Teledyne 320 Series - Portable oxygen detectors - Manual (Page 9)

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Teledyne Analytical Instruments
Operation and Maintenance Portable Oxygen Detectors
The cell is furnished in a controlled atmosphere package that extends its
useful life by a factor of 20. A spare cell can be stored without appreciably
shortening its useful life as long as the seal on the package is not broken.
NOTE: Orders for replacement cells must include the cell class. Refer
to the Specifications section below.
To install the new cell:
1. Remove probe assembly from the probe holder.
2. Unscrew the cap from the top of the probe assembly.
3. Place the cell in the probe with the terminal end of the cell facing
down towards the probe contacts.
4. Replace the probe cap.
NOTE: Be sure that the probe cap is tightened all the way down and
that the probe body is sealing on the gasket of the probe cap.
(Screw down the cap until resistance of the gasket is just felt
and then tighten an additional 1/8 turn.
2.5 2.5 2.5 2.5 2.5 External Output External Output External Output External Output External Output
A simultaneous voltage output signal is available to supplement the
detector’s integral meter. This permits indicating and/or recording the
oxygen level at a remote location.
TheModel 320A is provided with an external output of 0-1VDC. The
Models 320B, 320B/RC, and P are provided with an external output of 0–
100 mV dc unless otherwise requested at the time of purchase.
NOTE: Remote indicating and/or recording equipment must have a
minimum input impedance of 10K
Ω Ω Ω Ω Ω
. A self-balancing potenti-
ometer device is ideally suited to the detector output circuitry.
2.6 2.6 2.6 2.6 2.6 Accessory Flow-through Adapter (P/N A9689) Accessory Flow-through Adapter (P/N A9689) Accessory Flow-through Adapter (P/N A9689) Accessory Flow-through Adapter (P/N A9689) Accessory Flow-through Adapter (P/N A9689)
The flow-through adapter designed for the Series 320 Portable Oxygen
Analyzers has three hose connectors: two radially and one axially oriented.
NOTE: In the following instructions, the crossover point of 3 liters/
minute is not critical.
1. For flow rates less than 3 liters/minute use the axial connector as the
inlet. The axial inlet provides rapid purging of the dead volume at
relatively low flow rates.
NOTE At high flow rates, the axial inlet should not be used, since the
total pressure can be elevated and cause an erroneously high
oxygen reading.