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Turbidity Calibration 2-Point
NOTE:
The ProDSS Turbidity Sensor must be used with the Extended
Sensor Guard [Item# 626740] which is sold separately.
Turbidity calibrations, more than most other parameters, are susceptible to
interference from contamination. It is critical for calibrations to be performed with
very clean sensors, guards, and cups.
NOTE:
Calibration standards should not be re-used.
1.
Fill the graduated cylinder to the appropriate level with 0 FNU standard
(deionized water may be used as a substitute). The sensor guard must be
installed to ensure an accurate calibration. Make sure the guard is installed
and immerse the probe in the zero standard.
2.
Push the
Cal
key, then select
Turbidity
.
3.
Select
Calibration Value
and enter 0.00.
4.
Make sure there are no air bubbles on the turbidity sensor lens. If present,
lightly tap the guard against the cup to dislodge any bubbles. Observe
the actual measurement readings for stability (white line on graph
shows no significant change for 40 seconds), and then select
Accept
Calibration
. “Ready for cal point 2” will be displayed in the message area.
5.
Discard the used standard, and rinse the probe, guard, and graduated
cylinder with a small amount of the next calibration point standard.
Discard the rinse standard.
6.
Fill the graduated cylinder to the appropriate level with fresh standard for
the second calibration point. Immerse the probe in the standard.
7.
Select
Calibration Value
and enter the value of the second calibration
standard.
8.
Make sure there are no air bubbles on the turbidity sensor lens. Observe
the actual measurement readings for stability, and then select
Accept
Calibration
. “Ready for cal point 3” will be displayed in the message area.
9.
Select
Finish Calibration
to complete a 2-point calibration or continue for
the 3-point calibration.
Repeat steps 5 through 8 for a 3-point calibration. “Calibration successful!” will
be displayed in the message area. After calibration, rinse with water and dry the
probe.
Sensors, Calibration, and Maintenance
Turbidity Sensor Maintenance
Clean the sensing window with a non-abrasive, lint-free cloth. If necessary, use
mild soapy water.
The sensor can be stored wet or dry. For long-term storage, YSI recommends
storing the sensor dry. Install the shipping cap or sensor guard to prevent
scratches or damage to the optical sensing window.