EGT Digital PMD1XT Pyrometer Gauge + Probe Kit - Diesel Race Series DF

This kit pairs the PMD1XT digital pyrometer gauge with the EGT-DF enclosed-tip diesel EGT probe — a combination designed specifically for diesel and biodiesel exhaust monitoring where probe fouling and chemical corrosion are real operating concerns.

The enclosed-tip design protects the thermocouple junction from sulfur compounds, soot, and deposits that can degrade exposed-junction probes over time. Both components are made in the USA.

Why Diesel Exhaust Requires a Different Probe

Diesel exhaust presents a more chemically aggressive environment than gasoline exhaust.

Sulfur compounds and condensates can form during low-temperature operation. Over time, these can degrade exposed thermocouple junctions, leading to drift or failure.

The EGT-DF probe uses an enclosed junction design that significantly reduces this failure mode by isolating the sensing junction inside the Inconel sheath.

EGT-DF Probe Construction

Enclosed Junction

The thermocouple junction is sealed inside the Inconel 600 sheath and surrounded by MgO insulation.

This design:

• Protects the junction from direct exposure 
• Improves durability in diesel environments 
• Trades response speed for longevity 

Response time:

• 550 ms (time constant) 

Response time is defined as the time required to reach 63.2% of a step temperature change.

Probe Geometry

• Diameter: 1/8" nominal (0.125") 
• Max insertion depth: 1.35" 
• Adjustable compression fitting allows positioning 

Proper insertion ensures the probe tip is in the exhaust gas stream without contacting internal surfaces.

Materials

• Sheath: Inconel 600 
• Insulation: MgO 
• Compression fitting: 316 stainless steel 
• Cable: Stainless overbraid with FEP insulation, 20 AWG 

Choosing the Right EGT Probe

For diesel applications, the enclosed-tip EGT-DF is the appropriate choice due to durability and resistance to fouling.

PMD1XT Gauge

The PMD1XT is a digital panel meter designed for thermocouple measurement.

• 4-digit LED display 
• 1°F / 1°C resolution 
• 0.5 second update rate 
• ±0.2% of reading accuracy 

The gauge supports multiple input types depending on configuration, and ships configured for Type K thermocouple use in this kit.

Alarm Relay

• 1A @ 30 VDC 
• Programmable setpoint 
• Non-volatile memory 

Used for:

• Audible alarms 
• Warning lights 
• Control circuits 

Peak Hold

Stores the highest recorded temperature for later review.

Optional Analog Output

Optional 0–5 VDC output provides a signal proportional to measured temperature for DAQ or ECU integration.

Wiring

Type K polarity must be observed:

• Yellow = Positive (+) 
• Red = Negative (–) 

Incorrect polarity results in inverted readings.

Installation Overview

Probe Location

• Pre-turbo: most accurate for engine protection 
• Post-turbo: lower readings, slower response 

Applications

• Diesel performance and racing 
• Marine diesel engines 
• Heavy-duty trucking 
• Industrial diesel equipment 

Summary

The PMD1XT + EGT-DF kit provides a durable, accurate solution for diesel exhaust temperature monitoring.

• Enclosed junction for long life 
• Accurate and stable readings 
• Integrated alarm and peak hold 
• Optional analog output for data systems