Model 3060e – Teledyne 3060e - Ultra Trace oxygen analyzer User Manual

Page 66

4-18

Model 3060E

Chapter 4

Teledyne Electronic Technologies

Analytical Instruments

25. The screen indicates

ZERO

LINE

PURGE

and directs you to open the MV1 valve
one division. When done, press

ACK

, and

the system will continue to step 26.

•

Open MV1 slowly until you see a fine
stream of nitrogen bubbles emerging
from the porous frit mounted at the
bottom of the Ultra Trace sensor. There
is no flow sensor on the electrolyte
sparging vent line to monitor flow. The
rate of sparging should be such that fine
nitrogen bubbles leave the electrolyte
without causing significant turbulence.

•

Initially, the sparger may be set to a
higher value however, when the oxygen
reading falls below 1 PPM you should
lower the sparging rate. The signal
noise level will depend on the electro-
lyte sparging rate. Electrolyte sparging
should never be completely stopped. If
the sparging is completely stopped, air
may diffuse back into the Ultra Trace
sensor through the sparger vent line and
interfere with measurements producing
very erratic output. The rate of sparging
at 100 to 50 PPB ranges should be
minimal and adjusted according to the
signal noise levels.

•

Typical expected noise level at the 50
PPB range is 0.5–1 PPB. However, the
noise level at the first start-up may be
1–2 PPB and may show some spiking
due to the presence of dissolved oxygen
in the electrolyte. The noise level,
magnitude, and frequency of the spikes
will diminish with time as the dissolved
oxygen is removed by sparging.

VALVES: ZERO LINE PURG E

O XYG EN = 5.0 PPM O 2
FLO W = 150.0 CC/M IN
G ENTLY O PEN M V1 1 DIVISIO N
--- PRESS ACK W HEN READY ---

ACK

ESC