Crystal XP2 Operation Manual
D i g i t a l T e s t G a u g e
O p e r a t i o n M a n u a l
X
2
P
C R Y S T A L
engineering corporation
PN: 2975 Rev F, 3/2004
Page 2 of 24
PRESSURE is Our BUSINESS
™
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
WARNING: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CAUTION:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Zero/Tare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Units button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Peak detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Resetting (clearing) recorded peak values . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Disable Peak display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Automatic shut-off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Measuring Vacuum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Water Density (Inches of Water) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Overpressure Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Low battery indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Battery replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Noisy or unstable reading when used with fluids . . . . . . . . . . . . . . . . . . . . . . 9
Non-repeatability of pressure measurements . . . . . . . . . . . . . . . . . . . . . . . . . 9
Slow return to zero and/or non-repeatability of pressure measurements . . . . 9
Err 1 displayed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Err 2 displayed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Display continuously flashes all segments . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Digital Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
I/O Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Communication Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Query Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Pressure, High . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Pressure, Low . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Water Density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Tare Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Serial Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Next Pressure Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
PN: 2975 Rev F, 3/2004
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C R Y S T A L
engineering corporation
Zero. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Clear Peaks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Water Density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
No Auto Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Disable/Enable Peak Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Acknowledgment of a Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Troubleshooting the Digital Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Programming Tips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
XP2 Model & Serial Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Serial Numbering System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Model Numbering System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Pressure Ranges, Display Scales & Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Media Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Pressure Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
C-tick. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
European Community Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . 22
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
AC adapter kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Plastic Carrying Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6″ Gauge Adapter Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8½″ Gauge Adapter Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
LabVIEW™ drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
WinXP2 Configuration Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
How to Contact Us: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
PN: 2975 Rev F, 3/2004
Page 4 of 24
PRESSURE is Our BUSINESS
™
zero
clear
zero
zero
HI
LO
zero
clear
units
Introduction
zero
Thank you for choosing the XP2 Digital Test Gauge from Crystal Engineering Corporation.
Your XP2 is a combination of leading edge technology and rugged industrial design.
The case, and almost all metal components, are stainless steel. Gaskets seal out dust and
water. Even the RS-232 connector (with or without the cover) is fully sealed!
Circuitry is mounted in a shock absorbing elastomer, and the batteries are easily accessible
by removing two screws. But you won’t need to change batteries often, since 3 AA batteries
operate the XP2 for up to 1500 hours of continuous use. If you are mounting the gauge in
a permanent location you might consider ordering the optional external power supply kit
(PN: 2984). With the external power supply the batteries serve as an automatic backup
supply, in case of power failure.
Other features include:
• continuous recording of peak and valley pressure readings
• a removable filter (to keep out large particles contaminants)
• all welded 316 stainless steel sensor
• can be cleaned for oxygen service
Accuracy is 0.1 percent of reading - so any XP2 can typically replace several of the range
rated gauges you may have been using. And the XP2 is fully temperature compensated so there is no change in accuracy throughout the entire operating temperature range!
Connect the XP2 to your system. Use pipe thread tape or pipe thread sealant on the ¼″ NPT
fitting. Always use a wrench (¾″ or 19mm) for installation and removal of XP2s! 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 XP2 into a fitting, and don’t use the case to remove the XP2
fitting, either.
To ensure safe and accurate operation, please read the following warnings:
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.
This gauge can display zero pressure with up to 200 PSI applied! 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.
Never insert any object (other than the
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.
We hope your XP2 meets your expectations, and we're interested in any comments or
suggestions you may have. You can send us a note at:
feedback@crystalengineering.net
Many features in this and our other products are a direct result of your comments!
Crystal Engineering is the company that designs, manufactures, markets and services the
XP2, 30 series pressure calibrators, MultiCal multimeter pressure adapters and a variety of
industry specific pressure measuring equipment. Crystal Engineering pioneered features
like full temperature compensation and “of reading” rated gauges and calibrators. Pressure
measuring equipment is the only thing we do and that’s why we say:
Pressure is Our Business!™
Operating Instructions
The XP2 is shipped with batteries installed, so it’s ready to use. Press the
(on/off) button and the XP2 will test all LCD segments. Continue pressing the
button for at least one second and the XP2 will start normal operation.
one second delay avoids turning on XP2 by mistake.)
The XP2 always resumes operation in the mode and the units of the pressure last used, and
it does not automatically rezero when turned on.
(The
The XP2 can zero (or “tare”) any applied pressure up to 200 PSI (or equivalent). This
means that even if zero pressure is displayed, the actual gas or fluid pressure connected
to the XP2 may be high enough to be dangerous if you were to disconnect the XP2 without
relieving the pressure first. Always check that the pressure has been equalized with
ambient pressure before disconnecting the XP2!
To zero or tare the XP2, you must turn off peak indication, then press the
for at least ½ second before it responds. The delay avoids unintentional changes to the
zero/tare setting. The display will briefly flash all dashed lines, indicating that it has been
re-zeroed. If you attempt to tare or zero the gauge when more than 200 PSI is being applied,
the command will be ignored, and “--HI-” will be displayed.
The
icon is displayed. While a peak icon is displayed the
button.
All XP2s are intended for gauge pressure measurement. That is, they indicate the difference
between applied pressure and ambient barometric pressure. The
used as a tare function, meaning it can be set to read zero pressure at for any pressure up to
the full scale of the gauge, or 200 PSI, whichever is lower.
button can also be
PN: 2975 Rev F, 3/2004
Page 5 of 24
C R Y S T A L
engineering corporation
Connect the XP2 to your system. Use pipe thread tape or pipe thread sealant on the ¼″ NPT
zero
clear
zero
zero
HI
LO
zero
clear
units
fitting. Always use a wrench (¾″ or 19mm) for installation and removal of XP2s! 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 XP2 into a fitting, and don’t use the case to remove the XP2
fitting, either.
To ensure safe and accurate operation, please read the following warnings:
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.
This gauge can display zero pressure with up to 200 PSI applied! 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.
CAUTION:
Never insert any object (other than the 1⁄16″ NPT metal filter) 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.
Zero/Tare
To make sure that the XP2 is performing to it’s rated accuracy, the XP2 should
be exercised and re-zeroed whenever exposed to changes in temperature (see
Specifications). It’s also good practice to check zero as your final reading too,
as the XP2 should return to a perfect zero reading. (If it does not return to zero,
check the filter - it may be blocked).
The XP2 can zero (or “tare”) any applied pressure up to 200 PSI (or equivalent). This
means that even if zero pressure is displayed, the actual gas or fluid pressure connected
to the XP2 may be high enough to be dangerous if you were to disconnect the XP2 without
relieving the pressure first. Always check that the pressure has been equalized with
ambient pressure before disconnecting the XP2!
To zero or tare the XP2, you must turn off peak indication, then press the
button
for at least ½ second before it responds. The delay avoids unintentional changes to the
zero/tare setting. The display will briefly flash all dashed lines, indicating that it has been
re-zeroed. If you attempt to tare or zero the gauge when more than 200 PSI is being applied,
the command will be ignored, and “--HI-” will be displayed.
The
icon is displayed. While a peak icon is displayed the
button changes its function when the peak high (
) or the peak low (
button becomes the
)
button.
Units button
Pressing this button causes the XP2 to select the next unit of pressure
measurement. There are up to 9 units available. See “Pressure Ranges,
Display Scales & Resolution” for the list of pressure units available for your
model.
PN: 2975 Rev F, 3/2004
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PRESSURE is Our BUSINESS
™
units
units
zero
Peak detection
Hi
Lo
peak
peak
HI
peak
LO
peak
zero
clear
zero
clear
clear
HI
LO
clear
peak
zero
The XP2 continuously records maximum and minimum applied pressure. To
see the recorded values, press the
appear, along with the recorded peak pressure. Press the
again and the
pressure. Pressing the
icon will appear instead, along with the minimum recorded
button once more and the display resumes
button, and the
icon will
button
normal operation, with only the current applied pressure reading displayed.
Peak high and low values are not preserved when the unit shuts off; they will reset to the
current reading when the XP2 is turned on or reset.
Resetting (clearing) recorded peak values
Peak values can only be cleared when displaying either a high or low recorded
pressure. Press the
then briefly appear across the display and both
button for at least ½ second. Dashed lines will
and
icons will flash
briefly, indicating that both peak values have been cleared. Both peak high and
low values will then display the current applied pressure. Pressing the
button while
either peak hi or peak lo icon is displayed will not affect the zero or tare value. If you need to
rezero the gauge, you must turn off both peak icons by pressing the
button.
Disable Peak display
In some cases it may be critical that the indicated pressure always be the true applied
pressure - not a stored peak high or peak low reading. For these cases the peak button can
be disabled, eliminating any possible indication of a stored reading. This feature can only
be enabled or disabled via the RS-232 interface. Refer to the Digital Interface section of the
manual for general instructions and the “Disable/Enable Peak Display” commands.
All versions of the XP2 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. XP2s are not recommended for continuous use at high vacuum (pressures less
than -14.5 PSI, at sea level). If the pressure applied is less than -14.5 PSI or equivalent,
regardless of zero or tare, the gauge will indicate overpressure (see “Overpressure
Conditions”).
The following applies only to models where inches of water are available. As shipped from
the factory, the XP2 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 XP2
can be set to use the density of water at 20°C (68°F) or 15.6°C (60°F), instead. Changing
the setting can be accomplished via the keypad, or via the RS-232 interface (see: WinXP2
Configuration Software or refer to the Digital Interface section for instructions to change the
water density via RS-232).
To check and or change the water density setting from the keypad, turn on the XP2 by
pressing the (on/off) button and the
indicate either “4C” or “60F” or “68F”.
Press the
Automatic shut-off
The XP2 has a shutoff timer and will turn off automatically after 20 minutes of 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 defeated, if desired, when turning the XP2 on. Pressing the
(on/off) and
buttons simultaneously will prevent the XP2 from automatically turning
off. The XP2 will briefly display the words “No Auto Off” to indicate that it will not turn off.
This procedure is required each time the XP2 is turned on, if you want to defeat the autoshutoff.
The XP2 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/tare function does not affect the point at which the display starts flashing to
indicate overpressure, so depending on the tare value it is possible that the display can
start flashing without the maximum pressure being displayed.
For instance, if a 100 PSI XP2 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.
The XP2 has a removable, stainless steel mesh filter, installed in
the bottom of the pressure connection. This filter is designed to
keep large particles from becoming entrapped in the sensor cavity.
If the XP2 fails to return to zero, or returns to zero or new applied
pressures slowly, the filter may be obstructed. The filter can
be removed and cleaned if necessary, by unscrewing it with a
5
air to clean it out. Or, you can purchase a replacement filter,
PN:3002.
PN: 2975 Rev F, 3/2004
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C R Y S T A L
engineering corporation
Measuring Vacuum
units
units
zero
All versions of the XP2 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. XP2s are not recommended for continuous use at high vacuum (pressures less
than -14.5 PSI, at sea level). If the pressure applied is less than -14.5 PSI or equivalent,
regardless of zero or tare, the gauge will indicate overpressure (see “Overpressure
Conditions”).
Water Density (Inches of Water)
The following applies only to models where inches of water are available. As shipped from
the factory, the XP2 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 XP2
can be set to use the density of water at 20°C (68°F) or 15.6°C (60°F), instead. Changing
the setting can be accomplished via the keypad, or via the RS-232 interface (see: WinXP2
Configuration Software or refer to the Digital Interface section for instructions to change the
water density via RS-232).
To check and or change the water density setting from the keypad, turn on the XP2 by
pressing the (on/off) button and the
button simultaneously. The display will
indicate either “4C” or “60F” or “68F”.
Press the
button until the display cycles to the desired water density, then press the
button to store the selection (this will not zero the gauge).
Overpressure Conditions
The XP2 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/tare function does not affect the point at which the display starts flashing to
indicate overpressure, so depending on the tare value it is possible that the display can
start flashing without the maximum pressure being displayed.
For instance, if a 100 PSI XP2 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.
Filter
The XP2 has a removable, stainless steel mesh filter, installed in
the bottom of the pressure connection. This filter is designed to
keep large particles from becoming entrapped in the sensor cavity.
If the XP2 fails to return to zero, or returns to zero or new applied
pressures slowly, the filter may be obstructed. The filter can
be removed and cleaned if necessary, by unscrewing it with a
5
⁄32″ (4 mm) hex key, and using solvents and/or compressed
air to clean it out. Or, you can purchase a replacement filter,
PN:3002.
PN: 2975 Rev F, 3/2004
Page 8 of 24
PRESSURE is Our BUSINESS
™
Low battery indication
The battery icon ( ) is the first indication of a low battery. The XP2 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 XP2 uses 3 AA batteries*. Batteries must only be changed in a non-hazardous
area! With a small flat blade screwdriver, unscrew the two rear panel screws to gain access
to the battery compartment. After
replacing the batteries, the XP2 will
start operating immediately
(without having to press
the button). This
indicates that a complete
reset has occurred, and
is normal.
Reset
If for some reason the XP2 needs to be reset, remove any battery for at least one minute,
then reinstall the battery. If the reset is successful, the XP2 will start operating without
pressing the (on/off) button. Reset will clear the tare, peak values will be reset to the
current reading, and the XP2 will be set to the default engineering units.
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