YSI ProDSS - Manual (Page 44)

42
Calibration
Turbidity
Before performing the calibration, review “Calibration setup (pH, ORP, ISE, conductivity, turbidity)” on page 33 .
For proper calibration, you must use standards that have been prepared according to details in Standard Methods for
the Treatment of Water and Wastewater (Section 2130 B).
Acceptable standards include:
• AMCO-AEPA standards prepared specifically for the ProDSS turbidity sensor manufactured by YSI (YSI turbidity
standards)
• Formazin prepared according to Standard Methods, especially for calibration points greater than 1010
• Dilutions of 4000 FNU (NTU) formazin concentrate purchased from Hach
• Hach StablCal™ standards in various FNU (NTU) denominations
The use of standards other than those mentioned above will result in calibration errors and inaccurate field readings.
It is important to use the same type of standard for all calibration points. (i.e. do not mix formazine and AMCO-AEPA
standard for different points in a multi-point calibration).
Calibration limits
Because of the non-linear response of the turbidity sensor, calibration ranges may be limited. A 1-, 2- or 3-point
calibration can be completed using the following limits:
1-point 2-point 3-point
0-1 FNU (NTU) 5-200 FNU (NTU) 400-4200 FNU (NTU)
Calibration standards
The following standards are available for the ProDSS turbidity sensor:
608000 0 (all turbidity sensors); 1 gallon
607200 12.4 FNU (NTU) (ProDSS); 1 gallon
607300 124 FNU (NTU) (ProDSS); 1 gallon
607400 1010 FNU (NTU) (ProDSS); 1 gallon