Hach TL2310 Manuel D'utilisation De Base page 14

• 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.
• 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
StablCal RapidCal
(0–40 NTU)
StablCal (0–1000 NTU) Full-range calibration (<0.1 NTU, 20 NTU, 200 NTU, 1000 NTU) with
Formazin RapidCal
(0–40 NTU)
Formazin (0–1000
NTU)
SDVB (0–1000 NTU)
EU Pharm (0–30 NTU)
4. Select the remaining calibration options.
Option
Verify after Cal.
Calibration
Reminder
Reset to Factory
Calibration
6.2.3 Prepare the StablCal standards
When received and at intervals:
14 English
Description
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.
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.
Full-range calibration (20 NTU, 200 NTU, 1000 NTU and dilution
water) with formazin.
Full-range calibration (20 NTU, 200 NTU, 1000 NTU and dilution
water) with spherical styrene divinylbenzene.
Full-range calibration (<0.1 NTU, 3 NTU, 6 NTU, 18 NTU, 30 NTU).
Description
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.
Sets the time interval between calibrations. When a calibration is due, the
display will show a reminder and a question mark on the calibration icon at
the top of the display. Options: Off (default), 1 day, 7 days, 30 days or
90 days. When a calibration is done, the calibration time is set to zero.
Sets the calibration settings to the factory defaults.