Crystal XP2i 2nd Generation - Manual (Page 10)

Functions  8
XP2i Operation Manual
reset
If for some reason the XP2i needs to be reset, remove any battery for at least one minute, then reinstall the battery. If the reset is successful, the XP2i will
start operating without pressing the
(
on/off
)
button. Reset will clear the zero, peak values will be reset to the current reading, and the XP2i will be set to the
default engineering units.
!
WARNING: do not remove or change the batteries in hazardous locations.
PsVtest Mode
PSVtest mode is designed for PSV and PRV (“Pressure Safety Valve” and “Pressure Relief Valve”, respectively) as well as for Rupture Disc (also known as “Burst
Disc”) testing. It increases the measurement rate of the XP2i gauge to approximately seven times per second and replaces the Peak Lo logic with a method of
automatically recording the closing pressure of the valve after it opens.
The flashing HI icon indicates that the PSVtest mode is enabled. A special feature of PSVtest is that Peak Low LO is automatically reset to the Peak Hi value
whenever a new Peak Hi value is recorded. Once pressure stops increasing, as when a PSV opens (and the pressure drops below the recorded maximum pres-
sure) Peak Lo records the new minimum pressure values, capturing the closing pressure of a PSV.
After the valve has closed, pressing the Peak button cycles the display to show the opening pressure (Peak Hi) and the closing pressure (Peak Lo) of the valve.
Additional important information about PSVtest:
•
Peak Hi must be on the screen and flashing to utilize the 7 readings per second feature.
•
Temperature compensation is not updated during the PSVtest mode.
•
Pressing the zero button in PSVtest mode causes the XP2i to update the temperature compensation reference temperature.
•
When not indicating Peak Hi, the XP2i is continually temperature compensated, but Peak Hi and Lo are recorded at the normal rate of 3 readings per
second.
•
This mode is not recommended for long term measurements or where temperature of the gas or fluid may change significantly during the test.
•
The gauge must be running firmware version R0012 or later (for XP2i gauges) or R0113 or later (for XP2i-DD gauges) for this function to be available.
Use XP2iUpdate (free, on www.xp2i.com ) to upgrade any gauge to the latest firmware.
An application note detailing the operation of the PSVtest mode is available on www.xp2i.com , and includes examples on how to use the gauge in relief
valve and burst disk testing.