Troubleshooting and Maintenance

 

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ClosedSample tube rises when piston engages.
Cause: The retaining sample tube collar is missing or too loose.
Action: Fit the retaining collar tightly on the sample tube just below the bracket.
ClosedUnexpected test results.
Cause: No sample, or incorrect sample in the tube.
Action: Check that the correct sample has been loaded and the correct mass and density have been entered.
Cause: The top brass sample plug and filter paper are not in place.
Action: Install top brass sample plug and filter paper.
Cause: Sample has escaped the tube during the test.
Action: Repeat the test using two filter papers on each plug.
Cause: Inappropriate Fisher number mapping being applied
Action: Check that the Fisher number map for the material is correct.
ClosedSample escapes top of sample tube when piston first engages.
Cause: The top O-ring is worn.
Action: Check the integrity of the O-rings. See O-rings.
Cause: The sample material contains very fine particles.
Action: The loss of a very small amount of sample may not require any action. A second filter paper on the top brass plug may reduce the amount of sample lost.
ClosedOne or both pressures read close to zero during analysis.
Cause: No air supply.
Action: Ensure that the air cylinder valve, and any shutoff valves are open. Check that the regulator is set properly. Check that the air line is connected.
Cause: There is a leak or blockage in the system.
Action: Ensure the piston is engaged in the tube. Ensure the air outlet tube on the top of the moving piston mount is connected. Check the integrity of the O-rings. See O-rings.
ClosedPiston does not move.
Cause: The piston may be stationary for minutes at a time during analyses, and some piston motions are barely large enough to see, but if analysis does not progress for a long time, it's possible that the piston motor has become overloaded.
Action: Go to the Instrument view and tap the stop icon (white square in a blue rectangle. If the piston is still unresponsive, cycle power on the instrument.
Cause: The emergency stop button was pressed.
Action: Reset the emergency stop. The button shuts off power to the motor, so a home operation must be performed.
ClosedPressures are not steady during analysis.
Cause: O-rings are worn.
Action: Check the integrity of the O-rings. See O-rings.
ClosedSample mass cannot be made equal to its absolute density.
Cause: A limited amount of sample is available, or the sample has a very low bulk density and very high absolute density.
Action: Some standards require mass and density to be equal, however accurate measurements may be possible with less sample. Be sure to enter the actual mass and density. A warning that mass and density differ by more than 5% is shown, but the analysis can still be started.

 

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