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

European Resistance Thermometers are usually available as 100Ω at 0°C and 138.5Ω at 100°C according to BS EN 60751 with a linear resistance change within and beyond these temperatures. Resistance Thermometers can be set to 500 or 1000 Ω

Elements can be rated to -200°C and up to +600°C.

RTD’s can be more accurate than Thermocouples, however the expected accuracy of an assembly can easily be misunderstood.

Common Resistance Thermometer Element Types

The Pt 100 sensing element is available in a number of forms:

Thin Film elements are the volume leader inexpensive device.… Read more

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

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 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

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

Temperature sensors can be very accurate devices, however poor probe design or bad installation can easily give a system significant temperature reading errors. Conduction error is primarily caused by inadequate immersion. Heavy Industrial applications usually have good immersions, but designers of small pieces of equipment must address the problem.

Sensors usually need protection sheaths and always use signal cables. Both items will conduct heat away from a system. Probe leads and sheath will pass through a thermal gradient at some point. If the thermal gradient is close to the measuring point, then the sensor will be influenced to some degree by ambient conditions.… Read more

Direct to Digital Signals

Volume OEM Applications within the temperature range -55 to + 125 deg C now can use the Maxim High Precision 1-wire Digital thermometer. A digital signal directly from the sensor can give significant advantages over competing technologies.

No standard ready built instrumentation is available, however when volumes are sufficiently high, specialist instrument and software can be designed into equipment control systems.

1 Wire sensor attributes

The accuracy is only +/- 0.5 deg over the range -10 to + 85 deg. 9 bit (0.5 degC) resolution and conversions in 750 ms are adequate for many applications.… Read more