GSI
Allegro Tympanometer
User Manual
D-0120695 Rev D 2022-06 Page 31
CAUTION
The sealing washer should be replaced when the probe tip is replaced if it shows
signs of wear, or if a pressure leak is suspected. When replacing the probe tip,
ensure that the seal is correctly located with the flat side aligned with the flat side
within the base of the probe tip. Push the probe tip over the boss and replace the nose cone.
Make sure that the nose cone is screwed home firmly but do not over-tighten. Do not use any
tools to tighten the nose cone.
After replacing the tip, a Daily Check should be carried out.
CALIBRATION AND REPAIR OF THE INSTRUMENT
GSI recommends that the Allegro is calibrated annually. Please contact your GSI distributor for
details.
If the instrument is to be used at elevations above 1000 m (3281 feet) above sea level re-
calibration must be undertaken at the intended operating elevation.
ELEVATION ADJUSTMENT
The instrument is a pressure sensitive device that makes measurements relative to ambient air
pressure. Changes in air pressure due to weather or elevation will affect the ECV readout of the
instrument. The slight pressure change resulting from changing weather conditions will usually
yield volume readouts with ± 0.1 cm
3
of the expected cavity value, but pressure changes due to
elevation can shift these cavity values by as much as 30%. These changes in pressure do not
affect the accuracy of the compliance measurement system in any way. However, it will affect
the ECV and test cavity values.
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