Editorial Technical Reference

Level Gauge

This page explains how Level Gauge 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 level gauge is a component used in chemical manufacturing to measure and indicate the liquid level inside a vessel, such as a reflux drum.

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Product Specifications

Technical details and manufacturing context for Level Gauge

Definition
A level gauge is a component used in chemical manufacturing to measure and indicate the liquid level inside a vessel, such as a reflux drum. It provides visual or electronic indication of the liquid level, ensuring proper operation and preventing overfilling or dry running conditions. The gauge operates through direct visual observation (sight glass), magnetic coupling, float mechanisms, or electronic sensors to detect the interface between liquid and vapor phases, transmitting this information to control systems or operators. Typical materials include stainless steel, tempered glass, and PTFE. Key parameters include measuring range (300–3000 mm, custom lengths available), accuracy (±5 mm for magnetic flap type), operating temperature (-40–350°C, high temp version up to 450°C), operating pressure (1.0–1.6 MPa), process connection (DN25–DN100, flange or threaded, per DIN 2501), material (304/316L, optional PTFE lining, per ASTM A240), protection class (IP65–IP68, per IEC 60529), output signal (4–20 mA, HART protocol optional, per IEC 60381-1), supply voltage (24 V DC ±10%, two-wire loop powered), and weight (5–15 kg, depends on length and material). These values are directory reference ranges and must be confirmed for the actual model and application with the legal manufacturer or supplier. The level gauge is a critical component for safe and efficient operation of chemical processes, and proper selection and verification are essential.
Working Principle
Level gauges operate through direct visual observation (sight glass), magnetic coupling, float mechanisms, or electronic sensors. These methods detect the interface between liquid and vapor phases, transmitting the information to control systems or operators. The choice of principle depends on the application, including process conditions and required accuracy.
Common Materials
Stainless Steel, Tempered Glass, PTFE
Technical Parameters
ParameterTypical rangeNotes & selection driver
Measuring Range300–3000 mmCustom lengths available
Accuracy±5 mmFor magnetic flap type
Operating Temperature-40–350 °CHigh temp version up to 450°C
Process ConnectionDN25–DN100Flange or threadedDIN 2501
Material304/316LOptional PTFE liningASTM A240
Protection ClassIP65–IP68For outdoor installationIEC 60529
Output Signal4–20 mAHART protocol optionalIEC 60381-1
Supply Voltage24 ±10% V DCTwo-wire loop powered
Weight5–15 kgDepends on length and material

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
  • Sight Glass Part
    Provides visual observation of liquid level
    Material: Tempered Glass
  • Float Assembly
    Mechanically detects liquid level position
    Material: Stainless Steel
  • Magnetic Coupling
    Transfers level indication without direct contact
    Material: Magnetic Alloy

Applied To / Applications

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

Reflux Drum
View system integration details

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 +350°C
Media Compatibility
✓ Water-based liquids ✓ Hydrocarbon fuels ✓ Chemical process fluids
Unsuitable: Highly corrosive acids (e.g., concentrated sulfuric acid)
Sizing Data Required
  • Vessel height/depth
  • Required measurement accuracy
  • Process connection size

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Fouling/Coating Buildup
Cause: Accumulation of process media deposits (scale, sludge, or viscous materials) on sensing elements or internal surfaces, leading to inaccurate level readings or complete blockage.
Sensor/Electronics Failure
Cause: Degradation of electronic components due to environmental factors (moisture ingress, extreme temperatures, corrosive atmospheres) or electrical issues (power surges, improper grounding), resulting in signal loss, drift, or erratic output.
Maintenance Indicators
  • Persistent or erratic level readings that do not correspond to known process conditions or manual verification.
  • Visible physical damage (cracks, severe corrosion, leaks) or audible alarms/error codes from the gauge or associated control system indicating a fault.
Engineering Tips
  • Implement a regular cleaning and calibration schedule based on process conditions (e.g., frequency for fouling-prone applications) to maintain accuracy and prevent buildup.
  • Ensure proper environmental protection (e.g., NEMA/IP ratings, purging, or heating for moisture) and electrical protection (surge suppressors, proper wiring) to safeguard sensitive components from harsh 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
ANSI/ASME B40.100 - Pressure gauges and gauge attachments DIN 16086 - Pressure gauges with electrical contacts

Quoted from the published standard.

Manufacturing Precision
  • Accuracy: +/-1% of full scale
  • Flatness: 0.05mm per 100mm length
Quality Inspection
  • Hydrostatic pressure test to 150% of rated pressure
  • Leak test with helium mass spectrometry

Manufacturers of Level Gauge

5 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
Also makes: Butterfly Valve, Signal Processor, Temperature Controller and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
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Donjoy Technology
Wenzhou, Zhejiang, CN
Also makes: Sanitary Fittings, Butterfly Valve, Poppet/Valve and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
View profile Send enquiry
Shaanxi ShengKe Electronic Technology Co., Ltd.
Jilin, CN
Also makes: Liquid Level Sensor, Water Level Sensor, Level Transmitter and 6 more
Listed on the company's own website · profile compiled by CNFX from public sources
View profile Send enquiry
Shandong Fengtu IOT Technology Co., Ltd
Shandong, CN
Also makes: Environmental Monitoring System, Thickness Sensor, Power Analyzer and 5 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 gauge?

The measuring range is 300–3000 mm, with custom lengths available. Confirm the exact range for your application with the manufacturer.

What materials are available?

Materials include stainless steel (304/316L) with optional PTFE lining, tempered glass, and PTFE. Verify material compatibility with your process.

What is the operating temperature range?

The standard operating temperature is -40–350°C, with a high-temperature version up to 450°C. Confirm the temperature rating for your specific model.

What output signal options are available?

The output signal is 4–20 mA, with HART protocol optional. The supply voltage is 24 V DC ±10%, two-wire loop powered. Verify compatibility with your control system.
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
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.
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