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Donut/Through Hole Load Cell

Robust and accurate with high resistance to off-axis loads

Application Use

The LTH350 Through Hole Donut/Washer Load Cell is a miniature, low-profile sensor designed for compression applications requiring the load structure to pass through the sensor such as bolt clamping force measurement.  

Design

Its compact dimensions, lightweight, and flexible inner diameter enable seamless integration into space-constrained setups without adding significant bulk to the assembly. The custom full bridge strain gauge and unique monolithic gauge design reduce output errors from extraneous/off-axis loads. Its low power consumption makes it ideal for battery-operated applications or setups where minimizing heat generation is crucial.

LTH350’s durable 17-4 PH stainless steel construction and operational temperature from -60°F to 200°F (-50°C to 93°C) make it ideal for demanding environments. Its low deflection of 0.002 in (0.05 mm) nominal satisfies applications that require a fast dynamic response. The load cell is RoHS compliant and  features an integrated 4-pin micro connector for easy cable connection and disconnection.

Calibration and Customization

FUTEK’s ISO-certified calibration lab offers multiple options to ensure precision, reliability, and seamless integration with various instruments. For customized solutions or highly specialized applications such as extreme temperatures, radiation, vacuum/low outgassing, or high vibration/shock environments, please contact FUTEK. A customized version of the LTH family of sensors resides in Nasa’s Curiosity Mars rover. Manufactured by FUTEK in 2008, it continues to provide accurate drilling force measurements in extreme Martian conditions.

LTH350 is a miniature, low-profile donut or through-hole load cell for applications that require the load structure to pass through the sensor. It features multiple strain gauges that optimize the model’s performance and significantly reduces the influence of extraneous loads.

LTH350 is ideal for inline applications with limited space that require a sensor that can handle eccentric loads and still maintain a high level of accuracy and reliability. It features an integrated 4-pin micro connector for easy cable connection and disconnection. This model can also be modified to suit OEM applications. FUTEK offers application and engineering resources during DFM/DFX stage upon request.

Small footprint

At 0.5in (12.7mm) height and 1.48in (37.6mm) diameter, these miniature sensors fit into applications that require a very small footprint. The units are offered in a variety of inner diameter sizes from 1/4in to 5/8in (6.35 to 15.9mm). The lightweight models weigh 3.5oz (99g).

Powerful performance

The proprietary design, coupled with FUTEK’s sophisticated metal foil strain gauge technology, guarantees high accuracy and repeatability. The extra strain elements inside the sensor ensures high sensitivity and accurate measurements to off-axis loads, even in high extraneous load conditions. This allows you to mount the sensor in different rotational patterns, orienting the sensors to suit your system design, and still collect reliable, and accurate measurements.

Robust construction

The sensors are conformally coated inside with a silicone dielectric gel, which absorbs shock and vibration, ensuring that the interconnected wires do not fatigue or fail. The coating also provides environmental protection against any ingress, improving product life. Welded isolation diaphragms add another level of robustness and protection against outdoor or washdown environments. The overall design qualifies for IP64 rating.

Through-hole mounting

LTH350 model has a through hole with an inner hub that allows the load to be attached. The outer diameter has a hub on the bottom base, where the unit is to be supported. The diaphragm between the loading point (ID) and the mounting point (OD) is where the strain is measured. Typically, a bolt or any other component connected to the load passes through the ID.

Plug in, plug out

The LTH350 is now offered with an integrated 4-pin micro connector, which allows for easy and simple cable connection and disconnection. A damaged sensor cable can be replaced without having to replace or disassemble the sensor or any other system component, which saves time, leads to higher system availability, and reduces the total cost of ownership. It also simplifies the installation process, reducing installation time and maximizing up time.

Best-in-class materials

The exceptional quality of LTH350 makes it highly durable, robust, and reliable. Its body is made of aerospace-grade 17-4PH stainless steel, which provides high strength, high hardness, and corrosion resistance over a wide temperature range.

Recommended applications

FUTEK’s LTH series sensors are ideally suited for applications such as press, inline compression applications, bolt fastening, toggle force clamp measurement, overload monitoring, post or leg mount, rolling mill systems, nut runner force/torque monitoring, and dual tank level controllers. Being miniature, highly robust, and reliable, these sensors are featured in NASA’s Orion deployment mechanism.

Calibration included

The LTH350 has been tested by FUTEK’s world-class calibration department and is NIST traceable. We can also reduce hidden costs and setup time by calibrating your sensor with FUTEK electronics of your choice. In addition, we offer calibration to ANSI Z540-1 and ISO 17025 standards upon request.

Made in Irvine, CA

Designed and manufactured in-house. Our multidisciplinary engineering teams, high precision machining center, state-of-the-art quality assurance systems, and R&D and manufacturing facilities are all under one roof, allowing us to continuously reinvent and refine our products and processes.

Robust and accurate with high resistance to off-axis loads

Application Use

The LTH350 Through Hole Donut/Washer Load Cell is a miniature, low-profile sensor designed for compression applications requiring the load structure to pass through the sensor such as bolt clamping force measurement.  

Design

Its compact dimensions, lightweight, and flexible inner diameter enable seamless integration into space-constrained setups without adding significant bulk to the assembly. The custom full bridge strain gauge and unique monolithic gauge design reduce output errors from extraneous/off-axis loads. Its low power consumption makes it ideal for battery-operated applications or setups where minimizing heat generation is crucial.

LTH350’s durable 17-4 PH stainless steel construction and operational temperature from -60°F to 200°F (-50°C to 93°C) make it ideal for demanding environments. Its low deflection of 0.002 in (0.05 mm) nominal satisfies applications that require a fast dynamic response. The load cell is RoHS compliant and  features an integrated 4-pin micro connector for easy cable connection and disconnection.

Calibration and Customization

FUTEK’s ISO-certified calibration lab offers multiple options to ensure precision, reliability, and seamless integration with various instruments. For customized solutions or highly specialized applications such as extreme temperatures, radiation, vacuum/low outgassing, or high vibration/shock environments, please contact FUTEK. A customized version of the LTH family of sensors resides in Nasa’s Curiosity Mars rover. Manufactured by FUTEK in 2008, it continues to provide accurate drilling force measurements in extreme Martian conditions.

LTH350 is a miniature, low-profile donut or through-hole load cell for applications that require the load structure to pass through the sensor. It features multiple strain gauges that optimize the model’s performance and significantly reduces the influence of extraneous loads.

LTH350 is ideal for inline applications with limited space that require a sensor that can handle eccentric loads and still maintain a high level of accuracy and reliability. It features an integrated 4-pin micro connector for easy cable connection and disconnection. This model can also be modified to suit OEM applications. FUTEK offers application and engineering resources during DFM/DFX stage upon request.

Small footprint

At 0.5in (12.7mm) height and 1.48in (37.6mm) diameter, these miniature sensors fit into applications that require a very small footprint. The units are offered in a variety of inner diameter sizes from 1/4in to 5/8in (6.35 to 15.9mm). The lightweight models weigh 3.5oz (99g).

Powerful performance

The proprietary design, coupled with FUTEK’s sophisticated metal foil strain gauge technology, guarantees high accuracy and repeatability. The extra strain elements inside the sensor ensures high sensitivity and accurate measurements to off-axis loads, even in high extraneous load conditions. This allows you to mount the sensor in different rotational patterns, orienting the sensors to suit your system design, and still collect reliable, and accurate measurements.

Robust construction

The sensors are conformally coated inside with a silicone dielectric gel, which absorbs shock and vibration, ensuring that the interconnected wires do not fatigue or fail. The coating also provides environmental protection against any ingress, improving product life. Welded isolation diaphragms add another level of robustness and protection against outdoor or washdown environments. The overall design qualifies for IP64 rating.

Through-hole mounting

LTH350 model has a through hole with an inner hub that allows the load to be attached. The outer diameter has a hub on the bottom base, where the unit is to be supported. The diaphragm between the loading point (ID) and the mounting point (OD) is where the strain is measured. Typically, a bolt or any other component connected to the load passes through the ID.

Plug in, plug out

The LTH350 is now offered with an integrated 4-pin micro connector, which allows for easy and simple cable connection and disconnection. A damaged sensor cable can be replaced without having to replace or disassemble the sensor or any other system component, which saves time, leads to higher system availability, and reduces the total cost of ownership. It also simplifies the installation process, reducing installation time and maximizing up time.

Best-in-class materials

The exceptional quality of LTH350 makes it highly durable, robust, and reliable. Its body is made of aerospace-grade 17-4PH stainless steel, which provides high strength, high hardness, and corrosion resistance over a wide temperature range.

Recommended applications

FUTEK’s LTH series sensors are ideally suited for applications such as press, inline compression applications, bolt fastening, toggle force clamp measurement, overload monitoring, post or leg mount, rolling mill systems, nut runner force/torque monitoring, and dual tank level controllers. Being miniature, highly robust, and reliable, these sensors are featured in NASA’s Orion deployment mechanism.

Calibration included

The LTH350 has been tested by FUTEK’s world-class calibration department and is NIST traceable. We can also reduce hidden costs and setup time by calibrating your sensor with FUTEK electronics of your choice. In addition, we offer calibration to ANSI Z540-1 and ISO 17025 standards upon request.

Made in Irvine, CA

Designed and manufactured in-house. Our multidisciplinary engineering teams, high precision machining center, state-of-the-art quality assurance systems, and R&D and manufacturing facilities are all under one roof, allowing us to continuously reinvent and refine our products and processes.