Up to now, all published studies using terahertz spectroscopy to study crystallisation from solution have relied on solvent evaporation to trigger nucleation. These studies were performed by ATR sampling, which restricts the observations to the evanescent field near the surface of the ATR crystal rather than in the bulk of the liquid. The goal of this project was hence to build a versatile setup that would be capable to study crystallisation mechanisms from supersaturated solutions with THz-TDS in transmission geometry. Main design criteria were intended to cover operation over a wide of temperature and concentration, assure stability at high temperature, and control temperature gradients during crystallisation, as well as being able to measure under stagnant and flowing conditions.