Crystal XP2i 2nd Generation - Manual (Page 6)

Functions  4
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
To use the tare feature, press the Peak button until TARE is displayed. Apply pressure to the gauge until the desired tare value is reached. Press the zero but-
ton. The top line will change from true pressure to the tared pressure. The amount of the tare will be displayed on the second line.
The tare function is disabled by default, but can be enabled with ConfigXP.
Tare is in effect only when the tare icon is on.
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 HI , LO , AVG, and TARE icons will
not be lit. Rate is calculated every pressure measurement (3 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 until no icons are lit but the second line is displaying a value. 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.