42
6.2 Monitoring System
WARNING: The sample stream flow rate is set to 225 ml/min. Check
the trigger sensitivity of a ventilator in synchronized mode when using
the
NOxBOX
i
system to ensure that it is not being tripped by the
sample stream flow.
NOTICE: For patients on very low tidal volumes it may be necessary
to increase the bias flow to reduce the effective leak created by the
NOxBOX
i
sample rate. For example, increasing bias flow from 2 L/min
to 8 L/min can reduce apparent leak from 78% to 20%, and effectively
reduce risk of NO
2
build-up.
A sample point is located close to the patient Y-piece, which takes a small sample from the
delivered inhalant gas mixture, pulled at a steady rate by the internal sample pump.
The sample gas is conditioned by passing through a water trap to remove condensate and a
drying tube to achieve correct humidity, before passing across the three gas sensors where the
sample is analysed for the three
constituent gases of interest NO, NO
2
and O
2
.
An electronically controlled valve within the sample circuit can be switched to perform an automat-
ic zero-calibration function. This allows the monitor to take a baseline reading of clean air to check
and correct for sensor drift.
6.3 Touch Screen Interface
6.3.1 Brief Navigation Guide
The service key enables the Service Engineer log-in.
Press Next to proceed to next screen.
Press Back to return to the previous screen.
Press to accept or confirm the statement on-screen
Press to decline or deny the statement on-screen
Greyed out buttons indicate that they are temporarily disabled. An action or
test must be performed or completed to activate.
6.3.2 On-screen User Guide
The NOxBOX
i
has an integrated Quick Start Guide (QSG) that displays step-by-step instructions
on-screen.
Summary of Contents for NOxBOX mobile
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