Teledyne 3000TA-XLEU - Trace oxygen analyzer - Manual (Page 64)

Operation 3000TA-XL-EU
Teledyne Analytical Instruments 48
4.3.6 Version Screen
Move the ◄► arrow key to More and press Enter. With Version
blinking, press Enter. The screen displays the manufacturer, model, and
software version information.
4.4 Calibration of the Analyzer
The analyzer must be calibrated prior to its use. The following
sections describe how to calibrate the analyzer. If equipped with remote
calibration valves, the analyzer can be calibrated from a remote terminal
using the RS-232 port. See Section 3.3.2.3. In addition, web enabled
instruments can set calibration parameters including autocal programs as
well as initiate calibration events remotely from a computer if equipped
with remote calibration valves. See Section 5.2 for more details.
For most applications where the desired range of measurement is 0
to 1 ppm, we recommend the analyzer be calibrated using a span gas as
detailed below. For most applications, a zero calibration is unnecessary.
Span Gas Calibration
Before the cell is ready for calibration, it must be purged with
sample gas to low oxygen levels preferably below 0.2 ppm. However, if
the oxygen content of the sample gas is higher than 0.2 ppm, a zero gas
such as nitrogen with oxygen levels below 0.2 ppm may be required.
The recommended span gas concentration is between 7.0 to 9.0
ppm oxygen in nitrogen, and will require calibration be performed in the
0-10 ppm analyzer range.
Air Calibration
If desired, a newly installed cell may be calibrated in air to 209,000
ppm. However, this practice is generally not recommended as the cell
may take 24 hours or longer to recover to less than 0.2 ppm after being
exposed to air for about 3 to 5 minutes.
Note: The recovery time is significantly less, typically 30 minutes
or less, when the Insta-Trace sensor is used. Refer to
Section 3.4 for information on retrofitting your system to
use an Insta-Trace sensor.