1. The ChemiSens reaction calorimeter program originated from the Ph.D. studies of its founders Christer Silvegren and Holger Nilsson. During studies in the mid seventies they found that reaction calorimetry was a very efficient and convenient technique to study polymerization reactions. Work with polymerisation kinetics soon made it clear that reaction calorimetry could be very powerful but it also made it clear that it was very difficult to design a true reaction calorimeter that worked unconditionally. Several types of reaction calorimeters were built and tested. The traditional heat flow principle was tested and soon abandoned due to the now well known problems with reproducibility and calibration.

The work to develop a true reaction calorimeter continued. The in-house mechanical and electronic workshops were invaluable. One of the intermediate prototypes on the way to a true calorimeter was published:
A Calorimetri Investigation of Suspension and Emulsion Polymerization of Vinyl Chloride
H. Nilsson, C. Silvegren, B. Törnell, Ang. Macromol. Chem. 112(1983) 125-142 .

2 & 3. The first True Heat Flow Reaction Clorimeter was built in 1983 and was designed for polymerisation studies. The further work was directed to the design of a general purpose reaction calorimeter and was sponsored by the Swedish Board for Technical Development, Astra Pharmaceuticals, Nobel Industries and Nobel Chemicals. The measuring system was improved and the prototype of a general purpose reaction calorimeter was built in 1985. ChemiSens was founded the same year and based its commercial instrument from that prototype.

4. The first delivery to Akzo Holland.

5. The 1985 instrument had the powerful refrigerating system built in. Later in 1995 when the new CPA200 was introduced the necessary refrigerating system became an add-on device, chosen for each specific need.