W4 LEG Double Limit Monitor

The W4 LEG Double Limit Monitor supervises industrial process signals with dependable accuracy. It accepts standard analog inputs 0–10 V and 0(4)–20 mA, so it easily connects with level transmitters, pressure sensors, flow meters, and tank level generators. Because many plants operate mixed instrumentation, this wide compatibility reduces installation complexity.

Inside the unit, the monitoring circuit continuously compares the incoming signal against two independently adjustable limit points. When the measured value rises above the upper setpoint or drops below the lower setpoint, the relay activates instantly. As a result, operators receive early warning before overflow, dry-run, or abnormal process conditions develop. Moreover, the device stabilizes automation sequences by maintaining safe operating windows.

Its 20–253 VAC/DC universal power supply allows installation in panels worldwide without voltage converters. Therefore, maintenance teams can keep one spare model for multiple machines. DIN-rail mounting further simplifies panel assembly, and compact construction conserves cabinet space. In addition, clear adjustment controls help technicians configure thresholds quickly during commissioning.

Protection, Control & Automation Integration

The double relay output enables flexible control logic. One relay can trigger alarms, while the other controls pumps, valves, or contactors. Consequently, the monitor works both as a safety protection device and as a process controller.

Industrial environments often contain electrical noise; however, the W4 LEG monitor filters unstable signals and avoids nuisance switching. This improves equipment life because motors and solenoids no longer cycle unnecessarily. Furthermore, process uptime increases since operators respond to real conditions rather than false trips.

Water treatment plants, boiler feed systems, storage tanks, and chemical dosing stations benefit strongly from this unit. For example, it prevents tank overflow in filling systems and protects pumps against dry running in reservoirs. At the same time, automation engineers can integrate it into PLC panels for redundant safety monitoring.

Overall, the W4 LEG Double Limit Monitor provides accurate level supervision, dependable relay switching, and simple installation. Because it combines monitoring and control in one compact module, it becomes a practical and economical solution for modern industrial automation systems.

Technical Specification of gw4-leg-double-limit-monitor