Liquid level control with three sensitivity ranges
The RM4LA32M is a liquid level control relay from the Harmony Relay RM4-L series, designed for detection by resistive probes in conductive liquid applications. It offers three selectable sensitivity scales: 0.25...5 kOhm (Low Sensitivity), 2.5...50 kOhm (Standard Sensitivity), and 25...500 kOhm (High Sensitivity), letting you match the probe circuit impedance to the fluid conductivity without external signal conditioning.
Output and timing flexibility
Two C/O (changeover) output contacts rated for switching up to 250 V AC, with a maximum switching voltage of 440 V AC. The adjustable time delay spans 0.1 to 10 seconds, giving you control over pump fill/drain sequencing or alarm debounce without an external timer module. The relay occupies 2.5 units of 9 mm pitch on a DIN rail — a 22.5 mm wide footprint that fits standard control panel layouts. Screw terminals accept 2 x 1.5 mm² flexible wire with ferrules or 2 x 2.5 mm² flexible without ferrules, with a tightening torque range of 5.3...9.7 lbf.in (0.6...1.1 N.m).