Teledyne 6600 - Manual (Page 41)

Oil in Water Analyzer Operation 3
Part I 3-17 Teledyne Analytical Instruments
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
Sample Cell settles between 50 to 500 cc/min (approximately 0.1 to 0.4
SCFH).
Note: Always keep the calibration gas flow as close to the flowrate of
the sample gas as possible
3.4.1 Zero Cal
The Zero function on the main menu is used to enter the zero calibration
function. Zero calibration can be performed in either the automatic or manual
mode.
Make sure the zero fluid is flowing to the instrument. If you get a CELL
CANNOT BE BALANCED message while zeroing skip to section 3.4.1.3.
3.4.1.1 Auto Mode Zeroing
Observe the precautions in sections 3.4 and 3.4.1, above. Enter the zero
function mode. The screen allows you to select whether the zero calibration is to
be performed automatically or manually. Use the
UP/DOWN switch to toggle
between AUTO and MAN zero settling. Stop when AUTO appears, blinking, on
the display.
Select zero
mode: AUTO
Enter to begin zeroing.
####.## ppm OIL
Slope=#.### C—Zero
The beginning zero level is shown in the upper left corner of the display. As
the zero reading settles, the screen displays and updates information on Slope=
in percent/second (unless the Slope starts within the acceptable zero range and
does not need to settle further). The system first does a coarse zero, shown in
the lower right corner of the screen as
C—Zero, for 3 min, and then does a fine
zero, and displays F—Zero, for 3 min.
Then, and whenever Slope is less than 0.01 for at least 12 sec, instead of
Slope you will see a countdown: 9 Left, 8 Left, and so fourth. These are