Resistance thermometers
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RESISTANCE THERMOMETERS

TABLE OF CONTENTS HOW TO ORDER METHOD OF FUNCTIONING AND CONSTRUCTION OF RESISTANCE THERMOMETERS Standard for measuring resistors 5 Circuit diagrams and colour coding 9 SUMMARY OF RESISTANCE THERMOMETERS AND INSERTS 10 BASIC VALUES ACC. TO IEC 751 RESP. DIN EN 60751 11 DEVIATION LIMITS ACC. TO IEC 751 RESP. DIN EN 60751 14 RESISTANCE THERMOMETERS ACC. TO DIN 43772 FORM 1 - 4 WT-BA 16 AIR-DUCT RESISTANCE THERMOMETERS WT-BB-k perf. 44 RESISTANCE THERMOMETERS WITHOUT ADDITIONAL THERMOWELL WT-BL-ME 48 MEASURING INSERTS FOR RESISTANCE THERMOMETERS ACC. TO DIN 43735 WT-ME 52

HOW TO ORDER All resistance thermometers in this catalogue are exactly described in their technical execution and correspond to valid standards and prescribed manufacturing methods. All resistance thermometers in standard design have an own catalogue number, which is sufficient for your order specification. Under the point ”options” you will find additional numbers, with which you can modify the resistance thermometers. These additional numbers are to be appended to the catalogue numbers of the standard design, whereat no sequence must be considered. EXAMPLE 1 : Order of a resistance...

NOMINAL VALUE The nominal value in a measuring resistor is the value in Ohm which it has at 0 °C. The term Pt is used for platinum measuring resistor. This means that: a measuring resistor Pt100 has 100 Q at 0 °C, a measuring resistor Pt500 has 500 Q at 0 °C, a measuring resistor Pt1000 has 1000 Q at 0 °C. CONNECTING TECHNIQUES 2-WIRE CONNECTION The resistance thermometer is connected to the display or to the measured value logger by means of a 2-core connecting lead. This alternative is the simplest but also most inaccurate connecting technique, because the additional resistance of the...

CIRCUIT DIAGRAMS AND COLOUR CODING Resistance thermometers are nowadays produced and used in innumerable designs. A resistance thermometer basically consists of a measuring resistor, appropriate housing and the required means of connection. Only a very small part of these construction types are defined by standard DIN 43772, in which components and dimensions are specified. These standardised resistance thermometers always consist of a connection head, a thermowell and a exchangeable measuring insert, and can be assembled as modules. In standard DIN EN 50446, the connection heads are...

BASIC VALUES ACC. TO IEC 751 RESP. DIN EN 60751 SUMMARY OF RESISTANCE THERMOMETERS AND INSERTS DIN 43772 form 1 DIN 43772 form 2 DIN 43772 form 2G DIN 43772 form 2G DIN 43772 form 2G Page 16 Page 18 Page 20 Page 22 Page 24 DIN 43772 form 2G DIN 43772 form 2F DIN 43772 form 3 DIN 43772 form 3G DIN 43772 form 3G Page 26 Page 28 Page 30 Page 32 Page 34 The basic values are standardized for the measuring resistor Pt100 and listed in steps of 1 °C. The values are specified in Ohm and calculated in accordance with the International Temperature Scale ITS 90. The basic values are defined for the...

The deviation limits for class B, A and AA are standardized for the measuring resistor Pt100. The deviation limits for the narrower tolerance classes 1/5 B and 1/10 B are defined by us. The values are calculated and specified in Ohm and °C.

WT-BA INSERTIBLE RESISTANCE THERMOMETER ACC. TO DIN 43772 FORM 1, WITH EXCHANGEABLE INSERT SPARE INSERTS AT STANDARD DESIGN SPECIFICATION: + See the standard design 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 + Nominal length NL acc. to table + Insert with rigid protection tube at stainless steel (acc. to DIN 43735) + Resistor 1x Pt100 or 2x Pt100 acc. to DIN EN 60751 class B (ceramic resistor with bifilary wire winding) + 2-, 3- or 4-wire...

SPARE INSERTS AT STANDARD DESIGN SPECIFICATION: + See the standard design 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 + Nominal length NL acc. to table + Insert with rigid protection tube at stainless steel (acc. to DIN 43735) + Resistor 1x Pt100 or 2x Pt100 acc. to DIN EN 60751 class B (ceramic resistor with bifilary wire winding) + 2-, 3- or 4-wire connection + Connection via ceramic terminal block with connection pins + Range -100 °C to 500 °C...

WT-BB-ko SCREW-IN RESISTANCE THERMOMETER 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 (BSP) at stainless steel 1.4571 + Immersion length EL acc. to table + Resistor 1x Pt100 or 2x Pt100 acc. to DIN EN 60751 class B (ceramic resistor with bifilary wire winding) + 2-, 3- or 4-wire connection + Connection via ceramic terminal block with connection pins + Range -100 °C to 500 °C...

SPARE INSERTS AT STANDARD DESIGN SPECIFICATION: + See the standard design 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 (BSP) at stainless steel 1.4571 + Immersion length EL acc. to table + Insert with rigid protection tube at stainless steel (acc. to DIN 43735) + Resistor 1x Pt100 or 2x Pt100 acc. to DIN EN 60751 class B (ceramic resistor with bifilary wire winding) + 2-, 3- or 4-wire connection + Connection via ceramic...

SPARE INSERTS AT STANDARD DESIGN SPECIFICATION: + See the standard design 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 (BSP) at stainless steel 1.4571 + Immersion length EL acc. to table + Lagging tube length HL = 145 mm + Insert with rigid protection tube at stainless steel (acc. to DIN 43735) + Resistor 1x Pt100 or 2x Pt100 acc. to DIN EN 60751 class B (ceramic resistor with bifilary wire winding) + 2-, 3- or 4-wire...