Endress+Hauser iTHERM TM411 Manual

Easy-to-use imperial version with outstanding
sensor technology
Applications
• Specially designed for use in hygienic and aseptic applications in the Food &
Beverages and Life Sciences industries
• Measuring range: –200 to +600 °C (–328 to +1 112 °F)
• Pressure range up to 40 bar (580 psi)
• Protection class: up to IP69K
Head transmitter
All Endress+Hauser transmitters are available with enhanced accuracy and reliability
compared to directly wired sensors. Easy customizing by choosing one of the
following outputs and communication protocols:
• Analog output 4 to 20 mA, HART®
• PROFIBUS® PA, FOUNDATION Fieldbus™
Your benefits
• User-friendly and reliable from product selection to maintenance
• iTHERM inserts: globally unique, automated production. Full traceability and
consistently high product quality for reliable measured values
• iTHERM QuickSens: fastest response times (t90s: 1.5 s) for optimum process control
• iTHERM StrongSens: unsurpassed vibration resistance (> 60g) for ultimate plant
safety
• iTHERM QuickNeck – cost and time savings thanks to simple, tool-free
recalibration
• iTHERM TA30R: 316L terminal head for easier handling and lower installation
and maintenance costs, and with highest IP69K rating
• International certification: explosion protection e.g. ATEX/IECEx/FM/CSA and in
compliance with hygiene standards according to 3-A®, EHEDG, ASME BPE, FDA,
TSE Certificate of Suitability
Products Solutions Services
Technical Information
iTHERM TM412
Trend-setting, modular resistance thermometer
for hygienic and aseptic applications
TI01348T/09/EN/01.17
71362828

iTHERM TM412
2 Endress+Hauser
Table of contents
Function and system design ................... 3
iTHERM Hygiene line ........................... 3
Measuring principle ............................ 3
Measuring system ............................. 4
Modular design ............................... 5
Input ..................................... 6
Measured variable ............................. 6
Measuring range .............................. 6
Output ................................... 6
Output signal ................................ 6
Family of temperature transmitters ................. 6
Wiring ................................... 7
Wiring diagrams for RTD ........................ 7
Cable entries ................................ 8
Connectors .................................. 9
Overvoltage protection ......................... 11
Performance characteristics .................. 11
Reference conditions .......................... 11
Maximum measured error ....................... 11
Influence of ambient temperature ................. 12
Self heating ................................ 12
Response time .............................. 12
Calibration ................................. 13
Insulation resistance .......................... 15
Installation ............................... 15
Orientation ................................ 15
Installation instructions ........................ 15
Environment .............................. 18
Ambient temperature range ..................... 18
Storage temperature .......................... 18
Humidity .................................. 18
Climate class ............................... 18
Degree of protection .......................... 18
Shock and vibration resistance .................... 18
Electromagnetic compatibility (EMC) ............... 18
Process .................................. 18
Process temperature range ...................... 18
Thermal shock .............................. 18
Process pressure range ......................... 18
Medium - state of aggregation .................... 19
Mechanical construction .................... 20
Design, dimensions ........................... 20
Weight ................................... 24
Material .................................. 24
Surface roughness ............................ 24
Terminal heads .............................. 24
Extension neck .............................. 28
Process connections ........................... 29
Tip shape ................................ 31
Certificates and approvals ................... 33
CE mark ................................... 33
Hygiene standard ............................ 33
Ex approval ................................ 33
Other standards and guidelines ................... 33
Parts in contact with the medium .................. 33
Surface purity ............................... 33
Material resistance ........................... 33
Material certification .......................... 33
Calibration ................................. 33
Protection tube testing and load capacity calculation ..... 34
Ordering information ....................... 34
Accessories ............................... 35
Device-specific accessories ...................... 35
Communication-specific accessories ................ 37
Service-specific accessories ...................... 38
System components ........................... 38
Documentation ............................ 39

iTHERM TM412
Endress+Hauser 3
Function and system design
iTHERM Hygiene line This thermometer is part of the product line of modular thermometers for hygienic and aseptic
applications.
Differentiating factors when selecting a suitable thermometer
TM4x1TM4x2
Metric version Imperial version
↓ ↓
TM41x characterizes the device that uses cutting-edge technology, with features such as a replaceable insert,
quick-fastening extension neck (iTHERM QuickNeck), vibration-resistant and fast-response sensor technology
(iTHERM StrongSens and QuickSens) and approval for use in hazardous areas
TM411
mm
A0018239
TM412
inch
A0018691
↓ ↓
TM40x characterizes the device that uses basic technology, with features such as a fixed, non-replaceable
insert, application in non-hazardous areas, standard extension neck, low-cost unit
TM401
mm
A0018692
TM402
inch
A0018693
Measuring principle Resistance thermometer (RTD)
These resistance thermometers use a Pt100 temperature sensor according to IEC 60751. The
temperature sensor is a temperature-sensitive platinum resistor with a resistance of 100 Ω at
0 °C (32 °F) and a temperature coefficient α = 0.003851 °C-1.

iTHERM TM412
4 Endress+Hauser
There are generally two different kinds of platinum resistance thermometers:
• Wire wound (WW): Here, a double coil of fine, high-purity platinum wire is located in a ceramic
support. This is then sealed top and bottom with a ceramic protective layer. Such resistance
thermometers not only facilitate very reproducible measurements but also offer good long-term
stability of the resistance/temperature characteristic within temperature ranges up to
600 °C (1 112 °F). This type of sensor is relatively large in size and it is comparatively sensitive to
vibrations.
•Thin film platinum resistance thermometers (TF): A very thin, ultrapure platinum layer,
approx. 1 μm thick, is vaporized in a vacuum on a ceramic substrate and then structured
photolithographically. The platinum conductor paths formed in this way create the measuring
resistance. Additional covering and passivation layers are applied and reliably protect the thin
platinum layer from contamination and oxidation, even at high temperatures.
The primary advantages of thin film temperature sensors over wire wound versions are their smaller
sizes and better vibration resistance. A relatively low principle-based deviation of the resistance/
temperature characteristic from the standard characteristic of IEC 60751 can frequently be observed
among TF sensors at high temperatures. As a result, the tight limit values of tolerance category A as
per IEC 60751 can only be observed with TF sensors at temperatures up to approx. 300 °C (572 °F).
Measuring system Endress+Hauser offers a complete portfolio of optimized components for the temperature measuring
point – everything you need for the seamless integration of the measuring point into the overall
facility. This includes:
• Power supply unit/barrier
• Display units
• Data managers
• Overvoltage protection
For more information, see the brochure 'System Products and Data Managers - Solutions for the
loop' (FA00016K)
FieldCare
Memograph M
RSG45
RIA15
TM4xx
PLC
A0033768
 1 Example of application, measuring point layout with additional Endress+Hauser components

iTHERM TM412
Endress+Hauser 5
• iTHERM TM4x2: Installed RTD thermometer with integrated HART® head transmitter
• Display unit RIA15:
- Display of 4 to 20 mA measured values or HART® process variables
- Loop-powered
- Voltage drop ≤1 V (HART® ≤1.9 V)
• Data Management Memograph M RSG45:
- Tamper-proof data storage and access (FDA 21 CFR 11)
- HART® gateway functionality; Up to 40 HART® devices connected at a time
- Communication capabilities: Modbus, Profibus DP, PROFINET, EtherNet/IP
• PLC / FieldCare: Field Data Manager Software MS20 - Automatic service for report generation,
printing reports, read out of data, storing of data, secure export, pdf generation Read out
measured data via online interface or from mass storage Online visualization of instantaneous
values (“live data”) . More information on this can be found in the Technical Information, see
"Documentation".
Modular design
Design Options
7
U
5
6
1
2
3
4
A0034469
1: Terminal
head →  24
• 316L, high or low head, optionally with display window
• Aluminum, high or low head, with or without display window
• Polypropylene, low head
• Polyamide, high head, without display window
Your benefits:
• Optimum terminal access thanks to low housing edge of bottom
section:
– Easier to use
– Lower installation and maintenance costs
• Optional display: local process display unit for added reliability
• IP69K protection: optimum protection even with high-pressure
cleaning
2: Wiring,
electrical
connection,
output signal
→  6
• Ceramic terminal block
• Flying leads
• Head transmitter (4 to 20 mA, HART®, PROFIBUS® PA,
FOUNDATION™ Fieldbus), single-channel or two-channel
• Attachable display (optional)
3: Connector or
cable gland
→  28
• PROFIBUS® PA / FOUNDATION™ Fieldbus connector, 4-pin
• 8-pin connector
• Polyamide cable glands
4: Extension
neck →  28
Quick fastener iTHERM QuickNeck or NPT 1/2"
Your benefits:
•iTHERM QuickNeck: tool-free removal of the insert:
– Saves time/costs on frequently calibrated measuring points
– Wiring mistakes avoided
• IP69K protection: safety under extreme process conditions
5: Process
connection
→  29
Wide range of different versions.

iTHERM TM412
6 Endress+Hauser
Design Options
6: Thermowell • Various diameters
• Various tip shapes (straight or reduced)
7: Insert
→  23
Sensor models: wire wound (WW) or thin-film sensor (TF).
Your benefits:
•iTHERM QuickSens - insert with the world's fastest response
time:
– Insert: 3 mm (0.12 in) or 6 mm (0.24 in)
– Fast, highly accurate measurements, delivering maximum
process safety and control
– Quality and cost optimization
– Minimization of necessary immersion length: better product
protection thanks to improved process flow
•iTHERM StrongSens - insert with unbeatable durability:
– Vibration resistance > 60g: lower life cycle costs thanks to
longer operating life and high plant availability
– Automated, traceable production: top quality and maximum
process safety
– High long-term stability: reliable measured values and high
level of system safety
Input
Measured variable Temperature (temperature-linear transmission behavior)
Measuring range Depends on the type of sensor used
Sensor type Measuring range
Pt100 thin-film –50 to +200 °C (–58 to +392 °F)
Pt100 thin-film, iTHERM
StrongSens, vibration-
resistant > 60g
–50 to +500 °C (–58 to +932 °F)
Pt100 thin-film, iTHERM
QuickSens, fast-response
–50 to +200 °C (–58 to +392 °F)
Pt100 wire wound, extended
measuring range
–200 to +600 °C (–328 to +1 112 °F)
Output
Output signal Generally, the measured value can be transmitted in one of two ways:
• Directly-wired sensors - sensor measured values forwarded without a transmitter.
• Via all common protocols by selecting an appropriate Endress+Hauser iTEMP temperature
transmitter. All the transmitters listed below are mounted directly in the terminal head and wired
with the sensory mechanism.
Family of temperature
transmitters
Thermometers fitted with iTEMP transmitters are an installation-ready complete solution to
improve temperature measurement by significantly increasing accuracy and reliability, when
compared to direct wired sensors, as well as reducing both wiring and maintenance costs.
PC programmable head transmitters
They offer a high degree of flexibility, thereby supporting universal application with low inventory
storage. The iTEMP transmitters can be configured quickly and easily at a PC. Endress+Hauser offers
free configuration software which can be downloaded from the Endress+Hauser Website. More
information can be found in the Technical Information. →  39

iTHERM TM412
Endress+Hauser 7
HART® programmable head transmitters
The transmitter is a 2-wire device with one or two measuring inputs and one analog output. The
device not only transfers converted signals from resistance thermometers and thermocouples, it also
transfers resistance and voltage signals using HART® communication. It can be installed as an
intrinsically safe apparatus in Zone 1 hazardous areas and is used for instrumentation in the
terminal head (flat face) as per DIN EN 50446. Swift and easy operation, visualization and
maintenance by using universal device configuration tools like FieldCare, DeviceCare or
FieldCommunicator 375/475. For more information, see the Technical Information. →  39
PROFIBUS® PA head transmitters
Universally programmable head transmitter with PROFIBUS® PA communication. Conversion of
various input signals into digital output signals. High accuracy over the complete ambient
temperature range. The configuration of PROFIBUS PA functions and of device-specific parameters is
performed via fieldbus communication. For more information, see the Technical Information.
→  39
FOUNDATION Fieldbus™ head transmitters
Universally programmable head transmitter with FOUNDATION Fieldbus™ communication.
Conversion of various input signals into digital output signals. High accuracy over the complete
ambient temperature range. All transmitters are released for use in all important process control
systems. The integration tests are performed in Endress+Hauser's "System World". For more
information, see the Technical Information. →  39
Advantages of the iTEMP transmitters:
• Dual or single sensor input (optionally for certain transmitters)
• Unsurpassed reliability, accuracy and long-term stability in critical processes
• Mathematical functions
• Monitoring of the thermometer drift, sensor backup functionality, sensor diagnostic functions
• Sensor-transmitter matching for dual sensor input transmitter, based on Callendar/Van Dusen
coefficients
Wiring
• According to the 3-A® Standard electrical connecting cables must be smooth, corrosion-
resistant and easy to clean.
• Grounding or shield connections are possible via special ground terminals on the terminal
head.
Wiring diagrams for RTD Type of sensor connection
Head mounted transmitter TMT18x (single input)
3
5
6
RTD
3
4
5
6
RTD
1
2
3-wire 4-wire
Power supply
head transmitter and
analog output 4 to 20 mA,
or bus connection
(red) (red)
(red) (red)
(white) (white)
(white)
mA
A0016433-EN

iTHERM TM412
8 Endress+Hauser
Head mounted transmitter TMT8x (dual input)
-
+
+
1
-
2
7
6
5
4
3
1
2
7
6
5
4
3
Sensor input 2 Sensor input 1
RTD 4- and 3-wire:
RTD 3-wire:
Bus connection
and supply voltage
Display connection
white
red
red
white
green
black
black
A0034449-EN
Terminal block mounted
3-wire single 2 x 3-wire single 4-wire single
Outside screw
Red1
Red3
White5 White3
Red1
Red2
Black5
Black6
Green4
Red1
Red3
White4
White6
A0034451-EN
Head mounted field transmitter TMT162 (dual input)
+
-
1
2
3
4
5
6
+
-
3
4
S1
3
S2
-
+
+
-
#
(white)
(white) (red)
(red) RTD
RTD
RTD
Sensor 1
Sensor 2
3
31
142
2
(black) 5
(black) 6
(green) 4
Sensor 1
Sensor 2
3-wire 4-wire
Power supply
field transmitter and
analog output
4 to 20 mA,
or bus connection
A0034450-EN
Cable entries See the 'Terminal head' section

iTHERM TM412
Endress+Hauser 9
Connectors Endress+Hauser offers a wide variety of connectors for the simple and fast integration of the
thermometer into a process control system. The following tables show the PIN assignments of the
various plug connector combinations.
Abbreviations
#1 Order: first transmitter/insert #2 Order: second
transmitter/insert
i Insulated. Wires marked 'i' are not connected and are
insulated with heat shrink tubes.
YE Yellow
GND Grounded. Wires marked 'GND' are connected to the
internal grounding screw in the terminal head.
RD Red
BN Brown WH White
GNYE Green-yellow PK Pink
BU Blue GN Green
GY Gray BK Black
Terminal head with one cable entry
Plug 1x PROFIBUS PA 1x FOUNDATION™
Fieldbus (FF) 8-pin
Plug thread M12 7/8" 7/8" M12
PIN number 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 5 6 7 8
Electrical connection (terminal head)
Flying leads Not connected (not insulated)
3-wire terminal
block (1x Pt100) RD RD
WH
RD RD
WH
RD RD
WH
RD RD
WH
i
4-wire terminal
block (1x Pt100)
WH WH WH WH WH WH WH WH
6-wire terminal
block (2x Pt100)
RD
(#1)
1)
RD
(#1)
1) WH (#1) 1) RD
(#1)
1)
RD
(#1)
1) WH (#1) 1) RD
(#1)
1)
RD
(#1)
1) WH (#1) 1) WH BK BK YE
1x TMT 4 to 20
mA or HART®+ i - i + i - i + i - i
+
(#1) i- (#1) i
i
2x TMT 4 to 20
mA or HART® in
the terminal
head with a high
cover
+
(#1)
+
(#2)
-
(#1)
-
(#2)
+
(#1)
+
(#2)
-
(#1)
-
(#2)
+
(#1)
+
(#2)
-
(#1)
-
(#2)
+
(#2) i- (#2) i
1x TMT
PROFIBUS® PA +
i
-GND
2)
+
i
-GND
2) Cannot be combined Cannot be combined
2x TMT
PROFIBUS® PA
+
(#1)
-
(#1) + -
1x TMT FF
Cannot be combined Cannot be combined
- +
GND i Cannot be combined
2x TMT FF -
(#1)
+
(#1)
PIN position and
color code
1 BN
2 GNYE
3 BU
4 GY
1
4 3
2
A0018929
1 BN
2 GNYE
3 BU
4 GY
1
4
3
2
A0018930
1 BU
2 BN
3 GY
4 GNYE
1
4
3
2
A0018931
1 WH
2 BN
3 GN
4 YE
5 GY
6 PK
7 BU
8 RD
A0018927
1) Second Pt100 is not connected
2) If a plastic housing TA30S or TA30P is used, insulated 'i' instead of grounded GND

iTHERM TM412
10 Endress+Hauser
Terminal head with two cable entries
Plug 2x PROFIBUS® PA 2x FOUNDATION™ Fieldbus (FF)
Plug thread
#1 #2
A0021706
M12(#1) / M12(#2) 7/8"(#1) / 7/8"(#2) 7/8"(#1) / 7/8"(#2)
PIN number 1 2 3 4 1 2 3 4 1 2 3 4
Electrical connection (terminal head)
Flying leads Not connected (not insulated)
3-wire terminal block (1x Pt100) RD/i RD/i WH/i RD/i RD/i WH/i RD/i RD/i WH/i
4-wire terminal block (1x Pt100) WH/i WH/i WH/i WH/i WH/i WH/i
6-wire terminal block (2x Pt100) RD/BK RD/BK WH/YE RD/BK RD/BK WH/YE RD/BK RD/BK WH/YE
1x TMT 4 to 20 mA or HART®+/i
i/i
-/i
i/i
+/i
i/i
-/i
i/i
+/i
i/i
-/i
i/i
2x TMT 4 to 20 mA or HART® in the
terminal head with a high cover
+(#1)/
+(#2)
-(#1)/
-(#2)
+(#1)/
+(#2)
-(#1)/
-(#2)
+(#1)/
+(#2)
-(#1)/
-(#2)
1x TMT PROFIBUS® PA +/i -/i GND/
GND
+/i -/i GND/
GND Cannot be combined
2x TMT PROFIBUS® PA +(#1)/
+(#2)
-(#1)/
-(#2)
+(#1)/
+(#2)
-(#1)/
-(#2)
1x TMT FF
Cannot be combined Cannot be combined
-/i +/i
i/i GND/
GND
2x TMT FF -(#1)/
-(#2)
+(#1)/
+(#2)
PIN position and color code
1 BN
2 GNYE
3 BU
4 GY
1
4 3
2
A0018929
1 BN
2 GNYE
3 BU
4 GY
1
4
3
2
A0018930
1 BU
2 BN
3 GY
4 GNYE
1
4
3
2
A0018931
Connection combination: insert - transmitter
Insert Transmitter connection 1)
1x 1-channel 2x 1-channel 2) 1x 2-channel 2x 2-channel 2)
1x Pt100, flying
leads Pt100 (#1) : transmitter (#1)
Pt100 (#1) : transmitter (#1)
(Transmitter (#2) not
connected)
Pt100 (#1) : transmitter (#1) Pt100 (#1) : transmitter (#1)
Transmitter (#2) not connected
2x Pt100, flying
leads
Pt100 (#1) : transmitter (#1)
Pt100 (#2) insulated
Pt100 (#1) : transmitter (#1)
Pt100 (#2): transmitter (#2)
Pt100 (#1) : transmitter (#1)
Pt100 (#2) : transmitter (#1)
Pt100 (#1) : transmitter (#1)
Pt100 (#2) : transmitter (#1)
(Transmitter (#2) not
connected)
1x Pt100 with
terminal block 2) Pt100 (#1) : transmitter in cover
Cannot be combined
Pt100 (#1) : transmitter in
cover
Cannot be combined
2x Pt100 with
terminal block 2)
Pt100 (#1) : transmitter in
cover
Pt100 (#2) not connected
Pt100 (#1) : transmitter in
cover
Pt100 (#2) : transmitter in
cover
1) If 2 transmitters are selected in a terminal head, transmitter #1 is installed in the high cover. A TAG cannot be ordered for the 2nd transmitter as
standard. The bus address is set to the default value and, if necessary, must be changed manually before commissioning.
2) Only in the terminal head with a high cover, only 1 transmitter possible. A ceramic terminal block is automatically fitted on the insert.

iTHERM TM412
Endress+Hauser 11
Overvoltage protection To protect against overvoltage in the power supply and signal/communication cables for the
thermometer electronics, Endress+Hauser offers the HAW562 surge arrester for DIN rail mounting
and the HAW569 for field housing installation.
For more information see the Technical Information 'HAW562 Surge arrester' TI01012K and
'HAW569 Surge arrester' TI01013K.
Performance characteristics
Reference conditions These data are relevant for determining the accuracy of the temperature transmitters used. More
information on this can be found in the Technical Information of the iTEMP temperature
transmitters.
Maximum measured error RTD resistance thermometer corresponding to IEC 60751
Class max. Tolerances (°C) Characteristics
RTD maximum error type TF
Cl. A ± (0.15 + 0.002 · |t| 1))
A
AA
-200 -100 0 100 200 300 400 500 600°C
0.5
1.0
1.5
2.0
B
2.5
3.0
- 0.5
- 1.0
- 1.5
- 2.0
- 2.5
- 3.0
B
A
AA
Max. deviation (°C)
Max. deviation (°C)
A0008588-EN
Cl. AA,
former 1/3
Cl. B
± (0.1 + 0.0017 · |t|) 1)
Cl. B ± (0.3 + 0.005 · |t| 1))
1) |t| = absolute value °C
For measurement errors in °F, calculate using equations in °C, then multiply the outcome by 1.8.
Temperature ranges
Sensor type Operating
temperature range
Class B Class A Class AA
iTHERM
StrongSens
–50 to 500 °C
(–58 to 932 °F)
- –30 to 300 °C
(–22 to 572 °F)
0 to 200 °C
(32 to 392 °F)
iTHERM
QuickSens
–50 to 200 °C
(–58 to 392 °F)
- –30 to 200 °C
(–22 to 392 °F)
0 to 200 °C
(32 to 392 °F)

iTHERM TM412
12 Endress+Hauser
Sensor type Operating
temperature range
Class B Class A Class AA
Pt100 thin film
sensor (TF)
–50 to 200 °C
(–58 to 392 °F)
–50 to 200 °C
(–58 to 392 °F)
–30 to 200 °C
(–22 to 392 °F)
-
Pt100 wire-
wound sensor
(WW)
–200 to 600 °C
(–328 to 1 112 °F)
- –100 to 450 °C
(–148 to 842 °F)
–50 to 250 °C
(–58 to 482 °F)
Influence of ambient
temperature
Depends on the head transmitter used. For details, see Technical Information. →  39
Self heating RTD elements are passive resistances that are measured using an external current. This
measurement current causes a self-heating effect in the RTD element itself which in turn creates an
additional measurement error. In addition to the measurement current, the size of the measurement
error is also affected by the temperature conductivity and flow velocity of the process. This self-
heating error is negligible when an Endress+Hauser iTEMP temperature transmitter (very small
measurement current) is connected.
Response time Tests in water at 0.4 m/s (1.3 ft/s), according to IEC 60751; 10 K temperature step change.
Response time without heat transfer paste 1)
Protection tube Shape of tip Insert
1x Pt100
iTHERM
QuickSens,
TF
1x Pt100
iTHERM
StrongSens
, TF
1x Pt100
wire
wound
WW
2x Pt100
wire
wound
WW
1x Pt100
standard
thin-film
TF
2x Pt100
standard
thin-film
TF
t50 t90 t50 t90 t50 t90 t50 t90 t50 t90 t50 t90
6.35 mm (¹⁄₄ in) Reduced 4.76 mm (³⁄₁₆ in)
x 19.05 mm (0.75 in) 3 mm (0.12 in) 1.6 s 5.9 s - - 7.8 s 21.8 s 7.8 s 21.8 s - - - -
9.53 mm (³⁄₈ in)
Straight 6 mm (0.24 in) 8.5 s 47 s 25.9 s 80.9 s - - - - - - - -
Straight 6.35 mm (¹⁄₄ in) - - - - 23.6 s 67 s 21.8 s 65.2 s 18.4 s 55.8 s 18.4 s 55.8 s
Reduced 4.76 mm (³⁄₁₆ in)
x 19.05 mm (0.75 in) 3 mm (0.12 in) 1.5 s 5.5 s - - 8.4 s 23 s 8.4 s 23 s - - - -
12.7 mm (¹⁄₂ in)
Straight 6 mm (0.24 in) 8.2 s 34.8 s 23.4 s 70.6 s - - - - - - - -
Straight 6.35 mm (¹⁄₄ in) - - - - 20.1 s 55.4 s 21.3 s 61.8 s 17.9 s 51.5 s 17.9 s 51.5 s
Reduced 4.76 mm (³⁄₁₆ in)
x 19.05 mm (0.75 in) 3 mm (0.12 in) 1.8 s 6.2 s - - 8.8 s 24.1 s 8.8 s 24.1 s - - - -
1) If using a protection tube.
Response time for directly wired insert without transmitter.

iTHERM TM412
Endress+Hauser 13
Calibration Calibration of thermometers
Calibration involves comparing the measured values of a device under test (DUT) with those of a
more precise calibration standard using a defined and reproducible measurement method. The aim is
to determine the deviation of the DUT's measured values from the true value of the measured
variable. Two different methods are used for thermometers:
• Calibration at fixed-point temperatures, e.g. at the freezing point of water at 0 °C,
• Calibration compared against a precise reference thermometer.
The thermometer to be calibrated must display the fixed point temperature or the temperature of
the reference thermometer as accurately as possible. Temperature-controlled calibration baths with
very homogeneous thermal values, or special calibration furnaces into which the DUT and the
reference thermometer, where necessary, can project to a sufficient degree, are typically used for
thermometer calibrations.
The measurement uncertainty can increase due to heat dissipation errors and short immersion
lengths. The existing measurement uncertainty is listed on the individual calibration certificate.
For accredited calibrations according to ISO17025, the measurement uncertainty shouldn’t be twice
as high as the accredited measurement uncertainty. If this is exceeded, only a factory calibration can
be performed.
Evaluation of thermometers
If a calibration with an acceptable uncertainty of measurement and transferable measurement
results is not possible, Endress+Hauser offers customers a thermometer evaluation measurement
service, if technically feasible. This is the case when:
• The process connections/flanges are too big or the immersion length (IL) is too short to allow the
DUT to be immersed sufficiently in the calibration bath or furnace (see the following table), or
• Due to heat conduction along the thermometer tube, the resulting sensor temperature generally
deviates significantly from the actual bath/furnace temperature.
The measured value of the DUT is determined using the maximum possible immersion depth and the
specific measuring conditions and measurement results are documented on an evaluation certificate.
Sensor transmitter matching
The resistance/temperature curve of platinum resistance thermometers is standardized but in
practice it is rarely possible to keep to the values precisely over the entire operating temperature
range. For this reason, platinum resistance sensors are divided into tolerance classes, such as Class
A, AA or B as per IEC 60751. These tolerance classes describe the maximum permissible deviation of
the specific sensor characteristic curve from the standard curve, i.e. the maximum temperature-
dependent characteristic error that is permitted. The conversion of measured sensor resistance
values to temperatures in temperature transmitters or other meter electronics is often susceptible to
considerable errors as the conversion is generally based on the standard characteristic curve.
When using temperature transmitters from Endress+Hauser, this conversion error can be reduced
significantly by sensor-transmitter matching:
• Calibration at three temperatures at least and determination of the actual temperature sensor
characteristic curve,
• Adjustment of the sensor-specific polynomial function using Calendar-van Dusen (CvD)
coefficients,
• Configuration of the temperature transmitter with the sensor-specific CvD coefficients for
resistance/temperature conversion, and
• another calibration of the reconfigured temperature transmitter with connected resistance
thermometer.
Endress+Hauser offers this kind of sensor-transmitter matching as a separate service. Furthermore,
the sensor-specific polynomial coefficients of platinum resistance thermometers are always provided
on every Endress+Hauser calibration certificate where possible, e.g. at least three calibration points,
so that users themselves can also appropriately configure suitable temperature transmitters.
For the device, Endress+Hauser offers standard calibrations at a reference temperature of
–20 to +500 °C (–4 to +932 °F) based on the ITS90 (International Temperature Scale). Calibrations in
other temperature ranges are available from your Endress+Hauser sales center on request.
Calibrations are traceable to national and international standards. The calibration certificate is
referenced to the serial number of the device. Only the insert is calibrated.
Minimum insertion length (IL) for inserts required to perform a correct calibration
The insert length IL is automatically calculated for every thermometer configuration in the
Endress+Hauser Configurator+Temperature software application. The system also automatically
checks whether the selected insert length suffices to perform a factory calibration. For further
information, see the 'Accessories' section →  38

iTHERM TM412
14 Endress+Hauser
Due to restrictions of the bath geometries, minimum immersion lengths must be maintained at high
temperatures in order to be able to perform a calibration with acceptable measurement uncertainty.
The same applies when a temperature head transmitter is used. Due to the heat dissipation,
minimum immersion lengths must be maintained in order to ensure the functionality of the
transmitter –40 to +85 °C (–40 to +185 °F).
Minimum insertion length (IL):
Calibration temperature Minimum immersion length (IL)
–196 °C (–320.8 °F) 120 mm (4.72 in) 1)
+80 to +250 °C (+112 to +482 °F) No minimum immersion length needed
+251 to +550 °C (+483 to +1 022 °F) 300 mm (11.8 in)
+551 to +600 °C (+1 023 to +1 112 °F) 400 mm (15.8 in)
1) with temperature head transmitter min. 150 mm (5.91 in) needed
IL IL*
ΔL
A0033648
 2 Insertion lengths for sensor calibration
IL Insertion length for factory calibration or recalibration onsite without the iTHERM QuickNeck extension neck
IL* Insertion length for recalibration onsite with the iTHERM QuickNeck extension neck
ΔL Additional length, depending on the calibration unit, if the insert cannot be fully immersed
• To check the actual accuracy rating of the thermometers installed, a cyclic calibration of the
installed sensor needs to be performed frequently. The insert is normally removed for comparison
with a precise reference thermometer in the calibration bath (see graphic, left part).
A reproducible calibration requires the insert to have a minimum insertion length IL. If the insert
is shorter than this minimum length, this reproducibility cannot be guaranteed.
• The iTHERM QuickNeck enables quick, tool-free removal of the insert for calibration purposes. The
entire upper part of the thermometer is released by turning the terminal head. The insert is
removed from the protection tube and directly immersed into the calibration bath (see graphic,
right part). Make sure that the cable is long enough to be able to reach the mobile calibration bath
with the cable connected. If this is not possible for the calibration, it is advisable to use a
connector. →  28
Advantages of iTHERM QuickNeck:
• Considerable time savings when recalibrating the device (up to 20 minutes per measuring point)
• Wiring mistakes avoided when re-installing
• Minimum plant downtime, thereby saving costs

iTHERM TM412
Endress+Hauser 15
The minimum immersion length is the length of the insert that is fully immersed in the
calibration bath. For a valid recalibration, the value selected for the length IL* must be at least
the value of the previously defined minimum insertion lengths (IL) of the specific types of
insert. For more detailed values, see the previous tables, values without head transmitter.
If the calibration unit used does not allow the insert to be fully immersed as far as the bottom
edge of the top part of the iTHERM QuickNeck, it might be necessary to add an additional
length (ΔL) to IL*. →  13
Formulas for calculating the IL* when recalibrating onsite with iTHERM QuickNeck
Thermowell version Formula
Protection tube diameter 6.35 mm (¹⁄₄ in)
IL* = U + T + 19.05 mm (0.75 in)Protection tube diameter 9.53 mm (³⁄₈ in)
Protection tube diameter 12.7 mm (¹⁄₂ in)
Insulation resistance Insulation resistance ≥ 100 MΩ at ambient temperature.
Insulation resistance between the terminals and the outer jacket is measured with a minimum
voltage of 100 V DC.
Installation
Orientation No restrictions. However, self-draining in the process must be guaranteed. If there is an opening to
detect leaks at the process connection, this opening must be at the lowest possible point.
Installation instructions The immersion length of the thermometer can influence the accuracy. If the immersion length is too
small then errors in the measurement are caused by heat conduction via the process connection and
the container wall. If installing into a pipe then the immersion length should ideally be half of the
pipe diameter.
• Installation possibilities: Pipes, tanks or other plant components
• To minimize the error caused by heat conduction, a minimum immersion length is recommended
depending on the type of sensor used and the design of the insert. This immersion depth
corresponds to the minimum insertion length for the calibration. →  13
• ATEX certification: Observe the installation instructions in the Ex documentation! →  39

iTHERM TM412
16 Endress+Hauser
U
≥3°
≥3°
1
2
34
A0008946
 3 Installation examples
1, 2 Perpendicular to flow direction, installed at a minimum angle of 3° to ensure self-draining
3 On elbows
4 Inclined installation in pipes with a small nominal diameter
U Immersion length
In the case of pipes with a small nominal diameter, it is advisable for the tip of the thermometer
to project well into the process so that it extends past the pipe axis. Installation at an angle (4)
could be another solution. When determining the immersion length or installation depth all the
parameters of the thermometer and of the medium to be measured must be taken into account
(e.g. flow velocity, process pressure).
The use of iTHERM QuickSens inserts is recommended for immersion lengths U <
70 mm (2.75 in).
1 2
A0008947
 4 Process connections for thermometer installation in pipes with small nominal diameters
1Varivent® process connection type N for DN40
2 Tee or elbow thermowell (illustrated) for weld-in as per DIN 11865 / ASME BPE

iTHERM TM412
Endress+Hauser 17
1 2
A0018881
 5 Process connections for thermometer installation in pipes with small nominal diameters
1Varivent® - process connection D = 50 mm for DN25 pipes
2 Clamp or micro-clamp
1 2 3
Sensor Variventwith
connection
Shaped
gasket
Companion
connection O-ring
Companion
connection
Gasket
(O-ring)
Welding boss
Leak detection hole
Vessel wall
A0033600-EN
 6 Detailed installation instructions for hygiene-compliant installation
1Varivent® process connection for VARINLINE® housing
2 Clamp according to ISO 2852
3 Liquiphant-M G1" process connection, horizontal installation
The counterpieces for the process connections and the seals or sealing rings are not included in
the scope of supply for the thermometer. Liquiphant M weld-in adapters with associated seal
kits are available as accessories. →  35
Procedure in case of seal failure indicated by leak detection port:
• Disassembling of the thermometer, validated cleaning procedure of thread and sealing ring
groove
• Replacement of the seal or sealing ring
• CIP after re-assembly
In the case of weld-in connections, exercise the necessary degree of care when performing the
welding work on the process side:
• Suitable welding material
• Flush-welded or with welding radius > 3.2 mm (0.13 in)
• No recesses, folds or gaps
• Honed and polished surface, Ra ≤ 0.76 µm (30 µin)
As a general rule, the thermometers should be installed in such a way that does not impact
their ability to be cleaned (the requirements of the 3-A Sanitary Standard must be observed).
The Varivent® and Liquiphant-M weld-in adapter enable flush-mounted installation.

iTHERM TM412
18 Endress+Hauser
Environment
Ambient temperature range Terminal head Temperature in °C (°F)
Without mounted head transmitter Depends on the terminal head used and the cable gland or fieldbus
connector, see 'Terminal heads' section →  24
With mounted head transmitter –40 to 85 °C (–40 to 185 °F)
With mounted head transmitter and
display
–20 to 70 °C (–4 to 158 °F)
Extension neck Temperature in °C (°F)
iTHERM QuickNeck –50 to +140 °C (–58 to +284 °F)
Storage temperature For information, see the ambient temperature.
Humidity Depends on the transmitter used. If Endress+Hauser iTEMP head transmitters are used:
• Condensation permitted as per IEC 60 068-2-33
• Maximum relative humidity: 95% as per IEC 60068-2-30
Climate class As per EN 60654-1, Class C
Degree of protection Max. IP69K, depending on the design (terminal head, connector, etc.)
Shock and vibration
resistance
The Endress+Hauser inserts meet the requirements of IEC 60751 which specify shock and vibration
resistance of 3g in the range from 10 to 500 Hz. The vibration resistance at the measuring point
depends on the sensor type and design, see the following table:
Version Vibration resistance for the sensor tip
Pt100 (WW or TF) 30 m/s² (3g) 1)
iTHERM StrongSens Pt100 (TF)
iTHERM QuickSens Pt100 (TF), version: ⌀6 mm (0.24 in)
> 600 m/s² (60g)
1) Vibration resistance also applies for the quick-fastening iTHERM QuickNeck.
Electromagnetic
compatibility (EMC)
Depends on the head transmitter used. For details see the Technical Information. →  39
Process
Process temperature range Depends on the type of sensor used, maximum –200 to +600 °C (–328 to +1 112 °F).
Thermal shock Thermal shock resistance in CIP/SIP process with a temperature increase from
+5 to +130 °C (+41 to +266 °F) within 2 seconds.
Process pressure range The maximum possible process pressure depends on various influencing factors, such as the design,
process connection and process temperature. For information on the maximum possible process
pressures for the individual process connections, see the 'Process connection' section. →  29
It is possible to check the mechanical loading capacity as a function of the installation and
process conditions online in the Thermowell (TW) Sizing Module for protection tubes in the
Endress+Hauser Applicator software. See 'Accessories' section. →  38

iTHERM TM412
Endress+Hauser 19
Example of the permitted flow velocity depending on the immersion length and process
medium
The highest flow velocity tolerated by the thermometer diminishes with increasing insert immersion
length exposed to the stream of the fluid. In addition it is dependent on the diameter of the
thermometer tip, on the kind of measuring medium, on the process temperature and on the process
pressure. The following figures exemplify the maximum permitted flow velocities in water and
superheated steam at a process pressure of 40 bar (580 PSI).
L (mm)
A
0
10
20
30
40
50
60
70
80
90
100 200 300 400 500
v (m/s)
B
04 8 12 16 20
L (in)
0
30
65
100
130
160
200
230
260
290
v (ft/s)
A0008967
 7 Permitted flow velocities, protection tube diameter 9.53 mm (3/8 in)
A Medium water at T = 50 °C (122 °F)
B Medium superheated steam at T = 400 °C (752 °F)
L Immersion length exposed to flow
v Flow velocity
Medium - state of
aggregation
Gaseous or liquid (also with high viscosity, e.g. yogurt).

iTHERM TM412
20 Endress+Hauser
Mechanical construction
Design, dimensions All dimensions in mm (in). The design of the thermometer depends on the protection tube version
used:
• Thermometer without protection tube - for installation in an existing protection tube
• Diameter 6.35 mm (¹⁄₄ in)
• Diameter 9.53 mm (³⁄₈ in)
• Diameter 12.7 mm (¹⁄₂ in)
Various dimensions, such as the immersion length U for example, are variable values and are
therefore indicated as items in the following dimensional drawings.
Variable dimensions:
Item Description
E Extension neck length, variable depending on the configuration or predefined for the version with
iTHERM QuickNeck
IL Insert length
L Protection tube length (U+T)
B Protection tube base thickness: predefined, depends on protection tube version (see also the
individual table data)
T Length of protection tube shaft: variable or predefined, depends on protection tube version (see
also the individual table data)
U Immersion length: variable, depending on the configuration
ØID Insert diameter 6 mm (0.24 in), 3 mm (0.12 in) or 6.35 mm (¹⁄₄ in)
Without protection tube
For installation in an existing protection tube (all dimensions in inch)
134 5 2
IL
ILa
IL
IL
ILa
ILa
ILa
ILa
IL
IL
E=1
E=2.5
E=1.5
E=3.5
E=
0.75
0.32
0.32
0.32
A0034489
1 Thermometer with extension hex nipple, for connection thread ½" NPT
2 Thermometer with extension nipple union nipple (NUN), for connection thread ½" NPT
3 Thermometer with quick-fastening iTHERM QuickNeck, upper part
4 Thermometer with quick-fastening iTHERM QuickNeck complete, for connection thread ½" NPT
5 Thermometer with 1¼" x 18 UNEF thread
IL Insert length
ILa Insert length (without nipple)
E Length of the extension neck available at point of installation (provided one is available)