Editorial Technical Reference

Level Transmitter

This page explains how Level 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 a vessel to a control system.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Level Transmitter

Definition
The level transmitter is a component used in chemical manufacturing to continuously monitor the liquid level in vessels such as reflux drums. In a reflux drum, it ensures proper separation of vapor and liquid phases, maintaining an optimal reflux ratio and preventing liquid carryover to downstream equipment. The transmitter typically employs differential pressure, capacitance, ultrasonic, or radar measurement principles to detect the liquid level, converting the physical measurement into an electrical signal (e.g., 4–20 mA, HART) for transmission to control systems. This enables automated process control and monitoring.

Material options include stainless steel 316L, Hastelloy, and PTFE, with wetted parts available in 316L as standard, and Hastelloy C or PTFE as options. Key parameters include a measuring range of 0–10 m (customizable up to 100 m), accuracy of ±0.1% FS per IEC 60770, output signal of 4–20 mA with HART protocol available, supply voltage of 12–36 V DC with reverse polarity protection, process temperature range of -40–120 °C (higher with diaphragm seal), ambient temperature range of -40–85 °C (LCD display limited to -20–70 °C), operating pressure of 1.0–1.6 MPa, ingress protection of IP65–IP68 per IEC 60529 (IP68 for submersible versions), process connection of 1/2–2 inch with thread, flange, or sanitary options per DIN 11851, and weight of 1.5–3.5 kg depending on configuration.

These values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier. The listed standards serve as procurement references, not proof of certification or compliance. Selection requires confirming process conditions, material compatibility, and electrical interfaces. Regular maintenance includes checking for drift, ensuring signal integrity, and verifying calibration. Failure indicators include erratic readings, loss of signal, or deviation from expected values, which may signal sensor fouling, wiring issues, or electronic faults.
Working Principle
The level transmitter operates by using one of several physical measurement principles. Differential pressure transmitters measure the hydrostatic pressure exerted by the liquid column, correlating it to level. Capacitance transmitters detect changes in capacitance between a probe and the vessel wall as the level changes. Ultrasonic transmitters emit sound waves and measure the time for the echo to return from the liquid surface. Radar transmitters use microwave pulses or continuous waves to determine distance to the surface. The measured physical quantity is converted into an electrical signal, typically 4–20 mA or HART, which is transmitted to a control system for monitoring and process control. The choice of principle depends on process conditions such as temperature, pressure, vapor presence, and the nature of the liquid.
Common Materials
Stainless Steel 316L, Hastelloy, PTFE
Technical Parameters
ParameterTypical rangeNotes & selection driver
Measuring Range0–10 mCustomizable up to 100 m
Accuracy±0.1 % FSIncludes linearity, hysteresis, repeatabilityIEC 60770
Output Signal4–20 mA HARTHART protocol available
Supply Voltage12–36 V DCReverse polarity protected
Process Temperature-40–120 °CHigher with diaphragm seal
Ambient Temperature-40–85 °CLCD display limited to -20–70
Ingress ProtectionIP65–IP68IP68 for submersible versionsIEC 60529
Wetted Parts Material316LHastelloy C or PTFE optionalASTM A240
Process Connection1/2–2 inchThread, flange, or sanitaryDIN 11851
Weight1.5–3.5 kgDepends on configuration

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
  • Sensor Element Part
    Detects physical level changes through pressure, capacitance, or wave reflection
    Material: Stainless Steel
  • Electronics Housing
    Contains signal processing circuitry and protects from environmental conditions
    Material: Aluminum or Stainless Steel
  • Process Connection Part
    Provides mechanical interface to the reflux drum (flange, threaded, etc.)
    Material: Stainless Steel
  • Diaphragm/Seal Part
    Isolates sensing element from process fluid while transmitting pressure
    Material: Hastelloy or PTFE

Applied To / Applications

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

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0 to 100 bar
other spec: Slurry concentration up to 60% solids by weight
temperature: -40°C to 150°C
Media Compatibility
✓ Water and aqueous solutions ✓ Hydrocarbons (oil, diesel, gasoline) ✓ Corrosive chemicals (acids, bases) with compatible wetted materials
Unsuitable: High-viscosity non-Newtonian fluids (e.g., heavy sludge, tar)
Sizing Data Required
  • Vessel height and required measurement range
  • Process fluid density and specific gravity
  • Required accuracy and output signal type (4-20mA, HART, etc.)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Sensor fouling/coating
Cause: Accumulation of process media (e.g., sludge, scaling, wax) on the sensing element, leading to inaccurate level readings or complete failure.
Electronics failure
Cause: Environmental factors such as moisture ingress, extreme temperatures, or electrical surges damaging internal circuitry or components.
Maintenance Indicators
  • Erratic or frozen level readings on the control system display
  • Audible alarm from the transmitter or control system indicating signal loss or out-of-range condition
Engineering Tips
  • Implement regular calibration and verification schedules using certified test equipment to ensure measurement accuracy and detect drift early.
  • Install protective measures such as weatherproof enclosures, surge protectors, and proper sealing to shield the transmitter from harsh environmental conditions.

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 ATEX Directive 2014/34/EU: Equipment and protective systems intended for use in potentially explosive atmospheres

Quoted from the published standard.

Manufacturing Precision
  • Output accuracy: +/-0.1% of span
  • Repeatability: +/-0.05% of span
Quality Inspection
  • Hydrostatic pressure test: 1.5 times maximum working pressure for 30 minutes
  • Electromagnetic compatibility (EMC) test: IEC 61326-1 for industrial environments

Manufacturers of Level Transmitter

12 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.

BCST Group
Shanghai, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Yantai Wepower Electronic Co., Ltd.
Shandong, CN
Founded 2003
CE ROSH Reach Explosion-proof +3
Listed on the company's own website · profile compiled by CNFX from public sources
ARTang Instrument Co., Ltd.
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
HollySys
Beijing, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Hunan Rika Electronic Tech Co., Ltd.
Hunan, CN
Listed on the company's own website · profile compiled by CNFX from public sources
LEFOO Industrial Co., Ltd.
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Nanjing Wotian Technology Co., Ltd.
Jiangsu, CN
Listed on the company's own website · profile compiled by CNFX from public sources
ORR Sensor Co., Ltd.
Shanghai, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Shaanxi ShengKe Electronic Technology Co., Ltd.
Shaanxi, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Shandong Friend Control System Co., Ltd.
Shandong, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Shanghai Automation Instrumentation Co., Ltd
Shanghai, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Shanghai LEEG Instruments
Shanghai, CN
Listed on the company's own website · profile compiled by CNFX from public sources
View All Factories

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

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Frequently Asked Questions

What measurement principles are available for this level transmitter?

The level transmitter can use differential pressure, capacitance, ultrasonic, or radar measurement. The specific principle depends on the model and application requirements. Differential pressure is common for many liquids, while radar is suitable for challenging conditions like vapors or foam. Consult the manufacturer for the best option for your process.

What is the accuracy of this level transmitter?

The accuracy is ±0.1% of full scale (FS) according to IEC 60770, which includes linearity, hysteresis, and repeatability. This is a reference value; actual performance may vary with installation and process conditions. Always verify the accuracy for the specific model and application with the supplier.

Can the measuring range be customized?

Yes, the standard measuring range is 0–10 meters, but it is customizable up to 100 meters. The actual range depends on the model and configuration. Confirm the required range with the manufacturer to ensure the transmitter meets your process needs.

What are the available process connections?

Process connections are available in sizes from 1/2 to 2 inches, with options for thread, flange, or sanitary connections per DIN 11851. The choice depends on the vessel and piping requirements. Verify compatibility with your system before ordering.

Data Basis

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

Preliminary Technical Classification
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