Crystal XP2i 2nd Generation - Manual (Page 26)

Support  24
XP2i Operation Manual
Support
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trouBLesHootIng
The XP2i 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 XP2i against a hydraulic deadweight
tester or piston gauge, the reading on the XP2i may appear unstable - the least significant digit jumps
up and down several counts.
X 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.
X 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.
X 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.
X solution
Evacuate all tubing with a vacuum pump, before introducing fluid into the system.
err 1 displayed
X reason
The XP2i 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.
X solution
Contact factory for instructions on how to restore the memory to the original factory settings.
err 2 displayed
X reason
The XP2i 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.
X solution
Contact factory for further instructions.
err 5 or err 6 displayed
X reason
The XP2i pressure sensor is exhibiting out of normal operating condition behavior.
X solution
Contact factory for sensor replacement.
display continuously Flashes all segments
X reason
After a reset, and after replacing batteries, the XP2i checks the integrity of program memory. If for
some reason it has been modified or corrupted, it flashes all segments, and prevents normal operation.
X solution
To restore the memory to the original factory settings, refer to How to update firmware on a flashing
(or data logger mode) gauge with XP2iUpdate in the FAQ section of our website at:
www.crystalengineering.net/faq .