IMA-Radiameter
Radial Force Measurement according to DIN 3761-9
The IMA-Radiameter is a proven benchtop measurement device for determining the radial force of radial shaft seals according to DIN 3761-9.
The device features two interchangeable measuring mandrels, one of which is radially movable. When a seal is placed on the mandrels, the radial force pushes the movable mandrel. The position is measured and actively returned to the nominal diameter. The radial force exerted by the seal is captured via a strain gauge load cell.
Diameter compensation ensures the radial force is always measured at the nominal diameter – a critical requirement for stiff seals such as PTFE seals, O-rings, or hydraulic seals.
Complies with established DIN 3761-9 standard. All moving parts are friction-free mounted via spring joints for highest precision.
The only commercial device with diameter compensation. Essential for stiff seals like PTFE, O-rings, or hydraulic seals.
Mandrels can be closed for easy seal placement, significantly reducing assembly force. Tool-less clamping system.
Version with thermal chamber available: integrated air heating up to 150°C, with external cooler and heat exchanger down to -40°C.
Windows-based LabView control with real-time display, configurable test plans, and data export.
Measuring mandrels configurable up to 300 mm test diameter. Force range from 0–30 N to 20–3,000 N by selecting appropriate load cell.
| Configurable force sensors | up to 3,000 N |
| Measurement method | Partial mandrel measurement per DIN 3761-9 |
| Interchangeable mandrels | Yes |
| Measurable seal diameter | up to 300 mm |
| Diameter-compensated design | Yes |
| Automated data acquisition | Yes |
| Easy-assembly mode | Yes |
| Data export | Text file |
| Sampling rate | 4 Hz |
| Power supply | 230 V / 110 V |
| Computer interface | USB 2.0 or higher |
| Dimensions (H × W × D) | 134 × 475 × 282 mm |
| Weight | 18 kg |
for seal production or seal assembly
Comparison before and after field tests
Long-term measurements over hours or days
different seal types or manufacturers
Identifying material properties for FEM simulations
Measurement with and without spring to separate spring and elastomer radial force
All technical details on the IMA-Radiameter as a PDF.
Precise, fast, and reproducible measurements – directly from research.
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