Teledyne 2120XL - Trace Nitrogen Analyzer - Manual (Page 48)

Operation Model 2120XL
Teledyne Analytical Instruments 36
4.1 Powering Up the Analyzer
CAUTION: OZONE EMISSIONS ARE POSSIBLE IF AIR OR
MOISTURE ARE IONIZED IN THE SAMPLING
SYSTEM. THE SAMPLE PATH MUST BE
RELATIVELY FREE OF AIR AND/OR MOISTURE
BEFORE APPLYING THE IONIZING VOLTAGE.
KEEP THE POWER OFF UNTIL THE ANALYZER IS
FULLY PURGED.
1. Purge the analyzer and sampling system using the procedure
described in Section 3.7.
2. Connect the power cord to the proper power source for your
analyzer. The analyzer will begin its power up sequence
CAUTION: EQUIPMENT DAMAGE MAY RESULT IF THE
ANALYTICAL CELL IN THIS UNIT IS EXPOSED TO
EXCESSIVE PRESSURE, CAUSING IT TO BREAK OR
SHATTER.
3. Observe the display while allowing the instrument to warm
up and the readings stabilize. Drift occurs until internal
temperatures stabilize and the analytical cell is completely
purged. A persistent drift indicates an improperly purged
system or an air leak into the system.
4.2 Zero and Span Calibration
The Model 2120XL is designed to provide a linear response over
the 0-100 ppm concentration range for nitrogen in argon. Therefore, a
two-point (zero and span) calibration is sufficient to define the
calibration curve for this analyzer.
Prior to shipment, the analyzer was calibrated and linearized at the
factory in accordance with the calibration data shipped with your
analyzer. Use these settings to verify that the unit is in calibration, or re-
calibrate the analyzer as outlined in Section 4.5.2. Recalibrations are
required periodically. The user can also redefine the linearization curve
for this instrument. Refer to Section 4.5.1.12.