The
function of the Walton electronic controller is to monitor the difference
between the system's actual temperature and the desired operating temperature.
When necessary, the controller sends instructions to the valve's actuator to
adjust the flow of coolant so as to bring the two into line as quickly as
possible.
The controller requires an input signal of the system's actual temperature. This is usually generated by a platinum resistance thermometer (PRT) which is installed in the system at the point where the temperature is to be sensed. The PRT converts the temperature into an electrical signal that the controller can recognise. Walton can supply PRTs suitable for most applications. Alternatively, a controller is available which responds to a 4-20mA signal; this can be generated by a wide range of devices.
The Walton electronic controller is available in the following configurations:
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Panel mounted This is installed in a control room's main console such that the controller's fascia is incorporated into a larger control system. The electronic parts of the controller are suspended beneath the control panel. |
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Totally enclosed In this design the controller is contained within an aluminium enclosure sealed to IP65. The fascia is accessed by removing the enclosure's cover. This arrangement is suitable for 'dirty' environments such as machinery spaces. Special enclosures are available for protection against sea water and other hostile environments. |
The controller's fascia incorporates a facility to set the desired system operating temperature, as well as integral, proportional band and dead zone controls.
The controller requires a power supply of either 220/240V or 110/120V AC 50/60Hz 1 phase.