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module. This ability eliminates the need for “on-the-fl y”
change between fl ow volume and fl ow velocity measure-
ment functions when doing airfl ow testing.
To set the HHC up to present simultaneous display of
fl ow velocity and fl ow volume follow the steps below.
Step 1
Set the HHC up to display fl ow velocity or
volume (refer to Sections 14.2 and 14.4 for informa-
tion on setting up the HHC to perform fl ow velocity or
fl ow volume testing). In this example, we will assume
the HHC is starting from the simultaneous display of
two fl ow velocity measurements. In this mode the HHC
display will look as follows:
ft/min ft/min
+12345 +12345
Step 2
Using the port select key, deactivate the side of
the display that you wish to maintain in the current fl ow
measurement mode. In this case we will display fl ow in
terms of ft/min on the left side and ft3/min on the right
side of the display.
PORT
SEL
Pressing port select once will deactivate the right side
of the display from fl ow or pressure measurement and
convert it to an mA measurement function.
ft/min mA
+12345 +1234
Pressing port select a second time will deactivate the left
side of the display from fl ow or pressure measurement,
converting it to an mA measurement function. The right
side of the display will resume fl ow/pressure measure-
ment activities. The second press of the port select key
will result in the following data display.
m/A ft/min
+12345 +12345
In this example, since we will be leaving the left side of
the display in terms of ft/min the port select key should
be pressed two times to produce the display:
m/A ft/min
+12345 +12345
Step 3
With the desired side of the display deactivated
press the fl ow key on the keypad of the HHC.
FLOW
The HHC will respond by displaying:
Flow Velocity
Velocity Volume
Step 4 Using the left/right arrow keys select the
desired measurement function.
In this case we have decided that the left side of the dis-
play will remain in the velocity mode and the right side
will be changed to measure fl ow in terms of volume.
Therefore, volume should be selected for this example.
Flow Velocity
Velocity Volume
Step 5 With the word volume fl ashing press the
enter key.
ENT
The HHC will respond by displaying:
m/A ft3/min*
+12345 +12345
*Refer to engineering unit selection, Section 14.5, if an
alternate unit of expressing fl ow volume is desired.
Step 6
Press the port select key to reactivate the left
side of the display for fl ow or pressure measurement.
PORT
SEL
The left side of the display will have remained in terms
of ft/min. When reactivated the display will look as fol-
lows:
ft/min ft3/min
+12345 +12345
The HHC is now set up for simultaneous display of fl ow
volume and fl ow velocity.
To Exit Flow Measurement and Return to Basic Pressure
Measurement Press the Clear Entry Key (CE).
Section 14.10 Simultaneous Display of Flow and
Electrical Output Measurements
As outlined previously, the HHC can present pressure
measurement data from one or two Quick Select pres-
sure modules simultaneously. This ability also extends
to the HHC’s ability to display fl ow measurement data.
In addition, the HHC can simultaneously display a fl ow
measurement on one side of the display and a current
or voltage measurement on the other side of the display.
This capability can be useful in calibrating transducers
and transmitters that are calibrated in terms of fl ow, such
as 0-200 ft/minute.
To take a fl ow measurement and monitor the electrical
output from the device under test follow the procedures
below:
Step 1
Set the HHC up to function in the desired fl ow
Summary of Contents for PTE-1
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