Endress+Hauser S TR61 Specifications
Technical Information
71098772
Omnigrad S -TR61
RTD thermometer EEx-d or EEx-ia certified, replaceable insert,
thermowell from pipe, process connection: threaded or flanged or sliding.
PCP (4...20 mA), HART® or PROFIBUS-PA® electronics
Range of uses
The Omnigrad S TR61 is an RTD industrial thermometer with
a inset (Pt100) and thermowell from pipe.
It is developed for the use in the chemical, petrochemical and
energy industries, but suitable also for other generic applications.
In compliance to EN 50014/18/20 (ATEX certification) it is
therefore particularly suitable also for hazardous areas.
When required, it’s also available with a transmitter(PCP,
HART® or PROFIBUS-PA®) into the housing.
The process connection of the thermowell can be threaded,
flanged or with a compression fitting in compliance to the standard rule DIN 43772 (form 2/3, 2G/3G and 2F/3F).
Application areas
• Chemicals industry
• Energy industry
• Gas Processing industry
• Petrochemical industry
• General industrial services
Features and benefits
• SS 316L/1.4404, SS 316Ti/1.4571 and Hast. C276/2.4819
for the “wetted” parts
• The most common process connections: threaded, flanged
and compression fitting are standard; others are on request
• Customized immersion length
• Surface finishing down to Ra < 0.8 μm
• Aluminium housing, with protection grade from IP66 to IP68
• Mineral oxide replaceable insulated insert (MgO) diameter:
3 or 6 mm
• PCP, HART® and PROFIBUS-PA®, (4...20 mA 2-wire transmitters)
• The accuracy of the sensing element (Pt100) is: class A or 1/3
DIN B (IEC 60751) with electrical connection to 2, 3 or 4
wires
• The sensing elements (Pt100) are available in wire-wound
WW (range:-200...600°C) or thin-film TF (range:-
50...400°C) with single or double Pt100 execution
• ATEX 1/2 GD EEx-ia certification
• ATEX 1/2 GD EEx-d certification
• ATEX 2 GD EEx-d certification
4 0
TI280T/02/en
Omnigrad S -TR61
Function and system design
Measuring principle The RTD (Resistance Temperature Detector), is a sensor where the electrical resistance varies with the tem-
perature. The material of the RTD is Platinum (Pt) with a value of the resistance (R), referred to a nominal value
at the temperature of 0°C = 100,00 Ω (in compliance to rule EN 60751; it is called Pt100). The very important
is to define the RTD; it is defined with a standard "α" value measured between 0°C and 100°C.
This value is: α = 3.85 x 10
The temperature is measured indirectly by reading the voltage drop across the sensing resistor in the presence
of a constant current flowing through it using Ohm’s. The measuring current should be as small as possible to
minimise possible sensor selfheating; normally this current is around 1mA, no higher.
The resistance value measured for each degree is about = 0,391 Ohm/K; over 0°C it is opposite proportional
at the temperature. The standard RTD connection at the plant instrument can be to 2,3 or 4 wires for simple
or double RTD element.
Equipment architecture The construction of the Omnigrad S TR61 temperature sensor is based on the following standards:
• EN 50014/18 (housing)
• DIN 43772 (thermowell)
• EN 600751 (inset).
-3
°C-1.
The housing is in painted aluminium alloy; it is suitable to contain a transmitter and/or the ceramic
block of the inset; the “Ingress Protection” is from
IP66 to IP68.
The thermowell can be made from tube with diameter 9, 11 or 12 mm.
The final part of the thermowell can be straight,
tapered or reduced.
The process connection of the thermowell can be
threaded (GAS or NPT), flanged (DIN or ANSI) or
with a compression fitting (see the section "System
components").
The replaceable inset is a probe’s tip with a Pt100
positioned into; it is placed inside the thermowell.
Material & Weight
Operating conditions
Fig. 1: TR61 with the various types of process connections and end parts of the probe
Housing Insert Process connection Weight
aluminium epoxy
coated
sheath in SS 316L/1.4404 fixed or sliding SS
316/1.4401
From 0.5 to 1.0 kg for standard
options
Performance
Operating condition or test Product type or rules Value or data of test
Ambient temperature housing (without head-mounted transmitter -40÷130°C
housing (with head-mounted transmitter) -40÷85°C
Process temperature Same of measurement range (see below).
Process pressure (Maximum) The pressure values to which the thermowell can be
Maximum flow velocity The highest flow velocity, (of the stream or of the fluid), tolerated by the thermowell,
Shock and vibration resistance
test
subjected at the various temperatures are illustrated
by the drawings in fig. 2 . For 9 mm diameter pipes,
with a limited flow velocity, the maximum tolerated
pressures are the following:
diminishes with increasing lengths, of the thermowell/probe exposed (fig. 2 ).
RTD Inset in according to the rule
IEC 60751:
Acceleration 3 g of peak
Frequency from 10Hz to 500Hz and back
Time of the test 10 hours
50 bar to 20°C
33 bar to 250°C
24 bar to 400°C
2 Endress+ Hauser
Omnigrad S -TR61
L=250 mm; Vsteam = 40 m/s
25
50
75
100
0
100 150
200 250 300
50
°C
Temperature
Maximum
pressure
allowed
125
150
350
400
Bar
450
Steam pressure
L=220 -> 280 mm; Vwater = 3 m/s
L=220 mm; Vair = 40 m/s
L=280 mm; Vair = 40 m/s
175
200
L=220 mm; Vsteam = 40 m/s
L=280 mm; Vsteam = 40 m/s
form 3
Accuracy
200
Bar
175
150
125
L = -> mm; Vwater=3m/s250 400
100
75
50
L = 250 mm; Vair = 40 m/s
Maximum pressure allowed
25
L = 400 mm; Vair = 40 m/s
0
50
form 2
Steam pressure
L = 250 mm; Vsteam= 40 m/s
L = 400 mm; Vsteam= 40 m/s
100 150 200 250 300
Temperature
form 3
Steam pressure
L = 220 -> 280 mm; Vwater = 3 m/s
L = 220 mm; Vair = 40 m/s
L=280mm; Vair=40m/s
Maximum pressure allowed
350
400
450
°C
200
L = 220 mm; Vsteam = 40 m/s
L = 280 mm; Vsteam = 40 m/s
Fig. 2: Pressure/temperature drawing for thermowell with straight tube ø 11 mm in SS 316Ti/1.4571(left), with tapered tube ø 12 mm in
SS 316Ti/1.4571 (right)
RTD maximum error type TF - Range: -50 to 400°C
Cl. A 3σ = 0.15+0.0020It|
3σ = 0.30+0.0050ItI
Cl. 1/3 DIN B 3σ = 0.10+0.0017It|
3σ = 0.15+0.0020ItI
3σ = 0.15+0.0020ItI
3σ = 0.30+0.0050ItI
= -50…250°C
= +250…400°C
= 0…100°C
= -50...0
= 100...250°C
= 250…400°C
DIN-IEC-EN 60751
2,0
Class B (°C)
1,5
1,0
Class A (°C)
Tolerance
0,5
-200 -100 0 100 200 300 400 500 600°C
Class 1/3 DIN B (°C)
±3σ = range including 99.7% of the readings. (|t|= absolute value of the temperature in °C).
RTD maximum error type WW - Range: -200 to 600°C
Cl. A 3σ = 0.15+0.0020It| = -200…600°C
2,0
1,5
DIN-IEC-EN 60751
Cl. 1/3 DIN B 3σ = 0.10+0.0017It|
3σ = 0.15+0.0020ItI
3σ = 0.15+0.0020ItI
= -50...250°C
= -200...-50
= 250…600°C
1,0
Class A (°C)
Tolerance
0,5
-200 -100 0 100 200 300 400 500 600°C
Class 1/3 DIN B (°C)
±3σ = range including 99.7% of the readings. (|t|= absolute value of the temperature in °C).
Others errors
Transmitter maximum error See the corresponding documentation (codes at the end of the document)
Display maximum error 0.1% FSR + 1 digit (FSR = Full Scale Range)
The “4 wires” configuration, is provided as a standard connection for the single Pt 100’s excludes additional
errors in every condition.
Generally in the “4 wires” configuration there is a higher guarantee of accurancy.
Response time Tests in water at 0.4 m/s (according to IEC 60751; from 23 to 33°C step changes)
Insulation
Diameter of the stem Pt100 type t
9TF / WWt
11 TF / WW t
12 TF / WW t
Measurement Insulation type Result
Insulation resistance between terminals and probe sheath above 100 MΩ at 25°C
according to IEC 60751, test voltage 250 V above 10 MΩ at 300°C
Reduced tip Tapered tip Straight tip
(x)
7,5 s 11 s 18 s
50
t
21 s 37 s 55 s
90
7,5 s -- 18 s
50
t
21 s -- 55 s
90
-- 10 s 38 s
50
t
-- 24 s 125 s
90
Self heating Negligible when the E+H iTEMP® transmitters are employed.
Endress+Hauser 3
Omnigrad S -TR61
Installation
The Omnigrad S TR61 thermometers can be installed on pipes or tanks by means of threaded or flanged connections. The immersion length must take into account all the parameters of the thermometer and the process
to measure. If the immersion is too low, an error may be generated in the temperature recorded due to the
lower temperature of the process fluid near to the walls and heat transfer, which takes place through the sensor
stem. The incidence of such an error can be not negligible if there is a big difference between the process temperature and the ambient temperature. To prevent measuring errors of this kind, it is advisable to use thermometer with a small diameter on well and an immersion length (L) of at least 80÷100 mm.
In small section ducts the tubing’s axis must be reached and preferibly slightly exceeded by the tip of the probe
(see fig. 3A-3C).
Insulation of the outer part of the sensor reduces the effect produced by a low immersion. Alternatively, it is
also possible to adopt a tilted installation (see fig. 3B-3D).
With regard to corrosion, the base material of the wetted parts (SS 316L, SS 316Ti, Hastelloy C) can tolerate
the common corrosive media right up to even the highest temperatures.
A
d
D
Fig. 3: Installation examples
h
L
L
C
METALLIC SHEATH
THERMAL
INSULATING
D
h d/2
»
L > D/2+h
B
For further information on specific applications, please contact the E+H Customer Service Department.
In the case that the sensor components are disassembled, in the following reassembly procedure the definite
torques must be employed. This will assure the housings with the IP grade defined.
In the case of vibrations the thin film sensing element Pt100 (TF) may offer advantages; the wire wound Pt100
(WW), besides having a larger measurement and accuracy range, guarantees greater long term stability.
4 Endress+ Hauser
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