HACH 2100P

HACH 2100P
HACH 2100P
StablCal Calibration
Calibration
Calibration of the 2100P Turbidimeter
is based on formazin, the primary
standard for turbidity. A formazin
recalibration should be performed at
least once every three months.
Hach Company only recommends the
use of StablCal® Stabilized Formazin
or formazin standards for the
calibration of Hach turbidimeters.
Prepare Sample Cells
1. Thoroughly clean the sample cell.
2. Apply a small bead of silicone oil from the
top to the bottom of the cell-- just enough to
coat the cell with a thin layer of oil.
3. Using a soft, lint-free cloth, spread the oil
uniformly, then wipe off the excess so that
only a thin coat of oil is left. The cell should
appear nearly dry with little or no visible oil.
Calibration with StablCal stds.
1. Slowly invert the sample cell 2-3 times.
2. Allow the standard to stand undisturbed for 2-3
minutes.
3. Prepare the vial for measurement using traditional
preparation techniques. This usually consists of
oiling the vial. This step will eliminate any optical
variations in the sample vial.
4. Let the vial stand for one minute. The standard is
now ready for use
Important Note: These instructions do not apply to
<0.1-NTU* StablCal Standards; <0.1NTU StablCal
Standards should NOT be shaken or inverted.
Calibration with StablCal stds.
1. use StablCal <0.1 NTU standard.
2. Insert the sample cell in the cell compartment aligning the
orientation mark on the cell with the mark on the front of
the cell compartment. Close the lid. Press I/O. Note:
Choose signal average mode option (on or off) before
pressing CAL – the SIGNAL AVERAGE key is not
functional in calibration mode.
3. Press: CAL. The CAL and S0 icons will be displayed (the 0
will flash). The 4-digit display will show the value of the S0
standard for the previous calibration. If the blank value was
forced to 0.0, the display will be blank (as shown). Press
→to get a numerical display.
Calibration with StablCal stds.
4. Press: READ. The instrument will count from 60 to 0, (67 to 0 if
signal average is on), read the blank and use it to calculate a
correction factor for the 20 NTU standard measurement. the
display will automatically increment to the next standard.
Remove the sample cell from the cell compartment.
5. The display will show the S1 (with the1 flashing) and 20 NTUor the
value of the S1 standard for the previous calibration. Insert the 20
NTU Stablcal std. sample cell into the cell compartment by
aligning the orientation mark on the cell with the mark on the
front of the cell compartment. Close the lid.
6. Press: READ The instrument will count from 60 to 0 (67 to 0 if
signal average is on), measure the turbidity and store the value.
The display will automatically increment to the next standard.
Remove the sample cell from the cell compartment.
Calibration with StablCal stds.
7. Follow the previous procedure in steps 5 and 6 for
the 100 NTU and 800 NTU StablCal stds. The
display will show the S2 (with the 2 flashing) for
the 100 NTU std and will show S3 (with the 3
flashing) for the 800 NTU std.
8. When the 800 NTU std is finished reading the display
will increment back to the S0 display. Remove the
sample cell from the cell compartment.
9. Press: CAL to accept the calibration. The
instrument will return to measurement mode
automatically. Calibration is complete.
Using Gelex® Secondary
Turbidity Standards
The instrument comes with Gelex Secondary
Standards which are particulate suspensions
similar to formazin primary standards in light
scattering characteristics. NTU values on the
Gelex standards indicate the range for which
they should be used. Due to minor variations in
glass and individual instrument optical systems,
the true value of the Gelex standards must be
determined against formazin in the same
instrument they will be used with for later
calibration checks.
Assigning Values to Gelex
Standards
1. Calibrate the instrument with StablCal Formazin standards.
2. Select automatic range mode using the RANGE key.
3. Thoroughly clean the outside of the Gelex vials and apply a thin
coating of silicone oil.
4. Place the 0-10 NTU Gelex standard in the cell compartment so
the diamond on the vial aligns with the orientation mark on the
instrument. Close the sample lid.
5. Press: READ. Record the displayed value, remove the vial from
the instrument and mark the value on the band near the top of
the vial.
6. Repeat step 3 through step 5 for the other Gelex standards, being
Careful to orient the cells properly.
Using Gelex® Secondary
Turbidity Standards
The 2100P Turbidimeter does not require formazin
calibration before every measurement as some
turbidimeters do but you need to check the instrument
calibration using the appropriate Gelex Secondary
Standard.
If the reading is not within 5% of the previously
established value, recalibrate the instrument with
StablCal Stabilized Formazin Primary Standard or
formazin primary standard
2100P Taking Readings
1. Collect a representative sample in a clean container. Fill a sample cell to the
line taking care to handle the sample cell by the top. Cap the cell.
2. Wipe the cell with a soft, lint-free cloth to remove water spots and
fingerprints.
3. Apply a thin film of silicone oil. Wipe with a soft cloth to obtain an even
film over the entire surface.
4. Press: I/O. The instrument will turn on. Place the instrument on a flat,
sturdy surface. Do not hold the instrument while making measurements.
5. 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. Close the lid.
6. Select automatic range selection by pressing the RANGE key. The display
will show AUTO RNG when the instrument is in automatic range
selection.
7. Select signal averaging mode by pressing the SIGNAL AVERAGE key.
The display will show SIG AVG when the instrument is using signal
averaging. Use signal average mode if the sample causes a noisy signal
(display changes constantly).
8. Press: READ The display will show - - - - NTU, then the turbidity in NTU.
Record the turbidity after the lamp symbol turns off.
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