NTC thermistors for temperature measurement Probe assemblies Series/Type: B57020M2 Date: February 2009 © EPCOS AG 2009. Reproduction, publication and dissemination of this publication, enclosures hereto and the information contained therein without EPCOS' prior express consent is prohibited.
Temperature measurement B57020M2 Probe assemblies M2020 Applications Cabinet and evaporator in refrigerators and deep freezers Dimensional drawing Features Thermistor in molded plastic case with cable outlet Highly resistant to water/moisture PVC-insulated connecting cable (white) Conductor cross section: 2 × 0.
Temperature measurement B57020M2 Probe assemblies M2020 Reliability data Test Standard Storage in dry heat IEC 60068-2-2 Test conditions Storage at upper category temperature T: 80 °C t: 1000 h Storage in damp IEC Temperature of air: 40 °C heat, steady state 60068-2-78 Relative humidity of air: 93% Duration: 56 days Storage in coldness Storage at lower category temperature T: 40 °C t: 1000 h Rapid temperature IEC Lower test temperature: 40 °C cycling (in air) 60068-2-14 Upper test temperature: 80
Temperature measurement B57020M2 Probe assemblies M2020 R/T characteristics R/T No. 2003 T (°C) B25/100 = 3980 K T (°C) RT/R25 α (%/K) B25/100 = 3980 K T (°C) RT/R25 α (%/K) B25/100 = 3980 K RT/R25 α (%/K) 55.0 50.0 45.0 40.0 35.0 97.578 67.65 47.538 33.831 24.359 7.5 7.2 7.0 6.7 6.5 20.0 25.0 30.0 35.0 40.0 1.2492 1.0000 0.80575 0.65326 0.5329 4.5 4.4 4.3 4.1 4.0 95.0 100.0 105.0 110.0 115.0 0.079225 0.068356 0.059247 0.051531 0.044921 3.0 2.9 2.8 2.8 2.7 30.0 25.0 20.0 15.0 10.
Temperature measurement B57020M2 Probe assemblies M2020 Cautions and warnings General See "Important notes" at the end of this document. Storage Store thermistors only in original packaging. Do not open the package prior to storage. Storage conditions in original packaging: storage temperature 25 °C ... +45 °C, relative humidity ≤75% annual mean, <95% maximum 30 days per annum, dew precipitation is inadmissible. Do not store thermistors where they are exposed to heat or direct sunlight.
Temperature measurement B57020M2 Probe assemblies M2020 Mounting Ensure that no thermo-mechanical stress occurs due to production processes (curing or overmolding processes) when thermistors are sealed, potted or overmolded or during their subsequent operation. The maximum temperature of the thermistor must not be exceeded. Ensure that the materials used (sealing/potting compound and plastic material) are chemically neutral.
Temperature measurement B57020M2 Probe assemblies M2020 Symbols and terms Symbol English German A AWG Area American Wire Gauge Fläche Amerikanische Norm für Drahtquerschnitte B B25/100 B value B value determined by resistance measurement at 25 °C and 100 °C B-Wert B-Wert, ermittelt durch Widerstandsmessungen bei 25 °C und 100 °C Cth Heat capacitance Wärmekapazität I Current Strom N Number (integer) Anzahl (ganzzahliger Wert) P25 Pdiss Pel Pmax Maximum power at 25 °C Power dissipation
Temperature measurement B57020M2 Probe assemblies M2020 Symbol English German α Temperature coefficient Temperaturkoeffizient ∆ Tolerance, change Toleranz, Änderung δth Dissipation factor Wärmeleitwert τc τa Thermal cooling time constant Thermal time constant Thermische Abkühlzeitkonstante Thermische Zeitkonstante Abbreviations / Notes Symbol English German Surface-mounted devices Oberflächenmontierbares Bauelement * To be replaced by a number in ordering Platzhalter für Zahl im Bes
Important notes The following applies to all products named in this publication: 1. Some parts of this publication contain statements about the suitability of our products for certain areas of application. These statements are based on our knowledge of typical requirements that are often placed on our products in the areas of application concerned.
