Thermistor: Definition, Uses & How They Work

What is a Thermistor? A thermistor (or thermal resistor) is defined as a type of resistor whose electrical resistance varies with changes in temperature. Although all resistors’ resistance will fluctuate slightly with temperature, a thermistor is particularly sensitive to temperature changes. Thermistors act as a passive component in a circuit. They are an accurate, cheap, … Read more

Sensor | Types of Sensor

Let us consider a measurement system. It is composed of an input device which senses the environment or surrounding to generate an output and, a signal processing block which processes the signal from input device and an output device which presents the signal to human or machine operator in a more readable and usable form. … Read more

Resistance Temperature Detector or RTD | Construction and Working Principle

A Resistance Thermometer or Resistance Temperature Detector is a device which used to determine the temperature by measuring the resistance of pure electrical wire. This wire is referred to as a temperature sensor. If we want to measure temperature with high accuracy, RTD is the only one solution in industries. It has good linear characteristics … Read more

Bimetallic Strip Thermometer

Every metal and alloy has its won coefficient of expansion. That means they are expanded in their size differently for same temperature increase. If we couple two strips made of two different metals or alloys, then due to dissimilarity in coefficient of expansion they will be expanded or contracted differently during temperature change and consequently … Read more

Thermocouple Temperature Measurement

The thermocouple is widely used temperature sensor in industry. Whenever two different types of metals are connected together, a thermoelectric potential (sometimes called thermoelectric EMF) is generated across the two free ends the metals according to the temperature of the joint. This is known as the thermoelectric effect. Such thermoelectric potentials are only a few … Read more

Characteristics of Sensors

Sensors are characterized depending on the value of some of the parameters. Important characteristics of sensors and transducers are listed below: Input characteristics Transfer characteristics Output characteristics Input Characteristics of Sensors Range: It is the minimum and maximum value of physical variable that the sensor can sense or measure. For example, a Resistance Temperature Detector … Read more

Voltage Sensor

Sensors are basically a device which can sense or identify and react to certain types of electrical or some optical signals. Implementation of voltage sensor and current sensor techniques has become an excellent choice to the conventional current and voltage measurement methods. Advantages of Sensors Over Conventional Measuring Techniques Small in weight and size. Personnel … Read more

Temperature Sensor Temperature Measurement | Types of Temperature Sensor

In previous days the thermometer was only used for measuring human body temperature and atmospheric temperature, but now days due to drastic industrial developments, it is essential to measure temperature of various situations and conditions much accurately and precisely. To achieve required accuracy and precision of temperature measurement, different types of temperature sensor have been … Read more