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Woodward 8904-418
Product Name: Linear Position Sensor (Woodward part 8904-418), cross-referenced to Macro Sensors HSD-750-1000-0393 DC-operated LVDT.
Overview: A 3/4 in (19 mm) diameter sealed DC LVDT from the Macro Sensors HSD-750 series, supplied as Woodward 8904-418. The HSD-750-1000 equivalent provides a 1.0 in (25.4 mm) measurement range.
Detailed content
Technical Specifications:
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Series: HSD 750 (3/4 in / 19 mm diameter)
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Supplied Woodward number: 8904-418
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Equivalent Macro Sensors model: HSD-750-1000-0393
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Measurement range: ±0.5 in (±12.5 mm) — full 1.0 in 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 % of FRO
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Repeatability: < 0.01 % FSO; Hysteresis: < 0.01 % FSO
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Operating temperature: 0 °F to +160 °F (−20 °C to +70 °C)
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Thermal coefficient of scale factor: −0.015 %/°F (nominal)
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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 sealed body
Material & Structure: Fully stainless-steel sealed body; coil windings hermetically sealed; axial sealed connector with mating plug supplied.
Working Principle: The moving core changes the inductive coupling; built-in DC electronics provide a pre-calibrated 0–±10 V DC output proportional to position, eliminating external signal conditioners.
Application Scenarios: Valve position feedback, hydraulic cylinder positioning, machine-tool locating, material-test extensometers, corrosive-environment displacement measurement.
Installation Requirements: Mount via the 3/4 in threaded body; align the core without side loading; connect the supplied sealed connector; wire ±15 V DC and the 0–±10 V DC output to the PLC/indicator.
Usage Notes: Maintain ±15 V DC supply within tolerance; keep within the −20 °C to +70 °C range; preserve IP-68 sealing; avoid mechanical shock beyond 100 g.
