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The oil is heated by steam (although thermal oil or electric
heaters are used on other systems). The temperature of the
oil is controlled by a viscosity measuring device. The
viscosity must be maintained at the correct level for
injection. On this particular system it is set at 16
Centistokes.
The viscosity
controller in this particular case is an electronic device.
It measures the damping of a vibration signal. The more
viscous the fuel the less the vibration is damped.
The output from this
signal is sent to the heater control valve.
