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Trace Oxygen Analyzer Operation
Teledyne Analytical Instruments 55
current when using the current outputs) to represent a particular range.
The following table gives the range ID output for each analysis range:
Range Voltage (V) Current (mA)
LO 0.25 8
MED 0.50 12
HI 0.75 16
CAL (0-25%) 1.00 20
IMPORTANT: In the event of loss of flow through the analyzer, if the vent
is vented to a location of high oxygen content, oxygen will
back diffuse through the vent line and in most cases
quickly saturate the cell with oxygen which can then
require a quite long purge down time for the sensor when
then exposed to low oxygen concentrations. In the event
that flow is to be interrupted into the analyzer, it is
suggested that the user do one of the following:
1. Bag the sensor in nitrogen during this time
2. Install a shut off valve on the vent port of the
analyzer or somewhere within the users sample
system.