FLD-O2W-SP Sensing Probe for Oil-On-Water Leak Detection from Naftosense

FLD-O2W-SP Sensing Probe for Oil-On-Water Leak Detection from NaftosenseFLD-O2W-SP is a fully encapsulated high-performance sensing probe designed for detecting leaks of refined products or crude oil floating on the water surface in extreme environmental conditions. This probe can also be used as a cost-effective zero-false-alarms hydrocarbon fume detector. UV/ozone resistant, it is specially engineered for reliable operation during long-term immersion in water and in icing conditions and is suitable for polar applications. The maximum length of the sensor probe is limited to 48 in / 122 cm. The sensing probe can be wired to the acquisition module through an optional jumper cable with a maximum length of 300ft. / 90m.


Advanced measurement techniques and data treatment algorithms are used by Naftosense monitoring modules to provide quick detection in a wide temperature range. The sensor is reusable and easily detachable for cleaning.

The FLD-O2W-SP probe is designed to be used exclusively with acquisition modules or intrinsically safe field boxes offered by NAFTOSENSE. It provides industry-standard analog outputs, dry contacts, or serial communication protocols for flexible integration with third-party monitoring panels or PLCs.

FLD-O2W-SP is a passive simple element and is safe for installations in hazardous locations when connected to an intrinsically safe field box or wired through an approved Zener barrier to acquisition modules, alarm panels, or other monitoring equipment installed in the safe area. Please contact NAFTOSENSE for additional information.

Features

FLD-O2W-SP Sensing Probe for Oil-On-Water Leak Detection Features

  • Detects very quickly leaks of combustible liquids in a very wide temperature range in under 30 seconds!
  • 10-Year Factory warranty on Sensors that are cleanable and reusable after contamination
  • Dynamic leak alarms of the sensors relative contamination can be seen on display models
  • Fully passive sensor suitable for installations in hazardous locations
  • Able to detect quickly fumes/vapors diffused in the soil or aboveground

Specifications

FLD-O2W-SP Sensing Probe for Oil-On-Water Leak Detection Specifications

Operating Life30+ years at 104°F (materials tested in natural ageing conditions)
CompatibilityApproved NAFTOSENSE field boxes, monitoring modules and controllers
Maximum Diameter1.06 in (27 mm)
Ingress RatingIP68 suitable for outdoor/direct burial
Operating Temperature Range-40°F to +185°F (-40°C to +85°C)
Maximum Length of Cable/ProbeSensor Probe: 4 ft. (122 cm)
Leader Cable (AWG22 mini): 300 ft. (90 m)
Hazardous Locations ClassificationIS/ I/ 1/ ABCD/ T4 ; I/ 0/ AEx/ ia IIC T4 ; Class I, Zone 0, Ex ia T4
Class I, Div. 1, Groups A,B,C,D; T4 II 1 G Ex ia IIC T4 Ga

*FLD-O2W-SP probe can be interfaced with various approved acquisition modules for wired or wireless installations in hazardous locations. 

FLD-O2W-SP Sensing Probe for Oil-On-Water Leak Detection Times

Gasoline, Jet Fuel, Diesel20-28 seconds*
Light Crude Oil45-60 seconds
Heavy Crude Oil, Dilbit3-4 minutes
Motor Oil, Silicone Oil8-10 minutes
Propane, Butane25-30 seconds**

*These performance metrics are tested and validated by FM Approvals
**When detecting vapors/LPG, the sensing probe must be placed in the lowest point where the fluid will accumulate.
 

FLD-O2W-SP Sensing Probe for Oil-On-Water Leak Detection Product Codes

FLD-O2W-SP-6Passive Hydrocarbon Sensor Probe of 6-in (15 cm) with 10-ft (3 m) indoor-rated lead cable
FLD-O2W-SP-10Passive Hydrocarbon Sensor Probe of 10-in (25 cm) with 10-ft (3 m) outdoor-rated lead cable
FLD-O2W-SP-24Passive Hydrocarbon Sensor Probe of 24-in (61 cm) with 10-ft (3 m) outdoor-rated lead cable
FLD-O2W-SP-36Passive Hydrocarbon Sensor Probe of 36-in (91 cm) with 10-ft (3 m) outdoor-rated lead cable
FLD-O2W-SP-48Passive Hydrocarbon Sensor Probe of 48-in (122 cm) with 10-ft (3 m) outdoor-rated lead

On request, the leader cable can be extended to up to 100 ft (30 m) at the factory. Please consult for pricing options.

Applications

FLD-O2W-SP Sensing Probe for Oil-On-Water Leak Detection Applications

  • Leak detection around generators, Subbase tanks, day tanks, and supply and return plumbing in Data Centers, Industrial Facilities, Hospitals, and Commercial buildings
  • Fuel / Oil on water Leak detection in outdoor containment areas and sumps
  • Detection of leaking fuel oil from boiler installations, Fuel oil storage, and supply and return plumbing
  • Leak detection in fuel retail facilities

Q & A

Q&A Section with Expand/Collapse Icons

FLD-O2W-SP Sensing Probe for Oil-On-Water Leak Detection Q & A

+ What types of hydrocarbons can the FLD-O2W-SP detect, and how fast does it respond?
The probe detects a wide range of hydrocarbons, including gasoline, jet fuel, diesel, crude oils, blends, and motor oils floating on water. Response times vary by product—light fuels like gasoline or diesel are typically detected in 20–25 seconds, while heavy crudes or motor oils may take several minutes.
 
+ What environmental and durability specifications does it meet?
The probe is fully encapsulated and IP68-rated, making it suitable for continuous immersion, outdoor use, or direct burial. It operates from –40 °F to +185 °F (–40 °C to +85 °C), can be manufactured up to 48 inches in length, and has a leader cable of up to 300 feet. It is engineered for a service life of 30+ years and includes a 10-year warranty.
+ How is the probe installed and connected?
The FLD-O2W-SP is a passive device that must be connected to a Naftosense monitoring or acquisition module, or via an approved intrinsically safe barrier. It uses a leader/jumper cable sized correctly for signal integrity and must be installed in locations where hydrocarbon films or vapors are likely to accumulate, such as sumps or containment areas.
 
+ What certifications and safety approvals does it carry?

The probe is rated for hazardous areas when installed with approved equipment.

U.S.: Class I, Division 1, Groups A, B, C, D

ATEX/IECEx: Ex ia IIC T4, Zone 0, II 1 G

It has FM Approvals certifications, meeting standards for intrinsic safety and hydrocarbon leak detection.  
 

 
+ What maintenance is required, and how does it prevent false alarms?
The probe is reusable after exposure—it can be detached, cleaned, and returned to service. It distinguishes between new leaks and sensor fouling with progressive leak/contamination alarms. Its design minimizes false positives from water, methane, or vibration, and because it contains no active electronics at the probe itself, it offers high reliability in harsh conditions.
 


 

Downloads

Download Naftosense FLD-O2W-SP Sensing Probe for Oil-On-Water Leak Detection Datasheet

Talk to one of our technical specialists today at (855) 737-4718, or fill out our online form to learn more.

 
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