NTC thermistors for temperature measurement Glass-encapsulated sensors with insulation Series/Type: B57551G, B57551G1 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 B57551G, B57551G1 Glass-encapsulated sensors with insulation G551/G1551 Applications Dimensional drawing Temperature measurement Features Glass-encapsulated NTC thermistor, heat-resistant and highly stable Coating of glass body and leads for electrical insulation For temperature measurement up to 260 C Short response time Small dimensions Leads: dumet wires (copper-clad FeNi) Options Dimensions in mm Leads: nickel-plated dumet wires Alternative dimensions available on request Delivery mode Bulk General technical data Climatic category (IEC 60068-1) 55/260/56 Max. power (at 25 C) P 32 mW 25 Resistance tolerance R /R 1, 2, 3 % R R Rated temperature T 25 C R Dissipation factor (in air) approx. 0.8 mW/K th Thermal cooling time constant (in air) approx. 9 s c Heat capacity C approx. 7.2 mJ/K th 1) Insulation resistance (V = 100 V DC) R 100 M ins 1) Test voltage (t = 1 s) V 500 V DC test 1) Medium: NaCl-solution Temperature: Room temperature Please read Cautions and warnings and Page 2 of 15 Important notes at the end of this document.