Operating Instructions - CPC4000
109
Industrial Pressure Controller
CPC4000
10.10 Head Pressure
The Head Pressure Application provides an automated way to calculate the head pressure
offset between a device being tested and the CPC4000 transducer, based on:
• Height: the difference between the device under test and the sensing element in the trans-
ducers in the CPC4000
• Gas Density: the media density of the pressure media
• Gas Temperature
• Local Gravity
The Head Pressure application is placed under the password protected area of the operator interface to
safeguard against inadvertent activation. It is intended to be used to accurately measure the pressure at
an external source that is at a different elevation from the CPC4000 transducer sensing that pressure.
The four parameters are used to calculate the pressure that is a result of the different elevations. It should
not be used when calibrating CPC4000 transducers. The Head height should be set at zero before cali-
brating the transducers of the CPC4000.
i
Notice
The Head Pressure should not be active when calibrating CPC4000 transducers.
The Head height should be set at zero before calibrating the transducers of the
CPC4000. Difference in height between the laboratory standard and the CPC4000
during calibration should be factored into the uncertainty analysis.
Figure 10.10 shows the Head Pressure screen. The height, gas density (Nitrogen or dry air), gas tem-
perature and local gravity can be entered here based on the specific setup of the system.
Figure 10.10 – Head Pressure, Pneumatic
