During the sugar production process, the juice is clarified within decantation tanks. Flocculants added to the solution improve the settling rate and the overall clarity of the sugar solution. Controlling the amount of flocculant is critical to the process: too high a concentration can contaminate the cleaned juice, creating additional production costs and loss of revenue.
The concentration within the decantation tank must be tightly controlled. The plant instrumentation engineers for this particular customer found that displacer transmitters required frequent cleaning, and measurements were neither accurate nor reliable.
The concentration was therefore being controlled manually by looking at the slurry through a tank window; this manual intervention was highly subjective and often led to wasted product.
- Elimination of manual level control
- Improved quality of final product
- Reduced production costs – less juice lost
- Reduced maintenance requirements
- Less wastage – reduced revenue loss
An MSM433 gap sensor was installed in the tank. Extensive experimentation found that the ideal angle was 30 degrees to the horizontal. The MSM400 controller drives the sensor, and the 4-20mA output is sent to a P.I. controller.
The output opens or closes a valve proportionally to achieve the required slurry concentration level. The higher the solids concentration in the slurry, the wider the valve opens. This system has been working for several years with excellent results, and is now used in sugar plants globally.
Figure 1 Application diagram of the process
For more information on Delta Mobrey’s MSM400, call your local sales office.
About Delta Mobrey
For more than 100 years, Delta Mobrey Limited has been a world-leading specialist in the design and manufacture of quality process instrumentation for the measurement and control of fluids and gases in all industrial plant and equipment.
Trusted quality – proven value: quality and reliability have always formed the cornerstone of our success, recognised by industry with international approvals covering every aspect of our manufacturing and product portfolio, together with certifications spanning all areas of hazardous and regulated environments.
Global team – local support: as a global organisation, Delta Mobrey is totally committed to delivering the best possible customer service and technical support, ensuring a lifetime value of ownership, together with a flexible and responsive approach to meet our customers’ individual demands.