Page 1
Technical Information
Omnigrad T TST310
RTD thermometer
Can be screwed in or inserted
With fixed connected cable and anti-kink spring
Application
The resistance thermometer is specially suited to
temperature measurement in machinery, laboratory
equipment and plants in gaseous or liquid media like air,
water, oil and others.
Your benefits
• High flexibility through user-specific insertion lengths
and variable process connections
• Fast response time
• Single or double Pt100 sensor of accuracy class A, B,
or AA as per IEC 60751
• Types of protection for use in hazardous locations:
Intrinsic Safety (Ex ia)
Non-Sparking (Ex nA)
TI00085T/09/en
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TST310
Function and system design
Measuring principle These resistance thermometers use a Pt100 temperature sensor according to IEC 60751. This 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
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 (1112 °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). For this reason, thin-film sensors are
generally only used for temperature measurements in ranges below 400 °C (932 °F).
-1
.
Measuring system
Example of an application
A Built-in RTD thermometer TST310
B Temperature transmitter iTEMP
resistance thermometer in a 2, 3, or 4-wire connection and converts them into an analog 4 to 20 mA measurement
signal.
C RIA16 field display unit
– The display unit measures the analog signal from the transmitter and shows this on the display. The LC display shows
the current measured value in digital form and as a bar graph indicating a limit value violation. The display unit is
looped into the 4 to 20 mA circuit and gets the required energy from there. More information on this can be found
in the Technical Information (see "Documentation").
D Active barrier RN221N
– The RN221N active barrier (24 V DC, 30 mA) has an 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").
®
DIN rail TMT12x. The two-wire transmitter detects the measurement signals of the
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TST310
Equipment architecture
Thermometer design, dimensions in mm (in)
1
Without process connection
2
With brazed process connection
3
With adjustable compression fitting
4
Cable sensor with ∅D = 3 mm (0.12 in) or 6 mm (0.24 in)
5
Transition sleeve
6
Anti-kink spring, 50 mm (1.97 in)
7
Connecting cable with variable cable diameter
∅K, see Table 'Connecting cable'
8
Process connection versions
L
Connecting cable length
NL
Insertion length
a0012728
The resistance thermometers of the Omnigrad T TST310 series are designed as cable sensors. The actual RTD
sensor element is fitted in the sensor tip and mechanically protected. In principle there are bendable and nonbendable versions of the cable sensor; for details, see → ä 9. The cable sensors generally consist of a stainless
steel tube in which the leads of the sensor element are routed and electrically insulated. Only the bendable
version uses mineral-insulated sheathed cables instead. The corresponding connecting cable is fastened to the
sensor using a transition sleeve.
The thermometer can be installed using either a movable compression fitting or a process connection firmly
brazed onto the thermometer. In addition, versions can be delivered for insertion without a special process
connection. For detailed process connection versions, see → ä 7.
Connection cable
Cable insulation; sheathing; leads Option Cable diameter ∅K in mm (in)
PVC; PVC; 4-wire A 4.8 (0.19)
PTFE; Silicone; 4-wire B 4.6 (0.18)
PTFE; PTFE; 4-wire C 4.5 (0.178)
PTFE; Silicone; 2x3-wire D 5.2 (0.2)
PTFE; Silicone; 4-wire E 4.0 (0.16)
Measurement range • -50 to +400 °C (-58 to +752 °F), bendable version, mineral-insulated sheathed cable
• -50 to +250 °C (-58 to +482 °F) non-bendable version, insulated sensor wires in the stainless steel tube
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Performance characteristics
Operating conditions Ambient temperature
The permitted ambient temperature is dependent on the material used for the electrical connecting cable and
the cable sheath insulation:
TST310
!
Material
Connection cable / sheath insulation
PVC / PVC 80 °C (176 °F)
PTFE / silicone 180 °C (356 °F)
PTFE / PTFE 200 °C (392 °F)
Process pressure
Max. process pressure (static) ≤ 75 bar (1088 psi).
Note!
For the maximum permitted process pressures for the respective process connections, refer to the Chapter
"Process connection" → ä 7.
Permitted flow velocity depending on the immersion length
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
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 1 MPa (10 bar
= 145 PSI).
Max. temperature in °C (°F)
Permitted flow velocity
- Insert diameter 3 mm (0.12 in) ------------
- Insert diameter 6 mm (0.24 in) - - - - - -
A Medium water at T = 50 °C (122 °F) L Immersion length
B Medium superheated steam at T = 400 °C (752 °F) v Flow velocity
Shock and vibration resistance
3g / 10 to 500 Hz as per IEC 60751 (RTD-Thermometer)
Degree of protection
IP65
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TST310
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)
Accuracy RTD corresponding to IEC 60751
Class max. Tolerances
Temperature range Characteristics
(°C)
RTD max. error type TF - range: -50 to +400 °C
1)
Cl. A ± (0.15 + 0.002 · |t|
Cl. AA,
± (0.1 + 0.0017 · |t|1)) 0 °C to +150 °C
) -50 °C to +250 °C
former 1/3
Cl. B
Cl. B ± (0.3 + 0.005 · |t|
1)
) -50 °C to +400 °C
RTD max. error type WW - range: -200 to +600 °C
1)
Cl. A ± (0.15 + 0.002 · |t|
Cl. AA,
± (0.1 + 0.0017 · |t|
) -200 °C to +600 °C
1)
) 0 °C to +250 °C
former
1/3 Cl. B
Cl. B ± (0.3 + 0.005 · |t|
1)
) -200 °C to +600 °C
1) |t| = absolute value °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 60751; 10 K temperature step changes. Sensor Pt100,
TF/WW:
Insulation resistance Insulation resistance (measured with a voltage of 100 V DC) ≥100 MΩ at ambient temperature.
!
Cable probe diameter Response time
Mineral-insulated cable
6 mm (0.24 in) t
3 mm (0.12 in) t
Insulated sensor wires
6 mm (0.24 in) t
3 mm (0.12 in) t
Note!
Response time for the cable probe without transmitter.
a0008588-en
50
t
90
50
t
90
50
t
90
50
t
90
3.5 s
8 s
2 s
5 s
9 s
28 s
6 s
18 s
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TST310
Self heating RTD elements are passive resistances that are measured using an external current. This measurement current
causes a self heating 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
®
temperature transmitter (very small measurement current) is connected.
iTEMP
Calibration specifications Endress+Hauser provides comparison temperature calibration from -80 to +600 °C (-110 °F to 1112 °F) based
on the International Temperature Scale (ITS90). Calibrations are traceable to national and international
standards. The calibration report is referenced to the serial number of the thermometer.
Cable probe: Ø6 mm (0.24 in) and Ø3 mm (0.12 in) Minimum insertion length in mm (in)
Temperature range
-80 °C to -40 °C (-110 °F to -40 °F) 200 (7.87)
-40 °C to 0 °C (-40 °F to 32 °F) 160 (6.3)
0 °C to 250 °C (32 °F to 480 °F) 120 (4.72)
250 °C to 550 °C (480 °F to 1020 °F) 300 (11.81)
Material Cable probe and process connection.
The temperatures for continuous operation specified in the following table are only intended as reference values
for use of the various materials in air and without any significant compressive load. The maximum operation
temperatures are reduced considerably in some cases where abnormal conditions such as high mechanical load
occur or in aggressive media. Please observe also the measuring range of the temperature sensor (→ ä 3).
Material name Short form Recommended max.
temperature for
continuous use in
air
AISI 316L/
1.4404
AISI 316Ti/
1.4571
X2CrNiMo17-12-2 650 °C (1200 °F) • Austenitic, stainless steel
X6CrNiMoTi17-12-2 700 °C (1292 °F) • Properties comparable to AISI316L
Properties
• High corrosion resistance in general
• Particularly high corrosion resistance in chlorine-based and acidic, non-oxidizing atmospheres
through the addition of molybdenum (e.g. phosphoric and sulfuric acids, acetic and tartaric
acids with a low concentration)
• Increased resistance to intergranular corrosion and pitting
• Addition of titanium means increased resistance to intergranular corrosion even after welding
• Broad range of uses in the chemical, petrochemical and oil industries as well as in coal
chemistry
• Can only be polished to a limited extent, titanium streaks can form
Connecting cable insulation
Designation Features
PVC (polyvinyl
chloride)
Silicone • Flame-retardant, flame-resistant
PTFE • Resistance to nearly all chemicals
• Very good acid resistance
• High hardness, resistance to inorganic chemicals, particularly acids and alkalis
• Low impact strength and low temperature stability
• Permanently elastic at high and low temperatures
• Aging and weather-resistant
• Ozone and UV-resistant
• Oil, solvent, and fuel-resistant (fluorosilicones), water-repellent
• Flue gas-resistant
• Good mechanical loading capacity over a broad temperature range
• Working temperature up to +200 °C (+392 °F)
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TST310
Weight ≥ 100 g (3.53 oz), depending on version, e. g. 150 g (5.3 oz) for version NL = 100 mm (3.93 in) and brazed
thread process connection G½".
Components
Process connection The process connection is the connection between the process and the thermometer. This connection is
realized by a brazed connection thread with fixed position or a adjustable compression fitting. When using a
compression fitting the thermometer is pushed through a gland and fixed using a compression ferrule.
• Brazed process connection thread
Maximum process pressure: 75 bar (1088 psi) at 20 °C (68 °F).
• SS316-compression ferrule
Can only be used once, the compression fitting cannot be repositioned on the protection tube after loosening.
Fully adjustable insertion length on initial installation. Maximum process pressure: 40 bar at 20 °C (580 psi
at 68 °F).
• PTFE-compression ferrule
Can be reused, after loosening the fitting can be moved up and down the protection tube. With fully
adjustable insertion length. Maximum process temperature: 180 °C (356 °F),
maximum process pressure: 5 bar at 20 °C (73 psi at 68 °F).
Process connection
Adjustable compression fitting with connection thread Brazed process connection
Dimensions in mm (in). NL = Insertion length
Type Connection thread L in mm
Compression fitting G1/8" 35 (1.38)
G¼" 40 (1.57) 19 SS 316 / PTFE
G½" 47 (1.85) 15 (0.6) 27 SS 316 / PTFE
1/8" NPT 35 (1.38) 4 (0.16) 12
½" NPT 50 (1.97) 8 (0.32) 22
M10x1
M8x1 12
Process connection,
brazed
G¼"
G½" 15 (0.6) 27
M10x1
M8x1 12
(in)
35 (1.38) 10 (0.4)
-
TL in mm
(in)
10 (0.4)
12 (0.47) 17
10 (0.4)
Width across
flats SW/AF
14 SS 316 / PTFE
14
14
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Material compression
ferrule K
SS 316¼" NPT 40 (1.57) 6 (0.24) 14
PTFE
-
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TST310
red
red
white
black
white
black
yellow
red
white
red
white
1 x Pt100
3 wire
1 x Pt100
4 wire
2 x Pt100
3 wire
2 x Pt100
2 wire
red
black
yellow
red
red
white
Spare parts
Spare part set TA50 compression fitting Material-No.
∅ 6.1 mm (0.24 in); G¼", G3/8", G½", G¾", ¼" NPT, ½" NPT, ¾" NPT;
60011600
material ferrule PTFE (10 pieces)
∅ 3 mm (0.12 in); G1/8", G¼"; material ferrule PTFE (10 pieces) 60011598
∅ 6.1 mm (0.24 in); G¼", G3/8", G½", G¾", ¼" NPT, ½" NPT, ¾" NPT;
60011599
material ferrule SS 316 (10 pieces)
∅ 3 mm (0.12 in); G1/8", G¼"; material ferrule SS 316 (10 pieces) 60011575
Wiring
Wiring diagrams The thermometer is wired with the flying leads of the connecting cable. The thermometer can be connected
to a separate temperature transmitter, for example.
Core cross-section ≤ 0.382 mm2 (22 AWG) with end sleeves, length = 5 mm (0.2 in).
Wiring diagram flying leads
Installation conditions
Orientation No restrictions.
Installation instructions
Installation examples
A: Installation in a tank.
B: For pipes with a small cross-section, the sensor tip must reach to the piping axis or a little farther (=NL).
C: Tilted orientation.
The insertion length of the thermometer can influence the accuracy. If the insertion length is insufficient, heat
dissipation via the process connection and the container wall can cause measurement errors. For installation
a0012730-en
a0012731
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TST310
!
in a pipe, therefore, the recommended insertion length ideally corresponds to half of the pipe diameter (see
Figure 'Installation examples', Pos. B).
• Installation possibilities: Pipes, tanks or other plant components
• The insertion length for the bendable version should correspond to at least about ten times the cable sensor
diameter (∅D); for the non-bendable version with insulated sensor wires it should correspond to at least
about thirty times the cable sensor diameter.
Example: Diameter 3 mm (0.12 in) x 30 = 90 mm (3.54 in). A standard insertion length of > 60 mm
(2.36 in) is recommended for the bendable version and > 180 mm (7.1 in) for the non-bendable version.
• ATEX certification: Observe the installation instructions in the Ex documentation!
Note!
For pipes with small diameters, sometimes only small thermometer insertion lengths are possible.
Improvements can be achieved by inserting the thermometer at a tilted installation (see Figure 'Installation
examples', Pos. C). To determine the necessary insertion lengths, the parameters of the thermometer and of
the process to be measured must always be taken into consideration (e.g. flow velocity, process pressure).
Installation of the thermometer in a thermowell is not recommended.
Bendable cable sensor
Cable sensors with a MgO sheathed cable are bendable, taking into account the minimum dimensions specified
in the table. Bending of cable sensors with insulated sensor wires is not permitted.
Bending radius R
• R > 15 mm (0.6 in) for
ØD = 3 mm (0.12 in), NL ≥ 25 mm
(1 in)
• R > 30 mm (1.2 in) for
ØD = 6 mm (0.24 in), NL ≥ 65 mm
(2.56 in)
a0012734
Certificates and approvals
CE Mark The device meets the legal requirements of the EC directives if applicable. Endress+Hauser confirms that the
device has been successfully tested by applying the CE mark.
Hazardous area approvals For further details on the available Ex versions (ATEX, CSA, FM, etc.), please contact your nearest
Endress+Hauser sales organization. All relevant data for hazardous areas can be found in separate Ex
documentation. If required, please request copies.
Other standards and guidelines
PED approval The thermometer complies with paragraph 3.3 of the Pressure Equipment Directive (97/23/CE) and is not
• IEC 60529:
Degrees of protection by housing (IP-Code).
• IEC 61010-1:
Safety requirements for electrical measurement, control and laboratory instrumentation.
• IEC 60751:
Industrial platinum resistance thermometer
• IEC 61326-1:
Electromagnetic compatibility (EMC requirements)
marked separately.
Test report and calibration The "Factory calibration" is carried out according to an internal procedure in a laboratory of Endress+Hauser
accredited by the European Accreditation Organization (EA) to ISO/IEC 17025. A calibration which is
performed according to EA guidelines (SIT or DKD calibration) may be requested separately. The entire
thermometer - from the process connection to the tip of the thermometer - is calibrated.
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TST310
Ordering information
Product structure This information provides an overview of the order options available. The information is not exhaustive,
however, and may not be fully up to date. More detailed information is available from your local
Endress+Hauser representative.
RTD Thermometer TST310
010 Insert Diameter; Calibration:
A 3 mm
B 6 mm
Y Special version, TSP-No. to be specified
1 3 mm, 1x Pt100; calibration 0, 100 °C
2 6 mm, 1x Pt100; calibration 0, 100 °C
3 3 mm, 2x Pt100; calibration 0, 100 °C
4 6 mm, 2x Pt100; calibration 0, 100 °C
020 Insertion Length NL:
1 100 mm
2 150 mm
3 250 mm
4 300 mm
5 350 mm
7 500 mm
8 ..... mm
9 ..... mm, as specified
030 Insert Material:
A -50/+400 °C, MgO; 316L
B -50/+250 °C, insulated wires, 316Ti, max. NL=500 mm
Y Special version, TSP-No. to be specified
040 RTD Class; Wiring:
1A3 1x Pt100 A; 3-wire
1A4 1x Pt100 A; 4-wire
1B3 1x Pt100 B; 3-wire
1B4 1x Pt100 B; 4-wire
1C3 1x Pt100 AA; 3-wire
1C4 1x Pt100 AA; 4-wire
2A3 2x Pt100 A; 3-wire
2B2 2x Pt100 B; 2-wire
2B3 2x Pt100 B; 3-wire
2C3 2x Pt100 1/3DIN B; 3-wire
9Y9 Special version, TSP-No. to be specified
050 Process connection:
A Not needed
B Thread G¼", 316 brazed
C Compression fitting G¼", 316; ferrule PTFE
D Compression fitting G¼", 316; ferrule 316
E Thread G½", 316 brazed
F Compression fitting G½", 316; ferrule PTFE
G Compression fitting G½", 316; ferrule 316
J Compression fitting ½" NPT, 316; ferrule 316
K Compression fitting 1/8" NPT, 316; ferrule 316
L Compression fitting ¼" NPT, 316; ferrule 316
R Thread M10x1; 316 brazed
S Compression fitting M10x1, 316; ferrule PTFE
U Compression fitting M8x1, 316; ferrule PTFE
V Thread M8x1, 316 brazed
X Compression fitting G1/8", 316; ferrule PTFE
Y Special version, TSP-No. to be specified
Z Compression fitting G1/8", 316; ferrule 316
060 Length Extension L:
1 1000 mm
2 2000 mm
3 3500 mm
4 4000 mm
8 ..... mm
9 ..... mm, as specified
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TST310
070 Wire; Sheath; Application:
A PVC; PVC; 4-wire, max. 80 °C
B PTFE; Silicone; 4-wire, max. 180 °C
C PTFE; PTFE; 4-wire. max. 200 °C
D PTFE; Silicone; 2x3-wire, max. 180 °C
E PTFE; Silicone rubber; 4-wire, max. 150 °C, blue
Y Special version, TSP-No. to be specified
080 Connection Cable:
1 Flying leads
9 Special version, TSP-No. to be specified
090 Additional Option:
A Not needed
E ATEX II1/2D Ex iaD 21, II1G Ex ia IIC
F ATEX II1D Ex iaD 20, II1G Ex ia IIC
G ATEX II 1 G Ex ia IIC
H ATEX II 3 GD EEx nA II
I NEPSI Ex is IIC T6
P IECEx Ga Ex ia IIC T6
Y Special version, TSP-No. to be specified
995 Marking:
TAG Tagging (TAG)
TST310- ← Order code (complete)
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Documentation
Instruments International
Endress+Hauser
Instruments International AG
Kaegenstrasse 2
4153 Reinach
Switzerland
Tel.+41 61 715 81 00
Fax+41 61 715 25 00
www.endress.com
info@ii.endress.com
Hazardous area supplementary documentation:
• RTD/TC Thermometer Omnigrad TRxx, TCxx, TSTxxx, TxCxxx ATEX II3GD (XA044r/09/a3)
• RTD/TC inserts and cable thermometers Omniset TPR100, TPC100, TST310, TSC310 ATEX II1GD or II
1/2GD (XA087r/09/a3)
Application example Technical Information:
• Temperature transmitter:
–iTEMP
–iTEMP
• Field display RIA16 (TI144r/09/en)
• Active barrier with power supply RN221N (TI073r/09/en)
®
HART® DIN rail TMT122 (TI090r/09/en)
®
PCP DIN rail TMT121 (TI087r/09/en)
TST310
TI00085T/09/en/01.11
71108017
FM 9.0
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