The Brookfield Starch Viscosity Measurement System consists of a standard RVDV2T Viscometer (or RVDV3T Rheometer) with a Small Sample Adapter accessory and the unique TC112P Circulating Water Bath with two built-in cooling coils. The water bath uses "tap" water to circulate cooling water through the coils controlled by a solenoid valve.

The test procedure specifies that the bath is set at 90-95°C for the initial starch sample introduction into the Small Sample Adapter sample chamber. The viscometer is turned on and continuously measures the starch viscosity. Using the TC112P's Programmable Controller, a pre-selected time is set to start the cooling cycle, usually set to around 40-45°C. The larger of the baths two cooling coils is actuated and will cool the bath reservoir from the highest (90-95°C) to the lower set point in approximately 2.5 minutes. When the bath temperature approaches the lower temperature, the large cooling coil is closed and the secondary coil is opened to avoid temperature "overshoot". The Viscometer has been monitoring the starch samples' viscosity throughout the entire cooking, gelatinization, cooling and stabilizing cycles. Using RheocalcT Software simplifies the information gathering process and provides a visual starch "curve" as well as numerical data collection.

The difficulty with viscosity measurements of hot melts and liquids at elevated temperatures has been in maintaining accurate temperature control that is consistent from sample to sample so that meaningful data could be obtained. The Brookfield Thermosel solves this problem by providing a stable, precisely controlled sample environment. This, together with the inherent accuracy of the Brookfield Viscometers, is fundamental to the Thermosel System, which produces viscosity measurements that are not only accurate but entirely reproducible.

Several factors contribute to the stable environment :

Non-fluctuating temperature control. Small sample volume and insulated sample chamber which reduces temperature gradients within the sample. The rotating spindle, which acts as a built-in stirring device. The test procedure is quite straightforward. Once familiar with the system, unskilled operators can easily produce accurate, reproducible data.

The test procedure specifies that the bath is set at 90-95°C for the initial starch sample introduction into the Small Sample Adapter sample chamber. The viscometer is turned on and continuously measures the starch viscosity. Using the TC112P's Programmable Controller, a pre-selected time is set to start the cooling cycle, usually set to around 40-45°C. The larger of the baths two cooling coils is actuated and will cool the bath reservoir from the highest (90-95°C) to the lower set point in approximately 2.5 minutes. When the bath temperature approaches the lower temperature, the large cooling coil is closed and the secondary coil is opened to avoid temperature "overshoot". The Viscometer has been monitoring the starch samples' viscosity throughout the entire cooking, gelatinization, cooling and stabilizing cycles. Using RheocalcT Software simplifies the information gathering process and provides a visual starch "curve" as well as numerical data collection.

FEATURES BENEFITS :

• Provides control of sample temperature up to +300°C.

• Programmable Controller offers single set point or up to 10 programmable set points. Temperature ramping between set points is possible if used with RheocalcT Software.
Note : Requires optional cable HT-106 when QC control with RheocalcT is implemented.

• Compatible with standard Brookfield Viscometers and DV3T Rheometers
Note : requires optional cable DVP-141 when controlled by DV3T Rheometer.

• Supplied with reusable stainless steel sample container and five disposable aluminum sample chambers.

• Outputs : 0-4 Vdc for chart recorder; RS-232 for use with DV3T and/or RheocalcT.

DISPOSABLE SPINDLE/CHAMBERS OPTION

Thermosel System
Disposable sample chamber with Disposable Spindle SC4-27D* is ideal for asphalts or any difficult-to-clean material. Requires special adapter (SC4-DSY).
* Optional SC4-27D is available in quantities of 100, (SC4-27D-100).