MLS-4EX Multi-Point Float Level Switches

The model MLS-4EX series level switches are a simple and reliable way to sense fluid levels. Magnetic floats actuate a reed switch at each switching point. In the explosion proof housing are terminal blocks to provide simple field wiring. Switches can be ordered Normally Open, Normally Closed, SPDT or DPDT.

The switch points are fixed on the probe for reliable and repeatable operation. The overall probe length is adjustable by way of a stainless steel compression fitting giving the user some flexibility in installation.

Because each unit is custom fabricated for your application, options include flanged process connections, low specific gravity floats, high pressure floats, stilling wells, other materials of construction, and signal conditioners or control panels.

Product Features:

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


  • Level alarms
  • Pump control
  • Automatic filling or emptying


  • Water
  • Chemicals
  • Fuels



Maximum Voltage: 100VDC (120VAC) Current: 0.5A switching; 1.2A carry Contacts: Choose from SPST (NO), SPST (NC) or SPDT (C, NO, NC), DPDT (C,NO,NC,C,NO,NC)


Process Entry: 2”NPT standard 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: 0.61 standard; as low as 0.4 optional (Interface detecting floats available) Approval: CSA approved

Ordering Information

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 4C 2"NPT 0.9 150F 85 24" 10" 22" NO X
Contact type:

NO = All Normally Open (in dry condition)
NC = All Normally Closed

Wetted parts - material of construction

4C = 304SS with carbon steel connection
4= 304SS including process connection
6 = 316SS including process connection
X = Other (specify)


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


MLS-4EX Level Switch

multi point float level switchmulti point float level switch