Crystal XP2i 2nd Generation User Manual
Page 8
Functions
6
XP2i Operation Manual
automatic shut-off
The XP2i has a shutoff timer and will turn off automatically after 20 minutes of non-operation. Pressing any button or sending any command via the RS-232
connection resets the shutoff timer for another 20 minutes of operation.
The shutoff feature can be disabled if desired. Turning on the XP2i by pressing the
(
on/off
)
and
(
zero
)
buttons simultaneously will prevent the XP2i from au-
tomatically turning off. The XP2i will briefly display the words “No Auto Off” to indicate that it will not turn off. The shutoff feature can be toggled or enabled
again when turning the XP2i on. When the XP2i is powered down, pressing the same
(
on/off
)
and
(
zero
)
buttons turns on the XP2i and returns it to auto off
functionality. The XP2i will briefly display the words “Auto Off 20” to indicate that will turn off after 20 minutes of inactivity. These settings are retained when
the product is powered down.
Backlight
Pressing the
(
backlight
)
button instantly lights the display at maximum brightness, but to keep it on you need to hold down the button for 2 seconds. The
display will flash briefly, indicating that it will stay on for 1 minute. If you press the
(
backlight
)
button again, the backlight will go into a lower brightness set-
ting to extend battery life, the display will again flash briefly, and remain on for 2 minutes. Press the
(
backlight
)
button once more and the light will go out.
If you start the XP2i in the “No Auto Off” mode, you select the brightness level the same way, but the light will never time out and turn off; you will have to
either turn off the XP2i or press the
(
backlight
)
button again until the light goes out.
Measuring Vacuum
All versions of the XP2i can be used to measure moderate vacuum, though only ranges of 300 PSI (and 20 bar or 2000 kPa) and lower are actually tested and
certified for vacuum operation.
When measuring pressure less than ambient barometric conditions, a minus (-) sign will appear.
Absolute gauges (models with a “B” in front of “XP2i” in the part number) will NOT indicate a negative sign when vacuum is applied, unless the zero button
has been pressed while a pressure greater than full vacuum is applied to the gauge. If your absolute gauge does indicate a negative pressure, you can clear
the zero value (“unzero”) by pressing the zero button until the display changes from (- - - - -) to (- - -). See “Zero” for details.
!
CAUTION: XP2is are not recommended for continuous use at high vacuum.
For continuous use at high vacuum with high accuracy, choose our XP2i-DP Differential Pressure Gauge. For product details, refer to our web site
at
.