蒙自LR-S3 Capacitive Level Switch
● Pulse-based digital capacitance measurement with admittance compensation technology
● Plug and Play
●Isolated Circuit Design
● Compensating for the effects of dielectric constant changes caused by temperature variations
● Key shortcut operations
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Product Description
Product Overview Product overview
The LRC-S Series capacitive level gauges provide continuous measurement of liquid levels in open or pressurized vessels. They compare the displacement caused by changes in liquid level with preset alarm thresholds in the instrument. When the liquid level exceeds the set limits, the gauge outputs a contact signal to activate an alarm or material-level controller, triggering either an over-limit alarm or initiating automatic control of the liquid level—either raising or lowering it as needed. These gauges are widely used across industries such as chemical processing, power generation, metallurgy, and petroleum. They are suitable for measuring a variety of media, including acids, alkalis, salt solutions, oils, liquid ammonia, and slurry-like substances. Key features include high measurement accuracy and convenient operational usability.
Measurement Principle Principle
The sensor probe of the LRC-S capacitive level switch forms a measurement system together with the container holding the medium being measured. A schematic diagram of the measurement system is shown in Figure 3-1, while its equivalent circuit principle is illustrated in Figure 3-2. In Figure 3-1, the components are labeled as follows: 1. A conductive cylindrical rod with diameter d. 2. An insulating material. 3. The measuring cylinder or container.
The inner electrode 1 and the measurement cylinder 3 form a coaxial capacitor C. 
C = k1 * h1 + k2 * h2
h1 is the material level height
H = h1 + h2
C = k₁ * h₁ + k₂ * (H - h₁) = k₂ * H + (k₁ - k₂) * h₁ (3-1)
Among them: k1*h1 represents the cylindrical capacitance formed by the gas portion.
k2*h2 represents the cylindrical capacitance formed by the material portion.
k1 and k2 are constants related to the measured medium and the container structure.
As a result, the capacitance C between 1 and 3 has a linear relationship with the liquid level h1, so detecting the change in probe capacitance C is sufficient.
Measure the height of the material level.
Figure 3-2 is the equivalent schematic diagram of the actual sensor system, where:
Cg is the equivalent capacitance for sensor material buildup.
Cx represents the incremental capacitance of the sensor caused by changes in liquid level.
R is the equivalent resistance of the sensor's material-hanging section.
When the sensor is coated with material, the portion of the sensor probe covered by the buildup effectively forms a transmission line composed of countless infinitesimally small capacitance and resistance elements. It can be mathematically proven that the real and imaginary parts of the complex impedance caused by the buildup are equal, i.e., 1/R = ω × Cg. Since the measured capacitance C equals Cx + Cg, this principle allows us to eliminate the influence of the buildup capacitance Cg on the measured capacitance during the process—specifically, by leveraging the equality of the real and imaginary components of the buildup's complex impedance. This approach helps mitigate errors introduced by electrode buildup in level measurements, thereby enhancing the instrument's ability to accurately handle complex measurement media. Meanwhile, the sensor's signal processor measures the admittance of the sensor system, from which it separately extracts the susceptance 1/R associated with the buildup resistance and the admittance ωC corresponding to the total capacitance.
C = Cx + Cg, which means
ωC = ω(Cx + Cg) (3-2)
Also, 1/R = ω × Cg (3-3)
Equation (3-2) minus equation (3-3) yields
ωCx = ωC - 1/R (3-4)
The LRC-S series capacitive level switches use the principle outlined in equation (3-4) to perform admittance measurements on the sensor system via radio frequency signals, accurately capturing the true capacitance values that reflect the material level—thereby minimizing the impact of material buildup on level measurement.
Performance Metrics TECHNICAL PARAMETERS
Tested media: liquids, solid powders
Output signals: Three sets of independent output contacts (with individually set operating points)
Contact type: Three sets of single-pole, single-throw normally open contacts (AL2 can optionally be equipped with single-pole, double-throw contacts).
Contact capacity: 5A/220VAC (resistive), 3A/220VAC (inductive)
Accuracy: ±1.0% F.S. (Typical)
Temperature drift: ±0.075%/10°C
Measuring medium temperature: -100°C to +150°C (see Figure 2.1 for the instrument's operating temperature range)
Measuring medium pressure: 0.6 MPa, 1.0 MPa, 2.5 MPa, 6.4 MPa
Relative ambient humidity: ≤85%
Power supply voltage: 24VDC / 220VAC
Static Power Consumption: 500mW
Maximum Power Consumption: 2.5W
Ambient temperature: -40°C to 70°C
Measuring the maximum particle diameter: ≤10 mm
Instrument housing material: Aluminum alloy casting
Instrument case coating: Matte green powder coating
Sensor material:
Hard Probe Tip – Stainless Steel Jacketed PTFE
Soft Probe - High-Temperature Resistant Flexible Silver-Coated Aviation Cable
Total weight: Approximately 5 kg (standard model)
External dimensions APPEARANCE OF SIZE
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Selection Assistance Selection Help
| Model | Measurement Range (m) | Medium pressure (MPa) | Medium temperature (℃) | Exploring Extreme Specifications | Exploring Extreme Features | Connection Method | Installation Method | Container Requirements | Applicable Medium |
| LRC-S51 | 0.1–3.0 | 0~6.3 | -200~250 | Φ6Φ8Φ10 | Hard Single-Probe Electrode | Flange or thread | Interpolated or External Measuring Cylinder | Metal container | Various liquids and powders |
| LRC-S52A | 0.1–3.0 | 0~2.5 | -200~250 | Φ8Φ10 | Hard Dual-Probe | Flange, for measuring hydrochloric acid level—use a PVC flange rated for temperatures ≤85°C. | Interpolated | Non-metallic containers such as cement ponds, fiberglass tanks, and PVC tanks, among others. | Acids, bases, salts, water, and other liquids |
| LRC-S52B | 0.1–30 | 0~2.5 | -200~250 | Φ5 | Soft Dual-Probe | Flange, for measuring hydrochloric acid level—use a PVC flange rated for temperatures ≤85°C. | Interpolated | Non-metallic containers such as hydrochloric acid storage tanks, cement pools, and more | Acids, bases, salts, water, and other liquids |
| LRC-S53 | 0.1–3.0 | 0~6.3 | -200~250 | Φ8 | Hard Single-Probe with Protective Tube | Flange or thread | Interpolated or External Measuring Cylinder | Metal or non-metallic container | Liquids with a relatively low dielectric constant, such as oil and liquid CO2, among others. |
| LRC-S54A | 0.1–3.0 | 0~6.3 | -200~250 | Φ8 | Hard Single Bare Probe | Flange or thread | Interpolated or External Measuring Cylinder | Metal container | Non-conductive solid particles or powder |
| LRC-S54B | 0.1–30 | 0~2.5 | -200~250 | Φ8 | Soft single bare probe | Flange or thread | Interpolated | Grain silos, cement silos, coal powder silos, and more | Non-conductive solid powders such as cement, coal powder, and others |
| LRC-S55 | 0.1–30 | 0~2.5 | -200~250 | Φ5 | Soft Single-Probe Electrode | Flange | Installed inside the container under test | Metal container | Acids, bases, salts, water, and other liquids |
| LRC-S56 | 0.1–3.0 | 0~6.3 | -200~250 | Φ6 | Soft single-probe electrode, capable of replacing dual-flange level gauges | Flange | Installed inside the container under test | Metal container | Acids, bases, salts, water, and more—such as the urine scrubber tower. |
| LRC-S320 Synthetic Ammonia High-Pressure Level Gauge | 0.1–3.0 | 0~32 | -200~250 | Φ6 | Soft single-probe electrode, specifically designed for high-pressure liquid level applications such as ammonia separation towers, cooling exchange towers, and ketone towers. | Threaded flange, lens seal | Insert-type or external measurement cylinder | Metal container | Liquid ammonia, etc. |
| The LRC-S series level gauges, except for the LRC-S54B model with a bare electrode, feature probes coated with either PTFE or PFA, enabling them to withstand corrosion from nearly all media within a temperature range of -200°C to 250°C. | |||||||||
Installation Requirements INSTALLATION
Interpolated installation method
External measurement cylinder mounting configuration
Double-flange mounting method
Bottom flange internal insertion type
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