Endress+Hauser Thermocouples TH51 Manual

TI111R/24/ae
Technical Information
Thermocouples TH51, TH52 & TH56
General purpose MgO insulated thermocouples with connection
head, extension lead wires or connectors for process and laboratory
applications
Areas of application
Magnesium Oxide insulated thermocouples,
commonly referred to as MgO thermocouples, are
used in many process and laboratory applications.
They have many desirable characteristics making
thermocouples a good choice for general and special
purpose applications.
The sensors can be used on:
• Heat exchangers
• Power & recovery areas
• Furnaces
•Dryers
• Flue gas
• Compressor stations
• Process reactors
• Metallurgical and Glass manufacturing
Head transmitters
Instead of directly wiring your temperature sensors to
your control system, use transmitters to reduce
wiring and maintenance costs while increasing
measurement accuracy.
Your benefits
• One source shopping for temperature measurement
solutions. World class transmitter with integrated sensor
offering.
– Remove and install straight out of the box!
• Improved galvanic isolation on most devices (2 kV)
• Simplified model structure: Competitively priced, offers
great value. Easy to order and reorder. A single model
number includes sensor and transmitter assembly for a
complete point solution.
• All iTEMP®transmitters provide long term
stability ≤0.05 % per year

TH51, TH52, TH56
2Endress+Hauser
Function and system design
Measuring principle The thermocouple sensing element consists of two metal wires that are homogeneous but different from each
other and insulated along their entire length. The two wires are welded together at one end, known as "hot
junction". The other end, where the wires are free, is known as "cold junction" and is connected to an
electromotive force measurement circuit where the force is generated by the different thermoelectric power of
each of the thermocouple wires if there is a temperature difference between the hot junction and the cold
junction (Seebeck effect). The function that links the electromotive force to the temperatures difference is a
curve whose characteristics depend on the materials used in the construction of the thermocouple. The
thermocouples comply with the temperature-electromotive force (EMF) tables of ASTM E-230 and IEC60584
standards.
Measuring system
Example of an application of the temperature assemblies
RIA 261 Field display
The display measures an analog measurement signal and indicates this on the display. The display is connected
in a 4 to 20 mA current loop and also derives its supply from the loop. The volt drop is almost negligible
(< 2.5 V). The dynamic internal resistance (load) makes sure that independently from the loop current, the
maximum volt drop is never exceeded. The analog signal at the input is digitalized, analyzed, and shown in
the rear illuminated display. For details see Technical Information (see "Documentation").
RNS 221
The RNS 221S power supply (24 V DC, 30 mA) has two galvanically isolated outputs for supplying voltage to
loop powered transmitters. The two channel power supply has a wide-range input for main power, 20 to
250 V DC/AC, 50/60 Hz to be used in any electrical circuit. For details see Technical Information (see
"Documentation").
RNS 221 is an UL recognized component to UL-3111-1.
Accessory RMA 421A-VN
NEMA 4x protective housing for field mounting DIN rail instruments, see www.us.endress.com/e-direct.
alpha-Log, RSA10
Universal compact panel mounted color hybrid recorder with 1 to 6 analog inputs, automatic wind up system
for 190 ft. (58 m) roll chart paper and informative dual display concept (analog & digital).
Dimensions: 5.7 x 5.7 x 8.5 inches (144x144x215 mm)
For details see Technical Information (see "Documentation").
Equipment architecture MgO thermocouple assemblies consists of a thermocouple element swaged in hard-packed standard purity
(96%) Magnesium Oxide mineral insulation and encased in a metal sheath. Thermocouple sheaths have been
fully annealed; they can be formed into many configurations, and can be bent into a radius of twice the size of
its outer sheath. The hot junction of the thermocouple types according to ASTM E-230 specification are welded
to form a pure joint to ensure highest accuracy and long term stability.

TH51, TH52, TH56
Endress+Hauser 3
Measurement range Measuring range by type and size
!Note!
These values are valid for single and duplex thermocouples. The temperature limits given are intended only as
a guide to the user and should not be taken as absolute values or as guarantees of satisfactory life or
performance. These types and sizes are sometimes used at temperatures above the given limits, but usually at
the expense of stability or life or both. In other instances, it may be necessary to reduce the above limits in
order to achieve adequate service.
!Note!
Duplex versions (2 elements) of Type N with 1/16", 3/16" and 3/8" sheath diameter are not available.
Thermocouples with 316 SS sheath are rated for a maximum temperature of 1700 °F (927 °C).
Electronics
Family of temperature trans-
mitters
Thermocouple assemblies with iTEMP®transmitters are an installation ready solution to improve the
functionality of temperature measurement by increasing accuracy and reliability when compared to direct
wired sensors. Overall installation costs are lower than with direct wired sensors, since an inexpensive pair of
signal (4 to 20 mA) wires can be run over long distances.
PC programmable device TMT
181
PC programmable devices offer you extreme flexibility and help control costs with the ability to stock one
device and program it for your needs. Regardless of your choice of output, all iTEMP®transmitters can be
configured quickly and easily with a PC. To help you with this task, Endress+Hauser offers free software
ReadWin®2000 which can be downloaded from our website. Go to www.readwin2000.com to download
ReadWin®2000 today.
HART®device TMT 182 HART®communication is all about easy, reliable data access and getting better information more
inexpensively. iTEMP®transmitters integrate seamlessly into your existing control system and provide painless
access to preventative diagnostic information.
Configuration with a DXR 275 or 375 hand-held or a PC with configuration program (Commuwin II,
ReadWin®2000) or configure with AMS or PDM.
Field transmitter TMT 162 Field transmitter with HART®communication and blue backlit display. Can be read easily from a distance, in
sunlight and at night. Large measurement value, bargraph and fault indication displayed. Benefits are: dual
sensor input, highest reliability in harsh industrial environments, mathematic functions, thermometer drift
monitoring and sensor back-up functionality, corrosion detection.
Upper Temperature Limits for Various Sheath Diameters °F (°C)
Nominal Diameter Thermocouple Type
Sheath OD Element wire
Dia. (in)
Element wire
Gauge
TJEKN
∅1/16" 0.010 30 500 °F (260 °C) 825 °F (440 °C) 950 °F (510 °C) 1690 °F (920 °C)
∅1/8" 0.020 24 600 °F (315 °C) 970 °F (520 °C) 1200 °F (650 °C) 1960 °F (1070 °C)
∅3/16" 0.029 21
700 °F (370 °C)
1150 °F (620 °C) 1350 °F (730 °C)
2100 °F (1150 °C)∅¼" 0.039 19 1330 °F (720 °C) 1510 °F (820 °C)
∅3/8" 0.060 15
Maximum Element
Temperature Range Limits
-454 to 752 °F
(-270 to +400 °C)
-346 to 2192 °F
(-210 to +1200 °C)
-454 to 1832 °F
(-270 to +1000 °C)
-454 to 2500 °F
(-270 to +1372 °C)
-454 to 2372 °F
(-270 to +1300 °C)

TH51, TH52, TH56
4Endress+Hauser
Performance characteristics
Response time 63% response time per ASTM E839
!Note!
Response Time for the sensor assembly without transmitter
Maximum measured error Thermocouples corresponding to ASTM E-230.
!Note!
For measurement errors in °F, calculate using equation above in °C, then multiply the outcome by 1.8.
Measurement accuracy trans-
mitter
Transmitter
Transmitter long-term stabi-
lity
≤0.18 °F / year (≤0.1 °C / year) or ≤0.05% / year
Data under reference conditions; % is related to the set span. The larger value applies.
Junction Style ∅1/16" ∅1/8" ∅3/16" ∅1/4" ∅3/8"
Grounded 0.3 0.6 0.9 1.3 3.5
Ungrounded 0.4 1.6 2.4 2.9 7.2
Temperature Range Standard Tolerance
(IEC Class 2)
Special Tolerance
(IEC Class 1)
Type [°C] [°F] [°C]
(whichever is greater)
[°C]
(whichever is greater)
E 0 to 870 32 to 1600 ±1.7 or ±0.5% ±1 or ±0.4%
J 0 to 760 32 to 1400 ±2.2 or ±0.75% ±1.1 or ±0.4%
K 0 to 1260 32 to 2300 ±2.2 or ±0.75% ±1.1 or ±0.4%
T 0 to 370 32 to 700 ±1 or ±0.75% ±0.5 or ±0.4%
N 0 to 1260 32 to 2300 ±2.2 or ±0.75% ±1.1 or ±0.4%
TMT 181 multifunctional PCP TMT 182 HART®TMT 162 HART®Field Transmit-
ter
0.36 °F (0.2 °C) or 0.08%1
1) % is related to the adjusted measurement range (the larger value applies)
0.36 °F (0.2 °C) or 0.08%1≤0.19 °F (0.105 °C)

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Endress+Hauser 5
Insulation resistance Insulation resistance for MgO insulated thermocouples with ungrounded hot junction between terminals and
probe sheath, test voltage 500 Vdc.
• 1,000 MΩat 77 °F (25 °C)
These values for insulation resistance apply also between each thermocouple wire at single and duplex
constructions with ungrounded hot junction.
Galvanic isolation Galvanic isolation of Endress+Hauser iTEMP®transmitters (input/output)
In applications where fast response time is needed, grounded thermocouples are recommended. This
thermocouple design may cause a ground loop. This can be avoided by using iTEMP transmitters with high
galvanic isolation.
Wiring
Wiring diagrams Type of sensor connection TH51
!Note!
TH52 is available only with conductor external lead wires, DIN rail transmitters (TMT 121 PCP / TMT 122
HART®) are available, see 'Documentation'.
!Note!
The blocks and transmitters are shown as they sit inside the heads in reference to the conduit opening.
Wire specifications TH51
Thermocouple grade, TFE insulated 20AWG, 7 strands with wire termination
Transmitter type Sensor
TMT 181 PCP Û = 3.75 kV AC
TMT 182 HART®U = 2 kV AC
TMT 162 HART®Field transmitter U = 2 kV AC
Head transmitter mounted Terminal block mounted
T09-TH5156xx-04-xx-XX-ae-000 T09-TH5156xx-04-xx-XX-ae-001

TH51, TH52, TH56
6Endress+Hauser
TH52
All thermocouple extension wires are thermocouple grade.
Thermocouple wire types, Construction and Characteristics
!Note!
Flex armor is 0.272" nominal OD, 304SS 0.010" thick, square lock style.
TH52 is also available with connector, see section "Connector style".
Connector style Type of connectors TH52 and TH56, standard and miniature plugs
Sheath OD No of elements Extension wire (gauge)
∅1/16" 124
224
∅1/8" 120
224
∅3/16" 120
224
∅¼" 120
220
∅3/8" 120
220
Type
Single conductor Duplex conductor Max. conti-
nuous tempe-
rature
Notes
Insulation Impregnation Insulation Impregnation
Fiberglass Glass Braid
0.006"
Silicone modi-
fied resin
Glass braid
0.006"
Silicone modi-
fied resin
900 °F
(482 °C)
Impregnation
retained to
400 °F (204 °C)
Teflon FEP extruded
0.008"
/ FEP extruded
0.010"
/ 400 °F
(204 °C)
A = STANDARD
T09-TH5156xx-04-xx-XX-ae-009
max. 350 °F
TH52, all types J and K
TH56, types J and K
3/16" and ¼" only
T09-TH5156xx-04-xx-XX-ae-008
max. 350 °F
All Others!
B = STANDARD W/ FEMALE
T09-TH5156xx-04-xx-XX-ae-003
max. 350 °F
C = MINI
T09-TH5156xx-04-xx-XX-ae-004
max. 350 °F

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Endress+Hauser 7
Thermocouple color codes per
ASTM E-230
D = MINI W/ FEMALE
T09-TH5156xx-04-xx-XX-ae-005
max. 350 °F
E = STANDARD
(HIGH TEMP.)
T09-TH5156xx-04-xx-XX-ae-006
max. 800 °F
G = STANDARD W/ FEMALE
(HIGH TEMP.)
T09-TH5156xx-04-xx-XX-ae-007
max. 800 °F
Y = SPECIAL
T.C.
Type
POS
NEG Material
MAGNETIC Insulation
Plug &
Jack1
1) References for Plug & Jack Color Codes are based on ASTM E-1129 / E 1129M - 98, Standard Specification of Ther-
mocouple connectors and ASTM E-1684, Standard Specification for Miniature Thermocouple Connectors.
YES NO Single
Conductor
Overall
T.C. wire
EEP (+) Nickel - 10% chromium X Purple Brown Purple
EN (-) Copper - 45% nickel (constantan) X Red
JJP (+) Iron X White Brown Black
JN (-) Copper - 45% nickel (constantan) X Red
KKP (+) Nickel - 10% chromium X Yellow Brown Yellow
KN (-) Nickel - 5% (aluminium, silicon)2
2) Silicon, or aluminium and silicon, may be present in combination with other elements.
XRed
TTP (+) Copper X Blue Brown Blue
TN (-) Copper - 45% nickel (constantan) X Red
NNP (+) Nickel - 14% chromium - 1.5% silicon X Orange Brown Orange
NN (-) Nickel - 4.5% silicon - 0.1% magnesium X Red

TH51, TH52, TH56
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Installation conditions
Orientation No restrictions for installation orientation.
Installation instructions
T09-TH1112xx-11-xx-xx-ae-000
Installation examples
A - B: In pipes of a small section the axis line of the duct must be reached and, if possible, slightly exceeded by the tip of
the probe
C - D: Tilted installation
Insertion length
Minimum immersion length should be 10 times the OD of the sheath, nominal.
Environmental conditions
Ambient temperature Housing without head-mounted transmitter
• Aluminum pressure die-cast housing -40 to 302 °F (-40 to 150 ºC)
• Plastic housing -40 to 185 °F (-40 to 85 °C)
Housing with head-mounted transmitter
• -40 to 185 °F (-40 to 85 °C)
Shock and vibration resistance 4g / 2 to 150 Hz as per IEC 60 068-2-6

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Endress+Hauser 9
Process conditions
Process pressure limits p/T load curve example according to Dittrich.
!Note!
The calculation was done for pipes only, for MgO insulated thermocouples the values might be higher. In any
case for different lengths, other materials, variation in sheath diameter or wall thicknesses, stress analysis is
recommended. Failures are caused by forces imposed by static pressure, steady state flow, and vibration.
Max. allowable process pressure (PSIG) for instrumentation with one time adjustable compression fittings.
!Note!
Re-adjustable compression fittings are not intended to be used for pressure retaining applications and should
only be used tor the mechanical holding of sensors.
T09-TH1112xx-05-xx-xx-ae-000
T09-TH1112xx-05-xx-xx-ae-001
• L = insertion length
•v
a= flow velocity air
•v
w/s= flow velocity water or steam
Example calculation: Probe = 316 SS
sheath ∅= ¼", 0.028" wall thickness
!Note!
Avoid resonance frequency as this will
cause damage to the probe!
• L = 4 and 6 inch:
Resonance frequency occurs when
permanent flow velocity is at 18.1,
22.6 or 27.1 ft/s (air) for 6 inch and/
or 40.5, 50.6 or 60.8 ft/s (air) for 4
inch probe (T = 482 °F, p = 2700/
2600 psi).
• L = 9 and 12 inch:
Resonance frequency occurs when
permanent flow velocity is at 8.1, 10.1
or 12.1 ft/s (air) for 9 inch and/or
4.6, 5.7 or 6.8 ft/s (air) for 12 inch
probe (T = 482 °F, p = 2600 psi).
Temperature 1/8" NPT & ¼" NPT compression fitting
°F °C Sheath Ø =
1/16"
Sheath Ø =
1/8"
Sheath Ø =
3/16"
Sheath Ø =
¼"
Sheath Ø =
3/8"1
1) Not available with compression fittings 1/8" NPT
-20 to 300 -28 to 204 3300 2850 3150 3350 3900
400 204 3200 2750 3050 3250 3800
500 260 3000 2550 2850 3000 3500
600 316 2800 2400 2700 2850 3300
700 371 2700 2350 2600 2750 3200
800 427 2650 2300 2550 2650 3100
900 482 2600 2200 2450 2600 3050
1000 538 2400 2100 2300 2450 2850

TH51, TH52, TH56
10 Endress+Hauser
Mechanical construction
Design, dimensions
T09-TH1112xx-06-xx-xx-ae-000
For values related to this graphic please refer to the table below.
!Note!
Duplex version (2 elements) of TH56 is not available.
Dimensions in inches:
Immersion length X Wire length B Sheath
diameter A
Wall
thickness S
TH51 TH52 TH56
4", 6", 9", 12" 6", 12", 18", 24" 12", 18", 24", 48",
72", 96"
48", 72", 120"
specified length
12" to 3600" in
12" increments
∅1/16" 0.007"
∅1/8" 0.014"
∅3/16" 0.022"
∅1/4" 0.029"
specified length 2" to 96" in ½" increments ∅3/8" 0.045"