Bedfont NoxBox - Calibration Overdue

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A red banner critical alarm is
triggered when the current supply
cylinder is running low and there
is either no other cylinder
detected or the pressure
detected in the other cylinder is
also running low.
Toresolvethisalarm,followthe
on-screen instructions to connect
a new supply cylinder to the
alternate NO inlet at the rear of
the monitor.
The system will automatically
switch to the full cylinder when
the current supply cylinder runs
too low.
6.9.3 Calibration Overdue
Zero Calibration:
Duringoperation,thesystem
requires a zero calibration once
every24hours.Therstzerois
performed during set-up as part of
the system tests.
Anamberremindermessageags
up after 24 hours use to prompt
the user to perform the zero test.
The test takes approximately 2
minutes to complete and requires
no special connections.
During this test the monitoring and
alrmsareofine,howeverdelivery
remains unaffected. Refer to
Section 6.10 for full details.