Crystal XP2i 2nd Generation - Manual (Page 9)

Functions  7
XP2i Operation Manual
Water density (Inches of Water)
The following applies only to models where inch of water is a selectable pressure unit. As shipped from the factory, the XP2i is set to display inches of water
corresponding to the density of water at 4°C (39.2°F). You may require a different water density for your application, so the XP2i can be set to use the density
of water at 20°C (68°F) or 15.6°C (60°F), instead.
To check and/or change the water density setting from the keypad, turn on the XP2i by pressing the
(
on/off
)
button and the
(
units
)
button simultaneously.
The display will indicate either “4C” , “60F”, or “68F”.
Press the
(
units
)
button until the display cycles to the desired water density, then press the
(
zero
)
button to store the selection (this will not zero the gauge).
Select and set the desired density of water. If the XP2i is password protected, you will not be able to view or change the
water density from the keypad.
overpressure conditions
The XP2i will read pressure up to approximately 110% of the rated pressure range. Above 110% percent of the range the display will start flashing and the
readings will not be reliable. The zero function does not affect the point at which the display starts flashing to indicate overpressure, so depending on the
zero value it is possible that the display can start flashing without the maximum pressure being displayed.
For instance, if a 100PSIXP2i is zeroed when 30 PSI is being applied, it will indicate that the overpressure condition has been reached at 80 PSI (i.e., 110% x 100
PSI – 30 PSI = 80 PSI).
Overpressure can affect accuracy, but the effect is only temporary unless the sensor has been destroyed. See specifications for maximum overpressure.
Low Battery Indication
The battery icon ( ) is the first indication of a low battery. The XP2i will continue to operate accurately while the icon is visible. When the batteries are
exhausted, the letters “batt” will appear across the display. After “batt” appears, no pressure measurements will be possible until the batteries are replaced.
Battery replacement
The XP2i uses 3 AA batteries. Unscrew the four rear panel screws to gain access to the battery compartment. After replacing the batteries, the XP2i will start operat-
ing immediately (without having to press the
(
on/off
)
button). This indicates that a complete reset has occurred, and is normal.
!
WARNING: do not remove or change the batteries in hazardous locations.
Note: The XP2i is Intrinsically Safe only if powered by one of the following battery types: Rayovac Maximum Plus, Energizer® E91, Energizer® EN91,
or Duracell MN1500.