Spectrasensors OXY5500, Operator'S Manual, Page: 59 / 140

Operation
OXY5500 Operator’s Manual 3
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25
At the top of the screen, the currently measured Oxygen, Temperature, and
Pressure values are displayed. Below this, the Old RATA Mult. value is shown.
Begin by setting the reference values.
1. Enter the reference oxygen value (oxygen concentration of certified
test gas lead into the vessel with the oxygen sensor, or the oxygen
value of a reference device) in the O2 Reference field (1) at the
bottom of the screen.
2. Press the Start button next to the New RATA Mult. field (2), as
shown in the Status field, to display current sensor phase values.
Wait while the sensor values stabilize until the Status field displays
“Ready to Set Value!” (3).
3. Press the Set button (4) next to the New RATA Mult. field and the
new value will display.
The New RATA Mult. can also be set manually. Refer to “Setting
New RATA Mult. Manually” on page 3-26.
4. Press the Save button at the upper right of the screen.
If RATA has not been changed, the display will read 1.000.
Figure 3–30 Relative Accuracy Test Audit (RATA)
Screen
2 1
3
4