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Woodward 8904-484
Product Name: Linear Position Sensor (Woodward part 8904-484), cross-referenced to Macro Sensors HSD-750-1000-0393 DC-operated LVDT. (Note: Some Woodward distributor listings also classify 8904-484 as a digital speed governor / current-pressure converter; the verified hardware cross-reference points to the HSD-750-1000-0393 LVDT.)
Overview: A 3/4 in diameter sealed DC LVDT of the HSD-750 series, supplied as Woodward 8904-484. The HSD-750-1000 equivalent provides 1.0 in (25.4 mm) measurement range.
Detailed content
Technical Specifications:
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Series: HSD 750
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Supplied Woodward number: 8904-484
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Equivalent Macro Sensors model: HSD-750-1000-0393
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Measurement range: ±0.5 in (±12.5 mm) — 1.0 in full travel
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Input power: ±15 V DC, ±25 mA
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Full-scale output: 0 to ±10 V DC
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Output noise & ripple: < 10 mVrms
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Frequency response (−3 dB): 250 Hz (nominal)
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Linearity error: < ±0.25 % FRO
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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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Vibration tolerance: 20 g to 2 kHz
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Shock survival: 100 g, 11 ms
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Ingress protection: IEC IP-68, all stainless steel
Material & Structure: Fully stainless-steel sealed body; hermetic coil; axial sealed connector with mating plug.
Working Principle: Core displacement modulates inductive coupling; built-in DC electronics output a calibrated 0–±10 V DC signal proportional to position.
Application Scenarios: Valve position feedback, hydraulic cylinder positioning, turbine fuel-valve stem measurement, machine-tool and test-stand displacement.
Installation Requirements: Thread-body mount; core aligned to motion; use sealed mating connector; supply ±15 V DC; route the 0–±10 V DC output to the controller.
Usage Notes: Operate within ±15 V DC and temperature limits; preserve IP-68 sealing; avoid exceeding rated stroke or shock.
