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Woodward 8904-303
Product Name: Linear Position Sensor (Woodward part 8904-303), cross-referenced to Macro Sensors VRT-1250-4000-0787 DC-operated LVDT.
Overview: A 1.25 in (31.75 mm) diameter DC LVDT from the Macro Sensors VRT-1250 family, supplied under the Woodward number 8904-303. Designed for heavy-duty linear position measurement where a larger body and extended stroke are needed.
Detailed content
Technical Specifications:
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Series: VRT-1250 (1.25 in / 31.75 mm body)
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Supplied Woodward number: 8904-303
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Equivalent Macro Sensors model: VRT-1250-4000-0787
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Stroke class: 4000-thou (4.0 in / 101.6 mm travel)
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Output: pre-calibrated DC (0–±10 V DC class, per VRT family)
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Excitation: DC input, integrated signal conditioning
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Linearity: ≤ ±0.25 % FS (family specification)
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Repeatability: < 0.01 % FSO; Hysteresis: < 0.01 % FSO
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Operating temperature: −20 °C to +70 °C
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Ingress protection: IEC IP-68
Material & Structure: Stainless-steel body with sealed coil assembly; axial or radial sealed connector.
Working Principle: Same DC-LVDT principle as 8904-238 — core displacement modulates inductive coupling; built-in electronics output a calibrated DC signal proportional to position.
Application Scenarios: Large actuator stroke feedback, turbine fuel-valve position, compressor guide-vane position, heavy compressor and turbomachinery servomechanisms.
Installation Requirements: Use the 1.25 in body with appropriate mounting blocks; ensure core freedom of motion; use matched connector.
Usage Notes: Do not exceed the rated stroke; protect the connector from moisture ingress; operate within the published temperature band.
