Level Sensor Assembly for DEF Tanks | Specifications & Verification

Product Specifications

Technical details and manufacturing context for Level Sensor Assembly

Definition

The Level Sensor Assembly is a critical component of the 'DEF Tank with Level Sensor' system, responsible for accurately monitoring the Diesel Exhaust Fluid (DEF) level. It integrates sensing technology with mechanical mounting and electrical interfaces to provide real-time level data to vehicle control systems, ensuring proper SCR system operation and preventing DEF depletion. The assembly is designed for use in machinery and equipment manufacturing, particularly in vehicles equipped with selective catalytic reduction (SCR) systems. It is available in various configurations to suit different tank depths and mounting requirements. The assembly typically includes a sensing element, a protective housing, and an electrical connector. The sensing element may employ capacitive, ultrasonic, or float-based methods to detect liquid level. The housing is constructed from stainless steel and engineering plastics, providing durability and compatibility with DEF. The electrical connection is typically a 4-pin M12x1 connector, conforming to IEC 61076-2-101. The assembly operates over a supply voltage range of 9–36 V DC, with a 4–20 mA output signal. It is designed for continuous operation in temperatures from -40 to 85 °C, and can be stored in temperatures from -40 to 105 °C. The ingress protection rating ranges from IP67 to IP69K, suitable for high-pressure washdown. The wetted parts are made of 316L stainless steel, with optional Hastelloy. Process connections are available in thread sizes from G1/2 to G1, conforming to ISO 228-1. The measuring range is customizable from 100 to 1000 mm, with an accuracy of ±0.5% FS. The operating pressure range is 1.0–1.6 MPa. The weight varies from 0.3 to 1.2 kg, depending on length and connection. For specific applications, it is essential to verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The Level Sensor Assembly operates using capacitive, ultrasonic, or float-based sensing methods. In capacitive sensing, changes in the dielectric constant between electrodes as the liquid level changes alter capacitance. Ultrasonic sensors emit high-frequency sound waves and measure the time for the echo to return, indicating the distance to the liquid surface. Float-based sensors use a buoyant element that moves with the liquid level, actuating a switch or a potentiometer. The assembly detects changes in liquid level through physical displacement or electrical property variations, converts these signals to electrical outputs, and transmits them via connectors to monitoring systems. The output is typically a 4–20 mA analog signal, proportional to the level. The assembly is powered by a 9–36 V DC supply, with reverse polarity protection. The signal can be used by vehicle control systems to trigger warnings or control the DEF dosing process.

Common Materials

Stainless Steel, Engineering Plastics, Electronic Components

Technical Parameters

Parameter	Typical range	Notes & selection driver
Measuring Range	100–1000 mm	Customizable per tank depth
Accuracy	±0.5 % FS	Full scale accuracy
Output Signal	4–20 mA	Two-wire loop powered
Supply Voltage	9–36 V DC	Reverse polarity protected
Operating Temperature	-40–85 °C	Continuous operation
Storage Temperature	-40–105 °C	Non-operating
Ingress Protection	IP67–IP69K	IP69K for high-pressure washdownIEC 60529
Material (Wetted Parts)	316L	Stainless steel; optional HastelloyASTM A276
Process Connection	G1/2–G1	Thread size optionsISO 228-1
Electrical Connection	M12x1	4-pin connectorIEC 61076-2-101
Weight	0.3–1.2 kg	Depends on length and connection

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 Probe
Primary sensing element that detects liquid level through physical or electrical interaction

Material: Stainless Steel
Mounting Flange Part
Provides secure attachment to the DEF tank with proper sealing

Material: Stainless Steel
Electrical Connector Part
Interface for power supply and signal transmission to vehicle systems

Material: Engineering Plastic with Metal Contacts
Signal Processing Circuit
Converts raw sensor signals to standardized output signals

Material: Electronic Components on PCB
Float Optional
Rides the liquid surface and drives the switch or wiper on float-type builds.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Level Sensor Assembly.

Applied To / Applications

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

DEF Tank with Level Sensor

View system integration details

Manufacturers of Level Sensor Assembly

Manufacturer profiles associated with Level Sensor Assembly.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What sensing technologies are available for this level sensor assembly?

The assembly can use capacitive, ultrasonic, or float-based sensing methods. The specific technology depends on the application requirements and must be confirmed with the manufacturer.

What is the measuring range and accuracy?

The measuring range is customizable from 100 to 1000 mm, with an accuracy of ±0.5% FS. These values are reference ranges and should be verified for the specific model.

What are the electrical specifications?

The assembly operates on a 9–36 V DC supply, with reverse polarity protection. The output signal is a 4–20 mA two-wire loop. The electrical connection is a 4-pin M12x1 connector per IEC 61076-2-101.

What environmental conditions can it withstand?

It is rated for continuous operation from -40 to 85 °C and storage from -40 to 105 °C. The ingress protection is IP67 to IP69K, suitable for high-pressure washdown. The operating pressure range is 1.0–1.6 MPa.

Data Basis

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

Preliminary Technical Classification

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pressure:	0 to 3 bar (gauge)
other spec:	Max slurry concentration: 5% solids by weight, Flow rate: Not applicable (static measurement)
temperature:	-40°C to +85°C

Level Sensor Assembly

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards