Example MTL type 728 barrier Voc lt 28 12 V lg lt 93 mA C lt 0 083 uF La lt 3 05 mH J CROUVCON Issue 7 48 TXgard IS Appendix F This means that the barrier output w
34. ife The warranty period for the sensor begins from the date of shipment from Crowcon Detectors should be stored in a cool and dry environment where temperatures remain within the 0 20 C range Txgard S cas DETECTOR D CROWCON Abingdon United Kingdom 0X14 1DY Ui 28V li 93mA Pi 0 66W Ex 1G Enso Ex ia IIC T4 Ga 40 C to 65 C Baseefa 08ATEX0069X IECEx BAS08 0028X ea Warning Static Hazard Clean Only with a Damp Cloth Drg No 3671 CERT ISS2 TXgard IS GAS DETECTOR CLASSIFIED FOR INTRINSIC SAFETY FOR USE IN HAZARDOUS LOCATIONS Class I Division 1 Group A B C amp D 40 C STamb 5 65 C T4 Imax 93mA Cj 0 1nF V max 28v L j 10uH P 0 66W gig e UL us x 66Y6 Warning Substitution of Components May Impair Intrinsic Safety Understand Manual Before Operating Control Drawing TXISP 3841 A3 d TXgardIS ATEX UL and IECEx Intrinsically safe PP CROWCON Issue 7 TXgard IS Installation 2 INSTALLATION 2 1 General The detector should be mounted where the gas is most likely to be present The following points should be noted when locating gas detectors To detect gases that are lighter than air detectors should be mounted at high level Crowcon recommends the use of a Collector Cone part no C01051 To detect gases that are heavier than air detectors should be mounted at low level To detect gases with similar weight to air for example hyd
35. ill not exceed 28 12 V or 93 mA into the Hazardous Area due to the barriers internal clamps and fuse At these power levels you can attach up to 0 083 microfarads of capacitance and 3 05 millihenries of inductance and still be safe Example unsafe a 1 microfarad load would store enough energy 0 5 x C x V2 to potentially cause a spark capable of igniting gas TXgard IS has been designed to have as low a capacitance and inductance as possible to permit it to be cabled up with several kilometres of cable Example Control panel Zener barrier 2 u 1 km of 1 mm cable TXgard IS Nominal 24 V supply 300 ohm resistance 36 2 ohm loop 10 uH 0 1 nF guaranteed 22 V output max permissible load 860 uH 60 nF safety information 250 ohm current sense resistor 3 05 mH 0 083 uF Maximum L R ratio 25 uH ohm is marked on label Safe Area 1 HazardousArea You must refer to the cable specification to discover the exact values of capacitance and inductance In this example the total inductive load on the output of the zener barrier is 870 uH which is well below its 3 050 uH limit The capacitive load is only 60 1 nF which is below the 83 nF limit of the barrier So the system is Intrinsically Safe In addition to the safety of the system you must also consider will it work As described earlier in Appendix F you must check that the TXgard IS will get a minimum supply of 8 volts at the end of the cable
36. n calibrating mA The mA control circuit is completely independent from the gas measuring circuit 1 Connect a digital voltmeter DVM across test points TP1 and TP2 on the baseboard Figure 1 1 on page 6 or Figure 2 2 on page 9 The loop current flows through a sense resistor between these test points so a 4 mA loop current will show as 40 mV on the DVM and 20 mA will show as 200 mV Step 3 Calibrate Oxygen NOTE Unlike previous models it is not necessary to manually Zero Oxygen units 1 Enter the menu system by pressing the e button 2 Atthe password prompt enter the password by default this is the down button 5 times 3 You should now be in the main menu gt To gas display Inhibit mode V 4 Move cursor down and select the Cal 02 e 20 9 gas menu The submenu list for calibrating oxygen appears 5 Selectthe Confirm O2 cal menu item The instrument will display a scrolling text message Ensure the instrument is in clean air and the sensor has settled 22 Issue 7 CROUVCOM Commissioning TXgard IS 6 Press the button to start calibrating the detector The instrument will display the following message Calibrating When complete the instrument will report a scrolling text message Calibration successful 7 Press the button to continue and exit the menu system The instrument is now calibrated If the control equipment display requires adjustment consult the op
37. n respect of defective equipment shall be limited to the obligations set out in the guarantee and any extended warranty condition or statement express or implied statutory or otherwise as to the merchantable quality of our equipment or its fitness for any particular purpose is excluded except as prohibited by statute This guarantee shall not affect a customer s statutory rights Crowcon reserves the right to apply a handling and carriage charge whereby units returned as faulty are found to require only normal calibration or servicing which the customer then declines to proceed with For warranty and technical support enquiries please contact Customer Support Tel 44 0 1235 557711 Fax 44 0 1235 557722 Email warranty crowcon com 52 Issue 7 CROUVCOM yun pue eyds p wo syne sip lo s ney seal juauno doo yuloz r JO uomge4qi e2 Vuloz eye1qie2 vulp nu uu ulew OL nueuiqns yw le1qileS ndino yw dwe jenuejy ynd no yw dwey juauno jndjno o jueuunijsui S994104 q uul swa nu ul J9ujo Aejdsip o Aay NMOGd sn owy pou iiqiqur ejejsi nuaw Kejdsip se o1 lt v JO Saul ow SMOUS Elds q Jequinu jenas shejdsiq Jequunu ees Jequinu eres uOISJ9A M S SjInej 1e9 2 Vui ayeuques jindjno vui dwey seb 56 0z ZO 189 lt seb e9 0197 pouu
38. nk loop powered device designed to work in safe and hazardous zones 0 1 and 2 areas when used in conjunction with an appropriate barrier Figures 2 3 2 4 and 2 5 summarise the electrical connections SAFE AREA Figure 2 3 Electrical connections for safe area HAZARDOUS AREA Note An IS earth connection must be supplied in the safe area so as to avoid earth loops and to maintain IS certification CONTROL PANEL f i o U teo HE Figure 2 4 Electrical connections using Zener barrier Control Panel Control Panel P CROWCON ZENER BARRIERS SAFE AREA HAZARDOUS AREA Sensor 8 Pepperl Fuchs 1 7 2715 2728 2 _ Cm 15 Earth Sensor 1 MTL 3 I F 715 728 4 15 Earth Issue 7 11 TXgard IS Installation Figure 2 5 Electrical connections using galvanic isolator GALVANIC ISOLATORS SAFE AREA HAZARDOUS AREA Control Panel A um ii e n 8 pperl Fuchs 7 KFD2 CR Ex1 30200 V 1211 Earth 24v DC Supply 7 1 Sensor ane A A Pi MTL it 12 2 M U BEC F 13114 24v DC Supply 12 Issue 7 ccROWCON Operation TXgard IS 3 OPERATION 3
39. ocation with the detector pointing down This ensures that dust or water will not collect on the sensor and stop gas entering the detector Figure 2 1 TXgard IS dimmensions M6 or M inch CROVVCON 5 ppm co Cabling requirement Cabling to TXgard IS must be in accordance with the recognised standards of the appropriate authority in the country concerned and must also meet the electrical requirements of the detector Crowcon recommends the use of 2 core twisted pair cable but there is no particular restriction as long as it can supply 8 V at 20 mA to the instrument terminals Suitable weatherproof glands must be used Cable should be identified as being intrinsically safe by some means for example by having a blue outer sheath Alternative cabling techniques such as steel conduit may be acceptable provided that appropriate standards are met TXgard IS requires a dc supply of 8 32 V and is loop powered If mounting in a hazardous area do not use a higher voltage than the Zener barrier s rating usually 28 V Ensure there is a minimum supply of 8 V at the detector taking into account the voltage drop due to cable resistance and the sense resistance of the control panel to which it is connected Table 2 1 on page 10 shows maximum cable distances given typical cable parameters See appendix F for more inform
40. on page 15 gt To gas display Inhibit mode 4 4 Move the cursor down and select the Zero Cal gas menu item The submenu list for zeroing and calibrating the gas appears 5 Select the Zero gas menu item The instrument will display a scrolling text message Ensure the instrument is in clean air and the sensor has settled CROUVCON Issue 7 17 TXgard IS Commissioning 6 Press the button to start zeroing the detector The instrument will display the following message Zeroing Sensor When complete the instrument will report a scrolling text message Zero operation successful 7 Press the o button to continue the display will return to the Zero cal submenu gt To main menu Zero gas V 8 You may now proceed to calibrate the gas on the detector Step 4 Calibrate gas on the detector Before commencing calibrating gas on the detector ensure you have sample gas For Oxygen sensors go to section 4 2 NOTE Whilst in calibrate mode the instrument outputs the Inhibit current If you have just completed step 3 Zeroing you will still be in the Zero Cal Gas submenu and can skip to 5 1 Enter the menu system by pressing the o button 2 Atthe password prompt enter the password by default this is the down button 5 times 18 Issue 7 CROUVCOM Commissioning TXgard IS 3 You should now be in the main menu gt To gas display Inhibit mode V
41. ovided to select the menu options and respond to instrument messages the o UP and o DOWN button moves your selection through the menu list a cursor gt indicates current selection To enter that selection press the e ENTER key To enter the menu system 1 Press the button and then the default password which is the down button five times 2 Press the o button again to exit the menu system if you decide not to change the instruments settings The operator display panel shows the available menus The TXgard IS has seven standard menus that allow you to calibrate and configure the instrument The menu structure for a TXgard IS Toxic detector is shown in Figure 3 4 on page 14 detailed menus can be found in Appendix D NOTE the menu for the oxygen detector only varies for the Zero cal gas menu item which is replaced by Cal O2 20 9 To exit the main menu display 1 Toexit any menu use the o key to move the cursor to the top of the menu list where you will find To gas display If you are in a submenu you will need to repeat this and move the cursor to the top of the menu list to return to the gas display Note UP OUT To go directly to the bottom of a menu press simultaneously To go directly to the top of a menu press o and simultaneously The menu will also return to the gas display after a timeout default 5 minutes 14 Issue 7 CROUVCOM Operation TXgard I
42. rogen sulphide mount the detector at normal breathing height When locating detectors consider the possible damage caused by natural events such as rain or flooding For detectors mounted outdoors Crowcon recommends the use of a spray deflector part no C01338 Mounting of oxygen detectors requires knowledge of the gas displacing the oxygen For example carbon dioxide is heavier than air and displaces oxygen at low level Under these circumstances oxygen detectors should be placed at low level Consider ease of access for functional testing and servicing Consider how the escaping gas may behave due to natural or forced air currents Mount detectors in ventilation ducts if appropriate Consider the process conditions Gases that are normally heavier than air but are released from a process line that is at a high temperature and or under pressure may rise rather than fall Ammonia released from a cooling system may fall rather than rise The placement of the sensors should be decided following the advice of experts with specialist knowledge of gas dispersion experts with knowledge of the process plant system and equipment involved and safety and engineering personnel The agreement reached on the locations of sensors should be recorded Crowcon is pleased to assist in the selection and siting of gas detectors Issue 7 CROUVCOM Installation TXgard IS 2 2 2 3 Mounting TXgard IS should be installed at the l
43. s Contact Crowcon Bayonet sensor housing 3 wire S01343 Bayonet sensor housing 2 vvire oxygen S012027 sensor 37 Issue 7 5 CROUVCON Appendix D TXgard IS APPENDIX D MENU SYSTEM This section provides greater details for the TXgard IS menu items and is a supplement to the section Using the TXgard IS menus on page 14 You may wish to refer to the Menu Map on the back cover to familiarise yourself with the menu hierarchy This appendix also works in conjunction with the Fault Finding guide on page 26 To enter the TXgard IS Menu System Press the button and then the default password which is the down button five times To select a menu item use the UP and DOWN buttons to move the cursor gt to the desired menu item and press the button Inhibit mode Description Forces instrument to output the Inhibit current This menu option provides a convenient option to allow an engineer to force the instrument to output the Inhibit current whilst he carries out maintenance on the TXgard IS This will prevent unwanted alarms being seen at the control panel whilst for example the sensor is changed It provides an alternative to setting the instrument into Calibrate mode which also outputs the Inhibit current Instructions 1 Enter the TXgard IS menu system by pressing the o key followed by the down key five times 2 Move the cursor down and select the Inhibit mode menu item By selecting Enable
44. s detection equipment EN50271 software design standard UL UL913 Ed 7 cUL CSAC22 2 No 157 class 1 group A B C and D This device complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation This Class A digital apparatus complies with Canadian ICES 003 Cet appareil num rique de la classe A est conforme a la norme NMB 003 du Canada Zones ATEX IECEx 0 1 amp 2 UL Class 1 Gas groups ATEX IECEx IIC UL A B C amp D Zener barriers or Max 28 V 93 mA 0 66 Watts galvanic isolators Specifications are typical and may vary for different sensor types CROUVCON Issue 7 36 TXgard IS Appendix C APPENDIX C SPARE PARTS AND ACCESSORIES Please contact Crowcon for details of the latest replacement sensors Please quote the part number given on the Sensor Replacement label mounted on the outside of the sensor housing Description M20 to 72 NPTF adaptor M20 to 34 NPTF adaptor Ceiling mounting bracket Collector cone Spray deflector 728 Zener barrier for use with 24 V dc C03221 systems 5041 Galvanic isolator Mounting box for 2 Zener barriers Mounting box for 5 Zener barriers Mounting box for 12 Zener barriers Mounting box for 4 galvanic isolators Mounting box for 8 galvanic isolators Calibration ga
45. s from the detector and exit the menu system The instrument is now calibrated If the control equipment display requires adjustment consult the operating manual for the control display equipment 20 Issue 7 cROWCON Commissioning TXgard IS Table 4 1 Typical gas ranges Gas Code Gas Unit Standard Rangest O2 Oxygen vol 0 25 CO Carbon monoxide ppm 0 250 H2S Hydrogen sulphide ppm 0 25 SO2 Sulphur dioxide ppm 0 10 and 0 100 CL2 Chlorine ppm 0 5 Note other ranges are available on request 4 2 Commissioning procedure Oxygen detector Step 1 Connecting the detector to the control panel 1 Apply power to the detector via 2 way connector J4 Figure 1 1 on page 6 The instrument requires a minimum of 8 V dc at connector J4 at 20 mA As long as the instrument is running you can see the supply voltage on the LCD by pushing the o button 2 Leave the detector to stabilise for at least 2 hours Step 2 Checking the 4 20 mA loop current This step can be omitted as the TXgard IS is delivered pre calibrated hovvever if you vvish to check the 4 20 mA loop current then it can be checked as outlined belovv Alternately the TXgard IS provides a facility to force a known current through the loop Refer to the Ramp mA menu item in Appendix D for instructions 5 CROUVCON Issue 7 21 TXgard IS Commissioning NOTE there is no need to disconnect a sensor whe
46. ta for the associated sensor When replacing a sensor it is not necessary to change the Personality Module you simply rezero Note not necessary for O2 sensor and recalibrate and the Personality Module stores the new calibration constants When the detector is powered through a suitable Zener barrier or galvanic isolator the system is certified Ex ia IIC T4 Figure 1 1 TXgard IS fitted with toxic sensor 40 200mV 2 CD TEST POINTS M20 CABLE ENTRY CONNECTION TO CONTROL PANEL Some baseboards may have J4 in this orientation ey PERSONALITY MODULE N SENSOR S HOUSING Important TXgard IS is designed for use in Zone 0 1 or 2 or Division 1 Division 2 hazardous areas and is certified Ex ia IIC T4 when used with a suitable Zener barrier or galvanic isolator Installation must be in accordance with the recognised standards of the appropriate authority in the country concerned TXgard IS should be inspected regularly if used in a dusty environment For further information please contact Crowcon Before carrying out any installation work ensure that local regulations and site procedures are followed 6 Issue 7 CROUVCOM Introduction TXgard IS Storage Instructions The sensor used in this detector has a maximum non powered storage life of 3 months Sensors stored within a detector for longer than 3 months prior to commissioning may not last for the full expected operational l
47. ui uleul oL Seb jeg 0492 seb SeD 2 seb os z nueuiqng J0329jep 91X0 S pJeDx 40 lm ns nue N pe eJn614 P CROWCON Issue 7 15 TXgard IS Commissioning 4 COMMISSIONING The commissioning procedures for toxic detectors can be found in section 4 1 To commission oxygen detectors go to section 4 2 Warning 4 1 Before carrying out any work ensure that local regulations and site procedures are followed Ensure that the associated control panel is inhibited to prevent false alarms Commissioning procedure Toxic gas detectors NOTE To prevent false alarms during calibration enable inhibit mode prior to zeroing or applying gas see Figure 3 4 The detector output will then remain at the preset inhibit level see Appendix D for five minutes or until inhibit mode is cleared manually Inhibit will appear on the normal operating display when inhibit is active and the detector will automatically resume gas level output after five minutes Step 1 Connecting the detector to the control panel 1 Apply power to the detector via 2 way connector J4 Figure 1 1 on page 6 The instrument requires a minimum of 8 V dc at connector J4 at 20 mA As long as the instrument is running you can see the supply voltage on the display panel by pushing the o button 2 Leave the detector to stabilise for at least 2 hours NOTE the detector is factory pre set to automatically
48. uoneJqieo ay ejejduio epouJ ejeJqi eo ui si jueuunJjsu 1 1411 ue sindino jueunasu q xipueddy ees nu u uoneinBijuoo y Ul seo JO Wu yz v Z O 198s equeo slu uno Yiqiuuinin ed eui JoN MoJeq pequosep se uoroe aye pue ne o ejdsip euiuex3 jeuBbis 3jne 4 e sindino jueuunujsu U9Z0JJ s eUBIS WW Qz v Alddns 49949 8 0 S8JIM U punoJ Aem BuoJA y ase peep Buiddems Aq Ajuejod y SH A H y l ou Ajjensn si esneo sjeedde jueuungsur pe ejdsip si Bu u oN Bess ui 10448 uuo jduu S ejep dnyoeq Buisn Aq 1940991 nunuo ueo jnq uejqoJud e peonou sey jueuinujsur eu jeu sBuiuJew jdwis eJe 5 eje 4 UON 71 BunoeuuoooJ pue Jewod umowa Aq paseaj eq seuuneuJos ueo nq pasna eq jouueo 566 y ey unoue H A S 5 e3e4 ONIGNISA LINVA 9 Fault finding 26 Issue 7 CROWCON Fault finding TXgard IS 1osu s seb Jo speolugAo uBiu 10 Je u amp e snqe snoues s uinb iu Ajjewsou siu nq Zy idulo lp sJosues Ajeuoise29 o Buioe d i peeu Keuj Ajjenjue e pue s eoep jndjno 1194 uun Ji u e BABY SIOSUBS nuluu s nil 0 S 0 199109 y 16 10sues BU o p lidde SI pue uonegueouoo ejeudoudde ue je SI SE uoneJqi eo au y

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