系列: LLC4

The LLC4 series combines resistance-sensing circuitry with solid-state timing to provide single-probe level maintenance. 在可调装置上，敏感度调节可实现精确的液位传感，同时忽略发泡剂和漂浮物。 Isolated 12 V ac is provided at the probe to prevent electrolysis. A trickle current of less than 1 mA determines the presence or absence of conductive liquid between the probe and common. The LLC4 series can be used with many types of low voltage (resistance changing) transducers to perform other control functions like temperature limit control, photo limit control, condensation sensing, and ice sensing. This unit features an industry standard, eight-pin octal plug connection.

工作原理

Drain (pump-down mode): When the liquid level rises and touches the probe, the time delay begins. This time delay prevents rapid cycling of the output relay and its load. At the end of the time delay, the output relay energizes and remains energized until the liquid level falls below the probe level. The output relay de-energizes and remains de-energized until the liquid rises and touches the probe.

Fill (pump-up mode): When the liquid level falls below the probe, the time delay begins. This time delay prevents rapid cycling of the output relay and its load. At the end of the time delay, the output relay energizes and remains energized until the liquid level rises and touches the probe. The output relay then de-energizes and remains de-energized until the liquid level again falls below the probe level.