Omnigrad S TAF11

Summary

Product Identification

Model Series: Omnigrad S Assembly Types: TAF11, TAF12x, TAF16 Description: High temperature assemblies with metal or ceramic protection tubes and adjustable process connection.

Application Areas

• TAF11: Steel treatment (annealing), concrete furnaces, and primaries. Features a single or double TC insert and a ceramic protection tube.
• TAF12x (S/D/T): Ceramic baking ovens, brickworks, porcelain production, and glass industries. Features single/double/triple ceramic protection tubes and single or double TC inserts in ceramic insulators.
• TAF16: Cement production, steel treatment, incinerators, and fluidized bed furnaces. Features a single or double TC insert and a metal or ceramic protection tube.

Operating Limits

• TAF11 Process Temperature: Up to +1600 °C (+2912 °F)
• TAF12 Process Temperature: Up to +1700 °C (+3092 °F)
• TAF16 Process Temperature: Up to +1700 °C (+3092 °F)
• Process Pressure: Generally designed for pressureless processes. Gas-tight process connections are available up to 1 bar. For pressures ≥ 1 bar and flow rates ≥ 1 m/s, a protection tube stress calculation is recommended.

Measuring Principle

The devices utilize thermocouples, which function based on the Seebeck effect. When two dissimilar electrical conductors are joined, a thermoelectric voltage (emf.) is generated due to a temperature difference. This voltage is proportional to the temperature difference between the measuring junction and the cold junction. The magnitude of the voltage depends on the conductor materials and the temperature gradient. Absolute temperature is determined by knowing or measuring the cold junction temperature. Thermocouple types (J, K, N, R, S, B) are standardized by IEC 60584 and ASTM E230/ANSI MC96.1.

Measuring Inserts

• TPC100: Insert with MgO insulation and metallic sheath. Available for TC types J, K, and N.
• TPC200: Insert with segmented ceramic insulation or ceramic insulation. Available for TC types J, K, B, R, and S.

Protection Tube Materials

• Metallic Protection Tubes: Generally offer higher mechanical resistance but have lower maximum temperature limits and less abrasion resistance. They are non-porous. Materials include AISI 316L/1.4404/1.4435, AISI 310/1.4841, AISI 304/1.4301, AISI 446/~1.4762/~1.4749, INCONEL® 600/2.4816, INCONEL® 601/2.4851, INCOLOY® 800 HT/1.4959, Kanthal AF (FeCrAl), and NiCo (Special nickel/cobalt alloy).
• Ceramic Protection Tubes: Commonly used for the highest temperatures and applications with high abrasion rates due to their hardness. Materials include C530, C610, C799, Sinterized silicon carbide (SiC), Kanthal Super (MoSi2), and SiN (Special silicon nitride ceramic). Attention must be paid to their brittleness under high mechanical loads.

Process Connections

Available types include:

• Adjustable flange
• Stop flange according to DIN EN 50446
• Gas-tight GCP assembly (up to 1 bar)

Electrical

• Thermocouple Types: J, K, N, R, S, B
• Input: Thermocouples (TC) as per IEC 60584
• Transmitters: Compatible with iTEMP® transmitters (PC programmable, HART®, PROFIBUS® PA, FOUNDATION Fieldbus™).
• Cold Junction Compensation: Internal cold junction (Pt100) with accuracy of ±1 K.

Mechanical / Hydraulic

• Terminal Heads: TA30A, TA30D, DIN A. Protection class IP66/68 (NEMA Type 4x encl.). Max. temperature for TA30A/TA30D is -50 to +150 °C (-58 to +302 °F). Max. temperature for DIN A is 130 °C (266 °F).
• Weight: Varies from 2 to 3 kg (4.4 to 6.6 lbs) depending on version.
• Installation: Vertical and horizontal installation are possible. Vertical installation is preferred. Maximum immersion lengths are specified for horizontal mounting.
• Ceramic Sheath Installation: Requires pre-heating for gas-tight ceramic sheaths at process temperatures ≥ 1000 °C (1832 °F) to prevent thermal shock.

Accuracy

Permissible deviation limits of thermoelectric voltages from the standard characteristic are defined for thermocouples as per IEC 60584, with "Standard tolerance" (Class 2) and "Special tolerance" (Class 1) available.

Response Time

Response time (t50, t90) varies by assembly configuration. For example, the TAF12T with a triple ceramic protection tube (material C530+C610) has t50 of 195 s and t90 of 500 s for a fast temperature change from 1000 °C (1832 °F) to room temperature in stationary air.

Insulation Resistance

• ≥ 1000 MΩ at 25 °C (77 °F)
• ≥ 5 MΩ at 500 °C (932 °F) (measured with 500 V DC)

Calibration

Factory calibration is performed according to an internal procedure traceable to national and international standards. Calibration can be performed on the replaceable insert or the entire thermometer if it is not replaceable.

Materials

A variety of metallic and ceramic materials are available for protection tubes and other components, each with specific temperature limits and resistance properties. See the datasheet for detailed material properties.

Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror