Crowcon TXgard-IS+ Installation, Operation And Maintenance Instructions Download Page 1

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Installation, Operation and Maintenance Instructions

M07214

Issue 8

January 2015

TXgard-IS+

Intrinsically Safe
Toxic and Oxygen Gas Detectors

www.acornfiresecurity.com

Summary of Contents for TXgard-IS+

Page 1: ...Installation Operation and Maintenance Instructions M07214 Issue 8 January 2015 TXgard IS Intrinsically Safe Toxic and Oxygen Gas Detectors www acornfiresecurity com www acornfiresecurity com...

Page 2: ...www acornfiresecurity com www acornfiresecurity com...

Page 3: ...TXgard IS menus 11 4 COMMISSIONING 14 Commissioning procedure 14 Commissioning procedure 20 5 MAINTENANCE 23 Routine maintenance 23 Sensor replacement and servicing of detectors 23 6 FAULT FINDING 25...

Page 4: ...APPENDIX D 38 MENU SYSTEM 38 APPENDIX E 48 4 20 mA LOOPS 48 APPENDIX F 50 CABLING REQUIREMENT 50 APPENDIX G 53 SENSOR LIMITATIONS 53 www acornfiresecurity com www acornfiresecurity com...

Page 5: ...st two wires so only one barrier is required The instruments are supplied with the mA pre calibrated so the mA does not need re calibration in the field The keypad and operator display panel allow acc...

Page 6: ...he Personality Module contains a memory chip with calibration data for the associated sensor When replacing a sensor it is not necessary to change the Personality Module you simply rezero Note not nec...

Page 7: ...y installation work ensure that local regulations and site procedures are followed Storage Instructions The sensor used in this detector has a maximum non powered storage life of 3 months Sensors stor...

Page 8: ...8 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 det...

Page 9: ...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 detecto...

Page 10: ...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 d...

Page 11: ...20 mA sink 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 4 5 and 6 summarise the electrical connections...

Page 12: ...S AREA Note An IS earth connection must be supplied in the safe area so as to avoid earth loops and to maintain IS certification Figure 5 Electrical connections using Zener barrier www acornfiresecuri...

Page 13: ...TXgard IS Installation 9 Figure 6 Electrical connections using galvanic isolator www acornfiresecurity com www acornfiresecurity com...

Page 14: ...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 curr...

Page 15: ...ges the UP and DOWN button moves your selection through the menu list a cursor indicates current selection To enter that selection press the ENTER key To enter the menu system 1 Press the button and t...

Page 16: ...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 dis...

Page 17: ...TXgard IS Operation 13 Figure 10 Menu structure for TXgard IS toxic detector See Appendix D and Section 4 2 for further information www acornfiresecurity com www acornfiresecurity com...

Page 18: ...ndix 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...

Page 19: ...t points TP1 and TP2 on the baseboard Figure 1 on page 2 or Figure 3 on page 7 The loop current flows through a sense resistor between these test points so a 4 mA loop current will show as 40 mV on th...

Page 20: ...on to start zeroing the detector The instrument will display the following message When complete the instrument will report a scrolling text message Zero operation successful 7 Press the button to con...

Page 21: ...splay Inhibit mode 4 Select the 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 sc...

Page 22: ...s value is usually measured in ppm or as vol ppb and LEL are also available as appropriate 8 Select the button to set the calibration value The instrument will display the following Tip See Table 2 on...

Page 23: ...now calibrated If the control equipment display requires adjustment consult the operating manual for the control display equipment Table 2 Typical gas ranges Gas Code Gas Unit Standard Ranges O2 Oxyge...

Page 24: ...ernately 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 cal...

Page 25: ...splay Inhibit mode 4 Move cursor down and select the Cal O2 20 9 gas menu The submenu list for calibrating oxygen appears 5 Select the Confirm O2 cal menu item The instrument will display a scrolling...

Page 26: ...the button to continue and exit the menu system The instrument is now calibrated If the control equipment display requires adjustment consult the operating manual for the equipment www acornfiresecur...

Page 27: ...e 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...

Page 28: ...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 corre...

Page 29: ...0 mA signal is frozen Instrument outputs a Fault signal Examine display to determine fault and take action as described below Note the Fault inhibit currents can be set to 2 3 4 24 mA or Gas Level in...

Page 30: ...nsor is in clean air and has settled Cal warning The last calibration operation did not complete successfully there would also have been a scrolling message on completion of the calibrate stating that...

Page 31: ...ure sensor has been properly zeroed before calibrating Gas calib err Fatal Gas calibration data stored in the sensor module s non volatile memory has been corrupted Sensor must be re zeroed and calibr...

Page 32: ...RAM2 fault mA low error The instrument is recalibrating its 4 20 mA signal because it has detected a discrepancy between what it should be and what it is This could be a result of earth loop currents...

Page 33: ...replaced confirm that a new one has been placed correctly in the sensor housing mA is unexpectedly low for gas reading The instrument gas calibration is not set to the correct scale for example expect...

Page 34: ...g Check and reconfigure contrast setting in Configuration menu Display blank cannot be read at any angle Faulty circuit LCD or extremely poor contrast setting Send to Crowcon for reconfiguration Error...

Page 35: ...e TXgard IS to a Crowcon Vortex The TXgard IS is connected to the Vortex control panel using a Quad Channel Module see Figure 11 The module consists of four channels each with a 3 way connector The de...

Page 36: ...tor racking system The links for Toxic and Oxygen detectors are the same configure the INPUT card as follows LINK Make these connections LK1 A C LK2 E I K LK3 none LK4 4 20 LK5 24V LK6 C C LK7 24V At...

Page 37: ...ault signal is set to minimum 2 2 mA 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Channel 0V 24V 60 DETECTOR HEADS 63 66 61 62 64 65 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 9...

Page 38: ...asflag 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 LK1...

Page 39: ...o 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 abo...

Page 40: ...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 inc...

Page 41: ...he outside of the sensor housing Contact Crowcon for part numbers for suitable Zener Barriers or Galvanic Isolators Description Part Number M20 to NPTF adaptor M02125 M20 to NPTF adaptor M02281 Collec...

Page 42: ...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 a...

Page 43: ...e 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...

Page 44: ...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 When would I use it Ramp mA output can be used to help calib...

Page 45: ...8 V at the instrument terminals for the instrument to function 3 Use the UP and DOWN keys to adjust the loop current value The current value will increment in 0 5 mA steps The default value of the lo...

Page 46: ...n menu Limit 4 20 mA Enable Disable If enabled the instrument will only ever draw a maximum of 20 mA no matter what the gas value Set inhibit mA Minimum 3 mA Clean Air mA or Gas Level When the instrum...

Page 47: ...educe the amount of noise will be at the expense of sensor response time Menu timeout 30 secs 1 5 or 10 minutes No timeout This sets the timeout value before a menu display will automatically return t...

Page 48: ...s Level 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 purpos...

Page 49: ...the Set Inhibit mA menu Help screen Enable disable If further help is enabled the menu will display more detailed help messages The user will be presented with For error help press else RETURN if a wa...

Page 50: ...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...

Page 51: ...oblem 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 pre...

Page 52: ...rument 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 c...

Page 53: ...se the instrument is powered by one pair of wires supply and 0 V and the current signal is measured between the third wire and 0V Because 3 wire circuits don t depend on the current in the signal loop...

Page 54: ...aking 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 gu...

Page 55: ...of cable Example Control panel Zener barrier 1 km of 1 mm cable 2 TXgard IS Nominal 24 V supply guaranteed 22 V output 250 ohm current sense resistor 300 ohm resistance max permissible load 3 05 mH 0...

Page 56: ...ed but most control panels use 3 mA or less to signal faults mm2 Note 2 It is worth noting that most 28 V Zener barriers are 300 which will give another 6 V drop With an 18 V supply and a 250 sense re...

Page 57: ...ater 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 t...

Page 58: ...Appendix G TXgard IS 54 www acornfiresecurity com www acornfiresecurity com...

Page 59: ...55 www acornfiresecurity com www acornfiresecurity com...

Page 60: ...www acornfiresecurity com www acornfiresecurity com...

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