• Explosion Proof Resistive Level Transmitter with 1" Stem
  • RPM with a large red float is installed in an oil tank. The red float rises and falls with the oil level.
  • RPM in tank with mucky liquid

Explosion Proof Resistive Level Transmitter with 1" Stem


As Durable As It Gets

The RPM is made to work for you and is completely customizable for your needs including: probe length, float type, specific gravity, and outputs.


This float level transmitter is the ultimate in durability. It's commonly referred to in the field as a mud probe, one of the most demanding applications around. It's also well suited for extreme sewage level measurement and has PDA approval for marine applications.

Heavy Duty Explosion Proof
This level probe is built for heavy-duty applications that require ATEX/IECEx or CSA intrinsic safety, or CSA explosion proof certifications. Its large float works well in dirty environments, and has been proven for years in the oil & gas and wastewater industries.

Made to Order
Probe length, float type, specific gravity, even outputs can all be customized to your needs. The RPM liquid level probe is meant to work for you.

No Fuss Operation
The RPM level float doesn’t struggle with many of the same variables that plague non-contact forms of measurement. With simple linear measurement, there is little that can disrupt the operation or the accuracy of the RPM.

Common Applications
  • C I, D 1 Hazardous Locations
  • Mud Tanks/Pits
  • Thick, Viscous, Sludgy Fluids
  • Wastewater
  • Sewage
  • Mixed Effluent




Supply Voltage
12-24 VDC for 4-20mA Output
0-5, 0-10, 0-15 VDC for Resistive Output
Cable Entry
¾ in. NPT


CSA Explosion Proof
Class I, Div. 1 Groups C & D, Ex d, IIb T3
CSA Intrinsically Safe
Class I, Div. 1 Groups C & D, Ex ia IIB T3 Ga
ATEX Intrinsically Safe
Ex II 1G Ex ia IIB T3 Ga
IECEx Intrinsically Safe
Ex ia IIB T3 Ga
Marine Certifications
ABS Certificate of Design Assessment


0-5, 0-10 VDC
Internet Connectivity


316L SS Stem
Polyurethane Float
316L SS Float
Cast Aluminum


Operating Temperature
-40 to 185° F