IFM Electronic TAD 91 Series User manual

Operating instructions
Temperature transmitter
TADx81
TADx91
80261226 / 00 03 / 2017
UK

2
Contents
1 Preliminary note���������������������������������������������������������������������������������������������������3
1�1 Symbols used ������������������������������������������������������������������������������������������������3
2 Safety instructions �����������������������������������������������������������������������������������������������3
3 Getting started �����������������������������������������������������������������������������������������������������4
4 Functions and features ����������������������������������������������������������������������������������������4
5 Function���������������������������������������������������������������������������������������������������������������5
5�1 Analogue function ������������������������������������������������������������������������������������������5
5�2 Diagnostic function ����������������������������������������������������������������������������������������6
5�2�1 Drift monitoring ������������������������������������������������������������������������������������7
5�2�2 Sensor backup (redundancy switching)������������������������������������������������8
5�2�3 Diagnostic cases ����������������������������������������������������������������������������������8
5�2�4 Diagnostic function in 2-wire operation�������������������������������������������������8
5�2�5 Diagnostic function in 3-wire operation�������������������������������������������������9
5�3 IO-Link ���������������������������������������������������������������������������������������������������������10
6 Installation ��������������������������������������������������������������������������������������������������������� 11
6�1 Installation of units with G1 / Aseptoflex Vario process connection������������� 11
6�2 Units with process connection G ½ sealing cone ���������������������������������������� 11
6�3 Use in hygienic areas to 3-A������������������������������������������������������������������������12
6�4 Use in hygienic areas to EHEDG ����������������������������������������������������������������12
7 Electrical connection������������������������������������������������������������������������������������������13
8 Parameter setting ����������������������������������������������������������������������������������������������14
8�1 Adjustable parameters���������������������������������������������������������������������������������14
9 Operation�����������������������������������������������������������������������������������������������������������15
10 Fault correction������������������������������������������������������������������������������������������������16
11 Technical data ��������������������������������������������������������������������������������������������������17
12 Factory setting �������������������������������������������������������������������������������������������������17

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UK
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
• 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 environ-
mental conditions without any restrictions�
• Only use the product for its intended purpose(→ 4 Functions and features)�
• Only use the product for permissible media (→ 11 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�

4
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 (→ 5.1)�
- [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 (→ 5.2.3)�
- [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
7� Configure switching signal for diagnostic case (only 3-wire operation)
- [dOU1]: Output opens / closes / pulsates;
according to setting Table 3 → 5.2.5�
8� Configure output logic for diagnostic output (only 3-wire operation)
- [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 converts it into an analogue output
signal�

5
UK
5 Function
• The unit features an IO-Link interface�
• The unit is designed for two or three-wire operation� Depending on the operat-
ing mode the following output signals are provided:
Operating
mode
Output signals
2 wires OUT: analogue signal for temperature measurement /
analogue signal for diagnostics
3 wires OUT1: switching signal for diagnostics / IO-Link
OUT2: analogue signal for temperature measurement /
analogue signal for diagnostics
5.1 Analogue function
The unit converts the measured temperature value into a temperature-proportional
analogue signal�
In addition the analogue output is used for diagnostics (→ 5.2 Diagnostic func-
tion): The transfer of the measured temperature value is interrupted for diagnostic
messages depending on the operating mode and the setting of drEd and an ana-
logue signal according to NE43 of 3�5 mA (FOU2 = On) or 21�5 mA (FOU2 = OFF)
is provided�
Depending on the parameter setting (→ 8.1) the analogue signal is within the
measuring range�
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

6
temperature value continues to increase or decrease, case of diagnostic 5 occurs
(→ 5.2.3)�
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
5.2 Diagnostic function
By measuring with two different, thermically coupled sensor elements (NTC, PT
1000) the unit automatically detects drifts and errors during temperature measure-
ment�
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 (→ 5.2.1)�
Besides temperature drift other errors can be detected (→ 5.2.3 Diagnostic cas-
es)� Via the parameter drEd you set which of the diagnostic cases is signalled (→
5�2�4 / → 5.2.5)�
The message of diagnostic cases is given by an analogue signal in 2-wire opera-
tion, in addition by a switching signal in 3-wire operation�

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5.2.1 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�
When values exceed these thresholds, the unit identifies it as a diagnostic case
(→ 5.2.3)�
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�
There would not be an alarm message�
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�

8
5.2.2 Sensor backup (redundancy switching)
If one of the two sensor elements fails (= diagnostic case 4 → 5.2.3), it is possible
to continue to measure the temperature with the other sensor element that is still
operational (sensor backup → 10 Fault correction; Fnr 21)� However, drift monitor-
ing is not possible any more�
5.2.3 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
(→ 5.2.1)
●
8Error during parameter setting via
IO-Link
●
9
Failure of both sensor elements
or
general electronics problems
●
*Exception: For 2-wire operation no diagnostic message is provided in case of undervoltage
(→ 5.2.4)�
5.2.4 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
(→ 5.2.3)
[drEd] Warning Alarm Failure
= ON
●
7���9
= ONdr
● ●
3���9
= OFF
●●●
1���9
Table 1: Setting of diagnostic cases to be signalled (2-wire operation)
- Setting [drEd] = ON provides maximum availability since the transmission of the meas-
ured 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 → 5.2.3) no diagnostic
message is provided in 2-wire operation�
5.2.5 Diagnostic function in 3-wire operation
In 3-wire operation the analogue output is used for temperature measurement and
diagnostics� In addition a switching output is used for diagnostics�
With [drEd] the diagnostic cases to be signalled can be set via the current output:
Diagnostic messages Diagnos-
tic cases
(→ 5.2.3)
[drEd] Output Warning Alarm Failure
= ON Analogue output
●
7���9
Switching output
●
7���9
= ONdr Analogue output
●
7���9
Switching output
● ●
3���9
= OFF Analogue output
●
7���9
Switching output
● ● ●
1���9
Table 2: Setting of diagnostic cases to be signalled (3-wire operation)

10
Since all diagnostic cases can be signalled via the switching output in
3-wire operation, the analogue output only leaves its measured tempera-
ture 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 diag-
nostic 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 3: Switching signal in diagnostic case
5.3 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 during operation� Operation of the unit via IO-Link interface requires an IO-
Link capable module (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�

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UK
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�
Information about the available adapters at www�ifm�com�
►Observe the instructions of the adapter�
►Use a lubricating paste which is suitable and approved for the
application�
6.1 Installation of units with G1 / Aseptoflex Vario process
connection
The following options are possible for fitting to the process connection:
• installation using an adapter with metal-to-metal seal
• Installation using an adapter with sealing ring
• Installation to G 1 flange:
The sealing ring on the sensor is used as process seal� The upper sealing
area on the process connection must be flush with the tapped hole and have a
surface characteristic of min� Rz 6�3�
Recommended tightening torque: 35 Nm�
For use of adapters with leakage port:
►Mount the sensor horizontally or slightly diagonally (positions 2 to 4, see Figure
→ 6.3)
►Align the leakage port so that it is located at the lowest possible point�
6.2 Units with process connection G ½ sealing cone
Adaptation to the process connection: Installation using an adapter with met-
al-to-metal seal
Recommended tightening torque: 30���50 Nm�

12
6.3 Use in hygienic areas to 3-A
The following applies to units with 3-A
certification:
►Only use adapters with A-3
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�
6.4 Use in hygienic areas to EHEDG
►Make sure that the sensors are integrated into the system in accordance with
EHEDG�

13
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 1 L+ L+
Pin 2 = OUT
analogue signal for temperature and
diagnostics
= OUT2
analogue signal for temperature and
diagnostics
Pin 3 L-
Pin 4 = OUT1
switching signal for diagnostics / IO-Link

14
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 (→ 10)�
►Connect the unit via the IO-Link interface to a PC or PLC with suitable parame-
ter 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: 0�2���5 °C / 0�4���9 °F�
In case of operation in gaseous media the value should be greater than
0�35 °C / 0�6 °F�
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: 0�2���5 °C / 0�4���9 °F�
In case of operation in gaseous media the value should be greater than
0�35 °C / 0�6 °F�
OFF = Drift alarm deactivated�

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UK
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 (→ 5.2.3) 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�
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 3 → 5.2.5
P-n Switching logic for the diagnostic 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 → 10 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�

16
10 Fault correction
In case of faults or anomalies:
►Connect unit with a PC�
►Read [Fnr]�
Fnr Type of fault Corrective measures
0 No fault, no anomaly occurred� -/-
20 Internal malfunction in the sensor
electronics�
►Replace the unit�
21 Backup function of the sensor activated,
e�g� a sensor element has failed
(diagnostic case 4 → 5.2.3)
►Replace the unit�
►Continue measurement with only one
sensor element (backup function):
- In 2-wire operation set [drEd] = ON so
that the measured temperature value
can be continued to be transferred�
Then the analogue output only pro-
vides diagnostic cases of the category
"alarm"�
- In 3-wire operation all diagnostic cas-
es can be signalled via the diagnostic
switching output except those used for
drift monitoring (diagnostic cases 1, 3,
7 → 5.2.3)�
30 Wiring fault ►Check wiring�
42 Analogue signal 21�5 mA (FOU2 = On)
or 3�5 mA (FOU2 = OFF)
> The switch point is clearly outside
the measuring range�
►Check measuring range�
►Adapt [ASP] value and [AEP] vaule to
the operating conditions�
71 Detected sensor drift exceeds warning
level [drW]
First indication of drift detected�
►Check whether the parameter [drW]
is programmed correctly�
►Prepare replacement of the unit�
72 Detected sensor drift exceeds alarm
level [drA]
Drift exceeds alarm threshold�
Temperature measurement with reduced
accuracy possible�
►Check whether the parameter [drA] is
programmed correctly�
►Replace the unit�

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UK
Fnr Type of fault Corrective measures
91 Supply voltage outside the operating
voltage range�
►Check the supply voltage; ensure a
correct voltage supply�
92 Operating temperature of the electronics
outside the specified range�
►Check the temperature of the upper
part of the unit�
►Adhere to the specified temperature
range�
100 Error during parameter setting via IO-
Link (set value of a parameter outside
the valid range)�
►Repeat parameter setting with
admissible parameter values or make
a reset (reset all parameters to the
factory setting)�
ASP = analogue start point; AEP = analogue end point
11 Technical data
Technical data and scale drawing at www�ifm�com�
12 Factory setting
Factory setting User setting
OU2 I
ASP 0 °C
AEP 150 °C
drW 0�2 °C
drA 0�5 °C
ddr 30 min
drEd Ondr
dOU1 nc+
FOU2 On
p-n PnP
Uni °C
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1
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