Data Industrial 228PV40 Manuale d'uso - Pagina 6

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Data Industrial
Plastic Tee Type Flow Sensor
Calibration
Data Industrial sensors use unique K and offset numbers for calibration. These numbers are derived from
calibration runs using NIST traceable instruments. Using both a K and an offset number provides higher accu-
racy than using a K factor alone. K and offset numbers for each tee configuration are listed in the following table.

Calibration Tables

The table below provides calibration and operation data for Data Industrial Plastic Tee Sensors 1.5” to 4”.
Column 1
Column 2
Columns 3 and 4
Column 5
Model
228PV15xx-xxxx
228PV20xx-xxxx
228PV30xx-xxxx
228PV40xx-xxxx
6
Manual
Sensor Model Number
Apparent I.D. - For use with the Series 900 and the Series 1000
The K value and Offset values to use in our frequency equation:
)UHT
This equation describes the frequency of the output signal of all Data Industrial flow
sensors. By substituting the appropriate K and Offset values from the table, the
sensor’s output frequency can be calculated for each pipe size. This information is
required when calibrating an output board or when using the raw sensor data as
direct output to interface with a device that is not a Data Industrial product.
This column indicates the suggested flow range of each tee sensor. Data Industrial
sensors will operate both above and below the indicated flow rates. However, good
design practice dictates the use of this range for best performance.
Sensors should be sized for flow rather than pipe size. To prevent disturbances to
the flow profile always connect the sensor tee to pipe nipples measuring at least 10
pipe diameters in length on the up stream (supply) side and at least 5 pipe
diameters in length on the downstream (delivery) side before making the transition
in pipe size.If a lesser flow rate is chosen, an insufficient span exists for the proper
operation of these circuits. This can result in excessive ripple and fluctuations in
signal, which can adversely affect system performance.
Calibration Table for Series 228PV
Apparent I.D.
for Series
1000, 900
1.5
1.94
4.02
5.15
*SP
RIIVHW
.
K
Offset
Value
1.699
-0.316
2.8429
0.1435
8.309
0.227
13.74283
0.23707
Suggested
Operating
Range
(GPM)
5-100
10-200
20-300
40-500