- The S90 Zahn Dip Viscosity Cup is an improved version of the time honored Zahn Signature Series Viscosity Cup.
- It is an all stainless steel calibrated Viscosity Dip Cup, and qualifies for certification under ANSI/NCSL Z540 or ISO/IEC 17025, ISO 9001, as applicable.
- GARDCO is the only producer authorized to use the Zahn name and has added the S90 designation to identify the improved viscosity cups manufactured on new state-of-the-art equipment to insure optimum quality and uniformity. Calibration of the S90 Zahn Dip Cup matches the earlier Zahn Signature Cup.
- Conversion formulas and tables relating flow cup efflux time in seconds to viscosity in centistokes are identical for both series of viscosity cups.
- S90 Zahn cups are calibrated with standard “G” series oils traceable to the National Institute of Standards & Technology (NIST).
- “G” series Canon calibration oils (standards) are produced in accordance with ISO 9002.
- NOTE: Efflux time from these viscosity cups does not meet ASTM specifications. Tables are available for converting S90 Zahn cup efflux time to EZ™ Zahn cup efflux time which complies with ASTM D4212.
- Viscosity Cup flow characteristics are defined by a mathematical formula and standard “G” series Canon Calibration oils.
- Furnished with each S90 Zahn dip cup is a conversion table relating cup efflux time to the nearest tenth of a second to viscosity in centistokes.
- S90 Zahn Viscosity cups, with the above advantages, cannot be confused with other, lesser defined cups as they are produced, calibrated and sold only by Paul N. Gardner Company and authorized dealers.
- Ransom & Randolph recommends the S90 Zahn Viscosity Cups as the most reliable viscosity cups to measure and control the consistency of ceramic shell slurries.
- S90 Zahn Dip cups do not meet ASTM Specification D4212. Not all S90 Zahn Cups deviate from the standard by the same amount – the range being from near compliance to a variance exceeding a factor of two. Manufacturing procedures include calibration with oils traceable to the National Institute of Standards and Technology (NIST). Certification with compliance to ANSI/NCSL Z540 or ISO/IEC 17025, ISO 9001, as applicable, is available at our Gardco Service Department. Tables are available which convert between S90 Zahn Signature and EZ™ cups of the same number, to the nearest tenth of a second, to assist those who need to work with both established standards.
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