Thermal Conductivity Analyzer
Operation 4
4-11
Teledyne Analytical Instruments
The
OUTPUT
value is the output of the linearizer. It should be the ACTU-
AL concentration of the span gas being simulated.
If the
OUTPUT
value shown is not correct, the linearization must be
corrected. Press
ESCAPE
to return to the previous screen. Select and
EN-
TER
SET UP
to Calibration Mode screen.
Select algorithm
mode
:
AUTO
There are two ways to linearize:
AUTO
and
MANUAL
: The auto mode
requires as many calibration gases as there will be correction points along the
curve. The user decides on the number of points, based on the precision re-
quired.
The manual mode only requires entering the values for each correction
point into the microprocessor via the front panel buttons. Again, the number of
points required is determined by the user.
4.4
The
Zero and Span Functions
(1) The Model 2000 can have as many as three analysis ranges plus a
special calibration range (Cal Range); and the analysis ranges, if more than one,
may be programmed for separate or identical gas applications.
(2) If all ranges are for the same application, then you will not need the Cal
Range. Calibrating any one of the ranges will automatically calibrate the others.
(3) If: a) each range is programmed for a different gas application, b) your
sensor calibration has drifted less than 10 %, and c) your Cal Range was cali-
brated along with your other ranges when last calibrated, then you can use the
Cal Range to calibrate all applications ranges at once.
If your Model 2000 analyzer fits the paragraph (3) description, above, use
the Cal Range. If your analyzer has drifted more than 10 %, calibrate each range
individually.
CAUTION: Always allow 4-5 hours warm-up time before calibrat-
ing, if your analyzer has been disconnected from its
power source. This does not apply if the analyzer
was plugged in but was in STANDBY.
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.