Teledyne 3000 Ultra Trace - PPB oxygen analyzer - Manual (Page 34)

3 Installation Model Ultra Trace 3000
3-12 Teledyne Analytical Instruments
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 ana-
lyzer or somewhere within the users sample system.