• APG MPI-F Intrinsically Safe, Flexible Stem Magnetostrictive Float Level Transmitter
  • A flexible stainless steel MPI sits installed in an oil tank. As oil levels rise and fall the float rises and falls with it.
  • APG MPI-F unwinds as it is installed in a tank

Intrinsically Safe Flexible Magnetostrictive Float Level Transmitter


Intrinsic Safety Meets Easy Installation

The MPI-F features a 316L SS flexible tubing braided stem that uncoils easily for simple installation in tall tanks.


The MPI-F does everything you expect from an MPI, but with more flexibility. Its 316L SS flexible tubing with braided stem simplifies installation in tall tanks without compromising its Class I, Div 1 Intrinsically Safe rating.

Modbus Output
The RS-485 Modbus RTU output makes the MPI compatible with any Modbus controller or PLC. The MPI can also be paired with an MDI to create a self-contained, Intrinsically Safe level measurement system.

Tank Cloud Compatible
The MPI 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.

The MPI-F is designed with ease of use in mind. The 316 SS flexible tubing stem coils for compact shipping, and with the stem weight attached, uncoils easily into your tank, so you no longer need an 40-foot crane to install a 20-foot probe in a 20-foot tank.

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


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


Supply Voltage
8-24 VDC
Typical Current Draw
Modbus: 25 mA
Reverse polarity
EMI/Surge (IEC 61000-4-5, 4-6, 4-7)


Certificate: CSA19CA70219727
Ambient: -40° to 85°C
Class I Division 1, Groups C D T4
Class I, Zone 0; AEx ia IIB T4 Ga
Ex ia IIB T4 Ga
Certificate: Sira 18ATEX2072X
II 1G Ex ia IIB T4 Ga
Ta = -40° to 85°C
Certificate: IECEx SIR 19.0026X
Ex ia IIB T4 Ga
Ta = -40° to 85°C


Modbus RTU (RS-485) with Surge Protection
Internet Connectivity
Tank Cloud LOE Master


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


Cast aluminum, epoxy coated
7/8” ø Flexible Tubing with Braid, 316L SS
Stem Length
4 - 25 ft. (1.22 - 7.62 m)


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