Endress+Hauser TM372 Specifications
TI01292T/09/EN/04.18
71413048
2018-08-01
Products Solutions Services
Technical Information
iTHERM TrustSens TM371,
TM372
Compact thermometer for hygienic and aseptic
applications
HART®-Protocol
Outstanding sensor technology with selfcalibrating function
100% Compliance - 0% Effort
Applications
• Specially designed for use in hygienic and aseptic applications in the Food &
Beverages and Life Sciences industries
• Measuring range: –40 to +160 °C (–40 to +320 °F)
• Pressure range up to 50 bar (725 psi)
• Protection class: IP67/68 or IP69K
• Communication: Analog output 4 to 20 mA, HART® protocol
Your benefits
• Risk and cost reduction thanks to self-calibration and 'Heartbeat technology'
• Fully automated, traceable, inline self-calibration
• Automatized documentation, memory for 350 self-calibration points
• Printable calibration certificate - audit proof
• Elimination of nonconformity or undetected failures
• International certifications, regulations (EC/EU), approvals and declarations of
conformity:
– EHEDG, ASME BPE, FDA, 3-A, EC 1935/2004, EC 2023/2006, EU 10/2011
– CE/EAC, CRN, CSA General Purpose
• Highest measurement accuracy through sensor-transmitter matching
• Heartbeat Technology
Table of contents
iTHERM TrustSens TM371, TM372
Function and system design ................... 3
iTHERM TrustSens ............................ 3
Measuring principle ............................ 3
Measuring system ............................. 3
Equipment architecture ......................... 4
Input ..................................... 5
Measuring range .............................. 5
Output ................................... 5
Output signal ................................ 5
Failure information ............................ 5
Load ...................................... 5
Linearization/transmission behavior ................. 5
Filter ...................................... 5
Protocol-specific data ........................... 5
Wiring ................................... 6
Supply voltage ............................... 6
Current consumption ........................... 6
Electrical connection ........................... 6
Device plug connection .......................... 7
Overvoltage protection .......................... 7
Performance characteristics ................... 7
Reference operating conditions .................... 7
Internal calibration point ........................ 7
Measurement uncertainty ........................ 8
Long-term drift ............................... 8
Influence of ambient temperature .................. 8
Influence of supply voltage ....................... 8
Response time ............................... 9
Calibration .................................. 9
Insulation resistance .......................... 11
Installation ............................... 11
Orientation ................................ 11
Installation instructions ........................ 11
Material .................................. 24
Surface roughness ............................ 24
Protection tube .............................. 25
Operability ............................... 33
Operating concept ............................ 33
Local operation .............................. 33
Remote operation ............................ 33
Certificates and approvals ................... 34
CE mark ................................... 34
EAC mark ................................. 34
cCSAus ................................... 34
MTBF .................................... 34
Hygiene standard ............................ 34
Other standards and guidelines ................... 34
Parts in contact with the medium .................. 34
CRN approval ............................... 34
Surface purity ............................... 35
Material resistance ........................... 35
Material certification .......................... 35
Calibration ................................. 35
Protection tube testing and load capacity calculation ..... 35
Ordering information ....................... 35
Application packages ....................... 35
Heartbeat diagnostics .......................... 35
Heartbeat verification ......................... 36
Heartbeat Monitoring ......................... 36
Accessories ............................... 37
Device-specific accessories ...................... 37
Communication-specific accessories ................ 40
Service-specific accessories ...................... 41
System components ........................... 42
Documentation ............................ 42
Environment .............................. 13
Ambient temperature range ..................... 13
Storage temperature range ...................... 13
Climate class ............................... 13
Degree of protection .......................... 14
Shock and vibration resistance .................... 14
Electromagnetic compatibility (EMC) ............... 14
Process .................................. 14
Process temperature range ...................... 14
Thermal shock .............................. 14
Process pressure range ......................... 14
Medium - state of aggregation .................... 15
Mechanical construction .................... 15
Design, dimensions ........................... 15
Weight ................................... 24
2 Endress+Hauser
iTHERM TrustSens TM371, TM372
mm
inch
Function and system design
The iTHERM TrustSens thermometer incorporates a groundbreaking innovation – its self-calibration
functionality. Under normal operation a standard Pt100 sensor element is being used. By means of a
built-in, highly accurate reference sensor, the Pt100 measurement is automatically calibrated at a
certain process temperature. This eliminates the need to remove the thermometer for calibration
purposes. For more details please see chapter calibration.
iTHERM TrustSens
This thermometer is part of the compact thermometer line for hygienic and aseptic applications.
Differentiating factors when selecting a suitable thermometer
TM371 TM372
Metric version, all dimensions given in mm Imperial version, all dimensions given in inches
↓ ↓
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.
Thin film platinum resistance thermometers (TF): A ultrapure platinum layer, about 1 µm thick,
is applied by vapor deposition 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 are their small sizes and good vibration
resistance.
A0031087
A0031088
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
• Overvoltage protection
For more information, see the brochure 'System Products and Data Managers - Solutions for the
loop' (FA00016K/EN)
Endress+Hauser 3
iTHERM TrustSens TM371, TM372
2 3
1
4 5
U
1
2
3
4
5
6
A0031089
1 Example of application, measuring point layout with additional Endress+Hauser components
1
Installed iTHERM compact thermometer with HART® communication protocol
2 RIA15 loop powered process display - It is integrated in the current loop and displays the measuring signal or
HART® process variables in digital form. The process display unit does not require an external power supply.
It is powered directly from the current loop. More information on this can be found in the Technical
Information, see "Documentation", → 42.
3 Active barrier RN221N - The RN221N (24 V DC, 30 mA) active barrier has a galvanically isolated output for
supplying voltage to loop-powered transmitters. The universal power supply works with an input supply
voltage of 20 to 250 V DC/AC, 50/60 Hz, which means that it can be used in all international power grids.
More information on this can be found in the Technical Information, see "Documentation", → 42.
4 Commubox FXA195 for intrinsically safe HART® communication with FieldCare via the USB interface.
5 FieldCare is a FDT-based plant asset management tool from Endress+Hauser, more details see section
'accessories'. The acquired self-calibration data is stored in the device (1) and can be read using FieldCare.
This also enables an auditable calibration certificate to be created and printed.
Equipment architecture
Design Options
1: Wiring,
electrical
connection,
output signal
2: Transmitter
housing
3: Extension neck • Welded-in-place or removable
4: Process
connection
→ 25
5: Protection tube • Versions with and without protection tube (insert in direct contact with
6: Insert Sensor model: thin-film Pt100 sensor (TF) with iTHERM TrustSens technology.
A0031106
Your benefits:
• Optimum protection even with high-pressure cleaning: As standard
IP67/68, optional IP69K protection
• M12, 4pin connector: cost and time savings as well as incorrect wiring
avoided
• Compact built-in transmitter (4 to 20 mA, HART®)
• Optional with iTHERM QuickNeck bayonet joint
Your benefits:
• iTHERM QuickNeck: tool-free removal of the compact thermometer
• IP69K protection: safety under extreme process conditions
More than 50 different versions.
process).
• Various diameters
• Various tip shapes (straight or reduced)
Your benefits:
• Risk and cost reduction thanks to Heartbeat technology
• Fully automated, traceable, inline self-calibration
• Automatized documentation, memory for the last 350 calibration
points
• Printable calibration certificate - audit proof
• No risk of unconformity or undetected failures
• International certifications and approvals
4 Endress+Hauser
iTHERM TrustSens TM371, TM372
Ub
30 V
780
530
250
12 V
0
24.2 V
17.75 V
Supply voltage (V DC)
Load (Ω)
Input
Measuring range
Output signal
Failure information
Load
Pt100 thin-film (TF) –40 to +160 °C (–40 to +320 °F)
Output
Analog output 4 to 20 mA
Digital output HART® protocol (revision 7)
Failure information as per NAMUR NE43:
Failure information is created if the measuring information is missing or not valid. A complete list of
all the errors occurring in the measuring system is created.
Underranging Linear decrease from 4.0 to 3.8 mA
Overranging Linear increase from 20.0 to 20.5 mA
Failure, e.g. sensor breakage, sensor shortcircuit
Maximum possible HART® communication resistance
≤ 3.6 mA ("low") or ≥ 21 mA ("high"), can be selected
The "high" alarm setting can be set between 21.5 mA and
23 mA, thus providing the flexibility needed to meet the
requirements of various control systems.
Linearization/transmission behavior
Filter
Protocol-specific data
R
b max.
output)
= (U
- 12 V) / 0.023 A (current
b max.
Temperature-linear
1st order digital filter: 0 to 120 s, factory setting: 0 s (PV)
HART
Manufacturer ID 17 (0x11)
Device type ID 0x11CF
HART revision 7
Device description files (DTM, DD) Information and files at:
• www.endress.com/downloads
• www.fieldcommgroup.org
HART load Min. 250 Ω
A0032387-EN
Endress+Hauser 5
iTHERM TrustSens TM371, TM372
HART device variables Measured value for PV (primary value)
Temperature
Measured values for SV, TV, QV (secondary, tertiary and quaternary
variable)
• SV: Device temperature
• TV: Calibration counter
• QV: Calibration deviation
Supported functions • Additional transmitter status
• NE107 diagnostics
Startup behavior / wireless HART data
Supply voltage
Current consumption
Minimum start-up voltage 12 V
Start-up current 3.58 mA
Start-up time < 7 s, until the first valid measured value signal is present at the current
Minimum operating voltage 12 V
Multidrop current 4 mA
Lead time 0 s
DC
output
DC
Wiring
According to the 3-A Standard electrical connecting cables must be smooth, corrosion-resistant
and easy to clean.
Ub = 12 to 30 V
The device may only be powered by a power supply unit with a limited energy electric circuit in
accordance with UL/EN/IEC 61010-1 chapter 9.4 or Class 2 according to UL 1310, "SELV or
Class 2 cir-cuit".
• I = 3.58 to 23 mA
• Minimum current consumption: I = 3.58 mA, multi-drop mode I =4 mA
• Maximum current consumption: I ≤ 23 mA
DC
Electrical connection
To prevent any kind of damage from the device electronics, leave the pins 2 and 4 unconnected.
They are reserved for the connection of the configuration cable.
Do not tighten the M12 plug too much, in order to prevent damage to the device. Maximum
torque: 0.4 Nm (M12 knurl)
6 Endress+Hauser
iTHERM TrustSens TM371, TM372
M12x1
1
12...30 VDC
(4...20 mA)
3
0 V
(4...20 mA)
4
2
A
B
1 (BN) +
2 (WH)
3 (BU) -
4 (BK)
1
43
2
2 Pin assignment of the device connecting socket
1 Power supply 12 to 30 VDC; current output 4 to 20 mA
2 Reserved for configuration cable
3 Power supply 0 VDC; current output 4 to 20 mA
4 Reserved for configuration cable
Device plug connection
A0030963
Overvoltage protection
Reference operating conditions
Internal calibration point
A0030965
3 Pin assignment of the plug connector
1 Power supply +, wire color brown = BN
2 Connection of PC configuration cable, wire color white = WH
3 Power supply -, wire color blue = BU
4 Connection of PC configuration cable, wire color black = BK
Appropriate cord sets with straight or angle plugs are available as accessory.
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.
For more information see the Technical Information 'HAW562 Surge arrester' TI01012K
Performance characteristics
• Ambient temperature: 25 °C ± 5 °C (77 °F ± 9 °F)
• Supply voltage: 24 V
• 118 °C (244.4 °F) +1.2 K / –1.7 K
• Lowest possible calibration point = 116.3 °C (241.3 °F)
• Highest possible calibration point = 119.2 °C (246.6 °F)
The individual calibration point of each TrustSens device is indicated in the ex-works calibration
certificate enclosed with the shipment.
DC
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iTHERM TrustSens TM371, TM372
Measurement uncertainty
Long-term drift
The given uncertainty values include non-linearity and non-repeatability and correspond to 2σ (95%
confidence level according to the Gaussian distribution curve).
Uncertainty of self-calibration of digital output (HART® value) at the
calibration point.
Uncertainty of the
temperature sensor inclusive
digital output (HART® value)
at reference conditions in
delivery state.
Each iTHERM TrustSens
is calibrated and
matched by default
before shipment to
guarantee the given
accuracy.
Uncertainty of D/A converter (analog output current) 0.03 % of the measurement
Pt100 sensing element < 1000 ppm/1000 h
A/D converter (digital output - HART®) < 500 ppm/1000 h
D/A converter (analog output - current) < 100 ppm/1000 h
1) This would be detected by the self-calibration
Process temperature:
+20 to +135 °C (+68 to +275 °F)
+135 to +160 °C (+275 to +320 °F)
0 to +20 °C (+32 to +68 °F)
–20 to 0 °C (–4 to +32 °F)
–40 to –20 °C (–40 to –4 °F)
< 0.35 °C (0.63 °F)
< 0.22 °C (0.4 °F)
< 0.38 °C (0.68 °F)
< 0.27 °C (0.49 °F)
< 0.46 °C (0.83 °F)
< 0.8 °C (1.44 °F)
range
1)
1)
Influence of ambient temperature
Influence of supply voltage
Long-term drift decreases at an exponential rate over time. So it may not be extrapolated in a
linear way for time spans longer than the above given values.
A/D converter (digital output - HART®) at typical
operating conditions
A/D converter (digital output - HART®) at maximum
operating conditions
D/A converter (analog output - current) ≤ 30 ppm/°C (2σ), related to the deviation from the
< 0.05 K (0.09 °F)
< 0.15 K (0.27 °F)
reference temperature
Typical operating conditions
• Ambient temperature: 0 to +40 °C (+32 to +104 °F)
• Process temperature: 0 to +140 °C (+32 to +284 °F)
• Power supply: 18 to 24 V
DC
According to IEC 61298-2:
A/D converter (digital output - HART®) at typical
operating conditions
D/A converter (analog output - current) < 10 ppm/V
1) Related to the deviation from the reference supply voltage
< 15 ppm/V
1)
1)
Sample calculation with Pt100, measuring range +20 to +135 °C (+68 to +275 °F), ambient
temperature +25 °C (+77 °F), supply voltage 24 V:
Measured error digital 0.220 °C (0.396 °F)
Measured error D/A = 0.03 % x 150 °C (302 °F) 0.045 °C (0.081 °F)
Measured error digital value (HART): 0.220 °C (0.396 °F)
Measured error analog value (current output): √(Measured error digital² +
Measured error D/A²)
0.225 °C (0.405 °F)
8 Endress+Hauser
iTHERM TrustSens TM371, TM372
Sample calculation with Pt100, measuring range +20 to +135 °C (+68 to +275 °F), ambient
temperature +35 °C (+95 °F), supply voltage 30 V:
Measured error digital 0.220 °C (0.396 °F)
Measured error D/A = 0.03 % x 150 °C (302 °F) 0.045 °C (0.081 °F)
Influence of ambient temperature (digital) 0.050 °C (0.090 °F)
Influence of ambient temperature (D/A) = (35 °C - 25 °C) x (30 ppm/°C x 150 °C) 0.045 °C (0.081 °F)
Influence of supply voltage (digital) = (30 V - 24 V) x 15 ppm/V x 150 °C 0.014 °C (0.025 °F)
Influence of supply voltage (D/A) = (30 V - 24 V) x 10 ppm/V x 150 °C 0.009 °C (0.016 °F)
Response time
Measured error digital value (HART):
√(Measured error digital² + Influence of ambient temperature (digital)² + Influence
of supply voltage (digital)²
Measured error analog value (current output):
√(Measured error digital² + Measured error D/A² + Influence of ambient
temperature (digital)² + Influence of ambient temperature (D/A)² + Influence of
supply voltage (digital)² + Influence of supply voltage (D/A)²
Tests in water at 0.4 m/s (1.3 ft/s), according to IEC 60751; 10 K temperature step change. t63 / t
0.226 °C (0.407 °F)
0.235 °C (0.423 °F)
are defined as the time that passes until the instrument output reaches 63% / 90% of the new value.
Response time with heat transfer paste
Protection tube Shape of tip Insert t
6 mm (0.24 in) Reduced 4.3 mm (0.17 in) x 20 mm (0.79 in) 3 mm (0.12 in) 2.9 s 5.4 s
9 mm (0.35 in)
12.7 mm (¹⁄₂ in)
1) Between the insert and the protection tube.
Reduced 5.3 mm (0.21 in) x 20 mm (0.79 in) 3 mm (0.12 in) 2.9 s 5.4 s
Reduced 5.3 mm (0.21 in) x 20 mm (0.79 in) 3 mm (0.12 in) 2.9 s 5.4 s
Reduced 8 mm (0.31 in) x 32 mm (1.26 in) 6 mm (0.24 in) 10.9 s 24.2 s
1)
63
Straight 6 mm (0.24 in) 9.1 s 17.9 s
Straight 6 mm (0.24 in) 10.9 s 24.2 s
90
t
90
Response time without heat transfer paste
Protection tube Shape of tip Insert t
Without
protection tube
6 mm (0.24 in) Reduced 4.3 mm (0.17 in) x 20 mm (0.79 in) 3 mm (0.12 in) 7.4 s 17.3 s
9 mm (0.35 in)
12.7 mm (¹⁄₂ in)
Calibration
Reduced 5.3 mm (0.21 in) x 20 mm (0.79 in) 3 mm (0.12 in) 7.4 s 17.3 s
Reduced 5.3 mm (0.21 in) x 20 mm (0.79 in) 3 mm (0.12 in) 7.4 s 17.3 s
Reduced 8 mm (0.31 in) x 32 mm (1.26 in) 6 mm (0.24 in) 30.7 s 74.5 s
Calibration of thermometers
- 6 mm (0.24 in) 5.3 s 10.4 s
Straight 6 mm (0.24 in) 24.4 s 54.1 s
Straight 6 mm (0.24 in) 30.7 s 74.5 s
63
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,
• Comparison calibration 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 or
special calibration furnaces with homogeneous distribution of temperature are typically used for
t
90
Endress+Hauser 9
iTHERM TrustSens TM371, TM372
thermometer calibrations. The DUT and the reference thermometer are placed closely together into
the bath or furnace at a sufficient depth.
The measurement uncertainty can increase due to heat conduction errors and short immersion
lengths. The existing measurement uncertainty is listed on the individual calibration certificate.
For accredited calibrations according to IEC/ISO 17025, the measurement uncertainty must not be
twice as high as the accredited measurement uncertainty of the laboratory. If the limit value is
exceeded, only a factory calibration can be carried out.
For manual calibration in calibration baths the maximum immersion length of the device
ranges from the sensor tip to the lower part of the electronic housing. Do not immerse the
housing into the calibration bath!
A0032391
Self-calibration
The self-calibration procedure uses the Curie temperature (Tc) of a reference material as a built-in
temperature reference. A self-calibration is performed automatically, when the process temperature
(Tp) falls below the nominal Curie Temperature (Tc) of the device. At the Curie temperature, a phase
change of the reference material takes place, which is associated with a change in its electrical
properties. The electronics automatically detects this change and simultaneously calculates the
deviation of the measured Pt100-temperature to the known, physically fixed Curie temperature. The
TrustSens thermometer is calibrated. A green flashing LED light indicates the ongoing selfcalibration process. Subsequently the thermometer electronics stores the results of this calibration.
The calibration data can be read via an asset management software like FieldCare or DeviceCare. A
self-calibration certificate can be created automatically. This inline self calibration allows a
continuous and repeated monitoring of changes to the Pt100 sensor and to the electronics’
characteristics. As the inline calibration is being performed under real ambient or process conditions
(e.g. heating of electronics), the result is closer to reality than a sensor calibration under laboratory
conditions.
Process criteria for self-calibration
To ensure a valid self-calibration within the given measurement accuracy, the process temperature
characteristics needs to fulfil the criteria, which are checked by the device automatically. Based on
this, the device is ready to perform a self-calibration under the following conditions:
– Process temperature > calibration temperature +3 °C (5.4 °F) for 25 s before cooling down; t1 - t2.
– Cooling rate: 0.5 to 16.5 K/min (0.9 to 29.7 °F/min), while the process temperature crosses the
Curie temperature; t2 - t3 + 10 s.
The process temperature ideally declines continuously below 116 °C (240.8 °F). A valid selfcalibration process is done when the green LED flashes with a frequency 5 Hz for 5 s.
10 Endress+Hauser
iTHERM TrustSens TM371, TM372
T / °C (°F)
t
123 °C
(253.4 °F)
> 25 s
< 116 °C (240.8 °F)
-16.5 K/min
(-29.7 °F/min)
t1
t2
1
t3
t3
116 °C
(240.8 °F)
-0.5 K/min
(-0.9 °F/min)
2
4 Needed process temperature profile for self-calibration
1 Process temperature 123 °C (253.4 °F)
2 Allowed self-calibration range
A0032839
Insulation resistance
Orientation
Installation instructions
Calibration monitoring
Available in conjunction with Advanced Data Manager Memograph M (RSG45). → 42
Application package:
• Up to 20 devices can be monitored via the HART interface
• Self-calibration data displayed on screen or via the Web server
• Generation of a calibration history
• Creation of a calibration protocol as an RTF file directly at the RSG45
• Evaluation, analysis and further processing of the calibration data using "Field Data Manager"
(FDM) analysis software
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
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.
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. 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
Endress+Hauser 11
iTHERM TrustSens TM371, TM372
U
≥ 3°
≥ 3°
1
2
3
4
1
2
5 Installation examples
1, 2 Perpendicular to flow direction, installed at a min. angle of 3° to ensure self-draining
3 On elbows
4 Inclined installation in pipes with a small nominal diameter
U Immersion length
A0031007
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).
6 Process connections for thermometer installation in pipes with small nominal diameters
1
Varivent® process connection type N for DN40
2 Corner-piece or T-piece (illustrated) for weld-in as per DIN 11865 / ASME BPE 2012
A0031022
12 Endress+Hauser
iTHERM TrustSens TM371, TM372
1 2
3
4
R0.4 R0.4
Sensor with
milk pipe
connection
Sensor with Varivent
connection
Shaped
gasket
Companion
connection
O-ring
Groove
slip-on nut
Centering ring
Sealing
Companion
connection
Companion
connection
Gasket
(O-ring)
Welding boss
Leak detection hole
Vessel wall
7 Detailed installation instructions for hygiene-compliant installation
1 Sanitary connection according to DIN 11851, only in connection with EHEDG-certified and self-centering
2
3 Clamp according to ISO 2852
4 Liquiphant-M G1" process connection, horizontal installation
A0011758-EN
sealing ring
Varivent® process connection for VARINLINE® housing
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.
Procedure in case of seal failure indicated by leak detection port:
• Disassembling of the thermometer, validated cleaning procedure of thread and 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 pits, folds, crevices or cracks
• 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 and Ingold (+ weld-in adapter) connections
enable flush-mounted installation.
Environment
Ambient temperature range
Storage temperature range
Climate class
Endress+Hauser 13
Ambient temperature Ta–40 to +60 °C (–40 to +140 °F)
Maximum electronics
temperature T
–40 to +85 °C (–40 to +185 °F)
T = –40 to +85 °C (–40 to +185 °F)
As per IEC 60654-1, Class Dx
iTHERM TrustSens TM371, TM372
Degree of protection
Shock and vibration resistance
Electromagnetic compatibility (EMC)
• IP54 for the version without protection tube provided for installation in an existing protection tube
• IP67/68 for housing with LED status indication
• IP69K for housing without LED status indication and only if appropriate cord-set with M12x1
coupling is connected. → 40
The specified rating IP67/68 or IP69K for the compact thermometer is only assured when an
approved M12 connector with a suitable IP rating is installed according to its manual.
Endress+Hauser temperature sensors meet the requirements of IEC 60751 which specify shock and
vibration resistance of 3g in the range from 10 to 500 Hz. This also applies for the quick-fastening
iTHERM QuickNeck.
EMC to all relevant requirements of the IEC/EN 61326 - series and NAMUR Recommendation EMC
(NE21). For details, refer to the Declaration of Conformity. All tests were passed both with and
without ongoing HART® communication.
All EMC measurements were performed with a turn down (TD) = 5:1. Maximum fluctuations during
EMC- tests: < 1% of measuring span.
Interference immunity to IEC/EN 61326 - series, requirements for industrial areas.
Interference emission to IEC/EN 61326 - series, electrical equipment Class B.
Process
Process temperature range
Thermal shock
Process pressure range
T
P
Reference sensor defective if temperature range of –45 to +200 °C (–49 to +392 °F) is exceeded.
Temperature measurement continues, but selfcalibration is out of function.
Thermal shock resistance in CIP/SIP process with a temperature increase and decrease from
+5 to +130 °C (+41 to +266 °F) within 2 seconds.
The maximum static process pressure is limited by the process connection, see respective section.
→ 25
It is possible to check the mechanical loading capacity as a function of the installation and
process conditions online in the TW Sizing Module for protection tubes in the Endress+Hauser
Applicator software. This is valid for DIN thermowell calculations. See 'Accessories' section.
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 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 process medium, on the process temperature and on the process pressure. The
following figures exemplify the maximum permitted flow velocities in water at a process pressure of
40 bar (580 PSI) and superheated steam at a process pressure of 6 bar (87 PSI).
–40 to +160 °C (–40 to +320 °F)
14 Endress+Hauser
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