Routine Maintenance; Problem Diagnostics; Table 1 Problem Diagnostics - Gemini 501-B User Manual

6.3

Routine Maintenance

The only periodic maintenance for the instrument is to change the vacuum line filter element when the color
of the filter element turns red.
During a test, oil in the reservoir is oxidized continuously and would contaminate fresh oil added to it. The
process would eventually affect the test results. We recommend that after about 5-6 oil additions to the
nebulizer reservoir, the entire content should be discarded. Oil from the drain reservoir SHOULD NOT be
reused to avoid clogging.
6.4

Problem Diagnostics

Table 1 lists common problems and possible causes and remedies during the operation.
Symptom
Low aerosol generation and
or large bubbles in Nebulizer
reservoir.
High aerosol generation
Calibration Shift
Detector fails to alarm
Pressure LED cannot be
adjusted to "green" ("OK")
(at 15 psig)
Concentration cannot be
adjusted to reach zero
Pump running, no pressure
Dilution air indicator stays at
"Yellow". Or it cannot be
adjusted to "Green".
Table 1. Problem Diagnostics
Possible Causes
Clogged impactor
Or clogged nebulizer
Overloaded filter
Drain reservoir open
See above
Vacuum line leak
Wrong Nebulizer
Insufficient aerosol
Defective detector
Unmatched nebulizer
Leakage, defective pump
Low battery
Filter overload
Vacuum line leaks or
pump fails.
Major pressure leak
Low battery
Blockage in hose or wand
Incorrect Diffuser openings
Transducer calibration
shifted
Remedies
Clean Nebulizer. See Figure 5-D p23 and Appendix
B p18.
Clean impactor holes using can-air. (DO NOT
enlarge)
Replace vacuum filter element. Check filter
connection elbows to make sure that all tubes are
tightly connected.
Install drain reservoir.
See above.
Check line, connections, drain reservoir. Calibrate
the Tester with the Nebulizer.
Increase to the maximum concentration.
Switch to a new detector.
Calibrate nebulizer with the Tester
Contact Gemini Scientific
Charge battery overnight using charger provided.
Change filter element.
Locate and fix leak. Or contact Gemini.
Check for leak or pump function.
Charge battery overnight or use optional AC Adaptor
Remove hose or wand blockage if present.
"Yellow" - Enlarge some diffuser holes.
"Red" - Tape-close some diffuser holes.
Contact Gemini.
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