Servomex NanoTrace DF-760E, Instruction Manual

Page: 76 / 182

72 DF-760E User Interface
7.6.1 Oxygen Controls Menu
Figure 60: Oxygen Controls Menu
7.6.1.1 Isolate Sensor
Isolate Sensor Sub-Routine – Selecting this option allows the oxygen sensor to be isolated
while maintaining moisture analyzer operation or other interruptions to the instrument.
7.6.1.2 Gas Valves
The oxygen gas valves control dialogue screen depicts a live indication of the gas flow
through the oxygen sensor in liters per minute. In addition, four options exist for gas valve
control.

Isolating the sensor closes the upstream and downstream valves for the oxygen
sensor. This is done to prevent contamination of the sensor when in transport or for
changing process lines.

Restoring process gas flow will open the upstream and downstream valves of the
oxygen sensor to allow for gas flow from the sample inlet for normal operation.

Restoring zero gas flow will divert the sample inlet flow through the gas purifier
and then through the oxygen sensor. Flowing the sample through the purifier is
necessary for performing zero calibrations or for assessing the purity level of the
incoming gas.

Restoring Span Gas Flow controls valves for span calibrations on the oxygen
sensor.
See Figure 118 on page 106 for additional information on the various gas valves and their
control.
7.6.1.3 Sensor On/Off
The oxygen sensor power can be toggled ON or OFF. The sensor ON command
applies the required polarizing voltage to the sensor. In addition, the analyzer is
programmed to protect the oxygen sensor from extended operation at high oxygen