Endress+Hauser TWF11, TWF16 Specifications

Technical Information

TWF11, TWF16

Metal or ceramic thermowells For high temperature assemblies TAF11 and TAF16 Adjustable process connection

Application

TWF11

• Applicable for steel treatment (annealing), concrete furnaces and primaries. Accessory for high temperature assembly TAF11.

TWF16

• Applicable for cement production, steel treatment, incinerators and fluidized bed furnaces. Accessory for high temperature assembly TAF16.

Process temperatures:

• TWF11 up to +1600 °C (+2912 °F)

• TWF16 up to +1700 °C (+3092 °F)

Your benefits

• Long lifetime by usage of innovative thermowell materials with increased wear and chemical resistance

• Long term stable measurement due to sensor protection with non-porous materials

• Replaceable parts

TI01015T/09/en 71131970

TWF11, TWF16

Performance characteristics

Operating conditions Process temperature

Depends on material, details see section ’Material’.

Process pressure

Depends on material. Thermowells in high temperature applications are generally designed for use in pressureless processes. Available process connections can be gastight up to 1 bar, details  ä 5.

Permitted flow rate as a function of immersion length

Depends on material and application. For process pressures  1 bar and a flow rate 1 m/s it is recommended to order a thermowell stress calculation, please contact your nearest Endress+Hauser sales organisation.

Material 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. Endress+Hauser supplies DIN/EN threaded process connections and flanges made of stainless steel according to AISI 316L (DIN/EN material number 1.4404 or 1.4435). With regard to their temperature stability properties, the materials 1.4404 and 1.4435 are grouped under 13E0 in EN 1092-1 Tab. 18. The chemical composition of the two materials can be identical.

Material name Short form Recommended

max. temperature for continuous use in air

AISI 316L/

1.4404

1.4435

AISI 310/

1.4841

AISI 304/

1.4301

AISI 446/ ~1.4762/ ~1.4749

INCONEL / 2.4816

INCONEL / 2.4851

X2CrNiMo17-12-2 X2CrNiMo18-14-3

X15CrNiSi25-20 1100 °C (2012 °F) • Austenitic, stainless steel

X5CrNi18-10 850 °C (1562 °F) • Austenitic, stainless steel

X10CrAl24 / X18CrNi24

600

NiCr15Fe 1100 °C (2012 °F) • A nickel/chromium alloy with very good resistance to aggressive, oxidizing and reducing

601

NiCr23Fe 1200 °C (2192 °F) • High temperature corrosion resistance enhanced by aluminum content

650 °C (1200 °F)

1100 °C (2012 °F) • A ferritic, heat resistant, high-chromium stainless steel

Properties

• Austenitic, stainless steel

• 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

• Compared to 1.4404, 1.4435 has even higher corrosion resistance and a lower delta ferrite content

• Good resistance to oxidizing and reducing atmospheres

• Due to the higher chromium content well resistant to oxidizing aqueous solution and neutral salts melting at higher temperatures

• Only weakly resistant to sulphurous gases

• Well usable in water and lowly pollute waste water

• Only at relatively low temperatures resistant to organic acids, saline solutions, sulphates, alcaline solutions, etc.

• Very high resistance to reducing sulphurous gases and salts with low content of oxygen

• Very good resistance to constant as well as cyclical thermal stress, to incineration ash-corrosion and to melts of copper, lead and tin

• Poorly resistant to gases containing nitrogen

atmospheres, even at high temperatures

• Resistant to corrosion caused by chlorine gas and chlorinated media as well as many oxidizing mineral and organic acids, sea water etc.

• Corrodible by ultrapure water

• Not to be used in a sulfur-containing atmosphere

• Resistance to oxide spalling and carburization under thermal cycling

• Good resistance against molten salt corrosion

• Particularly susceptible to sulfidation

2 Endress+Hauser

TWF11, TWF16

Material name Short form Recommended

Properties max. temperature for continuous use in air

INCOLOY®800 HT / 1.4959

X8NiCrAlTi32-21 1100 °C (2012 °F) • A nickel/chromium/iron alloy based on the same composition as INCOLOY®800, but has

significantly higher creep rupture strength, resultant from the close control of the carbon, aluminum and titatinium contents.

• Good strength and excellent resistance to oxidation and carburization at high temperature environments.

• Good resistance to stress corrosion cracking, attack by sulfur, internal oxidation, scaling and corrosion in a multitude of industrial environments. Suitable for sulfurous environments.

HASTELLOY / 2.4665

NiCr22Fe18Mo 1150 °C (2102 °F) • A nickel/chromium/iron/molybdenum alloy

• Very resistant to oxidizing and reducing atmospheres

• Good strength and ductility at high temperatures

Kanthal AF FeCrAl 1400 °C (2552 °F) • A high-temperature ferritic iron/chrominum/aluminum alloy

• High resistance to sulfurous, carburizing and oxidising environments

• Good hardness and weldability

• Good form stability at high temperature

• Not to be used in a chloride-containing atmosphere and nitrogenous gases (cracked ammonia)

Special nickel/ cobalt alloy

NiCo 1200 °C (2192 °F) • A nickel/cobalt alloy

• Very good resistance to sulfidation and chloride environment

• Exceptionally good resistance to oxidation, hot corrosion, carburization, metal dusting, and nitridation

• Good creep resistance

• Average surface hardness

• High wear resistance

Recommended applications

• Cement industry – gas standpipe: successfully tested with up to 20 times longer lifespan compared to AISI310 – clincker cooler: successfully tested with up to 5 times longer lifespan compared to AISI310

• Waste incinerators: successfully tested with up to 12 times longer lifespan than INCONEL and C276)

• Fluidized bed furnace (biogas reactor): successfully tested with up to 5 times longer lifespan than e.g. INCOLOY

800HT or INCONEL® 600.

Ceramic material types according to DIN VDE0335

C610 1500 °C (2732 °F) • Al

-content approx. 60 %, alkali-content 3 %

2O3

• The most economic non porous ceramic material

• Highly resistant to hydrogen fluoride, temperature shocks and mechanical influences, normally used for internal and external thermowells as well as insulators

Sinterized silicon carbide

SiC 1650 °C (3000 °F) • High thermal shock resistance due to its porosity

• Good thermal conductivity

• Very hard and stable at high temperature

Recommended applications

• Glass industry: glass feeders, float glass production

• Ceramic industry

• Furnaces

Kanthal Super MoSi

with a glass

phase component

1700 °C (3092 °F) • It is not affected by thermal shock

• Very low porosity (< 1%) and very high hardness

• Not to be used in environments with chlorine and fluorine compounds

• Not suitable for mechanical shock affected applications

• Not to be used in applications with powder

Special silicon nitride ceramic

SiN 1400 °C (2552 °F) • Excellent wear and thermal shock resistance

• No porosity

• Good heat response

• Not resistant to impacts (brittleness)

Recommended applications

• Cement industry – Cyclone preheater: successfully tested with up to 5 times longer lifespan compared to AISI310 – Secondary airpipe

• Generally all applications with extreme abrasive conditions; mechanical shocks/impacts have to be avoided because of brittleness

600

1) Can be used to a limited extent up to 800 °C (1472 °F) for low compressive loads and in non-corrosive media. Please contact your Endress+Hauser sales team for further information.

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