Tuning Fork Level Switch

Overview

The tuning fork level switch is a new type of level limit switch. The tuning fork is excited by a crystal to generate vibration. When the tuning fork is immersed in material, the vibration frequency changes. This frequency change is detected by electronic circuits, which control a DPDT relay (double-pole double-throw) and current output to achieve level detection. The tuning fork level switch is widely used in industries such as petrochemicals, light industry, food, and water treatment for material presence/absence (high/low level) alarm and control.

Product Features

² Robust and durable: The tuning fork head is composed of a sturdy stainless steel shell and alloy casting.

² Strong applicability: Suitable for point-level alarm or control of solid materials in various silos and liquid levels in various containers.

² Maintenance-free: Since the detection process of the tuning fork level switch is completed by electronic circuits and has no moving parts, it requires no maintenance once installed and put into use.

² Longer lifespan: Using the instrument's built-in shorting device to control material presence/absence (high/low level) alarm keeps the relay in a released state for extended periods, thereby extending the instrument's lifespan and reducing power consumption.

² Current output: One set of current output; when material contacts the fork, the output current is 0mA; when material leaves the fork, the current is 10mA.

Application Range

Solid materials: Rice, milk powder, sugar, salt, laundry detergent, dye, cement, stone powder, plastic pellets, etc.

Liquid media: Water, slurry, pulp, dye, oil, milk, alcohol, beverages, etc. (non-viscous materials).

The instrument has no moving parts and features corrosion resistance, high sensitivity, and easy installation.

Technical Parameters
² Fork material: Stainless steel
² Supply voltage: 220V AC 50Hz (default if no requirement) / 24V DC

² Power: 2W
² Output signal: (1) 2 sets of switch outputs, contact capacity 220V AC 5A

(2) Current signal 0mA or 10mA

² Insulation strength: AC 500V 50Hz
² Amplitude: Adjustable (for measuring materials of different states and densities)
² Material particle size: ≤10mm
² Container pressure: 1.0MPa
² Medium temperature: -20℃ to 100℃

² Ambient temperature: -25℃ to 60℃

² Oscillation frequency: 200Hz
² Tuning fork amplitude: 0.5mm
² Damping delay: 2 seconds
² Tuning fork free delay: Not more than 7 seconds

² The medium should be non-viscous and should not contain substances that corrode the fork.

² Protection rating: IP67

² Explosion-proof rating: EExdIICT6Ga

² Installation method: NPT 1½ threaded or flange installation