Teledyne MD300 - Oxygen analyzer and monitor (Diving) - Manual (Page 18)

Operation AD300/MD300
Teledyne Analytical Instruments 18
Figure 2-7: Calibration Sequence
readout display, should show a bar graph of the remaining
life to the batteries. In the case of fresh batteries, it should
illuminate all 5 segments from the left to the right end of the
bar.
(AD300 only). The bar graph indicator is on continuously
whenever the instrument is powered on.
2.1.4 Calibration
The AD/MD300 should be
calibrated before each use.
Whenever new batteries are
installed or removed for any
reason, the oxygen monitor
defaults to the calibration mode
with the LCD display flashing
00.0. Only the CAL and ON/OFF
(I/O) keys are functional at this
point. On the MD300 monitor, the
alarm set points will also need to
be reset after calibration is
completed.
Note: For first time and for
routine maintenance
calibrations, make sure
the sensor and sensor cable are installed correctly before
attempting to calibrate the instrument
To calibrate the instrument (See Figure 2-7):
1. Turn the unit on by pressing the ON/OFF (I/O) key.
2. Check the batteries by pressing the BAT key.
3. If the LCD is not flashing, press the LOCK/UNLOCK key to
unlock the keys. LCD will flash indicating changes can be
made to the settings. If the batteries have just been installed
the LCD will flash 00.0
4. As with most oxygen analyzer(s) the highest level of
accuracy is achieved when calibration is conducted using
100% oxygen. After installing the flow diverter as noted in
Section 2.1.1, insert the sensor into the plastic tee and