Campbell-scientific 107-L Temperature Probe Manual do Utilizador descarregar pdf (Página 17)

Model 107 Temperature Probe

TABLE 8-1. 107 Measurement Details

Datalogger

Model

Measurement

Instruction

Excite

mV Result Scaling

Equation

Applied to

Scaled Result

CR800

CR1000

CR3000

CR5000

CRBasic

Therm107()

Steinhart-Hart

(automatically

applied)

CR10

CR10X

CR500

CR510

CR23X

Edlog

Temp(107)(P11)

2000 Vs/Vx

Multiply

by 800

‡

Fifth-order

polynomial

(automatically

applied)

21X

CR7(X)

Edlog

Temp(107)(P11)

4000 Vs/Vx

Multiply

by 800

‡

Fifth-order

polynomial

(automatically

applied)

†

Fixed series resistance is subtracted before applying Steinhart-Hart.

‡

Multiplier of 800 scales Vs/Vx for the polynomial fit.

TABLE 8-2. Temperature Calculation

CRBasic Dataloggers

Therm107() instruction measures the ratio Vs/Vx, calculates the thermistor resistance

Rs, and converts Rs to temperature using the Steinhart-Hart equation

T = 1 / (A + (B • ln(Rs))) + (C • ((ln(Rs))) ^ 3) – 273.15

where:

T = temperature in Celsius

A = 8.271111E–4

B = 2.088020E–4

C = 8.059200E–8

Edlog Dataloggers

Temp(107) (P11) instruction measures the ratio Vs/Vx and coverts it to temperature

using a fifth-order polynomial:

T = C0 + C1•X + C2•X^2 + C3•X^3 + C4•X^4 + C5•X^5

where:

X = (Vs/Vx) • 800

C0 = –53.4601

C1 = 9.0807

C2 = –0.83257

C3 = 0.052283

C4 = –0.0016723

C5 = 0.00002211

See Appendix C, Thermistor Resistance Table.

CRBasic dataloggers are CR800, CR1000, CR3000, and CR5000.

Coefficients provided by the thermistor manufacturer.

Edlog dataloggers are CR10(X), CR500, CR510, CR23X, 21X, and CR7.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 27 28

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