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The Adjustable Arm Subject’s Chair Wired with Activity Sensors from Lafayette Instrument Company is designed for professional polygraph and credibility assessment environments. It combines ergonomic comfort with advanced sensor integration to ensure accurate activity monitoring of examinees throughout the testing process.
Manufactured to Lafayette’s exacting standards, this chair is compatible with the company’s LX6, LX5000, and LX4000 polygraph systems and can be configured with seat, arm, and optional foot activity sensors.
Purpose and Application
The chair is specifically engineered for:
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Polygraph examinations – Providing stable, comfortable seating while detecting physical movements that may affect data.
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Forensic interviews – Ensuring reliable subject monitoring.
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Credibility assessment research – Supporting controlled study environments.
The integrated sensors detect subtle and gross movements in the arms, seat, and feet, transmitting the data to the examiner via Lafayette’s Sensor Mixer Box and polygraph Data Acquisition System (DAS).
Key Features
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Adjustable arm height with integrated activity sensors.
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Durable, ergonomic design for long-duration sessions.
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Seat, arm, and optional foot sensors for comprehensive subject monitoring.
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Direct compatibility with LX6, LX5000, and LX4000 polygraph systems.
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Stable base and reinforced frame for examiner and subject safety.
Included Components
The chair ships with all required structural parts, integrated cabling for activity sensors, and necessary mounting hardware.
Included hardware components:
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Heavy hex nuts, lock washers, and socket head cap screws.
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Shoulder bolts and clevis/cotter pins for backrest assembly.
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Knobs for arm height adjustment and support plate attachment.
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Cables for seat and arm activity sensors.
Assembly Overview
While the full setup procedure is outlined in the official manual, the assembly can be summarized as follows:
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Attach Angles to the Seat – Using socket head cap screws, lightly secure brackets for later adjustment.
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Install Legs and Tube Assembly – Align with thicker seat portion toward rear, ensuring sensor cables are routed correctly.
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Insert Arm Adjustment Mechanism – Slide square nuts into frame channels and fit height-adjustment knobs.
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Attach Backrest – Use clevis pins and cotter pins for secure pivot, then tighten all frame bolts.
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Install Arm Supports and Cushions – Route arm sensor cables through the frame and attach cushions at desired height.
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Cable Management – Route seat and arm sensor leads to the Sensor Mixer Box for proper connectivity.
Sensor Connectivity
Seat Sensor
Cable runs from seat cushion through the frame tube to the Mixer Box input labeled “FROM SEAT.”
Arm Sensors
Cables connect to Mixer Box inputs labeled “FROM ARMS” (either side may be used).
Foot Activity Sensor (Model 76870FS) – Optional
Connects via cable routing in left chair leg to Mixer Box input labeled “FROM FEET.”
Sensor Mixer Box – Model 76879M
The Sensor Mixer Box allows examiners to configure movement signal outputs:
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ALL – Combines arms, seat, and feet on a single channel.
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SEAT – Outputs seat sensor only.
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FEET – Outputs foot sensor only.
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ARMS – Outputs arm sensors only.
Connection to Polygraph Systems:
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LX6: Fischer connector or 3.5mm stereo cable.
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LX5000: Fischer connector (Model 76878CBL-6) or 3.5mm stereo cable.
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LX4000: Cat5E cable (Model 76878CBL) or 3.5mm stereo cable.
Safety & Operating Notes
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Always support arm cushions when loosening adjustment knobs to prevent sudden drops.
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Ensure all bolts are tightened before use.
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Avoid pulling or twisting sensor cables to prevent internal damage.
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Check connections before each session to ensure accurate movement recording.
Warranty and Support
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Limited Warranty: One year on parts and workmanship under normal use conditions.
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Exclusions: Consumables (electrodes, gaskets, tubing), damage from misuse, improper installation, or unauthorized repairs.
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Repairs: Require a Return Materials Authorization (RMA) from Lafayette Instrument Company.
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Technical Support: Provided for the lifetime of the product.
Ordering Information
Manufacturer:
Lafayette Instrument Company
3700 Sagamore Parkway North
Lafayette, IN 47904, USA
Tel: (765) 423-1505
Email: [email protected]
Website: www.lafayetteinstrument.com
When placing an order, include:
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Quantity and part number.
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Product description.
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Purchase order number or payment method.
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Tax status and exemption documentation if applicable.
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Shipping and billing addresses.
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Contact details of the authorized purchaser.
Conclusion
The Adjustable Arm Subject’s Chair Wired with Activity Sensors is a specialized tool for professional polygraph and credibility assessment work. Combining ergonomic design, adjustable components, and precision movement detection, it ensures both subject comfort and uncompromised data quality.
Its integration with Lafayette’s LX-series polygraph systems and sensor technologies makes it a vital component for any serious examiner seeking comprehensive, reliable subject monitoring in investigative and research settings.
