23
Type Measurement
Type
Description
Output
Units
Linear Range Polynomial
Range
0
Channel Disabled
1 Vibrating Wire Middle frequency sweep, 1400-3500 Hz Digits 1960 to 12250 1.960 to 12.250
2 Vibrating Wire High frequency sweep, 2800-4500 Hz
Digits 7840 to 20250 7.840 to 20.250
3 Vibrating Wire Very low frequency sweep, 400-1200 Hz Digits 160 to 1440 0.160 to 1.440
4 Vibrating Wire
Low frequency sweep, 1200-2800 Hz
Digits 1440 to 7840 1.440 to 7.840
5 Vibrating Wire Very high frequency sweep, 2500-4500 Hz Digits 6250 to 20250 6.250 to 20.250
6 Vibrating Wire
Low frequency sweep, 800-1600 Hz
Digits 640 to 2560 0.640 to 2.560
Table 3 - Gage Type Descriptions
The “Digits” calculation for the Vibrating Wire transducer output when using linear conversion
is based on this equation:
Digits = frequency
2
×
10
-3
Equation 3 - Digits Calculation using Linear Conversion
The “Digits” calculation for the Vibrating Wire transducer output when using polynomial
conversion is based on this equation:
Digits = frequency
2
×
10
-6
Equation 4 - Digits Calculation using Polynomial Conversion
Frequency, in the above equations, represents the resonant frequency of vibration of the wire in
the transducer (in Hertz) as determined by the datalogger.
To convert calibration factors (pressure transducers are usually psi per digit) to other engineering
units consult Table 4.
NOTE:
In LogView Sensor Settings, when output units are set different than inputs units, a
conversion factor (see Table 4) is automatically applied to the gage factor of each sensor. See the
LogView User’s Guide for more information on Sensor Settings.
From
→
To
↓
psi
"H2O
'H2O
mm H20
m H20
"HG
mm HG
atm
mbar
bar
kPa
MPa
psi
1
.036127 .43275 .0014223 1.4223
.49116 .019337 14.696 .014503 14.5039 .14503
145.03
"H2O
27.730
1
12
.039372 39.372
13.596
.53525
406.78
.40147
401.47
4.0147
4016.1
'H2O
2.3108
.08333
1
.003281
3.281
1.133
.044604 33.8983 .033456 33.4558
.3346
334.6
mm H20 704.32
25.399 304.788
1
1000
345.32
13.595
10332
10.197
10197
101.97
101970
m H20 .70432 .025399 .304788
.001
1
.34532 .013595 10.332 .010197 10.197
.10197
101.97
"HG
2.036
.073552 .882624 .0028959 2.8959
1
.03937
29.920 .029529 29.529
.2953
295.3
mm HG 51.706
1.8683 22.4196 .073558 73.558
25.4
1
760
.75008
750.08
7.5008
7500.8
atm
.06805
.0024583 .0294996 .0000968 .0968
.03342 .0013158
1
.0009869 .98692 .009869
9.869
mbar
68.947
2.4908 29.8896 .098068 98.068
33.863
1.3332
1013.2
1
1000
10
10000
bar
.068947 .0024908 .0298896 .0000981 .098068 .033863 .001333 1.0132
.001
1
.01
10
kPa
6.8947
.24908 2.98896 .0098068 9.8068
3.3863
.13332 101.320
.1
100
1
1000
MPa
.006895
.000249 .002988 .00000981 .009807 .003386 .000133 .101320
.0001
.1
.001
1
Table 4 - Engineering Units Multiplication Factors