Servomex NanoTrace DF-760E, Instruction Manual

Page: 35 / 182

Installation, Start Up and Shut Down DF-760E 31
See the section on “Power Up Defaults on page 109 for setting user selectable preferences
at the time of power up.
4.2.4 Oxygen
Start the gas flow through the Oxygen Sensor by going to the Oxygen Controls Menu as
shown on page 72 and select Gas Valves. On the Gas Valves screen Figure 61, highlight
“Restore Process Gas Flow” and hit Apply, and then hit Done.
See the section on Gas Pressure and Flow Settings on page 29 for important information on
setting proper pressures and flow rates.
Allow the oxygen sensor to purge for 10 minutes before proceeding.
On initial start-up from the factory, the display will show “Sensor Off” indicating that the
oxygen sensor polarizing voltage is automatically turned off and must be manually turn on.
See page 72. Also, see the section on page 109 for further information on changing this
function on future power ups. After turning the oxygen sensor polarization voltage on, it
should take less than 5 minutes for the analyzer to come on scale (< 20ppm). The
concentration of oxygen is automatically shown in parts per million (ppm) or parts per
billion (ppb) on the display.
See the section on “Power Up Defaults” on page 109 for setting user selectable preferences
at the time of power up.
After analyzer start-up, the oxygen sensor can be used to check for leaks in plumbing
system. See page 120 for additional information.
NOTE
If oxygen is included in the background gas scale factor
calculation, the Oxygen sensor is automatically isolated. In
addition, no Zero adjustments will be possible using the internal
purifier on either the Oxygen or Moisture cells.
NOTE
Over-pressurizing the oxygen sensor can result in permanent
damage to the sensor. Limit the backpressure to the analyzer to
±1 psig.
4.2.5 Backflow Prevention System
It is imperative that flow be maintained through the analyzer. For this reason a flow
detection system is installed in the bypass loop to monitor the flow rate. In the event of
loss of sufficient flow the analyzer is automatically isolated to prevent ambient air from
contaminating the plumbing system. For additional information see page 106.