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TurbiDirect_6 02/2019
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2.3.6 Calibration standards
The T-CAL standards purchased with the instrument should be used to calibrate the instrument.
It is possible to perform calibration with fresh dilutions of a Formazin Stock Solution. Using
dilutions of a Formazin Stock Solution it is recommended to calibrate and measure with an
indexed single vial or a set of matched vials.
2.3.6.1 T-CAL standards – correct storage and using
For optimum results when using T-CAL standards, adhere to the following recommenda-
tions:
Storing T-CAL standards
• T-CAL standards should always be stored in their original vial.
• Preferably store the vials upright.
• Store standards between 5 and 25°C.
• Avoid prolonged exposure to temperatures exceeding 35°C.
• Store away from direct sunlight.
• Always allow the standards to acclimatise to ambient instrument temperature before use
(not to exceed 35°C).
• T-CAL standards have a shelf life of 12 months if stored correctly.
Using of T-CAL Standards
Using < 0.1 NTU Standards
Caution: Never shake or invert this < 0.1 NTU standard.
• After delivery allow the vial to stand for at least 24 hours before use.
• If the standard has been shaken it can take several hours for all the bubbles to dissipate
and we suggest the vial is left for at least 24 hours as outlined above.
• If the standard has been inverted accidentally wait at least 15 minutes before using.
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After the countdown is finished the reading starts auto-
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Press [ ] key to store.
Pess [Esc] key to cancel the calibration.
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