U-shaped elevator liquid level sensor E3SGS30E4 Infrared photoelectric liquid-level sensor; 3-wire NPN normally open (NPN NO) proximity switch. Key benefits Reliable, non-contact detection: infrared photoelectric sensing detects the presence or absence of liquid without mechanical contact, reducing wear and maintenance. Easy integration: 3-wire NPN NO output provides a simple open/close signal compatible with PLCs, relays, and common elevator control systems. Space-efficient form factor: U-shaped design fits compact or constrained elevator components and simplifies mounting around guide rails or tank openings. Reduces downtime and risk: continuous, repeatable level detection helps prevent overflow, dry-run of pumps, and unexpected equipment failures. What it does and how it helps Function: continuously senses liquid level and outputs a clear NPN normally open signal when liquid is detected or removed. Problem solved: provides dependable level feedback for elevator hydraulic systems and associated tanks so control systems can act (stop pumps, trigger alarms, or switch valves) before faults develop. Operational advantage: non-contact infrared operation reduces false mechanical wear and delivers consistent switching behavior in regular elevator service conditions. Important attributes Model: E3SGS30E4 — U-shaped, infrared photoelectric sensor. Output type: 3-wire NPN, normally open (NPN NO) proximity switch for straightforward wiring to controllers and monitoring devices. Form factor: compact U-shaped housing designed for mounting in confined elevator equipment spaces. Performance: infrared photoelectric detection for fast, accurate presence/absence sensing and reliable signal transmission to control logic. Installation: three-conductor wiring (power, ground, output) simplifies connection and integration into existing elevator control panels. Practical use scenarios Hydraulic elevator reservoir monitoring: mount the sensor on the reservoir outlet or along the side to detect low-fluid conditions and prevent pump dry-run. Buffer or compensation tank level control: install in a compensation tank to provide an on/off signal for pumps or valves that maintain safe buffer levels. Preventive maintenance and automation: connect the E3SGS30E4 to a PLC or alarm system to trigger maintenance alerts, automate refilling sequences, or log level events for diagnostics. Why choose this sensor Direct, NPN NO output that fits common elevator control logic without additional signal converters. U-shaped design optimized for elevator component layouts where traditional straight sensors are difficult to mount. Infrared photoelectric sensing for dependable, non-contact detection of liquid presence or absence. Sensing behavior The E3SGS30E4 senses liquid level and provides a corresponding NPN normally open switching signal to downstream controllers or alarms, enabling immediate control actions or notifications.