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Home » All Blogs » EGT Probe

All Blogs EGT Probe

Please explain the difference between Type K & Type J thermocouple CHT (Cylinder Head Temperature) sending units?

The primary differences between the two thermocouples are:

Measuring Range...
Type K = -330°F to +2460°F (-200°C to +1250°C)
Type J = -40°F to +1382°F (-40°C to +750°C)

Sensitivity...
Type K = approximately 41 µV/°C
Type J = approximately 55 µV/°C

If you already own a gauge it is important that you use the correct thermocouple sensor type, otherwise the result will be incorrect CHT temperature readings due to mismatched sensitivities.

Type J & Type K Thermocouple US ANSI Color Codes
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What are the differences between a thermocouple and an RTD?

The most notable difference between a thermocouple and an RTD (Resistance Temperature Detector) is the principle of operation. A thermocouple operates on the principle that two dissimilar metals joined together will produce a voltage related to a temperature difference. An RTD, operates on the principle that electrical resistance of certain metals changes in a predictable way depending on the rise or fall in temperature.

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How do I know if my EGT Sensor Probe is reading correctly?

The easiest way to check an EGT probe out at 2 temperature points is:

  • 's blog
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At what depth should I install the EGT probe?

Typically it is the center of the exhaust stream. This is not necessarily the center of the runner through the exhaust manifold or the header tube. The exhaust stream is dictated by flow rate, bend radius, the angle of the valve in relationship to the exhaust port, port configurations and other factors.

  • 's blog
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Why is the new EGT probe temperature reading lower than my old one?

A customer recently purchased a new 3/16" Diesel & Bio-Fuel EGT probe from us, and after installing, found it was reading about 200F lower than their old probe.  After some emails back and forth we learned that the probe they replaced was also an enclosed tip probe but was smaller in diameter and about 50% shorter than the new probe.

  • neillm's blog
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Not inserting the EGT Probe tip completely into the center of the exhaust stream can result in low EGT temperature readings.

Not inserting the EGT Probe tip completely into the center of the exhaust stream can result in low EGT temperature readings.

After installing our Marine Series EGT Digital Pyrometer Kit on their boat a customer called to ask why their EGT temperature readings were hundreds of degrees below expected. They were reading 157 °F@ idle, 184 °F @ 1000 rpm, and 213 °F @ 1500 rpm.

Not inserting the EGT Probe tip completely into the center of the exhaust stream
  • neillm's blog
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Explain 1/8" NPT Male Thread

A common question from our customers is how a 3/16" or 1/4" OD temperature probe can be used with an 1/8" NPT thread male compression fitting . Isn't a temperature probe with 3/16" or 1/4" OD too large for a compression fitting with 1/8" NPT male thread?

  • neillm's blog
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EGT Probe Comparison Chart

Recommended for fuel types: Gasoline, Natural gas, Nitrous oxide, & Alcohols

  • neillm's blog
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I want to drill & tap a hole in the manifold & thread in the Compression Fitting. What tools will I need?

We recently created an NPT Compression Fitting Technical Guide.

The guide includes detailed information about the compression fitting dimensions, threads, ratings, assembly, and installation.

You can download it from here:

  • neillm's blog
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EGT Probes Used in Marine Diesel Applications

Marine Engines are critical components to maritime vessel operations either for propulsion, power generation or auxiliary machinery operation. Typically these systems employ diesel engine management systems that rely on sensor inputs to manage operating performance for efficiency and shutdown to prevent catastrophic engine failures.

  • 's blog
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I was wondering if you could guide me to where I may find some charts referencing EGT's.

Q: I was wondering if you could guide me to where I may find some charts referencing EGT's.

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I have a Mercedes turbo diesel and want to monitor the exhaust temperature and the temperature of the intake air

I have a Mercedes turbo diesel and my idea is to monitor both the exhaust temperature and the temperature of the incoming air in the intake manifold. Is there enough range on your EGT probe to measure also lower temperatures (min. about -10 Celsius)?

  • 's blog
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What is the accuracy of the EGT probe?

There are many factors to the "accuracy" any sensor. The most important aspect is what accuracy is needed to satisfy the actual requirement and the evaluation process to get there. Typically if your EGT sensor is within 1%  to 5% of the actual temperature will satisfy most requirements. The major factors are probe accuracy and the indicator accuracy, taking these both in account will give you a close estimate of the actual temperature you are reading from the indicator(s).

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Be sure to properly tie down the EGT probe cable to avoid wire fatigue at cable to sheath junction

Be sure to properly tie down the EGT probe cable to avoid wire fatigue at cable to sheath junction

Proper Tie Down of EGT Probe Cable
  • neillm's blog
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Which Diameter EGT probe do I need?

Q: I am looking for several EGT sensors for tuning a normally aspirated 2.3 L gasoline engine with 1 5/8” exhaust tubing. Are there any available guidelines about what size EGT probe is recommended, 1/8”, 3/16” or 1/4”?

A: We find that, for most applications, the 3/16” EGT probe is suitable.  It’s our most popular probe, with nearly 75% of the probes we sell being this diameter. 

  • neillm's blog
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If I place only one EGT probe in the collector will I get an average temperature across all of the cylinders?

One EGT probe placed in the collector will measure the leanest (hottest) running cylinder. For a quick test of which one that is you can do the following:

  • 's blog
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How can I identify if my CHT sensor is a Type K or Type J thermocouple?

The easist way to identify your CHT sensor thermocouple type (or most any thermocouple for that matter) is to look at the colors of the wire jacket insulation.

Type K
Yellow (+ leg)
Red (- leg)

Type J
White (+ leg)
Red (- leg)

But in some cases, the wire jacket insulation has been stripped away or is frayed & the colors are not obvious.
In this instance, you can use a magnet to help determine the thermocouple type.

  • neillm's blog
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What does "Analog Output" mean?

Q:  I want to buy the SuperLite Digital Pyrometer.  You sell one with Analog Output.  What does "Analog Output" mean?

 A:  The meter with the “Analog Output” option has a linear 0 to 5 VDC retransmitting output.  This 0 to 5 VDC output voltage changes in proportion to the temperature reading on the digital display.

Customers who choose the meter with the Analog Output option typically are connecting this output to another device, such as a data logger or data recorder.

  • neillm's blog
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How Can I Tell If My EGT Probe is Grounded or Ungrounded?

In a grounded EGT probe the wires are connected internally to the outer sheath of the probe.  In an ungrounded EGT probe the wires are isolated from the outer sheath.

Checking EGT Probe Continuity
  • neillm's blog
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Will Your EGT Probe Work with My Vehicle?

Customer Question of The Day:  

I am hoping you can help I have a audi rs4 b5 2001 model it keeps coming up with a fault code with the egt sensor 2 short to ground will you be able to supply an egt sensor for my vehicle and if you can what would the cost be?

Response:

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