Reading Modes; Maintenance; Rapidly Settling - Hach 2100A User Manual

1. Push the 2. Insert the 20 NTU
CALIBRATION StablCal Standard and
key to
close the lid.
enter the Calibration
Note: The standard to
mode. Follow the
be inserted is bordered.
instructions on the
display.
Note: Gently invert each
standard before
inserting the standard.
4. Repeat Step 2 and 3 5. Push Done to review
with the 100 NTU and the calibration details.
800 NTU StablCal
Standard.
Note: Push Done to
complete a 2 point
calibration.
10 English

Reading modes

1. Push the UP or DOWN key to enter the Reading Options menu.
2. Select Reading Mode to select one of the following options:
3. Push Read. The
display shows
Stabilizing and then
shows the result.
6. Push Store to save
the results.
After a calibration is
complete, the meter
automatically goes into
the Verify Cal mode. For
additional information,

Maintenance

refer to the CD for an
expanded version of this
manual.
Personal injury hazard. Only qualified personnel should conduct the tasks
described in this section of the manual.
Option Description
Normal (Default The normal mode reads and averages three readings.
setting) The result is shown after the reading.
Signal Average The Signal Average mode compensates for reading
fluctuations caused by drifting of sample particles
through the light path.
The X-bar icon is shown on the display when signal
averaging is on.
The Signal Average mode measures 12 times and starts
to show the average after three readings. The final result
is the average of all 12 readings.

Rapidly Settling

The Rapidly Settling Turbidity (RST) mode calculates
™
Turbidity (RST) and continuously updates the turbidity reading of the
sample to a confidence of 95%, based on the
accumulated trend of the real time measured values.
The RST mode is best used on samples that settle
rapidly and continuously change in value. The reading
is based on a correctly prepared sample that is
homogeneous at the beginning of the reading. It is best
applied to samples that are greater than 20 NTU. The
sample must be mixed thoroughly by inversion
immediately before inserting it into the meter.
The target icon is shown on the display when the Rapidly
Settling Turbidity is on.
The Rapidly Settling Turbidity reads and calculates five
readings while showing intermediate results.
C A U T I O N