PN: 2975 Rev F, 3/2004
Page 9 of 24
C R Y S T A L
engineering corporation
Troubleshooting
The XP2 is a very high performance gauge. Due to the high resolution of this product, you
may observe conditions that appear to be defects in the product, but are in fact a result of
being able to resolve and measure pressure to a degree not possible with other instruments.
Noisy or unstable reading when used with fluids
When calibrating or comparing the indicated pressure from an XP2 against a hydraulic
deadweight tester or piston gauge, the reading on the XP2 may appear unstable - the least
significant digit jumps up and down several counts.
Reason: Gas (usually air) is trapped in the line between the gauge and the deadweight
tester. What is actually happening is the mass is oscillating up and down, and the
combination of gas and fluid is acting like a spring. At higher pressures (above
2000 PSI, typically) this may eventually diminish, as the gas dissolves into the
fluid.
Solution: Evacuate all tubing with a vacuum pump, before introducing fluid into the system.
Non-repeatability of pressure measurements
When checking the gauge against a hydraulic deadweight, increasing pressure
measurements do not match decreasing pressure measurements.
Reason: As in the previous note, gas has dissolved into the hydraulic fluid. When
decreasing the pressure, the dissolved gas then leaves the fluid, but at an
uneven rate, so small pressure differential (due to fluid head pressure) may exist
between the reference deadweight and the gauge being tested.
Solution: Evacuate all tubing with a vacuum pump, before introducing fluid into the system.
Slow return to zero and/or non-repeatability of pressure measurements
Reason: Filter is obstructed.
Solution: Clean filter - see “Filter” section for instructions.
Err 1 displayed
Reason: The XP2 checks the integrity of internal calibration coefficients every time
it’s turned on. If any coefficients have been corrupted in any way, “Err 1” is
displayed.
Solution: Contact factory for instructions on how to restore the memory to the original
factory settings.
Err 2 displayed
Reason: The XP2 has tried to display a number too large for the display (i.e., more than 5
digits). May be due to an electrical malfunction or numerical error.
Solution: Contact factory for further instructions.
Display continuously flashes all segments
Reason: After a reset, and after replacing batteries, the XP2 checks the integrity of
program memory. If for some reason it has been modified or corrupted, it flashes
all segments, and prevents normal operation.
Solution: Contact factory for instructions on how to restore the memory to the original
factory settings.
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