Hach-Lange 2100Q and 2100Qis User Manual - Manual (Page 12)

Calibrate the turbidimeter with StablCal ® Standards
Note: For best accuracy use the same sample cell or four matched sample cells for
all readings during calibration. 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.
1. Push the
CALIBRATION key to
enter the Calibration
mode. Follow the
instructions on the
display.
Note: Gently invert
each standard before
inserting the standard. 2. Insert the 20 NTU
StablCal Standard and
close the lid.
Note: The standard to
be inserted is bordered. 3. Push Read. The
display shows
Stabilizing and then
shows the result.
4. Repeat Step 2 and
3 with the 100 NTU and
800 NTU StablCal
Standard.
Note: Push Done to
complete a 2 point
calibration. 5. Push Done to
review the calibration
details. 6. Push Store to save
the results.
After a calibration is
complete, the meter
automatically goes into
the Verify Cal mode.
Refer to
Verification
calibration .
Turbidity measurement
W A R N I N G
Potential explosion and fire hazard. This turbidimeter is designed for water based
samples. Do not measure solvent or combustible based samples.
Readings can be taken with the Normal reading mode, Signal Average
mode or in the Rapidly Settling Turbidity mode. Refer to
Reading modes
on page 17 for more information. For accurate turbidity readings use
clean sample cells and remove air bubbles (degassing).
Measurement notes
Proper measurement techniques are important in minimizing the effects
of instrument variation, stray light and air bubbles. Use the following
measurement notes for proper measurements.
Instrument
• Make sure that the meter is placed on a level, stationary surface
during the measurement.
Note: Do not hold the meter in the hand during measurement.
• Always close the sample compartment lid during measurement,
calibration and storage.
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