• MPXI-F with coiled proprietary PVDF Stem and Floats
  • An MPXI-F flexible cable uncoils into a tank filled with oil. The MPXI-F is then screwed into the tank.
  • An MPXI-F float rises with oil levels. When the oil level exceeds the high level float, the words "High Level Alarm" show on the screen.
  • An MPXI-F unwinds as it is installed into a tank
  • An MPXI-F unwinds as it is installed into a tank

Explosion Proof Flexible SS and PVDF Stem Magnetostrictive Level Sensors


Explosion Proof Installation For Your Tallest Tanks

The Explosion-Proof MPXI-F features a flexible proprietary-PVDF or 316L SS braided-tubing stem for easy installation in tall tanks.

Product Description

The MPXI-F Explosion Proof Flexible SS and PVDF Stem Magnetostrictive Level Sensor is easy to install, every time. World-wide, explosion-proof/flame-proof installation? Easy. Flexible stem for crane-less installation in tanks up to 50 feet tall? Easy. Optional temperature sensors and high-level switch for extra protection? Easy.

Multiple Output Choices

Because the MPXI-F carries explosion-proof installation certifications, you can run Modbus network lines right up to each sensor without worrying about IS barriers. Or choose loop-powered 4-20 mA sensors for easy 2- or 4-wire hook up.

Tank Cloud Compatible

The MPXI-F liquid level sensor is a Tank Cloud client sensor, able to communicate via the Internet with the addition of an LOE server sensor (Modbus output only) or an RST-5003 module (Modbus or 4-20 mA output).

Quick Start-up

With its low-power-consumption design, and a start-up time of under five seconds, the MPXI-F level sensor makes battery power for remote installations easy.


The MPXI-F is designed for easy installation. The both the proprietary-PVDF stem and the 316 SS flexible tubing stem coil for compact shipping and on-site transportation. And with the stem weight attached, they uncoil easily into your tank, so you no longer need a flat bed truck and an 60-foot crane to install a 30-foot probe in a 30-foot tank.


The PVDF MPXI-F level sensor has an optional high-level switch (located 23.5" below probe zero reference) that is wired to independent of sensor operation. So even in the event of probe failure, you'll still get the high level alert. And both stem types allow for up to seven temperature sensors evenly spaced along the stem, providing real-time temperature output from inside your tanks.

Common Applications

  • C I, D 1 Hazardous Locations
  • C I, Z 0/1 Hazardous Locations
  • Tall Storage Tanks
  • Oil/Water Interface Measurement
  • Thick, Viscous, Sludgy Fluids
  • Industrial Effluent
  • Pulp and Paper
  • Biotech
  • Oil and Gas
  • Petrochemical
  • Chemical




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


4-20 mA: 14-bit DAC (1 mm)
Modbus: ±0.04 in. (±1mm)


Digital Temp Sensor: ±1°C
API 18.2 Temp Sensor: ±0.25°C over -40° to 85°C
±0.13°C over +20° to 70°C


Supply Voltage

4-20 mA: 24 VDC
Modbus: 12-24 VDC

Current Draw

4-20 mA, single float: 22 mA max
4-20 mA, dual float: 44 mA max
Modbus, single or dual: 15 mA typ.


Reverse polarity
CE compliant to EN 61326



Single or dual loop-powered 4-20 mA
Modbus RTU (RS-485), optional temperature sensors

Internet Connectivity

Tank Cloud LOE Master (Modbus only)
RST-5003 (4-20 mA or Modbus)



Optional RST-6001 USB to RS-485 converter
MND Modbus controller

4-20 mA

Factory set
Optional RST-4100 programming module



Cast aluminum, epoxy coated


5/8” ø Flexible Tubing, proprietary PVDF formulation
7/8” ø Flexible Tubing with Braid, 316L SS

Stem Length

PVDF: 10 - 50 ft. (3.05 - 15.2 m)
SS: 4 - 32 ft. (1.22 - 9.75 m)


Operating Temperature

-40° to 185° F (-40° to 85° C)

Protection Rating




Certificate: CSA19CA70219727
Rated 12-24 VDC, Um 250 V, 4-20 mA, or 80 mA
Class I Division 1, Groups C D T4; IP66
Class I, Zone 0/1
AEx ia/db IIB T4 Ga/Gb
Ex ia/db IIB T4 Ga/Gb, IP66
Ta = -40° to 85°C


Certificate: Sira 18ATEX2072X
II 1/2G Ex ia/db IIB T4 Ga/Gb
Ta = -40° to 85°C


Certificate: IECEx SIR 19.0026X
Ex ia/db IIB T4 Ga/Gb
Ta = -40° to 85°C