Hach TL2350 Manuel D'utilisation De Base page 13

5. Select an option.
Option Description
Add Date/Time Adds the date and time that the sample was collected to the sample ID (optional). The date
and time entered for each sample ID show on the Sample ID menu.
Add Number Adds a measurement number to the sample ID (optional). Select the first number used for
the measurement number (0 to 999).
The measurement number shows in parenthesis after the sample ID on the home screen.
Refer to
Add Color Adds a colored circle to the sample ID icon (optional). The sample ID icon shows before the
sample ID on the home screen. Refer to
6. Push OK>Close.
7. To edit a sample ID, select the sample ID and then push Options>Edit>OK.
8. To delete a sample ID, select the sample ID and then push Options>Delete>OK.
Note: To delete all sample ID's, select the sample ID and then push Options>Delete All Sample IDs>OK.
Calibrate the turbidimeter with StablCal Standards
Calibrate the turbidimeter before it is used for the first time using the StablCal sealed vial standards
provided.
Calibrate the turbidimeter at least every 3 months or as specified by the regulating authority when
data is used for USEPA reporting.
The instrument is ready for calibration 60 minutes after start-up. Keep the instrument on 24 hours a
day if the instrument is used regularly.
Note: Unknown results may occur if standards other than the recommended calibration points are used. The
recommended calibration points (< 0.1, 20, 200, 1000, 4000 and 7500 NTU) provide the best calibration accuracy.
Use of standards other than StablCal, or user-prepared formazin, may result in less accurate calibrations. The
manufacturer cannot guarantee the performance of the instrument if calibrated with co-polymer
styrenedivinylbenzene beads or other suspensions.
Calibration notes
• Make sure that the instrument is in the same ambient conditions as where it is used.
• 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.
• Clean the USEPA filter assembly before doing a primary calibration, or at least every 3 months
(which is the USEPA-recommended primary calibration interval).
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.
User interface and navigation on page 9.
User interface and navigation on page 9.
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