Hardwired Instrumentation Solutions

OleumTech Hardwired Sensors and Switches


Submersible Point Level Detection Solution



  • Provides point level detection of liquid using
    reliable micro switch design
  • Does not require power
  • Material: 316 SS (316L SS option)
  • Process temperature: -40 to 100 °C (-40 to 212 °F)
  • Electrical contact: SPDT (1C)
  • Pressure: 1500 PSI / 103 BAR max
  • 10” to 24” (250 to 610 mm) float to thread options
  • Supports Normally Open and Normally Closed
  • NEMA 4X, IP66
  • Zone 0 / Explosion-proof / Flameproof
  • Float Type Level Switch also available for top mount applications

Micro Switch Reliability / Low Maintenance

The Float Type Level Switch by OleumTech is part of the H Series line of high quality instruments delivering unrivaled performance, reliability, and accuracy in the most demanding environments, including hazardous locations.

The float-based level switch is designed to be mounted on the side of a liquid storage tank and is used for detecting either overflow (high) or dry run (low) detection for alarm, monitoring, and control applications.

The HLSFF provides a relay switch output (SPDT) and can operate in either Normally Open (NO) or Normally Closed (NC) mode.

Explosion-proof Float Level Switch / Durable 316SS

The H Series HLSFF Float Type Level Switch is certified for use in Zone 0 hazardous locations and is Explosion-proof / Flameproof.

The HLSFF is a simple apparatus and does not require power to operate. It provides a single actuation point and can be ordered with a custom stem/arm length with a variety of process connection fitting options. Its housing is made of 316 stainless steel while the level switch can be ordered with the 316 or 316L option.


Device Functionality∙ Point Level Detection Switch using Float-based Micro Switch Technology
Interface∙ Relay
Dimensions (Head)∙ 2.76" (W) x 2.76" (H) x 3.15" (D) / 70 mm (W) x 70 mm (H) x 80 mm (D)
Float to Thread Length∙ 10" to 24" (250 mm to 610 mm) in 1" Increments
Specific Gravity (SG)∙ >0.65
Package Dimensions (UF10)∙ 17" (W) x 4.75" (H) x 4.75" (D) / 432 mm (W) x 121 mm (H) x 121 mm (D)
Package Weight (UF10)∙ 4.5 lbs (2.0 kg)
Ports∙ One 1/2" NPT
Connection Fitting (Standard)∙ 2" NPT, see datasheet for all available sizes
Connection Fitting Options∙ NPT, BSP, PF, 150 lbs, 300 lbs
Enclosure Casing Material∙ Type 4X 316 Stainless Steel; IP66
Switch Material∙ 316 Stainless Steel (316L Option)
Operating Pressure (Maximum)∙ 1500 PSI / 105 kg/cm2 / 103 BAR
Signal Output∙ SPDT Micro Switch (Omron VX-5-1A2), 3 A / 250 Vac / 30 Vdc
Output Types∙ Normally Open and Normally Closed
Safety∙ Explosion-proof/Flameproof for Use in Hazardous Locations
∙ IECEx TUR 19.0035
∙ Ex db IIB T5 Gb, Ex tb IIIC T100 °C Db
Operating Conditions∙ Process Temperature: -40 to 100 °C (-40 to 212 °F)
∙ Ambient Temperature: -40 to 70 °C (-40 to 158 °F)
∙ Humidity: 0 to 99 %, Non-Condensing
Warranty∙ 2-Year Parts and Labor
Model Numbers Series∙ HLSFF