7.4 Zeroing procedure
Zeroing of EMMA is performed by the following procedure. The presence of ambient air (0% CO
2
) in the
EMMA Airway Adapter is of crucial importance for a successful Zeroing.
1. Start EMMA by pressing the Power On button.
2. Make sure that a new EMMA Airway Adapter is properly fitted.
3. Press and hold down simultaneously the Power On button and Alarm Silence button until the
Service Screen display the Service Code “C0” and the Service value “9”. Keep both buttons
depressed while the Service value starts "counting down" i.e. displaying "9" - "8" - "7" etc. until
"0" is displayed.
4. Once the Service value display “0”, Zeroing of EMMA is completed.
Gas readings should be verified with a reference instrument at regular intervals. Zeroing should be
performed whenever an offset in gas readings is discovered. Zeroing is recommended after 500 hours of
operation.
EMMA will return to normal screen when the Service value has reached "0" or if any of the buttons are
released.
Note: Special care should be taken to avoid breathing near the EMMA Airway Adapter before or during
the Zeroing procedure.
7.5 Gas Span Check
EMMA does not require any routine calibration. A gas span check is recommended at regular intervals to
make sure the measurement is within accuracy levels. The suggested interval for gas span check is
once every year.
To perform a gas span check of EMMA you will need:
1. A gas flow regulator with a plastic tube and a 15M
connector
2. Calibration gas (5% CO
2
, 21% O
2
, Balance N
2
)
3. Two EMMA Airway Adapters
22(32)
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