IM-P402-72 AB Issue 6
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2. General product information
The Spirax Sarco LC2300 is used to control the positioner of a pneumatic valve in response to
a signal from a capacitance probe, providing proportional modulating control of liquid levels.
The LC2300 can also be used with any two-wire 4 - 20 mA transmitter, for example for pressure,
temperature, or level control using a pressure or differential pressure transmitter.
Reverse acting or direct output can be selected.
The controller has a mains on LED, and two level indicators:-
The green LED (>50%)
Indicates that the output current is greater than 50%,
i.e. above the set point output current.
The amber LED (>100% / < 0%)
Indicates that the output is greater than 20 mA
or less than 0 / 4 mA.
A three stage wave filter gives an averaged output, maintaining a stable signal under the very
wide variations in turbulence found in tanks and high output boilers.
The LC2300 is set up before installation to suit the mains supply voltage and to provide the
required functions, using internal switches. See Section 4.1, 'Setting up the controller'. Calibration
can be altered without removing or dismantling the unit, using the set point and proportional band
potentiometers on the front panel.
Fig. 1
Power on
Green LED
Amber LED
Set point
Proportional band
LC2300
>50%
>100%
<0%
Clamping screw
Clamping screw
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