Lindab UltraLink FTMU Manual

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Technical information
LindabUltraLink®Monitor
FTMU

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Introduction
UltraLink®FTMU is a highly accurate flow monitor without any obstacles in the
airstream that creates pressure drop. It measures the flow with an angled ultrasonic
beam which can be calculated and compensated to a very high accuracy over the
whole flow range. The method is very stable over time due to that it is not sensitive
to dirt and the design minimizes the dust accumulation on the flow sensors.
An increased focus on energy saving has led to ventilation systems requiring low
minimum flows. The low flows are a problem since they are very difficult to mea-
sure, which makes it difficult to control the ventilation system.
The new technology of UltraLink®makes it possible to measure lower air flows
compared to today’s products while maintaining measurement accuracy. This
offers great advantages for the user in terms of comfort and savings in energy
consumption, which is of great interest.
Content
Introduction .................................................................................................... 2
Overview ........................................................................................................ 3
Description .....................................................................................................3
Planning..........................................................................................................4
Mounting ........................................................................................................6
Connections ................................................................................................... 6
Power supply.................................................................................................. 8
Display............................................................................................................ 9
Settings ..........................................................................................................9
ID-numbers .................................................................................................. 12
Troubleshooting ........................................................................................... 12
Maintenance................................................................................................. 12
PIN code....................................................................................................... 12
Technical data .............................................................................................. 13
Airflows......................................................................................................... 13
Appendix A – Modbus register .................................................................... 14

3
IP42
Status Airflow
m³/h l/s m/s °C
Lindab UltraLink
Monitor FTMU
We reserve the right to make changes without prior notice
Description
Application
The Monitor is suitable for measuring air flow and tempe-
rature. Communication is established via analog or digital
signal using Modbus.
Design
The Monitor consists of a sensor body with Lindab Safe
gaskets.
Two flow sensors are mounted on the sensor body and
connected to a display unit. The display unit is mounted
ontop of a shelf on the sensor body. Since the display
and shelf is mounted on the sensor body using a sheet
metal strap, the display unit can be rotated relative to the
sensorbody.
Positioning the sensor body correctly after a disturbance
is crucial for the measurement accuracy, see page 4 for
directions on how to mount the Monitor for optimal per-
formance.
Note! The flow sensors are placed at a fixed distance
to each other and they shall never be removed and
not used as handles when turning the sensor body.
Overview
Airflow
IP42
Patented
Status
m³/h
l/s
m/s
°C
Mode
Monitor FTMU
Air flow
direction
Display unit
QR code
Status light
Bluetooth®
logotype
Display parameters
Air flow direction
Mode button
CE-mark
IP classification
Display unit
Sensor body
Flow sensor
TCP/IP
RTU

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Planning
The longer distance to disturbance, i.e. the longer straight duct before the Monitor, the higher the measurement accuracy
will be. However this is not the only factor which affects the accuracy of the measurement. The rotation of the Monitor and
hence the positioning of the first flow sensor has an impact on the uncertainty of the measurement. It is not recommen-
ded to mount the Monitor so that the first flow sensor (*) is placed on an outer radius of a fitting.
For example: in the case of the bend in the table below, by rotating the Monitor to position the first flow sensor according
to the first picture (with the first flow sensor on the inner radius of the bend), the Monitor can be placed at the distance
of two duct diameters from the disturbance to achieve 5 % uncertainty. Positioning the Monitor according to the second
picture (with the first sensor on the outer radius of the bend), the Monitor must be mounted five duct diameters from the
disturbance to achieve the same level of uncertainty.
Never use an UltraLink®on the outlet side of a duct fan. Place it on the inlet side or in worst case use a flow conditioner if
it must be placed on the outlet side. Minimum straight distance after Monitor is 1×Ød.
Disturbance * Placement of first flow sensor
Measurement uncertainty
± % or X l/s depending wich is
the greatest, where X equals
the diameter in dm, see table
on page 13.
a
2-4·Ød >4-5·Ød >5·Ød
Bend
a
Ød *
Inner radius 5 5 5
Bend
a
Ød
*
Outer radius
(Not recommended) 20 10 5
Bend
a
Ød
*
a
Ød *
Side 10 5 5

5
We reserve the right to make changes without prior notice
Disturbance * Placement of first flow sensor
Measurement uncertainty
± % or X l/s depending wich is
the greatest, where X equals
the diameter in dm, see table
on page 13.
a
2-4·Ød >4-5·Ød >5·Ød
Reducer
a
Ød
*
Duct diameter
decrease 5 5 5
Reducer
a
Ød
*
Duct diameter increase 10 5 5
T-piece
a
Ød
*
Inner radius 10 5 5
T-piece
a
Ød
*
Outer radius
(Not recommended) 20 10 5
T-piece
a
Ød
*
Side 10 5 5
a
Ød
*

6
24V +B
-A SH
GND
GND
GND
AO1
AO2
AIN MO1
MO2
1234 5 678910 11 12
SCL SDA GND 3V3
1615
14
13
We reserve the right to make changes without prior notice We reserve the right to make changes without prior notice
Connections
Connect the Monitor to a remote terminal unit using RS485 or analog terminals. Connections are made in the terminal
board which can be accessed when the lid of the display unit is removed.
1. 24V, power supply (AC G, DC +) *
2. GND, power supply (AC G0, DC -) *
3. +B, connection for Modbus via RS485
4. -A, connection for Modbus via RS485
5. SH, shield
6. GND, ground (system neutral)
7. AO1, analog output
8. AO2, analog output
9. AIN, (not used in this version)
10. MO1, (not used in this version)
11. MO2, (not used in this version)
12. GND, ground (system neutral)
13. SCL, not used
14. SDA, not used
15. GND, ground (system neutral)
16. 3V3, not used
Mounting
Mount the Monitor into the air duct system according to
the mounting instructions for Lindab Safe. Do not use
the flow sensors as handles when you mount the
Monitor since this may cause damage and changes
in their positions might effect the measurement
accuracy.
Make sure the airflow arrow is pointing in the direc-
tion of the airflow.
Note the ID-number of the Monitor. The ID can be found
on the label of the box it was delivered in or on the label
on the Monitor itself and are the three last numbers of the
serial no.
Position the Monitors sensor body according to the chap-
ter ”Planning”, loosen the screw on the steel strip holding
the display unit in place. Rotate the display unit so that
the display is visible from some direction. For future con-
nections it is important that the screws on the lid of the
display can be removed. Tighten the screw on the steel
strip so that the display unit is fixed to the sensor body.
*) When using AC terminal 1 (G) should be system potential and terminal 2 (G0) should be system neutral.
Recommendations for wiring:
Function Cable type
24 V Supply 2-wire, thickness depending on length and load, max. 1,5 mm²
RS485 2-wire shielded twisted pair, min. 0,1 mm² (LIYCY cable)
Supply the Monitor with power from a transformer.
To be able to connect cords to the terminal board the rubber cable grommet on the backside of the display unit must be
punctured, preferably using an awl or something else pointy to ensure tightness to the environment. When the cords have
been connected they must be strain relieved. The cords can be attached to the shelf by using cable ties that are attached
around cut outs in the shelf.
You must under no circumstances make any holes or connect anything with screws to the sensor body since this will
have an impact on measurement accuracy!

7
BA
+B -A +B -A +B -A
+B
-A
SH SH SH SH
GND
We reserve the right to make changes without prior notice
Digital connection
Connect A on the RTU to -A on the display unit and B to +B. When connecting more than one Controller in series it is
important to keep connecting -A to -A and +B to +B since crossing them will stop Modbus from working. The shield in
the RS485 cable should be connected to ground at the transformer and then continuously connect to ”SH” on all the
UltraLinks that are powered from that transformer. If more than one transformer is used on the bus, the shield is broken
at each transformer so ”SH” on every product only has connection to ground at the transformer from which it’s power is
supplied. It is recommended to use RS485 cables with twisted pairs and shield, do not supply power in the same cable
unless the cable is produced for that purpose.
Analog connection
When connecting the Monitor using analog signals, it is important to connect the analog out signals on the Controller
(AO1, AO2) to the analog in terminals on the RTU and the analog in signal (AIN) is connected to the analog out terminal on
the RTU. Also make sure to connect the cables to the same analog ground.
Bluetooth®connection
If the product is equipped with Bluetooth (the Bluetooth logotype is printed on the displayunit), wireless communication
with the UltraLink can be established. Using a smartphone or tablet with the Lindab UltraLink App, nearby UltraLinks
can be identified. It is then possible to connect to one unit and view information regarding that UltraLink, such as active
measurements and settings.
Mobile app
The app “UltraLink” is available on both Android and iOS, it’s free to download from
Google Play or App store. Like the PC configuration tool, all settings can be changed
via the app. This means all settings can be individually chosen for the specific building,
it is therefore necessary to protect the unit with the PIN code in the UltraLink menu.
For a discription on how this is done, see page 9.
Repeater
If the bus is longer than 300 meters or if there are more than 30 devices, the system
might need an RS485 repeater (FDS-R, see picture to the right) to be able to commu-
nicate in an efficient way.
Biasing
The master on the bus must have biasing on -A and +B. This is more or less standard on BMS-controllers, but if commu-
nication should be established with a conventional computer using a RS485-USB converter, then it is important to make
sure that the converter has a bias circuit. If communication fails and you are uncertain about existance of biasing, you can
add biasing resistors in the screw terminal on one of the UltraLinks to see if this is the cause of the communication failure.
Use 500 - 1000 Ω resistors and connect one
resistor from -A to GND and one from +B to the
3V3 terminal. It is also recommendedto add a 120
Ω termination resistor between -A and +B on the
last UltraLink on the bus to avoid signal reflec-
tions.

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Power supply
Transformer sizing
The needed size of 24 V AC transformer(s) can be defined
by adding up the dimensioning power consumption [VA]
of all the components. The transformer power must
exceed this. Use only safety isolating transformers. Cal-
culation of the current demand I:
I = (P1+P2+…+Pn) / U [A]
where:
Pnis the dimensioned power consumption for each com-
ponent [VA] U is the voltage (24) [V].
If the current demand I exceeds 6 A ( which corresponds
to approximately 150 VA for a 24 V AC transformer ), it is
necessary to use more transformers to prevent overhea-
ting.
Supply cable sizing
The wire size of the supply cable can be determined by
calculating the resistance per meter R. The calculation
presupposes that a voltage drop of e.g. 2 V is accepted in
the supply cable:
R(per m) = Udrop / (I * L) [Ω/m]
where:
Udrop is the accepted voltage drop (2 V) in the cable [V] I is
the current [A]
L is the longest distance of supply cables from transfor-
mer to a component [m]
Wire cross section area as a function of resistance per m for copper wire
0,7
0,6
0,8
0,9
1
1,1
1,2
1,3
1,4
1,5
Wire cross section Area [ mm2 ]
0
0,1
0,2
0,3
0,4
0,5
0,20
0,15
0,100,050
Copper Resistance [ Ω/m ]
Example:
Udrop = 2 V, I = 4 A, L = 20 m
R (per m) = 2V / (4A × 20 m) = 0,025 Ω/m
In the diagram a Wire cross section Area of 0,7 mm² can
be read.
Power consumption
The power consumption for dimensioning supply cables
for an UltraLink®Monitor is 0,5 VA.
It is not recommended to use a transformer with a
higher capacity than 150 VA!

9
Airflow
IP42
Patented
Status
m³/h
l/s
m/s
°C
Mode
Monitor FTMU
We reserve the right to make changes without prior notice
Display
The display can show useful information both with the
diode flashing in green (status light) and with parameters
in the LCD. If the product is equipped with Bluetooth, then
the diode will also flash in blue every three seconds. If a
device has been connected to the UltraLink via Bluetooth,
then the diode will flash in blue every other second. By
short pressing the mode button you can change the dis-
played parameter. If the button is pressed for more than 5
seconds (long press) then the configuration menu will be
visible. The arrow at the bottom of the display indicates
the current parameter type and unit.
The following parameters can be shown:
• Air flow (m³/h)
• Air flow (l/s)
• Air velocity (m/s)
• Temperature (°C)
• Monitor’s ID number
The standard setting for the display shows the air flow in
m³/h.
For a detailed description on configurating the UltraLink
using the mode button on the display, see page 11.
Status light
The status light indicates:
Mode Function
No light Monitor is turned off
Flashing light A problem has occured
Constant light Monitor is turned on and functioning as normal

10 We reserve the right to make changes without prior notice We reserve the right to make changes without prior notice
Settings
All available settings are presented in the appendix. These can be changed via a Bluetooth device and an app, which can
downloaded from Google Play or App Store. The settings can also be changed via the RS485 bus and can be done from
any device and configuration that can communicate using Modbus, but preferably the UltraLink®Configuration tool (See
separate documentation). Instructions for the most common settings are described below. For more register details see
appendix.
Digital communication settings
Registers 4x001-4x009 are used to configure communication settings. When initializing contact for the first time the
default settings will be active;
Modbus id: Last three digits in the serial number (also visible in the display if the product has power)
Baud rate: 19200
Parity: Odd
Stop bits: 1
After updating any of the communication parameters the product needs to be power cycled for the changes to take eff
ect. If communication fails with the default parameters selected in the UltraLink®configuration tool, then the communi-
cation settings on the Monitor might have been changed previously. Verify the settings in the display (See page 11 for
instructions)
Analog out settings
Analog out is always active but you need to specify what kind of data you want to read on the two ports;
1. Configure registers 4 × 401 and 4 × 431 for the variables you want to read on the analog out terminals (0 = Flow, 1 = Tempe-
rature).
2. Configure registers 4
× 400 and 4 × 430 for analog out level configuration ( (0) 0-10V, (1) 10-0V, (2) 2-10V, (3) 10-2V)
3. Configure registers 4
× 401–406 and 4 × 431–436 with relevant data for max and min levels for the voltage range selected in
step 2. You only need to configure the max and min values corresponding to the variable selected in step 1.
Size Ø
[mm]
4x400
Level Conf.
4x401
Unit Conf.
4x402
Temp Min [°C]
4x403
Temp Max[°C]
4x404
Flow Min [l/s]
4x406
Flow Max [l/s]
100
2 (2-10V ) 0 (Flow)
050 055
125 050 086
160 050 0141
200 050 0220
250 050 0344
315 050 0546
400 050 0880
500 050 01374
630 050 02182
Default values for the relevant registers related to “Analog Out 2” are according to the table below (Default values for flow
max corresponds to 7 m/s).
Size Ø
[mm]
4x430
Level Conf.
4x431
Unit Conf.
4x432
Temp Min [°C]
4x433
Temp max[°C]
4x434
Flow Min [l/s]
4x436
Flow Max [l/s]
100
2 (2-10V ) 1 (Tempera-
ture)
050 055
125 050 086
160 050 0141
200 050 0220
250 050 0344
315 050 0546
400 050 0880
500 050 01374
630 050 02182