Campbell-scientific 110PV Surface Temperature Probe Instrukcja Użytkownika Pobierz pdf (Strona 24)

110PV Surface Temperature Probe

6. Measurement

Understanding the details in this section is not necessary for general operation

of the 110PV Probe with CSI's dataloggers.

Signal

GREEN

Sense +

Volt Excite

WHITE

Sense -

Signal Reference

RED

BLACK

PURPLE

Signal Reference

BLUE

THERMISTOR

CLEAR (shield)

4.99 k

, 0.1%

FIGURE 6-1. 110PV Thermistor Probe schematic

Simple half bridge measurement, ignoring cable resistance

The measured voltage, V, is:

990,4

Where V

is the excitation voltage, 4,990 ohms is the resistance of the fixed

resistor and R

is the resistance of the thermistor

The resistance of the thermistor is:

⎟

⎠

⎞

⎜

⎝

⎛

−= 1990,4

The Steinhart-Hart equation is used to calculate temperature from Resistance:

))(ln()ln(

RCRBA

Where T

is the temperature in Kelvin. The Steinhart- Hart coefficients used

are:

A = 1.129241x10

-3

B = 2.341077x10

-4

C = 8.775468x10

-8

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 30 31 32

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