Select-640 SSD (Single Shot Doser)

The Select-640 SSD, including the VariSpeed version, dispenses a specific amount of product when activated with a single impulse.

The impulse can come from a computer generated source, or from (more normally) a single push of a foot switch.

With the VariSpeed version, on-screen controls let you specify the speed of pumping (see video).

One other major use for the Select-640 SSD is for situations where a large water meter is used on horticultural sites. The large meters often send out one pulse per 100 litres (K=100), and the Select-640 SSD is the best option for dealing with this.