Technical Information
Omnigrad S TMT162C
Thermocouple assembly
®
with HART
or PROFIBUS
-, FOUNDATION Fieldbus™-
®
PA field transmitter
Application
• Chemical/pharmaceutical industry
• Petrochemical industry
• Energy industry
• Paper industry
• General industrial applications
The TMT162C thermocouple thermometer comprises a
measuring insert with a type J or K thermocouple and an
electronic field transmitter with HART
Fieldbus™ or PROFIBUS
Features and benefits
• Dual compartment housing
• Backlit display with large measured value, bargraph
and fault condition indication
• Galvanic isolation 2 kV (sensor input to the output)
• Wide range of threaded thermowell connections available as standard, additional connections available on
request
• Replaceable measuring insert comprising a mineralinsulated tube (SS 316L/1.4404)
• Thermocouple (type J or K) with accuracy class 1 or 2
(IEC 60584)
• Aluminum or stainless steel housing,
degree of protection IP67, NEMA 4x
• Approvals for hazardous areas:
Flameproof enclosure (Ex d)
Intrinsic safety (Ex ia)
Non-sparking (Ex nA)
• Optional: 2 thermocouples can be connected, e.g. for
redundant applications or differential measurement
• Optional factory calibration
®
PA protocol.
®
, FOUNDATION
TI267t/02/en
71093904
TMT162C
Function and system design
Measuring principle In the thermocouple, two electrically conductive conductors made of different metals are connected at the ends
(thermocouple), thereby producing a thermoelectric circuit. The weld point forms the "measuring point" and
the other end with the free wires forms the "cold junction". When the "measuring point" of this thermoelectric
circuit is heated, a current flows through the circuit and a weak electrical voltage (known as the thermoelectric
voltage) is generated.
If the measuring point and the reference junction have the same temperature, a thermoelectric voltage is not
generated. The strength of the thermoelectric voltage (also know as the electromagnetic force), primarily
depends on the materials of the thermocouple and the size of the temperature differential. The sensors (thermocouple) meet the requirements of IEC 60584 and ANSI MC96.1.
Measuring system
TMT162C
TMT162R_G_dd_07_xx_04
The TMT162C thermocouple thermometer comprises a measuring insert with a thermocouple (TC) and the
iTEMP® TMT162 field transmitter which can be configured using the HART®, FOUNDATION Fieldbus™ or
PROFIBUS® PA protocol. A thermowell can be ordered separately.
The sensor element is integrated in the tip of the measuring insert and complies with IEC 60584 and ANSI
MC96.1. It withstands loads that typically occur in the most common industrial processes. The sensor element
consists of 2 metal alloy wires, type J (iron/copper nickel) or type K (nickel chromium/nickel). The measuring
range and tolerance errors differ depending on the thermocouple. The measuring insert is a replaceable unit
and is installed in a thermowell. A spring system presses it against the base of the thermowell to improve the
transmission of heat.
The transmitter housing is made of die-cast aluminum or stainless steel. It can be purchased with or without
an LC display. The minimum degree of protection, IP65, is achieved by sealing glands at the cable entry and
the thermometer connection. Depending on the customer's requirements, customers can choose from thermowells constructed from welded tubes and thermowells made of drilled barstock material. The thermowells
are available in various shapes and sizes and with a wide range of process connections (thread, flange or weldon connections, see page 12).
Measurement range
Input Designation Measuring range limits Min. span
Thermocouples (TC)
to IEC 60584 part 1
Type J (Fe-CuNi)
Type K (NiCr-Ni)
• Internal cold junction (Pt100)
• Accuracy of cold junction: ± 1 K
• Max. sensor resistance 10 kΩ (if sensor resistance is greater than 10 kΩ, error message as per NAMUR NE 89)
-210 to +1200 °C (-346 to 2192 °F)
-270 to +1372 °C (-454 to 2501 °F)
50 K
50 K
Performance characteristics
Operating conditions Ambient temperature limits
• Without display: -40 to +85 °C (-40 to 185 °F)
• With display: -40 to +80 °C (-40 to 176 °F)
For use in Ex area, see Ex certificate.
2 Endress+Hauser
Note!
!
At temperatures < -20 °C (-4 °F), the display may react slowly. Readability of the display cannot be guaranteed
at temperatures < -30 °C (-22 °F).
Storage temperature • Without display: -40 to +100 °C (-40 to 212 °F)
• With display: -40 to +80 °C (-40 to 176 °F)
Process pressure/flow velocity
The load limits of the thermometer depend on the thermowell used and are listed in the technical information
specific to the individual thermowells (see page 12). Factors that affect the load limits include the process pressure, flow velocity, density of the medium, temperature, immersion depth, length of the thermowell in the
flowing medium etc. In critical situations, a load capacity calculation for the thermowell can be ordered from
Endress+Hauser.
Shock and vibration resistance
3 g (max. value)/ 10 to 500 Hz as per IEC 60 068-2-6
Accuracy Thermocouple corresponding to IEC 60584
Type Standard tolerance (IEC 60584) Reduced tolerance (IEC 60584)
Class Deviation Class Deviation
J (Fe-CuNi) 2 ±2.5 °C (-40...333 °C)
±0.0075 |t|
K (NiCr-Ni) 2 ±2.5°C (-40...333°C)
±0.0075 |t| (333...1200 °C)
1. |t| = absolute value °C
1
(333...750 °C)
TMT162C
1 ±1.5 °C (-40...375 °C)
±0.004 |t| (375...750 °C)
1 ±1.5 °C (-40...375 °C)
±0.004 |t| (375...1000 °C)
Note!
!
For measurement errors in °F, calculate using equations above in °C, then multiply the outcome by 1.8.
Response time Tests in water at 0.4 m/s (1.3 ft/s), according to IEC 60584; 10 K temperature step changes; response time
for the assembly without thermowell and transmitter:
•t50: 2.5 s
•t90: 7 s
Insulation resistance Insulation resistance ≥100 MΩ at ambient temperature.
Insulation resistance between each terminal and the sheath is tested with a voltage of 500 V DC.
Transmitter specifications
TMT162 FF/PA TMT162 HART
Digital D/A
Accuracy 0.25 °C (0.45 °F)
Galvanic isolation
(input/output)
1. % relates to the set span. Total accuracy = digital + D/A, for 4 to 20 mA output
typ. 0.25 °C (0.45 °F) 0.02%
U = 2 kV AC
Accuracy
®
1
Self heating Negligibly small
Endress+Hauser 3
TMT162C
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Material
Housing Nameplate Neck, insert
Die-cast aluminum housing AlSi10Mg
with powder coating on polyester basis
Stainless steel 1.4435 (AISI 316L) 1.4301 (AISI 304)
Installation conditions
Orientation No restrictions
Aluminum AlMgl, anodized in black Stainless steel 1.4404 (AISI 316L)
Electromagnetic compatibility (EMC)
Installation instructions
CE Electromagnetic Compatibility Compliance
EMC meets all relevant requirements listed under EN 61326 Series and NAMUR NE21. Details as per declaration of conformity.
This recommendation is a uniform and practical way of determining whether the devices used in laboratories
and process control are immune to interference with an objective to increase its functional safety.
ESD (Electrostatic discharge) IEC 61000-4-2 6 kV cont., 8 kV air
Electromagnetic fields IEC 61000-4-3 0.08 to 2 GHz
(0.08 to 4 GHz for FF)
0.08 to 2 GHz for HART
2 to 2.7 GHz
Burst (fast transient) IEC 61000-4-4 1 kV (2 kV for HART)
surge IEC 61000-4-5 1 kV asym. (0.5 kV sym. for HART)
Conducted RF IEC 61000-4-6 0.01 to 80 MHz 10 V
10 V/m
10 V/m
30 V/m
1V/m
Installation examples
T09-TMT162RC-11-xx-xx-xx-003
A: In pipes with a small cross section the sensor tip should reach or extend slightly past the center line of the pipe (= L).
B, D: Tilted installation
C: Flanged installation
4 Endress+Hauser