4 Operation | Model 3000PA | |
|
|
|
|
|
|
|
|
|
4.4The 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
Although the instrument can be spanned using air, a span gas with a known oxygen concentration in the range of
20.9%, the cell can take longer to recover if the instrument is used for less than 1 % oxygen analysis immediately following calibration in air.
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 40 psig or less when turning it back on.
Readjust the gas pressure into the analyzer until the flowrate (as read on the analyzer’s SLPM flowmeter) settles between 0.5 and 2.4 SLPM (ap- proximately
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.Cell Failure
When the sensor in the 3000PA begins to fail, the analyzer will usually require more and more frequent calibration. If the 3000PA analysis readings drift downward uncharacteristically, try recalibration. If recalibration raises the readings temporarily, the cell may be failing.
You can check the output of the cell itself by going to the System function, selecting More, and pressing Enter. The cell output reading will be on the second line of the display.
Version
Cell Output: ### µA
The “good” reading depends on the class of cell your analyzer is using.
Teledyne Analytical Instruments |
