26
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 the following table:
From
→
To
↓
psi
"H
2
O
'H
2
O
mm H
2
0
m H
2
0
"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
"H
2
O
27.730
1
12
.039372 39.372 13.596
.53525
406.78
.40147
401.47
4.0147
4016.1
'H
2
O
2.3108
.08333
1
.003281
3.281
1.133
.044604 33.8983 .033456 33.4558
.3346
334.6
mm H
2
0 704.32
25.399 304.788
1
1000
345.32
13.595
10332
10.197
10197
101.97
101970
m H
2
0
.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
4.9 “IDdddddddddddddddd” - Display or Set Datalogger ID
The ID is a 16-character string that can be used to identify a datalogger and the data that is
transmitted by it. If an ID is entered, it will be transmitted as the first element in each array of
data. For example:
*ID
Datalogger ID:
*IDDatalogger#1
Datalogger ID:Datalogger#1
*ST
Logging started.
Datalogger#1,2009,94,0939,20,3.22,23.19,9986.034,25.0,1
*Datalogger#1,2009,94,0939,25,3.22,23.36,9985.864,25.0,2