MLS-4EX Multi-Point Float Level Switch

The MLS-4EX series multi-float level switch is a simple and reliable way to sense fluid levels. This multi-point unit provides a low cost method of monitoring multiple liquid level points inside of a tank or sump. MLS-4EX units are custom length and can be configured with “up to four” independent switch activation levels.


The unit is constructed with a stainless steel probe that has magnetic floats which actuate a reed switch at each switch point. The switch points are fixed on the probe for reliable and repeatable operation. These features make the MLS-4EX multi-point level switch ideal for alarms and pump controls in a variety of remote applications. Because each unit is custom fabricated, options include flange connections, low specific gravity floats, high pressure floats and stilling wells.

The MLS-4EX multi-float switch is a product name, however these units can also be referred to as a well float switch, stainless steel float switch, waste tank float switch, pump float switch, level switch float, float level switch and well float switch.

MLS-4EX Level Switch

multi point float level switch

multi point float level switch

Babbitt also offers Audible & Visual Alarm Boxes that can be used to accompany any of our single point, dual point or multi-point level switches. Alarm boxes provide simple and reliable warning of high or low-level alarm conditions in tanks, vessels, silos, hoppers, sumps, chutes and interface applications. To learn more, click the link here.


  • Up to 4 switch points on a single probe
  • Stainless steel wetted parts
  • Rugged construction
  • Explosion proof design
  • Lengths up to 12 feet
  • Cost effective


  • Level alarms
  • Pump control
  • Automatic filling or emptying


  • Water
  • Chemicals
  • Fuels



Maximum Voltage: 200VDC
Current: Switching 2.0A; Carry 0.2A
Contacts: SPDT or DPDT (Limit 2 Floats)


Process Entry: 2”NPT standard; flange connections optional
Conduit Entry: ½”NPT
Probe: ½” Heavy wall SS tubing
Housing: Cast aluminum, explosion proof Class I, Groups C & D; Class II, Groups E, F & G


Pressure: 225 PSI standard; up to 1000 PSI optional
Maximum Temp: 250 F
Min. Specific Gravity: 0.72 standard; as low as 0.50 optional (Interface detecting floats available)
Approval: CSA approved

Specifications subject to change without notice.


Please fill out and submit a MLS-4EX Data Worksheet for quotation.

MLS-4EXNumber of floats
Wetted parts - material of constructionProcess Connection:
2” NPT standard
Other (specify)
Min. Specific GravityMax. TemperaturePressure (PSI)L – DimensionA – DimensionB – DimensionContact typeOptions:Please describe
  B 6 2"NPT 0.9 150F 85 24" 10" 22" SPDT X

Contact type:

DPDT (Max 2 Floats)

Wetted parts - material of construction

X = Other (specify)


Stilling well – for over 12 feet long or turbulent applications
Control panels