YSI provides secondary standards for turbidity calibration that utilize styrene-divinylbenzene copolymer beads. These solutions offer a stable alternative to the primary standard, formazin, since copolymer bead-based solution does not settle over time and does not need to be agitated before use.
For EXO and ProDSS Turbidity Sensors:
- Item# 607200 = 12.4 FNU
- Item# 607300 = 124 FNU
- Item# 607400 = 1010 FNU
Different turbidity sensors read secondary standards differently. This is primarily due to the differing size and configuration of the optics used in the respective sensor types. The YSI 6136 sensor contains larger optical components in a slightly different configuration than the EXO sensor. Thus, the 6136 sensor calibrates to a different turbidity value than the EXO sensor in the same secondary standard solution.
For YSI 6136 Turbidity Sensors:
- Item# 607200 = 14.2 FNU
- Item# 607300 = 121 FNU
- Item# 607400 = 934 FNU
Turbidity Standard Solutions come in 1-gallon plastic containers. During winter months, shipments must be made via 2-day or next-day carriers as these items are heat-packed.
Product Notification: The YSI Turbidity Standard formulation was updated in May 2024. Click here to read the full details of the update.
NOTE: This product can expire. See an expiration guide below.