What exactly is a ball float anyhow?

The ball float method is a direct reading liquid level mechanism.  The most practical design for the ball float is a hollow metal ball or sphere.  However, there are no restrictions to the size, shape or material used.  The operation of the ball float is simple; the ball floats sit on top of the liquid in a tank or well.  If the liquid level changes, the float will follow with the liquid level change.  The downside with using ball floats is they also can get tangled up or weighed down with grease or foam or when grease hardens the float may sit on top of the hardened grease thus creating a false reading.  You also have to take into account that there may be some costly maintenance involve with using a ball float system.

On the other hand, the probe or sometimes referred to as a “stick” is considered a primary level sensing device in any municipal or industrial application. It works by using the conductive properties of the water.

All you do is, hang the probe on its own cable into your wet well, using brackets we supply.  It has no electronics and no moving parts, which means there is nothing to that gets tangled, break or fail.  It’s mounted near the inflow (which we highly recommend doing), allowing the turbulence to keep it clean, so there is virtually very little maintenance required.  Even if a build-up does occur it has a squeegy you just pull it through “simple as pie,” it’s usually conductive and keeps right on working.  That’s why it has a 10 year warranty!

Request a trial today: http://www.multitrode.com/landing/reliable-liquid-level-sensor

Drawings of new pits come through my desk nearly every month and most have the MultiTrode Level Sensing Probe already specified, but from time to time I see a ball float right at the top to indicate high level and an alarm. The following figures show the backup level sensing configuration with a ball float and how that configuration matches with the backup Fail Safe Probe sensor design.
 

Proposed Tank Level With Ball Float

Proposed Tank Level With Fail Safe

It seems no one ever thought of changing the ball float to a new and more advanced Fail Safe Probe and install the Fail Safe Relay as well. Ball floats have their place; but when mission critical high level flow’s need a mission critical alarm, a Fail Safe Probe is the best bet together with a Fail Safe Relay.

Those who are familiar with the probe would know that the 200mm single sensor probe has just one wire, but the Fail Safe has two. The Fail Safe Controller will “integrate the loop” to check for continuity of the circuit; and if there is a break in the cable it will close a relay that will warn that, the integrity of the probe to do its job has been limited or has failed. Handy if you have a sewerage pumping station near a creek or river where people swim a lot.