Pt100 platinum thermal resistance, its value will change with the change in temperature.
PT after 100 indicates that it is in 0 ℃ when the resistance of 100 ohms, at 100 ℃ its resistance value is about 138.
Working principle: when the PT100 at 0 degrees Celsius when his resistance of 100 ohms, its value will be along with the increase of temperature rise and become the approximate uniform.
But their relationship is not simple direct ratio relationship, but rather tend to be a parabola.
PT100 temperature sensor
is a kind of platinum (
Of resistance temperature detector, belongs to the resistivity, its resistance and the relation between the temperature changes are as follows: R = Ro (
The alpha = 0.
00392, Ro is 100 Ω (
In the resistance value of 0 ℃)
T for the Celsius temperature & lt;
So of platinum resistance temperature detector, also known as PT100.
1 + 0.
255 + T / 1000。
2: when measuring Vo, do not tell any current, or measured value will not.
Circuit analysis due to the more general power supply parts, power supply is a noise, so we use a zener diodes as regulated parts, due to 7.
2 v zener diodes, makes the 1 k resistor and 5 k of variable resistance voltage and is 6.
5 v, adjustment of variable resistance can be decided by 5 k transistors (
Current, and we should be the collector current adjusted to 2.
55 ma, the measured voltage V as indicated by the arrows of 0.
255 + T / 1000。
Subsequent noninverting amplifier input resistance is almost infinite, magnified 10 times again at the same time, the operational amplifier output to 2.
55 + T / 100。
The effect of 6 v zener diodes as 7.
The effect of 2 v zener diodes, we use it to bring up 2.
55 v, so the voltage output voltage V1 for 2 to follow.
Then the output of differential amplifier for Vo = 10 (
= 10 (
55 + T / 100 -
= T / 10, if the current room temperature is 25 ℃, the output voltage of 2.
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