3600 Analyzer for O
2
Measurement—Operator’s Manual 15
3600O2.OM.E9903
EXTERN. PRESSURE
0100 mbar
If this agrees with your current atmospheric reading, then press “ESC” to return to
the menu of interest. However, if you wish to re-calibrate, press “ENTER” to
select the method of calibration.
METHOD
ONE POINT
To calibrate, you have three menu choices:
• “One Point” which permits you to input one pressure value;
• “Two Point” which requires that you calibrate against high and low pressure
values (generally recommended only for high-pressure applications); and
• “Default” which lets the system make its own adjustments.
Use the “ñ” or “ò” buttons to highlight the desired method, and press “ENTER”.
Selecting “Default” causes the instrument to determine the calibration, then return
to the current atmospheric reading display, as shown above.
Activating “One Point” brings up this screen:
ONE POINT 0000
mbar ^
Note that you must enter the absolute (gauge plus atmospheric) pressure. Adjust
each digit with the “ñ” or “ò” key, and press “ENTER” to activate and return to
the “Extern. Pressure” display, as shown above.
The “Two Point” calibration method differs from “One Point” only by requiring
that a “high” and “low” pressure be applied and entered. While this is more time
consuming and is not usually required for precise measurement, it does offer an
additional parameter for the instrument to use for pressure compensations.
LOW POINT 0000
bar ^
The “Two Point” calibration method also requires that you enter the absolute
(gauge plus atmospheric) pressure for each point. Adjust each digit with the “ñ”
or “ò” key, and press “ENTER” to go to the high pressure screen:
HIGH POINT 0000
bar ^
Adjust each digit with the “ñ” or “ò” key, and press “ENTER” to save and return
to the “Extern. Pressure” display, as shown above.
During “Two Point” calibration, error messages are displayed if the sensor voltage
does not fall within a relatively narrow boundary of the expected voltage at both
points. (The possible error messages displayed are: “Pressure points too close”,
“Voltage points too close”, Bad slope”, or “Bad intercept”.) These messages mean
that either the sensor is not functional and should be replaced or repaired, or that
an error has been made in the calibration procedure. If these messages are
displayed, try repeating the two point calibration.
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