Batch controller promises precise dispensing

24 May 2011

The new Endress+Hauser RA33 batch controller is said to provide precise sensing and dispensing of liquids into containers or process vessels in food, chemical, pharmaceutical, oil, gas and other process industry applications.

It monitors flow, temperature and density; controls valves and pumps; and dispenses the exact amount requested by the programmed recipe.

The controller works with a single valve and pump in automatic or manual mode, or with two valves for two-stage batching. Two RA33 controllers can work together for batch mixing of two ingredients.

The RA33 is able to calculate the exact volume to be dispensed based on an analogue or pulse signal from a flow sensor and its built-in temperature/density compensation functions. For example, mineral oils can be corrected according to the ASTM D1250-04 standard. The volumes of other media can be corrected using expansion coefficients, or the volume can be converted to mass by measuring the density. The RA33 makes an automatic after-run correction for constant and extremely accurate results, and advanced error diagnostics detect leakage, fill deviation and "no flow" conditions.

It has a compact housing for wall, panel or DIN rail mounting, making the device usable in a range of environments. It has an IP65-rated front panel, and the housing meets IP66 and NEMA 4X requirements.

The RA33 accepts inputs from flow, temperature, pressure and density sensors. Outputs can control two valves and two pumps, and it has up to four digital outputs for one- or two-stage valve control or for the control of other devices such as signal lamps. The RA33 also has optional USB, RS485, Ethernet, and Modbus TCP and RTU interfaces for communications with an external control system or PC.

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