Temperature Sensor

TWO_WIRE_TEMPERATURE_SENSOR_OUTPUT_REFERENCED_TO_GROUND

Published:2009/6/24 4:12:00 Author:May

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LOW_TEMPERATURE_SENSOR

Published:2009/6/22 23:13:00 Author:May

A negative bias current can produce the off-set needed for below-zero readings using the LM34 or LM35 temperature sensor.   (View)

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TEMPERATURE_SENSOR

Published:2009/6/22 23:09:00 Author:May

The LM35 temperature sensor provides an output of 10 mV/℃ for every degree Celsius over 0℃. At 20℃ the output voltage is 20 x 10 = 200 mV. The circuit consurnes 60 μA. The load resistance should not be less than 5 kΩ. A 4- to 20-V supply can be used.   (View)

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Digital Temperature Meter Circuit

Published:2011/7/17 8:23:00 Author:Robert | Keyword: Digital, Temperature, Meter

The picture shows the digital temperature meter circuit.   (View)

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Temperature-Sensitive Diode Application Circuit

Published:2011/7/10 2:47:00 Author:Robert | Keyword: Temperature-Sensitive Diode, Application

The circuit shown in the picture is the digital temperature meter circuit which uses temperature-sensitive diode as the temperature-measurement element. It is mainly made up of the A/D converter 7107, operational amplifier LM324, 3-digit LED display circuit and temperature-sensitive diode and so on. It features high accuracy, good stability, versatility, ease of use and so on. Its temperature measurement range is 0℃~100℃ with accuracy ±1℃. The voltage follower, which is made up of the operational amplifier A1, supply power for the A/D converter integrated circuit IC2 and the temperature sampling circuit separately to reduce the interaction between them. The semiconductor transistor VT1 and R1, R2, R3 supply stable bias current for the temperature-sensitive diode VD1.   (View)

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SWF2 Type Temperature Sensor Circuit

Published:2011/6/28 7:17:00 Author:Robert | Keyword: Temperature, Sensor

The picture shows the SWF2 type temperature sensor circuit.   (View)

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TSV Type Temperature Sennor Typical Application Circuit

Published:2011/5/22 4:04:00 Author:Robert | Keyword: TSV Type, Temperature Sennor, Application

This circuit's output voltage Vo's temeratrue sensitivity is 10mV/°C. The resistance R is current-limit resistance. The capacitor C is used to improve the stability of the circuit. When the test position and the result-reading position have a far distance, the wire resistance's voltage drop would cause some extent measuring errors.   (View)

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Celsius Thermometer Circuit Composed Of LM35DZ Celsius Temperature Sensor

Published:2011/5/17 9:06:00 Author:Robert | Keyword: Celsius, Thermometer, Temperature Sensor

The Celsius Thermometer Circuit Composed Of LM35DZ Celsius Temperature Sensor is shown below.   (View)

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Precision Celsius Thermometer Circuit Composed Of SL134 Integrated Temperature Sensor

Published:2011/5/17 8:44:00 Author:Robert | Keyword: Precision, Celsius Thermometer, Integrated, Temperature Sensor

The Precision Celsius Thermometer Circuit Composed Of SL134 Integrated Temperature Sensor is shown below.   (View)

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With Linear Two-Wire RTD Temperature Measuring Circuit (XTR105)

Published:2011/5/12 9:58:00 Author:Robert | Keyword: Linear, Two-Wire RTD, Temperature Measuring

With Linear Two-Wire RTD Temperature Measuring Circuit (XTR105) is show below.   (View)

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Temperature Sensor of Current Transmission Circuit

Published:2011/5/1 22:30:00 Author:Felicity | Keyword: Temperature Sensor of Current Transmission Circuit,

The resistance in the cirtuit is metal film one. Itsaccuracy is better than 1% and temperature coefficient TCis less than ±50X10-6/K.The measuring range is from0℃ to 100℃. Current I= 4+T/6.25. The temperate unit is ℃ and the current unit is mA. The current shows KTY87two-wire current transmitter consisting of Wheatstone bridge with pre-amplifier , current transmitter stage and voltage regulator.   (View)

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XTR101 Thermocouple Input Circuit

Published:2011/4/26 8:05:00 Author:Robert | Keyword: Thermocouple

The circuit shows the thermocouple input circuit withtwo temperature zones and diode cold junction compensation. This circuit uses J-type thermocouple as temperature sensor, semiconductor diode Das cold junction temperature compensation to form the relative 0oC of the measurement, to measure the temperature, T1 temperature range is from 0 to 1000oC. The temperature of T2 is equal to the temperature TD of semiconductor diode D. When the measured temperature changes in the range of 0to 1000oC, J-type thermocouple will have a 58mV change. When the ambient temperature is +25oC, the typical value would be 1.28mV. Corresponding 0oC transmission current is 4mA, corresponding 1000oC transmission current is 20mA.   (View)

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10-bit low-power digital temperature sensor application circuit

Published:2011/3/23 3:04:00 Author:Joan | Keyword: low-power , digital temperature sensor , application circuit

Below is 10-bit low-power digital temperature sensor application circuit.   (View)

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Differential temperature measurement Circuit Diagram

Published:2011/3/21 0:52:00 Author:Joan | Keyword: temperature measurement, Differential temperature

The temperature difference between two points is often measured in many situations. For example, in water pump fan design and other designs, the impeller shape is always detemined by the temperature difference between the entrance and exit. if the difference is small, it requires high precision phase resolution. Figure 8 shows a high sensitivity temperature measurement circuit with 100mV / ℃ sensitivity. The precision op amp LM308 ouput 10 times of the differential temperature voltage the two temperature sensors measured. The Op amp output will be 0 by adjust the Rw when the two sensors are in the same temperature.   (View)

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-55-+150℃ Digital thermometer circuit diagram

Published:2011/3/30 20:52:00 Author:Ecco | Keyword: -55-+150℃ Digital thermometer

This digital thermometer electrocircuit is composed of SL590, a new semiconductor IC temperature-sensitive sensor and three half digital voltage panel 5GM14433, and it can measure the temperature in the range of -55~15o ℃. The SL590 make the temperature be a type of current semaphore, which become ratio's voltage semaphore at Celsius temperature after making the null point displacement by operational amplifier, and sent to the UX input terminal of 5GM14433, then be digital quantity displayed by LED. The supply is d.c two types, and alternating current supplyed by 220V, also could be supplyed by 4 pieces of 1.5V batteries.   (View)

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-40-+125℃ digital thermometer circuit diagram

Published:2011/3/30 20:42:00 Author:Ecco | Keyword: digital thermometer

This digital thermometer electrocircuit is composed of SL616, a newsemiconductor IC temperature-sensitive sensor and three half digital voltage panel(DVP)s, and it uses the SL616 A to measure the temperature in the ranges of -40~125 ℃. And it uses the SL161 C to measure the temperature in the ranges of -25~85 ℃, measurement accuracy after correcting is ±0.5 ℃. Its power supply use 3 sets of +6 V, ±the 10, and only +6 V power supply consume higher current(about the 65 mas), each ±10 V power supply the only consume about 3 mA current. The digital thermometer creates corresponds thermal voltage semaphore(-10 mVs/K), then the semaphor is become ratio's voltage semaphore(+10 mVs/℃) at Celsius temperature after making the null point displacement by operational amplifier, and sent to DVP to carry on digitize display as thermal amount of indication.   (View)

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Fahrenheit scale circuit diagram

Published:2011/3/20 22:56:00 Author:Ecco | Keyword: Fahrenheit scale

Fahrenheit scale circuit diagram is as below:   (View)

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LM135 temperature telemetry circuit

Published:2011/3/21 1:46:00 Author:Joan | Keyword: LM135 , temperature telemetry

When the measurement point is far away from the display meter, the voltage drop caused by the sensor's operating current in the connection conductor, superimposed on the output voltage on the sensor, will produce some measurement error. To eliminate the effect of the resistance of connecting wires, the circuit can be used as shown in Figure 5. By the use of constant current source driver LMl35, the sensor operating current is constant, and the connection lead resistance is fixed, then the voltage drop across the wire is a certain value, which can be corrected by calibration terminal to ensure the accuracy of measurements.   (View)

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LM135 package and pin function circuit

Published:2011/3/18 1:53:00 Author:Joan | Keyword: package, pin function

LM135 Series Temperature Sensor is a voltage output type precision integrated temperature sensor. It works similar to the Zener diode, the reverse breakdown voltage changes with the absolute temperature in +10 mV/K ratio. The working current is 0.4 - 5mA, and the dynamic impedance is 1Ω, which facilitate matching to instruments. The temperature sensor features high accuracy and simple application. LMl35 series temperature sensor has wide temperature measurement range of -55 to +150 ℃. LM235 and LM335 temperature measurement ranges of -40 - +125 ℃ and -40 - +100 ℃. The short-term use temperature measurement limit can be widened, respectively, to 200 ℃, 150 ℃ and 125 ℃.   (View)

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LM135 Series Internal schematic diagram

Published:2011/3/18 1:28:00 Author:Joan | Keyword: Internal schematic diagram

LM135 Series Internal schematic diagram   (View)

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