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

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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

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Omnigrad S -TR61

L=250 mm; Vsteam = 40 m/s

100

100 150

200 250 300

°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

L = 250 mm; Vair = 40 m/s

Maximum pressure allowed

L = 400 mm; Vair = 40 m/s

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

21 s 37 s 55 s

7,5 s -- 18 s

21 s -- 55 s

-- 10 s 38 s

-- 24 s 125 s

Self heating Negligible when the E+H iTEMP® transmitters are employed.

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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.

Fig. 3: Installation examples

METALLIC SHEATH

THERMAL INSULATING

h d/2

L > D/2+h

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.

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