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Macromatic’s LCP Series Liquid Level Control Relays detect and control levels of conductive liquids (tap water, seawater, sewage, chemical solutions, coffee, ice cream, etc.) in single probe pump up or pump down applications. The conductive properties of the liquid complete a circuit between a probe and 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. A built-in time delay prevents rapid cycling.
Controls Level of Conductive Liquids Pump Down (Drain) Applications
Single Probe Pump Down
Sensitivity Range 1K-250K Ohms
Timing Range: Fixed at 60 seconds
Probe is Pulsed with a DC Voltage to Prevent Electroplating
Factory-Fixed Time Delay of 1-60 Seconds Prevents Rapid Cycling
LED Status Indication
Uses industry-standard 8 pin octal socket
Pilot Duty Rating
10A @240 VAC/7A @ 28VDC
Temperature: –28°C to 65°C
Dimensions: 3.0" D × 1.7" W × 2.4" H
Description of Function:
Pump Down (Drain): When the liquid level rises & touches the probe, a fixed time delay begins & the LED flashes Red. This time delay prevents rapid cycling of the output relay & its load. At the end of the time delay, the output relay energizes & 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 & the LED is Green ON until the liquid level rises & touches the probe.