Maintenance
Aspiration Needle and Aspiration Tubing
The heart of nebuliser function, the Aspiration Needle, should be
cleaned daily or whenever the stability or accuracy of the instrument
is in question. Cleaning periodically during the period of use usually
keeps blockages to a minimum and may be conveniently carried out
by gently forcing deionised water from the syringe through the
aspiration tube.
More severe blockages can often be removed by running Nebuliser
Cleaning Rod through the inside of the needle and/or replacement of
the aspiration tubing. Refer to the Nebuliser Cleaning instructions
detailed below for thorough cleaning in the case of stubborn
blockages
Nebuliser
The Nebuliser should be checked according to the maintenance
schedule, or more frequently if results are erratic or an obstruction is
suspected.
Prior to carrying out this procedure ensure the flame is
extinguished.
Checking the Nebuliser:
1. Ensure both the Needle and Aspiration Tube (max 160mm) used for
the test are clean and free of obstructions.
2. Unscrew the Nebuliser Retaining Clip and remove the Nebuliser from
the Mixing Chamber.
3. If alternate air supply is being used, switch this on and continue with
step 7.
4. If using the internal air supply switch on the power to the
instrument.
5. From the Welcome menu, choose Maintenance menu.
6. From the Maintenance menu, choose Run Compressor to start the air
compressor.
7. Aspirate deionised water.
8. Measure the aspiration rate by timing how long it takes to aspirate a
known amount of water. The aspiration rate should be within 2.8-4.5
millilitres/minute.
9. Observe the mist. It should consist of fine droplets extending about
15-20 cm. Larger droplets may also be emitted intermittently. This
is normal. However, a constant stream of larger droplets could
indicate a problem with the Nebuliser. Alternatively, if the aspiration
rate is too low or there is no fine mist, the Nebuliser needs cleaning.
10. If the Nebuliser performance is satisfactory refit into the instrument
and secure with the retaining clip.
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No attempt should be made to remove (or adjust) the
Aspiration Needle from the nebuliser body.
No attempt should be made to remove (or adjust) the
Aspiration Needle from the nebuliser body.
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