STF series
Key features
Fe-Cr-Al alloy gages are designed for the use in the widest operating temperature range. These bondable high-temperature wire strain gages are dedicated for measurements of deformations in the details of machinery and equipment, including jet engines, under static and dynamic loads up to +1150°C temperature range. Sensitive grid of the gage is made of 15…30 um diameter iron-chromium-aluminum alloy wire. Sensitive grid is fixed on the fiberglass-reinforced PTFE temporary backing. Lead wires are made of ribbon or round wire with 0.07…0.15 mm diameter. Material of the lead wires correlates with the sensitive grid material and is also iron-chromium-aluminum based.
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Characteristics
| Nominal parameters | Value |
| Sensitive grid material | Iron-chromium-aluminum |
| Possible number of sensitive elements | 1 |
| Base length, mm | 1.9-3.5 (.075"-.138") |
| Gage width, mm | 1.6-2.7 (.063"-.106") |
| Resistance, Ohm | 120-350 |
| Resistance deviation in batch, not more than | ±1% or ±3% |
| Lead wire material | Iron-chromium-aluminum |
| Lead wire diameter, mm | 0.07-0.15 (.0028"-.0059") |
| Lead wire type | Ribbon or round |
| Lead wire length, mm | 50-300 (1.97"-11.81") |
| Temporary carrier | Fiberglass-reinforced PTFE or filter paper |
| Average gage factor at 20°C | 2.3 |
| Fatigue life at ±650 ppm at 20°C, cycles | 106 |
| Bonding Methods | Ceramic Cement or Alumina flame spray |
| Max. working temperature | 1150°C (+2102°F) |
| Type of measurements | Static and dynamic |
