Sugarequip Range of Supplies - page 38

We are pleased to advise that
has now constructed a twelve-compartment conductivity
transmitter, based on the well-proven ‘Recorder conductivity circuit’ from the
Auto-Pan /
Auto-Grain Batch Pan Instrument.
When the continuous pan was developed, namely the Tongaat-Hulett pan in particular, it was thought
that the feed of molasses to each compartment could be automated by measuring the electrical
conductance of the massecuite in that particular compartment.
This worked well on the Stork batch pan modified into a “six compartment continuous operation pan”
boiling C massecuites. However the conductivity measurement on a similarly modified Hulett batch
pan, boiling A massecuite, proved troublesome as ‘caked’ massecuite formed around the electrode
influencing the measurement.
It seemed reasonable that a similar problem would occur with B or C massecuites. Consequently it
was decided to adopt the route of the recently developed Radio Frequency - RF - capacitance /
resistance method to control the feed to these pans.
As this costly and fairly complicated RF measurement has also shown to cause similar problems with
probe fouling, it was decided to have another look at the cheaper and far less complicated
conductivity method for B and C massecuite continuous pans.
The results of these investigations proved that if the electrode was easy to remove for cleaning
purposes, conductivity measurement was as reliable as the RF one.
To the best of our knowledge the molasses feed to all B and C continuous pans in South Africa is
now achieved by means of conductivity measurement.
We are unsure of the history of the development of the molasses feed control on the FCB continuous
pans, apart from the fact that the original Boiling Point Elevation method has not been successful in
South Africa and has been replaced by either RF or Conductivity measurement.
DEVELOPMENT (Of 12 Compartment Instrument)
has for years been manufacturing and marketing the very successful
Batch Pan automatic pan boiling systems, the Auto-Pan and the Auto-Grain, based on conductivity
Presently some 250 of these systems have been supplied worldwide.
As the conductivity measuring circuit in the Auto-Pan has shown itself to be very accurate and
was asked by one leading sugar manufacturer in South Africa to
incorporate this conductivity measuring circuit design into a new instrument for a 12 cell continuous
The result of this newly developed instrument is a conductivity transmitter with twelve independent
measuring circuits each producing a 4 - 20 mAmp. DC output signal equivalent to a conductivity
range of 0 - 20 mmho conductance.
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