Campbell Scientific CS431 Submersible Pressure Transducer - Manual (Page 15)

CS431 Submersible Pressure Transducer
5.2.1.2 Example CR10X P ROGRAM – 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
, m
1
, and m
0
from enhanced process calibration
b = calculated offset value from provided calibration values b
2
, b
1
, and b
0
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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