CareFusion MicroDL, Operating Manual

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The warning will flash for a few seconds and the unit will turn itself
off. Replace the battery by sliding off the battery cover at the back
of the unit, unclip the exhausted battery and replace with a new
battery of the correct type.
Note: if the battery is not to be used for long periods, the battery
should be removed to prevent damage to the instrument by possible
leakage.
Calibration Check
The MicroDL is calibrated to read in litres at body temperature,
barometric pressure, and saturated with water vapour (BTPS) for
FEV1 and FVC. The units of PEF are litres per second BTPS or litres
per minute BTPS depending upon the configuration in the PC
software.
The calibration should remain stable indefinitely, unless the
transducer is physically damaged, and the unit should not require
re-calibration.
However, as a check on the correct functioning of the unit we do
recommend that the calibration is checked periodically.
To check the calibration of the unit a large syringe should be used.
This should have a 30mm outlet and be of at least three litres in
capacity and preferably six litres.
A 3 Litre Syringe is available from CareFusion as Cat. No. 36-
SM2125. The MicroDL should be connected to this syringe with the