Ametek Crystal Pressure WT Series Panduan Pengoperasian - Halaman 15

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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 dead
weight tester or piston gauge, the reading on the XP2i 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.
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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.
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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
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pressure, the dissolved gas then leaves the fluid, but at an uneven rate, so small pressure differen-
tial (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.
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Err 1 Displayed
Reason:
The XP2i checks the integrity of internal calibration coefficients every time it's turned on.
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If any coefficients have been corrupted in any way, "Err 1" is displayed.
Solution:
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Contact factory for instructions on how to restore the memory to the original factory
settings.
Err 2 Displayed
Reason:
The XP2i has tried to display a number too large for the display (i.e., more than 5 digits).
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May be due to an electrical malfunction or numerical error.
Solution:
Contact factory for further instructions.
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Err 4 Displayed on -DD, Dual Line Display Gauge.
Reason:
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The gauge is a master in differential mode that cannot detect the slave device.
Solution:
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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
Reason:
The XP2i pressure sensor is exhibiting out of normal operating condition behavior.
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Solution:
Contact factory for sensor replacement.
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XP2i Operation Manual