YOKOGAWA TB830D, User Manual, Page: 53 / 85

< 7. Calibration >
7-2
IM 12E01B30-02EN 1st Edition : Mar. 08, 2023-00
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Turbidity manual calibration
Zero calibration ( “7.4 Zero Calibration”)
Adjust the reading to zero point. Update the Zero of calibration parameter.(A in Equation
7.1) Zero
Slope calibration (Check tool) (“7.6 Slope calibration (Check tool)”)
Update the Slope of calibration parameter (SL in Equation 7.1) by using Check tool.
Adjust the reading to pre-defined turbidity value of Check tool.
Be sure to perform after Zero calibration.
Slope calibration (Standard solution) (“7.7 Slope calibration (Standard solution)”)
Adjust the reading to arbitrary concentration value.
Update the Slope of calibration parameter (SL in Equation 7.1).
Be sure to do this after Zero calibration.
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Turbidity auto calibration
Auto zero calibration ( “7.8 Auto zero calibration”)
Zero calibration by feeding Zero water automatically.
Enable only when the converter setting of Automatic cleaning/Automatic zero calibration is
correct and the sampling system runs normally.
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Calibration others
Zero shift correction (“7.9 Zero shift correction”)
Update the Zero correction factor (B in Equation 7.2) using Zero water.
Sensitivity correction (“7.10 Sensitivity correction”)
Update the basic Sensitivity correction factor (K in Equation 7.2) by correcting to an arbitrary
sample value. Be sure to do this after Zero shift correction.
2 Points correction (“7.11 2 points correction”)
Update the Zero correction factor (B in Equation7.2) and Sensitivity correction factor (K in
Equation 7.2) all together, by using samples of two different concentration except for zero.
Reference sensitivity calibration (“7.12 Basic (reference) sensitivity calibration”)
Update the Reference sensitivity (S0 in Equation 7.1) which is an important parameter for
concentration calculation. Slope is initialized to 100 %. Usually this calibration is performed
only prior to factory shipment.
[Calibration status and calibration recovery status]
If you enter calibration’s screen from calibration menu without turning on the maintenance mode,
the turbidity meter enters calibration status and enters the maintenance contact and auto hold
target status. When calibration is finished or interrupted and the unit returns to the main screen,
contact status and mA hold status remain unchanged, and the flashes.
After confirming that the reading is normal, press the flashing to cancel calibration recovery
and return to measurement mode. When 1 hour has elapsed with calibration recovery state, the
measuring mode is automatically returned.