LS283 Capacitive Digital Liquid Level Switch
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Product Overview
The LS283 capacitive level switch is an intelligent sensor based on the capacitance measurement principle, specifically designed for industrial liquid level monitoring. Its core probe is made of high-temperature-resistant and corrosion-resistant PEEK material, combined with stainless steel 304 process connection, which can withstand medium temperatures ranging from -20°C to 85°C. It is suitable for harsh environments such as chemical, pharmaceutical, and food and beverage industries. The sensor precisely determines the liquid level status by detecting the change in capacitance value between the probe and the reference ground (such as the metal tank wall). When the medium covers the probe, the dielectric constant changes, causing a change in capacitance. The built-in microprocessor amplifies, filters, and linearizes the signal, and converts it into a set PNP/NPN switch output. The response time is less than 100ms. The product is equipped with a high-brightness LED digital display, which shows the current liquid level value or set parameters in real time. Through the panel buttons, the switch point, hysteresis (default 0.5%), and output mode (normally open/normally closed) can be conveniently adjusted. The integrated injection-molded housing has an IP67 protection level, with built-in anti-reverse, overload, and short-circuit protection, and provides M12x1 connectors for quick connection. It can meet the installation and reliability requirements of various industrial sites.
Core features summary
1. Outstanding corrosion and temperature resistance
The probe is made of PEEK material: it has excellent chemical corrosion resistance, hydrolysis resistance and high-temperature performance, and is suitable for harsh media environments such as acids, alkalis, solvents and high-temperature oils.
Wide temperature range design: the medium temperature range is -20...85°C, with strong environmental adaptability.
2. Highly flexible electrical configuration
Dual output adjustable: supports PNP and NPN output switching, and the normally open/normally closed (NO/NC) can be freely set, compatible with different PLCs and control circuits.
Intelligent protection: has reverse phase, overload and short circuit full protection to ensure stable system operation and reduce damage risks.
Fast response: response time less than 100ms, meeting the requirements of dynamic liquid level monitoring.
3. Reliable mechanical structure and protection
IP67 protection grade: the housing is waterproof and dustproof, suitable for industrial sites with dampness and dust.
Pressure and corrosion-resistant connection: the process connection uses stainless steel 304, sturdy and durable; the sealing parts can be selected from neoprene or fluororubber, compatible with different media.
4. Convenient installation and debugging
M12 connector: standard industrial interface, fast and reliable installation and wiring.
LED display: intuitive display of current liquid level status and set parameters, facilitating on-site debugging and fault troubleshooting.
Setting hysteresis: the default hysteresis of 0.5% can be adjusted, effectively avoiding output jitter and improving control accuracy.
| ◇Power supply voltage | twelve 30Vdc |
| ◇No-load current consumption | Maximum 30mA, 24Vdc power supply |
| ◇Output type | PNP/NPN configurable, normally open/normally closed configurable <200mA |
| ◇Switched load | <100ms |
| ◇Response time | The factory default hysteresis is 0.5% of the switch setting value (can be set) |
| ◇Switching point hysteresis | Reverse phase, overload, and short circuit protection |
| ◇Connection protection | twelve 30Vdc |
| ◇Temperature | Medium temperature: -20... 85°C Environmental temperature: -20... 80°C Storage temperature: -30... 80°C |
| ◇Material | Probe material: PEEK Process connection: Stainless steel 304 Sealing material: Nitrile rubber / Fluorine rubber |
| ◇Protection level | IP67 |
| ◇Outlet method | M12x1 Aviation plug |
Application fields
1. Chemical and petrochemical industries
Application scenarios: High and low liquid level alarms for storage tanks, reaction vessels, and intermediate buffer tanks; Liquid level control for acid and alkali tanks, solvent barrels.
Core functions:
Corrosion resistance monitoring: The probe is made of PEEK material, which can effectively resist the erosion of strong acids (such as sulfuric acid and hydrochloric acid), strong bases, and organic solvents, solving the problem of ordinary liquid level switches being easily damaged in corrosive liquids.
Precise control: Through LED digital display for on-site viewing of liquid level values, and by using the adjustable hysteresis (0.5%) function, it can prevent false actions caused by liquid level fluctuations, ensuring the stability of the dosing or drainage process.
2. Water treatment and environmental protection engineering
Application scenarios: Pure water/supersaturated water storage tanks, wastewater collection tanks, lift pump stations, chemical coagulation tanks.
Core functions:
High and low liquid level control: Adjustable between open and closed states, used to control the start and stop of pumps, enabling automatic water replenishment or drainage, preventing pump idling or water overflow.
Multi-environment adaptability: With IP67 protection level, it can be directly installed in damp, water-laden outdoor environments or underground pipe wells, without being affected by water vapor erosion.
High compatibility: Wide voltage supply (12-30Vdc) and PNP/NPN switchable output, capable of seamlessly integrating with various PLCs (programmable logic controllers) or industrial control systems.
3. Food and beverage, and pharmaceutical industries
Application scenarios: Beverage raw material tanks, CIP cleaning liquid storage tanks, pharmaceutical liquid preparation tanks, purified water storage tanks.
Core functions:
Hygiene and safety: The probe material PEEK and stainless steel 304 both comply with FDA (Food and Drug Administration) and food contact-related standards, with a smooth surface and no residue, making it less prone to bacterial growth.
Temperature and wash resistance: Can withstand a maximum medium temperature of 85°C and the high-temperature impact of CIP online cleaning (around 80°C), with a response time of <100ms, capable of quickly responding to liquid level changes during tank cleaning.
4. Mechanical processing and automotive manufacturing
Application scenarios: Machine tool cutting fluid tanks, lubrication stations, cleaning machine water tanks, engine test oil tanks.
Core functions:
Oil liquid monitoring: The PEEK probe has excellent chemical stability for oil-based media (cutting oil, hydraulic oil, lubricating oil), capable of accurately detecting the oil level, avoiding equipment wear due to lack of oil.
Strong anti-interference: Built-in anti-reverse, overload, and short-circuit protection, capable of withstanding voltage fluctuations and electromagnetic interference from large-power motor startups in the field, ensuring accurate signal output.
5. Hydraulic and lubrication systems
Application scenarios: Hydraulic station oil tanks, oil level monitoring for low-slip lubrication stations.
Core functions:
Compact installation: Small size combined with M12x1 connectors, suitable for installation on limited space hydraulic valve blocks or top/side of oil tanks.
Real-time alarm: Real-time monitoring of oil level through LED display, immediately outputting switch signals to trigger alarms or shutdown protection when the oil level is below or above the set threshold.
6. Semiconductor and photovoltaic manufacturing
Application scenarios: High-purity chemical reagent supply systems, cleaning tanks, developing solution tanks.
Core functions:
High purity application: PEEK material has extremely low metal ion release, not contaminating high-purity chemical reagents, meeting the strict cleanliness requirements of the semiconductor industry.
Leak prevention: Precise monitoring of tank liquid level, combined with rapid response, effectively preventing chemical spillage accidents and cost waste.
7. Mobile machinery equipment
Application scenarios: Construction machinery water tanks, fuel tanks, agricultural spray machine drug tanks.
Core functions:
Anti-vibration performance: Although the parameters are not directly stated, the integrated injection molding shell and compact structure enable it to withstand a certain degree of mechanical vibration.