Crystal DataLoggerXP Digital Pressure Gauge Software - Manual (Page 7)

Functions  5
XP2i Operation Manual
tare (-dd, dual-Line display XP2i only)
Tare is a constant value subtracted from the true pressure. For instance, if you were mixing gases by partial pressure, you might want to fill a tank to 1760 psi
with air, then add another 440 psi of helium. To reduce the chance of error, you could tare the gauge at 1760 psi. Then you would add helium until the indica-
tion reached 440.
PSI
TARE
PSI
TARE
PSI
TARE
Fill to pressure Press the Tare button Top-off with helium
In contrast to the Zero function discussed previously, Tare is not subject to the Zero Limit set in ConfigXP. Tare is available only when the tare icon is on. To
use the Tare feature, press the
(
peak
)
button repeatedly until the screen displays the tare icon. The tare icon will flash to remind you that live pressure may
not be indicated on the screen. Apply pressure to the gauge until you reach the desired value. Press the
(
zero
)
button. The top line will change from true
pressure to zero. The amount of the tare will be displayed on the second line.
To clear the tare, press and hold the
(
zero
)
button until the tare value changes from ( ) to ( ).
The Tare function is disabled by default, but can be enabled with ConfigXP.
rate (-dd, dual-Line display XP2i only)
Rate is the measurement of pressure change per minute. When in Rate mode, the second line will display the rate, and the /min icon will display. Rate is
calculated at every pressure measurement (4 times per second), and the displayed value is the average of the most recent 3 to 10 calculations. By increasing
the number of calculations in the average, the XP2i will indicate a more stable rate. However, the XP2i will react more slowly to changes in rate.
To use the rate feature, press the
(
peak
)
button repeatedly until the /min icon displays. As pressure changes, the second line will indicate rate of change.
The rate function is disabled by default, but can be enabled and configured with ConfigXP. The number of calculations can also
be set with the digital interface.
differential Mode (-dd, dual-Line display XP2i only)
Differential mode allows the XP2i-DD gauge (the master) to be connected to a second XP2i or XP2i-DD gauge (the slave) and display the pressure difference
between the two gauges. A standard RS232 cable (p/n 2400) and null modem adapter (p/n 3456) or a null modem cable are required to directly connect the
gauges. You must use ConfigXP to enable this feature, and once enabled, use the
(
peak
)
button on the master gauge until the Peak High (
HI
) and Peak
Low ( LO ) icons are displayed simultaneously. An XP2i-DD gauge must be running firmware version R0114 or later, and an XP2i gauge must be running
firmware version R0014 or later for this feature to work. Use XP2iupdate to upgrade to the latest firmware.
The differential mode is disabled by default, but can be enabled and configured with ConfigXP.