Capacitive Level Sensor
The Capacitive Level Sensor is a high-precision industrial instrument designed for continuous liquid level measurement in a wide range of applications, including chemical, petroleum, food, and pharmaceutical industries. Utilizing the principle of capacitance, the sensor detects changes in liquid level accurately, providing reliable real-time monitoring for both simple and complex liquid media.
This sensor is ideal for measuring water, oil, acids, alkalis, and other conductive or non-conductive liquids. Its robust design ensures long-term stability and corrosion resistance, making it suitable for harsh industrial environments. With flexible installation options—top-mount or side-mount—and customizable measurement range and output signals, it adapts easily to specific industrial requirements.
Key Benefits:
-
High Accuracy: Ensures precise liquid level readings with minimal error.
-
Versatile Compatibility: Works with a wide variety of liquids and interfaces.
-
Durable & Corrosion-Resistant: Long-lasting performance in harsh conditions.
-
Easy Installation: Flexible mounting options reduce installation time and costs.
-
Customizable: Range, output, and configuration can be tailored for each application.
The capacitive level sensor provides a cost-effective, low-maintenance solution for real-time level monitoring, improving operational efficiency and process safety across industries.
Level Measuring Instruments Description
Capacitive Level Sensor – Key Features
-
Continuous Level Measurement – Accurately monitors the level of almost all corrosive and non-corrosive liquids.
-
Wide Operating Temperature – Performs reliably in extreme conditions from -190°C to +200°C.
-
High Pressure Tolerance – Supports operating pressures from -0.1 MPa to 32 MPa.
-
Minimal Environmental Impact – Measurement remains stable despite variations in pressure, temperature, or humidity.
-
High Stability & Anti-Interference – Ensures reliable and precise readings even in electrically noisy environments.
-
Explosion-Proof Design – Certified for safe operation in hazardous environments.
-
Customizable Solutions – Range, electrode type, output signal, and process connections can be tailored to specific applications.
Applications of Capacitive Liquid Level Sensor
The capacitive liquid level sensor is widely used in industrial and process control applications where accurate, continuous liquid level measurement is required. Its robust design and high precision make it suitable for a variety of challenging environments.
Typical Applications:
-
Chemical Industry – Monitoring and controlling the level of corrosive acids, alkalis, and other chemical solutions in storage tanks and reactors.
-
Petroleum & Oil Storage – Level measurement in oil tanks, fuel depots, and petrochemical processing units.
-
Food & Beverage Industry – Accurate monitoring of liquids such as water, juice, milk, and other food-grade fluids.
-
Pharmaceutical Industry – Ensures precise liquid level control in pharmaceutical production and storage tanks.
-
Water & Wastewater Treatment – Monitoring water levels in reservoirs, treatment tanks, and pipelines.
-
Energy & Power Plants – Tank level measurement for fuel, cooling water, or other industrial fluids.
-
Non-Metallic or Specialty Tanks – Works effectively in plastic, fiberglass, or other non-metallic containers with dual electrode configurations.
Advantages in Applications:
-
Provides continuous and high-precision level monitoring.
-
Operates reliably under extreme temperatures and pressures.
-
Corrosion-resistant and suitable for harsh chemical environments.
-
Compatible with automation and process control systems for real-time monitoring.
Level Measuring Instruments Parameter
| Parameter | Specification |
|---|---|
| Electrode Type | Single electrode (metallic tanks); Double electrode (non-metallic tanks) |
| Electrode Material / Style | 1. Steel, rigid2. Steel, flexible3. PTFE-coated, rigid4. PTFE-coated, flexible |
| Measuring Range | Rigid electrode: 0~3m (customizable)Flexible electrode: 0~60m (customizable) |
| Accuracy Class | 0.5, 1.0, 1.5, 2.0 |
| Transmission Distance | >1000m |
| Signal Output | 2-wire 4–20 mA DC |
| Load Resistance | 0–600 Ω |
| Pressure Rating | 6, 10, 25, 64, up to 320 bar |
| Operating Temperature | -190 ~ 200 °C |
| Ambient Temperature | -50 ~ +80 °C |
| Relative Humidity | ≤85% |
| Maximum Particle Size | ≤2 mm |
| Process Connection | 1. Flange: DN20–DN1502. Thread: M27×23. Customizable options |
| Electrical Connection | M20×1.5 female thread |
| Explosion Proof | Ex d IIC T6 Gb |
Instrava OEM/ODM
Tailored Sourcing & Customization: Getting You the Exact Product You Need
As your trusted supplier and sourcing partner, we bridge the gap between your custom requirements and China’s vast manufacturing capabilities.
Finding the right product in a massive supply chain can be challenging. That is where we step in.
As a curated industrial supplier, our core value is simple: we stand in your shoes to help you procure the most optimal products. Whether you are an EPC contractor needing specialized technical compliance, an OEM equipment manufacturer looking for custom branding, or an industrial distributor/trader seeking competitive edge, we customize and tailor products to fit your exact procurement needs.
How We Customize to Fit Your Procurement Needs
For EPC Contractors & Engineers: We custom-configure instruments and devices to match your precise datasheets—tailoring process connections, exotic materials, signal protocols, and managing third-party calibration and testing so you get project-ready solutions.
For OEM Equipment Manufacturers: We provide comprehensive OEM/ODM customization, including custom housing, labeling, branding (private labeling), and tailored technical specifications to seamlessly integrate with your machinery.
For Industrial Distributors & Traders: We offer flexible customization in packaging, product ranges, and technical parameters, helping you differentiate your portfolio and win more local bids.
Why Partner with Us for Custom Sourcing?
One-Stop Engineering Alignment: You don’t have to deal with multiple factories. We translate your technical requirements into precise manufacturer blueprints.
Strict Quality & Compliance Safeguard: We oversee the entire customization and production process in China, ensuring the final customized product meets your local standards and certifications.
Our Ultimate Value: We don’t just sell what’s on the shelf. We find, customize, and deliver the most suitable and cost-effective product for your unique application.
How does a capacitive liquid level sensor measure liquid level, and how accurate is it?
A capacitive level sensor forms a capacitor between its probe and an opposing electrode, with the liquid acting as the dielectric. Changes in liquid height alter the capacitance, which is converted into an electrical signal (typically 4–20 mA or voltage output).
Accuracy depends on:
| Sensor Type | Measuring Range | Typical Accuracy | Notes |
|---|---|---|---|
| Rigid Electrode | 0–3 m | ±1% FS | Short-range, high-stability |
| Flexible Electrode | 0–60 m | ±1.5% FS | Suitable for deep tanks or irregular shapes |
Capacitive sensors can detect level changes as small as 1–2 mm in optimal conditions. Accuracy is influenced minimally by pressure, temperature, and humidity due to the dielectric-based principle.
Can capacitive sensors be used with corrosive or multi-phase liquids?
Yes. Sensors can be equipped with PTFE or other corrosion-resistant coatings. They are compatible with strong acids, alkalis, and aggressive chemical media.
Considerations for multi-phase liquids:
-
For stratified liquids (e.g., oil-water), the sensor may detect interface layers if configured with multiple electrodes.
-
Dielectric constants of the media affect capacitance; calibration may be needed for accurate measurements.
Example:
| Medium | Dielectric Constant (εr) | Recommendation |
|---|---|---|
| Water | 80 | Standard calibration |
| Oil | 2–4 | Use flexible PTFE-coated probe |
| Acid (HCl) | 25 | PTFE or corrosion-resistant electrodes |
Which tank types are compatible with capacitive level sensors?
-
Metal Tanks: Single-electrode probe works, tank wall acts as opposing electrode.
-
Non-metallic Tanks (Plastic, Fiberglass): Dual-electrode setup needed.
-
Complex Shapes / Large Tanks: Flexible electrodes or multiple probes improve measurement coverage.
Insight: Using multiple probes in large tanks allows redundancy and reduces the effect of liquid turbulence or sloshing on accuracy.
How do environmental factors affect performance?
Capacitive sensors are largely immune to environmental influences:
| Factor | Effect on Measurement | Mitigation / Notes |
|---|---|---|
| Pressure | Negligible, up to 32 MPa | Ensure electrode and sealing materials rated for tank pressure |
| Temperature | Minimal within -190 ~ 200°C | Use PTFE or high-temperature materials for extreme conditions |
| Humidity | None | Electronics are sealed in IP65/IP67 housing |
| Viscosity / Particles | Minor signal damping | Use flexible probes for slurries or max particle size ≤2 mm |
Insight: Compared to ultrasonic or radar level sensors, capacitive sensors are less affected by foam, vapor, or condensate layers.
What customization options are available for OEM/ODM projects?
We offer extensive customization to match specific industrial needs:
| Customizable Feature | Options / Range |
|---|---|
| Electrode Type | Rigid / Flexible, Steel / PTFE-coated |
| Measuring Range | 0–3 m (rigid), 0–60 m (flexible) |
| Signal Output | 4–20 mA, 0–10 V, RS485 |
| Process Connection | Flange DN20–DN150, M27×2, custom designs |
| Explosion Protection | Ex d IIC T6 Gb, custom certifications |
| Operating Environment | Temperature, pressure, chemical resistance tailored |
Insight: Proper customization ensures long-term reliability, reduces maintenance, and optimizes ROI by matching the sensor to the specific liquid and tank conditions.
Can capacitive sensors integrate with industrial control systems?
Yes. The output signal (typically 4–20 mA or RS485) allows seamless integration with PLCs, SCADA, DCS, or other monitoring systems.
Example Integration:
| Signal Type | Compatible System | Notes |
|---|---|---|
| 4–20 mA | PLC, DCS | Most common; easy wiring, analog signal |
| RS485 Modbus | SCADA, Industrial PCs | Supports remote monitoring, multi-sensor networks |
| Voltage (0–10 V) | Data loggers, Display Panels | Short-range applications, low-power systems |
Insight: Capacitive sensors can provide real-time alerts, automated level control, and remote diagnostics. Compared to float or ultrasonic sensors, they offer higher reliability in extreme environments and corrosive media.
Why Trust Instrava?
We select manufacturers from a neutral, impartial standpoint, always with your best interests in mind.
Our very existence depends on helping you source the products that are the perfect fit for your needs.
Based in China, we are able to conduct on-site inspections of production environments and product quality firsthand.
We help you avoid intermediaries posing as factories.
We facilitate smoother after-sales support, eliminating time zone issues and the delays often associated with dealing directly with factories.
Our multilingual team ensures effective communication.
For a trading startup, every interaction with a client is a precious opportunity—a sign that you are willing to place your trust in us and give us the chance to prove ourselves.
In the digital age, while information is easily accessible, misconceptions often cloud the trust between people.
Instrava relies entirely on trust; it is our core philosophy and the foundation of our existence in society. It is the fundamental basis for our long-term growth and our commitment to serving the community.
Please place your trust in us.
