Hach 2100Q User Manual

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
Calibration
verification (Verify
Cal) on page 18.
6.4 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 19 for more information. For accurate turbidity readings use
clean sample cells and remove air bubbles (degassing).
6.4.1 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.
• Remove sample cell and batteries from the instrument if the
instrument is stored for an extended time period (more than a month).
• Keep the sample compartment lid closed to prevent the entry of dust
and dirt.
Sample cells
• Always cap the sample cell to prevent spillage of the sample into the
instrument.
• Always use clean sample cells in good condition. Dirty, scratched or
damaged cells can cause inaccurate readings.
• Make sure that cold samples do not “fog” the sample cell.
• Store sample cells filled with distilled or deionized water and cap
tightly.
Measurement
• Measure samples immediately to prevent temperature changes and
settling. Before a measurement is taken, always make sure that the
sample is homogeneous throughout.
• Avoid sample dilution when possible.
• Avoid operation in direct sunlight.
English 11

Hach 2100Q Specifications

General

Range	0 - 1000 NTU
Resolution	0.01 NTU on lowest range
Detector	Silicon photodiode
Stray Light	< 0.02 NTU
Measurement Method	Nephelometry
Power Supply	4 AA alkaline batteries
Operating Temperature	0 to 50 °C
Storage Temperature	-20-60°C
Measurement Modes	Signal Averaging, Rapidly Settling Turbidity
Display	LCD
Accuracy	±2% of reading plus stray light from 0 to 1000 NTU
Light Source	Tungsten filament lamp