Dancer Arm or Tension Sensor for Decoiling Systems

Product Specifications

Technical details and manufacturing context for Dancer Arm or Tension Sensor

Definition

The dancer arm or tension sensor is a component used in decoiling and uncoiling systems to monitor and control the tension of materials such as metal coils, paper, plastic films, or textiles as they are unwound. It typically consists of a pivoting arm that responds to tension variations, coupled with sensors that convert mechanical movement into electrical signals for feedback control. The arm moves in response to changes in material tension: increased tension pushes the arm upward, while decreased tension allows it to drop. This movement is detected by sensors such as potentiometers, encoders, or load cells, which generate proportional electrical signals. These signals are sent to the control system, which adjusts the decoiler's speed or braking to maintain consistent tension. The sensor is available in configurations using stainless steel, aluminum alloy, or carbon steel, and can be selected based on rated load capacity, output signal, supply voltage, linearity, repeatability, operating temperature, protection class, material, weight, arm length, and overload capacity. For example, rated load capacity ranges from 50 to 500 N, output signal is typically 4–20 mA with 0–10 V optional, supply voltage is 24 V DC ±10%, linearity is ±0.5% FS, repeatability is ±0.1% FS, operating temperature is -10 to 60 °C, protection class is IP54 to IP65 per IEC 60529, and overload capacity is 150% FS without damage and 200% with mechanical stop. These values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier. The sensor is designed for use in industrial machinery and equipment manufacturing, and its selection depends on factors such as maximum web tension and roller wrap angle. It is important to confirm model-specific parameters and compliance with applicable standards before procurement.

Working Principle

The dancer arm moves in response to changes in material tension: increased tension pushes the arm upward, decreased tension allows it to drop. This mechanical movement is detected by sensors (potentiometers, encoders, or load cells) that generate proportional electrical signals. These signals are sent to the control system, which adjusts the decoiler's speed or braking to maintain consistent tension.

Common Materials

Stainless steel, Aluminum alloy, Carbon steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Load Capacity	50–500 N	Select based on maximum web tension and roller wrap angle.
Output Signal	4–20 mA	Two-wire loop powered; 0–10 V optional.
Supply Voltage	24 ±10% V DC	Reverse polarity protected.
Linearity	±0.5 % FS	Full scale; better than ±0.3% available.
Repeatability	±0.1 % FS	Under constant conditions.
Operating Temperature	-10–60 °C	Extended range -20–80 °C on request.
Protection Class	IP54–IP65	IP65 for dusty or washdown environments.IEC 60529
Material	Aluminum/Stainless Steel	Stainless steel for corrosive environments.
Weight	1.5–8 kg	Depends on load rating and arm length.
Arm Length	150–600 mm	Custom lengths available.
Overload Capacity	150 % FS	Without damage; 200% with mechanical stop.

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

Dancer Arm
Mechanical arm that moves in response to material tension changes

Material: Steel or aluminum alloy
Pivot Bearing
Allows smooth rotational movement of the dancer arm

Material: Stainless steel with polymer bushings
Tension Sensor
Converts mechanical arm movement into electrical signals

Material: Electronic components in protective housing
Mounting Bracket Part
Secures the assembly to the decoiler frame

Material: Carbon steel

Application & selection

Application Fit & Sizing Matrix

Operational Limits

pressure:	0 to 10 bar
other spec:	Material tension range: 0-5000 N, Line speed: 0-300 m/min
temperature:	-20°C to +80°C

Media Compatibility

✓ Paper webs ✓ Plastic films ✓ Metal foils

Unsuitable: Abrasive slurries or corrosive chemical environments

Sizing Data Required

Maximum material tension (N)
Material width (mm)
Required tension control accuracy (%)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause

Sensor Drift or Calibration Loss

Cause: Mechanical wear in the dancer arm pivot points or linkage, leading to inaccurate tension readings due to friction changes or misalignment over time.

Electrical Signal Failure

Cause: Environmental contamination (dust, moisture, oil) or vibration-induced damage to wiring, connectors, or internal electronics, causing intermittent or complete loss of signal output.

Maintenance Indicators

Erratic or fluctuating tension readings on the control display without corresponding changes in material feed or process conditions.
Audible squeaking, grinding, or excessive play in the dancer arm mechanism during operation.

Engineering Tips

Implement a routine calibration schedule using a reference tension gauge, and lubricate pivot points with manufacturer-recommended lubricants to minimize wear and maintain accuracy.
Install protective enclosures or seals to shield the sensor and wiring from environmental contaminants, and use vibration-dampening mounts to reduce mechanical stress on electrical components.

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 B46.1-2019 - Surface Texture DIN EN 60529 - Degrees of Protection Provided by Enclosures (IP Code)

Quoted from the published standard.

Manufacturing Precision

Bore Diameter: +/-0.01mm
Surface Flatness: 0.05mm

Quality Inspection

Dye Penetrant Test for Surface Defects
Calibration Verification Test for Sensor Accuracy

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Dancer Arm or Tension Sensor

Manufacturer profiles associated with Dancer Arm or Tension Sensor.

Sourcing Dancer Arm or Tension Sensor from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.

Frequently Asked Questions

What is the typical output signal of a dancer arm or tension sensor?

The output signal is typically 4–20 mA (two-wire loop powered), with 0–10 V optional. The exact signal type should be confirmed with the manufacturer for the specific model.

What materials are commonly used for the dancer arm?

Common materials include stainless steel, aluminum alloy, and carbon steel. The choice depends on the application environment; stainless steel is recommended for corrosive environments.

What is the overload capacity of the sensor?

The overload capacity is 150% of full scale without damage, and 200% with a mechanical stop. These values are reference ranges and must be verified for the specific model.

How should I select the rated load capacity?

Select the rated load capacity based on the maximum web tension and roller wrap angle. The available range is 50–500 N, but the exact requirement should be calculated for your application and confirmed with the supplier.

Related equipment

Applied To / Applications

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

Decoiler / Uncoiler

View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems

Downstream Applications

Specialized Tooling

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.

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 12 October 2026

Previous Product

Z-axis Ram/Spindle

Last Product

Dancer Arm or Tension Sensor