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Model CXT-IR

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1. Figure 13 Terminal Interconnect for Smart Battery Pack A 6 32 or 8 32 threaded exterior ground point is provided on most junction boxes for an NOTE external ground If the Sensor Assembly is not mechanically grounded an external ground strap must be used to ensure that the sensor is electrically grounded 2 6 Initial Start Up 2 6 1 Combustible Gas Sensors Upon completion of all mechanical mounting and installation of the batteries power is now applied to the unit If the unit is equipped with the optional power switch power is applied by pushing the switch Observe the following normal conditions 1 Upon power up the sensor will scroll CXT IR and will then display the current reading for approximately 5 seconds A temporary upscale reading may occur as the sensor stabilizes This upscale reading will decrease to 0 LEL within 1 to 2 minutes of power up assuming there is no gas in the area of the sensor 2 After the initial power up the sensor display will turn off Thereafter the display will come on once every 10 seconds and will display the current reading for about 2 seconds and will return to a blank display to conserve battery power In normal operation the display will come on once every 10 seconds will display the NOTE current reading for about 2 seconds and will return to a blank display to conserve battery power Model CXT IR Instruction Manual Rev 1 4 Page 15 of 46 Ll B d
2. eseeeeseeeeeeeneee nennen eene eene treten trennen trennen 30 4 2 1 CXT Sensor Reglsters 52 netu n ee teo estis Pg Tg ete eae OR LE RS 32 4 2 2 CXT Iransceiver Register rai 32 5 Service and Maintenance A UE GeV IESU QU CENA RENE I S URS ida 34 5 1 Calibration Frequency ete EUR a it piece oe eq RES 34 5 2 Visual Inspection cion asii 35 5 3 Condensation Prevention Packet isisisi neneton in ire oro eene nennen neon neon conocio nn non nono nete eene 35 5 4 Replacement of the Batteries Battery Pack nene enne nnne 35 5 4 1 Low Battery Fault Indication eee e eee eese eee entente ERE E E EEE 35 5 4 2 Units with 12V Smart Battery Paik suen enera ieee ie entente eene tenen nnne enne nc innen en 35 5 4 3 Units with Tri C sized Lithium Battery Holder eese eee 35 5 5 Replacement of Plug in Sensor eee ospite I EEE SS rn Rte HERE Dre pee REP DRE 36 5 6 Replacement of ITM Aluminum Junction Box eene enne trennen 37 5 7 Replacement of ITM Stainless Steel Mini Condulet sess 37 6 Troubleshooting Gil tinto 38 6 1 Missing Sensor Cell Palta sien s 39 6 2 Sensor Fall cir lotus nU aieo n Dp Ren nee RD GIN UD UR RUIN Oe 39 6 3 Under Range problems iii 39 6 4 Stabilit problems 2th ais 39 6 5 Cleanng problem s SERO Ine D iE bino Uber tria tuti n ts aaa hemes 40 6 6 Poor Cahbration Repeatability o in US tie iie a e RU nU OR 40 6 7 Unstable Qutput sudden spiking o ED eer ue on
3. Bump Test Restore Defaults Set RF Channel Set Modbus M ID 3 4 4 Navigating Program Mode From normal operation enter program mode by holding the magnet over PGM2 for 10 seconds The arrow prompt lt 4 and gt will show that the magnetic switch is activated during the 10 NOTE second hold period The ITM will enter program mode and the display will scroll the first menu item View Sensor Status To advance to the next menu item hold the magnet over PGM1 or PGM2 while the current menu item text is scrolling At the conclusion of the text scroll the arrow prompt for PGM2 or PGM1 will appear and immediately remove the magnet The ITM will advance to the next menu item Repeat this process until the desired menu item is displayed NOTE PGM1 moves the menu items from right to left and PGM2 moves the menu items from left to right To enter a menu item hold the magnet over PGM1 or PGM2 while the menu item is scrolling At the conclusion of the text scroll the arrow prompt for PGM2 or PGM1 will appear continue to hold the magnet over PGM1 or PGM2 for an additional 3 to 4 seconds to enter the selected menu item If there is no magnet activity while the menu item text is scrolling typically 4 repeated text scrolls the ITM will automatically revert to normal operation Model CXT IR Instruction Manual Rev 1 4 Page 23 of 46 Ll B detcon inc Model CXT IR 3 5 View Sensor Status View Sensor Status displays all current configurat
4. detcon inc Model CXT IR Modbus transactions consist of both a request by the controller and response from the device being addressed so there are two frames transferred for every transaction Every request is evaluated by the CXT to determine if it is addressed to it and if it falls within the register address range If these two conditions are true the CXT will then check to see if it is a valid Function Code Function Codes supported by the CXT are e Function Code 03 03h Read Holding Registers e Function Code 06 06h Write Single Register e Function Code 16 10h Write Multiple Registers If an invalid function code is performed the CXT will ignore the request by default and the controller will timeout and continue with the next transaction 4 1 1 Modbus M Requests The CXT is capable of returning Modbus exceptions when it cannot service a Modbus request meant for that CXT By default this is turned off since it can cause issues with some controllers that do not process Modbus exceptions Section 4 2 2 4 Register Control The following exception codes are supported and returned when Modbus exceptions are enabled Table 2 Exception Codes Exception 7 Code Name Meaning 01 Illegal Function Unsupported function code Only 03 06 and 16 are supported Invalid register address detected If any request for registers outside of the 02 Illegal Data Address valid register address for the CXT occurs this e
5. 0 It represents the translation between the target gas and the cal gas when they are different The menu item appears as Set Gas Factor To calculate the correct Gas Factor Table 1 take the Gas Factor of the target gas and divide by the Gas Factor of the cal gas The calculated value is the correct number to enter into the menu as the Gas Factor For example if calibrating with methane when propane is the target gas the correct Gas Factor to enter would be 0 63 1 0 0 63 Model CXT IR Instruction Manual Rev 1 4 Page 25 of 46 a zone Model CXT IR For example if calibrating with butane when ethane is the target gas the correct Gas Factor to enter would be 0 38 0 72 0 53 Table 1 shows the Gas Factors of most combustible hydrocarbon gases that will be measured Find the gas of interest for the cal gas and the target gas and follow the above instruction If there is a mixture of target gases use a weighted approach to determine the correct Gas Factor For example if the target gas was 50 butane and 50 pentane and the cal gas was methane the correct Gas Factor would be calculated and entered as 0 5 x 0 77 0 5 x 0 77 1 0 0 77 Table 1 Gas Factors Gas Factor Gas Factor Gas Factor Acetic Acid 2 00 Decane 1 53 Naphthalene Acetone 1 21 Ethyl Alcohol 0 35 n Nonane 1 53 Benzene 1 00 Ethane 0 38 n Octane 1 34 1 3 Butadiene 1 80 Ethyl Benzene 1 07 n Pentane 0 77 Butane
6. 0 77 Ethylene 2 39 Propane 0 63 Iso Butane 0 72 n Heptane 0 98 iso Propyl Alcohol 0 54 Butene 1 0 67 n Hexane 1 00 Propylene 0 80 n Butyl Alcohol 0 63 Dimethyl Ether 0 40 Toluene 1 00 iso Butyl Alcohol 0 63 Methane 1 00 Vinyl Acetate 1 43 Cyclohexane 0 89 Methanol 0 41 Vinyl Chloride Cyclopropane 0 45 Methyl Ethyl Ketone 0 77 Xylene 1 00 From the Set Gas Factor text scroll hold the magnet over PGM1 or PGM2 until the arrow prompt appears and continue to hold the magnet in place for an additional 3 to 4 seconds until the display starts to scroll Set Factor The display will then switch to X XX where X XX is the current gas factor Swipe the magnet momentarily over PGM2 to increase or PGM1 to decrease the gas factor level until the correct value is displayed Hold the magnet over PGM2 for 3 seconds to accept the new value The display will scroll Factor Saved and revert to Set Gas Factor text scroll Move to another menu item by executing a momentary hold or return to normal operation via automatic timeout of about 15 seconds the display will scroll Set Gas Factor four times and then return to normal operation 3 9 Bump Test Bump Test is used to check the response of the sensor with the indication of response limited to the display only The results of the bump test will not affect the reading register on the Modbus output The menu item appears as Bump Test From the Bump Test text scroll hold the magnet over PGM1 or PGM2 until
7. LEL or PPM H2S If the sensor is actively experiencing any diagnostic faults a swipe of the magnet will cause the display to scroll the fault condition Refer to Section 3 12for more information on fault conditions 3 3 Calibration Mode Zero and span calibration should be performed on a routine basis quarterly minimum is advised to ensure reliable performance If a sensor has been exposed to any de sensitizing gases or to very high over range combustible gas levels re calibration should be considered Unless otherwise specified span adjustment is recommended at 50 of the full scale range To enter Calibration Mode hold the magnet over PGM1 for 3 seconds If the sensor is experiencing a fault condition the lt 4 prompt will not appear until the fault s have been displayed When the ITM enters Calibration Mode the display will scroll Pgm1 Zero Pgm2 Span twice before returning to Normal Mode about 5 seconds 3 3 1 AutoZero The AutoZero function is used to zero the sensor AutoZero should be performed periodically or as required AutoZero should be considered after periods of over range target gas exposure Local ambient air can be used to zero calibrate a combustible gas sensor as long as it can be confirmed that it contains no target or interference gasses If this cannot be confirmed then a zero air or N cylinder should be used Material Requirements e DetconMicroSafe Programming Magnet PN 327 000000 000 e Detcon Spla
8. Sensor Technology The sensor technology is designed as a miniature plug in replaceable component which can easily be changed out in the field The NDIR sensor consists of Figure 1 e one infrared lamp source e two pyroelectric detectors active and reference e and one optical gas sample chamber The lamp source produces infrared radiation which interacts with the target gas as it is reflected through the optical gas sample chamber The infrared radiation contacts each of the two pyroelectric detectors at the completion of the optical path The active pyroelectric detector is covered by a filter specific to the part of the IR spectrum where the target gas absorbs light The reference pyroelectric detector is covered by a filter specific to the non absorbing part of the IR spectrum When the target gas is present it absorbs IR radiation and the signal output from the active detective decreases accordingly The reference detector output remains unchanged The ratio of the active and reference detector outputs are then used to compute the target gas concentration The technique is referred to as non selective and may be used to monitor most any combustible hydrocarbon gas Unlike catalytic bead type sensors Detcon IR sensors are completely resistant to poisoning from corrosive gases and can operate in the absence of an oxygen background The sensors are characteristically stable and capable of providing reliable performance for periods exceed
9. continue to hold the magnet in place for an additional 3 to 4 seconds until the display starts to scroll LEL VOL Swipe the magnet momentarily over PGM2 or PGM1 to change the selection until the correct choice is displayed Hold the magnet over PGM1 or PGM2 for 3 seconds to Model CXT IR Instruction Manual Rev 1 4 Page 24 of 46 fJ e detcon inc Model CXT IR accept the new value The display will scroll Type Saved then Set Range followed by the currently selected Range Momentarily hold the magnet over PGM1 or PGM2 to change the Range Selection until the correct value is displayed Hold the magnet over PGM2 for 3 seconds to accept the new value Move to another menu item by executing a momentary hold or return to normal operation via automatic timeout of about 15 seconds the display will scroll Set Gas Type 4 times and then return to normal operation 3 7 Set AutoSpan Level Set AutoSpan Level is used to set the span gas concentration level that is being used to calibrate the sensor This level is adjustable from 5 to 95 of range The current setting can be viewed in View Program Status The menu item appears as Set AutoSpan Level From the Set AutoSpan Level text scroll hold the magnet over PGM1 or PGM2 until the arrow prompt appears and continue to hold the magnet in place for an additional 3 4 seconds until the display starts to scroll Set Level The display will switch to XX where XX is the current gas level Swipe the
10. selection of sensor locations e Density of the gas to be detected e Most probable leak sources within the industrial process e Ventilation or prevailing wind conditions e Personnel exposure e Placement of transmitting antenna e Maintenance access 2 21 Density Placement of sensors relative to the density of the target gas should be located within 4 feet of grade as heavy gases tend to settle in low lying areas For gases lighter than air sensor placement should be 4 to 8 feet above grade in open areas or in pitched areas of enclosed spaces Model CXT IR Instruction Manual Rev 1 4 Page 9 of 46 Ll B detcon inc Model CXT IR 2 2 2 Leak Sources The most probable leak sources within an industrial process include flanges valves and tubing connections of the sealed type where seals may either fail or wear Other leak sources are best determined by facility engineers with experience in similar processes 2 2 3 Ventilation Normal ventilation or prevailing wind conditions can dictate efficient location of gas sensors in a manner where the migration of gas clouds is quickly detected 2 2 4 Personnel Exposure The undetected migration of gas clouds should not be allowed to approach concentrated personnel areas such as control rooms maintenance or warehouse buildings A more general and applicable sensor location is combining leak source and perimeter protection in the best possible configuration 2 2 5 Maintenance Access Consid
11. the arrow prompt appears and continue to hold the magnet in place for an additional 3 to 4 seconds until the display starts to scroll Bump Test Started The display will return to normal operation alternating between the live gas reading and showing Bump until 2 minutes expires or the execution of a momentary hold over PGM1 or PGM2 when the display will scroll Bump Test Ended Model CXT IR Instruction Manual Rev 1 4 Page 26 of 46 detcon inc Model CXT IR 3 10 Restore Defaults The CXT IR sensor has the option to restore its internal memory settings to factory default conditions The menu item appears as Restore Defaults From the Restore Defaults text scroll hold the magnet over PGM2 until the arrow prompt appears and continue to hold the magnet in place for an additional 3 to 4 seconds until the display starts to scroll Defaults Restored The display will then revert to Restore Defaults text scroll Move to another menu item by executing a momentary hold or return to normal operation via automatic timeout of about 15 seconds the display will scroll Restore Defaults four times and then return to normal operation Ab After the defaults are restored the sensor must be recalibrated CAUTION 3 11 Set RF Channel The CXT IR sensor communicates wirelessly and can be set to use unique wireless radio channel Set RF Channel is used to set the RF radio channel It is adjustable from 0 to 15 The menu item appears as Set RF Chan
12. this warranty is limited to the cost of the equipment supplied by Detcon Inc The customer will assume all liability for the misuse of this equipment by its employees or other contracted personnel All warranties are contingent upon the proper use in the application for which the product was intended and does not cover products which have been modified or repaired without Detcon Inc approval or which have been subjected to neglect accident improper installation or application or on which the original identification marks have been removed or altered Except for the express warranty stated above Detcon Inc disclaims all warranties with regard to the products sold Including all implied warranties of merchantability and fitness and the express warranties stated herein are in lieu of all obligations or liabilities on the part of Detcon Inc for damages including but not limited to consequential damages arising out of or in connection with the performance of the product Model CXT IR Instruction Manual Rev 1 4 Page 43 of 46 Ll B detcon inc Model CXT IR 7 2 CXT IR Sensor Warranty Detcon Inc as the manufacturer warrants under intended normal use each new CXT IR sensor to be free from defects in material and workmanship for a period of one year from the date of shipment to the original purchaser Should the sensor fail to perform in accordance with published specifications within the warranty period return to Detcon Inc for necessa
13. will display the fault If the sensor is experiencing a fault condition a momentary swipe of the magnet will cause the ITM to scroll the fault condition s across the display before the or gt prompt will appear The Display Error Codes are Auto Span Fault Temperature Fault Memory Fault Processor Fault Clearing Fault Model CXT IR Instruction Manual Rev 1 4 Page 38 of 46 fJ a detcon inc Model CXT IR Range Fault Missing Sensor Cell Fault Sensor Fault Zero Fault Low Battery Fault Some faults are self explanatory and if these faults occur and cannot be cleared the ITM should be replaced first to see if the fault will clear Other faults may need further investigation Some of the sensor problems associated error codes and resolutions are listed below 6 1 Missing Sensor Cell Fault Probable Cause The sensor cell is not installed is installed incorrectly or is non operational e Replace the Sensor Cell with a known good Sensor Cell 6 2 Sensor Fault Probable Cause The sensor optics have become too dirty to support functionality e Replace the Sensor Cell with a known good Sensor Cell 6 3 Under Range problems Probable Cause Sensor baseline drifted lower interference gases e Perform zero calibration e Use zero air or N source Section3 3 1AutoZero e Allow more time for zero stabilization if this is a biased sensor type e Execute successful span calibration Section 3 3 2AutoSpan e Replace plug in co
14. 0cc min being the NOTE recommended flow rate Other concentrations can be used if they fall within allowable levels of 5 to 100 of range NOTE It is generally not advised to use other gasses to cross calibrate for span Cross calibration by use of other gasses should be confirmed by Detcon concentration is required before executing AutoSpan calibration These two D Verification that the calibration gas level setting matches the calibration span gas CAUTION _ numbers must be equal Model CXT IR Instruction Manual Rev 1 4 Page 21 of 46 Ll B detcon inc Model CXT IR AutoSpan consists of entering calibration mode and following the menu displayed instructions The display will ask for the application of span gas in a specific concentration The applied gas concentration must be equal to the calibration gas level setting The factory default setting and recommendation for span gas concentration is 50 of range If a span gas containing the recommended concentration is not available other concentrations may be used as long as they fall between 5 and 95 of range However any alternate span gas concentration value must be programmed via the Set AutoSpan Level menu before proceeding with AutoSpan calibration Follow the instructions a through f below for AutoSpan calibration a Verify that the AutoSpan level is equal to the calibration span gas concentration Refer to View Sensor Status in Section 3 5 If the AutoSpan level is not equal
15. 1 are TRUE Status Bits High Byte Bit 15 Reserved Bit 14 Calibration Mode Bit 13 Reserved Bit 12 Zero Fault Bit11 Range Fault Bit 10 Reserved Bit9 Clearing Fault Bit8 Reserved Status Bits Low Byte Bit 7 Sensor Fault Bit6 Processor Fault Bit5 Memory Fault Bit4 Reserved Bit3 Reserved Bit2 Temperature Fault Bit1 Auto Span Fault BitO Global Fault 4 2 2 CXT Transceiver Registers 4 2 2 1 Battery Info Multiple Registers When a Detcon smart battery pack is connected to the CXT there are five registers associated with information about that battery The CXT utilizes the PC interface to read battery status and only one Detcon battery pack can be read per CXT The controller can determine the presence of a battery by reading the Status Register register 8204 There are two bits in this sixteen bit register pertaining to the battery e Battery Detect bit 4 lowest bit is 0 and e Battery Fault bit 5 Both bits default to a value of 0 Battery Detect will be set once the first read of the battery over the PC interface was successful Battery Fault will be set if a battery was detected but the last read failed Battery Fault is re evaluated upon every read of the battery which is set to approximately every 5 seconds Register Model CXT IR Instruction Manual Rev 1 4 Page 32 of 46 fJ e detcon inc Model CXT IR 8206 PC Batt Read Fails will increm
16. 26500 000 Do NOT use regular C size batteries as this may cause damage to the sensor assembly 6 Pay attention to the orientation of the batteries when installing in Battery Holder 7 Reattach the battery cover using screws 8 Re install Tri C Battery Holder in Enclosure Base pressing down and rotating clockwise to secure 9 Replace the cover on the J box 5 5 Replacement of Plug in Sensor It is not necessary to remove power while changing the plug in combustible gas sensor in BO order to maintain area classification since it is intrinsically safe NOTE Only replace the plug in sensor with an authorized CXT IR family of gas sensors Locking Setscrew i M Bottom View Locking Setscrew o p d o o9 Plug in Sensor all Mn Bottom view Figure 18 Sensor Cell and ITM Mating 1 Use a 16 Allen wrench to release the locking setscrew that locks the ITM and splashguard adapter assembly together One turn only Do not remove setscrew completely 2 Remove the splashguard 3 Unthread and remove the splashguard adapter assembly from the ITM 4 Gently pull the plug in sensor out of the ITM Verify the gas type and range of the new sensor cell is correct 5 Orient the new plug in sensor so that it matches with the female connector pins When properly aligned press the sensor in firmly to make the proper connection 6 Thread the splashguard
17. Exceptions Enabled Bit 10 08 Reserved set to 0 Bit 07 Reset the microcontroller and wireless radio Bit 06 Reset the microcontroller Bit 05 00 Reserved set to 0 4 2 2 5 Register Status This register contains status of the CXT transceiver and some of the bits have already been covered in the battery description These default to 0 upon reset The bit assignment and description are given below Bit 15 08 Reserved set to 0 Bit 07 Reserved set to 0 Bit 06 Reserved set to 1 Bit 05 I2C Fault on last read of Battery Status Bit 04 Battery Detected Bit 03 Reserved set to 0 Bit 02 Reserved set to 1 Bit 01 Reserved set to 0 Bit 00 Reserved set to 0 4 2 2 6 Register Timestamp Three registers are utilized to maintain a timestamp that increments on the microcontroller after power up These are all set to 0 upon power up or a microcontroller reset The first two registers 8208 and 8209 are internally combined into a single 32 bit register and incremented each second The last register 8210 maintains the millisecond count and will count from 0 to 999 and start over again 5 Service and Maintenance 5 1 Calibration Frequency In most applications monthly to quarterly span calibration intervals will assure reliable detection Upon initial installation and commissioning close frequency tests should be performed weekly to monthly Test results should be recorded and reviewed to determine a s
18. IR should be vertically oriented so that the sensor points straight downward Figure 11 The explosion proof enclosure or junction box is typically mounted on a wall or pole Detcon provides a selection of standard junction boxes in both Aluminum and Stainless Steel If wall mounting without a mounting plate ensure to use at least 0 5 spacers under the NOTE Detcon Aluminum Junction Box s mounting holes to move the sensor assembly away from the wall and allow access clearance to the sensor assembly Model CXT IR Instruction Manual Rev 1 4 Page 11 of 46 detcon inc Model CXT IR When mounting on a pole secure the Junction Box to a suitable mounting plate and attach the mounting plate to the pole using U Bolts Pole Mounting brackets for Detcon Junction Boxes are available separately Wall or other mounting surface A N t 8 32 tapped Use spacers to move ground point sensor assembly away si from wall at least 0 5 23 Typ E 34 NPT Port M mounting m holes E Y E E ITM Assembly il Splash Guard Adapter f Splash Guard 1 m 9 5 7 45 Figure 11 CXT IR Sensor wit
19. OTE sensor is in calibration mode This bit will remain set until the program returns to normal operation c The ITM will display the following sequence of text messages as it proceeds through the AutoZero sequence Zero Cal Setting Zero Zero Saved each will scroll twice d Remove the zero gas and calibration adapter if applicable 3 3 2 AutoSpan The AutoSpan function is used to span calibrate the sensor AutoSpan should be performed periodically or as required AutoSpan should be considered after periods of over range target gas exposure Unless otherwise specified span adjustment is recommended at 50 of range This function is called AUTO SPAN Before performing AutoSpan calibration verify that the AutoSpan level matches the span NOTE calibration gas concentration as described in Section3 7 Set AutoSpan level 3 3 5 Material Requirements e DetconMicroSafe Programming Magnet PN 327 000000 000 e Detcon Splash Guard with integral Cal Port and with Wind Guard PN 613 120000 700 OR Detcon Threaded Calibration Adapter PN 943 000006 132 e Detcon Span Gas Recommended span gas is 50 of range with target gas Other suitable span gas sources containing the target gas in air or N balance are acceptable NOTE Contact Detcon for ordering information on span gas cylinders A target gas concentration of 50 of range is strongly recommended This should be supplied at a controlled flow rate of 200 to 500cc min with 50
20. Protection Circuit accessory if problem is proven RFI induced Contact the Detcon Service Department for further troubleshooting assistance at NOTE 281 367 4100 6 8 Nuisance Alarms e Check condulet for accumulated water and abnormal corrosion on terminal board e f nuisance alarms are happening at night suspect condensation in condulet e Add or replace Detcon s Condensation Prevention Packet PN 960 202200 000 e Investigate the presence of other target gases that are causing cross interference signals e Determine if cause is RFI induced Contact the Detcon Service Department for further troubleshooting assistance at NOTE 281 367 4100 6 9 Transmitter not responding e Verify condulet has no accumulated water or abnormal corrosion e Verify required batteries are installed and have enough charge to power the sensor e Swap with a known good ITM to determine if ITM is faulty Model CXT IR Instruction Manual Rev 1 4 Page 41 of 46 a E Model CXT IR Contact the Detcon Service Department for further troubleshooting assistance at NOTE 281 367 4100 6 10 Low Battery Low Voltage Fault Possible Cause Lithium Ion batteries are depleted e Change out all three of the Lithium lon non rechargeable C size batteries with new batteries Model CXT IR Instruction Manual Rev 1 4 Page 42 of 46 D detcon inc Model CXT IR 7 Customer Support and Service Policy Detcon Headquarters Shipping Address 4055 Tec
21. R Instruction Manual Rev 1 4 Page 45 of 46 a detcon inc Model CXT IR 8 2 Spare Parts Sensor Accessories Calibration Equipment Table 4 Spare Parts Sensor Accessories and Calibration Equipment Part Number Description 613 120000 700 Detcon Splash Guard with integral Cal Port and with Wind Guard 943 000006 132 Detcon Threaded Calibration Adapter 943 01747 TO5 Detcon Teflon Calibration Adapter for Highly Reactive Gases 943 000000 000 Wind Guard 327 000000 000 Detcon MicroSafe Programming Magnet 371 IR1111 000 IR Combustible Cell 897 850902 010 Aluminum Condulet Extended Cover 897 850800 010 Aluminum Condulet Base 976 0003A7 100 2 4Ghz NEMA7 8 Antenna 3 cable 897 860401 316 316SS Mini Condulet Extended Cover 897 860800 316 316SS Mini Condulet base 602 003215 100 CXT IR Housing Bottom Assembly 92C IRO205 100 ITM CXT IR Wireless 360 026500 000 Lithium Battery C 3 6V 976 0BP303 012 Battery Pack 12VDC 500 005180 100 CXT Smart Battery Term Board 602 003870 000 Tri C Size Battery Holder Assembly 960 202200 000 Detcon s Condensation Prevention Packet 303 734231 000 insertion tool CAGE Clamp Connector 8 3 Revision Log Table 5 Revision Log Revision Date Changes Approval 1 0 5118 12 Initial Release LBU 1 1 12 04 12 Adding note requiring r
22. Set in Display Modbus Address CXT Modbus Address Set in Display RXT 320 Compatible Registers for Wireless Transceiver 8192 RXT 320 Device Type R 22 for compatibility 8193 Reserved En 8194 Reserved 2x 8195 Reserved 8196 Reserved ps 8197 Reserved p 8198 Reserved s 8199 Battery Life in Percent R Smart Battery Life remaining in percent 8200 Battery Life in Minute R Smart Battery Life remaining in minutes 8201 Wireless Controller Version R same as register 0027 8202 RF Update Rate Ww Number of seconds to power down transceiver 8203 Control R W Wireless Control 8204 Status R Wireless Status 8205 Input Voltage R Smart Battery voltage or Input Voltage to A D 8206 Battery Error Count R W Smart Battery read error count if detected 8207 Reserved 8208 Timestamp 0 R Time since power applied Seconds High 8209 Timestamp 1 R Time since power applied Seconds Low 8210 Timestamp 2 R Time since power applied Milliseconds Model CXT IR Instruction Manual Rev 1 4 Page 31 of 46 Ll B detcon inc Model CXT IR 4 2 1 CXT Sensor Registers 4 2 1 1 Sensor Faults Register 0005 The sensor fault status register consists of High and Low Status Bits These bits are set reset as faults occur or are cleared Each bit has a particular meaning Register High Byte Low Byte 0005 Status Bits Status Bits Bits read as O are FALSE bits read as
23. Zero AutoSpan Program Mode View Sensor Status Mp App CP App Rf App RfSw 1H Hf Modbus ID Serial Number 4 RF Channel Network ID Sensor Sn 1HHHHHHHE Range Autospan Level Last Cal Days Sensor Life Temperature C Set Gas Type Set Autospan Level Set Gas Factor Bump Test Restore Defaults Set RF Channel Set Modbus ID Model CXT IR Instruction Manual Rev 1 4 Model CXT IR Page 18 of 46 Model CXT IR 3 1 4 Software Flowchart Z IND4 SONA DUQUINU HH HE HH H eseoJoeq oep eseoJou OU spuoges G 1no euii ony dwoud lt WO pjou puooes o OL ydwioud lt LO pjou puooes e eseajes uay sieadde lt ay nun oos 1x9 Buunp auben zo pjoy Areyuawoyy IN adims Arejuawoyy S Z uoneo0 YMS ureJBojd ZNDA L UOIJE907 YoUMg WesIBOld LINDA Z LWOd s LI NOd ON3931 D9P S IND4 2A uedsojny 1HHt oBuey GI HOMISN 3H jouueu au I N lenas H QI SNAPON HEHHE MS 38 HEHEHE ddy Ju S NDA ou S ND4 ou E E L pa10 59y sinejag Z IND4 1 z LNOd 1 Z LND4 IN z LNDA IN Z LNDA IN Z LWDd m jno euij ony jno eui
24. ace including being wet blocked or corroded Sensor assemblies use CXT IR series splashguard adapter assembly with integral filter Clean or replace if necessary e Replace the plug in combustible sensor Contact the Detcon Service Department for further troubleshooting assistance at NOTE 281 367 4100 6 6 Poor Calibration Repeatability Probable Causes Failed sensor use of wrong cal gas or problems with cal gas and delivery interference gases e Check validity of span gas with regulator and sample tubing in place using pull tube or other means check MFG date on cal gas cylinder e Use proper cal gas regulators and tubing for highly corrosive gases HF HCI CI2 NH3 HBR F2 etc Model CXT IR Instruction Manual Rev 1 4 Page 40 of 46 a detcon inc Model CXT IR e Check for obstructions affecting cal gas hitting sensor face including being wet blocked or corroded Sensor assemblies use CXT IR series splashguard adapter assembly with integral filter Clean or replace if necessary e Replace the plug in combustible sensor Contact the Detcon Service Department for further troubleshooting assistance at NOTE 281 367 4100 6 7 Unstable Output sudden spiking Possible Causes Unstable power supply inadequate grounding or inadequate RFI protection e Verify power source is stable e Verify field wiring is properly shielded and grounded e Contact Detcon to optimize shielding and grounding e Add Detcon s RFI
25. adapter assembly onto the ITM to a snug fit and tighten the locking setscrew using the 16 Allen wrench Model CXT IR Instruction Manual Rev 1 4 Page 36 of 46 fJ a detcon inc Model CXT IR 7 Install the splashguard 8 Check and perform zero calibration and span calibration as per Section 3 3 5 6 Replacement of ITM Aluminum Junction Box 1 Remove the power source to the sensor assembly 2 Remove the battery pack from the J box 3 Disconnect all sensor wire connections at the Junction Box Terminal Board taking note of the wire connections and disconnect the RF cable connector NOTE It is necessary to remove power to the Junction box while changing the ITM in order to maintain area classification 4 Use a wrench and the wrench flats provided at the top section of the ITM and unthread the ITM for removal Nn c se a Allen wrench to release the locking cap head screw that locks the ITM and splashguard adapter assembly together One turn only Do not remove setscrew completely 6 Unthread and remove the splashguard adapter assembly and splashguard from the ITM These will be re used with the new ITM 7 Gently remove the plug in combustible gas sensor from the old ITM and install it in the new ITM Orient the plug in sensor pins so that it matches the female connector pins on the new ITM then press the sensor in firmly to make proper connection 8 Thread the splashguard adapter assembly onto the new ITM until s
26. and is made up of four parts Error Reference source not found 1 CXT IR Intelligent Transmitter Module ITM 2 Plug in infrared Sensor 3 CXT Series Bottom Housing 4 Splash Guard 100 Series Bottom Magnetic Ferrite Bead Housing Assembly Programming S Switches AN 34 NPT Locking ET Nut N x 1 o Beg A SN 2 Ji a Plug in H Replaceable x Splash Guard Sensor Cell N Intelligent Transmitter Module ITM Micro processor controlled circuit encapsulated in an Explosion proof housing Figure 3 Sensor Assembly Breakaway NOTE All metal components are constructed from electro polished 316 Stainless Steel in order to maximize corrosion resistance in harsh environments 1 241 CXTI IR Intelligent Transmitter Module The Intelligent Transmitter Module ITM is a fully encapsulated microprocessor based package that accepts a plug in field replaceable combustible gas sensor Circuit functions include Figure 4 e extensive I O circuit protection e sensor pre amplifier e on board power supplies e microprocessor e LED display e magnetic programming switches e built in 2 4GHz radio Model CXT IR Instruction Manual Rev 1 4 Page 3 of 46 detcon inc Model CXT IR Magnetic program switches located on either side of the LED Display are activated by a hand held magnetic pro
27. be charged as needed using Detcon s optional Quad Battery Charger Figure 8 which can charge up to four battery packs at one time The Quad Battery Charger comes with a plug in AC DC adapter that uses a standard 100 240VAC outlet for power The DC end of the adapter plugs into the DC power jack of the charger providing 24VDC The Quad Battery Charger has four charging ports each with 8 pin Beau connectors for battery pack connection The ports and connectors are keyed to prevent incorrect positioning and connection Each port has its own FAULT LED indicator and CHARGE LED indicator and will display either a red light or green light depending on the status of each battery being charged Charging times will vary depending on the charge state of each battery pack but a full charge of a depleted battery pack can take up to 24 hours Model CXT IR Instruction Manual Rev 1 4 Page 6 of 46 detcon inc Model CXT IR Figure 8 Quad Battery Charger Model CXT IR Instruction Manual Rev 1 4 Page 7 of 46 D detcon inc Model CXT IR 1 4 3 Tri C Lithium Battery Pack The Tri C Lithium Battery Pack Figure 9 contains three 3 6V Lithium Primary C size batteries which are not re chargeable This battery pack offers a more compact size and provides the unit with 10 8 volts The batteries are contained in a battery holder mounted in Detcon s stainless steel explosion proof mini condulet This option offers a smaller foot print but provides less run time tha
28. cimal number until the desired ID is displayed Hold the magnet over PGM2 for 3 to 4 seconds to accept the new value The display will scroll ID Saved and revert to Set Modbus ID text scroll Model CXT IR Instruction Manual Rev 1 4 Page 27 of 46 Ll B detcon inc Model CXT IR Move to another menu item by executing a momentary hold or return to normal operation via automatic timeout of about 15 seconds the display will scroll Set Modbus ID four times and then return to normal operation 3 12 Fault Diagnostic Failsafe Feature If the ITM should incur a fault the Global Fault bit will be set on the Modbus output This can occur if the ITM detects a problem with the sensor detects that there is no sensor connected if the ITM has an internal fault or other fault condition The Global Fault bit will be set on the Modbus output until the problem is resolved The display will show the Fault when a magnetic programming tool is swiped across either PGM1 or PGM2 The error codes are defined in Section 6Troubleshooting 4 Modbus TM Communications Modbus communication with a CXT Sensor is normally accomplished using another wireless transceiver such as the RXT 320 which is connected through a RS 485 interface to a Modbus master control unit The control unit can then access the Modbus registers within the CXT to obtain readings and status of the sensor As with normal Modbus operation there can be only one Modbus
29. detcon inc Model CXT IR Operator s Installation and Instruction Manual Covers all Model CXT IR Sensors DETCON Inc 4055 Technology Forest Blvd The Woodlands Texas 77381 Ph 281 367 4100 Fax 281 298 2868 www detcon com September 30 2013 Document 3822 Revision 1 4 D detcon inc Model CXT IR This page left intentionally blank Shipping Address 4055 Technology Forest Blvd The Woodlands Texas 77381 Mailing Address P O Box 8067 The Woodlands Texas 77387 8067 Phone 888 367 4286 281 367 4100 Fax 281 292 2860 www detcon com sales Odetcon com Model CXT IR Rev 1 4 ii a detcon ine Model CXT IR Table of Contents 1 NERO UM CH ON AAA PP O nn 1 1 1 D SGEIDUOR eoe pee eo tette is 1 1 1 1 Non Dispersive Infrared NDIR Optical Sensor Technology eene 1 1 1 2 Principle of Operation usce EL ERR COEM EXE ERA tase tena ee E eerte ELT Ae eges 2 1 1 3 Performance Characteristics nananana a nnne nennen nennen nenne 2 1 2 Modular Design ti RERISD ch eee dep PREIS 3 1 2 1 CXT IR Intelligent Transmitter Module eese esee eene 3 1 2 2 Field Replaceable Sensor n anida 4 1 3 CXT Wireless Network peleineen niser eer yo ped e dee e a e eene epe pl core o eee eis ede ped 5 1 4 Battery Pack Op Sii A on ie e edet ee ets 5 1 4 1 Detcon s Smart Battery Pack esse
30. e sensor Where direct sunlight leads to exceeding the high temperature operating limit use a sunshade to help reduce temperature 2 3 Sensor Contaminants and Interference Detcon CXT IR combustible hydrocarbon gas sensors may be adversely affected by exposure to certain airborne substances Loss of sensitivity or corrosion may be gradual if such materials are present in sufficient concentrations The performance of the IR sensor may be impaired during operation in the presence of substances that can cause corrosion on gold plating Other inhibiting substances are those that can coat the internal walls of the optical chamber and reduce reflectivity These include but are not limited to heavy oil deposits Model CXT IR Instruction Manual Rev 1 4 Page 10 of 46 fJ E detcon inc Model CXT IR dust powder water condensation and salt formation Continuous and high concentrations of corrosive gases such as Cl H5S HCI etc may also have a detrimental long term effect on the sensor s service life The presence of such substances in an area does not preclude the use of this sensor technology although it 1s likely that the sensor lifetime will be shorter as a result Use of this sensor in these environments may require more frequent calibration checks to ensure safe system performance For the CXT IR combustible gas sensors there are no known cross interference gases that are not combustible hydrocarbon gases 2 4 Sensor Mounting The CXT
31. eet decken proved gae eo Qe eL dete codi a 4 Fis re 6 Plug in Sensor ti Eee eer gere eee edite ped eere te tee te ocio 5 Figure 7 Smart Battery Pack etie eerte i ite ete eet lebt lose Mere liedennsade 6 Figure 8 Quad Battery Charger sas nine See espe e Ete t tee dee coe eee en ete 7 Figure 9 Tri C Size Lithium Battery Holdets irpini inane E Ea nennen 8 Figure TO Approval Label e e eR Mem RP 8 Figure 11 CXT IR Sensor with Smart Battery Pack Mounting Dimensions eere 12 Figure 12 CXT IR Sensor with C Cell Batteries eese nennen nennen nennen 13 Figure 13 Terminal Interconnect for Smart Battery PackK ooooonicnncnincinocanocnnocnnonnconncon nono nononoconacnnn ran crnn cra 15 Figure 14 Magnetic Programming Tool 0 0 ee ees esses eene enne en rennen testen nenne tne 17 Figure 15 Magnetic Programming Switches cooconoconoconoconooncooncnnncnnncnnncnoncnnn nono nono nc nn nono nono rennen nennen enne 17 Figure 16 Software Plow Chart iun eite eee ti e eee etee t edere a eee e eoe tates 19 Ligure 17 Modbus M Frame Format iie etilo 28 Figure 18 Sensor Cell and ITM Mating ee eese enne nennen nennen rn nano eren nest nne enne 36 List of Tables Table L Gas Factors ipee ette e Leere ee e gH UR ERR EE rete eee bee lalola be e aeea aert 26 Table 2 Exc ption Codes 5 2 d ael HERES Hp Hep AD ORE Ure ta Re ge 29 Table 3 CXT IR Register Mapa casino 30 Table 4 Spare Parts Sensor Accessories and Calibrati
32. elay should be approximately 150 milliseconds for broadcast requests sent to the CXT Controllers in general can meet this timing because it takes longer than this to generate the next request so it may be unnecessary to make any adjustments Controllers that generate Modbus broadcast requests to the CXT must ensure a NOTE turnaround delay of 150ms is met otherwise the next request can cause the broadcast request to be overwritten and ignored Broadcast requests are not confined to commands to put the network in low power mode but can be used where any normal write command is used 4 2 Modbus Register Map and Directions When the CXT is assigned a Modbus address the following registers become available to the controller for access All CXT sensors implement this register set Some registers are Read Only R and others are Read Write R W as shown by the R W column This equates to specific function codes where Read is function code 03 and Write is function code 06 or 16 A write to a Read Only register is allowed and returns a response but it does not change the NOTE value of the register In some devices this would return an exception code The register map Table 3 for the CXT sensor gives a brief description for each register or register set This information is only meant as a reference The registers are divided into two sections one for the CXT sensor and the other for the CXT transceiver For a more detailed descr
33. emoval of sensor assembly to BM non hazardous location to install or replace batteries 1 2 2 20 13 Corrected title page updated spare parts list drawings LBU 1 3 07 19 13 Updates for battery and sensor cell faults BM Model CXT IR Instruction Manual Rev 1 4 Page 46 of 46
34. ent by four each time there is a failure since there are four attempts before declaring failure This register can be cleared by writing a O to it at any point Once the battery has been detected the controller can read the battery life registers 8199 and 8200 The battery adjusts these values based upon the average current usage If usage varies widely over time it will take some time to re adjust the battery life readings For example an alarm station with no alarms will consume a very small amount of battery but when alarms are active this will jump to a much higher level of usage So in this case battery life may go from several weeks down to several hours The battery life is presented in two forms life remaining in percentage register 8199 and life remaining in minutes register 8200 The battery life remaining is a value between O and 100 and battery life in minutes is an unsigned value between O and 65535 Both readings are generally necessary to provide appropriate feedback to the user Life in minutes is the best for determining when to change the battery For example to be notified a day before the battery needs to be changed set a threshold in the controller to be notified of low battery after 1440 minutes 1 day The maximum value for life remaining in minutes is 65535 45 5 days The battery life for an application can be much greater than the maximum value and the reading will remain at 65535 until it drops below the maximum
35. eration should be given to providing easy access for maintenance personnel and the consequences of close proximity to contaminants that may foul the sensor prematurely In all installations the gas sensor should point straight down Figure 11 Improper sensor NOTE orientation may result in false readings and permanent sensor damage 2 2 6 Placement of RF Antenna Placement of the sensor should have consideration made for line of sight RF transmissions The devices should be placed in a reasonable proximity to other devices in the network Obstacles between CXT transceivers can impact RF line of sight and may result in communication problems The CXT sensor should be in view of at least one other transceiver 2 2 7 Additional Placement Considerations The sensor should not be positioned where it may be sprayed or coated with surface contaminating substances Painting sensor assemblies is prohibited Although the sensor is designed to be RFI resistant it should not be mounted in close proximity to high powered radio transmitters or similar RFI generating equipment When possible mount in an area void of high wind accumulating dust rain or splashing from hose spray direct steam releases and continuous vibration If the sensor cannot be mounted away from these conditions then make sure the Detcon Harsh Location Dust Guard accessory is used Do not mount in locations where temperatures will exceed the operating temperature limits of th
36. et etre Are e e te 18 3 1 3 Program MOE sap see RO Sede CO Ree dee et e PEU etes e vh egere e ds 18 3 1 4 Software FloWChart i i ee HER ph ian Lage le eee banda eth ode Ua eerie ga oe Eee ee desta 19 3 2 Normal Operation retener UR HER 20 3 3 Calibration Mode c ide tn enm et te b HO RE DH ORE EE ados 20 3 3 1 LUI 099 EE 20 3 3 2 EUNTES 21 3 3 3 Material Requirements e esce teet ce a RU eee ee ROR eee eene eeepc ee 21 3 4 Program Modern EE 23 3 4 1 Navigating Program Mode serri oeenn niie bed HE UE o shee a E Ea eaat 23 3 5 View Sensor Stats rH IE o tee OX ERO EIER ERE A 24 3 6 Set Gas Type oro RI Ee RU ae D es 24 3 7 Set Autos pan Levels coin ib ers EO Eu pe CURES 25 3 8 Set Gas A NN 25 3 9 Bump Test oss eco RU ios eid E eS 26 S10 Restore Def ultss i eet REOR a EGRE A SEE IMS 27 SAL Set RE Channel AAA RN 27 Model CXT IR Rev 1 4 iii a En Model CXT IR SALT Set Modbus MID A ere e ee he a Shae Lag Se eg Aga ed ase 27 3 12 Fault Diagnostic Failsafe AAA dheessdeviesven rhe eer thee rere aS a 28 4 Mod bus TM Communications oio ones ese cab Pueeure ebac oi eiat sun cl s pnus bna ue Macs visi bia rd Ui deku bbs EN NEUE 28 4 1 General Modbus Description oooccoonnonnncnnonnnonnconoconocononnno nn nono nono n ran nnne trennen neon neon ne E EOE Eoee ESEE eaei 28 4 1 1 Modbus M Regu sts c ote Eee ete b e tbe es 29 4 1 2 Modbus Broadcast Requests acantelar arane EEE AEE EREE 29 4 2 Modbus Register Map and Directions
37. etcon inc Model CXT IR 2 6 2 Initial Operational Tests After a warm up period of 1 hour or when zero has stabilized the sensor should be checked to verify sensitivity to the target gas 2 6 5 Material Requirements e Detcon Splash Guard with integral Cal Port and with Wind Guard PN 613 120000 700 OR Detcon Threaded Calibration Adapter PN 943 000006 132 OR Detcon Teflon Calibration Adapter for highly reactive gases PN 943 01747 T05 e Detcon Span Gas 50 of range target gas in balance N or Air at fixed flow rate between 200 500cc min 500cc min is preferred Calibration gas generators using perm tubes or electrochemical sources may be used in NOTE place of span gas cylinders 12 Attach the calibration adapter to the Splashguard Adapter Assembly or connect tubing to integral cal port It is recommended that the Wind Guard Detcon PN 943 000000 000 is installed over the Splash Guard during calibration 13 Apply the test gas at a controlled flow rate of 200 500cc min 500cc min is the recommended flow Observe that the ITM display increases to a level near that of the applied calibration gas value NOTE Wind Guard must be used when calibrating with the integral cal port to ensure proper calibration 14 Remove test gas and observe that the display decreases to 0 15 If a calibration adapter was used during these tests remove it from the unit and re install the Splash Guard 16 If the wind guard was used rem
38. ge drops below 7 5 volts When the voltages drops below 7 2 volts the display will change to a steady VOLT display the sensor will then enter into Fault mode and the sensor will no longer provide a valid gas reading 5 4 2 Units with 12V Smart Battery Pack The safety approvals require removing entire sensor assembly to a non hazardous area NOTE before changing out the batteries or battery pack 1 Remove the cover from the J box 2 Unlatch the holding lever on the side of the battery bracket and swing the cover away from the battery pack 3 Remove the battery pack from the J box and replace with new battery pack 4 Swing the cover back over the battery pack and ensure that it is latched 5 Replace the cover on the J box 5 4 3 Units with Tri C sized Lithium Battery Holder NOTE The safety approvals require removing entire sensor assembly to a non hazardous area before changing out the batteries or battery pack Model CXT IR Instruction Manual Rev 1 4 Page 35 of 46 D detcon inc Model CXT IR 1 Remove the cover from the J box Press Tri C Battery Holder down to disengage latch and rotate counter clockwise according to instructions on lid to remove from Enclosure Base Lift Battery Holder from Enclosure Base 3 Unscrew the cover on the battery holder Orientation of batteries marked inside cover and holder 4 Remove the batteries from the battery holder 5 Replace the batteries with the same type Detcon PN 360 0
39. gramming tool allowing a non intrusive operator interface with the ITM The program switches allows calibration without declassifying the area Accessory connections Antenna Power In Figure 4 ITM Circuit Functional Block Diagram O detcon ine O detcon inc O LED Display MODEL Program Switch 1 CXT IR y Program Switch 2 Red ad y ZERO SPAN O H S Sensor_O Housing Bottom Locking Set Screw n Figure 5 Sensor Assembly Front View 1 2 2 Field Replaceable Sensor Detcon s infrared gas sensors are field proven plug in sensors with over sized gold plated connections that eliminate corrosion problems The sensor can be accessed and replaced in the field easily by releasing the locking screw and unthreading the splashguard adapter assembly NOTE Detcon s combustible sensors have a long shelf life and are supported by an industry leading warranty Model CXT IR Instruction Manual Rev 1 4 Page 4 of 46 D detcon inc Model CXT IR T Ei EI Q i Figure 6 Plug in Sensor 1 3 CXT Wireless Network The CXT IR sensor utilizes a transceiver radio based on the IEEE 802 15 4 standard The transceiver operates at 2 4 GHz using DSSS encoding for
40. h Smart Battery Pack Mounting Dimensions Model CXT IR Instruction Manual Rev 1 4 Page 12 of 46 D detcon inc Model CXT IR 94NPT Port N N 22 Typ d ESTI TRI L y A A N Le x Mini Condulet with 30 4 x 0 475 EN Battery Holder and mounting ES Batteri Holas S atteries 7 6 32 tapped ground point an Pat PMZ y Ej E me spa SPAN le TM Assembly Splash Guard Adapter Splash Guard Figure 12 CXT IR Sensor with C Cell Batteries 2 5 Electrical Installation The CXT is designed to be battery operated and normally will not have external cabling or wiring If the sensor requires external wiring the sensor assembly should be installed in accordance with local electrical codes Proper electrical installation of the gas sensor is critical for conformance to electrical codes and to avoid damage due to water leakage If a conduit run exists a drain should be incorporated The drain allows H O condensation inside the conduit run to safely drain away from the sensor assembly The electrical seal fitting is re
41. hnology Forest Blvd Suite 100 The Woodlands Texas 77381 Mailing Address P O Box 8067 The Woodlands Texas 77387 8067 Phone 888 367 4286 or 281 367 4100 Fax 281 292 2860 www detcon com e service O detcon com sales 9 detcon com All Technical Service and Repair activities should be handled by the Detcon Service Department by phone fax or email through the contact information given above RMA numbers should be obtained from the Detcon Service Department prior to equipment being returned For on line technical service customers should have ready the model number part number and serial number of product s in question All Sales activities including spare parts purchase should be handled by the Detcon Sales Department via phone fax or email at contact information given above 7 1 Warranty Notice Detcon Inc warrants the Model CXT IR gas sensor to be free from defects in workmanship of material under normal use and service for one year from the date of shipment on the transmitter electronics See Warranty details in Section 7 2 Detcon Inc will repair or replace without charge any such equipment found to be defective during the warranty period Full determination of the nature of and responsibility for defective or damaged equipment will be made by Detcon Inc personnel Defective or damaged equipment must be shipped to the Detcon Inc factory or representative from which the original shipment was made In all cases
42. i ete iio ee euet bees 41 6 8 Nuisance Ad ias 41 6 9 AAA RN 41 6 10 Low Battery Low Voltage Fault ononcnnnnnnnnnnnnnocnocnnonnconnconoconocnnconnornnonnn ron enne en trennen eren non trennen enne ene 42 7 Customer Support and Service Policy 4 cesse esee ee sete sees eite etes to ette ettet tosta setas etas etas tasso ne ea 43 7 1 Warranty Noli E 43 7 2 CXT IRsSensOr Warranty ice eee itte rete le linda 44 7 2 1 T erms and Condilions o Ra a E A aa tate a eii 44 O E RE 45 8 1 Specifications itte ep Dr e eer De proe re mp db rre 45 6 1 1 System Specifications itin dre s 45 6 1 2 Environmental Specifications eee eese eene eene eene 45 6 1 3 Electrical Specifications le Ete e nee ex uM Le PUR nase ee bake 45 6 1 4 Mechanical Specifications ee et rere eter rr e uk asain ce ER eee E ep I tera 45 8 2 Spare Parts Sensor Accessories Calibration Equipment esee 46 8 3 Revision LOBA bep ae ea ae 46 Model CXT IR Rev 1 4 iv a detson Ine Model CXT IR Table of Figures Figure Sensor Cell Constr cti n i de A aid 2 Figure 2 Principle of Operation 4 tatiana RH Lente pee ie ree eee te Ce SR pet ete Eo dada sa cubes 2 Figure 3 Sensor Assembly Breakaway essen eene e tenente rennen etre testen 3 Figure 4 ITM Circuit Functional Block Diagram sese nre nennen nennen 4 Figure 5 Sensor Assembly Front View iet eei
43. ing 5 years in most industrial environments Model CXT IR Instruction Manual Rev 1 4 Page 1 of 46 DE detcon inc Model CXT IR Porous Membrane Optical Sample Gas Chamber Optical Filter Optical Filter Active Detector Reference Detector Lamp Figure 1 Sensor Cell Construction 1 1 2 Principle of Operation The target gas diffuses through a sintered stainless steel flame arrestor and into the volume of the sample gas optical chamber An alternating miniature lamp provides a cyclical IR radiation source which reflects through the optical gas sample chamber and terminates at the two pyroelectric detectors The active and reference pyroelectric detectors each give an output which measures the intensity of the radiation contacting their surface The active detector is covered by an optical filter specific to the part of the IR spectrum where the target gas absorbs light The reference detector is covered by a filter specific to the non absorbing part of the IR spectrum When present the target gas absorbs a fraction of the IR radiation and the signal output from the active detector decreases accordingly The signal output of the reference detector remains unchanged in the presence of the target gas The ratio of the active reference signal outputs is then used to compute the target gas concentration By using the ratio of the active reference signal outputs measurement drift caused by the changes in the intensity of the IR lamp source o
44. ion and operational parameters including e sensor type e software version number e detection range e AutoSpan level e days since last AutoSpan e estimated remaining sensor life e gas factor e gas type e and sensor ambient temperature From the View Sensor Status text scroll hold the magnet over PGM1 or PGM2 until the arrow prompt appears and continue to hold the magnet in place for an additional 3 to 4 seconds until the display starts to scroll Status Is The display will scroll the complete list of sensor status parameters sequentially When the status list sequence is complete the ITM will revert to the View Sensor Status text scroll The user can either a review list again by executing another 3 to 4 second hold b move to another menu item by executing a momentary hold over PGM1 or PGM2 or c return to normal operation via automatic timeout of about 15 seconds the display will scroll View Sensor Status four times and then return to normal operation 3 6 Set Gas Type The IR sensor has a slightly different linearization requirement for different groupings of target gases The two selections are e LEL and e VOL The Set Gas Type menu function is a simple choice between these two gas type groupings NOTE The default value for Gas Type is methane LEL The menu item appears as Set Gas Type From the Set Gas Type and Range text scroll hold the magnet over PGM1 or PGM2 until the arrow prompt appears and
45. iption of the Register Map please contact Detcon Table 3 CXT IR Register Map Offset Description 0000 CXT IR 100 Device Type R 36 0001 Range R W Detectable Range 0002 Reading R Current Gas Reading 0003 Calibration Level R W Auto Span Level 0004 Life R Sensor Life 0005 Sensor Faults R Fault bits 0006 Sensor Model R IR set to 3 0007 Days since Calibration R 0008 Reserved R 0009 Reserved R 0010 Sensor Temperature R 0011 Gas Factor R 0012 Reserved R 0013 Reserved R 0014 Range divisor R 0015 CONTROL R W 0016 String R Set during production test 0017 String R Set during production test Model CXT IR Instruction Manual Rev 1 4 Page 30 of 46 DC detcon inc Offset String Model CXT IR Description Set during production test String Set during production test String Set during production test String Set during production test Reserved NOT USED Sensor Controller Version Year Week Reserved Reserved Reserved Wireless Controller Version Major Minor Reserved Radio Firmware Version 00 Major Radio Firmware Version Minor Build Radio Software Version Major Minor Wireless ID High 00 XX Wireless ID Low XX XX RF Channel Wireless RF Channel Set in Display Network ID DD DdD D D D D D D D D D D Defaults to RF Channel
46. low power mode there can be no access to any device on the network so changes in sensor readings will not be updated Once a non zero value is written to this register on all transceivers they will begin counting down until the Update Rate register reaches zero at which time all transceivers should be active again and ready for network communication The controller will monitor the update rate time remaining by accessing Update Rate register on the RXT 320 or equivalent that it is attached The Modbus interface remains active only the wireless network is placed in a low power state The value of this register can be between O and 65535 which allows a maximum low power time of 18 2 hours Removal of power will reset Update Rate to O and the transceiver will be active again Model CXT IR Instruction Manual Rev 1 4 Page 33 of 46 Ll B detcon inc Model CXT IR 4 2 2 4 Register Control The CXT transceiver control register is generally unused and should not be written to normally Using the control register the CXT can be reset and Modbus exceptions can be enabled Each bit in the control register can control a particular function and should be read first then modify the bits needed and written back The default state of the register is 0 All reserved bits should always be set to a O when writing The bit assignments are Bit 15 Reserved set to 0 Bit 14 Reserved set to 0 Bit 13 12 Reserved set to 0 Bit 11 Modbus
47. magnet momentarily over PGM2 to increase or PGMI to decrease the AutoSpan Level until the correct level is displayed When the correct level is achieved hold the magnet over PGM2 for 3 to 4 seconds to accept the new value The display will scroll Level Saved and revert to Set AutoSpan Level text scroll Move to another menu item by executing a momentary hold or return to normal operation via automatic timeout of about 15 seconds the display will scroll Set AutoSpan Level 4 times and then return to normal operation 3 8 Set Gas Factor Because of the CXT IR sensor s almost universal response to combustible hydrocarbon gases the CXT IR sensor can be configured and calibrated to detect a variety of combustible gases The detected gas is referred to as the target gas and the span calibration gas is referred to as the cal gas In cases where the cal gas is different from the target gas the Set Gas Factor menu function is used to maintain accuracy This feature allows for a significant degree of flexibility in the detection and span calibration process NOTE The default value for Gas Factor is 1 0 This would be used when the target gas is the same as the cal gas Set Gas Factor is used to make the appropriate signal sensitivity adjustment when the target gas 1s different from the cal gas This is necessary because the IR sensor has different signal strengths for each combustible hydrocarbon gas The Gas Factor value is adjustable from 0 2 to 5
48. master that polls all the other devices on the network which are considered Modbus slaves Each sensor must have a unique Modbus address and be on the same RF channel for communication to work properly on the wireless network Both the Modbus ID and the RF channel are set on the CXT sensor using the display The Modbus master control unit with RXT 320 transceiver or equivalent is responsible for broadcasting requests and receiving slave device responses The CXT sensor receives these requests through its own internal transceiver and responds if the Modbus address and proper register set matches The response will be received by the RXT 320 and presented to the master control unit across the RS 485 interface 4 1 General Modbus Description The Modbus communication uses the RTU transmission mode per the Modbus specification The basic frame format for Modbus consists of a Modbus address function code data and CRC Address Field Function Code Data CRC Figure 17 Modbus Frame Format The Modbus ID Field is the unique Modbus address of each device on the network The Function Code is the function to be performed The Data contains read or write data and is formatted according to the function being performed The CRC Cyclic Redundancy Code is used to detect errors in the frame Frames with errors are invalid and ignored Model CXT IR Instruction Manual Rev 1 4 Page 28 of 46 fJ a
49. mbustible sensor if error continues Contact the Detcon Service Department for further troubleshooting assistance at NOTE 281 367 4100 6 4 Stability problems Probable Causes Failed sensor empty or close to empty cal gas cylinder problems with cal gas and delivery e Check validity of span gas using pull tube or other means check MFG date on cal gas cylinder e Use proper cal gas regulators and tubing for highly corrosive gases Model CXT IR Instruction Manual Rev 1 4 Page 39 of 46 p E Model CXT IR e Check for obstructions affecting cal gas hitting sensor face including being wet blocked or corroded Sensor assemblies use CXT IR series splashguard adapter assembly with integral filter Clean or replace if necessary e Replace the plug in combustible sensor Contact the Detcon Service Department for further troubleshooting assistance at BOTE 281 367 4100 6 5 Clearing problem Probable Causes Failed sensor cal gas not removed at appropriate time problems with cal gas and delivery background of target gas e The sensor must recover to lt 10 of range in lt 5 min after Span calibration is complete e Use bottled air zero air or N if there is a known continuous background level e Check validity of span gas using pull tube or other means check MFG date on cal gas cylinder e Use proper cal gas regulators and tubing for highly corrosive gases e Check for obstructions affecting cal gas hitting sensor f
50. n Detcon s Smart Battery Pack The CXT IR sensors will operate up to 60 days before battery replacement is needed The addition of Detcon s Stainless Steel Mini Condulet provides Class I Div 1 Group B C and D ratings Figure 9 Tri C Size Lithium Battery Holder 2 Installation 2 1 Hazardous Locations Installation Guidelines for Safe Use 1 Install the sensor only in areas with classifications matching the approval label Follow all warnings listed on the label DETCON THE WOODLANDS TEXAS USA MODEL CXT IR p qom i o WE CAUTION READ INSTRUCTION MANUAL detcon inc x iss OPERATI Q PF o M WARNINGS SUBSTITUTION OF COMPONENTS MAY IMPAIR INTRINSIC SAFETY REPLACE RATED 7 2 LU 2 mA MAX BATTERIES IN NON HAZARDOUS AREA DO NOT T4 T amb 40 60 C OPEN WHEN AN EXPLOSIVE GAS ATMOSPHERE IS PRESENT AVOID STATIC DISCHARGE BY 112 G Ex d Tb ib IIB T4 WiPING PLASTIC WITH DAMP CLOTH Figure 10 Approval Label Model CXT IR Instruction Manual Rev 1 4 Page 8 of 46 NM detcon inc Model CXT IR 2 Do not remove the junction box cover while in the classified are unless it is conformed the there is no explosive gas levels in the area 3 A good ground connection should be verified between the sensor s metal enclosure and the junction box If a good ground connection is not made the sensor can be grounded to the junction box using the sensor s exter
51. nal ground lug Verify a good ground connection between the junction box and earth ground 4 Proper precautions should be taken during installing and maintenance to avoid the build up of static charge on the plastic components of the sensor Splash Guard and Antenna Dome Cover Wipe with damp cloth on plastic components to avoid static discharge 5 Do not substitute components Substitution of components may impair the intrinsic safety rating 6 Do not operate the sensor outside of the stated operating temperature limits 7 Do not operate the sensor outside the stated operating limits for voltage supply 8 These sensors meet ATEX standards EN60079 0 EN60079 1 and EN60079 11 9 These sensors have a maximum safe location voltage of UM 30V 10 These sensors pass dielectric strength of 500VRMS between circuit and enclosure for a minimum of 1 minute at a maximum test current of 5mA 11 The CXT IR must only use combustible sensing cell model 371 IR11I1 000 WARNING CSA certification does not include wireless communication or Modbus used for combustible gas performance the wireless communication or Modbus may only be used for data collection or record keeping with regard to combustible gas detection Gas indication and alarm fnctions for performance are only permitted locally by the detector 2 2 Sensor Placement Selection of sensor location is critical to the overall safe performance of the product Six factors play an important role in
52. nel From the Set RF Channel text scroll hold the programming magnet over PGM1 or PGM2 until the arrow prompt appears and continue to hold the magnet in place for an additional 3 to 4 seconds until the display starts to scroll Set Channel The display will then switch to XX where XX is the current RF channel Swipe the magnet momentarily over PGM2 to increase or PGMI to decrease the hexadecimal number until the desired ID is displayed Hold the magnet over PGM2 for 3 to 4 seconds to accept the new value The display will scroll Channel Saved and revert to Set RF Channel text scroll Move to another menu item by executing a momentary hold or return to Normal Operation via automatic timeout of about 15 seconds the display will scroll Set RF Channel four times and then return to Normal Operation 3 11 1 Set Modbus ID The CXT IR sensor can be polled serially via RS 485 Modbus RTU Set Modbus ID is used to set the Modbus serial ID address It is adjustable from 01 to 256 in hexadecimal format 01 FF hex The menu item appears as Set Modbus ID From the Set Modbus ID text scroll hold the programming magnet over PGM1 or PGM2 until the arrow prompt appears and continue to hold the magnet in place for an additional 3 to 4 seconds until the display starts to scroll Set ID The display will then switch to XX where XX is the current ID address Swipe the magnet momentarily over PGM2 to increase or PGMI to decrease the hexade
53. nug tighten the locking cap head screw and reinstall splashguard 9 Feed the sensor assembly wires and RF cable through the female NPT port and thread the assembly into the J box until tight and the ITM faces toward the front access point Use the locking nut to secure the ITM in this position 10 Re connect the sensor assembly wires to the terminal board inside the Junction Box 11 Re connect the RF cable to the antenna cable 12 Install the battery pack 13 Check and or perform Zero Calibration and Span Calibration in accordance with Section 3 3 5 7 Replacement of ITM Stainless Steel Mini Condulet Remove the cover of the battery holder and remove the batteries 2 Remove the battery holder from the J box by removing the two 6 32 screws at the bottom of the housing NOTE It is necessary to remove power to the Junction box while changing the ITM in order to maintain area classification Model CXT IR Instruction Manual Rev 1 4 Page 37 of 46 a detcon inc 10 11 12 13 14 15 16 Model CXT IR Disconnect the sensor wire connections from the shorting blocks taking note of the wire connections Disconnect the RF cable connector The wire splice shorting blocks can be difficult to remove wires from By using a pair of needle nose pliers and twisting the wires while pulling them out of the shorting blocks can make the task easier Use a wrench and the wrench flats provided at the top secti
54. oiny r 4 jno eui ony qi snqpow 12S jauueyd JH 19S synejag e1o1seH A A IND4 e wod Z LNDA S LWOd 9ul 329p S LWDd jnoeuin Muu z Z LNDA peels 1891 dung Z LNDA N Z LINDA Z LNDA jno eult ony N Z LWD4 1591 dung a no w L ony 10 984 SED J9S zno pas LINDA 9ep S NDA f ou s S ND4 e oui Es XX adAL Le EN m Z LNDA 1 Z LNDA IW Z LND4 N z LWOd Lh i _ o u gny H jno euioiny ed seo 19s 937 uedsoiny 195 Hei ddy do HE Ht ddy dw iH e LWOd N z Wod MO SUILL ony NDA Wd SNJE S JOSUIS MalA 01 ZNDA Y 1 NDA uonejado jeuuoN Figure 16 Software Flow Chart Page 19 of 46 Rev 1 4 Model CXT IR Instruction Manual Ll B detcon inc Model CXT IR 3 2 Normal Operation In normal operation the ITM Display will be blank and will display the gas reading once every 10 seconds for about 2 seconds normally appear as 0 At any time swiping a magnet across either PGM1 or PGM2 will cause the ITM to display the units and gas type i e
55. on Equipment eee 46 Table 5 REVISION E08 eet Deere et E E iie den de dette 46 Model CXT IR Rev 1 4 M D detcon inc Model CXT IR This page left intentionally blank Shipping Address 4055 Technology Forest Blvd The Woodlands Texas 77381 Mailing Address P O Box 8067 The Woodlands Texas 77387 8067 Phone 888 367 4286 281 367 4100 Fax 281 292 2860 www detcon com sales Odetcon com Model CXT IR Rev 1 4 vi fJ 3 detcon inc Model CXT IR 1 Introduction 1 1 Description Detcon Model CXT IR combustible gas sensors are non intrusive Smart sensors designed to detect and monitor combustible hydrocarbon gases in the air with a detection range of 0 100 LEL Lower Explosive Limit The sensor features an LED display of current reading fault and calibration status A primary feature of the sensor is its method of automatic calibration which guides the user through each step via fully scripted instructions illustrated on the LED display The microprocessor supervised electronics are enclosed in an encapsulated module and housed in an explosion proof casting The unit includes e a built in 2 4GHz radio to transmit status wirelessly to a controller aia e a four character alpha numeric LED to display sensor readings and e amenu driven interface when the hand held programming magnet is in use 1 111 Non Dispersive Infrared NDIR Optical
56. on of the ITM and unthread the ITM until 1t can be removed Use a Allen wrench to release the locking cap head screw that locks the ITM and Splashguard Adapter Assembly together One turn only Do not remove setscrew completely Unthread and remove the splashguard adapter assembly and splashguard from the ITM These will be re used with the new ITM Gently remove the plug in combustible gas sensor from the old ITM and install it in the new ITM Orient the plug in sensor pins so that it matches the female connector pins on the new ITM then press the sensor in firmly to make proper connection Thread the splashguard adapter assembly onto the new ITM until snug tighten the locking cap head screw and reinstall splashguard Feed the sensor assembly wires and RF cable through the female NPT port and thread the assembly into the J box until tight and the ITM faces toward the front access point Use the locking nut to secure the ITM in this position Re connect the sensor assembly wires to the shorting blocks by pushing the wire straight into the block board inside the Junction Box Red to red and black to black Re connect the RF cable to the antenna cable Install the battery holder in the J box Install the batteries into the housing Replace the battery holder cover Check and or perform Zero Calibration and Span Calibration per Section 3 3 6 Troubleshooting Guide If the ITM detects any functional errors the ITM
57. ove the wind guard Initial operational tests are complete CXT IR Combustible gas sensors are factory calibrated prior to shipment and should not require significant adjustment on start up However it is recommended that a complete calibration test and adjustment be performed 16 to 24 hours after power up Refer to calibration instructions in Section 3 3 Model CXT IR Instruction Manual Rev 1 4 Page 16 of 46 D detcon inc Model CXT IR 3 Operation The Operator Interface of the Model CXT Series gas sensors is accomplished via two internal magnetic switches located to either side of the LED display Figure 15 The two switches labeled PGM1 and PGM2 allow for complete calibration and configuration eliminating the need for area de classification or the use of hot permits DETCON 3270 PROGRAMMING MAGNET Figure 14 Magnetic Programming Tool The magnetic programming tool Figure 14 is used to operate the magnetic switches Switch action is defined as momentary contact a swipe a 3 second hold and a 10 second hold Hold times are defined as the time from the point when the arrow prompt appears Swiping the magnet does not display the prompt For momentary contact use the programming magnet is briefly held over a switch location or swiped For 3 second hold the programming magnet is held in place over the switch location for three seconds For 10 second hold the programming magnet is held in place over the switch loca
58. quired to meet the National Electrical Code per NEC Article 500 3d or Canadian Electrical Code Handbook Part 1 Section Model CXT IR Instruction Manual Rev 1 4 Page 13 of 46 D detcon inc Model CXT IR 18 154 Requirements for locations of electrical seals are covered under NEC Article 501 5 Electrical seals also act as a secondary seal to prevent water from entering the wiring terminal enclosure However they are not designed to provide an absolute watertight seal especially when used in the vertical orientation A conduit seal is typically required to be located within 18 of the J Box and Sensor NOTE Assembly Crouse Hinds type EYS2 EYD2 or equivalent are suitable for this purpose The Detcon Warranty does not cover water damage resulting from water leaking into the enclosure NOTE Any unused ports should be blocked with suitable male NPT plugs Detcon supplies one NOTE NPT male plug with each J box enclosure If connections are other than NPT use an appropriate male plug of like construction material If the Detcon CXT IR was ordered with battery packs no wiring is necessary Although an external 24V source can be applied in some instances If an external power source is incorporated wire the external power source to the Terminal Interconnect board as prescribed in Figure 13 Do not apply System power to the sensor until all wiring is properly terminated CAUTION 2 6 Initial Start Up 2 5 1 Applying Powe
59. r changes in the optical path s reflectivity is prevented Figure 2 Principle of Operation i Reference Detector Output IR Lamp Source ia Y A Active Detector Output Gas Present Target Gas Not Present Figure 2 Principle of Operation 11 3 Performance Characteristics The IR sensor maintains strong sensitivity to most all combustible hydrocarbon gases within the LEL range When compared with the typical catalytic bead LEL sensor the IR sensor exhibits improved long term zero and span stability Typical zero calibration intervals are quarterly to semi annual and typical span intervals are semi annual to annual NOTE Actual field experience is always the best determination of appropriate calibration intervals The CXT IR sensor will not respond to combustible gases that are not hydrocarbons such NOTE as H2 NH3 CO H2S etc It can only be used to measure hydrocarbon type gases The IR sensor generates different signal sensitivity levels for different combustible hydrocarbon target gases Unless otherwise specified the CXT IR sensor will be factory calibrated for methane service If the Model CXT IR Instruction Manual Rev 1 4 Page 2 of 46 a detcon inc Model CXT IR target hydrocarbon gas is other than methane then the unit will have to be span calibrated and configured in accordance with this CXT IR sensor instruction manual 1 2 Modular Design The Model CXT IR Sensor Assembly is completely modular
60. r to the Unit A 24V solar panel is the most common option for supplying external power A T solar panel will recharge the Detcon Smart Battery Pack It CANNOT be used with CAUTION he C cells A 24V input with the C cells will damage the cells 1 Remove the junction box cover 2 If external power is to be applied to the unit connect incoming 24V to the terminal labeled and 24V Return to the terminal labeled 3 Install the batteries NOTE The safety approvals require removing entire sensor assembly to a non hazardous area before changing out the batteries or battery pack a For units utilizing the 12V Smart Battery Pack Figure 13 plug the battery pack into the terminal board If the sensor has a power switch power will not be applied until the switch is turned on If the unit does not have a power switch power will be applied and the unit will proceed to power up Section 2 6 b If the unit utilizes the C sized lithium 3 6V batteries and battery holder install the batteries properly If the sensor has a power switch power will not be applied until the switch is turned on If the unit does not have a power switch power will be applied and the unit will proceed to power up Section2 6 Model CXT IR Instruction Manual Rev 1 4 Page 14 of 46 D Model CXT IR detcon inc 4 Replace the junction box cover after Initial Start Up To External 24V Power
61. robustness in noisy conditions and to resist jamming DSSS transmits data across a wider frequency range than the actual frequency range required for the information This operation minimizes cross talk and interference from other transceivers and is less susceptible to noise from other sources The IEEE 802 15 4 defines 16 separate RF Channels that can be used in the 2 4 GHz range The default channel is 1 but can be changed if there is RF interference or if there is an existing network using that channel Transceivers will only respond to other transceivers with the same RF Channel If there are multiple CXT IR networks in the same vicinity each system must reside on a NOTE different RF Channel to keep data from one appearing on the other system The 802 15 4 standard also implements a mesh network allowing any CXT IR transceiver to relay or repeat data between adjacent neighbors This makes the network very robust and provides the following immediate benefits e Allows re routing of data in case of loss of a transceiver e Allows re routing around wireless obstacles e Longer distances between transceivers because data can hop from one transceiver to the next e Included in sensor controller and alarm station transceivers e CXT IR transceivers can be deployed with less concern about physical location 1 4 Battery Pack Options The CXT IR can be powered by a battery pack that enables the IR to be remotely mounted without the need for e
62. ry repair or replacement All warranties and service policies are FOB the Detcon facility located in The Woodlands Texas 7 2 1 Terms and Conditions e The original serial number must be legible on each sensor element base e Shipping point is FOB the Detcon factory e Net payment is due within 30 days of invoice e Detcon Inc reserves the right to refund the original purchase price in lieu of sensor replacement Model CXT IR Instruction Manual Rev 1 4 Page 44 of 46 fJ a detcon inc Model CXT IR 8 Appendix 8 1 Specifications 8 1 1 System Specifications Sensor Type Continuous diffusion adsorption type NDIR Non Disperse Infrared Sub miniature plug in replaceable type Sensor Life 5 years typical Measuring Ranges 0 100 LEL 0 100 by volume Accuracy Repeatability 3 LEL in 0 50 LEL range 5 LEL in 51 100 LEL range Response Time T50 lt 10 seconds T90 lt 30 seconds Warranty 1 year 8 1 2 Environmental Specifications Operating Temperature 40 C to 75 C Storage Temperature 40 C to 75 C Operating Humidity 0 100 RH Non condensing Operating Pressure 10 atmospheric pressure 8 1 3 Electrical Specifications Input Voltage 6 30VDC Power Consumption 25mW typical 420mW max RFI EMI Protection Complies with EN61326 8 1 4 Mechanical Specifications Length 14 4 inches 365mm includes splashguard Width 3 77 inches 96mm Weight 5 5lbs 2 5kg without batteries Model CXT I
63. s ener eene nennen Jj 1 4 2 Quad Battery Charger Optional cesses eene ennt nent eren 6 1 4 3 TrizC Lithium Battery PACK tn e eR Exeter aaa tha eee e PER e Aen estet re ee baits 8 Zo INSTA A EN 8 2 1 Hazardous Locations Installation Guidelines for Safe Use 0 0 0 ceeceescessseceeececeeceeeeeceaeeeeaeecaeeeeaeecsaeeeeneees 8 2 2 Sensor A PEE 9 2 2 1 DNS A cies 9 2 2 2 Leak NIA Eme 10 2 2 3 VENTANA ida 10 2 2 4 Personnel EXPOSUT Cii akin i A e eem etit re preteen 10 2 2 5 Maintenance ACCOSS n re eet i e e hee en eee bd ends vba ee Yun ae nee AR 10 2 2 6 Placement of RE Antennas ie e Ra RERO RE epe petito 10 2 2 7 Additional Placement Considerations eee eese eene enne eene enne 10 2 3 Sensor Contaminants and Interference 0 0 0 ena a e E E E RT AE EEA E EES 10 2 4 Sensor Moun ti PEE 11 2 3 Electrical Installation o teer nde voies 13 2 5 1 Applying Powerto the Unit e eec ete eH het cie toinen eK eo ri Rua eh 14 2 6 Initial Start Up s eU RUE E EE eU e EE RU IRE 15 2 6 1 Combustible Gas Sens OTS eee A et PEE PN Ene tea e a ads 15 2 6 2 Initial Operational Tests iei rete ere te e oe PE EE cocida enne dod 16 2 6 3 Material Requirements esses esee eee nn enne tentent enr en nennen nennen nennen nne 16 enJcoitEet RN 17 3 1 Operator Interface ie Ee ce ott reat iode ise eroe rotes te cres prose teo tette 18 3 1 1 Normal Op ration ee eee t re Entente NO es 18 3 1 2 Calibration Mode lt a eee t
64. sensor signal change after 1 minute the reading will auto adjust to the programmed AutoSpan level The ITM then reports the following messages Remove Gas e Remove the span gas source and calibration adapter The ITM will report a live reading as it clears toward 0 When the reading clears below 10 of range the ITM will display Span Complete and will revert to normal operation If the sensor fails to clear to less than 10 in less than 5 minutes a Clearing Fault will be reported twice and the ITM will return to normal operation aborting the AutoSpan sequence The ITM will continue to report a Clearing Fault until a successful calibration is completed f AutoSpan calibration is complete Model CXT IR Instruction Manual Rev 1 4 Page 22 of 46 a detcon inc Model CXT IR If the sensor fails the minimum signal change criteria a Range Fault will be declared and NOTE the Range Fault bit will be set on the Modbus output If the sensor fails the clearing time criteria a Clearing Fault will be declared and the NOTE Clearing fault bit will be set on the Modbus M output 3 4 Program Mode Program Mode provides a View Sensor Status menu to check operational and configuration parameters Program Mode also provides for adjustment of the AutoSpan Level Gas Factor Gas Type and Range and Serial ID The Program Mode menu items appear in the order presented below View Sensor Status Set Gas Type Set AutoSpan Level Set Gas Factor
65. sh Guard with integral Cal Port and with Wind Guard PN 613 120000 700 OR Detcon Threaded Calibration Adapter PN 943 000006 132 e Detcon Zero Air cal gas PN 942 001123 000 or use ambient air if no target gas is present e Detcon Nitrogen 99 9996 PN 942 640023 100 The zero gas source may be zero air or N if local ambient air contains target or interference gases NOTE a For combustible gas sensors if the ambient air is known to contain no target gas content then it can be used for zero calibration If a zero gas cal cylinder is going to be used attach the calibration adapter and set flow rate of 200 500cc min 500cc min is the recommended flow rate and let sensor purge for to 2 minutes before executing the AutoZero Wind Guard must be used when calibrating with the integral cal port to ensure proper NOTE Pure calibration b From normal operation enter calibration mode by holding the programming magnet over PGMI for 3 seconds The display will then scroll Pgm1 Zero Pgm2 Span Hold the programming magnet over PGM1 for 3 seconds once the lt 4 prompt appears to execute AutoZero or allow to timeout in 5 seconds if AutoZero is not desired Model CXT IR Instruction Manual Rev 1 4 Page 20 of 46 detcon inc Model CXT IR The lt 4 prompt will show that the magnetic switch is activated during the 3 second hold NOTE period Upon entering calibration mode the Modbus status register bit 14 is set to signify the N
66. tion for 10 seconds The 3 and 10 second holds are generally used to enter calibration program menus and save new data The momentary contact is generally used to move between menu items and to modify set point values Arrows and gt are used on the LED display to indicate when the magnetic switches are activated The location of PGMI and PGM2 are shown in Figure 15 y LED Display Programming Switch 3H Programming Switch 2 N SFA o PIRE Figure 15 Magnetic Programming Switches While in the program mode if there is no magnetic switch interaction after 4 consecutive menu scrolls the sensor will automatically revert to normal operating condition While NOTE changing values inside menu items if there is no magnet activity after 3 to 4 seconds the sensor will revert to the menu scroll If the sensor is in Bump Test mode the display will remain active Model CXT IR Instruction Manual Rev 1 4 Page 17 of 46 a detcon inc 3 1 Operator Interface The operating interface is menu driven by the two magnetic program switches located under the target marks of the sensor housing The two switches are referred to as PGM1 and PGM2 The menu list consists of three menu items that include sub menus normal operation calibration mode and program mode 3 1 1 3 1 2 Normal Operation Concentration Reading is displayed once every 10 seconds Calibration Mode Auto
67. to the calibration span gas concentration adjust the AutoSpan level as instructed in Section 3 3 2AutoSpan b From normal operation enter calibration mode by holding the programming magnet over PGMI for 3 seconds NOTE The lt 4 prompt will show that the magnetic switch is activated during the 3 second hold period c The display will then scroll PGM1 Zero PGM2 Span Hold the programming magnet over PGM2 for 3 seconds to execute AutoSpan or allow to timeout in 5 seconds if AutoSpan is not intended The ITM will then scroll Apply XX 4o Gas Upon entering calibration mode the Modbus status register bit 14 is set to signify the NOTE sensor is in calibration mode This bit will remain set until the program returns to normal operation d Apply the span calibration test gas for combustible gas sensors at a flow rate of 200 500cc min 500cc min is the recommended flow rate As the sensor signal begins to increase the display will switch to flashing XX reading as the ITM shows the sensor s as found response to the span gas presented If it fails to meet the minimum in range signal change criteria within 2 minutes the display will report Range Fault twice and the ITM will return to normal operation aborting the AutoSpan sequence The ITM will continue to report a Range Fault until a successful calibration is completed NOTE Wind Guard must be used when calibrating with the integral cal port to ensure proper calibration Assuming acceptable
68. uitable calibration interval due to differences in industrial environments Model CXT IR Instruction Manual Rev 1 4 Page 34 of 46 fJ a detcon inc Model CXT IR 5 2 Visual Inspection The Sensor should be inspected annually for the following e Inspect the sensor for signs of corrosion pitting and water damage e Remove the Splash Guard and inspected it for blockage broken cracked or missing pieces e For H2S Sensor assemblies inspect CXT IR Series Splashguard Adapter Assembly with integral filter PN 602 003552 100 for blockage of filter material e Inspect inside of the Junction Box for signs of water accumulation signs of corrosion e Check wiring to ensure there are no loose or pinched wires and all connections are clean and tight 5 3 Condensation Prevention Packet A moisture condensation packet Detcon PN 960 202200 000 should be installed in every explosion proof Junction Box The moisture condensation prevention packet will prevent the internal volume of the J Box from condensing and accumulating moisture due to day night humidity changes This packet provides a critical function and should be replaced annually 5 4 Replacement of the Batteries Battery Pack 5 4 1 Low Battery Fault Indication The CXT IR Sensor incorporates a Low battery fault message which will appear as an alternating display between the current gas reading and VOLT on the sensor display This fault will appear when the battery volta
69. value Life in percentage provides a more efficient tracking method Percentage will track starting at 100 and drop down as the battery life decreases The controller can therefore use both registers one to represent usage in percentage to present to the user and then use the life in minutes to set a threshold on when a low battery condition exists for changing the battery 4 2 2 2 Wireless Controller Version This is set to a value based upon the version of firmware programmed into the RXT 320 microcontroller It is stored as two byte value representing the major and minor revision numbers So a 0113h 275 decimal represents a major version of 01 and minor version of 13 As software is updated this will be incremented appropriately 4 2 2 3 Register Update Rate The update rate represents the amount of time in seconds the CXT transceiver will be in a low power state Its main purpose is to provide a mechanism to place all wireless transceivers in a system into a low power mode to conserve battery power If there are no batteries used within the network of wireless transceivers this register would not be utilized Upon power up this register is set to O and the CXT transceiver is not in low power mode To place a network to low power mode the controller will generate a broadcast request Modbus address 0 and do a single write function code 06 to register 8202 with the number of seconds the network should go into low power mode During
70. xception code will be returned There are other exception codes defined in Modbus but these are the only ones used by the CXT NOTE When using Detcon controllers Modbus exceptions should be turned off 4 1 2 Modbus M Broadcast Requests The Modbus broadcast request was introduced in the CXT to support commands to be executed across all CXT transceivers simultaneously This is used to place all CXTs in a low power state for a specified time to conserve battery life Only the transceivers radio are placed into a low power state the CXT sensor will continue to operate normally If none of the CXTs are battery powered then there is no need to issue a command to place the transceivers in low power mode According to the Modbus M specification a broadcast request is defined as a request with the Address Field set to 0 and is used only for writing There is no response returned as with normal Modbus transactions since all devices on the system are accessed at the same time Both Function Codes 06 and 16 writes are supported with a broadcast request on the CXT Model CXT IR Instruction Manual Rev 1 4 Page 29 of 46 a E Model CXT IR Since there is no response on the broadcast request there is a requirement to wait for a period of time before sending out the next request This allows all slave devices to process the command before the next request is received also known as the turnaround delay This turnaround d
71. xternal cabling Detcon offers several battery pack options that are factory installed Contact Detcon for more information on these options 14 31 Detcon s Smart Battery Pack The Detcon s plug in Smart Battery Pack Figure 7 provides an output of 12VDC NOTE The CXT IR monitors the battery life of the Smart Battery Pack The battery pack consists of rechargeable Lithium Ion batteries and is equipped with integrated safety electronics that include Model CXT IR Instruction Manual Rev 1 4 Page 5 of 46 D detcon inc Model CXT IR e fuel gauge e voltage e current monitoring circuits e andtemperature monitoring circuits The Smart Battery Pack circuitry continuously monitors the battery s condition and reports critical status information to the wireless transceiver The battery pack is designed to plug onto an 8 pin connector on a terminal board on the sensor The battery pack and terminal board are housed in Detcon aluminum condulet for protection from exposure to outside elements and provide Class I Div 1 Group C and D ratings Operating periods before recharge will vary based on the sensor attached but can be as long as six months and battery life can be up to five years before replacement is required Improper use of the smart battery pack may be hazardous to personnel or the environment NOTE and will void the warranty Figure 7 Smart Battery Pack 1 4 2 Quad Battery Charger Optional Detcon s Smart Battery Pack can

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