The Temperature Sensor Specialists

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Tag Archives: thermocouple

Waste Treatment Technology Temperature Sensor

Waste Treatment Technology is becoming a more important aspect in society for a number of reasons. Peak Sensors is involved with customers in a number of available technologies, and we are actively seeking new clients with novel waste technology developments to develop better temperature control sensors. If recycling options are exhausted or uneconomic, Turning waste into useful products has a number of advantages.

There are a number of proven and commercially viable waste treatment processes. The processes usually involves some degree of temperature control. Peak Sensors is currently collaborating with these waste treatment technology processes:

Gasification

Pyrolysis

Composting

Waste into Energy, High Temperature Thermocouples.… Read more

Ceramic used in High Temperature Sensor Designs

Temperature Sensors operating above 1100°C normally use ceramic protection sheaths and insulators. The most useful ceramics for temperature sensors are Recrystalised alumina and Aluminous Porcelain.

Recrystalised Alumina Ceramic

Recrystalised Alumina is commonly called RA, Alsint ®, RUBALIT ®  , AluSIK-99 ZA ®, 

RA is the higher temperature grade, with applications up to 1700°C. The specification most usually referred to is DIN 799. A similar grade DIN 710 is now no longer readily available, but it is still seen on older thermocouple specifications sheets. DIN 799 grade is minimum 99.7% Al2O3. Some ceramic shape manufacturers claim 99.8%. My understanding is that the basic raw material before extrusion is 99.8%.… Read more

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

POX Temperature Sensor for Chemical Plants

Peak Sensors supplies temperature sensors to many specialised applications. POX, Partial Oxidation is a chemical plant process which uses fuel / air mixture to partially oxidise the gases into other useful products. Carbon Monoxide is the common product. The POX temperature sensor requires some novel design detail to survive the plant and to be safe should failure occur.

POX Process

This process occurs at temperatures around 1200 deg C. It is a very aggressive environment for temperature sensors. Heat, Pressure, Oxygen and Combustion products are present. A number of Probes are typically situated almost within the insulation to give them some protection. As insulation deteriates over the plant life the probes get an even tougher life.… Read more

Compost Temperature Sensor Design

Commercial Composting demands good temperature measurement and control. Elevated temperatures are required for throughput management and legal compliance. Compost temperature sensors are required for process management.

Compost Process

Temperatures of around 65 deg C are needed to optimise micro organism activity, accelerate organic matter breakdown, destroy pathogens and eliminate weed seeds. Low temperatures will allow anaerobic rotting to occur.

Throughput, process control and material handling are improved by using in vessel composting systems. Temperature sensors are inserted at strategic positions.

Compost Temperature Sensor design

The sensors have unique design features for this application. The temperature sensors get a rough tough life. Nothing seems to be delicate when making compost so probes must be very robust.… Read more

Glass Furnace Temperature Sensors

Glass furnaces have significant temperature control issues. Glass furnace temperature can range from around 1100 °C to 1600 °C. Thermocouples need to be made of Precious metals to survive this.

Melter Furnace

During the initial melting of glass cullet, sufficient melt temperature is required to achieve the glass condition required for processing, however excess heating uses extra fuel, shortens plant life and can affect the glass batch properties in an undesirable way.

Melters have temperature sensors in Walls, Roof (Crown) and Bottom. Sensors are often tagged: Melter Bottom, Sump Bottom, Riser sidewall, Channel bottom, Crown, Melter Side wall and so on.… 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