Lindab UltraLink FTMU Manuel

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Technical information

LindabUltraLink®Monitor

FTMU

2We reserve the right to make changes without prior notice We reserve the right to make changes without prior notice

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

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

4We reserve the right to make changes without prior notice We reserve the right to make changes without prior notice

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.

2-4·Ød >4-5·Ød >5·Ød

Bend

Ød *

Inner radius 5 5 5

Bend

Ød

Outer radius

(Not recommended) 20 10 5

Bend

Ød

Ød *

Side 10 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.

2-4·Ød >4-5·Ød >5·Ød

Reducer

Ød

Duct diameter

decrease 5 5 5

Reducer

Ød

Duct diameter increase 10 5 5

T-piece

Ød

Inner radius 10 5 5

T-piece

Ød

Outer radius

(Not recommended) 20 10 5

T-piece

Ød

Side 10 5 5

Ød

24V

-A

GND

AO1

AO2

AIN

MO1

MO2

1234 5 678910 11 12

SCL

SDA

GND

3V3

1615

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!

+B -A +B -A +B -A

-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.

8We reserve the right to make changes without prior notice We reserve the right to make changes without prior notice

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

1,2

1,3

1,4

1,5

Wire cross section Area [ mm2 ]

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!

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

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