Flow viscosity measurement device Model 458

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Overview
The Nomogram Disk Model 458 is a handheld conversion tool for translating viscosity measurement data between multiple unit systems and for adjusting values across reference temperatures. It integrates a viscosity nomogram and a temperature-dependent viscosity scale on a double-sided disk for direct, side-by-side comparison.

Conversion capabilities
The VISCOSITY NOMOGRAM converts viscosity data at reference temperatures between 15 °C and 25 °C into the following units:

• cSt = mm²·s⁻¹
• cP = mPa·s
• Engler degrees
• Krebs-Stormer units
• Gardner-Holdt units
• Efflux times
  • ISO 2431 (4 mm)
  • ASTM D 1200 (Ford No. 3, No. 4)
  • DIN 53 211

Temperature-dependent conversion
The TEMPERATURE-DEPENDENT VISCOSITY SCALE converts viscosity data for reference temperatures between 5 °C and 30 °C. Conversion is performed by reading adjacent scales rotated in opposite directions (slide-rule principle) and is based on a temperature coefficient of 5.5 %/°C.

Design and function
The two nomograms are combined on one disk that can be used from both sides. Direct comparison between different viscosity units is obtained via a simple indicator reading. Conversion between kinematic (cSt = mm²·s⁻¹) and dynamic (cP = mPa·s) units requires specification of liquid density in the range 0.7–1.5 g/cm³. Use of the nomograms assumes the tested liquids exhibit approximately Newtonian behaviour.

Scope of delivery

• Viscosity Nomogram and temperature-dependent Viscosity Scale, Model 458
• Case

Technical specifications

• Order number: 00990131
• Reference temperature range (nomogram): 15 °C – 25 °C
• Temperature-dependent scale range: 5 °C – 30 °C
• Temperature coefficient for conversion: 5.5 %/°C
• Density range for kinematic/dynamic conversion: 0.7 to 1.5 g/cm³
• Disk design: double-sided nomogram
• Intended liquids: approximate Newtonian behaviour
• Shipping: possible within three working days