Crystal XP2i 2nd Generation - Manual (Page 4)

Overview  2
XP2i Operation Manual
„ „
oPeratIng InstructIons
The XP2i is shipped with batteries installed, so it’s ready to use. Press and hold the
(
on/off
)
button. The XP2i will first test all LCD segments. Release
the
(
on/off
)
button when the XP2i indicates pressure.
The XP2i always resumes operation in the mode and the units of the pressure last used, and it does not automatically rezero when turned on.
Connect the XP2i to your system. Always use a wrench (¾″ or 19mm) for installation and removal of XP2i! There is a limit to how much rotational force can be
applied to the case, so don’t rely on, or use, the case to screw the XP2i into a fitting, and don’t use the case to remove the XP2i fitting, either.
!
WARNING: severe injury or damage can occur through improper use of pressure instruments! do not exceed recommended pressure limits of tubing
and fittings. Be certain all pressure connections are secured.
!
CAUTION: never insert any object into the pressure connection! the sensor diaphragm is very thin and can be damaged or destroyed by solid or sharp
objects. cleaning of the sensor must be done with appropriate solvents only.
Most XP2is are intended for gauge pressure measurement. That is, they indicate the difference between applied pressure and ambient barometric pressure.
However, the
(
zero
)
button can be used to force an XP2i to read zero pressure at any applied pressure, up to the full scale rating of the gauge. The factory
default setting limits the maximum zero value to 200 PSI, but this limit can be changed with .
Some XP2is are rated for absolute pressure. Absolute gauges indicate the difference between applied pressure and an internal vacuum reference. Absolute
pressure is always positive. For instance barometric pressure at sea level is on average about 14.7 PSI (approximately 100 kPa or 1 bar), so at sea level this is
the lowest expected pressure indication. However, absolute gauges can be “zeroed” (unless prevented by ConfigXP). After zeroing an absolute gauge it is
possible to indicate a negative pressure.
!
WARNING: this gauge can display zero pressure when connected to a source of pressure! do not rely on the display indication before disconnecting—
it may not be indicating true pressure. never disconnect pressure instrumentation without first relieving system pressure!