DHP-485 Digital Hydrocarbon Probe

Detects Hydrocarbons Directly in Water and Vapour.

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The detection and total measurement of petroleum hydrocarbons (TPH) was historically achieved by sampling followed by field or lab analysis. With the advent of PetroSense® DHP probes, the world’s first patented fibre optic chemical sensor built into a smart probe, it is now possible to measure ppm levels of total petroleum hydrocarbons (TPH) dissolved in water or as vapour in-situ. That is to say, in the field and in real time.
PetroSense DHP probes combine FCI's fibre optic chemical sensor (FOCS®) technology with digital electronics and an advanced microprocessor to make these products unique in the marketplace. FOCS technology is based on modulation of the transmitted light intensity when the sensor is exposed to hydrocarbons.
The FOCS sensor is designed with a proprietary chemical coating which responds reversibly to increasing or decreasing levels of hydrocarbons. The DHP probe is RS-485 compatible making it capable of being interfaced with many commercial data loggers, PLCs and samplers.
  • Detects Hydrocarbons Directly in Water and Vapour 
  • Detects Floating Liquid Product Instantaneously
  • Fast Response
  • Wide Dynamic Range 
  • 3rd Party Certified Equivalent to EPA Method 8020 
  • Intrinsically Safe* – UL, CUL, KEMA ia
  • Easy to Calibrate 
  • Stable 
  • Reliable
*When used with the FCI Environmental Intrinsic Safety Barrier.
Performance Vapour Water (PHA-100W, WL)
Operating Range
0-20,000 ppm as TPH
0-2,000 ppm as TPH
Lower Limit of Detection <10 ppm as xylene 0.1 ppm as xylene
Hydrocarbons Detected
C6 and higher MW petroleum hydrocarbons
C6 and higher MW petroleum hydrocarbons
Accuracy/Precision ±15% of reading ±10% of reading
Response Time (initial) <15 seconds <15 seconds
Response Time (to 95%) <1 minute <1 minute
Operating Temperature Range 0°-50° C 0°-50° C
Trend Correlation with GC data 95% 98% vs. EPA Method 8020


  • Salt Water Monitoring, Buoys, Water Intakes, Harbors, Marinas, Floats
  • Remediation Monitoring
  • Hydrocarbon Breakthrough 
  • Wastewater 
  • Leak Detection 
  • Process Fluids 
  • Stormwater Monitoring