Thermocouple
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LUDWIG SCHNEIDER

TABLE OF CONTENTS HOW TO ORDER ELECTRICAL TEMPERATURE MEASUREMENT WITH THERMOCOUPLES Temperature Temperature scale Thermoelectric effect Standards for thermocouples Measuring inserts Thermowell THERMOCOUPLES ACC. TO DIN 43772 FORM 1-4 TE-BA TE-BE TE-BB-ko TE-BB-k TE-BB TE-BC TE-BF TE-BE (R) TE-BB (R) TE-BC (R) TE-BF (R) TE-BD THERMOCOUPLES WITHOUT ADDITIONAL THERMOWELL TE-BL-ME 40 MEASURING INSERTS FOR THERMOCOUPLES ACC. TO DIN 43735 BASIC VALUES DEVIATION LIMITS

In addition to the meter, kilogram, second, mole, candela and ampere, the temperature is a basic unit within the metric system of units (SI) and is represented by the formula sign T. In addition to the temperature scale to Kelvin, measurement in degrees Celsius is very common. The following correlation exists between the two units: 0 K = –273.15 °C All thermocouples in this catalogue are exactly described in their technical execution and correspond to valid standards and prescribed manufacturing methods. All thermocouples in standard design have an own catalogue number, which is sufficient...

The functional principle is based on the effect described by Seebeck in 1821 that a current flow arises when two metal conductors made of different materials are connected with each other and a temperature change takes place at a connection point. The connected conductors are designated as thermocouples and the physical process is defined as the thermoelectric effect. The thermoelectric voltage, meaning the voltage at the thermocouple, increases as the temperature increases. Thermocouples have some advantages compared to resistance thermometers: Smaller construction forms are possible, they...

Put generally, the thermoelectric voltage/K is higher, the greater the difference in the metals of both legs is. Of the thermocouples listed, the NiCr/CuNi element (Type E) has the highest electromotive force (EMF). By contrast, the thermocouple Pt30Rh/Pt6Rh (Type B) has the lowest EMF, since the two thermo-legs differ only in the rhodium alloy content. The thermoelectric voltages as a factor of the temperature were calculated as the basic values and defined in the standards IEC 584 or EN 60584 respectively. These values all reference a reference junction temperature of zero degrees...

DEVIATION LIMITS ACC. TO IEC 751 RESP. DIN EN 60751 According to EN 60584 thermocouples are divided into three tolerance classes. These reference thermoelectric wires with a 0 0.25 to 3 mm and refer to the state of delivery. Possible aging during operation cannot be taken into consideration, since these are application-specific. The specified temperature ranges do no contain any limits for the application. These are ranges within which the described tolerances are defined. DEVIATION LIMITS ACC. TO DIN EN 60584 Type SUMMARY OF THERMOWELL AND INSERTS TE-BA

TE-BA INSERTIBLE THERMOCOUPLE ACC. TO DIN 43772 FORM 1, WITH EXCHANGEABLE INSERT SPARE INSERTS AT BENDABLE DESIGN SPECIFICATION: + Measuring insert with mineral insulated sheathed cable (bendable) at stainless steel + Temperature range -100 °C to 600 °C COMPLETE INSTRUMENTS SPECIFICATION OF THE STANDARD DESIGN: + Connection head Type B at light metal with cable gland M 20 x 1,5 (acc. to DIN EN 50446) + Thermowell at stainless steel 1.4571 + Thermowell 0 and nominal length according to table + Measuring insert with mineral insulated sheathed cable (bendable) stainless steel sheath with...

SPARE INSERTS AT BENDABLE DESIGN SPECIFICATION: + Measuring insert with mineral insulated sheathed cable (bendable) at stainless steel + Temperature range -100 °C to 600 °C COMPLETE INSTRUMENTS SPECIFICATION OF THE STANDARD DESIGN: + Connection head Type B at light metal with cable gland M 20 x 1,5 (acc. to DIN EN 50446) + Thermowell at stainless steel 1.4571 + Thermowell 0 and nominal length according to table + Measuring insert with mineral insulated sheathed cable (bendable) stainless steel sheath with constant diameter + Thermocouple NiCr-Ni (Type K) or Fe-CuNi (Type J); simplex or...

TE-BB-ko SCREW-IN THERMOCOUPLE SIMILAR DIN 43772 FORM 2G, INSERT NOT EXCHANGEABLE COMPLETE INSTRUMENTS SPECIFICATION OF THE STANDARD DESIGN: + Connection head type B at light metal with cable gland M 20 x 1,5 (acc. to DIN EN 50446) + Thermowell at stainless steel 1.4571 + Mounting bush G 1/2 at stainless steel 1.4571 + Immersion length EL and thermowell 0 acc. to table + Thermocouple NiCr-Ni (Type K) or Fe-CuNi (Type J); simplex or duplex Tolerance acc. to DIN EN 60584 class 2 + Measuring point insulated + Connection via ceramic terminal block with connection pins + Range -100 °C to 600 °C...

SPARE INSERTS AT BENDABLE DESIGN SPECIFICATION: + Measuring insert with mineral insulated sheathed cable (bendable) at stainless steel + Temperature range -100 °C to 600 °C COMPLETE INSTRUMENTS SPECIFICATION OF THE STANDARD DESIGN: + Connection head Type B at light metal with cable gland M 20 x 1,5 (acc. to DIN EN 50446) + Thermowell at stainless steel 1.4571 + Mounting bush G 1/2 at stainless steel 1.4571 + Immersion length EL and thermowell 0 acc. to table + Measuring insert with mineral insulated sheathed cable (bendable) stainless steel sheath with constant diameter + Thermocouple...

SPARE INSERTS AT BENDABLE DESIGN SPECIFICATION: + Measuring insert with mineral insulated sheathed cable (bendable) at stainless steel + Temperature range -100 °C to 600 °C COMPLETE INSTRUMENTS SPECIFICATION OF THE STANDARD DESIGN: + Connection head Type B at light metal with cable gland M 20 x 1,5 (acc. to DIN EN 50446) + Thermowell and neck tube at stainless steel 1.4571 + Mounting bush G 1/2 at stainless steel 1.4571 + Immersion length EL and thermowell/neck tube 0 acc. to table + Neck tube length HL = 145 mm + Measuring insert with mineral insulated sheathed cable (bendable) stainless...

SPARE INSERTS AT BENDABLE DESIGN SPECIFICATION: + Measuring insert with mineral insulated sheathed cable (bendable) at stainless steel + Temperature range -100 °C to 600 °C COMPLETE INSTRUMENTS SPECIFICATION OF THE STANDARD DESIGN: + Connection head Type B at light metal with cable gland M 20 x 1,5 (acc. to DIN EN 50446) + Thermowell and neck tube at stainless steel 1.4571 + Mounting bush G 1 at stainless steel 1.4571 + Immersion length EL and thermowell/neck tube 0 acc. to table + Neck tube length HL = 145 mm + Measuring insert with mineral insulated sheathed cable (bendable) stainless...