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Tempering

Tempering water

Task

A reaction or agitator vessel must be filled with a specific, adjustable quantity of water. The flowing water must be controlled at a preset temperature.

Solution

The flowing water is tempered by means of a steam-heated heat exchanger. The temperature of the water is measured with a resistance thermometer at the outlet of the heat exchanger. The quantity of steam for heating the heat exchanger is set via a globe control valve. A positioner with an integrated process controller, which assumes the task of closed-loop temperature control, is attached to the control valve. The required water volume is dispensed by means of a flow sensor with an integrated dosing control system. The temperature control system and the dosing control system are activated at the start of a filling operation. The dosing control opens a pneumatically operated diaphragm valve. When the required water quantity is reached, the valve is closed again and the temperature control system is deactivated.