TSI Incorporated VELOCICALC Plus 8360, Operation And Service Manual

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Chapter 3
8
Flow Rate (Calculated Using Pressure and Flow Factor, Model
8382, 8383, and 8388 Only)
This option is available with Model 8382/8383/8388 only when DIP switch
#6 is ON (refer to Appendix B). The flow rate through a diffuser is
calculated by multiplying a pressure reading by a manufacturer-supplied
flow factor. This flow rate measurement method is applicable for diffusers
that contain pressure taps designed for this purpose.
NOTE: When using this option, make sure that the V
ELOCI
C
ALC
pressure
measurement units and flow rate measurement units are set using the DIP
switches to correspond to those provided by the diffuser manufacturer (refer
to Appendix B). If using kPa to do this measurement, flow factors should be
entered using Pa, not kPa. If they are set incorrectly, the calculated flow rate
will be incorrect.
The V
ELOCI
C
ALC
will display flow rate and pressure units simultaneously to
indicate that the flowrate is being measured from pressure and not from
velocity and area. To zero the pressure transducer while in this
measurement mode, press and hold the
PRESSURE key. The pressure will
zero and the VelociCalc will return to flow rate from pressure measurement
mode.
Entering Flow Factor
Press the
FLOWRATE
key to put the V
ELOCI
C
ALC
in flow rate mode.
The V
ELOCI
C
ALC
will prompt you to enter the shape, size, or flow
factor if this has not been done since the instrument was turned on.
The V
ELOCI
C
ALC
will alternately flash the circle, rectangle, and
pressure units on the display. If shape, size, or flow factor have been
entered, the V
ELOCI
C
ALC
will go directly to displaying flow rate.
Press the
SHAPE
key to select the pressure-flow rate measurement
method. Each time the SHAPE key is pressed the shape will change
between the circle, rectangle, and pressure units. When the pressure
units appear on the display, press the
ENTER key. The V
ELOCI
C
ALC
will then ask for the flow factor.
The V
ELOCI
C
ALC
will display ‘
FAct =
‘ and the current flow factor.
Use the
LARGER
and
SMALLER
keys to select the value of the flow
factor and press ENTER to accept it.
To change the flow factor, press the
SHAPE key to select the pressure
units. Proceed as above to enter the value.