• Make sure that the standards are at the same ambient temperature as the instrument before use.
• Use only the provided silicone oil. This silicone oil has the same refractive index as the vial glass
and masks minor glass differences and scratches.
• Store the oiling cloth in a plastic storage bag to keep the cloth clean.
• If power is lost during calibration, the new calibration data is lost and the last calibration data is
used.
• In Calibration mode, automatic range and signal averaging on are selected. When calibration is
completed, all operational modes go back to the last settings.
• All nephelometric (turbidity units of measure) calibrations are done at the same time.
• Ratio-on and Ratio-off calibration data is measured and recorded at the same time.
• The FNU values of StablCal standards and formazin standards are calculated using the
conversion factors of 1 FNU = 1 NTU.
6.2.2 Configure the calibration settings
Change the calibration settings as necessary before the instrument is calibrated. The instrument
must be calibrated when the calibration curve is changed.
1.
Push
Calibration
.
2.
Push
Options
>
Calibration Setup
.
3.
Select the calibration curve range and type of calibration standard.
Option
Description
StablCal RapidCal
(0–40 NTU)
Calibration with 20-NTU StablCal standard (default).
Note: The dark current in the instrument is used as the zero point of the
calibration curve. The calibration curve is linear from 0-40 NTU, thus low
turbidity measurements are very accurate.
StablCal (0–10000
NTU)
Full-range calibration (<0.1 NTU, 20 NTU, 200 NTU, 1000 NTU,
4000 NTU, 7500 NTU) with StablCal.
Formazin RapidCal
(0–40 NTU)
Calibration with 20-NTU formazin standard.
Note: The dark current in the instrument is used as the zero point of the
calibration curve. The calibration curve is linear from 0-40 NTU, thus low
turbidity measurements are very accurate.
Formazin (0–10000
NTU)
Full-range calibration (20 NTU, 200 NTU, 1000 NTU, 4000 NTU,
7500 NTU and dilution water) with formazin.
Degrees (0–100 mg/L)
Full-range calibration (20 mg/L, 100 mg/L and dilution water) with
kaolin.
SDVB (0–10000 NTU)
Full-range calibration (20 NTU, 200 NTU, 1000 NTU, 4000 NTU,
7500 NTU and dilution water) with spherical styrene divinylbenzene.
EU Pharm (0–30 NTU)
Full-range calibration (<0.1 NTU, 3 NTU, 6 NTU, 18 NTU, 30 NTU).
Custom Calibration
The user can enter a custom calibration for turbidity. The user selects
the number of calibration standards and the value of each calibration
standard. Use a custom calibration when smaller sample cells are
used with a sample cell adapter.
4.
Select the remaining calibration options.
Option
Description
Verify after Cal.
Sets the instrument to start a verification immediately after the instrument
is calibrated. When set to on, the verification standard is measured
immediately after a calibration is done. The value of the verification
standard shows on the display as the last standard during calibration.
14
English
Summary of Contents for TL2360
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