Teledyne 320 Series - Portable oxygen detectors - Manual (Page 10)

Teledyne Analytical Instruments
2-4
Model 320 Series Chapter 2
2. For flow rates greater than 3 liters/minute use one of the radial
connectors as the inlet.
2.7 2.7 2.7 2.7 2.7 Battery Charging (320P & B/RC only) Battery Charging (320P & B/RC only) Battery Charging (320P & B/RC only) Battery Charging (320P & B/RC only) Battery Charging (320P & B/RC only)
WARNING: Do not overcharge the batteries. WARNING: Do not overcharge the batteries. WARNING: Do not overcharge the batteries. WARNING: Do not overcharge the batteries. WARNING: Do not overcharge the batteries.
To charge the batteries:
1. Make certain that the selector switch is in the OFF position. The
batteries cannot be charged in any other switch position.
2. Connect the power cord to the instrument and connect to 115VAC,
50/60 Hz power.
NOTE An overnight charge (14 hours) should be enough for one
month of continuous operation. It will not damage the batteries
to charge them for up to 24 hours. However, the instrument
should not be stored with the batteries being charged.
2.8 2.8 2.8 2.8 2.8 Samples Containing CO Samples Containing CO Samples Containing CO Samples Containing CO Samples Containing CO
2 2 2 2 2
With samples that contain CO
2
, such as flue gas, the maximum sampling
time for any one sample taken is 5 minutes.
CAUTION Ensure that the sampling time is as short as possible. One
minute per sample is normally more than adequate.
Frequent sample exposure for more than five minutes will
shorten cell life.
After each sample exposure, set the range switch to the 0-25 % position.
(This is the HI position on the standard 320P.) Then purge the instrument
with air using the built-in pump.
In applications where intermittent samples are taken in one location, expose
the cell to air (20.9 % oxygen) until a constant reading is obtained. Then the
flow-through adapter can be removed.
Leave flow-through adapter off until next measurement is required. This is
done in lieu of purging the instrument with air. However, after final mea-
surements are taken, purge the instrument with air before replacing the
flow-through adapter.
Abnormally slow recovery to the air calibration point (5-30 minutes) is
characteristic of cells operated in CO
2
containing atmospheres for periods of
longer than five minutes.