8.3 Calibration
As each sensor has its unique characteristics, the transmitter is not calibrated to a sensor
by default (Cal. Point: No Cal). Calibration procedure must be performed by trained
personnel each time a new sensor is connected.
This instrument provides multi-point standard buffer solution calibration allowing
users to decide the number of points to calibrate against.
When calibrating, users can select the following tables for reference: Activated Sludge,
Digested Sludge, or Defined under Mode/Unit in setup mode (see section 7.4,
Measurement Mode/Unit).
During calibration, the reference value is recommended to not exceed 80% of the
factory set sensor measuring range (e.g. 40,000ppm for TS-MxS-A sensor)
For single point calibration, the reference value cannot be 0.
MLSS standard solution is not easily obtainable. The transmitter uses turbidity
standard solution to for MLSS calibration and corrects the measured value according
to a correction factor.
8.3.1 Known Solution Calibration
8.3.1.1 MLSS Calibration
During calibration, select MLSS unit from: mg/l or ppm
or select Turbidity units from: NTU, FTU, or FNU
MLSS and Turbidity calibration provides each 5 preset standard solution values for
selection:
MLSS:
40000, 20000, 10000, 5000, 500.0
Turbidity:
1000, 800, 100, 20.0, 1.00
If a turbidity unit is selected for calibration, the system will procced directly to
correction factor adjustment following standard solution calibration.
MLSS two-point calibration procedure is as follows:
Press or to
select the first point closest
to the known solution
value.
Press to confirm it.
Press to confirm it.
Press or to
select the unit.
Press or to
adjust the MLSS standard
solution value. Rinse the
sensor with distilled water
and place into the first
solution for measurement.
Press to confirm it.
Press to confirm it.
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