Teledyne MX300 - Manual (Page 19)

Portable Oxygen Monitor Operating Instructions
Teledyne Analytical Instruments 11
3. Install 3 “AA” alkaline batteries into the holder as shown in Figure 2-
6. Each battery has its own slot. To insure proper polarity, place the
bottom (flat) or negative end of the battery in the end of the holder
marked “–”. Place the top (button) or positive end of the battery in the
end of the holder marked “+”. Do this for each battery.
Figure 2-6: Installing Batteries
4. Re-install the battery compartment door. When the unit is first turned
on, the screen will momentarily display all LCD segments. During
this period, diagnostic tests are being conducted to ensure that the
circuits are functioning correctly. The unit will activate the audible
and visual alarms for about 1 second. The LCD will flash
continuously indicating the unit is in the unlocked position ready for
calibration.
Note: When batteries are first installed or power is lost for any reason, the Monitor
defaults to the calibration mode. All keys except the CAL and ON/OFF (I/O)
keys will be inoperable until a successful calibration is achieved.
5. Note the battery display located below the oxygen readout display. It
continuously shows a bar graph of the remaining life to the batteries.
Using new batteries will illuminate all 5 segments from the left to the
right end of the bar. The bar graph indicator is continuously on when
the Monitor is powered on.
2.1.4 Calibration
The MX300 should be calibrated before each use and every 8 hours to
maintain accuracy.
When batteries are removed for any reason or when new batteries are in-
stalled, the Oxygen Monitor defaults to the calibration mode with the LCD dis-