Low cost ESMPE16 Optical Level switch Sensor monitoring for tank

 The photoelectric liquid level switch uses infrared detection, utilizing the principles of light refraction and reflection. Light will undergo reflection or refraction at the interface between two different media. When the liquid being measured is at a high level, a boundary is formed between the liquid and the photoelectric switch. When the liquid is at a low level, a boundary is formed between the air and the photoelectric switch. These two types of boundaries result in different intensities of reflected light received by the photoreceptor inside the switch, corresponding to two different switch states.

A. Extremely High Reliability and Longevity
No Mechanical Moving Parts: This is its biggest selling point. With no float, linkage, or magnet, it completely eliminates the risk of jamming, wear, mechanical fatigue, and other failures.
Maintenance-Free: Once installed, it usually requires no regular calibration or part replacement, making it suitable for long-term unattended equipment (such as outdoor base stations or deep-sea devices).
Vibration Resistant: Due to internal solidification, it has excellent vibration resistance, suitable for vehicular, marine, or high-vibration industrial pump and valve environments.

B. Outstanding Response Speed
Millisecond-Level Response: Optical signal transmission is extremely fast, with detection response time typically <1 second (even reaching milliseconds), much faster than the mechanical swing time of float switches.
Suitable for High-Speed Control: Ideal for occasions requiring rapid start and stop of pumps, such as precision dispensing machines, high-speed filling lines, or overflow protection.

C. Flexible Installation and Compact Design
Compact Size: Probe diameter can be as small as a few millimeters, with a compact overall structure, suitable for installation inside extremely narrow equipment spaces (such as robot vacuum water tanks or miniature medical pipelines).
Multi-Directional Installation: Supports top, side, and angled installation.
Top Mount: Detects high-level overflow or low water levels.
Side Mount: Detects specific liquid level points.
Multi-Point Series: Multiple photoelectric probes can be integrated on the same rod for multi-point liquid level monitoring (such as low, medium, and high-level alarms).

D. Wide Medium Compatibility
Unaffected by Density/Pressure: Detection is based on optical refraction, so changes in liquid density or pressure fluctuations in the container (within pressure tolerance) do not affect results.
Corrosion-Resistant Material Options: Probe housing can be made from stainless steel (304/316), polysulfone (PSU), PVDF, PTFE (Teflon), and other materials, capable of withstanding strong acids, strong alkalis, organic solvents, as well as high-temperature and high-pressure environments.
Food-Grade Safety: Easy to clean with no dead corners, compliant with FDA/EC1935 standards, widely used in the food, beverage, and pharmaceutical industries.

E. Intelligent Functions
Self-Diagnosis: High-end models feature LED status indicators or digital outputs to detect probe contamination, disconnection, or faults.
Delay and Debounce: Built-in circuitry filters bubble interference caused by liquid fluctuations, preventing false triggers.
Push-Pull/Analog Output: Some models not only provide switch signals (ON/OFF) but also output continuous analog signals for continuous liquid level monitoring.

1. Chemical and Pharmaceutical: Detect the liquid level of corrosive liquids such as acids, alkalis, and organic solvents. Since the probe can be made of stainless steel, polysulfone (PSU), or Teflon, it can resist strong corrosion and has no risk of mechanical jamming.
2. Water Treatment and Environmental Protection: Monitor the liquid level in sewage tanks and chemical solution barrels, and control the start and stop of pumps (linkage with dosing pumps or sewage pumps).
3. Mechanical Equipment Cooling Systems: Monitor the coolant or cutting fluid tanks of CNC machines, lasers, and generators. Alarm when the liquid level is too low to prevent equipment overheating.
4. Hydraulic and Lubrication Systems: Detect oil levels in tanks to ensure the normal operation of lubrication systems.
5. Small Storage Tanks and Pipelines: Suitable for places with limited space where large float switches cannot be installed (such as micro-reactors and precision dispensing machines).