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4Ć95
Troubleshooting the System
Problem Probable Cause and Solutions
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↑ or
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↓ or
Out of Range message
The result is above (up arrows) or below (down arrows)
the limits of the system’s measurement range, as described
in Appendix E, Performance Characteristics.
1. Verify the manufacturer’s control values and ascertain
whether a value outside the system’s measurement
range is likely.
2. Check for sample movement during measurement.
3. Check the fluid in the sample path for bubbles.
4. Perform a wash.
5. Retest the control if appropriate.
6. Check pH, ISE, and reference sensor fill levels.
7. Perform a successful two-point calibration.
8. Verify that the control is prepared, handled, and stored
correctly.
9. Test a new set of controls.
10. Verify that the sample pump is operating correctly and
test the sample pump flow rate as described in Pump
Functions Test, page 4-58.
↑ or ↓
↑↑
or ↓↓
The result is above (up arrow) or below (down arrow) the
established control range.
1. Verify that the control is prepared, handled, mixed,
and sampled correctly.
2. Review the control manufacturer’s storage
instructions. Avoid storing controls near heated or
cooled areas, such as the system, a heating vent, or an
air conditioner vent.
3. Verify that the controls are not outdated or
deteriorated. Use controls only within their expiration
date.
4. Verify that the reagents are not outdated.
5. Perform a successful two-point calibration.
6. Check for sample movement during measurement.
7. Check the fluid in the sample path for bubbles.
8. Perform a wash.
9. Retest the control.
10. Ensure that sensors are filled with the appropriate
solutions and are free of bubbles.
11. Verify that the sample pump is operating correctly and
test the sample pump flow rate as described in Pump
Functions Test, page 4-58.
(Continued)