Temperature Measurement by Exhaust Thermocouple in Engines

Exhaust Thermocouple Sensors are a key element of modern engine management. Measuring the temperature of exhaust gas can provide an important input into system algorithms to improve efficiency, reduce pollutants and extend engine life.

Exhaust Gas sensors are usually thermocouples due to the very high temperatures involved. Often 800°C or more can be achieved. Thermocouple type K is the most common although type J is also found in lower performance engines.

Exhaust Thermocouple Design

The Primary requirement of an Exhaust Thermocouple is to be robust enough to survive a high vibration environment. After that it must be small enough to respond quickly and not disrupt gas flows.… Read more

High Voltage Temperature Sensor Design

Temperature sensors regularly go into some very unpleasant environments. Usually this involves chemicals, pressure, temperature extremes or high vibration. Recently we had an enquiry for Resistance Thermometers (Pt 100) to go into high voltage transformers. The probe specification included a test at 3600V AC for 1 minute. Peak Sensors had very little experience of a high voltage temperature sensor.

The best designs come from collaborative efforts. Peak Sensors knew all the details about making and protecting the probe. The customer was familar with high voltages.

Insulation

The usual insulating polymers (PVC, PTFE, PFA Silicon Rubber) used with temperature sensors were not good enough insulators.… Read more

TC Temperature Sensors

TC is a common abbreviation for Thermocouple. A TC is made from two different wires joined in a loop. When the temperatures of the joins (Hot Junction and Cold Junction) are different a very small current flows. It the cold junction is split, and a voltmeter is placed there, it detects an EMF. When the dissimilar wire alloys are defined alloy pairs, the EMF can be used to determine the temperature difference, and thus the temperature of the hot junction.

Common TC Pairs

K Type is the most common. (NiCr v NiMgAlSi) This TC operates from -200 to + 1300°C.… Read more

Aerospace Heat Treatment Thermocouples to AMS 2750D

Aerospace Heat Treatment applications require AMS 2750D thermocouples. The key point of this standard, for sensor makers, demands that Thermocouples are calibrated by approved means and shown to be within defined limits. Individual sensors or batches of Thermocouple material can be tested. The maximum acceptable error depends on sensor use. There are strict limits on the number of uses before recalibration or replacement is required.

Peak Sensors often supplies Mineral Insulated Thermocouples, Rare Metal Thermocouples or Thermocouple wire batch certified. Thermocouple type R, type S and type N are the most common aerospace sensors.

Cost Reduction for AMS 2750D

To minimise Mineral Insulated Thermocouple sensor costs, Peak Sensors will have batches of wire calibrated and then from it, build sensors according to a customers requirement.… Read more

Original Equipment Temperature Sensors

Many equipment designers require temperature measurement inputs in Original Equipment they are creating. Demands for thermal control, overheat protection, temperature compensation, heater and cooler switching all require system signals.

Working with Original Equipment Designers.

Peak Sensor staff are never happier than when we are talking to a design engineer about a new application. Engineers know their product well. Peak Sensors staff know about sensors. Put the two together and great solutions can emerge.

Good sensor design identifies the balance between a number of conflicting parameters

Probe Cost
System cost
Robustness
Protection from ambient conditions
Speed of response
Process connection
Accuracy
Sensor lifetime
Subsequent assembly
Replacement

Peak Sensors has a long history of working with designers to create optimal solutions for original equipment.… Read more

The Temperature Sensor Specialists

Constantly improving temperature measurement.

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