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• All nephelometric (turbidity units of measure) calibrations are done at
the same time.
• Ratio-on and Ratio-off calibration data is measured and recorded at
the same time.
• The 7500-NTU standard does not have to be measured during
calibration if turbidity less than 4000 NTU will be measured. Push
StablCal calibration procedure
1. Remove the filter
2. Clean the lens of the
assembly. Refer to
USEPA filter assembly.
Change the filter
Refer to
assembly
on page 50.
assembly
14 English
3. Hold the tab of the
USEPA filter assembly
Clean the filter
so that the arrows point
on page 50.
toward the front of the
instrument. Push the
filter assembly fully in
the housing.
CAL/Zero after the 4000 NTU standard is measured to complete the
calibration procedure.
• Clean the USEPA filter assembly before doing a primary calibration,
or at least every 3 months (which is the USEPA-recommended
primary calibration interval).
4. Push CAL/Zero.
5. Get the < 0.1 NTU
vial. Clean the vial with
The CAL/Zero light
a soft, lint-free cloth to
turns on, and the mode
remove water spots and
display shows "00". The
fingerprints. Do not
NTU value of the
invert the vial.
dilution water that was
used in the previous
calibration is shown on
the display.
6. Apply a small bead
of silicone oil from the
top to the bottom of the
vial.
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