Teledyne 326, 327 and 328 - Oxygen analyzers User Manual

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Teledyne Analytical Instruments

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Section 4

4.3 Model 328RC Meter Adjustment (Electrical)

After turning on the instrument power, allow sufficient time for stabiliza-

tion. Connect a voltmeter (set to measure at least 1 V dc) between ground (-)
and TP1 (+). Turn the span control knob clockwise until the voltmeter reads
1.00 V dc. The analyzer’s indicating meter should read full scale; if it does
not, then adjust the meter trimmer (P1 on the motherboard) to correct it.

Cautions:

Cautions:Do not make any adjustments unless necessary.

Do not make any adjustments unless necessary.

Never attempt to make this adjustment with the power ON.

4.4 Measuring Cell Installation

The Micro-Fuel Cell is supplied separately in a controlled atmosphere

package, and must be installed prior to startup. It is particularly important
with Micro-Fuel Cells that the cell be left in its sealed bag until immediately
before the instrument is to be started up and a source of gas containing CO

is available. To install the cell, use the following procedure:

1) Make sure the range switch is in the OFF position.

2) Open the analysis and/or instrument enclosures, so as to expose

the analysis section components (sample tubing, measuring cell,
etc.)

3) Locate the cell holder assembly (plastic cylinder or metal block

with electrical cable coming out of one end and sample tubing at
the other end). Withdraw the cell probe from holder (use twisting
motion); remove cap by unscrewing counterclockwise.

4) Open the cell package and remove the shorting clip. Remove the

clip from the membrane end first, carefully, making sure not to
touch the sensor membrane.

Caution:

Caution: Never press on the sensor membrane.

Never press on the sensor membrane.

5) Place the Micro-Fuel Cell in the probe with the sensing surface

facing out and the printed circuit contacts (concentric gold rings)
facing the contacts inside the probe body. Replace cap removed
in step 3 (refer to instructions furnished in cell box).

6) Insert the cell probe back into the probe holder by pushing and

twisting slightly until it seats firmly.

Note:

Try to limit the amount of time the Micro-Fuel Cell is exposed to air.