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CALIBRATING A PRESSURE TRANSMITTER
When calibrating a transmitter, both the upper and lower displays are used. Pressure and Temperature Transmitters with ranges of 0 to 20 mA, 4 to 20 mA, and
10 to 50 mA can be calibrated by an HPC50. The example below will use a 4 to 20 mA pressure transmitter.
To Calibrate a Pressure Transmitter
X
1
Select
mA
In in the upper display and
P1
2
Select
4 to 20mA
from the Range list.
3
Connect the HPC50 to the transmitter.
HART Resistor
X
The HPC50 has an internal 250 Ohm HART resistor that can be selected if desired. With the
On or Off.
Percent Error Function
X
The HPC50 can be programmed to calculate a deviation or % error from 4-20 mA output. This eliminates the need for manual calculations and can also be
helpful if it becomes difficult to set an exact pressure with an external pump. The HPC50 simultaneously displays pressure, mA, and percent error.
1
Select
% Error
from the mA units selection in the upper window.
(
)
2
Use the
arrow
buttons to set the 0 and 100% points for both the mA and pressure ranges of the transmitter.
3
Increase pressure to the desired point and the HPC50 upper display will indicate the % error as well as the actual mA value. The lower display will show the
measured pressure.
in the lower display.
(
)
settings
button, choose
General
to select HART resistor
18
Operation
HPC50 Series Operation Manual
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