RF admittance level switch

High intelligence level limit switch

◆ Adopting the principle of RF capacitor;

◆ Long universality, anti adhesion, detachable probe, high bottom temperature resistance;

◆ Multiple probe forms, customizable design.

The SP type electronic circuit adopts an anti adhesion circuit, which can detect the true level while removing the influence of false level signals adhered and suspended around the probe.

SP type can detect the presence (high position) or absence (low position) of materials in various containers based on the working principle of ash silo sensing. It can set fault alarms in high or low mode.

SP type can detect any process material, such as refined oil, gasoline, conductive mud, etc.

SP type is matched with L86X type sensing probe. L863C is a universal probe, L890C is a flat probe, and also offers steel rope probes with Teflon and stainless steel structures. It can be used in high temperature and high pressure environments, liquids, powders, large solid blocks, and corrosive objects.

Measurement principle:

The working principle of RF admittance level switch is based on RF capacitor technology. Apply a radio frequency to the probe and determine the impact caused by the surrounding environment through continuous analysis. Due to the fact that all materials have a dielectric constant and their conductivity is different from that of air, the total impedance reflected by the slight capacitance shift when the probe comes into contact with the material changes. Because the energized probe and container wall form the two plates of the capacitor, the insulator of the probe and the surrounding air become dielectric materials. When air (with a dielectric constant of 1.0) is replaced by any other material (with a dielectric constant>1), the capacitance effect is enhanced. Thus changing the impedance of the application scenario. The change in capacitance value causes a change in impedance. After this influence is measured by the circuit, it is compared with the reference benchmark established by the sensitivity setting (circuit).

The correct setting of the sensitivity of the RF admittance level switch will affect the correct variation of the sensor output. The Null-KoTeTM circuit of the probe can make the measurement circuit ignore the accumulated material on the probe, otherwise it will cause sensitivity failure. The Null-KoTeTM circuit is excited with the same radio frequency potential as applied to the sensing probe. Due to the inability of current to flow at the same potential, the Null-KoTeTM circuit blocks the flow of current from the energized probe through the accumulated material to the container wall. This measures the material around the energized probe, not the accumulated material.

Design features:

Strong universality: can be applied to the measurement of various conductive and non-conductive media, such as liquids, viscous substances, particles, powders, and fly ash;

Anti adhesion: Using a patented anti adhesion circuit, it can eliminate false signals caused by material adhesion;

Detachable probe: There is no cable connection between the controller and the probe, and the controller can be removed, replaced, and repaired at any time without affecting the entry and exit of materials;

High and low temperature resistance: suitable for working environments ranging from -184 ℃ to 280 ℃, and ceramic probes suitable for higher temperatures can also be provided;

Output form: It adopts a double pole double throw relay signal output, with a status light displaying the output status and a delay function from 0 to 30 seconds.

Application areas:

Flour mill: detect the level of flour and wheat grains;

Feed mill: detect soybean meal level;

Power plant: detecting the level of fly ash material;

Glass factory: detect quartz sand and broken glass material levels;

Construction machinery: detecting the level of cement silo materials;

Casting machinery: detecting the level of sand particles;

Hydraulic machinery: detect the level of lubricating oil;

Chemical plant: detect the liquid level of chemical materials such as polyester, spandex, acid, alkali, etc;

Environmental protection: detecting sewage liquid level;

Boiler factory: detect the water level of the steam drum and other pressure vessels

Level control in other industries

Product Model: KYT-SP

Typical applications: Fault alarm, upper limit, offline, adjustable on site

Shell standard: cast aluminum, standard

Probe material: 304/316 stainless steel, PTFE (optional)

Operating temperature: -184~+260 ℃ (ceramic probe is selected for temperatures ≥ 260 ℃)

Environmental temperature: -40~+66 ℃

Process pressure: 0~2Mpa (customizable for ≥ 2 Mpa)

Relay output: double pole double throw, 10A, 115vAC or 26vDC (resistive)

Or 5A, 220V AC

Power supply: 120/220V AC, 50-60Hz; 24vDC (optional)

Process connection: flange, thread (optional)

Probe length: 500mm (optional, can be customized according to requirements)

Power consumption: 3w

Delay time: adjustable from 0 to 30 seconds (on or off)

Sensitivity: 0.5pf~750pf

Electrical interface: M20 * 1.5

Power loss protection: normally open or normally closed, switchable on site

Protection level: Level I, Group C or D; Level II, Group E, F or G