IFM TAD 81 Series User manual

Operating instructions
Temperature transmitter
TADx81
TADx91
80282432 / 00 09 / 2019
UK

2
Contents
1 Preliminary note���������������������������������������������������������������������������������������������������3
1�1 Symbols used ������������������������������������������������������������������������������������������������3
2 Safety instructions �����������������������������������������������������������������������������������������������3
3 Getting started �����������������������������������������������������������������������������������������������������4
4 Functions and features ����������������������������������������������������������������������������������������5
5 Function���������������������������������������������������������������������������������������������������������������5
5�1 IO-Link �����������������������������������������������������������������������������������������������������������6
5�2 Analogue function ������������������������������������������������������������������������������������������6
5�3 Diagnostic function ����������������������������������������������������������������������������������������8
5�3�1 Drift monitoring ������������������������������������������������������������������������������������8
5�3�2 Sensor backup (redundancy switching)������������������������������������������������9
5�3�3 Diagnostic cases ��������������������������������������������������������������������������������10
5�3�4 Diagnostic function in 2-wire operation�����������������������������������������������10
5�3�5 Diagnostic function in 3-wire operation����������������������������������������������� 11
5�3�6 Process data transmission in IO-Link operation ���������������������������������13
6 Installation ���������������������������������������������������������������������������������������������������������14
6�1 Units with G1 / Aseptoflex Vario process connection����������������������������������14
6�1�1 Installation using an adapter with sealing ring (hygiene-compliant) ��14
6�1�2 Installation using a welding adapter with sealing ring (hygiene-
compliant)�����������������������������������������������������������������������������������������������������14
6�1�3 Installation using a process adapter with metal-to-metal seal ������������15
6�1�4 Installation to G 1 flange���������������������������������������������������������������������15
6�2 Units with process connection G ½ sealing cone ����������������������������������������15
6�3 Use in hygienic areas to 3-A������������������������������������������������������������������������15
6�4 Use in hygienic areas to EHEDG ����������������������������������������������������������������16
7 Electrical connection������������������������������������������������������������������������������������������17
8 Parameter setting ����������������������������������������������������������������������������������������������17
8�1 Adjustable parameters���������������������������������������������������������������������������������18
9 Operation�����������������������������������������������������������������������������������������������������������19
10 Technical data��������������������������������������������������������������������������������������������������19
10�1 Setting range for drW / drA������������������������������������������������������������������������19

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1 Preliminary note
Technical data, approvals, accessories and further information at
www�ifm�com�
1.1 Symbols used
►Instructions
> Reaction, result
[…] Designation of keys, buttons or indications
→Cross-reference
Important note
Non-compliance may result in malfunction or interference�
Information
Supplementary note�
2 Safety instructions
• The device described is a subcomponent for integration into a system�
- The manufacturer of the system is responsible for the safety of the system�
- The system manufacturer undertakes to perform a risk assessment and to
create a documentation in accordance with legal and normative requirements
to be provided to the operator and user of the system� This documentation
must contain all necessary information and safety instructions for the operator,
the user and, if applicable, for any service personnel authorised by the
manufacturer of the system�
• Read this document before setting up the product and keep it during the entire
service life�
• The product must be suitable for the corresponding applications and
environmental conditions without any restrictions�
11 Fault correction ������������������������������������������������������������������������������������������������21
12 Factory setting �������������������������������������������������������������������������������������������������22

4
• Only use the product for its intended purpose (→ 4 Functions and features)�
• Only use the product for permissible media (→ 10 Technical data)�
• If the operating instructions or the technical data are not adhered to, personal
injury and/or damage to property may occur�
• The manufacturer assumes no liability or warranty for any consequences
caused by tampering with the product or incorrect use by the operator�
• Installation, electrical connection, set-up, operation and maintenance of the
product must be carried out by qualified personnel authorised by the machine
operator�
• Protect units and cables against damage�
3 Getting started
Detailed description under → 8 Parameter setting�
1� Connect unit to PC to set the parameters via the IO-Link interface�
2� Set the standard unit of measurement�
- [Uni]: °C or °F
3� Set analogue signal�
- [OU2]: I = 4���20 mA or I neg = 20���4 mA
- [ASP] and [AEP]: scaling of the measuring range�
4� Set drift monitoring�
- [drW]: drift threshold from which the unit signals "warning"�
- [drA]: drift threshold from which the unit signals "alarm"�
- [ddr]: delay time of the drift detection�
5� Select diagnostic cases that should be signalled (→ 5.3.3)�
- [drEd]:
ON = only diagnostic cases of category "failure"
ONdr = diagnostic cases of categories "alarm" + "failure"
OFF = diagnostic cases of categories "warning" + "alarm" + "failure"
6� Configure analogue signal for diagnostic case
- [FOU2]: On = 21�5 mA or OFF = 3�5 mA

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UK
7� Configure switching signal for diagnostic case (only 3-wire operation without
IO-Link)
- [dOU1]: Output opens / closes / pulsates;
according to setting Table 3 → 5.3.5�
8� Configure output logic for diagnostic output (only 3-wire operation without IO-
Link)
- [P-n]: pnp or npn
9� Finish parameter setting, install (→ 6), connect (→ 7) and set up unit�
4 Functions and features
The unit detects the medium temperature and provides the measured value via an
analogue or a digital signal�
The unit features an integrated diagnostic function and a drift monitoring� The
diagnostic messages are provided via an analogue signal in 2-wire operation, in
addition via a switching signal or as a digital communication signal via the IO-Link
interface in 3-wire operation�
The switching output can be used for diagnostics�
5 Function
• The unit has an IO-Link interface� This offers the following additional functions:
- Remote parameter setting of the unit�
- Transmission of the set parameter values to other sensors�
- Simultaneous reading of all process values (mean value of both sensor
elements, Pt 1000 sensor element, NTC sensor element) and the binary
switching signal�
- Comprehensive display of error and event messages�
- Display of minimum and maximum temperature values�
• The unit is designed for two or three-wire operation� Depending on the
operating mode the following output signals are provided:

6
Operating
mode
Output signals
2 wires OUT: - Analogue signal for temperature measurement
and diagnostics
3 wires OUT1: - Switching signal for diagnostics
or
- IO-Link signal for temperature measurement and
diagnostics
OUT2: - Analogue signal for temperature measurement
and diagnostics
5.1 IO-Link
This unit has an IO-Link communication interface which enables direct access to
process and diagnostic data� In addition it is possible to set the parameters of the
unit while it is in operation� Operation of the unit via an IO-Link interface requires
an IO-Link master�
With a PC, suitable IO-Link software and an IO-Link adapter cable communication
is possible when the system is not in operation�
The IODDs necessary for the configuration of the unit, detailed information about
process data structure, diagnostic information, parameter addresses and the
necessary information about the required IO-Link hardware and software can be
found at www�ifm�com�
5.2 Analogue function
The unit converts the measured temperature value into a temperature-proportional
analogue signal�
In addition the analogue output is used for diagnostics (→ 5.3 Diagnostic
function): The transfer of the measured temperature value is interrupted for
diagnostic messages depending on the operating mode and the setting of drEd
and an analogue signal according to NE43 of 3�5 mA (FOU2 = OFF) or 21�5 mA
(FOU2 = On) is provided�
Depending on the parameter setting (→ 8.1) the analogue signal is within the
measuring range�

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UK
4���20 mA with setting [OU2] = I or
20���4 mA with setting [OU2] = Ineg�
The measuring range is scalable:
• [ASP] defines at which measured temperature value the analogue signal is
4 mA (OU2 = I) or 20 mA (OU2 = Ineg)�
• [AEP] defines at which measured temperature value the analogue signal is
20 mA (OU2 = I) or 4 mA (OU2 = Ineg)�
Minimum distance between [ASP] and [AEP] = 5 K�
If the measured temperature value is outside the scaled measuring range, the
analogue signal is 20...20.5 mA or 3.8...4 mA (→ Figure 1). When the measured
temperature value continues to increase or decrease, case of diagnostic 5 occurs
(→ 5.3.3)�
160
20
4
3.5
21.5
FOU = OFF
FOU = On
20.5
3.8
I [mA]
-25 0 150
MEWMAW ASP AEP
T [°C]
1
2
Figure 1: Output characteristics analogue output with factory setting
1
Setting [OU2] = I
2
Setting [OU2] = Ineg
MAW = initial value of the measuring range, MEW = final value of the measuring range,
ASP = analogue start point, AEP = analogue end point

8
5.3 Diagnostic function
By measuring with two different, thermically coupled sensor elements (NTC,
PT 1000) the unit automatically detects drifts and errors during temperature
measurement�
A mean average value is formed from the measured individual NTC and Pt 1000
values� This mean value is the basis for the provided measured temperature value
and also the basis for the diagnostic messages with the drift monitoring (→ 5.3.1)�
Besides temperature drift other errors can be detected� Via the parameter drEd
you set which of the diagnostic cases is signalled�
The diagnostic message cases are provided by an analogue signal in 2-wire
operation, in addition by a switching signal or IO-Link diagnostic data in 3-wire
operation�
5.3.1 Drift monitoring
For drift monitoring the unit compares the temperature deviation of sensor element
1 (NTC) and sensor element 2 (Pt 1000) from the mean value� The permissible
temperature deviation is defined by the parameters drW = warning threshold and
drA = alarm threshold� Based on the alarm threshold drA the drift failure threshold
drF is automatically calculated (drF = drA + 3 K)� Setting drA = OFF automatically
results in: drF = 8 K�
When values exceed these thresholds, the unit identifies it as a diagnostic case�
t
T [°K]
3
2
1
drW drA
drF =drA +3K
Figure 2: Drift monitoring
Example: NTC sensor element (1) measures 65 °C, Pt 1000 sensor element (2) measures
60 °C� The mean value (3) is 62�5 °C, i�e� both elements deviate by 2�5 K�
With setting drW = 2 °C and drA = 5 °C a warning message would be provided if drEd = OFF�

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UK
There would not be an alarm message�
Setting range for drW / drA → 10.1
Due to the usual manufacturing tolerances a temperature difference of max�
0�1 K can also occur with new sensor elements� This does not affect the
drift monitoring function�
In case of high temperature changes in the measured medium (e�g� filling
a hot medium into a cold vessel) there may be a short-term difference
between the measured temperature values of both sensor elements�
To avoid short-term drift warnings:
►increase delay time ddr�
5.3.2 Sensor backup (redundancy switching)
If one of the two sensor elements fails (= diagnostic case 4), it is possible to
continue to measure the temperature with the other sensor element that is still
operational� However, drift monitoring is not possible any more�
In 2-wire operation the setting [drEd] = ON must be selected so that the
measured temperature value can be continued to be transferred�

10
5.3.3 Diagnostic cases
Diagnostic case Diagnostic messages
Warning Alarm Failure
1 Drift warning threshold [drW] exceeded
●
2Limit temperature internal electronics
exceeded (+125°C)
●
3 Drift alarm threshold [drA] exceeded
●
4Failure of one of the two sensor
elements
●
5Measured temperature value far
outside the measuring range
●
6Supply voltage outside the operating
range*
●
7Drift failure threshold [drF] exceeded
(→ 5.3.1)
●
8Error during parameter setting via
IO-Link
●
9
Failure of both sensor elements
or
general electronics problems
●
Table 1: Diagnostic cases for 2-wire operation and 3-wire operation
*Exception: For 2-wire operation no diagnostic message is provided in case of undervoltage�
5.3.4 Diagnostic function in 2-wire operation
In 2-wire operation the analogue output is used for temperature measurement and
diagnostics�
With [drEd] the diagnostic cases to be signalled can be set via the analogue
output:

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UK
Diagnostic messages Diagnostic
cases
(→ 5.3.3)
[drEd] Warning Alarm Failure
= ON
●
6���9
= ONdr
● ●
3���9
= OFF
●●●
1���9
Table 2: Setting of diagnostic cases to be signalled (2-wire operation)
- Setting [drEd] = ON provides maximum availability since the transmission of the
measured temperature value is only interrupted for the diagnostic message in diagnostic
cases of category "failure"�
- Setting [drEd] = OFF provides maximum reliability of error detection since a diagnostic
message is provided for every diagnostic case�
To signal a diagnostic case the transfer of the measured temperature data is
interrupted and provided by the following analogue signal depending on the
setting of [FOU]:
[FOU2] = On: 21�5 mA
[FOU2] = OFF: 3�5 mA
In the event of undervoltage (diagnostic case 6 → 5.3.3) no diagnostic
message is provided in 2-wire operation�
5.3.5 Diagnostic function in 3-wire operation
In 3-wire operation the analogue output OUT2 is used for temperature
measurement and diagnostics� In addition a switching output is used via OUT1 for
diagnostics�
When the IO-Link interface is used, all diagnostic cases are always
provided via OUT1� In addition, a signal is provided that corresponds to the
behaviour of the physical switching output�
With [drEd] the diagnostic cases to be signalled can be set via the current output:
Diagnostic messages Diagnos-
tic cases
(→ 5.3.3)
[drEd] Output Warning Alarm Failure
= ON Analogue output
●
6���9
Switching output*
●
6���9

12
Diagnostic messages Diagnos-
tic cases
(→ 5.3.3)
[drEd] Output Warning Alarm Failure
= ONdr Analogue output
●
6���9
Switching output*
● ●
3���9
= OFF Analogue output
●
6���9
Switching output*
●●●
1���9
Table 3: Setting of diagnostic cases to be signalled (3-wire operation)
*
physical switching output as well as a switching output simulated via IO-Link�
Since all diagnostic cases can be signalled via the switching output
in 3-wire operation, the analogue output only leaves its measured
temperature value in diagnostic case of category "failure"� This ensures
maximum use of the analogue output�
The parameter [dOU1] is used to define how the diagnostic output reacts to
diagnostic messages:
Normal Diagnostic message
[dOU1] Warning Alarm Failure
= nc
normally closed
= nc+
normally closed,
extended
2 Hz
= no+
normally open,
extended
2 Hz
= Hb
heartbeat
4 Hz 2 Hz
Table 4: Switching signal in diagnostic case

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5.3.6 Process data transmission in IO-Link operation
In 3-wire operation when the IO-Link interface is used, all diagnostic cases are
described in the IODD of the unit are transmitted� Depending on the setting of
drEd and dOU1 a signal is provided that corresponds to the physical switching
output�
In addition to the diagnostic message the IO-Link interface provides 3 process
values:
(1) Mean value from the individual values of both sensor elements
(2) Measured value of the Pt 1000 sensor element
(3) Measured value of the NTC sensor element
In case of an event the process value transmission is interrupted according to
table 5:
Process value Normal
operation
drW ex-
ceeded
drA ex-
ceeded
Failure of
a sensor
element
Defect of
the unit
(1) Temperature
● ● ● ● x
(2) Temperature Pt
●●●
—
x
(3) Temperature NTC
●●●
—
x
Table 5: Process value transmission via IO-Link
●
Measured value is displayed� (If one sensor element fails: temperature = measured
value of the remaining sensor element�)
—Measured value of the remaining sensor element continues to be provided�
For the failed element, "NoData" is displayed instead of the measured value�
x
"Invalid" is provided instead of the measured value�
List of all diagnostic cases readable via IO-Link (events and errors)
→ IO Device Decription (IODD) at www.ifm.com.

14
6 Installation
►Before installing and removing the unit make sure that no pressure is
applied to the system and there is no medium in the pipe�
►Note dangers related to extreme machine / medium temperatures�
6.1 Units with G1 / Aseptoflex Vario process connection
The unit can be fixed to different process connections�
►Insert the unit with process adapter into the process connection and tighten
using a spanner�
Information about available adapters at www�ifm�com�
►Observe the instructions of the adapter�
►Use a lubricating paste which is suitable and approved for the
application�
►Recommended tightening torque 35 Nm�
6.1.1 Installation using an adapter with sealing ring (hygiene-compliant)
Order no� E332xx / E333xx�
►To meet the hygiene regulations use a process adapter with leakage port�
The adapters are supplied with EPDM O-ring (order no� E30054)�
More sealing rings are available as accessories:
• FKM O-ring (order no� E30123)
• PEEK sealing ring (order no� E30124)� The PEEK sealing ring is long-term
stable and maintenance-free� When you replace the PEEK sealing ring or
change from a PEEK sealing ring to an O-ring the process adapter also needs
to be replaced with a new equivalent adapter�
6.1.2 Installation using a welding adapter with sealing ring (hygiene-
compliant)
►To meet the hygiene regulations use a process adapter with leakage port�
►Make sure that the process adapter does not warp during welding�
The adapter is supplied with EPDM O-ring (order no� E30054)�
Another sealing ring is available as accessory:
• FKM O-ring (order no� E30123)�

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6.1.3 Installation using a process adapter with metal-to-metal seal
Order no� E337xx / E338xx
A long-term stable and maintenance-free fitting without bug traps in the metal-to-
metal seal is only valid for once-only mounting�
If the sealing has to be installed several times, use a new adapter�
6.1.4 Installation to G 1 flange
The process is sealed with the sealing ring at the back of the sensor�
The sealing area at the flange must be flush with the tapped hole and have a
surface characteristic of min� Rz = 6�3�
6.2 Units with process connection G ½ sealing cone
Fitting to the process connection:
Installation using an adapter with metal-to-metal seal
Recommended tightening torque: 30���50 Nm�
6.3 Use in hygienic areas to 3-A
The following applies to units with 3-A
certification:
►Only use adapters with 3-A
certification for the process
connection�
►Do not install the unit at the lowest
point of the pipe or tank (→ position
5) in order that the medium can
run off the area of the measuring
element�

16
6.4 Use in hygienic areas to EHEDG
The sensor is suited for CIP (cleaning in process) when installed correctly�
►Observe the application limits (temperature and material resistance)
according to the data sheet�
►Make sure that the sensor is integrated into the system according to EHEDG:
►Use self-draining installation�
►Only use process adapters permitted according to EHEDG with special seals
required by the EHEDG position paper�
The gasket of the system interface must not be in contact with the
sealing point of the sensor�
►In case of structures in a tank, the installation must be flush mount� If not
possible then direct water jet cleaning and cleaning of dead spaces must be
possible�
►Leakage ports must be clearly visible and must be installed facing downwards
for vertical pipes�
1
D
d
L
►To avoid dead space adhere to the
dimensions:
L < (D - d)�
1: leakage port

17
UK
7 Electrical connection
The unit must be connected by a qualified electrician�
The national and international regulations for the installation of electrical
equipment must be adhered to�
Voltage supply to EN 50178, SELV, PELV / "supply class 2" to cULus�
►Disconnect power�
►Connect the unit as follows:
2-wire operation 3-wire operation
43
2 1
L+
BN1
WH2 OUT
BN
WH
BK
BU
4
1
3
2OUT2
L+
L
OUT1
Colours to DIN EN 60947-5-2
BK: black, BN: brown, BU: blue, WH: white
Operation as 2-wire unit Operation as 3-wire unit
Pin 2 = OUT
• analogue signal for temperature
and diagnostics
= OUT2
• analogue signal for temperature and
diagnostics
Pin 4 = OUT1
• switching signal for diagnostics
• IO-Link signal for temperature and
diagnostics
8 Parameter setting
Using an IO-Link capable parameter setting tool, the following options are
available:
- Reading current process values�
- Reading, changing and saving current parameter settings and transmitting
them to other units of the same type�
- Read saved diagnostic information (→ 11)�

18
►Connect the unit via the IO-Link interface to a PC or PLC with suitable
parameter setting software�
IO-Link interface for connection of the sensor to a PC → www.ifm.com.
8.1 Adjustable parameters
Uni Setting of the standard unit of measurement: °C or °F�
OU2 Configuration of the analogue signal: I = 4���20 mA or Ineg = 20���4 mA
ASP Analogue start point for measured temperature value
AEP Analogue end point for measured temperature value
drW Drift warning threshold: If this value of the temperature deviation is exceeded, a
diagnostic message of the category "warning" is provided with setting [drEd] =
OFF�
°C/°F = Maximum permitted temperature deviation of both sensor elements from
the mean value� Setting range → 10.1�
OFF = Drift warning deactivated�
drA Drift alarm threshold: If this value of the temperature deviation is exceeded, a
diagnostic message of the category "alarm" is provided with setting [drEd] =
ONdr or OFF�
°C/°F = Maximum permitted temperature deviation of both sensor elements from
the mean value� Setting range → 10.1�
OFF = Drift alarm deactivated�
drF Drift failure threshold: [drF] = drA + 3 K; if this value of the temperature deviation
is exceeded, a diagnostic message of the category "failure" is provided�
• drF cannot be set but results from the setting of drA�
• Setting drA = OFF automatically results in: drF = 8 K
ddr Delay of the drift detection�
ddr = Time span (0�5���300 min) for which a drift value must be above the
warning threshold drW or alarm threshold drA so that a diagnostic signal
is provided�
drEd Setting of the diagnostic cases (→ 5.3.3) for which diagnostic messages are
provided�
ON = Diagnostic cases of the category "failure" are signalled�
ONdr = Diagnostic cases of the categories "alarm" and "failure" are signalled�
OFF = Diagnostic cases of the categories "warning", "alarm" and "failure" are
signalled�

19
UK
FOU2 Response of the analogue signal when a diagnostic case is signalled:
> Instead of the measured temperature value a defined current value according
to Namur NE43 is provided (On: 21�5 mA; OFF: 3�5 mA)
dOU1 Response of the diagnostic switching output when a diagnostic case is signalled:
> Output opens / closes / pulsates depending on the category of the diagnostic
case�
Setting options see Table 4 → 5.3.5
P-n Switching logic for the diagnostic switching output: pnp or npn�
HI Read max� value of the temperature measured in the process�
LO Read min� value of the temperature measured in the process�
Fnr Read fault number → 11 Fault correction�
rES Restoring the factory settings�
It is recommended to note down your own settings before carrying out a
reset (→ 12 Factory setting)�
9 Operation
When the supply voltage is applied, the unit is in the RUN mode after a power-on
delay time of 8 s (= normal operating mode)� It carries out its measurement and
evaluation functions and provides output signals according to the set parameters�
10 Technical data
Technical data and scale drawing at www�ifm�com�
10.1 Setting range for drW / drA
Medium temperature Setting range
-10���100 °C 14���212 °F 0�2���5 K
-25���0 °C -13���32 °F 0�3���5 K
> 100 °C > 212 °F x...5 K (→ chart)

20
0,2
0,3
0,4
0,5
0,6
0,7
0,8
105
100
110
115
120
125
130
135
140
145
150
155
160
[K]
[°C]
221
212
230
239
248
257
266
275
284
293
302
311
320
[°F]
1
2
1: x = minimum value for drW and drA
2: Medium temperature
If the value that has been set for drW or drA is lower than the value x, the
sensor will change it automatically to the value x�
In case of operation in gaseous media the value should be greater than
0�35 °C / 0�6 °F�
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1
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