Thermocouples

HARCO Innovative Solutions. Proven Performance®

HARCO's wide selection of thermocouple systems is designed to meet the highest standards of performance and durability under the most extreme conditions. Aerospace and industrial customers alike have relied on our custom capabilities for a solution designed and fabricated to their exact specifications. Whether you choose an off-the-shelf or customized thermocouple system, you’ll have confidence knowing that HARCO backs every product with the experience, expertise, and personalized attention you can always trust.

Features

• Application Specific Design
• Harsh Environment Operation
• Wide Temperature Range
• High Accuracy / Stability
• Fast Response Time
• Rugged Superalloy Construction
• High Shock Resistance
• Mineral Insulated Cable
• Ease of Installation
• Low Maintenance

Temperature Applications

• Exhaust Gas
• Power Turbine
• Compressor Discharge
• Brake Systems
• Bleed Air
• Bearings
• Lube / Hydraulic Oil
• Fuel / Inlet Air
• T2, T2.95, T3 Stations
• T4, T4.7 Stations

High Temperature Thermocouples

Thermocouple assemblies are available with an exposed junction for quick response time, an enclosed insulated junction for exhaust gas environments and replaceable element probes with a separate protective body and gas sampling ports. Rugged construction assures low life cycle cost and high reliability. They may be designed for averaging or individual multiple depth sensing. Characteristics include standard thermocouple alloy stud and nut output terminals and hermetically sealed connector or flexible leads. They are available in standard or custom thermocouple configurations and calibrations.

Associated high-temperature cable and connector designs are capable of operating up to 2000°F with consistent results. Our conductors are available in thermocouple alloys, nickel-plated copper alloy, optical fibers, or in any combination of these materials. Insulation materials are non-asbestos and perform in extreme temperatures. Outer metallic braids of stainless steel, nickel, or inconel can be applied to cables for enhanced abrasion protection.

Temperature Applications

• Exhaust Gas
• Power Turbine
• Compressor Discharge
• Brake Systems
• Bleed Air
• Bearings
• Lube / Hydraulic Oil
• Fuel / Inlet Air
• T2, T2.95, T3 Stations
• T4, T4.7 Stations

Integrated Thermocouple/Cable Assembly

The Integrated Thermocouple-Cable Assembly design features an overmolded transition at the cable to probe interface providing a moisture-proof seal to the probe. Coupled with the overmolded connector, the entire cable assembly is waterproof.

Features

• Incorporates EMI/RFI shielding
• Abrasion resistant jacketing of Teflon® spiral wrap

 

 

Rigid Thermocouple Rake Assembly

Custom-designed thermocouple rake assemblies provide a cost-effective solution for measuring critical temperature parameters in commercial and military aircraft, and industrial and marine gas turbines applications. Leveraging years of application experience, HARCO rake assemblies incorporate innovative design, superior construction, excellent performance, and proven reliability for installations around the world.

Features

• Application Specific Design
• Rugged Superalloy Construction
• Mineral Insulated Cable
• Hermetically Sealed
• Wide Temperature Range
• Fast Response Time
• High Shock Resistance
• OEM Spec Compliance
• Mulitiple Measurement Points
• Dual Channel
• Averaging/Individual Readings

Benefits

• Harsh Environmental Operation
• High Accuracy
• Excellent Stability
• Ease of Installation
• Low Maintenance
• Low-Cost Redundancy

EGT Probes

HARCO hermetically sealed exhaust gas temperature (EGT) probes have demonstrated consistent, trouble-free performance in installations around the globe. In typical applications, multiple EGT probes are connected to a single, flexible cable assembly. This provides the ability to easily replace individual probes—a distinct maintenance advantage over rigid thermocouple harnesses.

Features

• Temperature Range: -65°F to 2300°F
• Accuracy: ± 2°F from 32°F to 530°F, ±.4% from 530°F to 2000°F

 

Immersion Probes

HARCO's family of immersion probes are typically used for total temperature, stagnation, and direct reading applications. Temperature and/or pressure sensing can be incorporated in the same housing. Immersion probes provide specific or averaging of temperatures at multiple immersion depths with resistance balancing for true electrical average.

Features

• Individually replaceable sensors
• Enclosed or Exposed Junctions
• Temperature range of -65°F to 2300°

 

Cable Assemblies

HARCO Innovative Solutions. Proven Performance®

HARCO is recognized for the design, manufacture, and delivery of high-quality, yet cost-effective interconnection solutions. Overmolded connectors, development of specialty connectors, in-house capability to apply a variety of jacketing materials, open bundle configurations, flexible high temperature cables, flexible cable to rigid transition configurations and in-house braiding are just some of our capabilities. Our electrical, fiber optic, and thermocouple cable assemblies have been engineered and tested to perform under the most adverse conditions, from -100° F to +2000° F. It's no wonder you'll find these same solutions—stand-alone assemblies or custom sensor/cable combinations—being relied upon in mission-critical aerospace and industrial applications.

We have long applied our experience and technical ability to the production of electrical cable assemblies designed to perform under the most adverse conditions:

• Temperatures from -100° to +2000° F
• Water immersion up to 50 psi
• Vibration to 4000hz
• Shock to 125 g's
• Salt, fog, EMI/RFI, and abrasion
• Pass 10 days @ 98% humidity and MIL-STD-810 Vibration

In-Depth Design Experience

• Connectors and Accessories
• Patented Backshell Designs
• Electrical and Fiber Optic
• Wire/Cable Fabrication
• Aerospace and Industrial Applications

In-House Test and Evaluation

Electrical

• Connector Attenuation
• Insulation resistance: 500 megohms @ 500VDC
• AC and DC Dielectric testinig (Hi-Pot): <2ms @ 1500VAC
• Continuity: Cicuit-to-Circuit Verification
• Shield Impedance: <0.1 milliohms/fayinig surface

Environmental

• Vibration: Mil Std 810 and DO160 Random and Sinusoidal
• Humidity: 10 days 98% relative humidity
• Thermal Shock: -55°C to +260°C

Airframe Cables

Custom-designed airframe cables feature rubber-molded connector and repairable backshells. HARCO typically designs its own backshell hardware to be compatible with the application. The design allows for repair of the connector without the need to remove cable seals. The entire operation is user-friendly requiring no special tools, equipment, or power at the point of repair.

• Rubber-molded Connectors
• Repairable Backshells

 

 

On-Engine Cables

HARCO's custom-designed electrical cable assemblies are a cost-effective solution for the most demanding flight conditions. Benefitting from an engineered design that takes into account the operating environment, performance requirements and repairability, HARCO assemblies excel in a wide variety of engine applications. Superior design features, competitive pricing, and unmatched delivery performance make our cable assemblies the preferred choice for engine OEMs and major overhaul and maintenance facilities throughout the world.

Features

• Overmolded Backshells
• Braided Jackets
• Branched Assemblies
• Repairable Backshells

Benefits

• Vibration Damping
• Moisture Resistance
• Shock Resistance
• EMI/RFI Protection
• Abrasion Resistance
• Strain Relief
• Reduced System Weight
• Reduced Connector Count
• Field Repairability

Off-Engine Electrical Cables

HARCO's off-engine cable assemblies are ideal for ground-based gas turbine applications. We utilize stainless steel connectors over-molded to cable transitions, resulting in a robust design to meet gas turbine environmental requirements. Design options are offered with various abrasion-resistant outer jackets and cable/wire identification methods.

Features

• Temperature Range: up to 450°F
• Immersion-proof Designs
• Field-compatible Material Selections
• Low-impedance Signal Shielding

Case Study

Client: Argo Tech

Challenge:

To develop and manufacture custom wire harnesses that must withstand direct fuel immersion in a military application.

Solution:

Harco created a proposal, design concept and product prototypes that met Argo Tech's installation and performance requirements within the first week after contract award. Harco's knowledge of materials enabled the prompt selection of fluoroelastomer harnessing components and adhesives. These material selections, coupled with the implementation of new manufacturing processes at Harco, provided the ability to meet the customers design criteria of the application.

Results:

On-time delivery of the product leading to the customer's success in their initial qualification efforts on their Solenoid Fuel Cable and follow up business on a related program with similar requirements.

Air Data Systems

Downloads

HARCO Innovative Solutions. Proven Performance®

HARCO brings Innovative Solutions and Proven Performance to aerospace applications with our Air Data Systems.

We have the expertise to design, develop and manufacture components or a total air data system, providing the benefit of streamlining the process of component integration for our customers. A system design may include air data computers, pitot static, pitot angle of attack, dual heated static ports, total air temperature and outside air temperature sensors. Many of these are available as FAA TSO Authorized products. In addition to basic industry standards, HARCO's products comply with DO178 - Software Considerations in Airborne Systems and Equipment Certification; and DO160D Environmental Conditions and Test Procedures for Airborne Equipment. HARCO takes great pride in its reputation for exceptional service and solutions. Our existing portfolio has met the specific needs of existing customers and established a platform that lends itself to a solution base for our new customers.

Our product designs are always with performance and cost in mind. The same sensors can be utilized in pressurized and non-pressurized cabin areas using mounting hardware that eliminates the OEM’s need to supply additional hardware. 3D designs are matched to the OEMs aircraft skin to achieve aerodynamic performance and accuracy essential to RVSM certification. HARCO’s air data sensors are designed specifically to meet the performance, weight and cost requirements of the aviation market. Proprietary and patented technologies, materials and designs are employed to meet those requirements.

We’re committed to serving our civilian and military aerospace customers with customized solutions that exceed their expectations, now and in the years ahead.

Why HARCO

• Extensive portfolio of Air Data Sensors
• Portfolio includes Air Data Computers
• Air Data System Solutions
• RVSM compliant products
• Innovative, proprietary and patented product features
• Exceptional product design and development service

Total Air Temperature Sensors

HARCO is a proven supplier of total air temperature (TAT) sensors that enable computation of static air temperature and true airspeed. Our sensors are currently being used on U.S. military aircraft, as well as numerous derivative models. In addition to our wide range of in-stock sensors, we can customize features such as the mounting flange and connector, depending on your specific application. HARCO is one of only a few companies that can produce TAT technology sensors.

Features & Benefits

• Fuselage and engine TAT options
• Specially constructed to prevent de-icing heat from adversely affecting temperature output
• Special design requirements can be met

 

 

 

Pitot Probes

HARCO offers pitot, pitot static and pitot/angle-of-attack probes to help you design the air data system meeting your configuration and performance needs. We've applied out patented SIMx™ material to the pitot de-icing heaters, which has the benefit of extending the operational lifetime of this assembly. In addition, special hydrophobic coatings are applied to the surface to enhance its performance in icing conditions. The use of light weight materials is made possible by proprietary forming techniques for the joining of dissimilar metallic product components. Probes may be configured as stand alone with pneumatic outputs to the Air Data Computer, or they may integrate the computing function and eliminate the pneumatic connection.

Features & Benefits

The following pertains to part number 100564-XX shown:

• Light weight - 1.75 lbs. max
• De-Iced (TSO-C16)
• Fully supported heater monitoring and control functions
• Longer heater operating lifetime when SIMx is utilized
• 28VDC (9.0 ampere maximum)
• Integrated computing function option (TSO-C106)
• Software certified to DO178B level B
• Hardware certified to DO160E

Static Ports

Use of our Dual Static Ports reduces the number of components required on the aircraft to meet RVSM requirements. They provide a Dual Cross-Connected Static Source which provides a cost effective light weight solution with built in redundancy. The Dual Static Ports utilize an innovative application of solid state electronics to deliver heat for de-icing surfaces and extending the reliability and operational lifetime of the unit. HARCO has tested its static ports in an icing wind tunnel to prove compliance with the TSO-C16a and BS2G.

Features & Benefits

• Light weight - 0.7 lbs. max
• Dual Static Pressure Sensors
• De-Iced (two indipendent heaters)
• Optional heater monitoring outputs
• Longer heater operating lifetime utilizing solid state heaters
• 28VDC (2.5 ampere maximum to each heater)
• Hardware certified to DO160E

Air Data Computers

HARCO's air data computers compute a variety of functions such as Static Pressure, Total Pressure, Calibrated Airspeed, Mach, SAT, TAS, Altitude Rate, Airspeed Rate, and Pressure Ratio - any air data function can be added. In some unique applications, equivalent airspeed is calculated instead of calibrated airspeed. HARCO will be glad to work with you in determining the exact computer specifications for your application.

Features & Benefits

RVSM or AS8002 Compliant

Static Source Error Correction

Primary Power 28VDC (<2 watts)

Secondary Power 28VDC (<2 watts)

Signal Inputs/Outputs

RS422, RS485 or ARINC 429

Weight: 2.00 to .72 lbs.

TSO-C106

RTCA/DO-178B level B

RTCA/DO-160E

Outside Air Temperature Sensors

Downloads

Outside Air Temperature Detectors Data Sheet (pdf)

Harco manufactures three versions of Outside Air Temperature Sensors (OAT). The OAT Sensors are designed and fabricated to stringent standards utilizing integrated 3D modeling, comprehensive in-house aerodynamic test and evaluation facilities, and specialized manufacturing processes that include customized fine wire winding of sensing elements. OATs are a cost effective replacement for Total Air Temperature (TAT) sensors.

Features & Benefits

• The following pertains to part number 100366-XX shown:
• Non-de-iced Fuselage Mount (formation of ice inhibited by aerodynamic design)
• Rugged, Hermetically Sealed Construction
• Wide Temperature Range
• Low Excitation Current
• No Moving Parts
• DO-160 Environmental Compliance
• Custom Configurations
• Tip-sensitive Measurement (avoids the boundary layer

Sensors

HARCO Innovative Solutions. Proven Performance®

HARCO's custom-engineered sensors are designed for continued operation in the harshest environments. Applications include industrial land and marine-based gas turbines, commercial and military airframes and jet engines. All of our solutions are prototyped and tested in HARCO's fully equiped development laboratory where we can simulate extreme shock, vibration, and temperature conditions.

Why Harco

• High Accuracy
• Excellent Stability
• Low Maintenance
• High Reliability
• Rugged Construction

Resistance Temperature Detectors

Downloads

Resistance Temperature Detectors Data Sheet (pdf)

HARCO's resistance temperature detectors (RTDs) are engineered for the most exacting applications and environments. Ranging from the relatively benign environment of aircraft cabin temperature control to harsh turbine engine environments, HARCO RTDs deliver high-accuracy temperature detection and proven reliability. For example, these sensors can withstand temperatures as high as 3000°F when our proprietary SIMx technology is part of the design.

Features

• Application Specific Design
• High-Accuracy Platinum Wire-Wound Elements
• Hermetically Sealed Construction
• Low Excitation Current
• High Signal-to-Noise Ratio
• Fast Linear Response
• Excellent Stability
• Wide Temperature Range
• Low Maintenance
• High Reliability

Typical Applications

Temperature monitoring of critical aircraft components and subsystems such as:

• Engine Fuel
• Cabin Temperature Control
• Compressor Discharge
• Avionics
• Brake Pads
• Cylinder Heads
• Engine Bearing Oil
• Hydraulic Fluids
• Inlet Air Ducts

Speed Sensors

Magnetic speed sensors, designed by HARCO, convert motion into an electrical signal without the need for external power. Housed in a one-piece, lightweight, stainless steel assembly, our speed sensors provide extremely high accuracy and have no moving parts. Designed and manufactured to the highest quality standards, they are well-suited to harsh environment operation.

Features

• High Positional Accuracy
• Wide Speed Range
• Harsh Environment Operation
• Extended Temperature Range
• High Shock Resistance
• No Moving Parts/External Power Source
• Easy Installation
• Low-Cost Redundancy/Maintenance

Applications

HARCO speed sensors are used in gas turbine engines and gearbox assemblies in commercial and military aircraft. They are also equally suited for many industrial applications where harsh environments are expected. Typical applications include:

• Engine RPM
• Transmission Speed
• Multiple Engine Synchronization
• Engine Control Feedback
• Crankshaft Position Timing
• Wheel Speed

Air Flow Sensors

 

As a pioneer in sensor technology, HARCO offers a variety of sensors that can be customized for your particular environment or application. Our Electronic Flow Sensor is often used in the avionics cooling system for low flow detection and operates on the "thermal dispersion" principle where flow rate is proportional to the temperature of a heated element in cross-flow.

 

 

 

Special Applications

 

 

HARCO has the infrastructure and technologies to develop a sensor solution to meet your specific application. Next are two specific examples.

HARCO's electronic airspeed-altitude sensor was developed for the Naval Air Warfare Center and features dual airspeed channels with pressure sensors.

Our cooling effect sensor—ideal for supersonic military aircraft—provides a control signal for avionics cooling flow control. it incorporate numerous sensors including two RTD elements, one thermistor element, and a heating element.