AMC AMC-DTR User manual

DTR
Sensor Transmitter
INSTRUCTIONS
Installation and Operation of the
AMC-DTR
Sensor Transmitter
IMPORTANT:
Please read these installation and operating instructions completely
and carefully before starting.
Filename: Manual_amc-DTR ver 2.5.doc Copyright ©, July 18, 2011, AMC
The Armstrong Monitoring Corporation
215 Colonnade Road South, Ottawa, Ontario, Canada K2E 7K3
Tel: [phone] • Fax: [phone] • U.S. Toll Free: [phone]
E-mail: [e-mail] • Internet:www.armstrongmonitoring.com

AMC-DTR Sensor Transmitter User Manual

AMC-DTR Sensor Transmitter User Manual
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TABLE OF CONTENTS
Section Title Page
1GENERAL INFORMATION..................................................................................... iii
1.1 WARRANTY.......................................................................................................iii
1.2 LIABILITY...........................................................................................................iii
1.3 PRODUCT RETURN .........................................................................................iii
1.4 CONTACT INFORMATION................................................................................iv
1.5 MODIFICATIONS AND SUBSTITUTIONS.........................................................iv
2PRODUCT INFORMATION...................................................................................... v
2.1 Transmitter......................................................................................................... v
2.2 Factory Settings ................................................................................................. v
3SAFETY INFORMATION ......................................................................................... 1
3.1 Safety Information – Read Before Installation & Applying Power....................... 1
4INSTALLATION INSTRUCTIONS............................................................................ 2
4.1 Introduction ........................................................................................................ 2
4.2 Ratings and Certifications .................................................................................. 3
4.3 Sensor Location ................................................................................................. 3
4.4 Mounting the Enclosure ..................................................................................... 4
4.5 System Design Specifications............................................................................ 6
4.6 Field Wiring Installation ...................................................................................... 6
4.6.1 2-Wire 4-20mA Mode Installation ............................................................................. 7
4.6.2 3-Wire 4-20mA Mode Installation ............................................................................. 8
4.7 Alarms / RS-485 Modbus DTR-10-0234 Option Installation............................... 9
4.8 Isolated 4-20mA Output DTR-10-0250 Option ................................................. 10
4.9 Sensor Installation (with Smart/Simple Sensor Definition) ............................... 11
4.9.1 Electrochemical Sensor Wiring to the DTR-10-0232 Display ................................ 12
4.9.2 Catalytic Bead Sensor Wiring to the DTR-10-0233 I/O Power Supply.................. 13
4.9.3 Remote 2 and 3 wire 4-20mA transmitter wiring to the DTR-10-0233 I/O Power
Supply Board(3 wire Shown)................................................................................................. 14
4.10 “Sensor Type” and AMC-DTR Signal Conditioning....................................... 15
5INITIAL START-UP................................................................................................ 16
5.1 “Transmitter Configuration” Menu .................................................................... 16
5.1.1 Single / Dual Gas Monitor Configuration................................................................ 16
5.2 Initial Catalytic Bead LEL Monitor Start-Up ...................................................... 16
5.2.1 Initial Catalytic Bead LEL Monitor “Sensor Volts” Check....................................... 16
5.2.2 Initial Catalytic Bead LEL Monitor “Balance” Check .............................................. 17
5.2.3 Initial Catalytic Bead LEL Monitor “Span” Check ................................................... 17
5.3 Initial Toxic / Oxygen Monitor Start-Up............................................................. 17
5.3.1 Initial Toxic / Oxygen Monitor “Span” Check.......................................................... 17
6OPERATING INSTRUCTIONS............................................................................... 18
6.1 Routine Sensor Calibrations............................................................................. 18
6.2 Alarm Operation ............................................................................................... 20
6.2.1 ALARM 3 – Understanding Fault / Level Operation............................................... 20
7SETUP MENU CONFIGURATION......................................................................... 21
7.1 Menus Database Configuration........................................................................ 21

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7.2 Configuration Using the Magnetic Wand.......................................................... 22
7.3 System Configuration Menus ........................................................................... 22
7.4 Alarm Settings.................................................................................................. 23
7.4.1 Relay Configuration (if equipped)........................................................................... 24
7.5 Sensor Information........................................................................................... 25
7.6 CLOCK/DELAY Setup...................................................................................... 26
7.7 LCD Contrast Adj ............................................................................................. 26
7.8 HELP Screen ................................................................................................... 26
7.9 Diagnostics....................................................................................................... 26
7.10 RS-485 / MODBUS Setup............................................................................. 27
7.10.1 MODBUS Register and Function Code Summary ................................................. 27
7.11 System Security............................................................................................ 30

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1G N RAL INFORMATION
1.1 WARRANTY
The AMC-DTR is warranted against defects in material and workmanship for a period of two
years from date of delivery. Maintenance items are not warranted. During the warranty period,
The Armstrong Monitoring Corporation will repair or replace components that prove to be
defective in the opinion of AMC. Any equipment deemed to be defective by the user should be
returned to The Armstrong Monitoring Corporation for evaluation (see product return below).
Site visits by Armstrong personnel, to evaluate/repair equipment, are not covered by this
warranty. AMC is not liable for auxiliary interfaced equipment, nor for consequential damage.
This warranty shall not apply to any product, which has been modified in any way, which has
been repaired by any other party other than a qualified technician or authorized AMC
representative, or when failure is due to misuse or conditions of use.
Note: extended warranty mail in calibration programs are available (please call 1-800-465-
5777).
1.2 LIABILITY
All AMC products must be installed and maintained according to instructions. Only qualified
personnel should install and maintain the equipment.
AMC shall have no liability arising from auxiliary interfaced equipment, for consequential
damage, or the installation and operation of this equipment. AMC shall have no liability for
labour or freight costs, or any other costs or charges in excess of the amount of the invoice for
the products.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED,
AND SPECIFICALLY THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. THERE ARE NO WARRANTIES THAT EXTEND BEYOND THE
DESCRIPTION ON THE FACE THEREOF.
WARNING
CHECK TO ASSURE THE WORKING AREA IS FREE FROM HAZARDS DURING
INSTALLATION OR WHEN PERFORMING MAINTENANCE, AND USE PROPER
PRECAUTIONS.
1.3 PRODUCT RETURN
All products returned for warranty or service should be shipped by prepaid freight. Please obtain
a Return Material Authorization (RMA) number from AMC prior to shipping and ensure this RMA
number is clearly visible on the outside of the shipping container. Material shipped without RMA
will be rejected and returned. All products returned to the client will be shipped by freight collect.

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1.4 CONTACT INFORMATION
For information please call 1-800-465-5777 or through contacts at
www.armstrongmonitoring.com or through email directly at
[e-mail].
1.5 MODIFICATIONS AND SUBSTITUTIONS
Due to an ongoing development program, AMC reserves the right to substitute components and
change specifications at any time without incurring any obligations.

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2PRODUCT INFORMATION
2.1 Transmitter
Sensor/transmitter Unit Order Number ……………………….
Transmitter Part Number ………………………………………..
Transmitter Serial Number ………………………………………
Power Supply Requirement ……………………………………. 10 to 30 VDC
Sensor Part Number …………………………………………….
Sensor Serial Number …………………………………………..
Optional Sensor Part Number …………………………………...
Optional Sensor Serial Number …………………………………
2.2 Factory Settings
Sensor 1 Sensor 2
Gas Type ……………………………………
Range ………….……………………………
Zero Gas, at 4 mA signal …………………
Gas Concentration at 20 mA signal ……...
Alarm Settings: A1
A2
A3
Target Gas Ratio to Methane LEL ….……
Sensor Warranty …………………………...
Operating Temperature……………………
Relative Humidity…………………………...

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3SAF TY INFORMATION
3.1 Safety Information – Read Before Installation & Applying Power
IMPORTANT
Users should have a detailed understanding of AMC-DTR installation and operating instructions.
Use the AMC-DTR only as specified in this manual or detection of gases and the resulting
protection provided may be impaired. Read the following WARNINGS prior to use.
WARNINGS
•Recalibration is necessary when replacing the sensor. Verification of calibration should
be done at least once every 6 months for safety reasons, and for highly demanding
applications monthly verification is recommended. More frequent inspections are
encouraged to spot problems such as dirt, oil, paint, grease or other foreign materials on
the sensor head.
•Do not paint the sensor assembly or the Transmitter.
•Do not use the AMC-DTR if its enclosure is damaged or cracked or has missing
components.
•Make sure the cover, internal PCB’s and field wiring are securely in place before
operation.
•Use only a sensor assembly compatible with the AMC-DTR and approved by AMC.
•Periodically test for correct operation of the system’s alarm events by exposing the
monitor to a targeted gas concentration above the High Alarm setpoint.
•Do not expose the AMC-DTR to electrical shock or continuous severe mechanical
shock.
•Protect the AMC-DTR from dripping liquids and high power sprays.
•Use only for applications described within this manual.
CAUTION:
FOR SAFETY REASONS THIS EQUIPMENT MUST BE INSTALLED, OPERATED AND SERVICED
BY QUALIFIED PERSONNEL ONLY. READ AND UNDERSTAND INSTRUCTION MANUAL
COMPLETELY BEFORE OPERATING OR SERVICING.
ATTENTION: POUR DES RAISONS DE SÉCURITÉ, CET ÉQUIPEMENT DOIT ÊTRE UTILISÉ,
ENTRETENU ET RÉPARÉ UNIQUEMENT PAR UN PERSONNEL QUALIFIÉ. ÉTUDIER LE MANUE
D’INSTRUCTIONS EN ENTIER AVANT D’UTILISER, D’ENTRETENIR OU DE RÉPARER
L’ÉQUIPEMENT

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4INSTALLATION INSTRUCTIONS
4.1 Introduction
Important: This manual describes both the 2-Wire and the 3-Wire 4-20mA versions of the
AMC-DTR. 2-Wire versions are only possible if using an electrochemical sensor and the DTR-
10-0232 Display PCB IS THE ONLY PCB IN THE ENCLOSURE. If the DTR-10-0233 I/O
Power Supply is installed it is a 3-Wire version.
The AMC-DTR is a single or dual channel fixed-point gas monitor designed to provide
continuous monitoring of hazardous gases in the workplace. Monitored values are displayed in
their engineering units as well as graphically as a bar graphs or 30-minute trends (Figure 1).
Input types include Electrochemical toxic / oxygen sensors, catalytic bead combustible sensors,
MOS solid-state sensors, as well as various millivolts, volt and 4-20mA inputs. Sensors supplied
by the factory include an 8-wire Smart Sensor interface capable of configuration data uploads to
the AMC-DTR. Traditional 3-wire Simple sensors, without the smart interface, are also
supported by the AMC-DTR. Its advanced microcontroller electronics and superior graphic LCD
operator interface offers enhanced diagnostics and fault analysis not possible in competing
products. The AMC-DTR Transmitter provides a standard 4-20 mA output signal for connection
to control systems or other alarm instrumentation. Available options include an Alarm Relay /
RS-485-Modbus board or an isolated 4-20mA output. Non-volatile memory retains all
configuration data during power interruptions. The magnetic, non-intrusive calibration can be
easily performed by one person without opening the enclosure. A standard “real time clock &
calendar” feature allows data logging of calibrations and alarm events for recall to the LCD
readout or over the serial port.
A separate PC compatible USB Interface allows a Smart sensor to be loaded with configuration
variables via a PC and upload this data to the AMC-DTR. This includes alarm set points, range,
target gas, calibration constants and other variables required to match the AMC-DTR to a
specific application. For traditional Simple sensors, without the smart interface, the USB
interface allows direct AMC-DTR configuration from a PC.
Electrochemical toxic and oxygen DTR’s are capable of 2-wire 4-20mA operation (section 4.6.1)
when the alarms / modbus option and LCD backlight are not required. Catalytic LEL sensors, or
addition of the DTR-10-0234 Alarms / Modbus option, require the DTR-10-0233 I/O Power
Supply board providing 3-wire 4-20mA operation (section 4.6.2).
Only periodic calibration checks are needed to assure dependable performance. Operator
interface is very intuitive with the LCD displaying data both graphically as bar-graphs / trends
and in engineering units (Figure 1). Additional features include:
•No potentiometer or jumper settings required. All setup is with menus accessed via the LCD
/ magnetic keypad operator interface without opening the enclosure.
•Field adjustable alarm levels may be high, low, fault, fail-safe, latching and
acknowledgeable.
•New alarms cause front LED’s to flash and become steady after acknowledge.
•CAL MODE advises when to apply gas during calibrations
•One half hour trend screen shows rate of change of gas exposures
•Sensor life bar-graph updates after each SPAN calibration.
•Modular design affords efficient installation and plug in sensors allow changing target gases
after installation

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•New smart sensors are recognized by the AMC-DTR and prompts users to either upload
new configuration data or continue with data from the previous smart sensor.
•Sensors are industry proven for fast response and long life.
Figure 1: Data Displays
4.2 Ratings and Certifications
CSA certified for Division
1 & 2 hazardous area
installations for explosion
proof Class 1 Groups
B,C,D
Class 1 Groups
A,B,C,D.
(excluding
Relay/Modbus variant)
Intrinsically safe
(entity, excluding
Relay/Modbus
variant)
Designed to meet CSA C22.2 No.152 for Combustibles Monitors and ISA 92.0.01 Part 1 for
Toxic Monitors.
4.3 Sensor Location
Factors such as air movement, gas density in relation to air, emission sources and
environmental variables affect correct sensor location. Air movement by fans, prevailing winds
and convection should be carefully evaluated to determine if a leak is more likely to raise gas
levels in certain areas within the facility. Vapor density of a gas determines if it will rise or fall in
air when there are no significant currents. Lighter than air gases should have the monitors
mounted 12 – 18 inches (30 – 45 centimeters) above the potential gas leak and heavier than air
gases should be this distance below. Even though the AMC-DTR is designed for rugged
service, sensors should be protected from environmental damage from water, snow, shock,
vibration and dirt.

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4.4 Mounting the Enclosure
The AMC-DTR standard enclosure is a cast aluminum explosion-proof (NEMA 7) enclosure as
shown in Figure 2. Figure 3 shows dimensions with the dual local sensor ‘Y’ included.
ALL DIMENSIONS IN INCHES
0.276 Dia.
2 Places
3/4 NPT Hub
2 Places
SENSOR
HO SING
4.96
5.00
4.94
Figure 2: AMC-DTR Explosion-Proof Housing
4.96
5.00
4.94
Dual Sensor Head
Adapter
Figure 3: AMC-DTR Explosion-Proof Housing with Dual Sensor Head Adaptor

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Modular design simplifies the installation of the AMC-DTR. A top Display Assembly is mounted
with captive thumbscrews and is easily removed to access field-wiring terminals. An optional
DTR-10-0234 Alarms/Modbus board mounts piggyback to the back of the Display Assembly.
Wiring from toxic or oxygen sensors terminates at the DTR-10-0232 Display Assembly along
with 2-wire 4-20mA signal wires. This Display Assembly is the only PC board supplied with
toxic / oxygen AMC-DTRs not requiring relays, RS-485 ModBus or LCD backlight. The optional
bottom DTR-10-0233 I/O Power Supply board generates voltages needed for LCD backlight,
relays, RS-485 ModBus and catalytic bead LEL sensor and is required with any of these I/O
functions. The enclosure is equipped with two threaded 3/4 inch NPT conduit fitting outlet and
pre-drilled mounting flanges.
WARNING:
Qualified personnel should perform the installation according to applicable electrical
codes, regulations and safety standards. Insure correct cabling and sealing fitting
practices are implemented. Install the AMC-DTR to a wall or bracket using the
predrilled mounting flanges with I.D. 0.276 on 4.96 inch centers (Figure 2). If conduit is
rigid and able to support the weight of the AMC-DTR, the mounting bolts may be
omitted.
CAUTION:
The sensor should never be installed pointing upwards.
Figure 4: Outline Drawing

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4.5 System Design Specifications
Supply Voltage:
10 to 30 volts
Power Consumption:
•Catalytic Combustible Sensors (requires DTR-10-0233 I/O Power Supply and 3-wire operation):
100 mA @ nominal 24 VDC
•Toxic/Oxygen Sensors without Relays / Modbus Option (2-wire 4-20mA operation): 25 mA
@ nominal 24 VDC.
•Relays / RS-485 Modbus Option Board (requires DTR-10-0233 I/O Power Supply and 3-wire
operation): 40 mA per relay (120 mA total with all 3 energized); RS-485 use adds 20mA
Memory:
Non-volatile E2 memory retains configuration values in the event of power outages.
Loop Resistance at nominal 24 VDC power:
650 ohms maximum in 2-wire mode
750 ohms maximum in 3-wire mode.
Relays (Optional):
Three configurable form C (SPDT) relays rated for 5 amp at 30 VDC or 250VAC RESISTIVE.
Relay 1 and Relay 2 level alarms are configurable for HIGH or LOW trip, for normally energized
(Failsafe) or normally de-energized and for latching or non-latching.
Relay 3 is always normally energized for failsafe operation so loss of power to the AMC-DTR
will be indicated as a “FAULT” condition. Relay 3 is always non-latching.
CAUTION:
Relays are rated for RESISTIVE loads. Inductive loads, such contactor coils or motors may
cause contact arcing, which emits RFI into the sensor signals. Use appropriate snubbers and
MOV’s across inductive loads and keep wiring away from signal wires.
4.6 Field Wiring Installation
Maximum Field Wiring Lengths
Maximum wiring run
with 250 Ohm Load
Maximum wiring
run with 250 Ohm
Load
Supply 10-32VDC Current@24VDC
18AWG 20AWG
Max Curent
with DTR-10-
0234 Option
@24VDC 18AWG 20AWG
DTR-EC 20mA 36000ft 23000ft 190mA 4850ft 3050ft
DTR-CAT
100mA
9200ft 5797ft 270mA 3400ft 2100ft
DTR-DS 120mA 7680ft 4830ft 290mA 3100ft 2000ft
DTR-ST 400mA 2340ft 1449ft 570mA 1600ft 1000ft
DTR-10-0234 option
includes three 5 AMP
Alarm Relays and RS-485
Modbus
For other field wiring setups, contact the factory for further information. Note when using
modbus communication feature total wire loops should not exceed 1000ft/300M remote power
supplies may be necessary for some configurations to ensure a minimum of 10VDC.

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4.6.1 2-Wire 4-20mA Mode Installation
Description:
The 2-wire current sinking transmitter is the easiest and most economical to install since there
are only two wires. All of the power needed comes from the current loop and wire sizes may be
smaller. However, only very low power applications are eligible for such transmitters. The
AMC-DTR Display assembly shown in Figure 5 consumes <2.5 mA of quiescent current. Toxic
and oxygen electrochemical sensors generate their own signals and therefore require no
additional current. If a 4-20mA output is all that is required for toxic / oxygen measurements (no
LCD backlight, alarms or RS-485) the AMC-DTR may be used in the 2-wire mode.
CAUTION:
It is important to understand the receiver, or controller device must supply the loop power in 2-
wire 4-20mA modes. Be sure the receiver to be used supports this type of operation.
Instructions:
Unscrew the cover on the AMC-DTR explosion-proof enclosure. Loosen the 2 thumbscrews
holding the display assembly in place and remove it. A small sensor cable is attached with
sufficient length to allow access to the back of the display assembly where 2 position TB1 is
located. Route the receiver wires through the conduit entry and connect to TB1. Steering
diodes in the AMC-DTR 2-wire 4-20mA output automatically correct for polarity so positive and
negative are interchangeable. Reassemble the AMC-DTR. Follow the procedures and
recommendations in the receiver manual to complete the installation. Be sure the AMC-DTR
enclosure and conduit are properly grounded. Apply loop power by appropriately powering the
receiver device (DCS, PLC, Controller, etc) and the AMC-DTR should function. Proceed to
section 5.
Figure 5: DTR-10-0232 Display / 2-Wire 4-20mA Assembly

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4.6.2 3-Wire 4-20mA Mode Installation
Description:
3-wire sourcing transmitters require an additional dedicated 24 VDC wire. The 4-20mA loop
current is then delivered, or sourced, from the transmitter output and the receiver device must
not provide 24 VDC from its input terminal. When the AMC-DTR is equipped with the bottom
DTR-10-0233 I/O Power Supply board shown in Figure 6, the 2-wire 4-20mA output is disabled
and one of the DTR-10-0233’s 3-wire outputs must be used. TB2 terminal 2 is for ECHEM toxic
/ oxygen 3-wire 4-20mA output signals and TB2 terminal 3 is for Catalytic bead 3-wire 4-20mA
output signals. See Figure 6 below.
Instructions:
Unscrew the cover on the AMC-DTR explosion-proof enclosure. Loosen the 2 thumbscrews
holding the display assembly in place and remove it. A small ribbon cable is attached with
sufficient length to allow access to the I/O PCB mounted in the bottom of the enclosure (Figure
6). Power and signal connections are to TB2 where 24 VDC, Signal and Common wires must
be connected. A blocking diode protects the AMC-DTR if polarity of the power supply is
reversed but it will not operate. Reassemble the AMC-DTR. Follow the procedures and
recommendations in the receiver and power supply manuals to complete the installation. Be
sure the AMC-DTR enclosure and conduit are properly grounded. Apply power and the AMC-
DTR should function. Proceed to section 5.
Figure 6: DTR-10-0233 I/O Power Supply / 3-Wire 4-20mA Assembly

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4.7 Alarms / RS-485 Modbus DTR-10-0234 Option Installation
Description:
The optional DTR-10-0234 Alarms/RS-485 Modbus board supplies two level alarm relays, a
FAULT relay and an RS-485 ModBus RTU slave port (Figure 7). This board is “piggybacked”
behind the DTR-10-0232 Display Assembly (Figure 5). Addition of this option requires 3-wire
mode 4-20mA operation and thereby requires the DTR-10-0233 I/O Power Supply board (Figure
6). This is since relays and RS-485 circuits require much more power than 2-wire 4-20mA loops
can deliver.
CAUTION:
Alarm relays have dry contacts and power must be supplied from an external source. Contacts
are rated for RESISTIVE loads! Inductive loads, such as contactor coils or motors, may cause
contact arcing, which shortens life and emits RFI into the sensor signals. Use appropriate
arcing snubbers and MOV’s across inductive loads and keep wiring away from signal wires.
External wiring to TB3 (Remote Alarm Reset) should be shielded and protected from noise
spikes to prevent false Alarm Reset.
Figure 7: DTR-10-0234 Alarm Relays / Modbus Option
Instructions:
Unscrew the cover on the AMC-DTR explosion-proof enclosure. Loosen the two thumbscrews
holding the display assembly in place and remove it. A small ribbon cable is attached with
sufficient length to access the back of the Display assembly where the Alarms/RS-485 Modbus
board option is located. It is possible to use only the relays, only RS-485, or use both. Relay
terminals are labeled NO (normally open), NC (normally closed) and C (common or the pole).
These designators correspond to the shelf, or de-energized, state of the relays. The FAULT
relay is always failsafe, meaning it is energized when there is not a fault condition and therefore
its action is reverse of the designators.
RS-485 Modbus networks should be wired as shown in Figure 8. Each AMC-DTR connected
represents an RTU and must have a unique RTU address. RTU addresses are assigned in the
Modbus setup menu described in section 7.10. Cabling must be a “daisy chain” as opposed to

AMC-DTR Sensor Transmitter User Manual
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a “star” pattern for reliable operation. The “end of line” unit should have J1 installed in the ‘A’
position for terminating resistor installation. All others should have J1 in the ‘B’ position. Front
panel Rx / Tx LEDs are helpful troubleshooting tools.
Figure 8: RS-485 Modbus Wiring
4.8 Isolated 4-20mA Output DTR-10-0250 Option
Description:
The optional DTR-10-0250 Isolated 4-20mA option (Figure 9) provides dual 4-20mA outputs that
are electrically isolated from sensor inputs and the 24 VDC power source. Each 4-20mA output
share the same common terminal and are not isolated from each other. This board is
“piggybacked” behind the DTR-10-0232 Display Assembly (Figure 5). Addition of this option
requires 4-wire mode 4-20mA operation and thereby requires the DTR-10-0233 I/O Power
Supply board (Figure 6).
Figure 9: DTR-10-0250 Isolated 4-20mA Output Option

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4.9 Sensor Installation (with Smart/Simple Sensor Definition)
3-wire electrochemical and catalytic bead sensors for toxic / oxygen and LEL combustible gas
detection are offer as an industry standard. These are referred to as Simple sensors. The
AMC-DTR design accommodates users wishing to continue use of their existing simple sensors
by accepting electrochemical types into TB2 of the DTR-10-0232 Display Assembly or catalytic
bead types into TB1 of the DTR-10-0233 I/O Power Supply (mounted to the bottom of the
enclosure). The AMC-DTR Smart Sensor interface also uses proven electrochemical
technology for toxic / oxygen and catalytic bead for LEL combustibles BUT has taken this
technology a step further. A tiny memory IC is incorporated into AMC-DTR factory supplied
Smart sensors allowing them to contain the entire database of AMC-DTR parameters onboard
the replaceable Smart Sensor assembly. This unique Smart Sensor Interface may be used to
configure smart sensors and / or AMC-DTR’s from a PC rather than entering all variables via the
magnetic keypad.
Electrochemical and catalytic bead smart sensors both plug into the Smart Sensor Housing
that connects to AMC-DTR electronics with its 8-conductor Smart Sensor Interface cable.
CAUTION:
Smart sensor housing with electrochemical toxic / oxygen sensors must connect to S1
located on the back of the DTR-10-0232 Display Assembly (See Figure 11). Smart
sensor housing with catalytic bead combustible sensors must connect to S1 located
on the optional DTR-10-0233 I/O Power Supply PCB assembly (See Figure 12).
The AMC-DTR design accommodates a range of sensor technologies, accepting
electrochemical types into TB2 of the DTR-10-0232 Display Assembly, solid state, IR or
catalytic bead types into TB1 of the DTR-10-0233 I/O Power Supply (mounted to the bottom of
the enclosure). The following sections show each.
When the Smart sensor is used, only the Sensor Module needs to be replaced when the sensor
needs replacement. To replace the Sensor Module, turn the power off, unscrew the sensor
housing cover from the sensor housing base (See Figure 10) and remove the sensor module.
Install the new sensor module and turn the power on. The AMC-DTR will power up and
configure with the new sensor module.
SENSOR HO SING COVER
SENSOR HO SING BASE
GRO ND WIRE
8-COND CTOR SMART
SENSOR INTERFACE CABLE
SENSOR MOD LE
Figure 10: Smart Sensor Housing Assembly

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4.9.1 Electrochemical Sensor Wiring to the DTR-10-0232 Display
Connect the simple electrochemical sensor to TB2 on the DTR-10-0232 Display board. Note the
colour of the wires for proper installation. Or connect the smart electrochemical sensor to S1 the
DTR-10-0232 Display board as shown in Figure 11.
Figure 11: Electrochemical Sensor Wiring to the DTR-10-0232 Display

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4.9.2 Catalytic Bead Sensor Wiring to the DTR-10-0233 I/O Power Supply
Connect the simple catalytic bead sensor to TB1 on the DTR-10-0233 I/O Power Supply board.
Note the colour of the wires for proper installation. Or connect the smart catalytic bead sensor to
S1 the DTR-10-0233 I/O Power Supply board as shown in Figure 12.
Figure 12: Catalytic Bead Sensor Wiring to the DTR-10-0233 I/O Power Supply