Bag Tee Installation to Flowmeter: Screw
knurled seal down tight onto flowmeter
making sure the rubber washer is inside the
seal nut. When tight, the bag tee should not
rotate.
NOTE: Fit mask to patient so inner mask is
pulled down tight secure to the face. Outer
mask should not be against the face. Vacuum
needs to be drawn into outer mask during
inhalation.
NON-REBREATHING VALVE
CHECK MONTHLY
With unit turned OFF, disconnect the
corrugated rubber tubing from the Rubber
Goods and breathe into the corrugated tubing
connected to the bag tee. You should not be
able to fill the bag with exhalation gas. If the
bag fills, the system’s Non-Rebreathing Valve
is not functioning properly and should be
replaced.
EMERGENCY AIR VALVE
CHECK MONTHLY
With unit turned OFF, disconnect the corrugated
rubber tubing from the Rubber Goods and draw air
with your mouth through the corrugated tubing
connected to the bag tee. You should be able to
draw ambient air through the Emergency Air Valve
(the gas bag may have to fully collapse first). Air
going through the valve sounds different than normal
gas flow.
MONTHLY CALIBRATION CHECK
The MXR Flowmeter is designed to maintain
its accuracy and performance without routine
user maintenance being required. The
flowmeter tubes and ball floats are very
resistant to accuracy changes over time such
that the direct readings of the L/min on the
scales maintain their accuracy. However, the
user can check the relative accuracies of the
% concentration and total flow valve system
by performing a simple check.
A calibration check of the % concentration
can be done by setting the % concentration
knob to 50% and the flow control knob to 3 to
4 L/min. Check to see if the tube readings
are within 0.5 L/min of each other. Servicing
is indicated if the readings are out of this
tolerance.
NOTE: Adequate and safe conscious
sedation can be achieved even if the %
concentration is outside of the listed
tolerance, since tube scale accuracies are
maintained. However, a change in the %
concentration calibration is an indication of
overall flowmeter condition. Porter
servicing is available, including
recalibration, pressure testing, internal
component checking and replacement, and
final factory testing by contacting your
Authorized Porter Dental Dealer. It is
advisable, on a two (2) year cycle, to have
the MXR Flowmeter factory checked and
serviced.
Figure 3
- 6 -
-
- 5 -
-
- 4 -
-
- 3 -
-
- 2 -
Read Center
Of Ball Float
Ball Position Shown
At 4.5 L/min
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