The FS4 level indicator allows a direct reading above a tank and direct control of pumps or valves, alarm signals, with the use of level switches fitted on the indicator tube. FS4 is designed for small tanks or drums, barrels, as well as underground tanks. 

A float at the bottom of a stem moves an indicator inside a transparent PVC tube for a direct reading. Standard model has a guided float inside a 63 mm OD tube; mounting on the tank with a loose flange ND 65. For drums, there is no guiding tube and fitting is a thread connection. Each FS4 is designed according to the fluid specific weight and the monitored height. Higher is the specific weight, bigger is the float: with a fixed diameter, the float height is therefore longer. The float is immersed at 80% before beginning to float; this defines the indication dead zone of low levels. The indicator has a built in magnet able to actuate our switches outside the tube (BSM 501 and BRK, please see the documentation 585-..).

The following process parameters must be specified with the order
Liquid:       . . . . . . . . . . . . . . . . . .
Pressure:       . . . . . . . . . . . . . . . . . .
Temperature:       . . . . . . . . . . . . . . . . . .
Tank material and height:      . . . . . . . . . . . . . . . . . .
Options have to be clearly specified        . . . . . . . . . . . . . . . . . . .