Micro-calorimeterRISE has two types of micro-calorimeters: TAM Air and TAM III. They permit measurement of heat production or heat absorption in materials at a given constant temperature. Parameters such as oxygen concentration and moisture concentration can also be varied while testing.
With the micro calorimeters we can measure parameters such as:
• Heat/energy production from materials at different temperatures
• Comparison of reactivity/heat between materials
Based on measurements in the micro calorimeters (and additional measurement methods) we can offer services such as:
• Investigation of the potential for self-heating or spontaneous combustion
• Risk analysis of storage of biofuels and other organic materials
• Calculation of kinetic parameters, for example activation energy
• Provide suggestions for safe storage
• Provide suggestions on prevention actions and firefighting tactics
The 8 channel TAM Air 3116 2 isothermal calorimeter
TAM Air is an isothermal calorimeter, usually referred to as a micro-calorimeter. It is relatively common in the industry, and has been developed for research into, and quality assurance of, the curing of concrete and cement. However, its application area is considerably wider than this, and it can be used to measure heat release from other types of material. RISE’s calorimeter can, for example, measure the oxidation and self-heating of different materials. The kinetic activation energy and reaction energy can be then determined.
The micro-calorimeter has eight channels, and can perform tests over the temperature range of 5-90 °C. Testing involves placing a small quantity of test material (up to a few grams) into a 20 ml ampoule which is closed and then lowered into one of the instrument’s eight channels. Each channel also has a reference channel. The ampoule is in contact with a heat flow sensor, which also senses the pre set temperature in the instrument. Production of heat in the ampoule as a result of oxidation, biological activity or other exothermic process creates a temperature gradient across the sensor, generating a voltage that is directly proportional to the thermal process occurring inside the ampoule. The method produces time resolved results, which means that it is possible, for example, to plot heat release as a function of time. The calorimeter has a very high accuracy, and can measure heat flows down to µW.
4 channel TAM III calorimeter
The TAM III micro-calorimeter is a further development of the TAM Air, containing four independent calorimeters that can be used together over the temperature range 15-150 °C. RISE’s instrument contains two multi calorimeters, each of which consists of three 20 ml mini calorimeters. These calorimeters operate in exactly the same way as for the TAM Air, with the difference that they incorporate integral references.
The third calorimeter is a micro-calorimeter with associated relative humidity perfusion. This equipment permits considerably more parameters to be varied while testing materials: oxygen concentration and moisture content within an ampoule can, for example, be exactly controlled during the test. This is very important when measuring how reactive pellets are.
The forth calorimeter is a 125 ml macro calorimeter that allows testing of larger samples or samples with heterogene composition.