The Erhardt+Leimer Model PD 2525 Web Tension Load Cell (Factory Material Number: 00210925, Nominal Measuring Force: 0.15 kN), engineered and manufactured by Erhardt+Leimer GmbH in Augsburg, Germany, is a precision flange-mounted strain gauge transducer designed for continuous web tension measurement across web converting and printing machinery.

Operating Principle of the PD 25 Series:
The load cell is installed directly between the measuring roller's bearing housing and the machine side frame. As the running web passes over the measuring roller across a designated wrap angle, the resultant tension force exerts a radial vector through the roller shaft onto the PD 2525 transducer:
- Inside the load cell body, a full Wheatstone strain gauge bridge is bonded onto dual symmetrical flexure beams.
- Microscopic elastic deflection under tension changes bridge resistance, generating a precise, linearized millivolt (mV) signal proportional to applied web tension.
- This analog signal feeds directly into dedicated Erhardt+Leimer tension amplifiers (such as the CV 22 or DC series) to generate standardized 0-10 V / 4-20 mA outputs or communicate via CAN/Ethernet bus protocols to modulate unwind/rewind drives and magnetic particle brakes.

Model Designation & Configuration Breakdown (PD 2525 / 00210925):
- PD 25: Erhardt+Leimer compact flange-mounted load cell series designed for live shaft or dead shaft idler roller configurations.
- 25: Geometric housing footprint and standard bearing bore mounting profile.
- 0.15 kN: Factory-calibrated nominal measuring force of 150 N (~15 kgf) – ideal for light-tension web substrates requiring delicate handling.
- 00210925: Standardized worldwide factory part identification ensuring 100% mechanical and electrical interchangeability.

Key Engineering Features & Operational Advantages:
- High Measurement Sensitivity & Linearity: Utilizes premium foil strain gauges delivering low hysteresis (< 0.1% FSO) and high repeat accuracy (< 0.05% FSO), allowing dynamic detection of microscopic tension fluctuations during machine acceleration and deceleration.
- Integrated Multi-Directional Overload Protection: Features built-in internal mechanical stops that withstand overloads up to 1000% of nominal rating (up to 1.5 kN) in the measurement vector, alongside axial protection. This safeguards the flexure elements against severe web snapback shocks or accidental mechanical impact.
- Temperature Compensation & Long-Term Stability: Symmetrical bridge configuration cancels out thermal zero drift caused by ambient temperature swings and bearing frictional heat, ensuring stable calibration over long production shifts.
- Robust Sealed Metallurgy: Machined from high-strength, corrosion-protected metal alloy, encapsulated with protective potting to IP65 ingress protection standards. Built to operate continuously against industrial dust, ambient moisture, and mechanical machine vibrations.

Target Industrial Sectors & Applications:
- Flexible Packaging & Film Converting: Precision tension control for ultra-thin BOPP, CPP, and PET films, metalized webs, and aluminum foil on rotogravure printing, solventless laminating, and slitter rewinder lines.
- Lithium-Ion Battery Manufacturing: Delicate tension stabilization on cathode/anode coated foil webs and micro-porous separator films to prevent coating micro-cracks and web stretching.
- Label Converting & Narrow Web Printing: Tension tracking for silicone release liners, face stocks, and thermal papers through flexo presses and rotary die-cutters.
- Technical Textiles & Non-Wovens: Continuous tension regulation on spunbond fabrics, medical non-wovens, and technical yarn webs through calendering and winder stations.

• Manufacturer: Erhardt+Leimer (Erhardt+Leimer GmbH)
• Country of Origin: 100% Germany (Made in Germany)
• Product Line: PD Series Flange-Mounted Web Tension Load Cells
• Model / Series Designation: PD 2525
• Factory Material Number: 00210925
• Nominal Measuring Force: 0.15 kN (150 N / ~15 kgf)
• Measurement Principle: Full Wheatstone strain gauge bridge
• Nominal Sensitivity: Approximately 1.0 to 1.5 mV/V (amplifier-matched)
• Bridge Supply Voltage (Excitation): 5 to 10 VDC
• Bridge Resistance: ~350 Ω or ~700 Ω nominal
• Combined Error: < ±0.5% of Full Scale Output (FSO)
• Mechanical Hysteresis: < ±0.1% FSO
• Repeatability: < ±0.05% FSO
• Safe Mechanical Overload Limit: 150% to 200% of nominal force
• Ultimate Mechanical Overload Protection: Up to 1000% (10x nominal rating) via integrated mechanical stops
• Measuring Vector: Radial force perpendicular or vectored to mounting flange plane
• Temperature Coefficient of Zero (TK Zero): ≤ ±0.2% FSO / 10K
• Temperature Coefficient of Span (TK Span): ≤ ±0.2% FSO / 10K
• Housing Metallurgy: High-strength corrosion-resistant metal alloy
• Mounting Profile: Flange-mounted pillow block style for idler roller integration
• Electrical Termination: Heavy-duty round industrial connector with lock or integral shielded cable
• Ingress Protection Rating: IP65 conforming to EN 60529 (dust-tight and splash resistant)
• Operating Ambient Temperature Range: -10°C to +60°C (+14°F to +140°F)
• Storage Temperature Range: -20°C to +80°C
• Amplifier Compatibility: Pairs with E+L CV 22, DC 6000, DCS, or standard industrial strain gauge amplifiers
• Compliance & Certifications: CE marked, RoHS compliant, ISO 9001 quality certified.