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Benefits
- Mechanical design and fixed gauge length ensure reliable and repeatable results under standard tensile testing conditions.
- Specifically designed to remain attached to the specimen even during fracture testing, eliminating the need for removal before test completion.
- Direct contact measurement principle ensures accurate and stable strain readings.
- Extensometer calibration service available.
| Parameter | Barrus MetalExt 20 | Barrus MetalExt 25 | Barrus MetalExt 50 | Barrus MetalExt 100 |
| Measurement principle | Contact (clip-on extensometer) | Contact (clip-on extensometer) | Contact (clip-on extensometer) | Contact (clip-on extensometer) |
| Application | Metals | Metals | Metals | Metals |
| Measurement type | Axial | Axial | Axial | Axial |
| Gauge length (Lo) | 20mm | 25mm | 50mm | 100mm |
| Deformation range (mm) | 5, 10, 25 mm | 5, 10, 25 mm | 5, 10, 25 mm | 5, 10, 25 mm |
| Accuracy | Class 1 (<1%) | Class 1 ( | Class 1 ( | Class 1 ( |
| Strain gauge resistance: | 350 Ω | 350 Ω | 350 Ω | 350 Ω |
| Bridge excitation voltage: | ≤ 6 V (DC or AC acceptable) | ≤ 6 V (DC or AC acceptable) | ≤ 6 V (DC or AC acceptable) | ≤ 6 V (DC or AC acceptable) |
| Output sensitivity: | approx. 2.3 mV/V | approx. 2.3 mV/V | approx. 2.3 mV/V | approx. 2.3 mV/V |
| Measurement to break | Can remain on specimen until break | Can remain on specimen until break | Can remain on specimen until break | Can remain on specimen until break |
| Level of automation | Low | Low | Low | Low |
| Specimen preparation | Not required | Not required | Not required | Not required |
| Sensor / measurement system | Mechanical | Mechanical | Mechanical | Mechanical |