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6820 /6920 (Single Optical Port): Calibration of these sondes can be done in the standard YSI

calibration cup. The correct calibration cup measures 7.5″ long. If your cup is shorter than this length,

then you should purchase the correct one or calibrate in your sensor guard.

6820 /6920 V2-2 (Two Optical Ports): All turbidity calibrations for the V2-2 sondes should be done in

the sensor guard. It is strongly recommended that you have a clean sensor guard or purchase a new spare

for this purpose (p/n 605295).

600OMS: The 600OMS sonde requires that all turbidity calibration points be done in the sensor guard.

It is recommended that one new sensor guard be purchased for the sole purpose of using it when

calibrating your OMS turbidity probe; order p/n 655264.

Warning: If the optional stainless steel sonde weight is going to be used, then the top surface (inside the

guard) must be painted flat black or colored black with an indelible marker.

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

Note: For the YSI prepared AMCO-AEPA standards, the value entered by the user during the

calibration protocol is DIFFERENT depending on which YSI turbidity sensor (6026 or 6136) is being

calibrated. The part numbers for the YSI standards and their calibration values are listed by probe

model number below.

YSI Part Number 6026 Value 6136 Value

608000 0 NTU 0 NTU

607200 10.0 NTU 12.7 NTU

607300 100.0 NTU 126.0 NTU

607400 800.0 NTU 1,000.0 NTU

ONE-POINT TURBIDITY CALIBRATION TO ELIMINATE NEGATIVE FIELD READINGS

YSI purposely allows its sondes to read negative data. When a sonde is deployed in clear water

environment and it reports negative turbidity, the cause is almost always connected to the zero

calibration. Despite best practices it is sometimes impossible to clean a sonde and the calibration

equipment to a point where the zero standard will not be contaminated by some small amount. This is

especially true when using previously deployed equipment. A brand new instrument can contaminate a

zero standard to 0.1 NTUs even in a lab environment. A cleaned but used sonde can contaminate a zero

standard to almost 1.0 NTU. If you have logged negative turbidity data, then you are most likely

experiencing this problem. Example: If the sonde is told that a 0.6 NTU liquid is zero, then this same

sonde is deployed in a 0.3 NTU environment the data will be recorded as -0.3 NTU. Knowing this, the

investigator can determine what error occurred and correct accordingly.

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