Model 415C & 415SGS Instruction Manual
D01669102
April 2019, Revision A
20
6.8.2
Calibrating Pressure
Figure 6-4 Software Screenshot
Pressure calibration must be performed by a qualified individual that has a certified
pressure calibration device. When the screen above appears, connect the pressure
calibrator to the top of the pressure vessel using a 9/16-18 high pressure nut. Enter
a lower-limit pressure value on the calibrator. Touch the Enter Low Value
parameter box shown in and then enter the correct pressure value for the low data
point using the touchpad at the right. The raw value is the voltage signal read
directly from the I/O hardware and it should change as the calibration signal
changes. When the low data point has been entered, press the SAVE LOW VALUE
button. The user can now enter the high data point on the calibrator and then again
on the touchscreen as before. The raw value should be different for the low and
high data points or there will be a computation error. After the high data point has
been established, press the SAVE HIGH VALUE button. We recommend using a
low value of house air pressure and a high value of 20,000psi or near maximum
operating pressure. The user can now vary the calibration signal and see how the
calibrated signal compares with that of the calibration device in the VERIFY NEW
CALIBRATION box. If the signals compare favorably, press the SAVE button to
save the calibration. The calibration values will be stored in a configuration file and
take effect upon saving and exiting the Instrument Setup menu.