PTC thermistors as limit temperature sensors Probe assemblies Series/Type: B59901 Date: November 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.
Sensors Limit temperature sensors, probe assemblies D901 Applications Limit temperature sensor Dimensional drawing Features Sensor with epoxy resin coating Tinned leads Metal tag for easy mounting Characteristics for sensing temperatures Tsense = 90 to 130 °C conform with DIN 44081 Metal tag permits good thermal coupling and thus short response time RoHS-compatible Delivery mode Cardboard strips in cardboard box Dimensions in mm General technical data Max. operating voltage Max.
Sensors Limit temperature sensors, probe assemblies D901 Reliability data Test Electrical endurance, constant Damp heat Standard IEC 60738-1 Rapid change of temperature IEC 60738-1 Vibration IEC 60738-1 IEC 60738-1 Please read Cautions and warnings and Important notes at the end of this document.
Sensors Limit temperature sensors, probe assemblies Characteristics (typical) PTC resistance RPTC versus PTC temperature TPTC (measured at low signal voltage) Please read Cautions and warnings and Important notes at the end of this document.
Sensors Limit temperature sensors, probe assemblies D901 Cautions and warnings General EPCOS thermistors are designed for specific applications and should not be used for purposes not identified in our specifications, application notes and data books unless otherwise agreed with EPCOS during the design-in-phase. Ensure suitability of thermistor through reliability testing during the design-in phase. The thermistors should be evaluated taking into consideration worst-case conditions.
Sensors Limit temperature sensors, probe assemblies D901 Mounting Electrode must not be scratched before/during/after the mounting process. Contacts and housing used for assembly with thermistor have to be clean before mounting. Especially grease or oil must be removed. When PTC thermistors are encapsulated with sealing material, the precautions given in chapter "Mounting instructions", "Sealing and potting" must be observed.
Sensors Limit temperature sensors, probe assemblies Symbols and terms A Cth f I Imax IR IPTC Ir Ir,oil Ir,air IRMS IS ISmax LCT N Nc Nf P P25 Pel Pdiss Rmin RR ∆RR RP RPTC Rref RS R25 R25,match ∆R25 T t TA ta TC Area Heat capacity Frequency Current Maximum current Rated current PTC current Residual currrent Residual currrent in oil (for level sensors) Residual currrent in air (for level sensors) Root-mean-square value of current Switching current Maximum switching current Lower category temperature Number
Sensors Limit temperature sensors, probe assemblies tE TR Tsense Top TPTC tR Tref TRmin tS Tsurf UCT V or Vel VRMS VBD Vins Vlink,max Vmax Vmax,dyn Vmeas Vmeas,max VR VPTC Settling time (for level sensors) Rated temperature Sensing temperature Operating temperature PTC temperature Response time Reference temperature Temperature at minimum resistance Switching time Surface temperature Upper category temperature Voltage (with subscript only for distinction from volume) Root-mean-square value of voltage Brea
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.
