Electrical
temperature measurement
Sheathed thermometer, stern tube
For shipbuilding industry
Models TR791, TC791
WIKA data sheet TE 69.30
T YPE
APPROVED
Applications
■■ Monitoring of temperatures in stern tubes
Special features
■■ Robust
■■ Flexible
■■ Approval Lloyd's Register
■■ Optional: with PTFE cable
Description
Electrical thermometers specifically for the monitoring of
temperatures in stern tubes. The flexible sheath and the
compression fitting enable individual adjustment to the
mounting position in the stern tube.
The flexible part of a sheathed sensor is a mineral-insulated
Model Tx791 sheathed thermometer with optional
cable, the sheathed cable. It consists of a stainless steel
connection box
outer sheath in which the internal lead is pressed and
isolated within a high-density ceramic mass.
Optional connection box and/or cable available.
For resistance thermometers a PTFE cable with an
aluminium shield is used, suitable up to 200 °C. The PTFE
glass fibre cable of the thermocouples is designed with metal
braiding and is suitable up to 250 °C.
To secure the cable, a second process connection can be
supplied as an option.
WIKA data sheet TE 69.30 ∙ 05/2014 Page 1 of 4
Resistance thermometer for model TR791 Process connection
Sensor tolerance value per DIN EN 60751 Connection type
■■ Class B Compression fitting
■■ Class A (not with 2-wire connection)
Material
The combination of 2-wire connection and Class A is not Stainless steel 1.4571
permissible.
Thread
With the 2-wire connection the lead resistance of the cable G ¼ B, G ⅜ B, G ½ B
compounds the error. The error increases with increasing
length of the sheath or of the cable. other versions on request
The thermometers described here are often designed
significantly longer than 1000 mm. Therefore, the 3-wire or
4-wire connection should be used.
Probe
For detailed specifications for Pt100 sensors, see Technical
Information IN 00.17 at www.wika.com. Design
Sheathed cable
Bending radius
Thermocouple for model TC791 The permissible bending radius is 3-times the sheath diameter.
Sensor type With the TR791 the probe tip is a rigid tube, approx. 60 mm
■■ K (NiCr-Ni) long.
■■ J (Fe-CuNi)
Material
Listed thermocouples are available both as single or dual Stainless steel 1.4571
thermocouples. The thermocouple will be delivered with an
insulated measuring point. Diameter
3, 4.5, 6.0 mm
Tolerance value
For the tolerance value of thermocouples, a cold junction Nominal length
temperature of 0 °C has been taken as the basis. To customer specification, min. 500 mm
Type K
Class Temperature range Tolerance value
DIN EN 60584 part 2
Connection box (option)
1 -40 ... +375 °C ± 1.5 °C
1 +375 ... +1000 °C ± 0.0040 ∙ | t | 1) Material
2 -40 ... +333 °C ± 2.5 °C Aluminium, epoxy coated
2 +333 ... +1200 °C ± 0.0075 ∙ | t | 1)
1) | t | is the value of the temperature in °C irrespective of the sign. Cover
Detachable, 2 mounting screws, EPDM flat seal
Type J
Cable glands
Class Temperature range Tolerance value Pg 16
DIN EN 60584 part 2
1 -40 ... +375 °C ± 1.5 °C Ingress protection
1 +375 ... +750 °C ± 0.0040 ∙ | t | 1) IP 67
2 -40 ... +333 °C ± 2.5 °C
2 +333 ... +750 °C ± 0.0075 ∙ | t | 1)
Terminal block
1) | t | is the value of the temperature in °C irrespective of the sign.
Ceramic, max. 1.5 mm², screws captive
Tolerance value at selected temperatures in °C Ground terminal
Temperature Tolerance value DIN EN 60584 part 2 Present
(ITS 90) Type K Type J
°C °C °C
0 ± 2.5 ± 2.5
200 ± 2.5 ± 2.5
400 ± 3.0 ± 3.0
600 ± 4.5 ± 4.5
800 ± 6.0 undefined
Page 2 of 4 WIKA data sheet TE 69.30 ∙ 05/2014
Cable (option)
■■ Model TR791 ■■ Model TC791
Insulation Insulation
PTFE PTFE glass fibre
Screen Armour
Aluminium foil Galvanised steel braid
Permissible ambient temperature Permissible ambient temperature
-200 ... +200 °C -200 ... +250 °C
Wire material Wire material
Cu (strands) Compensating cable depending on type of sensor (lead)
Wire cross-section Wire cross-section
0.25 mm² 0.22 mm²
Number of wires Number of wires
According to the number of sensors and the sensor Depends on the number of sensors
connection method
Wire ends
Wire ends Blank
Blank
Cable length
Cable length To customer specification
To customer specification
Dimensions in mm
Standard version with connection with connection box with connection box,
box (option) and cable (option) cable and second process
connection (option)
3376678.01
Sheathed Sheathed Sheathed
cable cable cable
Legend:
E Thread NL Nominal length
KL Cable length Ø D Sheath diameter
WIKA data sheet TE 69.30 ∙ 05/2014 Page 3 of 4
Electrical connection
Model TR791 with cable Model TR791 with terminal block in connection box
1 x Pt100, 2-wire 2 x Pt100, 2-wire
red white yellow
1 x Pt100, 2-wire
3160696.01
white yellow
white
red white
red
red
1 x Pt100, 3-wire
3376695.01
white
1 x Pt100, 3-wire 2 x Pt100, 3-wire
white yellow
red
red black
1 x Pt100, 4-wire red black
white
white red white
red
red
white 1 x Pt100, 4-wire
white
white
white
2 x Pt100, 2-wire
yellow red
yellow red
red
red
Model TC791 with terminal block in connection box
white
single thermocouple dual thermocouple
2 x Pt100, 3-wire black
black
3376695.01
yellow
Model TC791 with cable
For colour coding, see table below
Sensor type K Sensor type J
Colour coding
3160696.01
green black
Sensor type Standard Positive Negative
white white K DIN EN 60584 green white
J DIN EN 60584 black white
Ordering information
Model / Sensor type and number of sensors / Sensor connection method / Tolerance value / Process conenction / Nominal
length NL / Cable / Cable length KL / Connection box
© 2003 WIKA Alexander Wiegand SE & Co. KG, all rights reserved.
The specifications given in this document represent the state of engineering at the time of publishing.
We reserve the right to make modifications to the specifications and materials.
Page 4 of 4 WIKA data sheet TE 69.30 ∙ 05/2014
05/2014 GB
WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg/Germany
Tel. +49 9372 132-0
Fax +49 9372 132-406
info@wika.de
www.wika.de
