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Model CXT-DM

1. Gas CoH30 CHN Alcohols Amines AsFs AsFs AsH BF 1 C2H30 n a 40 340 40 75 n d n d n d n d n d n d n d 4 40 170 n d C2H2 340 40 n a 340 75 n d n d n d n d n d n d n d n d 340 170 1 0 CHN 15 40 75 340 n a n d n d n d n d n d n d n d n d 75 170 4 NH n d n d n d n d n d n d n d n d n d n d n d n d n d AsH3 n d n d n d n d n d 100 0 01 n d n d n a n d n d n d n d n d n d n d n d n d n d n d n d n d n d n a n d n d 170 40 170 340 170 75 n d n d n d n d n d n d n d n d n a n d C 140 40 140 340 140 75 n d n d n d n d n d n d n d n d 140 170 n d n d n d n d n d n d n d n d n d n d n d n d n d n d Ch n d n d n d n d n d n d n d n d n d n d 0 55 n d n d C102 gt 10ppm n d n d n d n d n d n d n d n d n d n d 70 18 n d n d 10 10ppm n d n d n d n d n d n d n d n d n d n d n d n d n d n d n d n d n d n d 100 0 013 n d n d 015 02 n d 4 n d n d C3Hs0CI 90 40 50 340 50 75 n d n d n d n d n d n d n d n d 50 170 n d C Hs0H 180 40 180 340 180 75 n d n d n d n d n d n d n d n d 180 170 n d C HsSH n d n d n d n d n d n d n d n d n d n d n d n d n d C2H4 220 40 220 340 220 75 4 4 n d n d n d n d n d n d 220 170 n d 2 0 275 40 275 340 275 75 n d n d n d n d n d n d n d n d 275 170 n d F2 n d n d n d 1000 0 n d n d n d n d 0 1 0 n d yes n d n d n d CH20 330 40 330 340 330 75 n d
2. 27 Figure 18 Battery Orientation 34 Figure 19 Sensor and ITM 222200000 0 sii 35 Table T Exception Codes esten tested eene ee Pop eri 28 Table 2 CXT DM Register SEE EEN ERE deed Een eun 29 1 3 5 Specie Data NN 42 Table 4 Interfering G ses icti iret erred ere ee SR EDT EY COR edet 44 5 Cross Interterence Table ntt E 45 Shipping Address 4055 Technology Forest Suite 100 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 e Model CXT DM iv a detcon inc Model CXT DM 1 Introduction 1 11 Description Detcon Compact Wireless Sensor Model CXT DM toxic gas and deficiency sensors are non intrusive wireless sensors designed to detect and monitor a wide range of toxic gases in air The unit is designed to work as part of a wireless network of gas sensors and communication is performed via a built in RF transceiver Ranges of detection for toxic gases are from 0 1 up to 0 10 000ppm typical ranges of detection are 0 10pp
3. detcon inc Model CXT DM CXT DM Toxic Gas Sensors CXT DM O2 Deficiency Sensors Operator s Installation and Instruction Manual Covers all Model CXT DM Sensors DETCON Inc 4055 Technology Forest Blvd Suite 100 The Woodlands Texas 77381 Ph 281 367 4100 Fax 281 298 2868 www detcon com February 14 2014 Document 3804 Revision 1 5 a detcon ine Model CXT DM This page left intentionally blank Model CXT DM ii detcon inc Model CXT DM Table of Contents Ll ntreducton E Ree eet uu eoe e CL er eee dnas 1 1 1 Descriptions s eee opt ee et ee E etae etaed demde 1 1 2 2 12 1 CXT DM Intelligent Transmitter 3 1 2 2 Replaceable Sensor ed Ege itte E ter 3 1 3 CXT Wireless ee ec de toten eee tte eod 4 1 4 Battery PaK oie eee eoe quove ate irae ree Riera e ces er 4 14 1 D tconis Smart Battery Pack meum eite eee 4 14 2 TreC Lithium Battery nae e D Ug Hen ne Le T ERE deeds 5 PEN Cbar M 7 2 1 Hazardous Locations Installation Guidelin
4. CHOH 415 220 415 275 415 330 CHSH 100 0 n d nyd 040 wd 10 0 wd nd 8 va x na n d Ph wa SH nd nja Son 100 200 275 200 330 CHCl 200 220 200 275 200 330 n a not applicable n d no data CXT DM Instruction Manual Table 5 Cross Interference Table pg 3 H2 n d n d n d 200 4 3000 0 100 0 n d n d 100 lt 60 100 0 100 0 1 0 3000 0 n d n d 1 lt 15 n d n d 1 0 n d 3000 0 1000 0 n a n a 1 0 1 0 1000 0 1 0 1 lt 5 n d 1 lt 10 100 0 100 0 1 0 003 1 0 3000 0 3000 0 100 0 n d n d Rev 1 5 HBr n d n d n d B RIA HO m bh 15 1 15 1 Page 47 of 52 a detcon inc Model CXT DM Table 5 Cross Interference Table pg 4 Gas HS CH CH SH NO 10 0 PH C2H0 n d n d 5 n d n d n d n d n d C2H2 n d n d 15 n d n d n d n d n d CsHaN n d n d 5 n d n d n d n d n d NH n d 15 30 jd 5 nd nd n d AsH 0 05 0 005 1 0 1006 0 n d
5. default settings are NOTE The following must be performed in order before the sensor can be placed in operation RF Channel 4 The RF Channel should be set appropriately by the operator Section 3 4 6 e Modbus ID 01 The Modbus ID must be set appropriately by the operator Section 3 4 7 AutoSpan Level 50 of range AutoSpan level must be set appropriately by the operator Section 3 4 3 e Range Defaults to range of intelligent plug in sensor must be set to the appropriate level by the operator Section 3 4 2 AutoZero AutoZero Settings lost and user must perform new AutoZero Section 3 3 1 e AutoSpan AutoSpan Settings lost and user must perform new AutoSpan Section 3 3 2 3 4 6 Set RF Channel Set RF Channel is used to set the RF Channel used for communication There are 16 possible RF channels of the sensors must be on the same RF Channel for the network to operate properly The RF Channel is settable from 0 to 15 The current RF Channel can be viewed in View Sensor Status The menu item appears Set RF Channel From the Set RF Channel text scroll hold the programming magnet over PGM1 or PGM2 until the p prompt appears and continue to hold the magnet in place for an additional 3 4 seconds until the display starts to scroll Set Channel The display will then switch to XX where is the current RF Channel Swipe the magnet momentarily over PGM2 to in
6. n d 01 0 1 Br a d 15 15 nd 5 10 n d n d n d n d 170 415 n d n d n d n d 1 4 C n d n d 140 415 n d n d n d n d 1 4 co n d 15 lt 0 3 n d n d 5 0 5 4 n d n d Ch n d 15 0 75 n d 5 75 n d n d n d C102 gt 10ppm n d 15 0 25 n d n d n d n d n d 35 0 n d 5 1 66 4 n d n d ClO2 10ppm n d 10 0015 n d n d n d n d n d yesn d yesn n d 1 4 0 05 0 006 1 0 n d 1004 0 n d n d n d 01 014 C HsOCI n d n d n d 50 415 n d 50 275 n d n d n d n d n d n d C H OH n d 180 415 180 275 n d n d n d nije n d 1 4 CoHsSH n d 03 58 35 lt 6 n d 5 15 n d n d 1 4 C2H4 n d n d n d n d 220 415 n d 220 275 n d n d n d n d n d n d C2H40 ni 215 415 275 275 nd n d 1 1 5 4 n d n d n d n d n d 100 0 1 0 05 0 1702 n d n d CH20 n d 330 415 330 275 nd n d ajd nyd ajd 1 4 0 05 0 005 1 0 1 4 100 0 n d n d 01 013 n d 120 1 n d n d n d n d n d n d 100 0 1 0 25 0 1 0 1 n d 0 3 0 1 H ppm yd 15 3 35710 nd 50 na LEL n d n d yesn d 1 0 n d n d n d yesn d n d 10 0 n d n d n d HBr 01 0 1022775 n d 1004 0 n d n d 01 0 0 1 03 HC 01 0 10 2 75 n d 100 0 n d n d 01 0 0 1 03 HCN n d 10 0 n d n d n d n d n d n d 100 0 10 12 01 0 n d 0 3 0 HF n d 10 0 n d 1004 0 100 1 n d n d 01 0 HS n d 1 4 n d n d n d 35 2 n d 5
7. RXT 320 Compatible Registers for Wireless Transceiver 8192 RXT 320 Device R 22 for compatibility 8193 Reserved 8194 Reserved 8195 Reserved 8196 Reserved ER 8197 Reserved 8198 Reserved CXT DM Instruction Manual Rev 1 5 Page 29 of 52 detcon inc Model CXT DM 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 W 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 4 2 1 Sensor Registers 4 211 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 0005 High Byte Status Bits Low Byte Status Bits Bits read as are FALSE bits read as 1 are TRUE Status Bits High By
8. 12 Reserved set to 0 Bit 11 Modbus 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 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 CXT DM Instruction Manual Rev 1 5 Page 32 of 52 a detcon inc Model CXT DM 5 Service and Maintenance Calibration Frequency In most applications monthly to quarterly span calibration intervals will assure reliable detection However industrial environments differ Upon
9. 50 100 50 135 n d n d n d n d 50 150 n d n a 50 180 n d C2H50H n d 180 140 180 100 180 135 n d n d n d 180 150 n d 180 50 n a n d CoHsSH n d n d 300 5 n d 1 0 6 4 4 n d n d n d n d n d n d C2H4 n d 220 140 220 100 220 135 n d n d n d n d 220 150 n d 220 50 220 180 n d C2H40 n d 275 140 215 100 275 135 n d n d n d n d 275 150 n d 275 50 275 180 n d F2 5000 0 n d 1000 0 n d 1 1 3 4 n d n d n d n d n d n d n a CH 0 n d 330 140 330 100 1330 135 n d n d n d n d 330 150 n d 330 50 330 180 n d 5000 0 n d 300 0 n d 05 0 04 n d n d 0 2 0 11 n d 5 yesn d n d n d n d 5000 0 n d 1000 0 n d 1 0 n d n d n d n d n d n d n d n d H2 ppm n d n d 300 lt 30 n d 1 0 n d n d n d n d n d n d n d n d LEL 1000 0 n d 50 6 n d 5 0 n d n d n d n d n d n d n d n d HBr 5000 0 n d 1000 0 n d 5 1 n d yesn d n d n d n d n d n d n d 5000 0 n d 1000 0 n d 9 1 n d l yesn d n d n d n d n d n d n d HCN 5000 0 n d 1000 0 n d 5 1 n d n d n d n d n d n d n d n d HF 5000 0 n d 1000 0 n d 1 0 4 n d yesn d 01 0 n d n d n d n d yesn d 25 n d n d 300 1 5 n d 12 02 n d n d n d n d n d n d n d n d n d 415 140 415 100 415 135 n d n d n d n d 415 150 n d 415 50 415 180 n d CHsSH n d n d 300 3 n d 1 0 4 n d n d n d n d n d n d n d n d INO n d n d 300 0 n d 1 0 n d n d n d n d n d n d n d n d INO n d n d 300 0 n d 1 1 n d n d n d n d n d n d n d n d
10. Sensing Electrode The deficiency sensor technology is a two electrode galvanic metal air battery type cell which is housed as a field replaceable intelligent plug in sensor The cell is diffusion limited and functions as a direct current generator proportional to the amount of oxygen adsorption The sensors are temperature compensated and show good accuracy and stability over the operating temperature range of 20 to 50 C 4 to 122 Fahrenheit The sensor is warranted for two years and has an expected service life of up to 2 5 years in ambient air at 20 9 oxygen Air Supply Diffusion Barrier Cathode Load Electrolyte Resistor Solution Anode Figure 3 Construction of Galvanic Cell 1 2 Modular Design The Model CXT DM Sensor Assembly is completely modular and is made up of four parts See Figure 4 for Assembly Breakaway 1 CXT DM Intelligent Transmitter Module ITM 2 Plug in Electrochemical Sensor varies by gas type and range 3 CXT Series Bottom Housing 4 Splash Guard CXT DM Instruction Manual Rev 1 5 Page 2 of 52 detcon inc Model CXT DM Magnetic 5 2r 700 ie 2 Programming Ferita Bead ottom Housing Assem i i Switches 34 NPT Locking Nut E l i Plug in Replaceable Intelligent Transmitter Module ITM Micro processor controlled circuit enc
11. 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 functions for performance are only permitted locally by the detector CXT DM Instruction Manual Rev 1 5 Page 7 of 52 a detcon inc Model CXT DM 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 selection of sensor locations 1 Density of the gas to be detected 2 Most probable leak sources within the industrial process 3 Ventilation or prevailing wind conditions 4 Personnel exposure 5 Placement of transmitting antenna 6 Maintenance access Density Placement of sensors relative to the density of the target gas is such that sensors for the detection of heavier than air gases should be located within 4 feet of grade as these heavy gases will tend to settle in low lying areas For gases lighter than air sensor placement should be 4 8 feet above grade in open areas or in pitched areas of enclosed spaces 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 experien
12. 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 CXT DM Instruction Manual Rev 1 5 Page 39 of 52 a detcon Inc Model CXT DM 8 CXT DM Sensor Warranty Plug in Sensor Warranty Detcon Inc warrants under normal intended use each new plug in sensor per the period specified in the Warranty column of Table 3 Sensor Specific Data See section 9 2 Sensor Specific Data and under the conditions described as follows The warranty period begins on the date of shipment to the original purchaser The sensor element is warranted to be free of defects in material and workmanship Should any sensor fail to perform in accordance with published specifications within the warranty period return the defective part to Detcon Inc 4055 Technology Forest Dr The Woodlands Texas 77381 for necessary repairs or replacement Terms amp Conditions e The original serial number must be legible on each sensor element base e Shipping point is FOB the Detcon factory e
13. 0 5000 0 n d 300 0 n d 1 14 0 150 12 l l theory n d n d n d n d n d 0 1 0 07 5000 0 4 1000 0 4 1 0 n d n d n d n d n d n d n d n d PH 5000 0 n d 300 0 n d 0 5 0 04 n d n d 02 015 n d 5 yesn d n d n d n d SiH4 5000 0 n d 300 0 n d 05 0 04 n d n d 0 2 0 11 n d 5 yesn d n d n d n d 502 n d n d 300 lt 5 4 1 0 5 n d n d n d n d n d n d n d n d C4H602 n d 200 140 200 100 200 135 n d n d n d n d 200 150 n d 200 50 200 180 n d 1 n d 200 140 200 100 200 135 n d n d n d n d 200 150 n d 200 50 200 180 n d n a not applicable n d no data CXT DM Instruction Manual Rev 1 5 Page 46 of 52 detcon inc Model CXT DM Gas CH CHO CHO 40 220 40 275 40 330 340 220 340 275 340 330 CHIN 75 220 75 275 75 330 NHs 000 nd Ash wd nd 1000 wd 170 220 170 275 170 330 C 140 220 140 275 140 330 0 0 n d nyd n d n d CsHsOC 50 220 50 275 50 330 C HSOH 180 220 180 275 180 330 CaHsSH _ 1000 n a 220 275 220 330 CHO 275 220 275 3 0 ws nf CHO 50 00 330275 Ges a d n d ENTM Ho ppm 0 Ha ppm 100 80 n d n d 220 n d n d n d _ O ve njd n d E njd HS 1000
14. 05 n d n d n d CH 0H n d njd 415 275 n d CHsSH d 1 02 35 4 n d 5 10 n d NO n d 15 75 n d n d n d n d n d 100 0 n d 5 lt 1 5 n d n d n d NO 1 4 15 075 35 0 n d n a nd nd ajd 0 n d 1 015 4 n d n d n d n d 10 0 100 0 1 07 n a n d 0 3 0 03 nd 1 0 n d 100 0 n d n d n a 03 0 PH 0 05 0 005 1 0 n d 1004 0 n d n d n d nja SiH 0 05 0 005 1 0 n d n d n d n d n d n d 100 0 4 n d n d 0 1 0 13 802 n d 15 0 35 0 n d 5 5 n d nd 0 n d n d n d n d 200 415 n d n 1 4 n d n d n d n d C HsCI n d n d n d n d 200 415 n d 200 275 n d n d n d n d n d n d n a not applicable n d no data CXT DM Instruction Manual Rev 1 5 Page 48 of 52 a detcon inc Model CXT DM Table 5 Cross Interference Table pg 5 Gas PF SiH Si SiF4 502 CaHsS C4H4S CeH5CHs WFe C4He02 C
15. C typical See Table 3 Sensor Specific Data Storage Temperature 35 C to 55 C typical Operating Humidity 10 95 RH Continuous Duty See Table 3 Sensor Specific Data 0 100 RH Short Term Duration Only Operating Pressure Ambient 10 Air Velocity 0 5 meters second 9 1 3 Electrical Specifications Input Voltage 7 30 VDC Power Consumption 20mW Low Power Mode 100mW Typical 500mW RFI EMI Protection Complies with EN61326 Cable Requirements Power Analog 2 wire shielded cable Maximum distance is 13 300 feet with 14 AWG CXT DM Instruction Manual Rev 1 5 Page 41 of 52 a detcon inc Model CXT DM 9 1 4 Mechanical Specifications ITM 5 165 inches 131 mm 8 5 inches 215mm with Splash Guard Length Width Weight Mechanical Connection Electrical Connection 2 2 inches 55 mm 2 5 Ibs 1 2 Kg Male NPT threaded connection with locking nut four 18 gauge wire leads 5 5 long with RF Cable terminated at SMA 9 2 Sensor Specific Data Gas C2H30 C2H2 NH3 AsH3 Br2 Cle CIO gt 10 CIO lt 10 BoHe C2H50H C2H5SH C2H4 C2H40 F2 CH20 GasName Oxygen Acetaldehyde Acetylene Ammonia Arsine Bromine Butadiene Carbon Monoxide Chlorine Chlorine Dioxide Chlorine Dioxide Diborane Ethanol Ethyl Mercaptan Ethylene Ethylene Oxide Fluorine Formaldehyde Germane Table 3 Sensor Speci
16. 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 ITM Electronics Warranty Detcon Inc warrants under intended normal use each new Compact Wireless Sensor ITM to be free from defects in material and workmanship for a period of one year from the date of shipment to the original purchaser All warranties and service policies are FOB the Detcon facility located in The Woodlands Texas Terms amp Conditions e The original serial number must be legible on each ITM 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 ITM replacement CXT DM Instruction Manual Rev 1 5 Page 40 of 52 a detcon inc Model CXT DM 9 Appendix 9 1 Specifications 911 System Specifications Sensor Type Continuous diffusion adsorption type 3 Electrode Electrochemical Sensor 2 Electrode for Plug in Replaceable Type Sensor Life 2 years typical Measuring Ranges 0 up to 0 10 000ppm Toxic Gases 0 1 up to 0 25 volume Accuracy Repeatability 2 of full range Toxic Gases 1 of full range O2 Response Time T90 30 seconds typical See Sensor Table Warranty Electronics 1 year Sensor See Table 3 Sensor Specific Data 9 1 2 Environmental Specifications Operating Temperature 409 to 50
17. a failure since there are 4 attempts before declaring failure This register can be cleared by writing a 0 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 this usage varies widely over time it will take some time to re adjust the battery life readings For instance 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 percentage is a value between 0 and 100 and battery life in minutes is an unsigned value between 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 if the user wanted to be notified a day before the battery needed to be changed the user could set a threshold in the controller to be notified of low battery after 1440 minutes 1 day Since 65535 is the maximum value for life remaining in minutes this represents a maximum of 45 5 days The battery life for an application can be much greater than this value and will remain at a readin
18. 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 to meet this timing NOTE Controllers that generate Modbus broadcast requests to the must ensure a 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 amp Description When the is assigned a Modbus address the following registers become available to the controller for access sensors implement this register set Some registers are Read Only 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 NOTE write to a Read Only register is allowed and returns a response but it does not change the value of the register In some devices this would return an exception code The following table is the register map for the CXT sensor and gives a brief description each register or register set This information is only meant as a reference The registers are divided into two sections one for CXT DM Instruction Manual Rev 1 5 Page 28 of 52 a detcon inc Model CXT DM
19. initial installation and commissioning close frequency tests should be performed weekly to monthly Test results should be recorded and reviewed to determine a suitable calibration interval Visual Inspection The Sensor should be inspected annually 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 DM Series Splashguard Adapter Assembly with integral filter P N 602 003552 100 for blockage of filter material e Inspect inside of the Junction Box for signs of water accumulation signs of corrosion Check wiring to ensure there are no loose or pinched wires and all connections are clean and tight Condensation Prevention Packet A moisture condensation packet 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 Detcon s PN is 960 202200 000 5 1 Replacement of the batteries battery pact 511 Units with 12V Smart Battery Pack The CXT DM 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
20. interference gases Table 4 Interfering Gases Acetaldehyde C2H30 Dimethyl Sulfide C2H6S Methane CHa Acetylene C2H2 Disilane CH30H Acrylonitrile C3H3N Epichlorohydrin Methyl ethyl ketone C4HgO Alcohols Alcohols Ethanol CH3SH Amines Amines Ethyl Mercaptan Nitric Oxide N Ammonia NH3 Ethylene itrogen No Arsenic Trifluoride AsF3 Ethylene Oxide Arsenic Pentafluoride 5 5 Fluorine Oz Arsine AsH3 Formaldehyde Boron Trifluoride Germane Bromine Hydrazine Phosphorous Trifluoride PF3 Butadiene C4He Hydrocarbons C H s Silane SiH4 Buten l Buten 1 _ unsaturated Si Carbon Dioxide Carbon Disulfide CS2 Hydrogen Bromide 502 Carbon Oxide Sulfide COS Hydrogen Chloride HCl C4 H8S Carbon Monoxide Hydrogen Cyanide C4H4S Carbonyl Sulfide CS Hydrogen Fluoride Cs H5CH3 Chlorine 1 Hydrogen Selenide WFe Chlorine Dioxide 1 Hydrogen Sulfide Chlorine Trifluoride CIF Dimethyl Sulfide CoH3Cl Diborane BoHe CXT DM Instruction Manual Rev 1 5 Page 44 of 52 a detcon ine Model CXT DM Table 5 Cross Interference Table
21. live gas reading and showing Bump until 2 minutes expires or the execution of a momentary hold over PGMI PGM2 when the display will scroll Bump Test Ended 3 4 5 Restore Defaults Restore Factory Defaults is used to clear current user configuration and calibration data from memory and revert to factory default values This may be required if the settings have been configured improperly and a known reference point needs to be re established to correct the problem This menu item appears as Restore Defaults CXT DM Instruction Manual Rev 1 5 Page 24 of 52 a detcon inc Model CXT DM NOTE Restoring factory defaults should only be used when absolutely necessary All previously existing configuration inputs will have to be re entered if this function is executed A full 10 second magnet hold on PGM 2 is required to execute this function From the Restore Defaults text scroll hold the programming magnet over PGM2 until the p prompt appears and continue to hold for 3 4 seconds The display will scroll Defaults Restored and 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 4 times and then return to Normal Operation Following the execution of Restore Defaults the CXT DM will revert to its factory default settings
22. n d LEL ajd nid ad n d 8 nd n d HBr n d n d n d n d n d n d n d n d n d n d n d n d HC n d n d ad n d n d nd nd ajd HCN n d n d n d n d 2 0 n d n d n d n d n d n d n d n d HF yes n d n d yes n d n d n d yesn d n d n d n d n d HS ajd 5 lt nid ad na nd 3 1 na CH30H n d n d n d n d n d n d 415 45 n d n d 415 200 415 200 n d 413 55 CH SH n d 1 4 5 lt 2 n d d n d nf d nd 21 ajd NO n d n d n d n d 5 0 n d n d n d n d n d n d n d n d NO n d n d n d n d n d n d n d n d n d 0 n d 10 015 2 0 ad n d n d n d n d n d n d n d n d 2 0 n d n d n d n d n d n d n d n d PH 1 4 10 56 n d ad n d n d nd nd SiH n d n a n d n d 2 0 n d n d n d n d n d n d n d n d 80 nd 1 4 n d ajd n d n d d 4 n d C4Hc0 n d n d n d n d 200 45 n d n d n a 200 200 n d 200 55 C HsCI n d n d n d n d n d n d 200 45 n d n d 200 200 n a n d 200 55 n a not applicable n d no data CXT DM Instruction Manual Rev 1 5 Page 49 of 52 a detcon Inc Model CXT DM 9 4 Spare Parts Sensor Accessories Calibration Equipment Part Number Spare Parts 92C 240200 000 CXT DM H2S Intelligent Transmitter Module 92C XX0200 YYY CXT DM Intelligent Transmitter Module for Toxic Gas Sensors where xx Gas Code and YY Y Range 371 XXXX00 XXX Replacement Plug in sensor Refer to Table 3 Senso
23. the CXT sensor and the other for the CXT transceiver For a more detailed description of the Register Map please contact Detcon CXT DM 100 Device Type Table 2 CXT DM Register Map Comment 36 Range Detectable Range Reading Current Gas Reading Calibration Level Auto Span Level Life Sensor Life Sensor Faults Fault bits Sensor Model DM set to 1 Days since Calibration Reserved Reserved Sensor Temperature DECIMAL e z Temperature Compensation Reserved COUNTS e z CONTROL Set during production test String Set during production test String Set during production test String Set during production test String Set during production test String Set during production test Reserved amp 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 Defaults to RF Channel Set in Display Modbus Address DIDID DID AAA 20 20 7 CXT Modbus Address Set in Display
24. to 90 15 to 90 15 to 90 15 to 90 10 to 95 15 to 90 20 to 95 The last three digits of the Part Number are the range of the sensor cell LE 100 is a 100ppm range CXT DM Instruction Manual Rev 1 5 Warranty 2 years 2 years 2 years 2 years 1 5 years 2 years 2 years 3 years 2 years 2 years 2 years 1 5 years 2 years 2 years 2 years 2 years 1 5 years 2 years 1 5 years Page 42 of 52 detcon inc Model CXT DM GasName Hydrazine Hydrogen Hydrogen Hydrogen Bromide Methanol Methyl Mercaptan Nitric Oxide Nitrogen Sulfur Dioxide E 71131300 4030 9040 2 2 years 371 333800010 T90 lt 90 2 4 201035 100080 15 years 371 555500 020 T90 20 lt 2 signal 20 10 50 2 years loss month 5 5 5 2 The last three digits of the Part Number range of the sensor cell LE 100 is 100ppm range CXT DM Instruction Manual Rev 1 5 Page 43 of 52 a detcon Inc Model CXT DM 9 3 Interference Table Refer to Table 4 Interfering Gases to match the interfering gas symbol with the gas name Then refer to Table 5 Cross Interference Table which extends for 5 pages with each sensor specific gas repeated in each section of the table for a column listing of 40 gases The list is followed by a row of 14 possible interfering gases per page Review each page for the applicable sensor gas and then scan across the row for possible
25. 1 to decrease the AutoSpan Level until the correct level is displayed When the correct level is achieved hold the magnet over PGM2 for 3 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 4 4 Bump Test Bump Test is used to check the response of the sensor with the indication of response limited to the display only The Bump Test mode allows the performance of the sensor to be checked without firing the alarms of any attached control systems 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 PGMI PGM2 until the p prompt appears and continue to hold the magnet in place for an additional 3 4 seconds until the display starts to scroll Bump Test Started Apply span gas to the sensor according to Section 2 6 1 Toxic Gas Sensors The Sensor will respond to the gas to test the sensor response but the Modbus current gas reading Modbus register 0002 will remain unchanged Remove the gas before the Bump Test time expires 2 minutes The display will return to normal operation and alternate between the
26. 3 1 2 3 MP Appi i m m Bump Test Started CP App ne S inc PGM S PGM1 2 3 PGM1 S dec S dec 2 minute timeout PGM1 2 CRF App SERE ee mee RF SW Modbus ID Auto Time Out AutoTime out Auto Time Out PGM1 2 M 1 2 1 2 PGM1 2 3 I PGM1 2 3 PGM1 2 3 Serial N Defaults Restored m Ht 528 penus RF Channel frig eae PGM2 5 inc 4 2 5 1 S 1 5 E I LEGEND PGMI 2 3 PGMI 2 3 Network ID 1 Program Switch Location 1 Program Switch Location 2 Range 5 Momentary Swipe M Momentary hold of Magnet during text Autospan Level scroll until the gt appears then release 3 3 second hold from gt prompt 10 10 second hold from gt prompt Tempcomp Level Auto Time out 5 seconds inc Increase Last Cal Days dec Decrease HH HHH numeric values Sensor Life Temperature Figure 16 Software flow chart 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 range and gas type i e ppm H2S If the sensor is actively experiencing any diagnosti
27. He sendy c 25 34 71 Set Modbus ID cce red t e ri ee eee ie meet de ce readies 25 3 5 Fault Diagnostic Failsafe 26 4 Modbus Communications reir eo e ERU D Re e Ee a ee e toe eges 27 41 General Modbus Description ooo ee ette eei eite ette ere eo etis ede aed 27 Modbus Exceptions ertet eret hereto ple eee 27 4 1 2 Modbus Broadcast 28 4 2 Modbus Register 4 28 421 CXF Sensor Reglsters ie a gene tba do hee hs tte t Eq Here ible 30 4 2 2 Transceiver Registers tede ee e e eee tette est eene bete te E enki Eee gea 31 service and Maintenances epit dp gute eet eee eere Pee 33 5 1 Replacement of the batteries battery pact essere nennen nennen 33 5 1 1 Units with 12V Smart Battery 33 5 1 2 Units with Tri sized Lithium Battery 33 5 2 Replacement of Plug in Sensot idet e e e Ce deir Rete ee ER E ot can 34 5 3 Replacement of ITM Aluminum J Box eene nennen 35 5 4 Replacement of ITM Stainless Steel Mini Condulet eese 36 6 Troubleshooting Guide eee eU pre lee Hera degere e 37 7 Custo
28. M sensor utilizes a transceiver radio based upon the IEEE 802 15 4 standard The transceiver operates at 2 4 GHz using DSSS encoding for robustness DSSS was initially used by the military to resist jamming but later was widely adopted for wireless implementations since it was robust in noisy environments 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 NOTE If there are multiple Modbus networks in the same vicinity each system must reside on a different RF Channel to keep data from one appearing on the other The 802 15 4 standard also implements a mesh network allowing any CXT DM transceiver to relay or repeat data between adjacent neighbors This makes the network very robust and provides the following immediate benefits Allows re routing of data in case of loss of a transceiver Allows re routing around wireless obstacles Longer distances between transceivers because data can hop from one transceiver to the next Included in sensor controller and alarm s
29. ad 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 Re install the battery holder in the J box and re install the batteries into the housing Replace the battery holder cover Check and or perform Zero Calibration and Span Calibration per sections 3 3 Calibration CXT DM Instruction Manual Rev 1 5 Page 36 of 52 a detcon inc Model CXT DM 6 Troubleshooting Guide If the ITM detects any functional errors the ITM 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 4 or p prompt will appear The Display Error Codes are Auto Span Fault Temperature Fault Memory Fault Processor Fault Clearing Fault Range Fault Sensor Fault Zero Fault Sensor Fault 2 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 Under Range problems Probable Cause Sensor Baselin
30. 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 external ground lug Verify a good ground connection between the junction box and earth ground 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 Do not substitute components Substitution of components may impair the intrinsic safety rating Do not operate the sensor outside of the stated operating temperature limits Do not operate the sensor outside the stated operating limits for voltage supply These sensors meet ATEX standards EN60079 0 2012 EN60079 1 2007 and EN60079 11 2012 These sensors have a maximum safe location voltage of Um 30V These sensors pass dielectric strength of 500V RMS between circuit and enclosure for a minimum of 1 minute at a maximum test current of 5 The CXT DM may be used as an oxygen deficiency sensor the CXT DM must not be used for detecting oxygen concentrations expected to be greater than 21 The CXT DM must only use gas sensor cell model 371 xxxx00 yyy No other gas sensor shall be used The CXT DM is only to be used with Detcon P N 360 026500 000 batteries Tadiran Model TL 5920 The battery holder utilizes three of these batteries in series to operate the sensor
31. apsulated in an Explosion proof housing Figure 4 Sensor Assembly Breakaway NOTE All metal components are constructed from electro polished 316 Stainless Steel in order to maximize corrosion resistance in harsh environments 121 CXT DM Intelligent Transmitter Module The Transmitter Module is a microprocessor based package that is attached to the explosion proof junction box Circuit functions include an intrinsically safe barrier on board power supply microprocessor magnetic programming switches and a linear 4 20mA DC output Magnetic program switches located on either side of the ITM are activated via a hand held magnetic programming tool thus allowing non intrusive operator interface with the Transmitter Module Electrical classifications are Class I Div 1 Groups B C and D Accessory connections Antenna Power In Figure 5 Functional Block Diagram 1 2 2 Field Replaceable Sensor The Detcon family of electrochemical gas sensor is 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 Detcon s family of toxic sensors has a long shelf life and is supported by an industry leading warranty Figure 6 Plug in Sensor CXT DM Instruction Manual Rev 1 5 Page 3 of 52 a detcon Inc Model CXT DM 13 CXT Wireless Network The CXT D
32. ayed Hold the magnet over PGM2 for 3 4 seconds to accept the new value The display will scroll ID Saved and revert to Set Modbus ID 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 Serial ID 5 times and then return to Normal Operation 3 5 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 6 Troubleshooting Guide CXT DM Instruction Manual Rev 1 5 Page 26 of 52 a detcon inc Model CXT DM 4 Modbus 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 Sensor to obtain readings and status of the sensor As with normal Modbus operation there can be only one Modbus master that polls all the other
33. 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 Function Code 03 03h Read Holding Registers Function Code 06 06h Write Single Register 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 411 Modbus Exceptions 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 See Section 4 2 2 4 Register Control The following exception codes are supported and returned when Modbus exceptions are enabled CXT DM Instruction Manual Rev 1 5 Page 27 of 52 a detcon Inc Model CXT DM Table 1 Exception Codes Ed Name Meaning 01 Function Unsupported function code Only 03 06 and 16 are supported Invalid register address detected If any request for registers 02 Illegal Data Address outside of the valid register address for the CXT oc
34. c faults a swipe of the magnet will cause the display to scroll the fault condition Refer to Section 5 Service and Maintenance for more information on fault conditions 3 3 Calibration Mode CXT DM Instruction Manual Rev 1 5 Page 18 of 52 a Model CXT DM detcon inc 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 5046 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 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 toxic 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 cylinder should be used Pure must be used for zero calibration of the defic
35. ccessories 897 850800 010 NEMA 7 Aluminum Condulet Base 897 850400 010 NEMA 7 Aluminum Condulet Solid Cover 897 850500 010 NEMA 7 Aluminum Condulet w Window Cover 897 860401 316 316SS Mini Condulet Extended Cover 897 860800 316 316SS Mini Condulet base 960 202200 000 Condensation prevention packet For condulet replace annually 943 004365 000 Wireless Sensor Mounting Plate for use with Standard Al condulet 500 005 180 100 CXT Smart Battery Terminal Board 303 73423 1 000 Insertion tool CAGE Clamp Connector CXT DM Instruction Manual Rev 1 5 Page 50 of 52 a detcon inc Model CXT DM 9 5 Revision Log Revision Date Changes made Approval 0 0 03 31 12 Release LU 0 1 12 04 12 Adding note requiring removal of sensor assembly to non BM hazardous location to install or replace batteries 1 2 2 21 13 Updated spare parts list drawings LBU 1 3 9 30 13 Added section 2 1 Hazardous Location Guidelines BM 1 4 01 20 14 Add Calibration Wind Guard to Calibration Procedures BM 1 5 02 10 14 Add detail to battery installation BM CXT DM Instruction Manual Rev 1 5 Page 51 of 52 LI detcon Inc Model CXT DM This page left intentionally blank Shipping Address 4055 Technology Forest Suite 100 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 w
36. ce in similar processes 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 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 thought toward selecting sensor location is combining leak source and perimeter protection in the best possible configuration Maintenance Access Consideration should be given to providing easy access for maintenance personnel Consideration should also be given to the consequences of close proximity to contaminants that may foul the sensor prematurely NOTE In all installations the gas sensor should point straight down refer to Figure 11 Improper sensor orientation may result in false readings and permanent sensor damage Placement of RF Antenna Placement of the sensor should also 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 Additional Placement Considerations The sensor should not be positioned where it may be sprayed or coated with surface contaminating sub
37. chemical Toxic Sensor eese ene 2 Figure Construction of Galvanic nennen rennen nest nennen nentes 2 Figure 4 Sensor Assembly Breakaway sese ene tenetnneennrenr entrent 3 Figure 5 Functional Block 0 40022 nennen nennen netten rennen entes 3 Figure 6 Plug in SENSOT iiti iet ete Eb e E eot eL eL e ale s Mo 3 7 Simart Battery Pack qm 5 Pipure 8 Quad Battery Charger etn ueteri ortae ede E a EE Aaa a RE aa 5 Figure 9 Tri C Lithium Battery Holder esee eene nennen nennen nennen enne entente 6 10 Approyal aei a et EA 7 Figure 11 CXT DM Sensor with Smart Battery Pack Mounting Dimensions 10 Figure 12 CXT DM Sensor with Lithium Battery 2 11 Figure 13 Terminal Interconnect for Smart Battery 13 Figure 14 Magnetic Programming Tool lae eee beer tee betae eec ean bete Rod esa pe 16 Figure 15 Magnetic Programming 5 16 Eipure 16 Software ow Chart ieo dee eb ect eei debe e ERE 18 Figure 17 Modbus Frame entes ernst
38. crease or PGM1 to decrease the hexadecimal number until the desired ID is displayed Hold the magnet over PGM2 for 3 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 5 times and then return to Normal Operation 3 4 7 Set Modbus ID Detcon sensor can be polled serially via Modbus Refer to Section 4 0 for details on using the Modbus output feature Set Modbus ID is used to set the Modbus address of the unit It is adjustable from 01 to 256 in hexadecimal format 01 FF hex Each sensor must have a unique Modbus address to operate correctly on the network The current serial ID can be viewed in View Sensor Status CXT DM Instruction Manual Rev 1 5 Page 25 of 52 detcon Inc Model CXT DM The menu item appears Set Serial ID From the Set Modbus ID text scroll hold the programming magnet over PGM1 or PGM2 until the p prompt appears and continue to hold the magnet in place for an additional 3 4 seconds until the display starts to scroll ID The display will then switch to where XX is the current ID address Swipe the magnet momentarily over PGM2 to increase or to decrease the hexadecimal number until the desired ID is displ
39. ction code 06 to register 8202 with the number of seconds the network should go into low power mode During 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 to it The Modbus interface remains active only the wireless network is placed in a low power state The value of this register can be between 0 and 65535 which allows a maximum low power time of 18 2 hours Removal of power will reset Update Rate to 0 and the transceiver will be active again 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 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 reserved bits should always be set to a 0 when writing The listing below shows the bit assignments Bit 15 Reserved set to 0 Bit 14 Reserved set to 0 Bit 13
40. current reading for about 2 seconds and will return to a blank display to conserve battery power CXT DM Instruction Manual Rev 1 5 Page 13 of 52 a detcon inc Model CXT DM 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 Material Requirements e Detcon PN 613 120000 700 700 Series Splash Guard with integral Cal Port and Calibration Wind Guard P N 943 000000 000 OR e Detcon PN 943 000006 132 Threaded Calibration Adapter e Detcon P N 943 01747 T05 Teflon Calibration Adapter for highly reactive gases e Detcon Span Gas 50 of range target gas in balance N or Air at fixed flow rate between 200 500cc min NOTE Calibration gas generators using perm tubes or electrochemical sources may be used in place of span gas cylinders NOTE Wind Guard must be used when calibrating with the integral cal port to ensure proper calibration 1 Attach the calibration adapter to the Splashguard Adapter Assembly or connect tubing to integral cal port It is recommended that the Wind Guard Detcon P N 943 000000 000 is installed over the Splash Guard during calibration 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 2 Remove test gas and observe that the display decreases t
41. curs this exception code will be returned There are other exception codes defined in Modbus but these are the only ones used by the NOTE When using Detcon controllers Modbus exceptions should be turned off 41 2 Modbus Broadcast Requests The Modbus broadcast request was introduced in the to support commands to be executed across all CXT transceivers simultaneously More specifically 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 sensor will continue to operate normally If none of are battery powered then there is no need to issue a command to place the transceivers in low power mode According to the Modbus specification a broadcast request is defined as a request with the Address Field set to 0 and is used for writing only 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 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 This is defined as the turnaround delay This turnaround delay should be approximately 150 milliseconds for
42. devices on the network which are considered Modbus slaves Each sensor must have a unique Modbus address to work properly on the wireless network Also each device on the wireless network must be on the same RF channel to communicate with one another 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 Modbus transactions consist of both a request
43. dulet This option offers a smaller foot print but provides less run time than Detcon s Smart Battery Pack The CXT CXT DM Instruction Manual Rev 1 5 Page 5 of 52 detcon Inc Model CXT DM 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 Lithium Battery Holder CXT DM Instruction Manual Rev 1 5 Page 6 of 52 a detcon inc Model CXT DM 2 2 1 1 10 11 12 13 Installation Hazardous Locations Installation Guidelines for Safe Use Install the sensor only in areas with classifications matching the approval label Follow all warnings listed on the label MODEL CXT DM DETCON THE WOODLANDS TEXAS 77381 USA CXT DM PN 96C XX0202 YYY GLASS D DIV 1 GROUPS C amp D ZONE 1 GROUP DE ___ CAUTION READ INSTRUCTION MANUAL RF ID WARNINGS SUBSTITUTION OF COMPONENTS n MAY IMPAIR INTRINSIC SAFETY REPLACE RATED 7 2 11VDC 50 BATTERIES IN NON HAZARDOUS AREA DO NOT I NACE E N I EC BARA 1034 S WIPING PLASTIC WITH DAMP CLOTH Figure 10 Approval Label 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 A good ground connection should be verified between the sensor s metal enclosure
44. e battery holder 5 Replace the batteries with the same type Detcon PN 360 026500 000 It is permissible to use only Tadiran Model TL 5920 batteries Do NOT use regular C size batteries as this may cause damage to the sensor assembly 6 All three batteries must be replaced at the same time 7 Pay attention to the orientation of the batteries when installing batteries in the Battery Holder The negative minus leads of the battery should connect with the negative minus leads of the battery holder The positive plus leads of the batteries should connect with the positive plus leads of the battery holder 746 Release Screws to allow access to remove replace batteries Positive connections to batteries have raised bump iB 1 ithium Batteries Negative connections to batteries have coiled spring Figure 18 Battery Orientation Diagram 8 Reattach the battery cover using screws 9 Re install Tri C Battery Holder in Enclosure Base pressing down and rotating clockwise to secure The Battery Holder will Snap into position when correctly oriented 10 Replace the cover on the J box 5 Replacement of Plug in Sensor NOTE It is not necessary to remove power while changing the plug in toxic gas sensor in order to maintain area classification since it is intrinsically safe CXT DM Instruction Manual Rev 1 5 Page 34 of 52 detcon inc NOTE Only replace the plug in sensor w
45. e drifted lower Interference gases e Perform Zero Calibration Use Zero Air or N source Section3 3 1 AutoZero e Allow more time for zero stabilization if this is a biased sensor type e Execute successful Span Calibration Section 3 3 2 AutoSpan e Replace plug in toxic sensor if error continues 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 e If using Splashguard with Integral Cal Port must use Calibration Wind Guard or air movement can compromise span gas delivery e Check for obstructions affecting cal gas hitting sensor face including being wet blocked or corroded H2S sensors assemblies use CXT DM Series Splashguard Adapter Assembly with integral filter Clean or replace if necessary e Replace the plug in toxic sensor 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 5 of range in lt 5 min after Span calibration is complete Use bottled air zero air if there is a known continuous background level Check validity of span gas using pull tube or other means check MFG date on cal gas cylinder Use proper cal gas regulators and tubin
46. e top section of the ITM and unthread the ITM until it can be removed 3 Use a 1 8 Allen wrench to release the locking cap head screw that locks the ITM and Splashguard Adapter Assembly together One turn will suffice Do not remove setscrew completely 4 Unthread and remove the Splashguard Adapter Assembly and Splash Guard from the ITM These will be re used with the new ITM 5 Gently remove the plug in toxic gas sensor from the old ITM and install it in the new ITM Orient the plug in sensor pins so that they matches the female connector pins on the new ITM and press the sensor in firmly to make proper connection 6 Thread the Splashguard Adapter Assembly onto the new ITM until snug tighten the locking cap head screw and reinstall Splash Guard CXT DM Instruction Manual Rev 1 5 Page 35 of 52 detcon inc Model CXT DM 99 5 4 Feed the sensor assembly wires and cable through the 34 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 terminal board inside the Junction Box Re connect the RF cable to the antenna cable Re install the battery pack Check and or perform Zero Calibration and Span Calibration per sections 3 3 Calibration Replacement of ITM Stainless Steel Mini Condulet Remove the cover of the battery holder and remove the batteries R
47. emove 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 10 11 to maintain area classification 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 section of the ITM and unthread the ITM until it can be removed Use a 1 8 Allen wrench to release the locking cap head screw that locks the ITM and Splashguard Adapter Assembly together One turn will suffice Do not remove setscrew completely Unthread and remove the Splashguard Adapter Assembly and Splash Guard from the ITM These will be re used with the new ITM Gently remove the plug in toxic gas sensor from the old ITM and install it in the new ITM Orient the plug in sensor pins so that they match the female connector pins on the new ITM and 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 Splash Guard Feed the sensor assembly wires and RF cable through the 34 female NPT port and thre
48. ervice 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 Warranty Notice Detcon Inc warrants the Model CXT DM 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 8 CXT DM Sensor Warranty 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 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
49. es for Safe 7 2 2 MM amp 2 3 Sensor Contaminants Interference 044000000 9 2 4 Sensor MUNNS 2 GU e RED eee y e Hee bo ttp eee 9 2 5 Electrical Inst llation 4 tee eee nemo Dee ena epe ee eere 11 2 6 Initial Start Ups eoe Re e RR RR E UR ee ELA 13 2 6 1 Toxic Gas Sensi Snn rere uet a er e Re epe ee Ege seat pe rie 13 2 6 2 Qj Deficiency Sensors nece iet e eei ege ects abs vete Hd RE Reda 14 S NMEE GUNT 16 3 1 Operator ntetrf ce sna ERU UR eget coe P e oue ge 17 3 2 Normal Operation tis gebe as Cte e o et ate de ean 18 3 3 Calibration Mode 4 5 er eei e ett eie ig EET sb etos vea 18 SES Minor C UT 19 9 912 AUTOS Dal cete icr vent eit onse rA Ea t E HERE ree AER PNE 20 3 4 Program Mode te bet p pe er ete d cle ie o 22 35 441 View Sensor Status eL EUR ene LEHRER WA ion e 22 34 2 Set Detection Range een Gates ERE Uode et red 23 3 43 Sec Autospan Level os ene eer RR RR eas deen ORI Ren 24 ei tee eoe eer EE PE ere eet ede ods ede ete eie ta 24 252 Restore Betaults i e cte be tee Het be ode Ht eee eel etre lone c aab 24 3 4 6 Set RF Channel suene ere e eia ertt
50. et over PGMI for 3 seconds once the 4 prompt appears to execute AutoZero or allow to timeout in 5 seconds if AutoZero is not desired NOTE Upon entering Calibration Mode the Modbus Status Register bit 14 is set to signify the 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 CXT DM Instruction Manual Rev 1 5 Page 19 of 52 a detcon inc Model CXT DM 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 NOTE Before performing AutoSpan Calibration verify that the AutoSpan level matches the span calibration gas concentration as described in Section 3 4 3 Set Autospan Level Material Requirements Detcon PN 327 000000 000 MicroSafe Programming Magnet e Detcon Splash Guard with integral Cal Port PN 613 120000 700 and Calibration Wind Guard PN 613 120000 700 OR Detcon PN 943 000006 132 Threaded Calibration Adapter e Detcon Span Gas See De
51. fic Data Part Number 371 343400 025 371 12EA00 100 371 12 00 100 371 171700 100 371 191900 001 371 747500 005 371 12 00 100 371 444400 100 371 747400 010 371 777700 001 371 282800 050 371 192100 005 371 122000 100 371 24EZ00 100 371 12ED00 100 371 12EJ00 100 371 272700 001 371 12EP00 100 371 232500 002 Response Time seconds T95 lt 30 T90 lt 140 T90 lt 140 T90 lt 90 T90 lt 60 T90 lt 60 T90 lt 140 T90 30 T90 lt 60 T90 lt 60 T90 lt 120 T90 lt 60 T90 lt 140 T90 lt 45 T90 lt 140 T90 lt 140 T90 lt 80 T90 lt 140 T90 lt 60 SpanDrift lt 5 signal loss year lt 5 signal loss year lt 5 signal loss year lt 2 signal loss month lt 5 signal loss month lt 2 signal loss month lt 5 signal loss year lt 5 signal loss year lt 2 signal loss month lt 2 signal loss month lt 1 signal loss month lt 5 signal loss month lt 5 signal loss year lt 2 signal loss month lt 5 signal loss year lt 5 signal loss year lt 5 signal loss year lt 5 signal loss year lt 1 signal loss month Temperature Range C 20 to 50 20 to 50 20 to 50 20 to 50 20 to 40 20 to 50 20 to 50 40 to 50 20 to 50 20 to 50 20 to 40 20 to 40 20 to 50 40 to 50 20 to 50 20 to 50 10 to 40 20 to 50 20 to 40 Humidity Range 15 to 90 15 to 90 15 to 90 15 to 90 20 to 95 15 to 90 15 to 90 15 to 90 15 to 90 15 to 90 10 to 95 20 to 95 15
52. g for highly corrosive gases Check for obstructions affecting cal gas hitting sensor face including being wet blocked or corroded 25 sensors assemblies use CXT DM Series Splashguard Adapter Assembly with integral filter Clean or replace if necessary CXT DM Instruction Manual Rev 1 5 Page 37 of 52 detcon Inc Model CXT DM e Replace the plug in toxic sensor Poor Calibration Repeatability Probable Causes Failed Sensor use of wrong Cal Gas or problems w 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 HCI C12 NH3 HBR F2 etc e Check for obstructions affecting cal gas hitting sensor face including being wet blocked or corroded H2S sensors assemblies use CXT DM Series Splashguard Adapter Assembly with integral filter Clean or replace if necessary e Replace the plug in toxic sensor 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 Protection Circuit accessory if problem is proven RFI induced Nuisance Alarms Check condulet for accumulated water and abnormal corrosion
53. g of 65535 until it drops below this Life in percentage was added for this reason Percentage will track starting at 100 percent and drop down as 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 0 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 CXT DM Instruction Manual Rev 1 5 Page 31 of 52 LI detcon Inc Model CXT DM write fun
54. 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 The safety approvals require removing entire sensor assembly to a non hazardous area NOTE before installing or changing out the batteries or battery pack 1 Remove the cover from the J box 2 Unscrew battery bracket lid and swing the lid away from the battery pack 3 Remove the battery pack from the J box and replace with new battery pack 4 Swing the lid back over the battery pack and re tighten screws in battery bracket lid 5 Replace the cover on the J box 51 2 Units with Tri sized Lithium Battery Holder The safety approvals require removing entire sensor assembly to a non hazardous area ROTE before installing or changing out the batteries or battery pack Remove the cover from the J box CXT DM Instruction Manual Rev 1 5 Page 33 of 52 detcon Inc Model CXT DM 2 Press Tri C Battery Holder down slightly 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 screws on the battery holder The screws are captive screws removal of the screws is not necessary 4 The orientation of batteries is marked on the inside of the cover and the holder Remove the batteries from th
55. iency sensors Material Requirements Detcon PN 327 000000 000 MicroSafe Programming Magnet Detcon PN 613 120000 700 Splash Guard with integral Cal Port and with Wind Guard OR Detcon PN 943 000006 132 Threaded Calibration Adapter Detcon PN 942 001123 000 Zero Air cal gas or use ambient air if no target gas is present Detcon P N 942 640023 100 Nitrogen 99 99 NOTE zero gas source may be zero air for toxic sensors but must be 99 99 for deficiency sensors NOTE The Calibration Wind Guard must be used when the Splashguard Adapter with integral Cal Port is used Failure to use the Calibration Wind Guard may result in an inaccurate AutoZero calibration a For toxic 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 1 2 minutes before executing the AutoZero For deficiency sensors apply at a set flow rate of 500cc min for 3 5 minutes before executing AutoZero b From Normal Operation enter Calibration Mode by holding the programming magnet over PGMI for 3 seconds Note the p prompt will show that the magnetic switch is activated during the 3 second hold period The display will then scroll Pgm1 Zero Pgm2 Span Hold the programming magn
56. ill remain set until the program returns to normal operation Apply the span calibration test gas for toxic 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 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 for 1 minute NOTE Ambient air should be used to calibrate deficiency sensors as long as the oxygen concentration is confirmed to be 20 9 There is no need to apply a flow of gas Assuming acceptable 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 d 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 repo
57. ion gas level setting 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 100 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 through below for AutoSpan calibration CXT DM Instruction Manual Rev 1 5 Page 20 of 52 detcon ine Model CXT DM a b Verify that the AutoSpan Level is equal to the Calibration Span Gas Concentration Refer to View Sensor Status in Section 3 4 1 If the AutoSpan Level is not equal to the Calibration span gas concentration adjust the AutoSpan Level as instructed in Section 3 3 2 AutoSpan From Normal Operation enter Calibration Mode by holding the programming magnet over PGMI for 3 seconds Note the p prompt will show that the magnetic switch is activated during the 3 second hold period The display will then scroll PGM1 Zero 2 5 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 ppm Gas NOTE Upon entering Calibration Mode the Modbus Status Register bit 14 is set to signify the sensor is in calibration mode This bit w
58. ion the 4 prompt will not appear until the fault s have been displayed The ITM will enter Program Mode and the display will display 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 s text is scrolling At the conclusion of the text scroll the arrow prompt 4 for PGM2 or 4 for PGMI 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 or PGM2 while the menu item is scrolling At the conclusion of the text scroll the prompt 4 for PGM2 or for PGMI will appear continue to hold the magnet over or PGM2 for an additional 3 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 3 4 1 View Sensor Status View Sensor Status displays all current configuration and operational parameters including sensor type software version number gas type detection range AutoSpan level days since last AutoSpan estimated remaining sensor life raw sensor current mA output input voltage and sensor ambient temperature From the View Sensor Status text
59. itches 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 Concentration Reading is displayed once every 10 seconds Calibration Mode AutoZero AutoSpan Program Mode View Sensor Status Mp App CP App Rf App Rf Sw Modbus ID Serial Number RF Channel Network ID Range Autospan Level Tempcomp Level Last Cal Days Sensor Life Temperature C Set Detection Range Set Autospan Level Bump Test Set RF Channel Set Modbus ID CXT DM Instruction Manual Rev 1 5 Page 17 of 52 detcon Inc Software Flowchart Normal Operation i i i POMI TT 3 m 2 10 GME 3 Auto Time Out 1 2 pp 1779 Set Autospan Level r BumpTest _ PGM1 2 3 AutoTime out Auto Time Out ry Auto Time Out PGM1 2 PGM1 2 M PGM1 2 M i PGM1 2 3 PGM1 2
60. ith an authorized family of gas sensors Locking Setscrew ITM Bottom View Locking Setscrew Plug in Sensor Bottom view Figure 19 Sensor Cell and ITM Mating 1 Use 1 16 Allen wrench to release the locking setscrew that locks the ITM and Splashguard Adapter Assembly together One turn will suffice Do not remove setscrew completely 2 Remove splashguard Unthread and remove the Splashguard Adapter Assembly from the ITM 3 Gently pull the plug in sensor out of the ITM Verify the gas type and range of the new sensor cell is correct 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 4 Thread the Splashguard Adapter Assembly onto the ITM to a snug fit and tighten the locking setscrew using the 1 16 Allen wrench Reinstall the splashguard 5 Check and perform zero calibration and span calibration as per Section 3 3 Calibration 5 3 Replacement of ITM Aluminum J Box 1 Remove the power source to the sensor assembly and remove the battery pack from the J box 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 2 Use a wrench and the wrench flats provided at th
61. m 0 25ppm 0 50ppm and 0 100ppm Ranges for deficiency are 0 196 up to 0 25 by volume basic sensor assembly consists of an electrochemical sensor mounted in Intrinsically Safe stainless steel housing and includes a Splash Guard Cal Adapter Optionally the sensor can be installed on an explosion proof junction box with a choice of battery pack options making operation fully independent of outside cabling Other options are available contact Detcon for more information gos isi Figure 1 Sensor Assembly with Optional J Box and Smart Rechargeable Battery Pack Electrochemical Sensor Technology The Toxic gas sensors are based on electrochemical cells Each cell consists of three electrodes embedded in an electrolyte solution all housed beneath a diffusion membrane Sensitivity to specific target gases is achieved by varying composition of any combination of the sensor components Good specificity is achieved in each sensor type The cells are diffusion limited via small capillary barriers resulting in a long service life of up to three or more years The electrochemical cell is packaged as a field replaceable plug in sensor CXT DM Instruction Manual Rev 1 5 Page 1 of 52 detcon Inc Model CXT DM Diffusion Barrier e Reference Electrode Counter Electrode Electrolyte Reservoir Figure 2 Construction of Electrochemical Toxic Sensor
62. mer Support and Service Policy sese enne enr nennen nennen 39 82 CXI DM Sersor Warranty en Rate EP ep rre Me bte Eea 40 9 JADpendbx reet eret er ete e ER E A e Le eu erede 41 Model CXT DM iii ine 9 1 Specifications eye 41 O System tet e DOS ML ede Fea evene eda 41 9 1 2 Environmental Specifications sessi enne tenente 41 9 1 3 Electrical amp rennen enne 41 91 4 Mechanical 1 etae rnit tis sees n EE TIE 20 5 42 9 2 Sensor Specific Data 42 9 3 Interference Table 5 nere tet Eh Eres EE Heec LEER LES de Eo d 44 9 4 Spare Parts Sensor Accessories Calibration Equipment eee 50 9 5 REVISION 51 Table of Figures Figure 1 Sensor Assembly with Optional J Box and Smart Rechargeable Battery Pack 1 Figure 2 Construction of Electro
63. n d n d n d n d n d n d n d 330 170 n d n d n d n d n d n d 100 lt 1 n d n d 02 014 n d n d n d n d n d n d n d 1000 0 n d 200 0 04 n d n d 0 1 0 1 n d n d n d n d ppm n d n d n d n d n d n d n d n d n d n d n d n d n d LEL n d n d n d n d n d 100 0 n d n d n d n d n d n d n d HBr n d n d n d 1000 0 no n d n d n d 0 1 0 3 4 4 n d n d n d n d n d 1000 0 no n d n d n d 0 1 0 3 4 4 n d n d HCN n d n d n d 1000 0 n d n d n d n d 0 120 n d yes n d n d n d HF n d n d n d 1000 0 n d n d yesn d yesn d 0 1 0 yesn d n d n d n d HS n d n d n d n d n d n d n d n d n d n d n d n d n d 415 40 415 340 415 75 n d 4 n d n d n d n d n d n d 415 170 n d CH3SH n d n d n d n d n d n d n d n d n d n d n d 275 170 n d NO n d n d n d n d n d n d n d n d n d n d n d n d n d NO2 n d n d n d n d n d n d n d n d n d n d n d n d n d 0 n d n d n d n d n d n d n d n d 01 005 n d yesn d n d n d n d n d n d 1000 0 n d 50 0 5 n d n d n d n d n d n d n d PH n d n d n d n d n d 100 0 01 n d n d 141 4 4 n d n d SiH n d n d n d n d n d 100 lt 1 n d n d 02 014 n d n d n d n d S02 n d n d n d n d n d n d n d n d n d n d n d n d n d C4H602 200 40 200 340 200 75 n d n d n d n d n d n d n d n d 200 170 n d C2H C1 200 40 200 340 200 75 n d n d n d n d n d n d n d n d 200 170 n d n a not applicable n d
64. ng brackets for Detcon Junction Boxes are available separately CXT DM Instruction Manual Rev 1 5 Page 9 of 52 a detcon inc Model CXT DM 8 32 tapped ground point 74 mounting holes 23 Typ ITM Assemb Splash Guard A Y Figure 11 CXT DM Sensor with Smart Battery Pack Mounting Dimensions CXT DM Instruction Manual 9 5 Rev Splash Guard Use spacers to move sensor assembly away from wall at least 0 5 34 NPT Port dapter N 1 5 7 45 mounting surface Page 10 of 52 deteon ine Model CXT DM 34 Port 22 3 45 Mini Condulet with Battery Holder and mounting holes Batteries 6 32 tapped ground point ITM Assembly LL Figure 12 CXT DM Sensor with Lithium Battery Pack ir Splash Guard Adapter Splash Guard 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 CXT DM Instruction Manual Rev 1 5 Page 11 of 52 a detcon Inc Model CXT DM 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 exis
65. no data CXT DM Instruction Manual Rev 1 5 Page 45 of 52 a detcon inc Model CXT DM Table 5 Cross Interference Table pg 2 Gas C0 CS2 co cos CL CLO CLF B2H6 C2H6S CsHsOCL C2H50H Fa C2H30 n d 40 140 40 100 40 135 n d n d n d n d 40 150 n d 40 50 40 180 n d C2H2 n d 340 140 340 100 340 135 n d n d n d n d 340 150 n d 340 50 340 180 n d n d 75 140 75 100 75 135 n d n d n d n d 75 190 n d 79 50 75 180 n d NHs n d n d 300 8 n d 1 1 10 15 n d n d n d n d n d n d n d 5 5000 0 n d 300 0 n d 05 0 04 n d n d 02 015 n d 5 yesn d n d n d n d Bra n d n d 300 0 n d 1 2 1 6 n d n d n d n d n d n d n d C4H6 n d 170 140 170 100 170 135 n d n d n d n d 170 150 n d 170 50 170 180 n d CS2 n d n a 140 100 140 135 n d n d n d n d 140 150 n d 140 50 140 180 n d CO n d n d n a n d 1 0 n d n d n d n d n d n d 200 0 n d Clo n d n d 300 0 n d n a n d n d n d n d n d n d n d n d 10 gt 10ppm n d n d 300 0 n d 3 n a n d n d n d n d n d n d n d 10 10ppm 5000 n d 1000 0 n d 1 0 9 n a yesn d 0 1 0 n d n d n d n d yesn d B2H6 5000 n d 300 0 n d 05 0 05 n d n d n a n d yesn d n d n d n d CsHs0C1 n d 50 140
66. o 0 3 If a calibration adapter was used during these tests remove them from the unit and re install the Splash Guard If the wind guard was used remove the wind guard Initial operational tests are complete CXT DM toxic 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 zero and span calibration instructions in Section 3 3 Calibration 2 6 2 O2 Deficiency Sensors a When first powered up the CXT DM display should read close to 20 9 b The reading should stabilize within 1 to 2 minutes of power up assuming a normal ambient concentration Initial Operational Tests After a warm up period of 5 minutes the sensor should be checked to verify response to deficiency Material Requirements e Detcon PN 613 120000 700 700 Series Splash Guard with integral Cal Port and with Wind Guard OR e Detcon PN 943 000006 132 Threaded Calibration Adapter e Detcon Zero Gas 100 N2 at fixed flow rate of 200 500cc min CXT DM Instruction Manual Rev 1 5 Page 14 of 52 a deteon ine Model CXT DM a Attach the calibration adapter to the threaded sensor housing or connect tubing to the integral cal port Apply the test gas at a controlled flow rate of 200 500cc min 500cc min is the recommended flow Observe that the ITM display decrease
67. oHsCL CoHsSH CoHsCHs C H 0 n d 1 4 40 45 n d 4 40 200 40 200 n d 40 55 C2H2 n d n d n d n d n d n d 340 45 n d n d 340 200 340 200 n d 340 55 CoHsN nid 75 45 nyd n d 75 200 75 200 n d 75 55 NH n d 1 4 5 05 n d n d nd n d n d n d AsH3 n d 170 56 n d n d 2 0 n d n d n d n d n d n d n d n d Br ajd 1 4 5 01 n d ni nd 4 nd nd ajd n d 4 4 n d n d n d 170 45 n d n d 170 200 170 200 n d 170 55 nid nd 140 45 n d n d 140 200 140 200 n d 140 55 co n d 1 4 5 0 n d nd n d n d nd nd ajd Ch n d n d n d n d n d n d n d n d n d n d n d n d Cl02 gt 10ppm n d 1 4 nid n d 4 n d nd 1 4 10 10ppm n d n d n d n d n d n d n d n d n d n d n d n d n d n d 170 72 2 0 n d n d n d n d n d n d n d CsHsOCI ajd 50 45 n d n d 50 200 50 200 n d 50 55 2 50 n d n d n d n d n d n d 180 45 n d n d 180 200 180 200 n d 180 55 CoHsSH ajd njd 5 lt 3 aid nfd od nfd nd na C2H4 n d n d n d n d n d n d 220 45 n d n d 220 200 220 200 n d 220 55 C2H40 ajd 1 4 275 45 n d n d 275 200 275 200 n d 275 55 F ajd njd 240 nid ad n d n d nd n d CH 0 n d n d n d n d n d n d 330 45 n d n d 330 200 330 200 n d 330 55 n d n d n d n d n d n d n d n d n d n d n d n d n d n d n d n d n d n d n d n d ppm n d n d n d n d n d n d n d n d
68. on terminal board If nuisance alarms are happening at night suspect condensation in condulet Add or replace Detcon s Condensation Prevention Packet P N 960 202200 000 Investigate the presence of other target gases that are causing cross interference signals Determine if cause is RFI induced 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 Swap with a known good ITM to determine if ITM is faulty Low Battery Low Voltage Fault Possible Cause Lithium Ion batteries are depleted e Change out all three of the Lithium Ion non rechargeable size batteries with new batteries Contact the Detcon Service Department for further troubleshooting assistance at NOTE 551 367 4100 CXT DM Instruction Manual Rev 1 5 Page 38 of 52 a detcon inc Model CXT DM 7 Customer Support and Service Policy Detcon Headquarters Shipping Address 4055 Technology 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 service detcon com sales detcon com All Technical Service and Repair activities should be handled by the Detcon Service Department via phone fax or email at contact information given above RMA numbers should be obtained from the Detcon S
69. ontact 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 location 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 4 and are used on the LED display to indicate when the magnetic switches are activated The location of PGMI and PGM are shown in Figure 15 5 aonn LED Display MODEL gt Program Switch 1 Program Switch 2 N 7 ZERO SPAN O Sensor_ A Figure 15 Magnetic Programming Switches NOTE 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 changing values inside menu items if there is no magnet activity after 3 4 seconds the sensor will revert to the menu scroll If the sensor is in Bump Test mode the display will remain active CXT DM Instruction Manual Rev 1 5 Page 16 of 52 a detcon inc Model CXT DM 3 1 Operator Interface The operating interface is menu driven via the two magnetic program sw
70. r Cross Interference Data Table Table 5 Cross Interference Table refer to Section 9 3 Interference Table lists the gases typically found in industrial environments that may cause a cross interference response on members of the Detcon family of toxic gas sensors Review Table 5 in Section 9 3 for the correct gas and then scan across the list for possible interference gases Determine the magnitude of cross interference that may occur 2 4 Sensor Mounting The CXT DM should be vertically oriented so that the sensor points straight downward explosion proof enclosure or junction box is typically mounted on a wall or pole See Figure 11 Detcon provides a selection of standard junction boxes in both Aluminum and Stainless Steel NOTE If wall mounting without a mounting plate make sure to use at least 0 5 spacers underneath the Detcon Aluminum Junction Box s 1 4 mounting holes to move the sensor assembly away from the wall and allow access clearance to the sensor assembly NOTE Do not use Teflon Tape or any other type of Pipe Thread material on the 34 threads unless the sensor is mounted in a severe or harsh environment Metal on metal contact must be maintained to provide a solid electrical ground path If Teflon Tape is used the Sensor must be externally grounded using a ground strap 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 Mounti
71. r Specific Data 500 005 180 100 CXT Smart Battery Terminal Board 976 0BP303 012 Plug in Battery Pack 12V 2200mAh Rechargeable 976 0BP303 290 Plug In Battery Pack 12V 2900mAh Rechargeable 360 0265500 000 Lithium Primary 3 6V C size battery Not rechargeable 360 036500 000 Battery Lithium 3 6V D size Not rechargeable 960 202200 000 Condensation prevention packet For condulet replace annually 602 003870 000 Tri C Size Battery Holder Assembly 602 004402 000 D Sized Battery Pack Assembly for 5 cell replaceable non rechargeable Part Number Sensor Accessories 613 120000 700 Sensor Splash Guard with integral Cal Port 602 003803 000 CXT DM Splashguard Adapter Assembly 602 003803 200 CXT DM 25 Splashguard Adapter Assembly 943 002273 000 Harsh Environment Sensor Guard 327 000000 000 Programming Magnet Part Number Calibration Accessories 943 000006 132 Threaded Calibration Adapter 943 000000 000 Calibration Wind Guard 943 01747 T05 Calibration Adapter for highly reactive gases 943 050000 132 Span Gas Kit Includes calibration adapter span gas humidifier 500cc min fixed flow regulator and carrying case Not including gas 943 050000 HRG Highly Reactive Gas Span Gas Kit Used for NH Cl HBr etc See Detcon Span Gases various 943 05 00 000 500 cc min Fixed Flow Regulator for span gas bottle Part Number Optional A
72. rsonnel or the environment and will void the warranty CXT DM Instruction Manual Rev 1 5 Page 4 of 52 detcon inc Model CXT DM Figure 7 Smart Battery Pack Quad Battery Charger Optional Detcon s Smart Battery Pack can be charged as needed using Detcon s optional Quad Battery Charger which can charge up to four battery packs at one time The Quad Battery Charger comes with a plug in AC DC adapter that plugs into 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 Figure 8 Quad Battery Charger 1 4 2 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 con
73. rt a Clearing Fault for 1 minute NOTE When calibrating O2 deficiency sensors there is no requirement to clear to lt 5 of range The sensor will return to normal operation immediately after span adjustment AutoSpan calibration is complete NOTE 1 If the sensor fails the minimum signal change criteria a Range Fault will be declared and the Range Fault fault bit will be set on the Modbus output NOTE 2 If the sensor fails the clearing time criteria a Clearing Fault will be declared and the Clearing Fault fault bit will be set on the Modbus output CXT DM Instruction Manual Rev 1 5 Page 21 of 52 a detcon inc Model CXT DM 3 4 Program Mode Program Mode provides a View Sensor Status menu to check operational and configuration parameters Program Mode provides for adjustment of the detection range AutoSpan Level RF Channel and Modbus ID Additionally Program Mode includes the diagnostic function Bump Test and Restore Defaults The Program Mode menu items appear in the order presented below View Sensor Status Set Detection Range Set Autospan Level Bump Test Restore Defaults Set RF Channel Set Modbus ID Navigating Program Mode From Normal Operation enter Program Mode by holding the magnet over PGM2 for 3 seconds Note the p prompt will show that the magnetic switch is activated during the 3 second hold period If the sensor is experiencing a fault condit
74. s text scroll The user can either 1 review list again by executing another 3 4 second hold 2 move to another menu item by executing a momentary hold over PGM1 or PGM2 or 3 return to Normal Operation via automatic timeout of about 15 seconds the display will scroll View Sensor Status 4 times and then return to Normal Operation 3 4 2 Set Detection Range The full scale range of a CXT DM sensor is determined at the time of order The Plug in Sensor is factory calibrated for this range The range should not be changed in the field unless directed to do so by Detcon CXT DM Instruction Manual Rev 1 5 Page 23 of 52 detcon inc Model CXT DM 1 The sensor range should not be changed in the field unless directed to do so by Detcon 3 4 3 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 1 to approximately 75 or 95 dependent on full scale 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 p 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 is the current gas level Swipe the magnet momentarily over PGM2 to increase or PGM
75. s to a level near zero NOTE Wind Guard must be used when calibrating with the integral cal port to ensure proper calibration b Remove test gas and calibration adapter The ITM display should return to a reading of 20 9 Initial operational tests are complete CXT DM O deficiency 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 zero and span calibration instructions in Section 3 3 CXT DM Instruction Manual Rev 1 5 Page 15 of 52 LI detcon Inc Model CXT DM 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 see Figure 15 The two switches labeled PGMI and PGM2 allow for complete calibration and configuration thereby eliminating the need for area de classification or the use of hot permits DETCON 3270 PROGKAMMING 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 Swiping the magnet does not display the For momentary c
76. scroll hold the magnet over PGM1 or PGM2 until the p prompt appears and continue to hold the magnet in place for an additional 3 4 seconds until the display starts to scroll Status Is The display will scroll the complete list of sensor status parameters sequentially Main processor firmware version The menu item appears as App HEHP Co processor firmware version The menu item appears as App Rf firmware version CXT DM Instruction Manual Rev 1 5 Page 22 of 52 detcon inc Model CXT DM The menu item appears as Rf App HR Rf Software version The menu item appears as Rf Sw Modbus ID The menu item appears as Modbus ID is Serial Number The menu item appears as Serial Number 7 This is the serial number for the radio embedded in the CXT DM RF Channel The menu item appears as Channel Network ID The menu item appears as Network ID HHHP Range The menu item appears as Range AutoSpan Level The menu item appears as Auto Span Level Temperature Compensation Level The menu item appears as Tempcomp Level Last Cal The menu item appears as Last Cal Days Sensor Life The menu item appears as Sensor Life Temperature The menu item appears as Temperature C When the status list sequence is complete the ITM will revert to the View Sensor Statu
77. stances Painting sensor assemblies is prohibited CXT DM Instruction Manual Rev 1 5 Page 8 of 52 a detcon inc Model CXT DM 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 the 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 Electrochemical toxic gas may be adversely affected by exposure to other airborne gases Depending on the cross sensitivity relationship there may be a positive or negative impact on the reading The most commonly present gases that potentially cause interference problems are listed in Table 4 Interfering Gases and Table 5 Cross Interference Table Refer to section 9 3 Interference Table The presence of cross interference gases in an area does not preclude the use of this sensor technology although it is possible that the sensor could experience a false high or false low reading should exposure occu
78. tation transceivers CXT DM transceivers can be deployed with less concern about physical location 1 4 Battery Pack Options The CXT DM can be powered by an optional battery pack that enables it to be remotely mounted without the need for external cabling Detcon offers several battery pack options These options are factory installed Contact Detcon for more information on these options 141 Detcon s Smart Battery Pack The Detcon s plug in Smart Battery Pack provides an output of 12VDC See Figure 7 The CXT DM monitors the battery pack for remaining battery life The battery pack consists of rechargeable Lithium Ion batteries and is equipped with integrated safety electronics that include fuel gauge voltage current and temperature monitoring circuits This smart circuitry continuously monitors the battery s condition and reports critical status information to the wireless transceiver via the Modbus registers The battery pack is designed to plug onto an 8 pin Beau connector on a Terminal Board that the sensor is connected to The battery Pack and Terminal Board are housed in the Detcon Aluminum Condulet to protect them from exposure to outside elements and still provide Class I Div 1 C and D approvals Operating periods before recharge will vary based on sensor attached but can be as long as 5 6 months and battery life can be up to 5 years before battery pack replacement is required Improper use of the battery pack may be hazardous to pe
79. tcon for Ordering Information Recommended span gas is 50 of range with target gas Other suitable span gas sources containing the target gas in air or balance acceptable NOTE 1 Contact Detcon for Ordering Information on Span Gas cylinders NOTE 2 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 500cc min being the recommended flow rate Other concentrations can be used if they fall within allowable levels of 596 to 10046 of range NOTE 3 The Calibration Wind Guard must be used when the Splashguard Adapter with integral Cal Port is used Failure to use the Calibration Wind Guard may result in an inaccurate AutoZero calibration NOTE 4 Ambient air should be used to calibrate O2 deficiency sensors as long as the oxygen concentration is confirmed to be 20 9 NOTE 5 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 CAUTION Verification that the calibration gas level setting matches the calibration span gas concentration is required before executing AutoSpan calibration These two numbers must be equal 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 calibrat
80. te 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 Auto Span Fault Global Fault CXT DM Instruction Manual Rev 1 5 Page 30 of 52 a detcon inc Model CXT DM 4 2 0 Transceiver Registers 4 2 2 1 Battery Info Multiple Registers If a Detcon smart battery pack is connected to the CXT there are five registers associated with information about that battery The utilizes the interface to read battery status and only one Detcon battery pack can be read per CXT The controller can determine if a battery is present by reading the Status Register register 8204 There are two bits in this sixteen bit register pertaining to the battery Battery Detect bit 4 lowest bit is 0 and 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 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 8206 Batt Read Fails will increment by 4 each time there is
81. to the sensor until all wiring is properly terminated Refer to Section 2 6 Initial Start Up Applying power to the unit 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 installing or changing out the batteries or battery pack a Forunits utilizing the 12V Smart Battery Pack 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 sized lithium 3 6V batteries and battery holder install the batteries being careful to 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 Section 2 6 4 Replace the junction box cover after Initial Start Up CXT DM Instruction Manual Rev 1 5 Page 12 of 52 p Model CXT DM detcon inc To External 24V Power Return To Sensor Figure 13 Terminal Interconnect for Smart Ba
82. ts a drain should be incorporated The drain allows condensation inside the conduit run to safely drain away from the sensor assembly The electrical seal fitting is required to meet the National Electrical Code per NEC Article 500 3d or Canadian Electrical Code Handbook Part 1 Section 18 154 Requirements for locations of electrical seals are covered under NEC Article 501 5 Electrical seals also act as 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 NOTE conduit seal is typically required to be located within 18 of the J Box and Sensor Assembly Crouse Hinds type EYS2 EYD2 or equivalent are suitable for this purpose NOTE The Detcon Warranty does not cover water damage resulting from water leaking into the enclosure NOTE Any unused ports should be blocked with suitable 34 male NPT plugs Detcon supplies one 4 NPT male plug with each J box enclosure If connections are other than 34 NPT use an appropriate male plug of like construction material If the Detcon CXT DM was ordered with one of the optional 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 CAUTION Do not apply System power
83. ttery Pack NOTE A 6 32 or 8 32 threaded exterior ground point is provided on most junction boxes for an 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 Toxic Gas Sensors Upon completion of all mechanical mounting install the batteries this will apply power 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 DM V and will then display the current reading for about 5 seconds A temporary upscale reading may occur as the sensor stabilizes This upscale reading will decrease to 0 ppm within 1 2 minutes of power up assuming there is gas in the area of the sensor Sensors cells that use a bias voltage require a longer time to stabilize This can vary between 1 and 24 hours depending on the sensor type and range Biased sensors include NO and VOC gases ethylene oxide ethylene methanol formaldehyde etc 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 NOTE In normal operation the display will come on once every 10 seconds will display the
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