4 Operation
Model 3000MA
4-10
Teledyne Analytical Instruments
4.4
The
Span Functions
The analyzer is calibrated using span gas.
NOTE: Zero is not necessary for Percent (%) level measurements.
Additional information on Zero functions is provided in the
Appendix A-6 of this manual.
Although the instrument can be spanned using air, a span gas with a
known oxygen concentration in the range of 70–90% of full scale of the
range of interest is recommended.
Connect the calibration gases to the analyzer according to the instruc-
tions given in Section 3.4.1, Gas Connections, observing all the prescribed
precautions.
Shut off the gas pressure before connecting it to the analyzer, and
be sure to limit the pressure to 15 psig or less when turning it back on.
Readjust the gas pressure into the analyzer until the flowrate (as read on
the analyzer’s flowmeter) settles between 300-900 CC/MIN.
If you are using password protection, you will need to enter your
password to gain access to either of these functions. Follow the instructions
in section 4.3.3 to enter your password. Once you have gained clearance to
proceed, you can enter the
Zero
or
Span
function.
4.4.1 Span Cal
The
Span
button on the front panel is used to span calibrate the ana-
lyzer. Span calibration can be performed using the automatic mode, where
an internal algorithm compares consecutive readings from the sensor to
determine when the output matches the span gas concentration. Span cali-
bration can also be performed manual mode, where the operator determines
when the span concentration reading is acceptable and then manually exits
the function.
4.4.1.1
Auto Mode Spanning
Press
Span
to enter the span function. The screen that appears allows
you to select whether the span calibration is to be performed automatically or
manually. Use the
∆∆∆∆∆∇
arrow keys to toggle between
AUTO
and
MAN
span
settling. Stop when
AUTO
appears, blinking, on the display.
Span: Settling: AUTO
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