Teledyne 2010A - Split architecture thermal conductivity analyzer - Manual (Page 46)

4 Operation Model 2010A
4-12 Part I Teledyne Analytical Instruments
The analyzer is calibrated using reference, zero, and span gases. Gas
requirements are covered in detail in chapter 3, section 3.4 Gas Connections.
Check that calibration gases are connected to the analyzer according to the
instructions in section 3.4, observing all the prescribed precautions.
Note: Shut off the gas pressure before connecting it to the analyzer,
and be sure to limit pressure to 40 psig or less when turning it
back on.
Readjust the gas pressure into the analyzer until the flowrate through the
sensor settles between 50 to 200 cc/min (approximately 0.1 to 0.4 scfh).
Note: Always keep the zero calibration gases flow as close to the
flowrate of sample gas as possible
4.4.1 Zero Cal
The Zero button on the front panel is used to enter the zero calibration
function. Zero calibration can be performed in either the automatic or manual
mode.
CAUTION: If you are zeroing the Cal Range by itself (multiple
application analyzers only), use manual mode
zeroing.
If you want to calibrate ALL of the ranges at once
(multiple application analyzers only), use auto mode
zeroing in the Cal Range.
Make sure the zero gas is flowing to the instrument. If you get a CELL
CANNOT BE BALANCED message while zeroing skip to section 4.4.1.3.
4.4.1.1 Auto Mode Zeroing
Observe the precautions in sections 4.4 and 4.4.1, above. Press Zero to
enter the zero function mode. The screen allows you to select whether the zero
calibration is to be performed automatically or manually. Use the
Δ∇ arrow
keys to toggle between AUTO and MAN zero settling. Stop when AUTO
appears, blinking, on the display.
Select zero
mode: AUTO
Press Enter to begin zeroing.
####.## % H2 — N2
Slope=#.### C—Zero