YSI ProDSS - Manual (Page 45)

43
Calibration
Figure 54 Calibrate turbidity
Turbidity calibration 1-, 2- or 3-point
NOTE: The sensor guard must be installed for the turbidity sensor
calibration.
NOTE: When performing a turbidity calibration, the first point must
be zero.Select Calibration Value and enter 0.00.
1. Perform the Calibration setup (pH, ORP, ISE, conductivity, turbidity)
on page 33 . Rinse the sensor 2-3 times with a small amount of 0
FNU (NTU) standard.
2. Fill the calibration cup to fill line one of the calibration cup
(approximately 170 mLs) with 0 FNU (NTU) standard (clear
deionized or distilled water is suitable). Immerse the sensors into
the water.
3. Push the Cal key, then select Turbidity.
4. Select Calibration Value and enter 0.00.
5. Observe the data points readings for stability with the 0 FNU
(NTU) standard (white line on graph shows no significant change
for 40 seconds), then select Accept Calibration. “Ready for cal
point 2” will be displayed in the message area.
6. Select Finish Calibration to complete a 1-point calibration or
continue for the 2- or 3-point calibration.
7. Rinse the sensors, calibration cup, and sensor guard 2-3 times
with a small amount of standard #2. Discard the standard after
each rinse.
8. Fill the calibration cup to fill line 1 with standard #2. Immerse the
sensors in the second calibration standard.
9. Select Calibration Value and enter the value of the second
calibration standard.
10. Observe the actual measurement readings for stability (white line
on graph shows no significant change for 40 seconds), then select
Accept Calibration ( Figure 54 ). “Ready for cal point 3” will be
displayed in the message area.
11. Select Finish Calibration to complete a 2-point calibration or
continue for the 3-point calibration.
12. Rinse the sensors, calibration cup, and sensor guard 2-3 times
with a small amount of standard #3. Discard the standard after
each rinse.
13. Fill the calibration cup to fill line 1 with standard #3. Immerse the
sensors in the third calibration standard.
14. Select Calibration Value and enter the value of the third
calibration standard.
15. Observe the data points readings for stability, then select Finish
Calibration. “Calibration successful!” will be displayed in the
message area.
16. Rinse the sensors in clean water then dry.