Aquametro AOM-CMT45 Installation manual

Version: VD 7-827e 03.2022
Installation & Startup Guide
AOM-CMT45
Coriolis Transmitter

2 AOM-CMT45 – Coriolis Transmitter
Content
1General Information..................................................................................................................... 3
1.1 Important Safety Instructions for operating Coriolis Flowmeters....................................................................................3
1.2 Manufacturer’s Liability.....................................................................................................................................................................3
1.3 Additional Resources .........................................................................................................................................................................3
2Quick Start .................................................................................................................................... 3
3Installation .................................................................................................................................... 4
3.1 Mechanical Installation......................................................................................................................................................................4
3.2 Electrical Installation...........................................................................................................................................................................4
Connectors.......................................................................................................................................................................................4
Power Supply and Grounding..................................................................................................................................................6
Control Inputs and Outputs......................................................................................................................................................7
4Operation and Configuration...................................................................................................... 8
4.1 Operating elements............................................................................................................................................................................8
External..............................................................................................................................................................................................8
Internal operating elements .....................................................................................................................................................9
Zero offset calibration w/o interface.....................................................................................................................................9
4.2 Operation and configuration via display................................................................................................................................. 10
Function of the push buttons................................................................................................................................................ 10
Passcodes and menu selection............................................................................................................................................. 11
Zero offset calibration..............................................................................................................................................................11
Change of positive flow direction........................................................................................................................................ 12
Input/Output configuration ................................................................................................................................................... 13
Internal system time.................................................................................................................................................................. 16
5Remote Operation...................................................................................................................... 17
6Service and Maintenance........................................................................................................... 18
6.1 Maintenance and Calibration....................................................................................................................................................... 18
6.2 Supervision and Troubleshooting..............................................................................................................................................18
6.3 Service...................................................................................................................................................................................................24
6.4 WEEE and RoHS.................................................................................................................................................................................24
Appendix A Technical Information ................................................................................................ 25
A.1 Technical Data....................................................................................................................................................................................25
A.2 Mechanical Drawing........................................................................................................................................................................ 26

AOM-CMT45 – Coriolis Transmitter 3
1 General Information
1.1 Important Safety Instructions for operating Coriolis Flowmeters
The AOM-CMT45 transmitter model is integrated in all AOM-CM flow sensors. Maximum
temperature limits for each AOM-CM flow sensor are stated on the permanently attached
serial number plate and must not be exceeded.
The closed transmitter box provides a protection class of at least IP66.
The use of a properly grounded supply is highly recommended.
The use of shielded cables for all I/O signals is recommended to prevent interference from
high level EMI.
For safety instructions regarding AOM-CM Coriolis Flow Sensors, please refer to the AOM-
CM installation and start-up guide manual.
These measuring instruments are not designed for, and should not be installed in, life-
preserving systems used in the medical, motor vehicle, aircraft, water craft or mining
industries.
All national regulations and standards regarding electrical installation must be observed!
1.2 Manufacturer’s Liability
Aquametro Oil & Marine assumes no liability for loss and/or consequential damages
stemming from the use of this product utilized in life-preserving systems in the medical,
motor vehicle, aircraft, water craft or mining industries.
Aquametro Oil & Marine accepts no liability for loss or damage resulting from the improper
use of any of its products.
Aquametro Oil & Marine assumes no liability for the loss of production and/or consequential
damage from the use of this product unless such liability has been expressly and
contractually agreed.
Aquametro Oil & Marine provides a standard one year from shipment warranty on all
products for workmanship and materials.Performance of this warranty will be at the
Aquametro Oil & Marine manufacturing facility.
Aquametro Oil & Marine assumes no liability for determining the suitability of its products in
any specific application. This is the sole responsibility of the end user.
1.3 Additional Resources
Since this document mainly describes the installation and commissioning of the AOM-CMT45 transmitter it does
not contain all information related to the configuration of the transmitter and its features. These items are
described extensively in the AOM-CMT45 Operation & Configuration Manual (VD 7-828e 02.2022). Manuals and
further resources are available for download from the Aquametro Oil & Marine website:
www.aquametro-oil-marine.com
2 Quick Start
Carry out the following steps to prepare the flow meter for operation:
1) If not already done, install the AOM-CM sensor in line (refer to the AOM-CM Coriolis Sensor Installation
Guide for additional information on mechanical installation).

4 AOM-CMT45 – Coriolis Transmitter
2) Connect all signal input, output and communications interface wiring as required (section 3.2.3).
3) Connect power supply (section 3.2.2).
NOTE!
For safety, always connect the protective ground.
4) Switch on the power supply. The “READY” LED will light up (only visible when transmitter enclosure is
opened).
5) Flush the AOM-CM flow sensor with process fluid and ensure that it is free of air bubbles (in case of a
liquid process fluid) or liquid droplets (in case of a gaseous process fluid).
6) Wait until the AOM-CM temperature has stabilized and then carry out a zero-point calibration (section
4.3):
Ensure a zero-flow condition is present in the flow sensor by closing isolation valves
Initiate zeroing of the sensor and wait for the zeroing procedure to complete
Open isolation valves to allow flow through the sensor
The device is ready for operation.
3 Installation
3.1 Mechanical Installation
The AOM-CMT45 is connected to the AOM-CM ex works and cannot be removed.
For mounting the AOM-CM refer to the corresponding manual delivered with the AOM-CM.
When hot fluids are to be measured the housing of the AOM-CMT45 transmitter must not be
thermally isolated from the ambient for avoiding overheating the electronics.
When planning the mechanical installation please leave at least 12.5 cm/5 inch space for the M12 plugs and the
attached cables at the side where the M12 sockets are located.
Technical data and mechanical drawings can be found in Appendix A.
3.2 Electrical Installation
CAUTION
The surface of the AOM-CMT45 may be hot if a hot fluid is running through the AOM-CM
sensor.
Any cable used for connecting to the AOM-CMT45 transmitter must be specified for 80°C or higher.
The use of shielded cable is strongly recommended.
Connectors
The AOM-CMT45 has one 12-pin M12 connector, “A” coded, for power supply and standard interfaces and one
8-pin M12 connector, “A” coded for high-speed interfaces of Ethernet 100base TX type.
With the I/O configurations B1, S1, S2, P1, and P2 the 8-pin socket is internally not connected.
The 8-pin M12 connector is not included in the standard scope of supply.
As accessories Aquametro Oil & Marine offers readily configured cables.

AOM-CMT45 – Coriolis Transmitter 5
3.2.1.1 12-pin M12 Connector
The 12-pin M12 connector of the AOM-CMT45 provides power supply, RS485 interface, digital outputs, digital
input, and the analog 4-20mA interfaces.
CAUTION
Before connecting the 12-pin M12 socket please check that the power supply is correctly
connected to the pins 1 and 3 of the 12-pin M12 plug to prevent damage.
The following figures show the pin numbering of the 12-pin M12 socket in the AOM-CMT45 transmitter and a
respective plug.
Fig. 1: Pin numbering of the AOM-CMT45 12-pin M12 socket
Fig. 2: Pin numbering of an 12-pin M12 plug
Table 2: Pin configuration of the 12-pin M12 socket
Pin #
Signal
I/O Option
Remark
Circuit diagram
1
+24V
all
Positive supply terminal
2 AO1-
S1, S2, P1,
or P2
Negative terminal for analog output 1
3
0V/GND
all
Ground for power supply
4 RS485- all
Negative signal of the two-wire
RS485 interface
5 DO1 all
Digital output 1 (called channel 0/A in
the Modbus documentation)
6 RS485+ all
Positive signal of the two-wire RS485
interface
7
DI1
all
Digital input 1
8 DO2 all
Digital output 2 (called channel 1/B in
the Modbus documentation)
9 AO1+
S1, S2, P1,
or P2
Positive terminal for analog output 1
10
I/O GND
all
Ground for digital in- and outputs
11
AO2+
S2, or P2
Positive terminal for analog output 2
12
AO2-
S2 or P2
Negative terminal for analog output 2
Shield
Ground / PE
all
3.2.1.2 8-pin M12 Connector (not included in standard scope of supply)
The 8-pin M12 connector is only connected internally, if one of the following options is installed:
EA, EB
Modbus TCP
EN EtherNet/IP
EP
ProfiNet
DP
Profibus DP
EC
EtherCAT
Top view
plug
Top view
socket

6 AOM-CMT45 – Coriolis Transmitter
The drawing shows the pin numbering of an 8-pin M12 connector. The function of the pins for the different
options is described in chapter 5.
Fig. 3: Pin numbering of the AOM-CMT45 8-pin M12 socket
Fig. 4: Pin numbering of an 8-pin M12 plug
Power Supply and Grounding
For connections longer than 0.5m shielded cables should be used. For connections longer than 3m, additional
ferrite filter beads close to the AOM-CMT45 are recommended for avoiding RF EMI.
The power supply input is protected by a fuse. As a protection against fire in case of a short in the cable, the
supply side of the cable should be protected by a fuse (see figure 5, SI1) with a rating not higher than the
current carrying capacity of the cable.
The ground signal of the AOM-CMT45 (Terminal 3 and 10 of the 12 pin M12 connector) is connected to PE and
housing via a 10kΩ resistor.
The cables used for power supply and grounding must comply with the national requirements. If
required, certified cables must be used. The minimum cross section is 0.35mm² (AWG 22).
The AOM-CMT45 does not contain a mains switch. A switch or circuit breaker close to the AOM-
CMT45 must be included in the supply line. The switch must be marked correspondingly.
3.2.2.1 Grounding and shielding
An AOM-CM sensor with an AOM-CMT45 transmitter must be grounded. Refer to the manual of the AOM-CM
sensor for the position of the ground terminal.
The cross-sectional area of the grounding wire must be equal to or larger than the conductors used for any
supply or I/O connection.
NOTE!
National and local electrical code requirements may contain additional grounding requirements.
Please ensure that all grounding is carried out according to these [legal] requirements.
For connections longer than 0.5m shielded cables should be used. For best EMC performance the shield should
be connected on both ends of the cable. If the shield cannot be connected on both ends due to potential
differences between PE on both ends, one end might be connected to PE via a 1nF capacitor on one end.
3.2.2.2 Power Supply
The AOM-CMT45 requires a regulated DC supply voltage of
12V or 24V. It will operate with a power supply in the range
10V to 28V.
Connect the positive supply to terminal 1 and 0V to terminal
3 of the 12-pin M12 connector.
Terminal 3 (0V) and housing (PE) are connected via a 10kΩ
resistor. The resistor can withstand a potential difference of
up to 30V between 0V and PE, but voltage differences above
5V should be avoided. For best EMC performance connect
the supply ground to PE close to the AOM-CMT45.
Top view
socket
Top view
plug
Figure
5: DC power supply

AOM-CMT45 – Coriolis Transmitter 7
Control Inputs and Outputs
In general, shielded cables should be used for cable connections longer than 0.5m. For cable connections longer
than 3m, it is recommended that ferrite filter beads are installed close to the AOM-CMT45 terminations to help
avoid RF EMI.
3.2.3.1 Digital Outputs
The AOM-CMT45 has two universal digital outputs which can be used as frequency, pulse or control/status
outputs.
Digital outputs are push-pull outputs compliant to IEC 60946 (potential-free). They can drive loads connected to
ground and loads connected to +24V.
Figure 6: Digital Outputs
Connect the output of the AOM-CMT45 to the load. Connect the other side of the load to either GND or to the
positive supply rail. With a grounded load, the output current should be limited to 20mA (480mW at 24V). With
a load connected to the positive supply rail the output can drive up to 50mA (1.2W at 24V).
The output can drive relays directly as well. Relays should be connected between the output and the positive
supply rail.
Figure 7: Digital output with relays

8 AOM-CMT45 – Coriolis Transmitter
The maximum output current is internally limited to 50 mA. If the output current exceeds this limit due to a too
low load resistance, the output will be disabled automatically.
3.2.3.2 Digital Inputs
AOM-CMT45 transmitters have one or two IEC60946 compliant digital inputs (potential-free).
Digital inputs have an input resistance of 24 kΩ and when operated, will draw approx. 1 mA when connected to a
24 VDC supply.
Figure 8: Digital inputs
Digital inputs can be operated with an active DC signal instead of a switch. The maximum input voltage must not
exceed 30 VDC. The required input voltage for a low-high transit is typically 11 V, maximum 12.5 V, corresponding
to an input current of about 0.5mA.
The digital input 2 is not available in standard scope of supply.
4 Operation and Configuration
4.1 Operating elements
External
Figure 9: AOM-CMT45 enclosure in standard orientation
If the 8-pin M12 connector is not used, it must be closed with the protection cap delivered with the AOM-CMT45
for maintaining the ingress protection.
M12 8-pin socket
M12 12-pin socket
Display with control keys

AOM-CMT45 – Coriolis Transmitter 9
Internal operating elements
When the cover of the AOM-CMT45 enclosure is removed a part of the electronics becomes accessible which
contains some user configurable elements, e.g.:
1. Mini USB socket
2. Status LEDs, green (ON), yellow (Hard Lock switch active), red (ERROR)
3. Hard Lock switch (option)
4. RS485 termination switch
5. Push button “ZERO”
6. Power supply fuse
7. Display with control keys (optionally)
Figure 10 depicts the AOM-CMT45 transmitter without display when the cover is open.
When opening the cover of the AOM-CMT45 enclose make sure that no fluids enter the
enclosure and observe basic EMC measures such as connecting yourself to the earth potential
of the enclosure.
Figure 10 also shows the switch positions for the activation or deactivation of the RS485 termination and the
Hard Lock switches. The activation of the Hard Lock switch also will be shown by the yellow LED being lit. In this
case no modification of setup parameters is possible.
Figure 10: AOM-CMT45 with open enclosure
Zero offset calibration w/o interface
After installation of the AOM-CM sensor with AOM-CMT45 transmitter a zero calibration is strongly
recommended.
Flush the AOM-CM with the fluid to be measured and make sure that the sensor is 100% filled.
Operate the AOM-CMT45 for at least 15 minutes for warming up.
Open the top cover of the AOM-CMT45 by removing the 4 screws in the corners of the top cover.
Stop the flow and make sure that there is no more flow. For best results a valve in front and behind the
AOM-CM would be recommended.
Press the push button “ZERO” with a tool (screwdriver, pencil) for about 2 seconds. The red and the green
LED star flashing.
When the flashing stops and the green LED lights constantly reclose the top cover.
Reopen the valves.
Make sure that the top cover gets properly closed for achieving the IP protection.
The AOM-CMT45 must not be opened in wet or dirty (dusty) ambient or when the housing of the
AOM-CMT45 is wet.
ON
INACTIVE
1
2
3
5
6
OFF
4
ACTIVE

10 AOM-CMT45 – Coriolis Transmitter
4.2 Operation and configuration via display
Optionally, the AOM-CMT45 transmitter has a user operation interface consisting of a color LCD screen and
three push buttons. The screen and push buttons are used to navigate through a hierarchical menu structure
that logically and intuitively organizes the various features and functions available within the programming set
supplied with the instrument. This chapter gives a short introduction into operation of the AOM-CMT45 through
the front panel user interface. For more detailed information, please refer to the AOM-CMT45 Operation &
Configuration Manual.
Function of the push buttons
AOM-CMT45 transmitters can be operated through three front panel push buttons. These are labeled “ESC” [X],
“NEXT” [>], and “ENTER” []. The function of these push buttons depends upon the currently displayed screen.
The following table details button function in specific situations.
Table 3: Functions of the push buttons
Button
Situation
Function
ESC
Menu Navigation
Navigates to the menu one level up
Number Input
Exits number input field and returns to the associated menu window
without saving any changes
NEXT
Menu Navigation
Selects the next menu item
During Number
Input
Increments the number at the cursor position by one. Number increment
is circular: a ‘9’ increments to ‘0’ for decimal numbers, ‘F’ increments to
‘0’ for hexadecimal numbers (used for service password)
Number Sign
Change
Changes ‘+’ to ‘-’ and vice versa. When entering a number with a sign
character, the cursor will start at the first number character to the right
of the sign character in the field. In order to reach the sign character, it
is necessary to traverse all the way to the rightmost character and then
start at the beginning of the input field again
Decimal Point
Position Change
Shifts the decimal point and cursor position one place to the right
End of input line The entire number will flash upon pressing ENTER at the rightmost
character in an input field. Pressing NEXT when the field is flashing will
return the cursor to the start of the input line
ENTER
Menu Navigation
Navigates to the menu one level down or enters an input screen
During Number,
Sign or Decimal
Point entry/
change
Moves the cursor one character to the right in an input field. Note that
when a number is entered that is not in the parameters’ acceptable
range, the field will change to inverse colors (light on dark instead of
dark on light). When a number is not within an acceptable range,
pressing ENTER at the rightmost character in the field will return the
cursor to the leftmost position in the field for re-editing.
Number Input at
the End
Pressing ENTER at the rightmost character in the field will cause the
entire field to flash. Pressing ENTER again will commit the modified
number and return display to the associated menu window
Status Info’s - Bit
Status Displays
Increment the index of individual bits in the status words. Successively
pressing ENTER in the Error Status, Soft Error Status, or Warnings items
will allow display/read of each individual bit value and its status
description

AOM-CMT45 – Coriolis Transmitter 11
For example, and as depicted in Figure 11, when navigating the menu structure, press the ENTER push button
once to get from the main display screen to the top-level menu selection. Press the NEXT button repeatedly to
scroll through the entire menu. To enter any specific menu, press ENTER.
Figure 11: Example – AOM-CMT45 top level menu selection
Passcodes and menu selection
To configure and carry out certain functions in an AOM-CMT45 transmitter, it is necessary to enter a
predetermined passcode. Passcodes protect configuration setup and prevent inadvertent changes to the flow
meter operating condition. There are two different access levels with separate passcodes: “USER” and “SERVICE”.
The USER level accesses those functions that relate to the operation of the flow meter on a day-to-day basis i.e.,
zeroing and totalizer reset. The SERVICE level allows access to configuration and setup functions such as I/O
ranging and calibration.
When needed, the screen will prompt for a passcode. Passcodes are entered using the NEXT and ENTER buttons.
Once entry is complete, the entire passcode will flash. Press ENTER again to enter the menu. If the passcode
supplied is incorrect, the cursor will return to the leftmost character of the passcode for re-entry.
Factory default passcodes are shown in Table 4. The USER level passcode can be changed by accessing the
“Service Login” menu.
Table 4: Default passcodes
Access Level
Passcode
User
1111
Service
5678
Zero offset calibration
Before carrying out a zero-offset calibration, make sure that there is a zero-flow condition in the AOM-CM
sensor i.e. valves have been closed upstream and downstream of the AOM-CM meter body.
Navigate to the “Zero Now” menu item as shown in Figure 12 to perform the zeroing procedure. It will be necessary
to enter the user passcode (see section 4.2.2).
Main Screen

12 AOM-CMT45 – Coriolis Transmitter
Figure 12: AOM-CMT45 Menu - Zero offset calibration
To perform the zeroing procedure, press NEXT at the Y/N confirmation screen to change the “N” to “Y”. Press
ENTER to start the procedure or ESC to cancel. Once started, a countdown timer will begin. When it reaches 0,
the zero offset calibration procedure is complete. Return back to the main screen by pressing the EXIT push
button twice.
Change of positive flow direction
AOM-CM mass flow meters are bi-directional and can operate with flow passing through them in any direction.
In some cases, after installation, the transmitter may read negatively because of orientation. In this case, the flow
direction indication can be reversed within the transmitter. To change the positive flow direction, navigate to the
“Phase Measurement” menu item under Service Login (Figure 13).
Change the value of the “PhsFlwDirConfig” parameter from “0” to “1” (or vice versa) to change the flow direction
indication of the transmitter.
Figure 13: AOM-CMT45 Menu - Flow direction change
Main Screen
Main Screen

AOM-CMT45 – Coriolis Transmitter 13
Input/Output configuration
To configure the analog and digital outputs, navigate to the respective menu items under User Login (Figure 14).
4.2.5.1 Digital output configuration
Select “Pulse Output” 1 [R], 2 [S] or “Digital Output” A [K], B [L] and press “ENTER” [] to get to the “Configuration”
[R/S01, I-L01] menu.
The pulse outputs [R, S] can be assigned to a certain pulse rate from a measured value, e.g. the mass flow rate.
The digital outputs [K, L] can be used to indicate status or error.
“Pulse Output” 1 [R] and/or 2 [S] must be disabled if the parameters “Digital Output”
A [K] and/or B [L] are assigned to universal digital/pulse outputs
Examples:
a) Configuration of pulse output [R, S] for mass:
Select value 1 for parameter ID [R/S01]
Acc. to table 6, the parameter [R/S02] has to be selected. This parameter specifies the mass
equivalent to one pulse. E.g. when set to 0.001kg, a mass transfer of 1kg will cause 1000 pulses
b) Configuration of a frequency output [R, S] for mass flow rate:
Select value 13 for parameter [R/S01]
Acc. to table 6 the parameters [R/S04 & 07] have to be selected. The parameter [R/S04] specifies the
mass flow rate equivalent to the frequency set under parameter [R/S07]. E.g. when [R/S04] is set to
1kg/min and [R/S07] is set to 1000Hz a mass flow rate of 5kg/min will cause a frequency of 5000Hz
Figure 14: AOM-CMT45 Menus - Output configuration
0
Main Screen

14 AOM-CMT45 – Coriolis Transmitter
c) Configuration of a digital output [I-L] for mass flow alarm:
Select value 1 for parameter [I-L01]
Acc. to table 6 the parameters [I-L02, 03 & 04] apply. Select the needed alarm type [I-L02] and enter
the low [I-L03] and high [I-L04] alarm values. The unit of the alarm is determined by the digital
output configuration [I-L01]. For mass flow alarm the unit is fixed to kg/min
Table 6: Important pulse and digital output parameters
ID
Abbreviation
Full Name / Description
R/S01] VersDigOutCh0/1Config
Versatile Digital Output Configuration:
Used to assign different functions to the pulse output.
In simple pulse mode, Pulse1 and Pulse2 operate independently. In phase shift mode,
Pulse1 and Pulse2 work together to produce the desired pulse output relationship. In
phase shift mode, both outputs (Pulse1 & Pulse2) should be set to the same mode.
0: Pulse output is off.
1: Mass Flow – Simple Pulse, Forward Flow. →set [R/S02]
2: Volume Flow – Simple Pulse, Forward Flow. →set [R/S03]
3: Mass Flow – Pulse1 & Pulse2 90 Degrees phase shift. →set [R/S02]
4: Volume Flow – Pulse1 & Pulse2 90 Degrees phase shift. →set [R/S03]
5: Mass Flow – Simple Pulse, Reverse Flow. →set [R/S02]
6: Volume Flow – Simple Pulse, Reverse Flow. →set [R/S03]
7: Mass Flow Rate Fast Frequency Output. →set [R/S04 & 07]
8: Volumetric Flow Rate Fast Frequency Output. →set [R/S05 & 07]
9: Density Fast Frequency Output. →set [R/S06 & 07]
10: Mass Flow Rate Slow Frequency Output. →set [R/S04 & 07]
11: Volumetric Flow Rate Slow Frequency Output. →set [R/S05 & 07]
12: Density Slow Frequency Output. →set [R/S06 & 07]
13: Mass Flow Rate Compatibility Mode Frequency Output.
→set [R/S04 & 07]
14: Volume Flow Rate Compatibility Mode Frequency Output.
→set [R/S05 & 07]
Fast
response
time
Slow
response
time (1s)
Freq. mode
of
previous
[I-L01] DigOutCh0/1/A/BConfig
Digital Output Channel 0 Configuration:
Alarm Channel configuration:
0: Error indication (default)
1: Mass flow alarm →set [I-L02, 03 & 04]
2: Volumetric flow alarm →set [I-L02, 03 & 04]
3: Density alarm →set [I-L02, 03 & 04]
4: Tube temperature alarm →set [I-L02, 03 & 04]
5: Torsion bar temperature alarm →set [I-L02, 03 & 04]
6: Pressure Alarm →set [I-L02, 03 & 04]
7: Forward Mass Totalizer TotalMassFwd for Batch Mode →set [I-L02, 03 & 04]
8: Forward Volume Totalizer TotalVolFwd for Batch Mode →set [I-L02, 03 & 04]
9: Fatal errors or Zeroing force output low, else high.
10: Fatal errors or Zeroing force output high, else low.
For values 1 to 8, the ERR output is pulled high when the alarm condition specified in
DigOutCh0/1/A/BAlmType, DigOutCh0/1/A/B AlmLow, and DigOutCh0/1/A/B
AlmHigh becomes true.
[I-L02] DigOutCh0/1/A/BAlmType
Digital Output Alarm Type:
Alarm Channel: Digital Alarm Type:
0: Setpoint alarm (hysteresis, default) – Alarm is indicated when the output is
higher than DigOutCh0AlmHigh and cleared when it returns below
DigOutCh0AlmLow.
1: Inband alarm – Alarm is indicated when the output is in the range from
DigOutCh0AlmLow to DigOutCh0AlmHigh.
2: Outband alarm – Alarm is indicated when the output is outside the range
DigOutCh0AlmLow and DigOutCh0AlmHigh.
An indicated alarm on channel 0 pulls the digital output 4 labeled “ERR” low.

AOM-CMT45 – Coriolis Transmitter 15
ID
Abbreviation
Full Name / Description
[I-L03] DigOutCh0/1/A/BAlmLow
Digital Output Alarm Low:
Alarm low value, see DigOutCh0/1/A/B AlmType. Must be a floating point value of 0.0
or higher. There is no unit conversion for this register. The unit depends on the
DigOutCh0/1/A/B Config setting:
1: kg/min
2: m3/min
3: kg/m3
4: Degrees Celsius
5: Degrees Celsius
6: Pascal
7: kg
8: m3
The same units are used for all digital status outputs 0, 1, A, and B depending on
DigOutCh0/1/A/BConfig respectively.
[I-L04] DigOutCh0/1/A/BAlmHigh
Digital Output Channel 0 Alarm High:
Alarm high value, see DigOutCh0/1/A/BAlmType. Must be a floating point value of
0.0 or higher. See DigOutCh0/1/A/BAlmLow for the unit specification.
4.2.5.2 Digital input configuration
To configure the digital inputs, navigate to the menu item “HMI”
under User Login (Figure 15).
Select “HMI” [H] and navigate to the “DI1 Property” (digital input 1)
[H02] or to the “DI2 Property” (digital input 2) [H03] menu.
Figure 15: AOM-CMT45 Menu – Digital output Configuration

16 AOM-CMT45 – Coriolis Transmitter
Table 7: Digital input setting options
ID
Abbreviation
Full Name / Description
[H02]
[H03]
DI1Property
DI2Property
Property of Digital Input 1/2:
Functionality of Digital Input 1/2:
0: DI1/2 is disabled. All inputs are ignored (default).
1: DI1/2 causes the start of a Zeroing Process. Logic is positive – a transition to a high logic level starts the Zeroing.
2: DI1/2 causes the start of a Zeroing Process. Logic is negative – a transition to a low logic level starts the Zeroing.
3:
DI1/2 causes reset of the Totalizers and the start of Batch Processing if configured, Batch Mode. Logic is
positive – a transition to a high logic level starts the Batch.
4: DI1/2 causes reset of the Totalizers and the start of Batch Processing if configured
, Batch Mode. Logic is
negative – a transition to a low logic level starts the Batch.
5:
A transition from low to high at DI1/2 stops the totalizers when they are in the running state. A transition from
high to low at DI1/2 restarts the totalizers when they are in the stopped state.
6:
A transition from high to low at DI1/2 stops the totalizers when they are in the running state. A transition from
low to high at DI1/2 restarts the totalizers when they are in the stopped state.
Internal system time
The AOM-CMT45 has a build in real time clock (RTC) which is useful for data logging or zero history.
For further information please refer to the AOM-CMT45 Desktop Reference manual.
The AOM-CMT45 does not feature a backup battery. The date and time must be updated after every
system start or reset.

AOM-CMT45 – Coriolis Transmitter 17
5 Remote Operation
AOM-CMT45 transmitters have a USB interface for fast setup or trouble shooting (* only Aquametro Oil & Marine
Service) and an RS485 interface for digital communication, remote control and data exchange.
Optionally, on 8-pin socket, Modbus TCP, EtherNet/IP, ProfiNet, Profibus DP and EtherCAT are available.
RS485
The RS485 port uses Modbus protocol for permanent connection to a supervisory control system.
For using Modbus via the RS485 serial port, refer to the AOM-CMT45 Operation & Configuration Manual for a
detailed description of the interface and register set.
The AOM-CMT45 has an internal 120Ω termination resistor for the RS485. This resistor can be disconnected via a
switch. Ex works the resistor is connected (switch position “ON”).
In a point-to-point connection of the RS485 the termination resistor is required for cable length of more than
about 5m.
In a chain connection the resistor must be “ON” at the last device in the chain and “OFF” at all devices in
between.
For accessing the RS485 switch refer to chapter 4.1.2.
485B
485A
Figure 16: RS485 interface wiring
6
4

18 AOM-CMT45 – Coriolis Transmitter
6 Service and Maintenance
6.1 Maintenance and Calibration
AOM-CMT45 and the associated AOM-CM flow sensor do not require any regular maintenance.
In harsh environments or if highest accuracy is required, we recommend a zero-point calibration every 2 years.
For the calibration procedure refer to the AOM-CMT45 Operation & Configuration Manual and/or contact
Aquametro Oil & Marine Service.
For best performance the zero-point calibration should be performed from time to time or when the meter shall
be used under drastically changed operating conditions (temperature, density, pressure...).
6.2 Supervision and Troubleshooting
AOM-CMT45 with display:
Each status window shows a code e.g., ‘0x00000000’. By pressing the ENTER button, the cursor scrolls through
this code from right to left. The respective error or warning bit is explained at the bottom of the display.
The transmitter offers a number of different indications and diagnostics about the status of the Coriolis
measurement system. The LEDs on the front face of the transmitter are intended to give a quick visual indication
of the current state of the device.
A complete failure of the firmware due to a program flash failure will be indicated by the green LED being off.
The hardware circuitry for the digital outputs 4 or A which are able to signal error conditions makes sure that
these outputs are kept low to indicate an error condition when the firmware is not running due or the processor
is kept in a reset condition.When an additional external pulldown resistor is attached to the output a low signal
level also can be achieved in the case of a power fail or a shutdown of the digital outputs due to an overload
condition.
Figure 17: Error / warning status
Main Screen

AOM-CMT45 – Coriolis Transmitter 19
LED Status Indicator Description
There are three LED’s on the front face of the AOM-CMT45 transmitter. The following table gives an overview
about the possible states of these LEDs and their meanings.
LED
State
Meaning
Green
Off
Transmitter is not ready. The device is either initializing after a system reset, has no power, or is
defective.
On
Transmitter operative. MODBUS communications are possible.
Blinking
A fast blinking green LED indicates that the bootloader of the AOM-CMT45 transmitter is active,
usually seen during download/upgrade of instrument firmware.
Red
Off
No errors are present and the instrument is operating as intended.
On There is at least one error being reported by the instrument. Details of the exact error(s) can be
obtained by reading the error status registers SoftError and ErrorStatus via MODBUS.
Blinking
When the orange and the red LEDs blink together, the Zeroing Process is in progress.
Orange
On
Hardware Lock Switch (Custody Transfer Lock) active.
Off
Hardware Lock Switch (Custody Transfer Lock) inactive.
Blinking When the orange and the red LEDs blink together the Zeroing Process is in progress.
Red Error LED is ON
There are many conditions that can cause the red error LED to be lit. All of these conditions are found in either
the ErrorStatus (0x401C) register or the SoftError (0x401E) register.
If you have read the registers with an error assignment, please with detailed register values of ErrorStatus
(0x401C or 04-401E) contact Aquametro Oil & Marine for technical support.
The Green LED is Off
The green LED will usually be lit within two seconds after power up. It will be extinguished for a similar time after
system reset.
When the green LED stays off for longer than a few seconds, the most likely problem is with the power supply.
Check the power supply connections acc. 12-pin M12 socket/plug (PIN 1, 3) for polarity, tightness and proper
contact. Measure the applied voltage across these PIN – the transmitters need a continuous regulated power
supply of 24 VDC at 5 Watts or more.
If the power supply is correct and the green LED still remains off, a defect with the transmitter can be assumed
and it should be sent to the factory for repair.
More detailed and specific information can be obtained from the MODBUS status registers. The status register
can be read out via Modbus RTU acc. PIN configuration 12-pin M12 socket/plug (PIN 4, 6).
MODBUS Status Register Description
The transmitter has four MODBUS status registers that provide detailed information about the measurement
status of the device. Bits in these registers are set true whenever a condition occurs that is outside of the normal
operating envelope of the flow meter and/or user configured settings.
Address
Name
Usage
0x401A
ErrorStatus
This register contains information of persistent errors. Once a bit is set in this register, it
remains set until the next system reset or power cycle. Error conditions that cause bits to be
set in this register may be the failure of an internal self-test or a bad configuration error.
Configuration errors are remedied by correcting the setup. See listing of ErrorStatus register
bit definitions.
0x401C
SoftError
The SoftError register contains information related to transient error causes and will reset
automatically when the error is no longer present. Typical examples include exceeding
factory-set hard limits or unstable sensor operation. See listing of SoftError register bit
definitions.

20 AOM-CMT45 – Coriolis Transmitter
Failure Causes and Consequences
There are several causes of failures within and at the interfaces of the transmitter which are considered fatal in the
sense that the measurement results are considered compromised.
Failure Class
Causes and Consequences
1.
Configuration Errors
Implausible configuration of density, Standard Density, pressure or optionally 4-20 mA interfaces
most likely of the type “upper range lower than lower range”.
At least one of the bits 1, 2 or 3 to 13 in the ErrorStatus (0x401A) register are set. Also bit 24 in
SoftError (0x401C) could be set.
In this case the transmitter tries to operate as normal as possible and return plausible
measurement data. When the density configuration is affected no volume flow is indicated.
2. Loss of
NVM/EEPROM Data
detected at system
start-up
A loss of NVM/EEPROM data should never happen because all this data is kept in at least two
redundant data sets. In spite of this the firmware is able to handle this unlikely event as follows:
Loss of the Totalizer Data: Bit 6 in the ErrorStatus (0x401A) register is set.
The Totalizers are reset to 0 and the transmitter tries to operate as normal as possible and return
plausible measurement data.
Loss of the Zeroing Data: Bit 4 in the ErrorStatus (0x401A) register is set.
The Zero Point is reset to 0 and the transmitter tries to operate as normal as possible and return
plausible measurement data. A higher than normal measurement error has to be expected.
Loss of the Setup Data: Bits 0, 7 or 8 in the ErrorStatus (0x401A) register are set.
All setup date including the calibration information is reset to default values. The transmitter tries
to operate as normal as possible, but the results must not be trusted.
3. Sensor failure
The sensor pickup coils do not deliver a plausible signal most likely due to a wire break or a loose
connection at the terminals.
Bit 6 in the ErrorStatus (0x401A) or bits 12 to 14 or bit 22 in the SoftError (0x401C) register are set.
The transmitter will cease to report mass and volume flows and freezes the totalizers as long as
this condition lasts. Depending on bit 0 in the PhsControl (0x6310) register the failure bit 6 in
ErrorStatus (0x401A) is kept set when this conditions lasts for more than 100 seconds even when
the sensor starts to work properly again. This signals that the totalizers cannot be trusted due to a
temporary sensor failure. As a consequence the sensor must start to oscillate properly within 100s
after system start-up.
4. Temperature Data
Failure
The temperature sensors do not deliver a plausible signal most likely due to a wire break or
a loose connection at the terminals.
Bit 2 in the ErrorStatus (0x401A) register or bits 3 or 4 in the SoftError (0x401C) register are
set.
The transmitter tries to operate as normal as possible and return plausible measurement
data. A higher than normal measurement error has to be expected.
5.
Failure of Pressure
data when
configured for the
optional 4-20mA
input
Break of wires, loose terminals at the 4-20mA input, or fire state signalled by the pressure
sensor causes to bit 11 in SoftError (0x401C) to be set.
6.
Measurement
Range
Exceedance
Exceedance of hard limits of the mass flow, volume flow, and density measurements which
will cause one of bits 7, 8, 9, 15, or 16 in SoftError (0x401C) to be set.
The transmitter tries to operate as normal as possible and return plausible measurement data.
0x401E
Warnings
Warnings are conditions which do not result in incorrect measurements. A typical warning is
exceeding a user-defined warning level. Warning status bits reset automatically when the
condition that created the warning is no longer present. See listing of Warning register bit
definitions.
0x4020
InfoStatus
The InfoStatus register contains information about the system state and is mainly used for
service purposes. The InfoStatus register also contains flow direction indication. See listing of
InfoStatus register bit definitions.