AMC AMC-UT M-400 Series User manual

AMC-UTx-M-xx-400 Series Digital Transmitter
1
UTx-M-400
Modbus RTU
Sensor/Transmitter
USER MANUAL
IMPORTANT:
Please read these installation and operating instructions completely
and carefully before starting.
Filename: 3550409A.docx
Copyright ©, 2022 AMC
The Armstrong Monitoring Corporation
215 Colonnade Road South, Ottawa, Ontario, Canada K2E 7K3
Tel: [phone] • Fax: [phone] • Canada & U.S. Toll Free: 1-800-465-5777
E-mail: [e-mail] • Internet: www.armstrongmonitoring.com

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TABLE OF CONTENTS
Section Title
Page
1GENERAL INFORMATION......................................................................................6
1.1 WARRANTY.......................................................................................................6
1.2 LIABILITY...........................................................................................................6
1.3 PRODUCT RETURN .........................................................................................6
1.4 CONTACT INFORMATION................................................................................6
1.5 MODIFICATIONS AND SUBSTITUTIONS.........................................................7
1.6 GLOSSARY .......................................................................................................7
2PRODUCT INFORMATION......................................................................................8
2.1.1 AMC-UTx-M-xx-0400 TRANSMITTER SPECIFICATIONS.................................... 9
2.1.2 SENSOR MODULE(S) SPECIFICATIONS..........................................................10
2.1.2.1 Carbon Monoxide .........................................................................................10
2.1.2.2 Carbon Monoxide/ Nitrogen Dioxide .............................................................11
2.1.2.3 Nitrogen Dioxide...........................................................................................12
2.1.3 ACCESSORIES...................................................................................................13
2.1.3.1 UTx Calibration Kit........................................................................................13
3PRODUCT DESCRIPTION ....................................................................................14
3.1 OVERVIEW......................................................................................................14
3.2 FRONT LID OVERVIEW..................................................................................15
3.3 REAR LID OVERVIEW ....................................................................................17
4INSTALLATION .....................................................................................................18
4.1 TRANSMITTER MOUNTING...........................................................................18
4.2 ACCESSORY MOUNTING..............................................................................20
4.2.1 Weathershield......................................................................................................20
4.2.2 Vandal Guard.......................................................................................................22
4.2.3 Pole Mounting Brackets.......................................................................................23
4.3 WIRING............................................................................................................24
4.3.1 POWER...............................................................................................................26
4.3.2 COMMUNICATION..............................................................................................26
4.3.2.1 End of Line (EOL) Setting.............................................................................27
4.3.2.2 Modbus Settings...........................................................................................29
5OPERATION AND CALIBRATION........................................................................30
5.1 STATUS LEDS.................................................................................................30
5.2 MENU OVERVIEW..........................................................................................32
5.2.1 UTx-M Menu System –Introduction.....................................................................32
5.2.2 UTx-M Menu System –Detailed Sensor Screen..................................................33
5.2.3 UTx-M Menu System –Detailed Status Screen...................................................33
5.2.4 UTx-M Menu System –Password Entry...............................................................34
5.2.5 UTx-M Menu System –Main Service Menu.........................................................34
5.2.6 UTx-M Menu System –Service Menu...................................................................35
5.3 TRANSMITTER CONFIGURATION.................................................................36
5.3.1 MODBUS SETTINGS..........................................................................................36
5.3.2 SENSOR MODULE CONFIGURATION AND ALARM SETTINGS.......................39
5.3.2.1 SENSOR MODULE WINDOW FILTER.........................................................39
5.3.2.2 SENSOR MODULE SENSOR CONFIGURATION........................................40

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5.3.3 TRANSMITTER ALARM SETTINGS ...................................................................43
5.3.4 RELAY SETTINGS..............................................................................................48
5.4 CALIBRATION.................................................................................................50
5.4.1 REQUIRED EQUIPMENT; EXCHANGE PROGRAM...........................................50
5.4.2 REQUIRED EQUIPMENT; ON-SITE CALIBRATION...........................................50
5.4.3 CALIBRATION PROCEDURE .............................................................................51
6MAINTENANCE.....................................................................................................56
6.1 GENERAL........................................................................................................56
6.2 SCHEDULED CALIBRATION..........................................................................56
6.3 SENSOR MODULE..........................................................................................56
6.3.1 SENSOR MODULE REPLACEMENT..................................................................56
6.3.1.1 REMOVE SENSOR MODULE......................................................................56
6.3.1.2 INSTALL SENSOR MODULE.......................................................................58
6.4 VERIFICATION OF OPERATION....................................................................59
6.4.1 SIMULATION OF GAS LEVELS..........................................................................59
7MODBUS REGISTERS..........................................................................................61
8TROUBLESHOOTING ...........................................................................................64
9SENSOR MODULE DEFAULT SETTINGS............................................................67
10 MENU FLOW DIAGRAMS..................................................................................68

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LIST OF FIGURES
Figure 2-1: UTx Calibration Kit..................................................................................................13
Figure 3-1: Front Lid .................................................................................................................15
Figure 3-2: Front Lid Rear View................................................................................................17
Figure 4-1: Enclosure Mounting ................................................................................................19
Figure 4-2: Weathershield Mounting - Step 1............................................................................20
Figure 4-3: Weathershield Mounting - Step 2............................................................................20
Figure 4-4: Weathershield Mounting - Step 3............................................................................21
Figure 4-5: Vandal Guard..........................................................................................................22
Figure 4-6 Enclosure Pole Mounting.........................................................................................23
Figure 4-7 Example of connections to a 120VAC AMC-1DB1-3XXXX Digital Monitor...............25
Figure 4-8: Disconnecting BusPower Module............................................................................27
Figure 4-9: Removing BusPower Module..................................................................................28
Figure 4-10: EOL Switch...........................................................................................................28
Figure 4-11: Replacing BusPower Module................................................................................29
Figure 6-1: Disconnect Sensor Module .....................................................................................57
Figure 6-2: Removing Sensor Module from Lid.........................................................................57
Figure 6-3: Installing Sensor Module.........................................................................................58
Figure 6-4: Attaching Cable to Sensor Module..........................................................................58
Figure 10-1: Main Screen / Password Flow...............................................................................68
Figure 10-2: Sensor Service Menu Flow Diagram.....................................................................69
Figure 10-3: UTx Service Menu Flow Diagram..........................................................................70
Figure 10-4: MODBUS Menu Flow Diagram .............................................................................71
Figure 10-5: Sensor Configuration Menu Flow Diagram............................................................72
Figure 10-6: Alarm Menu Flow Diagram....................................................................................73

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LIST OF TABLES
Table 4-1 Units vs Gauge/Distance...........................................................................................26
Table 5-1 Status LEDs..............................................................................................................30
Table 5-2: Service Menu Options..............................................................................................35
Table 5-3: Modbus Menu Options.............................................................................................36
Table 5-4: Parity Menu Options.................................................................................................38
Table 5-5: Sensor Module Sensor Configuration Menu.............................................................40
Table 5-6: Sensor Alarm Configuration.....................................................................................41
Table 5-7: Calibration Frequency Configuration........................................................................42
Table 5-8: Transmitter Alarm Settings.......................................................................................43
Table 5-9: Transmitter Alarm Sub-Menu Settings......................................................................44
Table 5-10: Alarm Input Options ...............................................................................................45
Table 5-11: Alarm Setpoint Options ..........................................................................................45
Table 5-12: Alarm Type Options ...............................................................................................46
Table 5-13: Relay Menu............................................................................................................48
Table 5-14: Relay Sub-Menu ....................................................................................................48
Table 5-15: Relay Polarity Menu...............................................................................................49
Table 5-16: Calibraiton Menu....................................................................................................51
Table 5-17: Calibration States...................................................................................................53
Table 7-1 Modbus Registers.....................................................................................................62
Table 8-1 UTx-M Troubleshooting Table...................................................................................64
Table 9-1: Sensor Module Default Alarm Settings.....................................................................67
Table 9-2: Sensor Module Default Settings...............................................................................67

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1GENERAL INFORMATION
1.1 WARRANTY
The AMC-UTx-M-xx-0400 Digital Transmitter 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 unless covered under site contract. 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)
or through contacts at www.armstrongmonitoring.com
1.2 LIABILITY
All AMC products must be installed and maintained according to instructions. Only qualified
personnel should install and maintain the equipment. The AMC-UTx-M-xx-0400 Digital
Transmitter must not be located in hazardous locations where combustible gases could be 100%
LEL(potentially explosive environments).
AMC shall have no liability arisingfrom auxiliary interfaced equipment, for consequential damage,
or the installation and operation of this equipment. AMC shall have no liability for labor 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.
1.3 PRODUCT RETURN
All products returned for warranty or service should be shipped by prepaid freight and will be
accepted only with RMA or repair number issued by AMC. All products returned to the client will
be shipped by freight collect.
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].

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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.
1.6 GLOSSARY
Alarm
Alarm is an audible, visual, or physical
presentation designed to warn the instrument user
that a specific level of a dangerous gas/vapor
concentration has been reached or exceeded.
Calibration
Calibration is the procedure used to adjust the
instrument for proper response.
Calibration Gas
Calibration Gas is a gas of known
concentration(s) used to set the instrument span.
Catalytic needs air for calibration.
DT
Digital Transmitter
Gas Concentration
Gas Concentration is measured in:
•PPM
•%LEL (Lower Explosive Limit)
LEL
Lower explosive limit is the lowest concentration
(percentage) of a gas or a vapor in air capable of
combusting in the presence of an ignition source
(arc, flame, heat).
PPM
Parts Per Million (1% volume = 10,000PPM)
Percent by volume
Concentration of gas in a mixture expressed as a
percentage of total volume.
Span
Full range of a sensor i.e. a CO sensor with a full
range of 0-100 PPM has a 100 PPM span.
T90
Response Time in seconds to achieve 90% gas
concentration reading. This a typical calibration
point that allows for sensor aging, but tends to be
less accurate than a T99 calibration,
T99
Response Time in seconds to achieve 99% gas
concentration reading. This is a more accurate
calibration point.
Zero Buffering
Zero buffering is transmitter function which
forces the gas concentration reading to zero when
sensor is exposed to low concentration of a gas.
The zero buffer is indicated in the sensor
specification.
Zero Gas
Zero gas is gas in which the target gas is not
present. The presence of oxygen is required.
Clean air is an excellent source for zero
calibration. A known gas concentration can be
entered during zero calibration.

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2PRODUCT INFORMATION
The AMC-UTx-M-xx-0400 Series Digital Transmitter consists of the Transmitter assembly plus up
to two Sensor Modules that can each support single or dual sensor configurations. The
Transmitter communicates with a monitor (i.e. AMC-1DBx) over RS-485 using MODBUS/RTU.
The Sensor Module acquires data from an electrochemical gas sensor and communicates its gas
concentration to the transmitter. The UTx-SM Sensor Module can be replaced in the field and is
eligible for the EZ-CAL calibration exchange program.
Note:
All Armstrong Monitoring systems must be installed and maintained according to
instructions to assure proper operation. Only qualified personnel should install and
maintain the equipment. For exchange, re-calibration or extended warranty programs
information please call 1-800-465-5777 or through contacts at
www.armstrongmonitoring.com

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2.1.1 AMC-UTx-M-xx-0400 TRANSMITTER SPECIFICATIONS
AMC-UTx-M-xx-0400
Transmitter Order Number...
AMC-UTx-M-91A01-98A01-R-0400
(UTx Modbus 400, 2 Sensor Modules, CO 0-100ppm, NO2 0-10ppm, Relay)
AMC-UTx-M-91B01-98A01-R-0400
(UTx Modbus 400, 2 Sensor Modules, CO 0-300ppm, NO2 0-10ppm, Relay)
AMC-UTx-M-VCA01-N-R-0400
(UTx Modbus 400, 1 Dual Sensor Module, CO 0-100ppm, NO2 0-10ppm, Relay)
AMC-UTx-M-91A01-N-R-0400
(UTx Modbus 400, 1 Sensor Module, CO 0-100ppm, Relay)
AMC-UTx-M-91B01-N-R-0400
(UTx Modbus 400, 1 Sensor Module, CO 0-300ppm, Relay)
AMC-UTx-M-98A01-N-R-0400
(UTx Modbus 400, 1 Sensor Module, NO2 0-10ppm, Relay)
Power Supply Requirement
24 VDC, 40mA
Relay
SPDT, 30 VDC, 2 A (resistive)
Warranty
2 Years
Operating Temperature
-20° to 40° C
Operating Pressure
0.9 to 1.1 atm
Relative Humidity
15 to 90% RH, non-condensing
Signaling
Modbus RTU
9600 Baud, 8bit, Even Parity.

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2.1.2 SENSOR MODULE(S) SPECIFICATIONS
2.1.2.1 Carbon Monoxide
Gas Type………………………………….….…..
CARBON MONOXIDE (CO)
Sensor Module Order Number….……
AMC-SM-91A01 (0-100ppm)
AMC-SM-91B01 (0-300ppm)
Operating Temperature ………………………
-20° to 40° C
Sensor Height Above Finished Floor (as part
of Digital Transmitter)
4-6 Feet (1.22-1.52m)
Sensor Life…….…………………………………
Up to 6 Years
Sensor Warranty………………………………..
2 Years
Range …………………………...……………
See Above
Zero Buffering of Display……………………..
<5ppm
Calibration Kit Part Number…………………..
AMC-C1-FM1
Default Calibration Gas……………………….
100ppm CO
Gas Flow Rate…………………………………..
0.5L/min.

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2.1.2.2 Carbon Monoxide/ Nitrogen Dioxide
Gas Type………………………………….….…..
CARBON MONOXIDE (CO) / NITROGEN
DIOXIDE (NO2)
Smart Sensor 2 Module Order Number….……
AMC-SM-VCA01
Operating Temperature ………………………
-20° to 40° C
Sensor Height Above Finished Floor (as part
of Digital Transmitter)
4-6 Feet (1.22-1.52m)
Sensor Life…….…………………………………
Up to 2 Years
(CO element up to 6 years)
Sensor Warranty………………………………..
2 Years
Range …………………………...……………
0-100ppm CO
0-10ppm NO2
Zero Buffering of Display……………………..
<5ppm C2
<0.5ppm NO2
Calibration Kit Part Number…………………..
AMC-C1-FM1
Default Calibration Gas……………………….
100ppm CO
10ppm NO2
Gas Flow Rate…………………………………..
0.5L/min.

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2.1.2.3 Nitrogen Dioxide
Gas Type………………………………….….…..
NITROGEN DIOXIDE (NO2)
Smart Sensor 2 Module Order Number………
AMC-SM-98A01
Operating Temperature ……………………….
-20° to 40° C
Sensor Height Above Finished Floor(as part of
Digital Transmitter)
4-6 Feet (1.22-1.52m)
Sensor Life…….…………………………………
Up to 2 Years
Sensor Warranty………………………………..
2 Years
Range …………………………………………
0-10ppm
Zero Buffering of Display……………………..
<0.5ppm
Calibration Kit Part Number……………
AMC-C1-FM1
Default Calibration Gas……………………….
10 ppm NO2
Gas Flow Rate…………………………………..
0.5L/min.

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2.1.3 ACCESSORIES
The following accessories are available for use with the AMC-UTx Digital Transmitters
Accessory Description
Order Code
Notes
Weathershield for AMC
Transmitters
AMC-WS00-SL
Refer to 4.2.1 for mounting
instructions
Vandal Guard Universal fit
AMC-VG-XL
Refer to 4.2.2 for mounting
instructions
Pole Mounting Brackets
included with each
transmitter
Refer to 4.2.3 for mounting
instructions
Calibration Kit
AMC-C1-FM1
Refer to 2.1.3.1 for details
Calibration Adaptor
AMC-FM1
Refer to 2.1.3.1 for details
2.1.3.1 UTx Calibration Kit
The UTx Calibration Kit, as shown below, consists of the AMC-FM1 Calibration Adaptor that
secures the calibrationgas hose to thefront of theUTx Sensor Module along with hose to connect
to the calibration gas cylinder regulator.
Figure 2-1: UTx Calibration Kit

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3PRODUCT DESCRIPTION
The AMC-UTx Digital Transmitter is designed to provide continuous, reliable monitoring of
ambient air for the target gas SENSOR MODULE(S) SPECIFICATION (Section 2.1.2). It provides
a digital representation of the gas concentration detected. This information is both displayed
locally (via OLED) and sent to the respective Monitor upstream.
Plug-and-play modular architecture accommodates; hot-pluggable Power/Comms via the
BusPower Module (see Figure 4-11), detachable lid assembly when commissioning and field
replaceable Sensor Modules for the EZ-CAL exchange program.
Each Transmitter features alarm indicators, an on-board relay and connection terminal blocks, as
listed and described herein.
3.1 OVERVIEW
The AMC-UTx Digital Transmitter consists of three main components;
•PC-ABS Enclosure,
•UTx Lid Assembly,
•Sensor Module.

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3.2 FRONT LID OVERVIEW
2Display
1
Enclosure Lid
3
Network
Status LED
5
Sensor
Module
7Menu
Buttons
6
Sensor
Module LED
4Sensor Status
LED
Figure 3-1: Front Lid

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1. Enclosure:
Enclosure and Lid Assembly, PC-ABS blend, 5.45”length
by 6.14” width Wall mount with two mount points. Option for
Pole Mount.
2. Digital Display:
Displays gas concentration & Status information
3. Network Status LED:
Indicates status of Network Interface and will show whether
or not the UTx has established / maintained Network
Communication
4. Sensor Status LED:
The Sensor Status LED will show the same error code that
is being communicated by the Sensor Module(s) or display
the highest priority error (if multiple errors codes are being
communicated to it by the Sensor Module(s)
5. Sensor Module Opening:
This inlet allows target gas to flow into the sensor. The inlet
is also used for gas calibration.
6. Sensor Module LED:
Sensor Module LEDs will show the status of the sensor
element within the Sensor Module, or the status of the
Sensor Module itself
7. Menu Buttons:
Momentary Pushbuttons for user Interface.

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3.3 REAR LID OVERVIEW
Figure 3-2: Front Lid Rear View
8. BusPower Connectors:
The two 12 pin connectors on the BusPower Module provide
all interfaces to the UTx-M-xx-400.
9. Sensor Module Connections:
Connectors on the Sensor Module(s) are used to connect
between Sensor Modules and between Sensor Module 1
and the Transmitter
10. EOL LED
This LED will be illuminated Green if the UTx is configured
as EOL
10 EOL LED
8
BusPower
Connectors
9Sensor Module
Connections

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4INSTALLATION
The installation of the AMC-UTx-M-xx-400 Digital Transmitter is very important as the operational
quality is a direct result of the quality of the installation. The following sections provide guidelines
for installation; location and mounting, wiring, and cable selection.
4.1 TRANSMITTER MOUNTING
Mount the AMC-UTx-M-xx-400 Digital Transmitter on a solid, non-vibrating surface or structure.
Mount in an area where the ambient concentration of gas is not directly affected by the presence
of clean air supply, ventilation systems, or blockage by surrounding articles. Locate away from
sources of interference gases. If the main objective is the fastest possible leak detection, mount
the sensor near the potential leak sources. Please, refer to local codes forinstallation information.
The installer is required to provide any mounting hardware that may be required.
In order to mount the AMC-UTx-M-xx-400:
1. Remove cover.
2. Mount housing using defines mounting holes. See Figure 4-1: Enclosure Mounting and
Figure 4-6 Enclosure Pole Mounting.
3. Drill holes for conduit and then install conduit. See Warning below.
4. Reattach cover and bracket.
Warning:
The transmitter should not be placed near cleaning products/solvents, particularly
ones that contain alcohol. This can permanently damage sensor elements or cause
negative output values.
Conduit should enter the housing from the bottom to ensure best protection against
ingress of condensation.
Conduit entry from the top or back of the housing is Not Recommended. Any water
damage related to conduit entry from the top or back will not be covered under
warranty.
Qualified personnel should perform the installation according to applicable electrical
codes, regulations and safety standards. Insure correct cabling practices are
implemented.
Mount all equipment away from any source of electro-magnetic interference (EMI) or radio
frequency interference (RFI) such as power transformers, electric motors, etc.
Equipment must be positioned such that the chance of water damage is minimized; Example
away from fire suppression sprinkler heads, away from wet or damp locations where there would
be risk of water damage.
Ensure a balanced layout of sensors to cover the intended area.

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Refer to Section 4.2 If the transmitter is to be mounted on a pole, in a location where water
spraying or splashing could be an issue, on in locations where a vandal guard is required.
Notes:
Mount enclosure as shown in Figure 4-1. This will ensure correct orientation.
Figure 4-1: Enclosure Mounting

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4.2 ACCESSORY MOUNTING
4.2.1 Weathershield
Note that the Weathershield assembly is compatible with both wall and pole mounting
configurations. To install the Weathershield follow these steps.
Place the bracket assembly behind the Transmitter.
Mount the Bracket Assembly, and Transmitter to the wall or pole. (Mounting Screws not
included)
Figure 4-2: Weathershield Mounting - Step 1
Figure 4-3: Weathershield Mounting - Step 2