M-111 - J.P. Instruments FAA-PMA EGT Probe Kit 1280

M-111-1280 – J.P. Instruments EGT Probe Kit (FAA-PMA)

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The J.P. Instruments (JPI) M-111-1280 is an FAA-PMA certified Exhaust Gas Temperature (EGT) probe kit, featuring the widely used M-111 style probe (often JPI P/N 1080). This flight-critical sensor assembly is engineered for use with JPI's advanced engine monitoring systems, providing pilots with precise, real-time temperature data from the engine's exhaust stream. Its primary function is to measure the temperature of the exhaust gases exiting a specific cylinder, enabling accurate fuel mixture leaning for optimal efficiency and power, and providing vital data for engine health diagnostics.

Engineered for extreme reliability in the harsh exhaust environment, this probe utilizes a Type K (Chromel-Alumel) thermocouple junction housed within a robust, high-temperature alloy sheath. The accuracy and rapid response time of JPI probes are essential for modern engine management techniques, including precise leaning to peak EGT or lean/rich of peak operations. As an FAA-PMA certified kit from the leader in engine data monitoring, it guarantees the correct calibration, materials, and performance required for safe and efficient engine operation.

Key Features

• FAA-PMA Certified: Approved by the FAA, ensuring airworthiness and compatibility with specified JPI engine monitoring systems.

• M-111 Style Probe (JPI P/N 1080): Industry-standard design for reliable EGT measurement.

• Provides Critical EGT Data: Essential for precise fuel mixture leaning and engine health diagnostics.

• Type K Thermocouple: Utilizes industry-standard Chromel-Alumel thermocouple wires for accuracy across a wide temperature range.

• High-Temperature Alloy Sheath: Features a durable Inconel 600 or similar superalloy outer sheath for exceptional resistance to extreme temperatures and corrosive exhaust gases.

• Mineral Oxide (MgO) Insulation: High-purity Magnesium Oxide powder ensures electrical isolation and protects against vibration.

• Fast Response Time: Engineered to quickly detect EGT changes, crucial for accurate leaning and diagnostics.

• Complete Kit: Typically includes the EGT probe and necessary installation hardware (e.g., clamp or fitting, depending on kit specifics).

Technical Specifications

• Kit Part Number: M-111-1280 (Verify specific kit contents)

• Probe Part Number (Typical): 1080 (M-111 Style)

• Component Type: Exhaust Gas Temperature (EGT) Probe Kit

• OEM Manufacturer: J.P. Instruments (JPI)

• Sensor Type: Thermocouple, Type K (Chromel vs. Alumel).

• Sheath Material: High-Temperature Nickel-Based Alloy (e.g., Inconel 600).

• Insulation: Mineral Oxide (MgO).

• Temperature Range: Suitable for typical piston engine EGT range (e.g., 1000°F - 1650°F / 540°C - 900°C).

• Electrical Connection: Typically features screw terminals or ring terminals compatible with JPI harnesses.

• Mounting: Specific clamp or threaded fitting included in the kit (verify kit contents). Common style is adjustable hose clamp mounting.

• Certification: FAA-PMA Approved.

Aircraft Compatibility

This EGT Probe Kit is designed for installation on a wide range of aircraft equipped with J.P. Instruments engine monitoring systems (e.g., EDM series monitors) and utilizing engines with appropriate exhaust system ports for EGT probe installation. Compatibility spans across many general aviation aircraft manufacturers including Textron (Cessna, Beechcraft), Piper, Mooney, Cirrus, and others.

Crucial Note: Verification against the specific J.P. Instruments system installation manual and the aircraft/engine maintenance manual is mandatory to ensure correct part number applicability and installation eligibility.

Applications

• Measures exhaust gas temperature for display on a JPI multi-channel engine monitor.

• Primary sensor for fuel mixture leaning procedures (finding peak EGT, operating Lean of Peak or Rich of Peak).

• Engine diagnostics: Helps identify issues like fouled spark plugs, malfunctioning fuel injectors, or induction leaks by comparing EGT readings across cylinders.

Why Choose JPI M-111-1280?

Choosing the J.P. Instruments M-111-1280 kit ensures you are installing a high-quality, FAA-PMA certified probe specifically designed and calibrated for optimal performance with JPI engine monitors. Accurate EGT readings are fundamental to modern engine management techniques that enhance efficiency and protect against engine damage. JPI probes are renowned for their fast response time and durability. Using non-certified or incompatible probes can lead to inaccurate readings, slow response, or premature failure, potentially resulting in improper engine operation or masking critical engine health issues.

The M-111 style EGT probe operates based on the Seebeck effect. It consists of two dissimilar conductors (Type K: Chromel and Alumel) joined at the measuring junction inside the probe tip. When heated by exhaust gas, a temperature difference ($\Delta T$) exists between this junction and the reference junction (typically compensated within the JPI instrument). This $\Delta T$ generates a small voltage (EMF), approximately 41 microvolts per degree Celsius for Type K. JPI instruments utilize sophisticated analog-to-digital converters (ADCs) and linearization algorithms to precisely measure this millivoltage, apply reference junction compensation, and display an accurate temperature. The probe's response time is critical; JPI probes are designed with low thermal mass at the junction and highly conductive MgO insulation to rapidly transmit temperature changes, allowing pilots to precisely identify the moment of peak EGT during leaning.

Note: This is a flight-critical engine monitoring component. Its accuracy is crucial for safe and efficient engine operation. Probes must be installed in the correct location (typically 2-6 inches from the cylinder exhaust flange, consistent across cylinders) and secured properly using the provided hardware. Electrical connections must be clean, secure, and made using appropriate thermocouple extension wire if needed (observing polarity). Consult the JPI installation manual and the aircraft/engine maintenance manual for specific procedures.

Documentation

• J.P. Instruments Installation Manuals (General Resource) (Search for specific EDM model manual for probe installation details).

• Definitive part number applicability must be confirmed via JPI documentation and the aircraft's maintenance records/IPC.