4 Heatpac Working Principle
Oil to be heated is fe d continuously to the
EHM heater. A temperature sensor in the
outlet senses the oil temperture and signals
the control unit. The control unit compares the
values received with the set parameter values.
The control unit then signals the power unit to
increase or decrease the electrical supply to the
heater as required.
The system temperature is monitored and
displayed in the control unit. If the preset alarm
levels are exceeded, an alarm indication is
given.
The Heatpac
®
EHS-71 system has a standard
safety function, comprising a high temperature
sensor (Pt100) located in the heater and
connected to an electronic temperature limiter
located in the power unit. A signal from this
equipment directly shuts off the heater, thus
protecting it from overheating. This equipment
works independently of the control unit.
The heating system is also inter locked with the
feed pump, so that the heater is stopped when
the pump is stopped.
A safety valve protects the heater from
excessive pressure.
17
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