Interchangeable NTC Thermistor.middle East 5.8G Frequency microwave module

　　1. Temperature measurement

　　A thermistor in one branch of the circuit will provide accurate temperature information. In most applications, only the readout device limits the accuracy. See Figure 1.

　　Since the wire length between the thermistor and the bridge is usually not a limiting factor, this basic system can be extended to measure temperature at multiple locations from a central point. The interchangeability and large resistance variation of the thermistor eliminates any significant errors due to switches and wire lengths. See Figure 2.

　　2. Meter compensation

　　The resistance of the coil moving the meter changes with temperature, making the meter temperature dependent. Using the high negative temperature coefficient characteristics of the thermistor, the coil can be compensated, so the total resistance obtained due to the temperature rise is basically constant, so the instrument can be used in a wide temperature range, and the error is small. See Figure 3.

　　3. Differential Thermometer

　　To accurately display the temperature difference, two thermistors can be used in a Wheatstone bridge circuit. Interchangeability of thermistors simplifies circuit design and reduces part count. See Figure 4.

　　To measure heat loss in a pipe network, place thermistors at several different points and monitor the difference between these temperatures and the original temperature in one convenient location.

　　Measuring atmospheric temperature at different altitudes with reference to ground temperature is useful for inversion data and geological studies. See Figure 5.

　　4. Temperature control

　　The system can be designed to use a thermistor with a known temperature/resistance curve to form one leg of the AC bridge and a temperature calibrated variable resistor to form the other leg. When the resistors are designed for the desired temperature, the bridge will be unbalanced. This imbalance is fed into an amplifier that activates a relay to provide a source of heat or cold. When the thermistor senses the desired temperature, it opens the relay and turns off the heat or cold source, balancing the bridge. See Figure 6.

　　5. Master-slave control

　　Occasionally it is necessary to control one temperature in order to maintain another, such as product passing through a series of slots. The first slot acts as the main slot and uses a thermistor to sense temperature. Subsequent slots also use thermistors as slave slots. When these thermistors are placed in the control bridge, the slave slots are kept at one temperature relative to the master slot.

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