10279-D01-00
Page 134 of 142
This information is the property of Oshkosh Specialty Vehicles and is considered to be confidential. The contents may not be used, either
partially or wholly, for any purpose inconsistent with which it was produced. This information may not be reproduced or disclosed without prior
express consent.
Symptom
Why
What To Do
The oxygen reading
fluctuates or appears to
be incorrect. Continued:
Like all 02 sensors, the
R17MED detects the
changes in the partial
pressure of 02.
continued:
D) If a blender is used, check its
calibration.
A) Disconnect the batteries and
inspect the contacts for
corrosion. Reconnect the
batteries. If the unit functions
properly, calibrate the unit and
reset the alarm values.
B) Try a new set of batteries.
The unit has stopped
working and the LCD is
displaying alphanumeric
figures.
The MX300-I
instruments are
equipped with an
electronic "watch dog,"
which monitors the
circuitry within the unit
for potential faults and
renders the unit
inoperable until the
condition is corrected.
(See Watch dog
section below)
Several conditions can
activate the "watch
dog."
Dropping the unit, poor
battery connections,
and radio frequency
interference are the
most common causes.
See the watch dog
section for additional
information
C) Increase the distance
between the unit and any source
of radio frequency interference.
The sensor cable is a prime
source of pickup as it can act
like an antenna. Relocate the
sensor cable and if possible
change its coiled length to "de-
tune" its antenna effect.
Placing the cable in a different
position may also help.
Alarm sounds/flashes
continuously.
A) Readings are
outside alarm limits.
A) Adjust high and low alarm
setting to be above and below
the 02 value being displayed.
A) Batteries expired.
A) Check/replace batteries.
B) Check battery connections.
No display.
B) Bad battery
connection.
C) Calibrate.
Keys inoperable/cannot
turn unit off
The LOCK/UNLOCK
key is activated which
is preventing key
operation
A) Press LOCK/UNLOCK key
once. LCD will flash indicating
keys are active.
Cannot adjust calibration
or alarm settings
Critical settings require
two keys be pressed in
a specific order.
LOCK/UNLOCK key is
active
A) If display is not flashing press
lock key once to activate keys.
Press desired function followed
by the Up and Down key.
