OleumTech Hardwired Sensors and Switches
FLOAT TYPE LEVEL SWITCH – SIDE MOUNT
Submersible Point Level Detection Solution

HLSFF
HIGHLIGHTS
- 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.
HARDWARE FEATURES | |
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Device Functionality | ∙ Point Level Detection Switch using Float-based Micro Switch Technology |
Interface | ∙ Relay |
MECHANICAL SPECIFICATIONS | |
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 |
ELECTRICAL SPECIFICATIONS | |
Signal Output | ∙ SPDT Micro Switch (Omron VX-5-1A2), 3 A / 250 Vac / 30 Vdc |
Output Types | ∙ Normally Open and Normally Closed |
CERTIFICATION & COMPLIANCE | |
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Safety | ∙ Explosion-proof/Flameproof for Use in Hazardous Locations |
∙ IECEx TUR 19.0035 | |
∙ Ex db IIB T5 Gb, Ex tb IIIC T100 °C Db |
GENERAL SPECIFICATIONS | |
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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 |
ORDERING INFORMATION | |
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Model Numbers Series | ∙ HLSFF |
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