TURBIDITY6136PROBECALIBRATIONTIPS
Note: The calibration of all YSI turbidity sensors must be done with either YSI distributed standards,
Hach StablCal, diluted Hach 4000 NTU Formazin, or standards that have been prepared according to the
instructions in Standard Methods (Section 2130B). Standards from other vendors are NOT
approved,
and their use will likely result in a bad calibration and incorrect field readings. Please refer to the
turbidity calibration section of your manual for more information.
BEFORE YOU BEGIN: Upgrade your sonde firmware to version 3.08 at www.ysi.com
SET UP & OPERATION
• Confirm that the wiper is parking correctly and reverses direction.
• Clean the optics of any fouling, fingerprints, etc.
• Low-turbidity water measurement accuracy can be improved by increasing the probe’s sampling
frequency. See the “Optimizing Turbidity Performance” section for specific instructions.
• Make sure that the back edges of all white turbidity wipers are painted black to eliminate any
stray light reflection.
• Calibrate 6600 in the long calibration cup (9.5 inch length) or use a clean sensor guard.
• Calibrate 6820 and 6920 (Single Optical Port) in the calibration cup.
• Calibrate 6820V2-2, 6920V2-2 and 600OMS sondes in the calibration cup but repeat the zero
with the guard installed. See Optimizing Turbidity Measurements section for more details.
CALIBRATION PROCESS
1. The first step is to confirm that the turbidity probe is functioning properly. Confirm that the
wiper parks correctly. It should be positioned at approximately 180° opposite the optics. The
wiper must reverse direction during the wipe cycle. The output of the probe must increase when
you place your finger in front of the optics. If the wiper does not park correctly or reverse
direction, then make sure that the underside of the wiper is clean and free of mud, sediment, or
other fouling. Replace the wiper or pad with a spare if needed. If the probe does not show an
increase in output or the wiper does not park correctly, then you must stop the calibration and
determine the cause of the problem.
2. Calibrating turbidity is best done in a lab environment; calibrations in the field can result in
errors. It is better to post-calibrate a sonde back in the lab than to attempt the calibration of an
optical probe in the field, especially if you are working out of a small boat or in less than clean
conditions.
3. Never use plastic or glass containers for your calibration unless the sensor guard is installed on
the sonde. Use of the supplied calibration/storage cup with its black endcap is strongly
recommended.
(continued)
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