Hach-Lange 2100P iso - Portable Turbidimeter Instrument - Manual (Page 26)

Page 26
Turbidity Measurement
4650098 measure.fm
Section 3, continued
5. Wipe off the excess
so that only a thin coat
of oil is left. Excess oil
may retain dirt and
contaminate the
instrument cell
compartment.
The cell should appear
nearly dry with little or
no visible oil.
Note: Soft, lint-free cloth
(velvet) works well for
oiling. Store the oiling cloth
with the sample cells and
keep it free of dirt. After a
few applications of oil, the
cloth will contain enough
residual oil that simply
wiping the cell with the
oiled cloth will provide a
sufficient oil coat on the
sample cell. Periodically,
add a small amount of oil to
the sample cell surface to
replenish the oil in the cloth.
6. Press:
I/O
. 7. Insert the sample
cell in the instrument
cell compartment so the
diamond or orientation
mark aligns with the
raised orientation mark
in front of the cell
compartment. Close
the lid.
8. Press:
RANGE
. Select
mannual or automatic
range mode.
9. Press:
SIGNAL
AVERAGE
.
10. Press:
READ
The display will show
the turbidity in FNU.
Record the turbidity
after the lamp symbol
turns off.
Note: The instrument defaults to the last operating mode
selected. If automatic range mode and signal averaging
were used on the previous measurements, these options will
automatically be selected for subsequent samples.
I
O
SIGNAL
AVERAGE
READ