Process connections and Materials

The process connection is the connection between the thermometer and the process (pipes, tanks, etc). The following process connections are divided into:

Threads

Note::

Generally cylindrical and conical threads are distinguished.
Cylindrical threads in principle need a separate seal. When selecting the seal the compatibility with the medium and the process temperature have to be regarded.
On conical threads this depends on the used type.

- A thread guarantees the exchange of the    thermometer in the process.
- Fixed immersion length

Compression fitting

PTFE/Viton ferrule:
Can be reused, after loosening the fitting can be moved up and down the thermowell.

Note:

• Thread means that the thermometer can be exchanged in the process.
• Fully adjustable immersion length
• Max. Temp. PTFE: 180 °C / 6 bar
• Max. Temp. PEEK: 180 °C / 10 bar
• Max. Temp. Viton 180 °C / 5 bar

316/1.4401 ferrule:
Can only be used once, the compression fitting cannot be repositioned on the thermowell after loosening.

Note:

• Thread means that the thermometer can be exchanged in the process.
• Fully adjustable immersion length on initial installation
• Max. Temp. 316/1.4401: 500 °C

Gas tight adjustable threaded bush for high temperature thermocouples

Note:

• Thread means that the thermometer can be exchanged in the process
• Fully adjustable immersion length
• Highest temperature 350 °C for all versions, material SS 316Ti.
• Maximum process pressure 1 bar.

Flange

Flanges offer the process connectionsch of field devices. They are subject to the EN, AMSE or JIS  standards and are divided by material, nominal diameters, seal face and nominal pressure ranges. In order to cover all the various types of process conditions a large number of sealing possibilities are available:

Tongue and groove flange
In this flange version the tongue fits into the groove thus fixing the flange position.
Hint:
Please note that the Form F must be defined as a raised face according to the new EN Standard!

Male/ female raised face flanges
In this sealing concept the male raised face fits into the female rebate thus fixing the flange position. In this case the raised face offers a greater sealing area than the tongue version.

Flat faced flange
Due to the flat face a larger flange area is made available and a wider gasket can be used to ensure better sealing.

Gasket guide flange
With guide means that the gasket surface is raised
Hint
Please note that the Form C and D must be defined as tongue and groove according to the new EN Standard! Form E must be defined as male raised face acdording to the new EN-Standard!

Flange for high temperature thermocouples

Highest temperature 350 °C, material aluminum. No gas tight connection. Selection in the order code.

Flange outer diameter 70mm

Thermometer fixing via side mounted clamping screw.

Highest temperature 400 °C, material cast iron. No gas tight connection. Matching flange and gasket not delivered. Must be added to the order structure as a special option.
(1) Internal diameter 16, 23, 33mm
(2)/(3) Hole spacing 55/70mm; Flange external measurement 70/90mm

 Material availability guide
 

Material

Composition

Max temperature

Application

304SS

18% Chromium

650 °C (800 °C pressureless in air)

Offers excellent restistance to many corrosive agents encountered in domestic and industrial use.

310SS

25% Chromium

1150 °C

Good resistance to oxidation at temperatures up to 1150 °C. Good resistance to thermal fatigue and cyclic heating.

316SS

17% Chromium
12% Nickel
2-3% Molybdenum

650 °C (800 °C pressureless in air)

Good resistance to a much larger range of chemicals than 304SS. Withstands sulphurous acid compounds.

321SS

Similar to 304SS but Steel stabilized by Titanium addition

650 °C (800 °C pressureless in air)

Not sensitive to intergranular corrosion when heated within the carbide precipitation range of 482 °C to 800 °C. Similar to 304SS in corrosion resistance.

347SS

Similar to 304SS but contains Tantalum and is Steel stabilized by Columbium addition

650 °C (800 °C pressureless in air)

Exactly equivalent to 304SS for 426 °C to 800 °C range. Superior to 321SS where service is both corrosive and at an elevated temperature.

304LSS/316LSS

Similar to 304SS and 316SS but with reduced carbon (low carbon)

650 °C (800 °C pressureless in air)

Low carbon versions of 304SS and 316SS (maximum of 0.03% carbon). Because of low carbon content the effects of carbide precipitation are reduced.

Inconel 600

76% Nickel

1100 °C

Excellent material for severely corrosive environments. Resistant to oxidation at temperatures up to 1100 °C. Excellent for cement plants.

Inconel 601

60.5% Nickel
23.0 Chromium
1.5 Aluminum

1100 °C

Similar to Inconel 600 however higher Chromium content gives superior resistance to oxidizing, carburizing and sulphur containing environments.

Incoloy 800

32.5% Nickel
46% Iron
21% Chromium

1100 °C

Resistant to oxidation and carburization at elevated temperatures. It resists stress-corrosion cracking, sulphur attack, internal oxidation, scaling and corrosion in a wide variety of indstrial atmospheres. Sulphurous applications.

Monel 400

66% Nickel
31% Copper

550 °C

Highly resistant to corrosion by chlorinated solvents, glass etching agents, Sulphuric and many other acids and practically all alkalies generally free from stress-corrosion cracking. Good resistant to salt water corrosion. Desalination plants.

Hastelloy B

61% Nickel
28% Molybdenum

1100 °C

Good corrosion resistance to hydrochloric, sulphuric, phosphoric and acetic acids. Excellent corrosion resistance to hydrogen-chloride gas.

Hastelloy C

54% Nickel
16% Molybdenum
15.5% Chromium
4% Tungsten

1100 °C

Good corrosion resistance to many chemical environments, including ferric and cupric chlorides, contaminated mineral acids, wet chlorine gas. Oxidation resistance to 1100 °C.

Hastelloy X

47% Nickel
9% Molybdenum
22% Chromium
0.5% Tungsten

1100 °C

Good high temperature strength and resistance to oxidation to 1100 °C. Also good for reducing conditions.

F11 chrom moly

0.5% Molybdenum
1.25% Chromium

550 °C (650 °C pressureless in air)

High strength steels used in pressure vessels and industrial boilers. Resistant to cleaning agents, chloroform, food products and carbon disulphide. The chrom moly is generally matched to the pipe grade for optimized welds.

F22

1.0% Molybdenum
2.25% Chromium

600 °C

High strength steels used in pressure vessels and industrial boilers. Resistant to cleaning agents, chloroform, food products and carbon disulphide. F22 has a higher tensile strength than F11. The chrom moly is generally matched to the pipe grade for optimized welds.

F91

1.0% Molybdenum
9.0% Chromium

600 °C

High strength steels used in pressure vessels and industrial boilers. Resistant to cleaning agents, chloroform, food products, carbon disulphide. F91 has one of the highest available tensile strengths for chrom moly steels. The chrom moly is generally matched to the pipe grade for optimized welds.

HR160

29% Cobalt
28% Chromium
max. 2% Iron
2.75% Silicon

1200 °C

A high temperature alloy with outstanding resistance to high temperature corrosion. It has excellent resistance to sulphidation and chloride attack in both reducing and oxidizing atmospheres. Its resistance to attack by the products of combustion of low grade fuels makes it VERY useful in municipal, industrial, hazardous and nuclear waste incinerators.

Titanium

Ti metal

600 °C

Excellent resistance to oxidizing acids such as nitric or chromic. It is also resistant to inorganic chloride solutions, chlorinated organic compounds and moist chlorine gas. Its good resistance to seawater and salt spray allows it to be used in offshore installations.

Duplex stainless steel 2205

4.5% Nickel

300 °C

These grades combine high strength with excellent corrosion resistance, especially to chloride stress corrosion cracking. However a tendency to brittleness limits their use to approx. 300 to 315 °C maximum. Sub-zero use is also restricted because of brittleness due to ferrite content. Offshore pipelines are the main applications.