The 3 types of floats used for activating a pump are: tethered float switch, vertical switch, and micro-reed switch.
How it works:
- Magnetic reed contacts are located inside a sealed shaft
- A small float with magnets built inside moves up as water rises
- The magnet on the float closes the reed contact in the shaft and activates the pump
Characteristics of a dual micro-reed switch:
- The float is not attached to the pump, so it adjusts easily to any activation level
- Uses a hose clamp to secure it to the discharge pipe
- Extremely reliable
- Second switch is for added security
- Some are caged in order to protect the floats
- The Basement Watchdog Dual Float is included with all backup pumps
- The Universal Dual Float (BWC1) is a caged switch and included on the BW, BWT, and the BWSS Series pumps
* The Dual Float is not intended for sewage applications
How it works:
- A float is mounted around a vertical rod and floats on the water
- As the water level rises so does the float
- When the float reaches ‘the top’, two contacts are closed in the switch and the pump is activated
Characteristics of a vertical switch:
- Switch can be used in sump or sewage applications
- ‘On’ point is easily adjusted
- This float has specific movement up and down
How it works:
- The float hangs from the pump via a cord and floats on the water
- As water rises, so does the float
- At a certain angle, a ball inside the float drops into place and the pump is activated
Characteristics of a tethered switch:
- Switch can be used in sump or sewage applications
- ‘On’ and ‘off' points are easily adjusted
- Needs to be installed where it does not get stuck against the pit wall or other items in the pit
- Needs space for movement