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Model CXT-DM

 

CXT-DM Instruction Manual 

                                Rev. 2.0 

Page 4 of 54 

1.3

 

CXT Wireless Network 

The CXT-DM 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 station 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. 
 

1.4.1

 

Detcon’s Smart Battery Pack 

 
The Detcon’s plug-in Smart Battery Packs  provides an output of 12VDC (See Figure  7).  There are two 
versions of the Smart Battery Pack.  The first one is the 12V 2200mAh battery Pack (Detcon’s part number 
976-0BP303-120) and the second is the 12V 2900mAh Battery Pack.  The CXT-DM monitors the battery pack 
for remaining battery life.

  

The battery packs consists of rechargeable Lithium-Ion batteries and are equipped 

with integrated safety electronics that include a  fuel gauge, voltage  monitor,  and  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 packs are designed to 
plug into an 8-pin Beau connector on the Terminal Board that the sensor is connected to.  The battery Pack and 
Terminal Board are housed in Detcon’s  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 3.5 months for the 12V 2200mAh battery pack, and 5 months 
for the 12V 2900mAh battery pack before battery recharging is required.    Improper use of the battery pack 
may be hazardous to personnel or the environment and will void the warranty.   
 

Содержание CXT-DM

Страница 1: ...cy 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 ww...

Страница 2: ...Model CXT DM Model CXT DM ii This page left intentionally blank...

Страница 3: ...ormal Operation 20 3 3 Calibration Mode 20 3 3 1 AutoZero 21 3 3 2 AutoSpan 22 3 4 Program Mode 23 3 4 1 Navigating Program Mode 24 3 4 2 View Sensor Status 24 3 4 3 Set Detection Range 26 3 4 4 Set A...

Страница 4: ...gure 4 Sensor Assembly Breakaway 3 Figure 5 Functional Block Diagram 3 Figure 6 Plug in Sensor 3 Figure 7 Smart Battery Pack 5 Figure 8 Quad Battery Charger 5 Figure 9 D Cell Lithium Battery Pack 6 Fi...

Страница 5: ...el housing and includes a Splash Guard Cal Adapter The sensor is installed on an explosion proof junction box with a choice of battery pack options making operation fully independent of outside cablin...

Страница 6: ...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 exp...

Страница 7: ...r 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 intr...

Страница 8: ...m station 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 b...

Страница 9: ...t 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...

Страница 10: ...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...

Страница 11: ...Model CXT DM CXT DM Instruction Manual Rev 2 0 Page 7 of 54 Figure 10 Tri C Lithium Battery Holder...

Страница 12: ...e unless it is conformed the there is no explosive gas levels in the area 3 A good ground connection should be verified between the sensor s metal enclosure and the junction box If a good ground conne...

Страница 13: ...290 2900mAh rechargeable Lithium batteries 16 The CXT DM contains FCC ID U90 RF200 and IC 7084A RF200 17 The CXT DM complies with FCC Maximum Permissible Exposure MPE requirements when used with an a...

Страница 14: ...ould 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 12 Im...

Страница 15: ...he 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 s...

Страница 16: ...nt 7 45 3 4 NPT Port 9 5 Wall or other mounting surface Splash Guard Adapter Splash Guard ITM Assembly 23 Typ Use spacers to move sensor assembly away from wall at least 0 5 Spacer 1 4 mounting holes...

Страница 17: ...Page 13 of 54 6 32 tapped ground point 4 1 3 4 NPT Port 3 64 0 4 X 0 475 mounting holes Splash Guard Adapter Splash Guard ITM Assembly 3 45 22 Typ Mini Condulet with Battery Holder and Batteries Figu...

Страница 18: ...material CAUTION Do not apply power to the sensor until all wiring is properly terminated See section 2 6 Initial Start Up 2 5 1 Applying Power to the Unit CAUTION A 24V solar panel is the most common...

Страница 19: ...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 p...

Страница 20: ...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 Guar...

Страница 21: ...0 500cc min 500cc min is the recommended flow Observe that the ITM display decreases to a level near zero NOTE Wind Guard must be used when calibrating with the integral cal port to ensure proper cali...

Страница 22: ...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...

Страница 23: ...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...

Страница 24: ...out PGM1 2 3 PGM1 2 M AutoTime out PGM1 2 3 PGM1 2 M inc inc inc inc PGM2 S PGM1 2 3 PGM1 S Alarm 2 Level Y N Alarm 2 Ascending Y N Alarm 2 Latching Y N Alarm 2 Energized dec AutoTime out PGM1 2 3 PGM...

Страница 25: ...99 for O2 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 inaccu...

Страница 26: ...lashguard 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...

Страница 27: ...eed 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...

Страница 28: ...d the magnet over PGM1 or PGM2 while the menu item is scrolling At the conclusion of the text scroll the prompt for PGM2 or for PGM1 will appear continue to hold the magnet over PGM1 or PGM2 for an ad...

Страница 29: ...u 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 S...

Страница 30: ...ntil the display starts to scroll Set Level The display will switch to XX where XX is the current gas level Swipe the magnet momentarily over PGM2 to increase or PGM1 to decrease the AutoSpan Level un...

Страница 31: ...ry default settings The 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 o...

Страница 32: ...t serial ID can be viewed in View Sensor Status The menu item appears as Set Serial ID From the Set Modbus ID text scroll hold the programming magnet over PGM1 or PGM2 until the prompt appears and con...

Страница 33: ...at for Modbus consists of a Modbus address function code data and CRC Address Field Function Code Data CRC Figure 18 Modbus Frame Format The Modbus ID Field is the unique Modbus address of each device...

Страница 34: ...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 receiv...

Страница 35: ...ng R Set during production test 0018 String R Set during production test 0019 String R Set during production test 0020 String R Set during production test 0021 String R Set during production test 0022...

Страница 36: ...plied Seconds High 8209 Timestamp 1 R Time since power applied Seconds Low 8210 Timestamp 2 R Time since power applied Milliseconds 4 2 1 CXT Sensor Registers 4 2 1 1 Sensor Faults Register 0005 The s...

Страница 37: ...ntage is a value between 0 and 100 and battery life in minutes is an unsigned value between 0 and 65535 Both readings are generally necessary to provide appropriate feedback to the user Life in minute...

Страница 38: ...n control a particular function and should be read first then modify the bits needed and written back The default state of the register is 0 All reserved bits should always be set to a 0 when writing...

Страница 39: ...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 pack 5 1 1 Un...

Страница 40: ...correctly can cause damage to the batteries the battery holder and the unit refer to Figure 19 It is permissible to use only Tadiran Model TL 5930 batteries Do NOT use regular D size batteries as this...

Страница 41: ...y 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 hold...

Страница 42: ...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...

Страница 43: ...d the wrench flats provided at the top section of the ITM and unthread the ITM until it can be removed 4 Use a 1 8 Allen wrench to release the locking cap head screw that locks the ITM and Splashguard...

Страница 44: ...le Causes Failed Sensor empty or close to empty Cal Gas Cylinder problems with cal gas and delivery Check validity of span gas using pull tube or other means check MFG date on cal gas cylinder Use pro...

Страница 45: ...table Verify field wiring is properly shielded and grounded Contact Detcon to optimize shielding and grounding Add Detcon s RFI Protection Circuit accessory if problem is proven RFI induced Nuisance A...

Страница 46: ...anty 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 damage...

Страница 47: ...81 for necessary repairs or replacement Terms Conditions The original serial number must be legible on each sensor element base Shipping point is FOB the Detcon factory Net payment is due within 30 da...

Страница 48: ...plosion proof CXT DM Canada and US NRTL Class I Division 1 Groups C and D Tamb 40 Cto 50 C Class I Zone 1 Group IIB ATEX IECEx ExdibIIBT4Gb Tamb 40 Cto 50 C SIRA14ATEX1034X EN60079 0 2012 EN60079 1 20...

Страница 49: ...ears Br2 Bromine 371 747500 005 T90 60 2 signal loss month 20 to 50 15 to 90 2 years C4H6 Butadiene 371 12EB00 100 T90 140 5 signal loss year 20 to 50 15 to 90 2 years CO Carbon Monoxide 371 444400 10...

Страница 50: ...o 50 15 to 90 2 years CH3OH Methanol 371 12EE00 100 T90 140 5 signal loss year 20 to 50 15 to 90 2 years CH3SH Methyl Mercaptan 371 24EK00 100 T90 45 2 signal loss month 40 to 50 15 to 90 2 years NO N...

Страница 51: ...H Amines Amines Ethyl Mercaptan C2H5SH Nitric Oxide NO Ammonia NH3 Ethylene C2H4 Nitrogen N2 Arsenic Trifluoride AsF3 Ethylene Oxide C2H4O Nitrogen Dioxide NO2 Arsenic Pentafluoride AsF5 Fluorine F2 O...

Страница 52: ...d n d C2H4 220 40 220 340 220 75 n d n d n d n d n d n d n d n d 220 170 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 GeH4 n d n d n d n d n d 100 1 n d n d 0 2 0 14 n d n d n d...

Страница 53: ...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 F2 5000 0 n d 1000 0 n d 1 1 3 n d n d n d n d n d n d n d n a GeH4 5000 0 n d 300 0 n d 0 5 0 04 n d n d 0 2 0 11 n d 5 yes...

Страница 54: ...5 n d 5 0 10 0 n d n d C2H4 n a 220 275 220 330 n d n d n d n d n d n d n d n d n d n d F2 n d n d n d n d n d range 0 n d 1 0 n d 5 0 1 3 3 0 n d GeH4 n d n d n d n a n d range 0 n d 3000 0 n d 5 0 1...

Страница 55: ...d n d 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 F2 n d 1 1 5 n d n d n d n d n d n d 100 0 1 0 05 0 1 0 2 n d n d GeH4 0 05 0 005 1 0 n d n d n d n d n d n d 100 0 n d n d n d 0...

Страница 56: ...d n d n d 5 3 n d n d n d n d n d n d n a n d 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 F2 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 GeH4 n d 1 1 n d n d 2 0 n d...

Страница 57: ...Size Battery Holder for Lithium 3 6V non rechargeable C Size 602 004402 000 D Sized Battery Holder for Lithium 3 6V non rechargeable D Size Part Number Sensor Accessories 613 120000 700 Sensor Splash...

Страница 58: ...is the cable length in meters 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 hazardous location to i...

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