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Weight sensors used in Phoenix chemical batching

2009-09-03 16:10   Article Source:N/A   View Times:
Phoenix Chemicals specialises in the safe handling and chemical batching of hazardous reactions using purpose-built continuous and semicontinuous reaction systems, and it uses Weight sensors for measurement.

Weight sensors image

Operating under GMP (good manufacturing practice), the company offers a custom manufacturing and process development service, supplying specialist organic intermediates to the fine chemical and pharmaceutical industry.

Phoenix chose to use Weight sensors for measurement as the company has multiple solvents in use and need a very accurate batching system for additions in the process.

These additions may be large or small as required by the formulation.

The weigh chemical batching equipment has to have the flexibility of a large measuring range and high accuracy.

Phoenix has previous experience of Thermo Nobel and has found both its equipment and services to be extremely reliable.

Thus, Thermo Nobel has been chosen to supply weighing systems that will enable Phoenix Chemicals to manufacture its products to this high specification.

As a company that designs and manufacturers both Weight sensors and associated instrumentation, Thermo Nobel has been able to offer a choice of Weight sensor specifications and weight controller/transmitter/controllers.

For its reactor weighing applications, Phoenix Chemicals has chosen to use the KIS-8 series of Weight sensors.

(The KIS-8 is an economically packaged KIS Weight sensor that offers performance benefits over conventional Weight sensors).

The cells have been selected based on the 'proven' performance in dynamic loading conditions that are particularly evident in reactor weighing applications.

These reactors are subject to both heating and agitation, which generates forces, such as side load, that are unwanted by the Weighing sensor when measuring weight.

When subjected to temperature cycling, the reactor expands and contracts.

In addition, the reactor agitator can be running and this creates a wave motion moving around the reactor.

The wave motion is transferred to the Weight sensor as a side load.

The severity of side load increases with speed and specific gravity of the product.

Selecting the KIS Weight sensor overcomes these fundamental conditions.

The KIS Weight sensor provides a stable and repeatable output even during these conditions.

Weigh batching additions can be made during both the heating and agitation phases without degradation of system accuracy.

Phoenix has chosen the TAD-3 intelligent weight controller fitted with chemical batching option.

The TAD-3 provides a panel mounted display of weight and batch status together with manual chemical batching capability.

The instrument provides two RS485 Modbus outputs, one of which is used to operate a remote relay interface module for process control and the other is used to communicate with the host computer/PLC.

A GATE-3 fieldbus convertor is used to convert the standard RS485 Modbus output to the company's preferred Profibus DP fieldbus.

For optimum chemical batching accuracy, the TAD-3 is being used for batching controller.

A recipe is sent serially to each TAD instrument.

After the receipt of a remote start command, the selected TAD will initiate each ingredient as required.

When the infeed of each ingredient has been completed, the TAD will carry out a tolerance check to ensure that the completed batch is within the required accuracy.

The batch information is then transmitted back to the host computer/PLC.

The TAD-3 controller provides good connectivity and the instruments were connected to the Phoenix.

Scada system without any interfacing problems.

Phoenix Chemicals has taken advantage of the KIS-8 series of the Weight sensors' unique characteristics coupled with the high specification TAD-3 weight controller to offer a cost effective reliable weighing solution to its production requirements.

Respective topics: Weight Sensors (Weighing Sensors)  
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