• MPX-R Magnetostricive Float Level Transmitter
  • Oil floats on top of water in a tank. An MPX-R is installed in the tank, with a water-level float and oil-level float floating on water and oil. They rise and fall with the water and oil.
  • Tank with MPX-R sits by an oil well.
  • MPX-E Explosion Proof Magnetostrictive Float Level Transmitter
  • MPX-E Explosion Proof Magnetostrictive Float Level Transmitter
  • MPX-R Explosion Proof Magnetostrictive Float Level Transmitter

Explosion Proof Magnetostrictive Float Level Transmitter


Extreme Accuracy For Extreme Environments

The MPX-E’s light weight design makes it ideal for applications where space is limited, while the MPX-R’ s large, robust floats and stem make it ideal for harsh applications where fouling or build up might be a concern.


The MPX magnetostrictive liquid level probe is very accurate and tough as nails. It's also an ideal solution for taking two measurements: both the interface level measurement and a total volume.

Modbus Output
The RS-485 Modbus RTU output makes the MPX compatible with any Modbus controller or PLC. It also simplifies wiring dramatically.

Tank Cloud Compatible
The MPX liquid level sensor is a Tank Cloud slave sensor, able to communicate via the Internet with the addition of an LOE Master sensor or an RST-5003 module.

Durable & Compatible
This liquid level sensor is built to take a beating - designed for high turbidity environments in hazardous locations. It also has several materials options for the stem and floats for maximum chemical compatibility.

Common Applications
  • C I, D 1 Hazardous Locations
  • Storage Tanks (All Sizes)
  • Fuel Tanks
  • Oil/Water Interface Measurement
  • Thick, Viscous, Sludgy Fluids
  • Industrial Effluent
  • Power Generation
  • Water and Wastewater Treatment
  • Pulp and Paper
  • Biotech
  • Oil and Gas
  • Petrochemical
  • Chemical
Datasheets & Downloads


Greater of ±0.04 in. (±1mm) or 0.05% of full range
Modbus: ±0.04 in. (±1mm)
4-20 mA: 14 bit DAC


Supply Voltage
12-24 VDC
Maximum Current Draw
Modbus MPX-E: 25 mA
Modbus MPX-R: 28 mA
4-20 mA Single: 22 mA
4-20 mA Dual: 44 mA


Class I Division 1 Groups C & D T4 (Ta 85°C)
Class I Division 2 Groups C & D T4 (Ta 85°C)
Class I, Zone 1; AEx d IIB T4
Class I, Zone 2; AEx nA IIB T4
Ex d IIB T4
Ex nA IIB T4


4-20mA (Loop-Powered 2 wire)
Dual 4-20mA (Loop-Powered 3 wire)
Modbus RTU (RS-485) with Temperature output (optional for MPX-E)
Internet Connectivity
Tank Cloud LOE Master


Optional RST-6001 USB to RS-485 converter
4-20 mA
Factory set or optional RST-4100 programming module


Cast aluminium, epoxy coated
304 SS or 316L SS
Stem Length
MPX-E: 1 - 12.75 ft. (0.3 - 3.9 m)
MPX-R: 4 - 31.5 ft. (1.22 - 9.60 m)


Operating Temperature
-40° to 185° F (-40° to 85° C)
Protection Rating