Support, Troubleshooting – Crystal DataLoggerXP Digital Pressure Gauge Software User Manual
Page 39
Support
37
XP2i Operation Manual
Support
—
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 dead
weight 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 4 displayed on -dd, dual Line display gauge.
X
reason:
The gauge is a master in differential mode that cannot detect the slave device.
X
solution:
1
Turn on the slave gauge.
2
Ensure you are using a null modem RS232 cable or standard cable with a null modem adapter.
3
Use ConfigXP to remove the differential mode from the gauge.
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.