Teledyne 320 Series - Portable oxygen detectors User Manual

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2-1

Teledyne Analytical Instruments

Operation and Maintenance

Portable Oxygen Detectors

Operation and Maintenance

2.1

Multiple Sampling Modes

2.1.1

Sampling By Diffusion

1. Mount the probe assembly in the probe holder on the side of the

unit. The sample flows over the probe, using the accessory
flow-through adapter (P/N A9689).

2. To sample remotely, remove the probe assembly from its holder

and extend the coiled probe cable up to six feet.

3. Use an accessory probe mounting bar (P/N A8657) to mount the

probe in a fixed position if the application warrants.

2.1.2

Sampling by Eduction (Model 320P)

1. Connect a piece of plastic tubing, such as Tygon, of 0.25 in inside

diameter, to the inlet port fitting with the other end connected to the
sample source.

2. Use the analyzer’s integral pump to educt the sample for analysis.

(Maximum vacuum is 60 in water column.)

NOTE: If the sample is at a positive pressure of 0.5 #/in2 or more, it is

not necessary to operate pump.

2.2

Cell Saver

A sealing cap is provided to keep oxygen from the cell when the instrument
is not in use. With the cell-saver cap in place, the cell slowly consumes the
trapped oxygen, and the output drops off towards zero. Overnight the
output will drop to less than 10% and will continue to drop as long as the
cell-saver cap remains in place.

The equilibrium oxygen level depends upon the integrity of the seals in the
probe assembly. The better the seals, the closer to zero the output will
drop. (The seals were designed to achieve an equilibrium of 2% or less.)

CAUTION:

If the instrument is used in a manner not specified
by TAI, the protection provided by the instrument
may be imapired.