Advanced AC fan speed control - TK monitoring, gas flow control
SFPR4 series are three-phase transformer fan speed controllers with an output to control a gas valve. An air flow sensor or pressure relay is required to detect air flow. The output is activated simultaneously with the fan. In case air flow is not detected within 60 seconds after the motor is started, the gas valve output is deactivated. Local safety regulations often dictate that gas can only be supplied after the kitchen hood exhaust fan above the stove has been activated. This makes the SFPR4 series the ideal fan speed controller for industrial kitchen hoods! Their TK monitoring function deactivates the motor in case of overheating. They control three-phase voltage controllable motors up to 8 A. After a power failure, the motor will automatically restart.
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