Operation
12
HPC50 Series Operation Manual
X
To Display Differential Pressure
1
Select
Diff. Pres.
from the Mode section.
2
Choose the two sensors that you want to use for differential pressure.
3
Choose the unit for the differential reading.
For more information on working in the HPC50 display, see
Navigating Through a Typical Setup.
4
Apply pressure to one or both sensors to read the differential.
Differential Pressure Unit
The two pressure sensors being used can be changed from P1, P2, or APMi.
Static Pressure Unit
Note:
The static pressure is also displayed on the bottom of the window. The unit for the static pressure does not have to be the same as the differential unit.
Tare
Using the Tare function improves your
differential measurement uncertainty
significantly if used properly. The Tare function equalizes (normalizes) the
HPC50’s two modules at a non-ambient datum.
If you apply the same static line pressure to both sensors simultaneously, you should have a differential reading of zero. Due to the allowable error tolerance
for each module, the reading may not be zero. The Tare function allows you to normalize both readings so that the differential reading is zero. This gives you a
more accurate differential reading than if this process were not completed.
Note:
Tare should be reestablished every time your measurement conditions change, including vent condition. For instance if your ΔP reading has 8 inH20 of
Tare at 1500 psi static, when you return to vent condition this 8 inH20 of Tare will remain in place on your ΔP reading until cleared with the Tare button.
To Tare:
1
Use the
(
arrow
)
buttons to navigate to the Differential Mode view.
2
Press the
(
zero
)
button to activate the function button options.
3
Press the
(
function
)
button for the (
) icon.
Note:
You will notice that the word
Tare
is now included on the top right of the display to indicate that the sensors have been tared.
4
To clear the Tare value in the Differential Mode, hold the
(
function
)
button for the (
) icon for four seconds until the differential display readings
change from (- - - - -) to (- - -). The tare indication will now be removed from the display.
