Detcon CXT-DM Manuel utilisateur

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

December 08, 2015 • Document # 3804 • Revision 2.0

Model CXT-DM

Model CXT-DM ii

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Model CXT-DM

Model CXT-DM iii

Table of Contents

1. Introduction ................................................................................................................................................1

1.1 Description.......................................................................................................................................... 1

1.2 Modular Design .................................................................................................................................. 2

1.2.1 CXT-DM Intelligent Transmitter Module...................................................................................... 3

1.2.2 Field Replaceable Sensor................................................................................................................ 3

1.3 CXT Wireless Network....................................................................................................................... 4

1.4 Battery Pack Options .......................................................................................................................... 4

1.4.1 Detcon’s Smart Battery Pack.......................................................................................................... 4

1.4.2 D Cell Lithium Battery Pack.......................................................................................................... 5

1.4.3 Tri-C Lithium Battery Pack............................................................................................................ 6

2. Installation...................................................................................................................................................8

2.1 Hazardous Locations Installation Guidelines for Safe Use................................................................. 8

2.2 Sensor Placement................................................................................................................................ 9

2.3 Sensor Contaminants and Interference ............................................................................................. 11

2.4 Sensor Mounting............................................................................................................................... 11

2.5 Electrical Installation........................................................................................................................ 14

2.5.1 Applying Power to the Unit.......................................................................................................... 14

2.6 Initial Start Up................................................................................................................................... 15

2.6.1 Toxic Gas Sensors........................................................................................................................ 15

2.6.2 O2Deficiency Sensors.................................................................................................................. 16

3. Operation...................................................................................................................................................18

3.1 Operator Interface............................................................................................................................. 19

3.2 Normal 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 Autospan Level....................................................................................................................... 26

3.4.5 Bump Test .................................................................................................................................... 26

3.4.6 Restore Defaults ........................................................................................................................... 27

3.4.7 Set RF Channel............................................................................................................................. 27

3.4.8 Alarm Settings.............................................................................................................................. 28

3.4.9 Set Modbus ID.............................................................................................................................. 28

3.5 Fault Diagnostic/Failsafe Feature ..................................................................................................... 28

4. Modbus™ Communications....................................................................................................................29

4.1 General Modbus™ Description........................................................................................................ 29

4.1.1 Modbus™ Exceptions .................................................................................................................. 29

4.1.2 Modbus™ Broadcast Requests..................................................................................................... 30

4.2 Modbus™ Register Map & Description........................................................................................... 30

4.2.1 CXT Sensor Registers .................................................................................................................. 32

4.2.2 CXT Transceiver Registers .......................................................................................................... 33

5. Service and Maintenance.........................................................................................................................35

5.1 Replacement of the batteries/battery pack........................................................................................ 35

5.1.1 Units with 12V Smart Battery Pack.............................................................................................. 35

5.1.2 Units with D-Size Non-Rechargeable Batteries ........................................................................... 35

5.1.3 Units with Tri ‘C’ sized Lithium Battery Holder ......................................................................... 36

5.2 Replacement of Plug-in Sensor......................................................................................................... 37

5.3 Replacement of ITM – Aluminum J-Box ......................................................................................... 38

Model CXT-DM

Model CXT-DM iv

5.4 Replacement of ITM – Stainless Steel Mini Condulet...................................................................... 39

6. Troubleshooting Guide............................................................................................................................ 40

7. Customer Support and Service Policy................................................................................................... 42

8. CXT-DM Sensor Warranty.................................................................................................................... 43

9. Appendix .................................................................................................................................................. 44

9.1 Specifications.................................................................................................................................... 44

9.1.1 System Specifications................................................................................................................... 44

9.1.2 Environmental Specifications....................................................................................................... 44

9.1.3 Electrical Specifications ............................................................................................................... 44

9.1.4 Mechanical Specifications (ITM Only)........................................................................................ 45

9.2 Sensor Specific Data......................................................................................................................... 45

9.3 Interference Table............................................................................................................................. 47

9.4 Spare Parts, Sensor Accessories, Calibration Equipment................................................................. 53

9.5 Revision Log..................................................................................................................................... 54

Table of Figures

Figure 1 Sensor Assembly with J-Box and Smart Rechargeable Battery Pack.................................................... 1

Figure 2 Construction of Electrochemical Toxic Sensor...................................................................................... 2

Figure 3 Construction of Galvanic Cell................................................................................................................ 2

Figure 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

Figure 10 Tri C Lithium Battery Holder.............................................................................................................. 7

Figure 11 Approval Labels................................................................................................................................... 8

Figure 12 CXT-DM Sensor with D or Smart Battery Pack Mounting Dimensions........................................... 12

Figure 13 CXT-DM Sensor with Lithium Battery Pack..................................................................................... 13

Figure 14 Terminal Interconnect for Smart Battery Pack .................................................................................. 15

Figure 15 Magnetic Programming Tool............................................................................................................. 18

Figure 16 Magnetic Programming Switches...................................................................................................... 18

Figure 17 Menu Flow Chart............................................................................................................................... 20

Figure 18 Modbus™ Frame Format................................................................................................................... 29

Figure 19 Battery Orientation Diagram.............................................................................................................. 36

Figure 20 Battery Orientation Diagram.............................................................................................................. 37

Figure 21 Sensor Cell and ITM Mating ............................................................................................................. 38

List of Tables

Table 1 Exception Codes.................................................................................................................................... 30

Table 2 CXT-DM Register Map......................................................................................................................... 31

Table 3 Sensor Specific Data ............................................................................................................................. 45

Table 4 Interfering Gases................................................................................................................................... 47

Table 5 Cross Interference Table ....................................................................................................................... 48

Model CXT-DM

CXT-DM Instruction Manual Rev. 2.0 Page 1 of 54

1. Introduction

1.1 Description

Detcon Compact Wireless Sensor Model CXT-DM toxic gas and O2deficiency 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 0-1ppm up to 0-10,000ppm; typical ranges of

detection are 0-10ppm, 0-25ppm, 0-50ppm and 0-100ppm. Ranges for O2deficiency are 0-1% up to 0-25% by

volume. The basic sensor assembly consists of an electrochemical sensor mounted in Intrinsically Safe

stainless steel 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 cabling.

Other options are available, contact Detcon for more information.

Figure 1 Sensor Assembly with 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.

Model CXT-DM

CXT-DM Instruction Manual Rev. 2.0 Page 2 of 54

Figure 2 Construction of Electrochemical Toxic Sensor

The O2deficiency 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.

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.

Model CXT-DM

CXT-DM Instruction Manual Rev. 2.0 Page 3 of 54

CXT / 700 DM Series

Bottom Housing Assembly

Plug-in

Replaceable

Sensor Intelligent Transmitter Module (ITM)

Micro-processor controlled circuit

encapsulated in an Explosion proof

housing.

Magnetic

Programming

Switches

Splash Guard

34" NPT Locking NutFerrite Bead

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.

1.2.1 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.

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

I/O

Circuit

Protection

Accessory

connections

Antenna

Power In

Wireless

Power

supplies

Micro-

Processor

Intrinsically

Safe Barrier

Plug-In

Sensor

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.

Model CXT-DM

CXT-DM Instruction Manual Rev. 2.0 Page 5 of 54

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 D Cell Lithium Battery Pack

The D Cell Lithium Battery Pack (Figure 9) contains five 3.6V Lithium Primary D size batteries which are not

re-chargeable. This battery pack provides the unit with 18 volts. The batteries are contained in a battery holder

mounted in Detconꞌs aluminum explosion proof condulet. The CXT-DM sensors will operate up to 9 months

before battery replacement is needed. The battery Pack and Terminal Board are housed in Detcon’s Aluminum

Model CXT-DM

CXT-DM Instruction Manual Rev. 2.0 Page 6 of 54

Condulet to protect them from exposure to outside elements and still provide Class I Div 1, C, and D

approvals.

Figure 9 D-Cell Lithium Battery Pack

1.4.3 Tri-C Lithium Battery Pack

The Tri-C Lithium Battery Pack (Figure 10) 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 Detconꞌs stainless steel explosion proof mini-condulet.

This option offers a smaller foot print, but provides less run time than Detcon’s Smart Battery Pack. The CXT-

IR sensors can operate for up to 60 days before battery replacement is needed. The addition of Detconꞌs

Stainless Steel Mini Condulet provides Class I Div 1, Group C, and D ratings.

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