Float, Level Sensors

Part Number	Description / PDF	Quantity
S291-203	COOLANT LEVEL SWITCH 1/4" NPTF	50
SQ4-A22-P Panasonic	SENSOR FOR CHEMICAL LIQUID PNP	111
RSF57H100GB Sensata Technologies – Cynergy3	LEVEL SENSOR VERT SPNO 100VA PVD	0
SSF50X100X-C Sensata Technologies – Cynergy3	FLOAT SENS LIQ SPST-NC/NO .5A	1
SSF67B50B150 Sensata Technologies – Cynergy3	DL LVL FLOATSW 177MM TOTAL L	0
ILLSU-GI240-D-008 Sensata Technologies – Cynergy3	SENSOR PRES 0-240"WG 0.5-4.5V 8M	0
S286-03	OIL LEVEL SWITCH 1/4" NPTF	50
LR3300 ifm Efector	ELECTRONIC LEVEL SENSOR; PNP; SW	0
RSF166A50A150P Sensata Technologies – Cynergy3	DL PNT FLOATSWITCH 184MM TOTAL L	4
FM10-SMD11-NONO SMD Sensors	DUAL SWITCH 5" LONG 1" NPT, EXT	24
ILSEU-GI120-D Sensata Technologies – Cynergy3	SENSOR PRESSURE 0-120WG 0.5-4.5V	0
LR7000 ifm Efector	ELECTRONIC LEVEL SENSOR; PNP; SW	0
LM10AW Sensata Technologies – Cynergy3	CABLE FLOAT SPST-NO 10A	0
LS02-1A66-PA-500W Standex Electronics	SENSOR LEVEL FLOAT M10	379
A94-10 Carlo Gavazzi	LEVEL SENSOR CONDUCTIVE	9
SSF67A25B300 Sensata Technologies – Cynergy3	DL LVL FLOATSW 327MM TOTAL L	0
LLF69A198 Sensata Technologies – Cynergy3	FLOATSWITCH VERT .6A NC/NO PPS	0
LMT100 ifm Efector	ELECTRONIC LEVEL SENSOR; PNP/NPN	15
CTANK-M510 Digi	TANK LEVEL MONITOR M510	1
RSF107HVP Sensata Technologies – Cynergy3	LEVEL SENSOR HI TEMP VERT EXT PV	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