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Woodward 8904-444
Product Name: Linear Position Sensor (Woodward part 8904-444), cross-referenced to Macro Sensors HSD-750-500-0353 DC-operated LVDT.
Overview: A short-stroke 3/4 in diameter DC LVDT of the HSD-750 family, supplied under Woodward 8904-444. The HSD-750-500 equivalent gives a 0.5 in (12.7 mm) travel class, suited for compact actuator feedback.
Detailed content
Technical Specifications:
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Series: HSD 750
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Supplied Woodward number: 8904-444
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Equivalent Macro Sensors model: HSD-750-500-0353
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Measurement range: ±0.25 in (±6.3 mm) — 0.5 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: Sealed stainless-steel body; hermetic coil winding; axial sealed connector.
Working Principle: Inductive core-position sensing with integrated DC electronics producing a calibrated DC output.
Application Scenarios: Compact valve-stem feedback, small actuator position, servo-position loops, machine-tool and test-stand displacement measurement.
Installation Requirements: Thread-body mounting; core aligned to motion axis; use the supplied mating connector; wire ±15 V DC and output to the control system.
Usage Notes: Keep within stroke and temperature limits; maintain sealing integrity; avoid side loads on the core.
