Teledyne 6600 - Manual (Page 105)

Part III: 1-15
Oil in Water Part III
Teledyne Analytical Instruments
index between the ultra pure clean process zero water and air or N2 gas.
Signal level amplitude changes (usually <+/- 25%) will also occur, but their
ratio differences between gas and liquid remain very close also resulting in
close zero readings between gas and liquid.
Entering the zero offset
Determine the valve of the zero offset after field calibrating the unit using the
process fluid. Zero and span calibrate the unit as instructed in part III, sec-
tions 5.5 through 5.6.4. Once done, the zero sample in the cell is emptied
from the cell, dried and the reading recorded. Backflushing out the cell can
be done momentarily by commencing a normal autozero function from the
control unit as follows:
On the front panel of the control/analysis unit, operate the switches in the
following manner:
1 hit or scroll the switch labelled escape/enter to enter
display indi-
cates system
flashing
2 hit or scroll the switch labelled down/up to down once display indi-
cates span
flashing
hit again to down once display indi-
cates zero
flashing
3 hit enter once display indi-
cates select zero
manual or auto
4 hit down or up once if display not reading manual and flashing
5
hit enter once display indi-
cates “zero off”
and “ppm”
flashing
6 hit up or down to enter in offset value (oposite sign, + or -) determined
above between zero water and air or N2 backflush gas.
7 hit enter to start zero function; unit will
display air
purging flash-
ing
If in auto mode of unit proceed to calibrate the unit with the entered zero
offset value put in.
If in manual mode, proceed to calibrate the unit with the coarse and fine zero
adjustments as previously described in Part I, section 3.4.