AMWEI Thermistor Sensor products

NTCthermistorcan be assembled in housing in a variety of configurations for temperature sensing, measurement, detection, indicator, monitoring and control.Thermistortemperature sensor probe assemblies can conveniently attach to or be an integral part of any system to monitor or control temperature. The choice of assembly is dependent on the application. The primary factors which determine the optimum configuration of a thermistor assembly are the operating environment, mounting, time response and minimum dissipation constant.

AMF58 series NTC thermistor in glass encapsulated package, diode DO35 outline, with axial tinned Dumet ( Copper-Clad Ni-Fe) wire. Widely applied in temperature measurement, detection, indicator, monitoring, gauging, control, calibration and compensation, etc.

Since all metals used for coil windings have a positive temperature coefficient of resistance,NTCthermistorsare especially useful for compensating resistance changes in devices subjected to temperature variations. Due to the high temperature coefficient of thethermistoras opposed to the low temperature coefficient of the copper, full compensation can be achieved by using athermistor- resistor network. This network adds less than 15% to the total impedance of the circuit. Compensation of transistor amplifiers, crystal oscillators, etc. can be achieved by using similar methods.

PTC (positive temperature coefficient)thermistorswitches at one particular temperature. Making use of the characteristics that the resistance ofPTCthermistorsincreases sharply above curie temperature, when ambient temperature increases abnormally, protective circuit installedPTCthermistorwill turn on or cut off loop through resistance changing, achieving thermal protection purpose.PTCthermistorsprotect such equipment and components as motors, transformers, power transistors and thyristors against over-temperature. APTCthermistoris less expensive than a thermostat, and its switch temperature can be more accurately specified. It is also smaller and easier to design-in to electronic circuitry. ThereforePTCthermistorscan be ideal devices for temperature detection, monitoring, indicating, limiting and over (excessive) temperature protection.

PTCR Motor start packages can be economical solid state torque assist for heat pumps, room air, commercial and residential air conditioning and refrigeration systems. PTC thermistors can be used to protect the auxiliary starter winding of induction motors or single phase motors. Compared to the alternative start capacitor and relay, PTCR Motor start devices save several wires, occupy less panel space, mount more easily, and cost less.