Detector Technology Limited supply various types of industrial and domestic ionization chamber of advanced design containing a single radioisotope source. Our design process utilises our in house computer model developed to optimize performance characteristics. The units are supplied assembled ready to mount on a suitable printed circuit board using the pre-tinned tags provided. No source adjustment is required. The DSCA3 incorporates a performances test electrode to permit electrical testing of the chamber during operation. When actuated the electrode disturbs the balance conditions to simulate the presence of smoke.