FISCHER ECO-LINE FT80 User manual

Modbus
Operating manual
FT80
Humidity and temperature measuring device
ECO-LINE ®
09015261 • BA_EN_FT80 • Rev. ST4-B • 04/23 *09015261*

| Masthead FISCHER Mess- und Regeltechnik GmbH
2/32 BA_EN_FT80
Masthead
Manufacturer: FISCHER Mess- und Regeltechnik GmbH
Bielefelderstr. 37a
D-32107 Bad Salzuflen
Telephone: [phone]
Telefax: [phone]
eMail: [email protected]
web: www.fischermesstechnik.de
Technical editorial team: Documentation representative: T. Malischewski
Technical editor: R. Kleemann
All rights, also those to the translation, reserved. No part of this document may
be reproduced or processed, duplicated or distributed using electronic systems
or any other form (print, photocopy, microfilm or another process) without the
written consent of the company FISCHER Mess- und Regeltechnik GmbH, Bad
Salzuflen.
Reproduction for internal use is expressly allowed.
Brand names and procedures are used for information purposes only and do
not take the respective patent situation into account. Great care was taken
when compiling the texts and illustrations; Nevertheless, errors cannot be ruled
out. The company FISCHER Mess- und Regeltechnik GmbH will not accept any
legal responsibility or liability for this.
Subject to technical amendments.
© FISCHER Mess- und Regeltechnik 2022
Version history
Rev. ST4-A 03/22 Version 1 (first edition)
Rev. ST4-B 04/23 Version 2 (change product number key; Mounting the
screw plug)

FISCHER Mess- und Regeltechnik GmbH Table of contents
BA_EN_FT80 3/32
Table of contents
1 Safety instructions.......................................................................................................... 4
1.1 General................................................................................................................................... 4
1.2 Personnel Qualification .......................................................................................................... 4
1.3 Risks due to Non-Observance of Safety Instructions............................................................. 4
1.4 Safety Instructions for the Operating Company and the Operator ......................................... 4
1.5 Unauthorised Modification...................................................................................................... 4
1.6 Inadmissible Modes of Operation........................................................................................... 4
1.7 Safe working practices for maintenance and installation work............................................... 5
1.8 Pictogram explanation............................................................................................................ 5
2 Product and functional description............................................................................... 6
2.1 Delivery scope........................................................................................................................ 6
2.2 Intended use........................................................................................................................... 6
2.3 Function diagram.................................................................................................................... 6
2.4 Design and mode of operation ............................................................................................... 6
2.5 Device versions ...................................................................................................................... 7
3 Installation ....................................................................................................................... 9
3.1 General................................................................................................................................... 9
3.2 Mechanical installation and mounting .................................................................................... 10
3.3 Electrical connection .............................................................................................................. 12
4 Start-up ............................................................................................................................ 13
4.1 General................................................................................................................................... 13
4.2 Display.................................................................................................................................... 13
4.3 Config select........................................................................................................................... 13
5 Servicing .......................................................................................................................... 19
5.1 Maintenance........................................................................................................................... 19
5.2 Transport ................................................................................................................................ 19
5.3 Service ................................................................................................................................... 19
5.4 Disposal.................................................................................................................................. 19
6 Technical data ................................................................................................................. 20
6.1 General................................................................................................................................... 20
6.2 Input variables ........................................................................................................................ 20
6.3 Output sizes ........................................................................................................................... 20
6.4 Measuring accuracy ............................................................................................................... 21
6.5 Digital interfaces..................................................................................................................... 22
6.6 Auxiliary energy...................................................................................................................... 22
6.7 Operating conditions .............................................................................................................. 22
6.8 Display.................................................................................................................................... 22
6.9 Construction design................................................................................................................ 23
7 Order codes ..................................................................................................................... 27
7.1 Accessories ............................................................................................................................ 28
8 Annex ............................................................................................................................... 29

1 | Safety instructions FISCHER Mess- und Regeltechnik GmbH
4/32 BA_EN_FT80
1 Safety instructions
1.1 General
This operating manual contains basic instructions for the installation, operation
and maintenance of the device that must be followed without fail. It must be
read by the installer, the operator and the responsible specialist personnel be-
fore installing and commissioning the device.
This operating manual is an integral part of the product and therefore needs to
be kept close to the instrument in a place that is accessible at all times to the re-
sponsible personnel.
The following sections, in particular instructions about the assembly, commis-
sioning and maintenance, contain important information, non-observance of
which could pose a threat to humans, animals, the environment and property.
The instrument described in these operating instructions is designed and manu-
factured in line with the state of the art and good engineering practice.
1.2 Personnel Qualification
The instrument may only be installed and commissioned by specialized person-
nel familiar with the installation, commissioning and operation of this product.
Specialized personnel are persons who can assess the work they have been
assigned and recognize potential dangers by virtue of their specialized training,
their skills and experience and their knowledge of the pertinent standards.
1.3 Risks due to Non-Observance of Safety Instructions
Non-observance of these safety instructions, the intended use of the device or
the limit values given in the technical specifications can be hazardous or cause
harm to persons, the environment or the plant itself.
The supplier of the equipment will not be liable for damage claims if this should
happen.
1.4 Safety Instructions for the Operating Company and the
Operator
The safety instructions governing correct operation of theinstrument must be
observed. The operating company must make them available to the installation,
maintenance, inspection and operating personnel.
Dangers arising from electrical components, energy discharged by the medium,
escaping medium and incorrect installation of the device must be eliminated.
See the information in the applicable national and international regulations.
Please observe the information about certification and approvals in the Tech-
nical Data section.
1.5 Unauthorised Modification
Modifications of or other technical alterations to the instrument by the customer
are not permitted. This also applies to replacement parts. Only the manufacturer
is authorised to make any modifications or changes.
1.6 Inadmissible Modes of Operation
The operational safety of this instrument can only be guaranteed if it is used as
intended. The instrument model must be suitable for the medium used in the
system. The limit values given in the technical data may not be exceeded.
The manufacturer is not liable for damage resulting from improper or incorrect
use.

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1.7 Safe working practices for maintenance and installation work
The safety instructions given in this operating manual, any nationally applicable
regulations on accident prevention and any of the operating company's internal
work, operating and safety guidelines must be observed.
The operating company is responsible for ensuring that all required mainten-
ance, inspection and installation work is carried out by qualified specialized per-
sonnel.
1.8 Pictogram explanation
DANGER
Type and source of danger
This indicates a direct dangerous situation that could lead to death or serious
injury (highest danger level).
1. Avoid danger by observing the valid safety regulations.
WARNING
Type and source of danger
This indicates a potentially dangerous situation that could lead to death or ser-
ious injury (medium danger level).
1. Avoid danger by observing the valid safety regulations.
CAUTION
Type and source of danger
This indicates a potentially dangerous situation that could lead to slight or seri-
ous injury, damage or environmental pollution (low danger level).
1. Avoid danger by observing the valid safety regulations.
NOTICE
Note / advice
This indicates useful information of advice for efficient and smooth operation.

2 | Product and functional description FISCHER Mess- und Regeltechnik GmbH
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2 Product and functional description
2.1 Delivery scope
• Humidity and temperature measuring device FT80
• FF80 humidity and temperature sensor
• Locking screw (included in the device)
• Mounting flange for duct sensor version
• Mounting material not included
• Operating Manual
2.2 Intended use
The FT80 is suitable for the measurement of humidity and temperature in non-
condensing air.
The device may only be used for the purpose stipulated by the manufacturer.
The manufacturer will not be liable for damage arising from incorrect or im-
proper use.
2.3 Function diagram
Display Power pack
24 V AC/DC
RS485
Modbus
µC
DIP switches
Configuration
Sensor 2
Humidity
Sensor 1
Temperature
Analogue output 2
Analogue output 1 °C
% rH
Fig.1: Function diagram
2.4 Design and mode of operation
The temperature and humidity measurement is based on a sensor chip with a
digital I2C bus interface. The analogue measurement data is digitally converted
and linearised. The transmitted data is evaluated by the integrated electronics
and then output via an optional display, analogue outputs or via the optional
Modbus output.

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2.5 Device versions
Version with display Version without display
Fig.2: Device versions
2.5.1 Process connection
NOTICE!The sensor can also be mounted remotely with an M12 cable.
FF90 humidity
and temperature sensor
Humidity and temperature measuring device
Standard
Humidity and temperature measuring device
Duct sensor
FF90 humidity
and temperature sensor
Mounting flange
M12 plug
Fig.3: Process connections

2 | Product and functional description FISCHER Mess- und Regeltechnik GmbH
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2.5.2 Electrical connection
Cable screw connection
M16 x 1.5
Option A:
Cable screw connection
Option B:
M12 plug connection
5-pin
Fig.4: Electric connections
2.5.3 Type plate
D-32107 Bad Salzuflen
Channel 1 (T) Channel 2 (rH)
P#
M#
Made in Germany-20 °C ≤ Tamb ≤ 70 °C
Type
2
34
56
7
1
9
8
P#
M#
Input
Output
Production No.
Customer No.
Key to symbols Input signal
Output signal
Serial number
Customer article number
Fig.5: Type plate
1 Conformity 2 Device type (order code)
3 Measuring range (adjustable) 4 Output signal (adjustable)
5 Auxiliary energy 6 Serial number
7 Customer article number (op-
tional)
8 Special features
(e.g. silicone-free)
9 Circuit diagram

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3 Installation
3.1 General
The device is designed for installation on assembly plates or wall surfaces. For
this purpose, the device has two fastening lugs integrated into the side. The at-
tachment screws are not included in the delivery.
NOTICE!The locking screw is located in a plastic bag inside the device.
Locking screw
Unlocking
Locking lug
Mounting hole 1
Mounting hole 2
Accessory kit
T10 ISO 10664 TX10
Fig.6: Mounting/opening the casing
Alternatively, the device can be equipped with mounting feet for 35 mm top-hat
rail mounting.
In the duct sensor version, the device is equipped with a mounting flange for
ventilation ducts.
The enclosure protection type IP 65 is only guaranteed, if a suitable power sup-
ply cable is used (see accessories).
(a) Opening the casing
To open the casing, first remove the screw plug (if present). Then the casing
can then be unlocked. To do this, use a suitable slotted screwdriver to press the
locking lug at the designated point.
(b) Closing the casing
Close the cover until the latch clicks into place. Protection class IP54 is
achieved with the snap-in connection alone.
NOTICE!The screw plug included must be used to achieve IP65.
Please contact the manufacturer if the screw is missing. It is a special screw for
thermoplastics. Protection class IP65 cannot be achieved with another screw as
a replacement.

3 | Installation FISCHER Mess- und Regeltechnik GmbH
10/32 BA_EN_FT80
(c) Mounting the screw plug
The installation of the locking screw ensures that the release is blocked and the
cover is held in position. It is a self-tapping screw for polycarbonate.
During installation (1), a screw-in torque [ME] of maximum 1.2 Nm is required to
form the thread and overcome the friction. Heat is generated during this pro-
cess.
WARNING!Always mount the screw by hand. Do not use a cordless
screwdriver.
As soon as the screw head is in contact (2), the installation is complete. Further
tightening torque [MA] to apply a pretensioning force is not necessary, as the
function of the screw is already fulfilled in this position.
Please note that if the screw is turned further, the overtorque [MÜ] will quickly be
reached and the thread destroyed (3).
1
2
3
Drehmoment
Drehwinkel
1,2 Nm
MÜ
MEMReib
MForm
MA
1 2 3
Fig.7: Permissible torques
3.2 Mechanical installation and mounting
The device is equipped with an FF80 sensor for humidity and temperature. The
sensor is factory-mounted on the device.
Fastening lug
for 4 mm screws
Filter side Vertical installation
Horizontal installation
0 ... 90°
Fig.8: Permissible installation position

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3.2.1 Installation of the sensor
It is possible to connect the humidity and temperature sensor (FF80) to the
FT80 with an M12 cable and to mount it separately from the device. For this
purpose, the corresponding connection cables and a mounting clip for installa-
tion on flat surfaces and pipes are available as accessories.
A mounting flange is factory-mounted on the duct sensor, which is suitable for
rectangular ventilation ducts. Since the air duct material can be quite different,
no mounting screws are supplied. The sensor can also be mounted remotely in
the case of duct sensors.
M12 connection cable
4 pin max. 5 m
Ventilation duct
(example)
Mounting flange
Remote sensor Duct sensor
Mounting clip
M12 bush
M12 plug
Fig.9: Installation types

3 | Installation FISCHER Mess- und Regeltechnik GmbH
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3.3 Electrical connection
• By authorized and qualified specialized personnel only.
• When the device is connected, national and international electrotechnical
regulations must be observed.
• Disconnect the system from the mains before electrically connecting the
device.
• Do not connect the device when it is live.
NOTICE!In the version with cable screw connection, the M12 connector
shown is omitted.
3-conductor
+
°C / % rH +Ub
-Ub
24 V AC/DC
7
6
Output 1
+Aout 1
4+Aout 2
(~)
(~)
FT80 Auxiliary energy
+Ub
-Ub
+Ub
-Ub
+Aout 2
5 6 743 5
3
+Aout 1
n.c.
+
Output2
ϑ
φ
n.c.
% rH°C
1
3
2
4
BN BU BK WH
Fig.10: Electrical connection, 3-conductor
5
3-conductor with Modbus
+Ub
-Ub
24 V AC/DC
5(~)
(~)
1234
FT80 Auxiliary energy
4
3
2
1
+Ub
-Ub
+Ub
-Ub
BUS-R
BUS-D0 BUS-D1
BUS-R
BUS-D0
BUS-D1
°C / % rH ϑ
φ
1
3
2
4
BN BU BK WH GY
Fig.11: Electrical connection of a 3-conductor with Modbus
Connection to an existing Modbus RTU network
Slave 1 Slave 247
MASTER
TAP
Bus termination
FT80 FT80
Addr. 1 Addr. 128
Auxiliary energy
M12 cable
Fig.12: Modbus RTU network

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4 Start-up
4.1 General
All electrical supply, operating and measuring lines, and the pressure connec-
tions must have been correctly installed before commissioning. All supply lines
are arranged so that there are no mechanical forces acting on the device.
4.2 Display
Optionally, the device can be delivered with a LC display. After switching on the
auxiliary voltage, the following start screen appears for a few seconds.
v1.0
-20°C ... 80 °C
0% rH ... 100 % rH
2
Software version Max. measuring ranges
Dev. type
Fig.13: Start screen
After that, the current measured values appear on the display.
21.3 °C
53.7 % rH
1
2
Fig.14: Meas. data display
4.3 Config select
When configuring the FT80 devices, a distinction is made between devices with
analogue output and devices with Modbus.
4.3.1 Devices with analogue output
Unit temperature1
2
3Temperature measuring range - channel 1
4Humidity unit/function - channel 2
5
6 Channel 2 humidity measuring range
7 Output signal
8 Live Zero
1234567
ON
8
ON OFF
DIP switches
DIP switches
Fig.15: Control elements for configuration

4 | Start-up FISCHER Mess- und Regeltechnik GmbH
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4.3.1.1 Measuring range
4.3.1.1.1 Temperature (channel 1)
14
ON
567 1 1
°C
°F
2 3 8
Fig.16: Unit of temperature
34
ON
567 2
3
1 82 3
2
32
2 3
-20 ... +80 °C
1
1
1
1
0 ... +50 °C
-40 ... +60 °C
-15 ... +35 °C
2
3
3
2
32
2 3
0 ... +200 °F
+40 ... +140 °F
-40 ... +160 °F
0 ... +100 °F
1
1
1
1
Fig.17: Measuring range of temperature
4.3.1.1.2 Humidity (channel 2)
4
ON
6 7 42 3 81 5 5
4 5
4 5
4 5
Relative humidity
Enthalpy
Absolute humidity
Dew point
1
4 5
Dew point
1
[% rH]
[kJ/kg]
[g/m
[°C]
[°F]
3]
Fig.18: Unit of humidity/function
ON
5 72 3 81 6
0 ... +100 % rH
4 5 64
No change
564
0 ... +85 kJ/kg
564
No change
564
0 ... +50
465
0 ... +80
465
g/m3g/m3
0 ... +50 °C
564
-20 ... +80 °C
5641
1
1
1
+40 ... +140 °F
564
0 ... +200 °F
564
Fig.19: Measuring ranges

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4.3.1.2 Output signal
The switch position always affects both analogue outputs.
74
ON
5 6 72 31 8 8
0 ... 10 V
7 8
2 ... 10 V
7 8
0 ... 20 mA
7 8
4 ... 20 mA
Fig.20: Analogue output
4.3.1.3 Description of functions
The DIP switch is used to configure the two measuring channels and the output
signal.
Configure the device by moving switches S1 to S8 to the desired position. The
switch position is sensed continuously. This means that the device can also be
configured when it is switched off.

4 | Start-up FISCHER Mess- und Regeltechnik GmbH
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4.3.2 Device with Modbus
NOTICE!In this section you will learn how to configure a Modbus device.
Further information can be found in the Modbus manual.
Bus configuration
DIP switches
Status LED
Baud rate
Parity
Stop bit
Byte order
Modbus address = OFF
1234567
ON
8
ON OFF
DIP switch
1
2
Interface = ON
Address
1234567
ON
8
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Fig.21: Control elements for configuration
If the button is pressed for several seconds, an information window with the cur-
rently set BUS configuration appears on the display (if available).
Config:
ID:
19200/8-E-1
1
MSB-first
Modbus address interface
Fig.22: Bus configuration

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4.3.2.1 Modbus address
NOTICE!Address 0 is reserved for the broadcast. For this reason, a
decimal 1 is added to each set address.
1234567
ON
8
S1 S2 S3 S4 S5 S6 S7 Address
ON=1 OFF=0
20212223242526 Binary
0000000 1
1000000 2
0100000 3
1111111 128
Decimal 1 2 4 8 16 32 64 Sum +1+ + + + + + 127
Σ
=
0
1
2
127
S8
0
0
0
0
Fig.23: Setting the Modbus address
4.3.2.2 Interface
123
ON
ON=1 OFF=0
4567
S1 S2 S3
202122 Binary
000
100
010
Decimal 1 2 4+ +
Baud rate
7
Σ
=
0
1
2
110 3
001
101
4
5
011 6
111 7
2400
4800
9600
14400
19200
38400
57600
115200
123
ON
456 7
S4 S5
0 0
1 0
0 1
Parity
without
even
uneven
123
ON
65 7
S6
0
1
Stop bit
1 Bit
2 Bits
S8
1
1
1
1
1
1
1
1
S8
1
1
1
S8
1
1
S7
0
1
Byte order
MSB ... LSB
LSB ... MSB
S8
1
1
123
ON
8767
4
8
8
8
8
Fig.24: Configuring the interface

4 | Start-up FISCHER Mess- und Regeltechnik GmbH
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4.3.2.3 Description of functions
DIP switches
The Modbus is configured with the DIP switch.
There are two settings areas. They are divided into interface and address con-
figurations. Switch S8 allows you to switch between the two setting areas.
As soon as the BUS configuration is changed using the DIP switches, an in-
formation window appears on the display (if available) with the currently set
BUS configuration.
For complete configuration, the following procedure is recommended:
• First switch on the device and then set all DIP switches to the OFF position.
Now use S1 to S7 to select the desired MODBUS address.
• Next, set switch S8 to ON. Now you can configure the baud rate, parity,
number of stop bits and byte order.
• Moving each switch results in a configuration change. The configuration is
saved after each change. If the operator changes the switch position while
the device is switched off, this does not change the bus parameters.
Button
If the button is pressed for several seconds, an information window with the cur-
rently set BUS configuration appears on the display (if available).
Status LED
The status LED flashes quickly and evenly when the device is sending data to
the master via Modbus.

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5 Servicing
5.1 Maintenance
The instrument is maintenance-free. We recommend the following regular in-
spection to guarantee reliable operation and a long service life:
• Check the function in combination with downstream components.
• Check the electrical connections.
The exact test cycles need to be adapted to the operating and environmental
conditions. In combination with other devices, the operating instructions for the
other devices also need to be observed.
5.2 Transport
The measuring device must be protected against impacts. It should be transpor-
ted in the original packaging or a suitable transport container.
5.3 Service
All defective or faulty devices should be sent directly to our repair department.
Please coordinate all shipments with our sales department.
WARNING
Process media residues
Process media residues in and ondismantled devices can be a hazard to
people, animals and the environment. Take adequate preventive measures. If
required, the devices must be cleaned thoroughly.
Return the device in the original packaging or a suitable transport container.
5.4 Disposal
Please help to protect the environment by always disposing of the work pieces
and packaging materials in compliance with the valid national waste and recyc-
ling guidelines or reuse them.

6 | Technical data FISCHER Mess- und Regeltechnik GmbH
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6 Technical data
6.1 General
Type designation FT80
Measuring variable Humidity
Temperature
Measurement
principle
Humidity Capacitive
Temperature Band gap
Remote sensor 5 m max. cable length (between
sensor and device)
Installation position Sensor with filter side in the range ver-
tical down to horizontal
Reference conditions (acc. to IEC 61298-1)
Temperature +15 to +25 °C
Relative humidity 45 … 75%
Air pressure 86 to 106 kPa 860 to 1060 mbar
6.2 Input variables
Sensor assembly Temperature measuring range
Basic measuring
range
On device -20 to +70 °C
Offset -40 to +95 °C
Adjustable via DIP
switch
-20 to +80 °C 0 … 200 °F
0 to +50 °C +40 to +140 °F
-40 to +60 °C -40 to +160 °F
-15 to +35 °C 0 … +100 °F
Humidity measuring range
Adjustable via DIP
switch
Relative humidity 0 … +100 % rH
Enthalpy 0 … +85 kJ/kg
Absolute humidity 0 … +50 g/m30 … +80 g/m3
Dew point 0 to +50 °C -20 to +80 °C
+40 to +140 °F 0 … +200 °F
6.3 Output sizes
A DIP switch can be used to switch the analogue outputs between 0 ... 20 mA /
0 … 10 V and 4 … 20 mA / 2 … 10 V (Live Zero).
Temperature analogue output, 3-conductor
Output signal 1 0 to 20 mA
4 to 20 mA
0 … 10 V
2 … 10 V
Signal range 0.0 to 21.5 mA 0.0 to 10.75 V
Load impedance RL≤ 600 Ω ≥ 2 kΩ
Humidity analogue output, 3-conductor
Output signal 2 0 to 20 mA
4 to 20 mA
0 … 10 V
2 … 10 V
Signal range 0.0 to 21.5 mA 0.0 to 10.75 V
Load impedance RL≤ 600 Ω ≥ 2 kΩ