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Macromatic Industrial Controls

Located in Menomonee Falls, Wisconsin, Macromatic Industrial Controls engineers and manufactures industrial relays that control electrical processes and protects equipment from damaging or hazardous fault conditions. Macromatic provides solutions for almost any application in any industry. Macromatic’s products are used in the oil and gas, HVACR, pump control, material handling, irrigation, wastewater, mining, hoist, motor control, generator, lift and elevator industries and many more. As an independently-owned manufacturer of state-of-the-art control and monitoring products for over 40 years, Macromatic takes pride in its short lead-time, flexible product design, and exceptional technical support.

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Product Overview

LCP Series Liquid Level Control Relays detect & control levels of conductive liquids (tap water, seawater, sewage, chemical solutions, coffee, ice cream, etc.) in pump up or pump down applications. The conductive properties of the liquid complete a circuit between a probe & common when the liquid comes in contact with both.

These relays compare the value of the measured resistance between probes with the setpoint of the adjustable potentiometer provided on the product. The output of the relay is used to control pumps, solenoids or valves to lower, raise or maintain the level of the liquid in the tank. Probes are pulsed with a DC voltage to prevent potential electroplating issues.

LCP Series Single Probe
LCP Series Dual Probe
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Dual Probe Pump Up and Pump Down.jpg
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Pump Up (Fill): When the liquid level falls below the probe, a fixed time delay begins and the LED flashes Red.  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 the LED is Red ON. The pump is ON to fill the tank. The relay remains energized until the liquid level rises and touches the probe. The output relay de-energizes, turning off the pump, and remains de-energized and the LED is Green ON until the liquid level falls below the probe. 

Pump Down (Drain): When the liquid level rises and touches the probe, a fixed time delay begins and the LED fl ashes Red.  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 the LED is Red ON. The pump is ON to drain the tank. The relay remains energized until the liquid level falls below the probe level. The output relay de-energizes, turning off the pump, and remains de-energized and the LED is Green ON until the liquid level rises and touches the probe.

Pump Up (Fill): When the liquid level falls below the low level probe, a 1 second time delay begins and the LED flashes Red. At the end of the time delay, the output relay energizes and the LED is Red ON. The pump is ON to fill the tank. The relay remains energized until the liquid level rises and touches the high level probe. The output relay de-energizes, turning off the pump, and remains de-energized and the LED is Green ON until the liquid level again falls below the low level probe.

Pump Down (Drain): When the liquid level rises & touches the high level probe, a 1 second time delay begins and the LED flashes Red. At the end of the time delay, the output relay energizes and the LED is Red ON. The pump is ON to drain the tank. The relay remains energized until the liquid level falls below the low level probe. The output relay de-energizes, turning off the pump, and remains de-energized and the LED is Green ON until the liquid level rises and touches the high level probe.