Campbell-scientific CS431 Submersible Pressure Transducer Instrukcja Użytkownika Pobierz pdf (Strona 15)

CS431 Submersible Pressure Transducer

5.2.1.2 Example CR10X PROGRAM – Enhanced Measurement

In the following example

Vr = differential voltage at diff channel 1

Vo = differential voltage at diff channel 2

L = pressure measurement in nominal units

m = calculated slope value from provided calibration values m

2, m1, and m0

from enhanced process calibration

b = calculated offset value from provided calibration values b

2, b1, and b0

from enhanced process calibration

P = pressure measurement in psi units using enhanced calibration values

from calibration data sheet for the specific sensor being used

T = temperature measurement in degrees C

1: Ex-Del-Diff (P8)

1: 2 Reps

2: 3 25 mV Slow Range

3: 1 DIFF Channel

4: 1 Excite all reps w/Exchan 1

5: 1 Delay (units 0.01 sec)

6: 800 mV Excitation

7: 1 Loc [ Vr ]

8: 1.0 Mult

9: 0.0 Offset

; Calculate L factor

L=100*(Vo/Vr)

; Measure Temperature

2: Temp (107) (P11)

1: 1 Reps

2: 5 SE Channel

3: 2 Excite all reps w/E2

4: 4 Loc [ T ]

5: 1.0 Mult

6: 0.0 Offset

; L can be translated to a pressure measurement using the following formula.

; Coefficients for m and b are developed from thermal characterization and provided with the

; enhanced ;calibration sheet.

P=(m)*L + (b)

;where m = (m2)*T2 + (m1)*T + (m0) and

;where b = (b2)*T2 + (b1)*T + (b0)

; Now data can be further processed or written to data storage memory.

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Campbell-scientific CS431 Submersible Pressure Transducer Instrukcja Użytkownika Strona 15