Brookfield Engineering

Starch

Laboratory Viscometer Application Data Sheet

Application

The SSB (Starch System Brookfield) monitors the viscosity of starches during automated quick-cook (gelatinization) and fast cool-down of starch samples. The SSB ensures that starch samples can be accurately tested and results known quickly so production adjustments can be made immediately.

Required Equipment

  • RVDV-II+ PRO Viscometer or RVDV-III Ultra Rheometer
  • Small Sample Adapter (SSA) accessory with SC4-27 Spindle and SC4-13RPY Sample Chamber with embedded RTD Temperature Probe
  • Model TC112P Circulating Bath with Programmable Controller
  • Optional Rheocalc® PC software for instrument control or Wingather® for data gathering and analysis

Test Method

The bath controls starch sample temperature through cooking and cooling stages. It is designed to rapidly cool down starch samples in less than 2 minutes from 95°C, the cooking temperature, to 45°C. The bath controller brings the sample to a pre-determined cook temperature, holds for a selected period of time and then changes to a pre-selected cooling temperature. A lab technician selects the appropriate time intervals for each cycle and programs this information into the controller. The bath requires a tap water source for cooling.

The viscometer constantly monitors the starch sample viscosity, from initial transfer of the sample to the SSA sample chamber, through the cooking, gelatinization, and cooling stages.

Test data (viscosity, temperature, shear stress, spindle speed and time interval) can be controlled manually, or by using optional data gathering equipment available from Brookfield: chart recorder, printer, Wingather™ (for Windows) software (or optionally, Rheocalc® for Windows if a DV-III Ultra Rheometer is used). A chart recorder will provide a graphical record which shows the development of a gel curve (viscosity and temperature). A printer will record both viscosity and temperature tabular data, thereby creating a permanent record. Wingather™ (or Rheocalc®) software gathers all test parameters and provides automatic “plotting” and tabular data storage.

Options

Rheocalc software allows the lab technician to control/program automatic changes in the shear rate during the test. A complete record of the test is captured using Brookfield's Rheocalc software. This option is suited for both detailed research applications and situations where the test execution needs to take place with minimal operator involvement.