B57227K_09

NTC thermistors for temperature measurement Probe assemblies Series/Type: Date: B57227K 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 Probe assemblies B57227K K227 Applications Electric motors Transformers Features Coated thermistor disk with shrunk sleeve insulation PTFE-insulated wires, AWG 26 UL approval (E69802) Options Alternative resistance ratings, rated temperatures, resistance tolerances and wire lengths available on request. Delivery mode Bulk General technical data Climatic category Max. power Resistance tolerance Rated temperature Dissipation factor Thermal cooling time constant Heat capacity Insulation resistance Test voltage (IEC 60068-1) (at 25 °C) Dimensional drawing Dimensions in mm Approx. weight 5 g (in air) (in air) (V = 100 V DC) (t = 1 s) P25 ∆RR/RR TR δth τc Cth Rins Vtest 55/155/56 200 ±10 100 approx. 5 approx. 30 approx. 150 > 100 2.5 mW % °C mW/K s mJ/K MΩ kV AC Electrical specification and ordering codes R100 Ω 1.8 k R25 Ω 32762 No. of R/T characteristic 2904 B25/100 K 4300 ±3% Ordering code B57227K0333A001 Please read Cautions and warnings and Important notes at the end of this document. Page 2 of 9 Temperature measurement Probe assemblies B57227K K227 Reliability data Test Storage in dry heat Standard IEC 60068-2-2 Test conditions ∆R25/R25 (typical) < 2% Remarks No visible damage Storage in damp heat, steady state Rapid temperature cycling Endurance Long-term stability (empirical value) Storage at upper category temperature T: 155 °C t: 1000 h IEC Temperature of air: 40 °C 60068-2-78 Relative humidity of air: 93% Duration: 56 days IEC Lower test temperature: 55 °C 60068-2-14 Upper test temperature: 155 °C Number of cycles: 10 Pmax: 200 mW t: 1000 h Temperature: 100 °C t: 10000 h < 1% No visible damage No visible damage No visible damage No visible damage < 1% < 2% < 3% Please read Cautions and warnings and Important notes at the end of this document. Page 3 of 9 Temperature measurement Probe assemblies B57227K K227 R/T characteristics R/T No. 2904 T (°C) B25/100 = 4300 K T (°C) RT/R25 α (%/K) 55.0 50.0 45.0 40.0 35.0 30.0 25.0 20.0 15.0 10.0 5.0 0.0 5.0 10.0 15.0 121.46 84.439 59.243 41.938 29.947 21.567 15.641 11.466 8.451 6.2927 4.7077 3.5563 2.7119 2.086 1.6204 7.4 7.2 7.1 6.9 6.7 6.6 6.3 6.2 6.0 5.9 5.7 5.5 5.3 5.1 5.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0 65.0 70.0 75.0 80.0 85.0 90.0 B25/100 = 4300 K T (°C) RT/R25 α (%/K) 1.2683 1.0000 0.7942 0.63268 0.5074 0.41026 0.33363 0.27243 0.2237 0.18459 0.15305 0.12755 0.10677 0.089928 0.076068 4.8 4.7 4.6 4.5 4.3 4.2 4.1 4.0 3.9 3.8 3.7 3.6 3.5 3.4 3.3 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 B25/100 = 4300 K RT/R25 α (%/K) 0.064524 0.054941 0.047003 0.040358 0.034743 0.030007 0.026006 0.022609 0.01972 0.017251 0.015139 0.013321 0.011754 3.3 3.2 3.1 3.0 3.0 2.9 2.8 2.8 2.7 2.6 2.6 2.5 2.5 Please read Cautions and warnings and Important notes at the end of this document. Page 4 of 9 Temperature measurement Probe assemblies B57227K K227 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,