GHSD-750 TE Macro Sensors DC LVDT

The GHSD-750-TE DC LVDT from Macro Sensors, distributed by Harold G. Schaevitz Industries (HGSI), is a rugged, spring-loaded linear position sensor engineered for precision displacement measurement and dimensional gaging in industrial environments. By combining proven Linear Variable Differential Transformer (LVDT) technology with integrated signal conditioning electronics, this sensor delivers accurate, repeatable position feedback in a compact and easy-to-install package.

Unlike traditional AC-operated LVDTs that require external electronics, the GHSD-750-TE incorporates built-in signal conditioning to provide a pre-calibrated DC output. This simplifies system integration, reduces installation complexity, and minimizes the number of components required in the measurement system.

The GHSD-750 Series is available in a wide range of measurement strokes, from ±0.020 inches up to ±2.00 inches, making it suitable for both fine-resolution gaging and broader displacement measurement applications.

Integrated DC Output for Simplified System Integration

One of the key advantages of the GHSD-750-TE is its internal signal conditioning circuitry. The sensor operates as a DC-LVDT, meaning that all necessary electronics for excitation, demodulation, and signal scaling are contained within the sensor body.

The internal electronics perform several critical functions:

• Provide stable AC excitation to the primary winding

• Process the differential AC signal from the secondary windings

• Demodulate the signal to determine both magnitude and direction of displacement

• Output a calibrated DC voltage signal proportional to position

This results in a sensor that can be directly connected to:

• PLC analog inputs

• Digital indicators and panel meters

• Data acquisition systems

• Computer-based measurement platforms

The standard output of 0 to ±10 VDC allows for straightforward integration without the need for external signal conditioners or additional calibration steps.

Spring-Loaded Design for Reliable Contact Measurement

The GHSD-750-TE features a spring-loaded probe shaft that maintains consistent contact with the measured surface. This design is especially beneficial in gaging and inspection applications where reliable contact is required for accurate measurements.

The probe shaft is guided by a precision sleeve bearing and connected directly to the LVDT core. The internal spring applies a controlled force—typically between 6 and 20 ounces depending on the measurement range—ensuring stable contact without introducing excessive load on the measured component.

This configuration provides several advantages:

• Consistent measurement contact across repeated cycles

• Reduced mechanical complexity compared to linkage-based systems

• Improved repeatability in automated measurement processes

High Accuracy and Exceptional Repeatability

In precision measurement applications, repeatability is often more important than absolute accuracy. The GHSD-750-TE excels in both areas, providing:

• Repeatability better than 0.01% of full range output

• Linearity better than ±0.25% of full range output

This high level of performance ensures that repeated measurements of the same position produce consistent results, which is essential for:

• Statistical process control (SPC)

• Automated inspection systems

• Quality assurance processes

Because the LVDT operates using non-contact electromagnetic principles, there are no sliding electrical contacts or wear surfaces. This eliminates common sources of drift and degradation found in contact-based sensors such as potentiometers.

Rugged, Hermetically Sealed Construction

The GHSD-750-TE is designed for durability in demanding industrial environments. Its construction includes:

• Stainless steel housing and probe shaft

• Hermetically sealed internal components

• Coil windings sealed to IEC IP-68 standards

This robust construction protects the sensor from:

• Moisture and humidity

• Dust and particulate contamination

• Exposure to industrial fluids and debris

The sealed design ensures long-term reliability and consistent performance even in challenging operating conditions.

Flexible Measurement Ranges

The GHSD-750 Series is available in multiple measurement ranges to suit a wide variety of applications:

• ±0.020 inches (±0.51 mm)

• ±0.050 inches (±1.25 mm)

• ±0.125 inches (±3.0 mm)

• ±0.250 inches (±6.3 mm)

• ±0.500 inches (±12.5 mm)

• ±1.00 inch (±25 mm)

• ±2.00 inches (±50 mm)

This range flexibility allows users to select the optimal sensor for their required measurement resolution and travel.

Standardized Output for Industrial Compatibility

The GHSD-750-TE provides a standardized DC output signal that is compatible with most industrial control systems:

• 0 to ±10 VDC output (standard)

This output can be easily interpreted by PLCs, data acquisition systems, and digital displays without additional conversion hardware. The factory-calibrated output ensures consistent scaling and eliminates the need for field adjustment.

Flexible Mounting and Installation

The sensor is designed for simple and reliable installation:

• 1/2-20 UNF threaded mounting body

• Supplied hex nuts for secure positioning

• Compact 3/4-inch diameter housing

These features allow the GHSD-750-TE to be easily integrated into:

• Gaging fixtures

• Automated inspection stations

• Test equipment and measurement systems

Interchangeable Contact Tip

The GHSD-750-TE is supplied with an AGD standard No. 9 contact tip made from chrome-plated hardened tool steel. This tip is fully interchangeable with other AGD-style contact tips, allowing users to customize the sensor for different surface types or measurement geometries.

Stable Performance Across Operating Conditions

The GHSD-750-TE is designed to maintain consistent performance across a range of environmental conditions:

• Operating temperature: 0°F to +160°F (–20°C to +70°C)

• Low thermal drift

• Resistance to environmental interference

These characteristics ensure reliable operation in manufacturing, laboratory, and field environments.

Typical Applications

The GHSD-750-TE is widely used in:

• Industrial gaging systems

• Electronic dial indicators

• Fabricated metal inspection

• Materials testing equipment

• Shaft runout (TIR) measurement

Its combination of high repeatability, durability, and ease of integration makes it well suited for both manual and automated measurement systems.

Why Choose a DC LVDT?

DC-LVDTs offer several advantages over traditional AC LVDT systems:

• Integrated electronics eliminate external signal conditioners

• Simplified wiring and installation

• Factory calibration ensures consistent output

• Reduced system complexity and cost

The GHSD-750-TE combines these advantages with rugged construction and precision measurement performance.