Editorial Technical Reference

Level Sensor/Transmitter

This page explains how Level Sensor/Transmitter is classified within Chemical Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A device that measures and transmits the liquid level within the Melt Surge Tank.

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Product Specifications

Technical details and manufacturing context for Level Sensor/Transmitter

Definition
The Level Sensor/Transmitter is a critical component of the Melt Surge Tank system in chemical manufacturing. It continuously monitors the height or volume of molten material, converting the physical level into an electrical signal for process control, safety interlocks, and inventory management. The device typically operates by measuring hydrostatic pressure, capacitance, ultrasonic echo time, or radar wave reflection to determine the distance from the sensor to the liquid surface, then converts this measurement into a standardized output signal (e.g., 4-20 mA, HART, Foundation Fieldbus). Key specifications include a measuring range of 0–3000 mm (customizable per tank height), accuracy of ±0.5% FS (including linearity, hysteresis, repeatability), and a 4–20 mA output signal with HART protocol available. The supply voltage is 12–36 V DC, loop powered. Process connections are flange or threaded, DN50–DN100 per DIN 2501. The probe material is 316L stainless steel per ASTM A240, with optional PTFE coating. Operating temperature for electronics is -40–85°C, with probe up to 150°C. Operating pressure is 1.0–1.6 MPa (note:). Ingress protection is IP65–IP67 per IEC 60529. Explosion proof rating is Ex d IIC T6 per GB 3836.1 (optional for hazardous areas). Response time is ≤1 s for step change. Weight is 2.5–5.0 kg depending on insertion length. Materials on file include Stainless Steel (316L), Ceramic, and PTFE (Teflon). These specifications are reference ranges; verify model-specific values and standards with the legal manufacturer or supplier before procurement or installation.
Working Principle
The level sensor/transmitter determines the liquid level by measuring a physical property that varies with level. Common methods include hydrostatic pressure (measuring the pressure exerted by the liquid column), capacitance (changes in dielectric between electrodes), ultrasonic (time-of-flight of sound waves), or radar (reflection of microwave pulses). The sensor calculates the distance to the liquid surface and converts it into a standardized electrical signal, typically 4-20 mA, which is transmitted to a control system. The signal can be used for continuous level indication, alarms, and interlocks. The choice of measuring principle depends on the process conditions, such as temperature, pressure, and the properties of the molten material.
Common Materials
Stainless Steel (316L), Ceramic, PTFE (Teflon)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Measuring Range0–3000 mmCustomizable per tank height
Accuracy±0.5 % FSIncludes linearity, hysteresis, repeatability
Output Signal4–20 mAHART protocol available
Supply Voltage12–36 V DCLoop powered
Process ConnectionDN50–DN100Flange or threadedDIN 2501
Probe Material316LOptional PTFE coatingASTM A240
Operating Temperature-40–85 °CElectronics; probe up to 150°C
Operating Pressure1.0–1.6 MPa
Ingress ProtectionIP65–IP67For outdoor installationIEC 60529
Explosion Proof RatingEx d IIC T6Optional for hazardous areasGB 3836.1
Response Time≤1 sFor step change
Weight2.5–5.0 kgDepends on insertion length

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Sensing Element/Probe
    Directly interfaces with the process medium to detect the liquid level via pressure, capacitance, or wave reflection.
    Material: Stainless Steel, Ceramic
  • Electronics Housing
    Contains the signal conditioning circuitry, microprocessor, and communication modules that convert the raw sensor data into the output signal.
    Material: Aluminum Alloy, Stainless Steel
  • Process Connection Part
    Provides the mechanical and pressure seal for mounting the sensor to the Melt Surge Tank (e.g., flange, threaded).
    Material: Stainless Steel
  • Signal Transmitter
    Converts the measured level into the standardized 4–20 mA loop signal sent to the control system.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Melt Surge Tank
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0 to 10 bar
flow rate: Not applicable (static tank measurement)
temperature: -40°C to 150°C
slurry concentration: Up to 60% solids by weight
Media Compatibility
✓ Water-based slurries ✓ Corrosive chemicals (with appropriate wetted materials) ✓ High-viscosity fluids
Unsuitable: High-velocity turbulent flows with entrained gases
Sizing Data Required
  • Tank height and measurement range
  • Required accuracy and resolution
  • Process connection type and size

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Sensor fouling or coating
Cause: Accumulation of process media, scale, or contaminants on the sensing element, leading to inaccurate readings or complete failure.
Electronic component failure
Cause: Exposure to moisture, extreme temperatures, or voltage spikes damaging internal circuitry, resulting in signal loss or erratic output.
Maintenance Indicators
  • Erratic or unstable level readings despite stable process conditions
  • Complete loss of signal or constant output (e.g., stuck at 0% or 100%)
Engineering Tips
  • Implement regular calibration checks and cleaning schedules based on process media characteristics to prevent fouling.
  • Ensure proper environmental protection (e.g., NEMA-rated enclosures, conduit seals) and stable power supply with surge protection.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IEC 61508: Functional safety of electrical/electronic/programmable electronic safety-related systems IEC 60529: Degrees of protection provided by enclosures (IP Code) ATEX Directive 2014/34/EU: Equipment and protective systems intended for use in potentially explosive atmospheres

Quoted from the published standard.

Manufacturing Precision
  • Output signal accuracy: +/-0.5% of full scale
  • Repeatability: +/-0.1% of full scale
Quality Inspection
  • Pressure/Immersion Test for IP rating verification
  • Functional Safety Test (SIL verification per IEC 61508)

Manufacturers of Level Sensor/Transmitter

2 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Nanjing Wotian Technology Co., Ltd.
Beijing, CN
Also makes: Pressure Gauge/Sensor, Level Transmitter, Pressure Switch and 1 more
Listed on the company's own website · profile compiled by CNFX from public sources
View profile Send enquiry
Shanghai Ziasiot Technology
Shanghai, CN
Also makes: Signal Processor, Pressure Gauge/Sensor, Water Level Sensor and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
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Frequently Asked Questions

What is the measuring range of this level sensor?

The measuring range is 0–3000 mm, customizable per tank height. Confirm the exact range with the supplier based on your tank dimensions.

What output signals are available?

The standard output is 4–20 mA, with HART protocol available. This allows for analog and digital communication with control systems.

Can this sensor be used in hazardous areas?

An optional explosion proof rating of Ex d IIC T6 per GB 3836.1 is available for hazardous areas. Verify the specific certification and suitability with the manufacturer.

What are the operating temperature and pressure limits?

The electronics operate from -40 to 85°C, with the probe rated up to 150°C. Operating pressure is 1.0–1.6 MPa. Note that
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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