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SECTION 2 TURBIDITY MEASUREMENT
2.1 Operating Controls and Indicators
Figure 4 shows the 2100P controls and indicators. Refer to SECTION 3
for a detailed description of each control and indicator.
Figure 4 Keyboard and Display with Descriptions
2.2 Turbidity Measurement
Measurements may be made with the signal average mode on or off and
in manual or automatic range selection mode. Using automatic range
selection is recommended. Signal averaging uses more power and
should be used only when the sample causes an unstable reading. Signal
averaging measures and averages ten measurements while displaying
2100P TURBIDIMETER
EDIT
DIAG
NTU
CAL?
POWER
MODE
CAL
DIAG
SIGNAL
AVERAGE
AUTO RNG SIG AVG
RANGE
READ
Indicates instrument is
in calibration mode
Indicates
recalibration may
be necessary
Indicates
measurement unit
is Nephelometric
Turbidity Unit
Displayed when
Signal Averaging
is on
Displayed when
instrument is in
automatic range
mode
Used to scroll
through diagnostic
and calibration
modes. Also scrolls
through numbers.
Turns signal
averaging function
on and off
Power switch to
turn instrument
on and off
Used to access and
exit calibration mode
Used to edit displayed
values and display
lamp-on values in
diagnostic mode
Constant display
indicates lamp is on;
flashing indicates
low light level
Flashes when battery
voltage level drops
below 4.4 volts
Negative sign for
some diagnostic values
Prompting indicator for
calibration sequence
Displayed when instrument
is in diagnostic mode
Four digit display
Indicates which
standard should be
measured when “S” is
displayed, and which
diagnostic code is
functional when
“DIAG” is displayed
Used to access and exit
diagnostic mode
Pressed to start measurement
Selects auto range or one of
three manual range modes
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