Alcor from Tempest | Aircraft Sensors & Engine Monitoring Solutions

Factory Distributor for Alcor Sensors, Instruments, Test Equipment, Fuel Treatment & Accessories

Alcor Aviation Sensors & Engine Monitoring Systems

Airpart Supply is a factory-authorized distributor for Alcor, now part of Tempest Aero Accessories, specializing in precision aircraft temperature sensors and engine monitoring solutions for general aviation and commercial operators throughout Europe.

For over 50 years, Alcor has been a leader in exhaust gas temperature (EGT), cylinder head temperature (CHT), and turbine inlet temperature (TIT) sensor development. Recommended by major original equipment manufacturers (OEMs) of both digital engine monitors and aircraft, Alcor maintains a stellar reputation for high-quality precision probes compatible with the vast majority of engine monitoring systems.

Alcor sensors work seamlessly with both classic analog instrumentation and modern glass panel systems found in Cessna, Piper, Beechcraft, and other general aviation aircraft. The blanket Supplemental Type Certificate (STC) held by Alcor allows installation of probes in any aircraft with a reciprocating engine without complicated paperwork, streamlining maintenance operations and reducing downtime for aircraft operators.

As a European distributor serving general aviation and regional airline markets, we stock a comprehensive range of Alcor products including thermocouples, RTD sensors, test equipment, fuel treatment solutions, and replacement parts. Our Dublin-based facility ensures rapid delivery throughout the European Union with full technical support for aircraft maintenance engineers (AMEs) and aviation maintenance professionals.

Why Choose Alcor from Tempest Aviation Sensors?

Industry-Leading Heritage & Proven Reliability

With over 50 years of experience in aviation temperature sensor manufacturing, Alcor has established an unmatched reputation for quality and reliability in the general aviation industry. Recommended by major OEMs including Lycoming, Continental Motors, and leading avionics manufacturers, Alcor sensors are the preferred choice for aircraft operators who demand precision engine monitoring. The company's longevity and continuous innovation demonstrate their commitment to engineering excellence and customer satisfaction throughout decades of aviation technology evolution.

Universal Compatibility with All Major Engine Monitors

Alcor sensors work seamlessly with virtually every engine monitoring system available in general aviation, from classic analog gauges to modern glass panel avionics. Compatible brands include Garmin, Electronics International (EI), JPI (J.P. Instruments), Insight, and many others. This universal compatibility means maintenance facilities can standardize on Alcor sensors across their entire fleet regardless of avionics manufacturer, simplifying parts inventory and reducing training requirements for AME staff. Both grounded and ungrounded sensor types are available to match specific monitor requirements.

Simplified Installation with Blanket STC Coverage

The blanket Supplemental Type Certificate (STC) held by Alcor dramatically simplifies sensor installation in reciprocating engine aircraft. Unlike component-specific STCs that require extensive paperwork and approval processes, Alcor's blanket STC allows installation in any aircraft with a reciprocating engine without additional certification work. This regulatory advantage translates to significant time and cost savings for aircraft operators and maintenance facilities, reducing aircraft downtime and accelerating return to service. The simplified approval process is particularly valuable for fleet operators performing sensor upgrades across multiple aircraft types.

Comprehensive Product Range for Every Application

Alcor offers an extensive selection of temperature sensors covering virtually every installation scenario in piston-powered aircraft. Product options include multiple thermocouple types (Type E, Type J, Type K), various mounting configurations (bayonet, gasket, screw-in, clamp-on), different thread sizes (1/4" NPT, 1/8" NPT, 7/16"-20), probe lengths, and stagger options (normal, reverse). This comprehensive range ensures maintenance professionals can find the exact sensor specification required for every engine cylinder, exhaust port, and monitoring location. Whether performing routine sensor replacement or upgrading to advanced engine monitoring capabilities, Alcor has the right solution for Cessna, Piper, Beechcraft, and other general aviation aircraft.

Precision Engineering for Accurate Temperature Measurement

Alcor sensors are manufactured to extremely tight tolerance specifications ensuring accurate and repeatable temperature measurements critical for proper engine management. Each thermocouple is individually tested and calibrated before shipment, with published resistance specifications (typically ±0.10 Ω) that allow verification of sensor integrity during installation. This precision is essential for pilots and maintenance professionals relying on temperature data to identify cylinder imbalances, detect leaning issues, and prevent engine damage. The accuracy of Alcor sensors has made them the standard for engine monitor manufacturers who build their systems around Alcor's proven specifications. High-quality materials including Inconel sheaths and premium thermocouple wire ensure long-term stability and resistance to the harsh environment inside aircraft exhaust systems.

Rapid Response Time for Real-Time Monitoring

Fast sensor response time is critical for effective engine monitoring, allowing pilots to immediately detect temperature changes during critical flight phases. Alcor thermocouples feature optimized junction design and thin-wall construction that delivers rapid thermal response without sacrificing durability. This quick response enables real-time monitoring during takeoff, climb, cruise, and descent operations when engine parameters are changing rapidly. Pilots can instantly observe the effects of mixture adjustments, power changes, and cooling airflow variations, supporting proactive engine management and early detection of abnormal conditions. The fast response characteristic is particularly valued in aircraft operations requiring precise leaning procedures to maximize fuel efficiency while maintaining safe engine temperatures.

Rugged Construction for Long Service Life

Operating inside aircraft exhaust systems exposes temperature sensors to extreme conditions including high temperatures, thermal cycling, vibration, and corrosive exhaust gases. Alcor sensors are engineered with robust construction designed specifically to withstand these harsh environments. High-temperature alloy sheaths protect the delicate thermocouple junction, braided stainless steel overbraid shields the lead wires, and potted terminations prevent moisture intrusion. Quality materials and manufacturing processes result in sensors that deliver years of reliable service with minimal failures or drift. This durability reduces maintenance costs and unscheduled downtime while providing consistent performance throughout the sensor's operational life. Many operators report Alcor sensors lasting through multiple engine overhauls when properly installed and maintained.

Cost-Effective Performance & Value

While maintaining premium quality standards, Alcor sensors are competitively priced compared to alternative aviation temperature probes. The combination of reasonable acquisition cost, long service life, and universal compatibility delivers excellent value for aircraft operators and maintenance facilities. Standardizing on Alcor sensors across a fleet reduces parts inventory complexity and associated carrying costs. The blanket STC eliminates expensive engineering approval processes saving thousands in paperwork and certification fees. Most importantly, the reliability and accuracy of Alcor sensors help prevent costly engine damage by enabling early detection of problems before they become major failures. The total cost of ownership analysis clearly favors Alcor sensors for both individual aircraft owners and fleet operators managing multiple aircraft.

European Distribution & Technical Support

As a factory-authorized distributor serving the European market from our Dublin, Ireland facility, Airpart Supply maintains comprehensive stock of Alcor sensors, instruments, test equipment, and accessories for rapid delivery throughout the European Union. Our technical support team has extensive experience with Alcor products and can assist with sensor selection, installation questions, troubleshooting, and system integration. We provide complete documentation including installation instructions, wiring diagrams, and airworthiness certificates required for European aircraft maintenance. Our strategic location ensures efficient logistics and competitive shipping costs to mainland Europe, the UK, and Ireland. Beyond product supply, we offer application support helping AMEs and maintenance facilities optimize engine monitoring installations across diverse aircraft types and engine configurations. Contact our team at [email protected] or +44 (0)1494 450366 for technical assistance and product availability.

Alcor Thermocouple Specifications & Technical Information

Thermocouple Types Available

• Type E Thermocouples: Chromel-Constantan junction with red and brown color coding. Commonly used in older engine monitoring systems. Higher output voltage compared to Type K. Typical resistance specifications around 0.85-0.97 Ω.
• Type J Thermocouples: Iron-Constantan junction with black and yellow color coding. Popular for CHT applications in certain aircraft models. Resistance typically 0.13-0.24 Ω depending on configuration. Available in grounded versions for fast response.
• Type K Thermocouples: Chromel-Alumel junction with red and yellow color coding. Most common type in modern engine monitors. Wide temperature range and excellent linearity. Available in both grounded and ungrounded configurations. Resistance ranges from 0.65-1.60 Ω depending on length and design.

Mounting Configurations & Applications

• Bayonet Mount (3/8-24): Quick-disconnect style mounting used primarily for cylinder head temperature measurement. Spring-loaded design ensures good thermal contact. Common on Lycoming engines and many Continental models.
• Gasket Mount (18mm): Installs under spark plug with sealing gasket. Eliminates need for separate CHT probe boss. Popular on aircraft with limited space around cylinders. Provides accurate cylinder temperature readings.
• Screw-In Mount: Threaded installation in exhaust port or cylinder head. Available in multiple thread sizes: 1/4" NPT (most common for EGT), 1/8" NPT (compact installations), 7/16"-20 (larger engines). Includes straight and angled (8°, 90°) probe orientations.
• Clamp Mount: Wraps around exhaust pipe exterior. Available for various pipe diameters (2.35" max, 3-1/4" max, 3-3/8" max). Ideal for turbocharged applications or retrofit installations where exhaust drilling is impractical.

Grounded vs. Ungrounded Junction Design

Grounded thermocouples have the junction welded to the probe sheath, providing faster response time but potentially susceptible to electrical noise in some installations. Most general aviation applications use grounded sensors for rapid temperature indication during flight operations.

Ungrounded thermocouples have the junction isolated from the sheath, providing superior noise immunity at the expense of slightly slower response. Required by certain engine monitor manufacturers to prevent ground loop issues in complex avionics systems.

Normal vs. Reverse Stagger Configuration

On multi-cylinder engines, individual cylinders often have offset thermocouple ports to package all probes and wiring efficiently. Normal stagger sensors have the junction at the standard depth from mounting surface, while reverse stagger sensors have extended reach to accommodate recessed ports. Proper stagger selection ensures consistent probe depth and accurate comparative readings across all cylinders. Consult engine-specific installation documentation or contact our technical team for stagger requirements on your particular engine model.

Alcor Sensor Applications by Aircraft & Engine Type

General Aviation Single-Engine Aircraft

Alcor sensors are widely installed in popular single-engine aircraft including Cessna 150, 152, 172, 182, 206, 210 models; Piper Cherokee, Warrior, Archer, Arrow, Dakota, Saratoga series; Beechcraft Bonanza, Debonair, Sierra, and Musketeer variants; Cirrus SR20 and SR22 models; Mooney M20 series; Diamond DA40 and DA42; and many experimental aircraft. These installations typically monitor CHT on each cylinder plus EGT from each exhaust port, providing comprehensive engine condition awareness for single-pilot operations.

Light Twin-Engine Aircraft

Twin-engine installations benefit significantly from Alcor's comprehensive monitoring capability, with sensors on both engines. Common applications include Piper Seneca, Seminole, Aztec, Navajo, Chieftain; Cessna 310, 340, 414, 421; Beechcraft Baron, Duke, Queen Air; Piper Aerostar; and Partenavia P.68. The ability to compare temperatures between engines as well as between cylinders on each engine provides valuable diagnostic information for identifying rigging issues, induction leaks, and engine health trends.

Turbocharged & High-Performance Aircraft

Turbocharged engines require especially careful temperature monitoring due to higher operating temperatures and the additional complexity of turbocharger systems. Alcor sensors excel in these demanding applications including turbocharged versions of Cessna 182RG, T210, 340, 414, 421; Piper Turbo Arrow, Turbo Saratoga, Malibu, Mirage; Beechcraft Turbo Bonanza; Cirrus SR22T; Mooney Acclaim; and pressurized cabin twins. TIT (Turbine Inlet Temperature) monitoring using Alcor clamp-on sensors is critical for preventing turbocharger damage and optimizing performance.

Engine Types & Manufacturers

• Lycoming Engines: O-235, O-320, O-360, IO-360, O-540, IO-540, TIO-540 series and other Lycoming piston engines. Alcor sensors match OEM specifications and mounting configurations.
• Continental Motors: O-200, IO-240, O-300, IO-360, IO-520, IO-550, TSIO-520 series and other Continental engines. Compatible with factory and aftermarket engine monitor systems.
• Rotax Engines: 912, 914, 915 series used in light sport aircraft and modern ultralights. Alcor offers appropriate sensors for these compact water-cooled engines.
• Experimental & Homebuilt: Franklin, Jabiru, UL Power, and automotive conversions. Alcor's versatile mounting options accommodate custom installations.

Engine Monitor Compatibility | Universal Sensor Integration

Alcor sensors work seamlessly with virtually every engine monitoring system available in general aviation. Proven compatibility includes:

• Garmin Engine Indication Systems: GI 275, G3X Touch, G500 TXi, G600 TXi, and legacy analog gauges. Alcor is a recommended sensor supplier in Garmin installation documentation.
• Electronics International (EI): MVP-50, CGR-30P, UBG-16, R-1 Tachometer, and other EI instruments. Long-standing partnership ensures perfect compatibility.
• JP Instruments (JPI): EDM-900, EDM-830, EDM-730, EDM-700, JPI 930, and legacy JPI systems. Alcor sensors meet JPI's stringent specifications.
• Insight Instrument Corporation: G Series, GEM 610, GEM 612, and analog instrumentation. Alcor has supplied Insight for decades.
• Dynon Avionics: SkyView, Dynon HDX, D10A, D100, and EFIS-D systems popular in experimental aircraft. Full compatibility with Dynon's engine monitoring modules.
• Factory OEM Instrumentation: Original equipment gauges from Cessna, Piper, Beechcraft, Cirrus, and other manufacturers.

When selecting Alcor sensors for your engine monitor, note whether your system requires grounded or ungrounded thermocouples and confirm the appropriate thermocouple type (E, J, or K). Our technical support team can assist with proper sensor selection for your specific monitor model and aircraft installation.

Complementary Products for Complete Engine Monitoring Systems

Alcor from Tempest offers a complete ecosystem of engine monitoring products beyond temperature sensors:

Tempest Aviation Product Lines

• Tempest Spark Plugs: Premium aviation spark plugs including fine wire and massive electrode designs for Lycoming and Continental engines.
• Tempest Oil Filters: High-capacity oil filters with superior filtration for engine protection and oil analysis capabilities.
• Tempest Accessories: Complete line of engine accessories including hoses, clamps, and maintenance supplies from the Tempest Aero Accessories family.

Related Engine Products Available from Airpart Supply

• Champion Slick Magnetos: New and rebuilt magnetos for complete ignition system service alongside temperature monitoring upgrades.
• Champion Oil Filters: Alternative to Tempest filters, offering broad compatibility with piston engines.
• Lycoming Engine Parts: Factory new and PMA replacement parts for Lycoming engines requiring sensor installation support components.
• Continental Engine Parts: OEM and approved parts for Continental engines undergoing engine monitor system installations.
• AvStar Fuel Systems: Carburetors and fuel injection components for optimized fuel delivery monitored by Alcor sensors.
• Aircraft Hardware: Mounting hardware, safety wire, and installation supplies for sensor system installations.

Installation Guidelines & Maintenance Best Practices

Proper Installation Techniques

CHT Bayonet Sensors: Ensure clean mounting surface free of carbon deposits. Install with gentle twisting motion until seated. Use anti-seize compound sparingly on threads if specified by manufacturer. Avoid over-tightening which can damage the spring retention mechanism.

EGT Screw-In Probes: Drill and tap exhaust ports perpendicular to gas flow for maximum accuracy. Use proper NPT thread sealant rated for high temperature (not Teflon tape). Torque to manufacturer specifications - typically 12-15 ft-lbs for 1/4" NPT. Position probe junction in exhaust gas stream but not protruding excessively into flow.

Clamp-On Probes: Position on straight section of exhaust pipe away from bends and welds. Clean pipe surface before installation. Tighten clamp evenly to ensure good thermal contact. Monitor initial readings to confirm proper placement - similar temperatures across cylinders indicate correct installation.

Wiring & Connector Best Practices

Route thermocouple leads away from ignition wiring to minimize electromagnetic interference. Use provided strain relief boots where leads exit high-temperature areas. Avoid sharp bends that could damage wires. Secure leads with adel clamps or ty-wraps at regular intervals preventing vibration damage. Maintain proper polarity when connecting to engine monitor - reversed leads will show incorrect temperatures. Use terminal crimping tools designed for thermocouple wire to ensure reliable connections.

Periodic Inspection & Troubleshooting

Inspect sensor leads during annual inspection for signs of heat damage, chafing, or corrosion. Check mounting security - loose sensors give erratic readings. Verify connector condition and cleanliness. If temperature readings seem abnormal, use Alcor test equipment to verify sensor resistance matches published specifications. Compare readings between cylinders - significant variations may indicate sensor issues, induction leaks, or actual engine problems. Document sensor readings over time to identify degradation trends before complete failure occurs.

Replacement Intervals & Failure Modes

Alcor sensors typically provide many years of service when properly installed and maintained. Common failure modes include open circuits (sensor reads maximum or shows error code), short circuits (reads zero or minimum), and drift (inaccurate readings compared to known good sensors). Replace sensors showing these symptoms. Consider proactive replacement during engine overhaul even if sensors test acceptable - the cost is minimal compared to engine work and ensures reliable monitoring for the next operational period. Always replace sensors in complete sets rather than mixing old and new sensors which can complicate cylinder-to-cylinder comparisons.

Contact Airpart Supply for Alcor Temperature Sensors & Aviation Products

As a factory-authorized distributor serving Europe from Dublin, Ireland, we stock comprehensive Alcor sensor ranges with expert technical support for aircraft maintenance professionals.

Phone: +44 (0)1494 450366

Email: [email protected]

Your European source for precision Alcor aviation temperature sensors and Tempest products.