The D30 two position top entry level switch operates on the principle of displacement.
When non-floating solid polypropylene displacers, suspended from the switch, are immersed in liquid, their weight is reduced by an amount equal to the weight of the liquid they displace. This weight change is detected and used to actuate a magnetically isolated switch.
Surface agitation, froth, floating or submerged solids do not effect the action of the D30 switch. The displacement principle depends on the specific gravity of the liquid in which the displacers are suspended. The switch is set to operate in water, at a specific gravity of 1+/- 5%.
Various displacers are also available to allow the switch to operate in liquids of other specific gravities.
The D30 level switch is designed to detect a level change in liquids that have a specific gravity of one, that is, water or water that contains dissolved or suspended solids. The switch can be mounted in any location above the liquid being sensed.
The twist lock displacers are positioned on the cord at points where the switch is required to change state, for example close to the bottom of a tank for the low level switching point and close to the top of a tank for the high level switching point.
A falling liquid level will trip the switch when the bottom displacers are partly uncovered, and a rising liquid will reset the switch when the top displacers are partly submerged.
A 20 Amp single pole double throw switch is provided so circuits can be switched on or off when liquid is either rising or falling, making the switch ideal for both pump in and pump out applications. The switch mechanism built into the D30 is a special high current high capacity device, capable of directly controlling pump motors up to 2hp at 240 VAC.
For less demanding applications, the switch is equally capable of actuating relays, contactors or PLC’s.
Enquiry Form
Have a question about a product or want to request a price?
Just fill in this form. Please include your postcode if you require delivery.