Tension Sensor (Load Cell/Dancer) for Web Tension Control

Product Specifications

Technical details and manufacturing context for Tension Sensor (Load Cell/Dancer)

Definition

The tension sensor is a critical component within the Separator Feeding & Tensioning Unit, responsible for real-time measurement of material tension. It ensures consistent, controlled feeding by providing feedback to the tensioning mechanism, preventing material breakage, slippage, or deformation during high-speed manufacturing processes. The sensor operates by converting mechanical force (tension) into an electrical signal. A load cell uses strain gauges that deform under load, changing electrical resistance proportionally to the force. A dancer system uses a movable roller whose position, influenced by tension changes, is measured via a potentiometer or encoder. The signal is processed by a controller to maintain preset tension levels. The sensor is available in two primary configurations: load cell and dancer. The load cell type typically employs strain gauges bonded to a metal element, while the dancer type uses a pivoting roller and position sensor. Both types are designed for integration into web handling machinery, such as printing presses, coating lines, and converting equipment. The sensor's housing and roller are typically made of stainless steel or aluminum alloy, with strain gauges made of nickel-chromium alloy. Key parameters include rated capacity (50–5000 N), accuracy class (0.05–0.5% FS per DIN EN ISO 7500-1), nonlinearity (±0.03–±0.1% FS), hysteresis (±0.02–±0.05% FS), repeatability (±0.01–±0.03% FS), excitation voltage (5–12 V DC), output sensitivity (1.0–2.0 mV/V), bridge resistance (350–1000 Ω), operating temperature range (-10 to 60 °C), temperature effect on zero and span (±0.02–±0.05% FS/10K), ingress protection (IP54–IP67 per IEC 60529), material (17-4PH stainless steel per ASTM A693), and weight (0.5–5 kg). These values are reference ranges and must be confirmed for the specific model and application. The sensor is selected based on maximum web tension and roller wrap angle. It is essential to verify model-specific values and standards with the legal manufacturer or supplier before procurement.

Working Principle

The tension sensor converts mechanical force into an electrical signal. In a load cell, strain gauges are bonded to a metal element that deforms under tension, causing a change in electrical resistance proportional to the force. In a dancer system, a movable roller is displaced by tension changes, and its position is measured via a potentiometer or encoder. The resulting signal is processed by a controller to maintain preset tension levels, ensuring stable web handling.

Common Materials

Stainless Steel (Housing/Roller), Aluminum Alloy, Strain Gauges (Nickel-Chromium)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Capacity	50–5000 N	Select based on maximum web tension and roller wrap angle.
Accuracy Class	0.05–0.5 % FS	Higher accuracy for critical tension control.DIN EN ISO 7500-1
Nonlinearity	±0.03–±0.1 % FS	Deviation from ideal straight line.
Hysteresis	±0.02–±0.05 % FS	Difference between loading and unloading curves.
Repeatability	±0.01–±0.03 % FS	Consistency under repeated loading.
Excitation Voltage	5–12 V DC	Typical bridge excitation; check compatibility.
Output Sensitivity	1.0–2.0 mV/V	Full scale output per volt of excitation.
Bridge Resistance	350–1000 Ω	Input/output resistance; affects signal conditioning.
Operating Temperature Range	-10–60 °C	Extended ranges available for harsh environments.
Temperature Effect on Zero	±0.02–±0.05 % FS/10K	Zero drift with temperature change.
Temperature Effect on Span	±0.02–±0.05 % FS/10K	Span drift with temperature change.
Ingress Protection	IP54–IP67	Higher IP for dusty or wet environments.IEC 60529
Material	17-4PH	Stainless steel for corrosion resistance.ASTM A693
Weight	0.5–5 kg	Depends on capacity and mounting 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

Strain Gauge Bridge Part
Converts mechanical strain into a proportional change in electrical resistance.

Material: Nickel-Chromium foil on polyimide substrate
Load Cell Body / Dancer Arm Part
Structural element that transmits the applied tension force to the sensing element.

Material: Stainless Steel or Aluminum Alloy
Signal Conditioning Circuit
Amplifies and processes the weak electrical signal from the sensor for reliable transmission to the controller.

Material: Electronic components on PCB
Roller Bearing Part
Allows low-friction rotation of the dancer roller, ensuring accurate tension measurement without drag.

Material: Stainless Steel with ceramic or polymer balls
Potentiometer / Encoder Optional
Reads how far the dancer roller has moved, which is what tension is inferred from on dancer builds.

Applied To / Applications

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

Separator Feeding & Tensioning Unit

View system integration details

Manufacturers of Tension Sensor (Load Cell/Dancer)

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Frequently Asked Questions

What is the difference between a load cell and a dancer tension sensor?

A load cell measures tension directly via strain gauges that deform under force, while a dancer uses a movable roller whose position changes with tension, measured by a potentiometer or encoder. Both provide feedback for tension control.

How do I select the right rated capacity for my application?

Select based on the maximum web tension and roller wrap angle. The rated capacity range is 50–5000 N, but you must calculate the actual force and choose a sensor with adequate margin. Consult the manufacturer for guidance.

What accuracy class is typical for precision tension control?

Accuracy classes range from 0.05 to 0.5% FS, with higher accuracy for critical tension control. The standard DIN EN ISO 7500-1 may be referenced for verification.

What environmental protection is available?

Ingress protection ratings range from IP54 to IP67 per IEC 60529, suitable for dusty or wet environments. Choose a higher IP rating for harsher conditions.

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pressure:	Typically atmospheric pressure environment, but housing rated for up to 10 bar for washdown applications
other spec:	Tension range: 0.1 N to 50 kN (depending on model), Accuracy: ±0.1% to ±0.5% FS, Response time: <10 ms, Overload capacity: 150% of rated capacity
temperature:	-20°C to +80°C (operating), -40°C to +100°C (storage)

Tension Sensor (Load Cell/Dancer)

Product Specifications

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