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Vibrating Level Sensors

SX-LWTB Series

The SX-LWTB Series is a tuning fork level switch for reliable point-level detection of liquids and free-flowing solids. Piezoelectric elements excite the fork at its natural frequency; the electronics detect whether it is covered or uncovered. With no moving parts, it provides maintenance-free high- and low-level alarms and automatic level control.

Suitable Media: Liquids, slurries, aerated liquids, coating liquids, and free-flowing powders; solid particles smaller than 3 mm may also be detected.
Response / Start-up: Approximately 1 s response time; approximately 3 s start-up time.
Medium Density: Minimum 0.6 g/cm³.
Output: SPDT relay, DPDT, SPST, or PNP/NPN.
Power Supply: 24 VDC or 220 VAC; universal power-supply option available.
Process Connection: Threaded, flanged, or sanitary-clamp; custom configurations available on request.
Operating Pressure: Less than 2 MPa.
Wetted Materials: 304 stainless steel, 316L stainless steel, or stainless steel with PTFE coating.
Operating Temperature: Fork: −30 to +150 °C; instrument: −30 to +70 °C.
Switching Point / Delay: Approximately 25 mm when vertically inserted in water; optional 1–30 s delay.

$367.00

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Product Overview

The SX-LWTB Series is a tuning fork level switch designed for reliable point-level detection of liquids and free-flowing solids. Piezoelectric elements excite the fork at its natural frequency, while the electronics continuously monitor frequency changes as the fork is covered or uncovered by the process medium. With no moving parts, the series provides maintenance-free high- and low-level detection and automatic level control across a wide range of industrial applications.

Main Features

Reliable point-level detection for liquids and free-flowing solids.
Suitable for slurries, aerated liquids, coating liquids, and non-adhering powders.
Piezoelectric tuning-fork sensing with continuous frequency monitoring.
Reliable switching under agitation, turbulence, bubbles, and moderate viscosity.
High- and low-level alarms and automatic level-control functions.
No moving parts for maintenance-free operation.
Approx. 1 s response time and 3 s start-up time.
Minimum medium density of 0.6 g/cm³ and operating pressure below 2 MPa.
Fork operating temperature from −30 to +150 °C.
24 V DC, 220 V AC, and universal power-supply options.
SPDT, DPDT, SPST, and PNP/NPN outputs with optional 1–30 s switching delay.
304 stainless steel, 316L stainless steel, and PTFE-coated stainless-steel wetted materials.
Threaded, flanged, and sanitary-clamp process connections.
Standard, compact, high-temperature, corrosion-resistant single-rod, and extended single-rod configurations; side, top, or pipe mounting.

Product Application

Typical Applications

Liquids & Beverages	Process & Industrial Liquids	Solids & Hazardous Areas
Tap / mineral water level	Glue, dye, and wastewater level	Free-flowing solid powders
Beer and brewer’s yeast processing	Acid and alkaline solution level	Gas-generating liquid service
Beverage and diesel storage	Slurry and moderate-viscosity liquid level	Hazardous-area installations

Technical Data

Measurement
Product Type	Tuning Fork Level Switch
Sensing Principle	Piezoelectric elements excite the fork at its natural frequency; frequency changes indicate whether it is covered or uncovered
Detection Function	Point-level detection for liquids and free-flowing solids; high- and low-level alarms and automatic level control
Switching Point	Approximately 25 mm when vertically inserted in water
Minimum Medium Density	0.6 g/cm³
Power & Output
Supply Voltage	220 VAC / 24 VDC; universal power-supply option available
Output	SPDT relay, DPDT, SPST, or PNP/NPN
Contact Rating	One relay-contact output: 220 VAC / 3 A; 30 VDC / 3 A
Power Consumption	Less than 1 W
Electrical Interface	M20 × 1.5; cable outer diameter: 6–8 mm
Mechanical & Materials
Wetted Materials	304 stainless steel, 316L stainless steel, or stainless steel with PTFE coating
Process Connection	Threaded, flanged, and sanitary-clamp connections; custom configurations available on request
Installation	Side or top mounting; pipe installation for pump dry-run protection. Keep clear of incoming-material impact
Operating Pressure	Less than 2 MPa
Fork Configurations	Standard, compact short-fork, compact long-fork, high-temperature, corrosion-resistant single-rod, and extended single-rod
Insertion Depth	63 mm for compact short-fork; 135 mm for compact long-fork; 200 mm for single-rod type
Performance
Response Time	Approximately 1 s
Start-up Time	Approximately 3 s
Hysteresis	Approximately 3 mm
Switching Delay	Optional 1–30 s
Level Control	High- and low-level alarm and automatic level-control functions
Suitable Media	Most liquids with moderate viscosity and good flowability; free-flowing powders and solid particles smaller than 3 mm may also be detected
Application Limits	Not suitable for excessively high viscosity, particle diameter over 5 mm, vessel temperature over 150 °C, pressure over 2 MPa, or strong vessel vibration
Environmental Conditions
Fork Operating Temperature	−30 to +150 °C
Instrument Operating Temperature	−30 to +70 °C
Cable Routing	Keep sensor power and signal cables separate from high-power equipment cables; use 24 VDC where high-power or variable-frequency equipment is present when possible

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