14
DIGITAL DISPLAY READOUTS
The digital display shows a primary and precise digital number readout for the % N
2
O
concentration setting on the left side and the Total Flow in L/min on the right side.
♦
To increase the Nitrous concentration, turn the % N
2
O knob counter-clockwise. The
display will change in increments of 5%. To decrease the Nitrous concentration, turn the
% N
2
O knob clockwise.
♦
To increase Oxygen / total flow, turn the Total Flow knob counter-clockwise. The display
will change in increments of 0.5 L/min. To decrease the oxygen / total flow, turn the knob
clockwise.
The following table defines the various display conditions and their meanings.
Display / Condition
Meaning
User Action
Display is Blank
1) Unit’s switch is in the
STANDBY (Off) position.
2) Power outage /
interrupted.
Note:
The restart from the
power outage restores the
display of % N
2
O and Total
Flow to the same as before
the outage.
1) Turn On / Standby Switch to the
ON position.
2) Flowmeter will continue to
deliver the same mixture during a
power outage but will not display
the digital readout for % N
2
O and
Total Flow during the outage. Refer
to
Usage During Power Outage
.
PORTER
Digital Display
N2O / O2 MXR
Model No.
SN-(Serial No. of Unit)
Ed Mixer Version
Check Sum
Initial sequence upon a
power up of power supply.
(On / Standby Switch turned
ON is not a power up.)
To see initial sequence: Power
down (unplug); wait 1 minute;
power up.
Note:
The serial number of the unit
will display when the unit is
powered up.
Self-Check Error,
Service is Required
Self-checks are performed at
start up and during operation.
Unit is not useable possibly
due to a bad checksum or a
failed voltage reference test.
If this continues to display, contact
your Porter dealer. Turn On /
Standby switch to STANDBY (Off)
and remove flowmeter for servicing.
%N2O L/M
There is no Oxygen flowing.
There is no Nitrous flowing.
%N2O and Total Flow valves
are shut tightly.
Normal display condition for no
flows.
High Flow Mode
Display will also flash
50(60)% N2O Max.
Audible alarm will sound.
The unit is flowing Total Flow
above 14 L/min.
Turn the Total Flow knob clockwise
to reduce flowrate until below 14
L/min.
O2 Flow
%N2O
[
is blank
]
6 L/M
Oxygen is flowing 6 L/min
only. There is no Nitrous
flowing.
Normal display condition for
Oxygen only flows.