Float, Level Sensors

Part Number	Description / PDF	Quantity
PLS-031A-3PPI PIC GmbH	MINIATURE LEVEL SENSOR	351
LLF78YNP Sensata Technologies – Cynergy3	FLOAT SWITCH 25VA PP NITRILE	0
S285-03	COOLANT LEVEL SWITCH 1/4" NPTF	50
LLC105100 SST Sensing	LIQUID LEVEL SENSOR	55
RSF76Y100TV Sensata Technologies – Cynergy3	FLOATSWITCH HORZ .6A NO/NC PPS	0
LLC102000 SST Sensing	LIQUID LEVEL SENSOR	458
RSF14Y100RF Sensata Technologies – Cynergy3	SENSOR LEVEL VERTICAL POLYPROP	0
LMC400 ifm Efector	BINARY LEVEL SENSOR; PNP/NPN; SW	0
RSF78Y100RM Sensata Technologies – Cynergy3	FLOATSWITCH HORZ .6A NO/NC NYLON	204
TLL151-5N-0500-01	FUEL LEVEL SENSOR, CUT-TO-LENGTH	24
SSV66A35B135SPM12 Sensata Technologies – Cynergy3	SD MNT DUAL SW PNT FLTSW M12	0
VP04E Carlo Gavazzi	LVL SEN OPTICAL NPN NO	5
LMC500 ifm Efector	BINARY LEVEL SENSOR; PNP/NPN; SW	0
SH-5653 Sensata Technologies – Cynergy3	3 FLGE MNT FLOATSWITCH	0
RSF104Y100JN Sensata Technologies – Cynergy3	VERTICAL, EXT MOUNT, N/O, 25VA	11
S298-202	COOLANT LEVEL SWITCH 1/4" NPTF	50
SSF67A25B175 Sensata Technologies – Cynergy3	SWITCH 2 LEVEL SS NO/NC .6A	0
BCS000Y Balluff	SENSOR LEVEL FLEX STRIP CAPAC	19
RSF166A25B125 Sensata Technologies – Cynergy3	DL PNT FLOATSWITCH 152MM TOTAL L	10
ILLS-G0750-D-010 Sensata Technologies – Cynergy3	SENSOR PRESSURE 0-7.5MWG 0.5-4.5	0

Float, Level Sensors

1. Overview

Float level sensors are electromechanical devices that measure liquid levels using buoyancy principles. They consist of a floating element mechanically linked to a sensing component, providing continuous or point-level detection. These sensors play a critical role in industrial automation, ensuring process efficiency, safety, and resource optimization across sectors like water treatment, energy, and manufacturing.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Magnetic Float Switches	Hermetically sealed contacts activated by float movement	Water tanks, fuel storage
Mechanical Lever Arm	Physical linkage translating float motion to potentiometer	Industrial boilers, hydraulic systems
Guided Tube Float	Float moves along a vertical tube, triggering reed switches	Chemical processing, corrosive environments
Optical Float Sensors	Combines float mechanism with infrared detection	Medical equipment, cleanrooms

3. Structure and Components

A typical float level sensor comprises: - Float Element: Hollow cylinder made of stainless steel, plastic, or titanium - Guide Mechanism: Rigid rod or cable for vertical movement guidance - Sensing Assembly: Reed switches, potentiometers, or Hall-effect sensors - Enclosure: IP65-rated housing with process connections (NPT, flanges) - Electrical Interface: Terminal block or industrial connectors (M12, etc.) The design ensures reliable operation in media with specific gravity 0.5 and temperatures up to 200 C.

4. Key Technical Specifications

Parameter	Description	Importance
Measurement Range	0.1 10 meters	Determines application suitability
Accuracy	1 3% FS	Process control reliability
Output Signal	4 20 mA, 0 10V, SPST	System integration capability
Environmental Temp.	-40 C to +85 C	Operational stability
Process Connection	1/2" 4" NPT, DIN	Installation compatibility
Material Compatibility	PVDF, SS316, EPDM	Chemical resistance

5. Application Fields

Water/Wastewater Treatment: Reservoir level monitoring
Oil & Gas: Crude oil storage tank level detection
Pharmaceuticals: Reactor vessel fill control
Power Generation: Cooling tower water level management
Food & Beverage: Syrup level detection in processing tanks

6. Leading Manufacturers and Products

Manufacturer	Key Product	Features
Siemens	Float Switch Series 8ME	ATEX-certified, 0.1% repeatability
Honeywell	LM Series Level Switches	316SS construction, SIL2 rated
TE Connectivity	Mini-Level Switch	Compact 6mm diameter design
Endress+Hauser	Prosonic M Float Switch	Dual-limit detection with IO-Link

7. Selection Recommendations

Key considerations include: - Media properties (corrosiveness, viscosity, density) - Required measurement range and resolution - Electrical requirements (analog/digital output) - Environmental conditions (vibration, ambient temperature) - Hazardous area classification (ATEX, IECEx) - Maintenance accessibility and calibration frequency

8. Industry Trends

Emerging developments include: - Integration with wireless communication protocols (WirelessHART) - Multiparameter sensors combining level, temperature, and pressure - Self-powered IoT-enabled devices using energy harvesting - Advanced materials for extreme pH environments - Smart diagnostics with predictive maintenance capabilities