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3.5: FIELD CHARACTERIZATION
FIELD CHARACTERIZATION
OFF
CALCULATE
MANUAL
ENT - ACCEPT ESC - LEAVE UP/DN - CHANGE
CHARACTERIZATION CALCULATOR
NUMBER OF POINTS:
ELECTRA POINT 1:
ELECTRA POINT 2:
ELECTRA POINT 3:
REFERENCE POINT 1:
REFERENCE POINT 2:
REFERENCE POINT 3:
ENT - ACCEPT ESC - LEAVE UP/DN - CHANGE
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300.0
400.0
Field Characterization
Field Characterization (K-factoring) of a flow element is the
adjustment of the flow measurement system to match a known
reference measurement (for our reference - most commonly
airflow traverse testing). Field Characterization is typically done
when there is insufficient straight duct run or another issue that
creates questionable output from the installed measurement
system.
A Field Characterization can be developed from one, two or
three referenced flow rates – more could be used, but are not
necessary. One traverse test is required for each flow rate. It
is recommended that a minimum of a low and a high flow rate
are used to determine a Field Characterization. If there is little
to no variance in the normal flow rate, it is feasible to use a
Field Characterization developed from a single flow rate test.
If a high and low flow rate test are performed and it is found
that these readings are substantially different, then a medium
flow rate should be considered to ensure a more accurate Field
Characterization. For any questions or concerns regarding Field
Characterization implementation, please contact Air Monitor.
Field Characterization: On enables the Field Characterization
and the selection of Calculate or Manual. The Calculate
selection will display the on-board calculator that will determine
the K-factor (device and reference data must be in-hand and
ready to input). Manual displays the Exponent and Gain value
forms for inputting externally determined Exponent and Gain
values.
Calculate
Number of Points is the number of flow reference points.
Each point is one reference flow rate (determined by traverse
testing or other) and the associated ELECTRA-flo system flow
rate. The traverse testing flow rate for these reference points
is performed before entering this screen and is written down
with the associated ELECTRA-flo point (flow rate). For most
applications, a minimum of two points (low and high flow rates)
are recommended for an accurate Field Characterization. Three
points may be required when a large correction is necessary.
Electra Point 1 and Reference Point 1 will be the flow rates for
the first test, Points 2 for the second test and Points 3 for the
third test. Best practice will be to go from the lowest to highest
flow rates when inputting this data. Once all data has been
entered and the ENT button is pushed for the final Reference
Point, the calculator will display the calculated gain and
exponent values.
IMPORTANT NOTE
Whenever a system is being retested in order to determine
a new Field Characterization (K-factor), the existing Field
Characterization should be turned off prior to testing.
Manual
Selecting Manual will allow inputting of externally determined
Gain (K) and Exponent (E) values, where:
Flow (corrected) = K x Flow (uncorrected) ^ E
IMPORTANT NOTE
A Gain (K) only Field Characterization (K-factor) can be
achieved with an exponent (E) value = 1.0.
3/21 IOM-ELECTRA-FLO-INST
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