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General
Thermocouples with replaceable measuring are used for temperature measurement in
- Tanks and pipelines,
- In gaseous and liquid media such as air, steam, gases, water, oil, etc.
- In low-and high-pressure area.
This catalog contains ready-to-install thermocouples and empty valves (without measuring)
- For operating temperatures up to 1000 ° C,
- For pressures to 650 bar,
- Also for use in hazardous areas and equipment.
All fittings of this catalog can by replacing the measuring resistance thermometers to be converted.
Structure and types of election
The outer protection tube is a screw, welding or flange connection with the vessel or the piping connected. The measuring is built with the thermo couple is inserted into the protective tube is inserted and then head of the compensation lines. It can operate without interruption to be replaced.
Protect pipes and fittings
The selection of a protection tube depends on the spatial conditions at the installation (mounting) and the stresses caused by temperature, pressure, flow and chemical attack.
Detailed instructions on installation of favorable thermocouples can be found in the VDE-VDI guidelines.
Resistant metal protective pipe materials:
- St 35.8 WNr. 1.0305
550 ° C in air. Low resistance to sulphurous gases, medium resistance to nitrogen gases
- St 35.8 WNr. 1.0305 - feueremalliert
for temperatures of max. 550 °C, max. 1 bar gauge pressure for the low pressure area in the furnace, flue gas ducts and vessels.
- X10Cr Al 24 WNr. 1.4762
for temperatures of max. 1200 °C an Luft. 1200 ° C in air. Major resistance to sulfur gases, low resistance to nitrogen gases.
- 13 Cr Mo 44 WNr. 1.7335 1.7335
- 10 Cr Mo 9 10 WNr. 1.7380
heat-resistant Cr-Mo steels, according to the AD leaflets in pressure vessels for operating temperatures max. 560 °C geeignet.
- X 8 Cr Ni Nb 16 13 WNr. 1.4961 High-temperature austenitic steel 1.4961, equivalent to the AD leaflets in pressure vessels for operating temperatures max. 750 °C.
- C 22 WNr. 1.0402 unalloyed carbon steel, according to the AD leaflets in pressure vessels for operating temperatures max. 450 °C geeignet.
- Cu Sn 6 WNr. 2.1020 copper-tin alloys with good thermal conductivity and corrosion resistance (eg in seawater), operating temperatures max. 250 °C.
- X 6 Cr Ni Ti 18 10 WNr. 1.4541
- X 6 Cr Ni Mo Ti 17 22 2 WNr. 1.4571 max temperatures 700 ° C in air capable, stainless and acid resistant steels, primarily for the chemical and petrochemical, good resistance to aggressive media such as the hot water treatment in steam power plants and in food industry
For extreme Korrisionsbedingungen can protect pipes made of special materials are delivered,
for example:
- WNr. 1.4841, 2.4816, 2.4858, 2.4610, 2.4617, titanium, tantalum, etc.
- Copper or steel, Tantalum Plating
- Steel or nonr. with Teflon coating
- Bepanzerungen against abrasion for different temperature ranges
It is advisable for the protection tube preferably the same material to use from the tank, the piping installation, etc. of the body exists.
Einschraubzapfen or resting on flanges are generally made of materials of the same alloy group as the protection tubes.
Especially the issue of chemical stability in each case must be carefully considered, often only bring operation digestion experiments, since even small impurities in the medium of the behavior of a material can change greatly.
The resilience of protective tubes depends on many factors and can only approximate as calculated. May be indicative of the strain diagrams at the end of this catalog (DIN 43763) are taken, for the vertical inflow apply.
Different lengths of installation, the use of other protective pipe materials with different fatigue performance, while others Anströmungsverhältnisse, media with different density or additional stress corrosion lead to other load limits.
Measuring
Thermocouple-measurement with 1 or 2 pairs of thermocouples are available in two designs available:
- Type TM with using pipe. The thermocouple wires are available in ceramic Mehrlochkapillaren use in a stainless steel tube inserted.
- Type TM-F sheath with a pipe. In an outer stainless steel sheath, the thermocouple wires in highly densified MgO or Al 2 O 3 -powderembedded Fest. This measurement is particularly noted vibration.
Maximum operating temperature of measurement:
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Thermo couple type
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TM with using pipe
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TM-F with cable sheath
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L,J
K,N
S
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600 °C
850 °C
--
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800 °C
1100 °C
1100 °C1)
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1) from 900 ° C danger of stability loss by 2.4816 material precipitates
The thermocouple voltages are
- DIN IEC 584 Tolerance Class 1 or
- DIN 43710
Attention:
For the thermocouple Fe-CuNi couple of new plants is just the type J according to DIN IEC 584 permitted. The core values differ from the previous type L after DIN 43710, which is only for replacement in existing installations to be used.
The measurement points of the thermocouple pairs are electrically from the use of pipe or insulated jacket. The dot-shaped measurement site is located a few mm from the bottom of the deployment tube.
The use of pipe or Meßeinsatzmantel is equipped with a ceramic socket connection associated with the 2 screws in the connector head is attached. By Andrückfedern is the tip of the measuring against the bottom of the protective tube is pressed. This is a better heat transfer is reached, measuring the vibration is avoided and thermal strain compensated.
For the explosion-proof versions EExd be specific, the Ex-protection provisions of appropriate managerial mantle measurement used to operate only in the valves of the protection can be installed.
Measurement to other standards, tolerances, or designs for incorporation into the protective valve of this catalog are in our catalog "measurement" is offered.
The appointment of a thermocouple is then over 2 order numbers:
- Type the valve "without measuring from the variant program
- Type of measuring from our catalog "measurement"
Note:
The maximum operating temperature of a valve is the smaller component of measuring and protective tube.
Connection heads
For different operating conditions are 6 models with port sizes according to DIN 43729 are available.
All models are water resistant, protection class IP 53, 54 or IP 65 They are suitable for ambient temperatures up to 200 ° C or 120 ° C for the plastic version.
For our standard models, the connection head type BUS, or C is used, which has proved particularly. For ex-protected thermocouples find special connector heads use.
Schnellansprechende thermocouples
Protection tubes according to DIN have stable housing by a relatively large mass, the result is a longer response time of the probe.
Schnellansprechende thermocouples have a rejuvenated protective tube top and contain thinner sheath management measurement. This is the heat capacity of the sensor greatly reduces the response time and significantly reduced, without the mechanical strength of the thermocouple noticeably affected.
The table gives the approximate schnellansprechender response thermocouples (measured from 20 to 100 ° C) compared to measurement without an additional outer protective tube.
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Response times (approximate) in seconds
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im water, v = 0,4 m/s
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in air, v = 3 m/s
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Type
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0,5
Time value
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0,9
Time value
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0,5
Time value
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0,9
Time value
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Thermo-
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AS, BS, CS
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10
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35
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60
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180
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couple
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D4S
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12
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43
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145
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450
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D5S
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14
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45
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180
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510
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TM 6 mm
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15
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40
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50
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140
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Meßeinsatz
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TM-F 6 mm
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3,0
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7,5
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45
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120
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TM-F 3 mm
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0,8
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2,1
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15
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48
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Transducer
All sensors of this catalog (except Type KTH and KT) with a built-in transmitter can be equipped. There are 2 versions available:
- Meßeinsatz And measuring transducer as a unit
- Meßeinsatz And measuring transducer as separate units, with the connection head with a high cap and the transducer is mounted in this. Advantage: measuring and transmitters are separately replaceable
Explosion
Thermocouples type A, B, C, F, D and PC are also in protection Eexib II CT4 to T6 stock, suitable for installation in intrinsically safe circuits in accordance with PTB Certificate of Conformity
No Ex-80/2006x.
Welded protection tube type D according to DIN 43763
The protection tubes we use are manufactured according to DIN 43763. This standard requires, inter alia, material and pressure-tested before.
Delivery
The product group "thermocouples with replaceable measuring" covers 6 basic types, based on the overview pages are displayed.
Standard designs
Standard designs are a selection of frequently used designs. They are short, often from stock and are also in small quantities cheaply available.
Variants
Variants broaden the scope of the standard program by combining shapes, materials and dimensions
By using standardized components and parts can be a variety of forms, with most technical demands could be met quickly and efficiently produce.
Special designs
Special designs for specific applications, eg
- Other protective pipe materials,
- metallic or non-metallic protective coatings, pipe, or
- Other dimensions
require, are available on special request. We ask about the following information:
- description of the measuring and installation conditions (preferably with sketch)
- description of the probe (dimensions and materials) if there are ideas for constructing
- Indication of the order, subscription or order number, if previously a similar special version has been purchased from ourselves.
Items
Measurement, protection tubes and hlußköpfe of catalog types can also be used as individual modules or agents.
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