food processing 35
automatically lead to air savings, as these will normally users both time and cost, by removing the requirement
ensure zero-air use in their stable state. The traditional for sensor withdrawal, cleaning and recalibration. The
technique of process valve positioners incorporating non-breakable sensor also obviates the problems of
pneumatic flapper-nozzle systems means that air is being fracture with glass sensors; while its enamelled stainless
bled constantly, even when the valve is at rest. This can steel finish provides the highest levels of non-stick
average the equivalent of a 0.75kW (or one-horsepower) performance for maximised hygiene whilst pH values are
in compressed air for every ten to twenty valves in measured.
operation; a large process site can therefore be using a In common with the 8201, Burkert’s 8221 conductivity
vast amount of energy – unnecessarily. sensor is also designed for CIP, even during steam
Choosing the option of an embedded PID process sterilisation. This feature allows the sensor to provide the
controller, working in conjunction with the positioner, time and cost saving benefits of phase detection across
provides a fast-acting, decentralised control loop all transmitted mediums, including aggressive cleaning
in combination with the associated process sensor. agents. It also guarantees transparency of the process at
This arrangement also reduces complexity and saves all times, and protections for the user against expensive
unnecessary components and wiring. errors in respect of what fluids are being conveyed.
Where the problem is wastage rather than energy The ability of both the 8201 and 8221 units to stay
reduction, this can be improved greatly by accurate in place over long periods means that requirements for
monitoring of process fluids, using new, innovative recalibration become infrequent, decreasing manual
techniques of pH and conductivity measurement, as intervention and downtime. Moreover, there is the extra
provided by Burkert’s new 8201 and 8221 units. With assurance that wastage through process uncertainty or
probes made to the highest standards of surface finish, incorrect operator actions may become a thing of the
and with the use of glass-free, food quality materials, the past. Additionally, combining these types of sensors
opportunity now exists for measuring and controlling with a transmitter incorporating data-logging hardware
process lines during all phases of production and and software delivers the optimum in performance and
cleaning. An example of this is the robust, enamel-based product assurance. p
pH electrode on the 8201pH sensor, which is able to stay
in process, even during CIP purification. The ‘fit-and- Burkert Fluid Control Systems is based in Brimscombe, Stroud,
forget’ design of the 8201 pH measuring system saves Gloucestershire, UK. www.burkert.co.uk
Sweet solutions for cocoa & chocolate industry.
Bühler AG, Chocolate & Cocoa, CH-9240 Uzwil, Switzerland, T +41 955 11 11, F +41 955 35 82
sc.buz@buhlergroup.com, www.buhlergroup.com
BUH_SC_Ins_M_Image_08_121x185.indd 1
circle 35 or ✔ at www.scientistlive.com/efood
13.03.2009 15:23:30
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