WPD1 Dosing Unit Spear

 A range of low level spears in either a battery or cabled version.

The battery version incorperates a changable normally open or closed volt free contact, a buzzer and small flashing light that goes off when the chemical container is empty.

The cabled version incorperates a changable normally open or closed volt free contact with a 5 meter flying lead that can be wired into the WPD1 or a suitable control panel to operate a light or buzzer (not supplied)  when the chemical container is empty.