2852-OWI Remote Mounted Oil Water Interface Monitor

2852-OWI Remote Mounted Oil Water Interface Monitor


The 2852-OWI provides reliable monitoring of oil/water interface and emulsions. The sensing probe continuously monitors the capacitance of the inserted probe. As the interface or emulsion layer (rag layer) crosses over the probe, a proportional 4-20 mA output is provided. Typical applications include oil water separators, oil/water knock-out tanks, treater trains and decanting tanks.

The 2852-OWI sensing probe monitors the capacitance field around the probe. A calibration is performed against the an oil condition and a water condition. The active portion of the probe is fully submerged into the liquid and sized to your targeted range of interest. As the oil/water interface or emulsion crosses or envelopes the probe, the capacitance change is tracked and an output of 4-20 mA is provided.

Features & Benefits

  • No moving parts
  • Remote electronics via standard twisted pair
  • Explosion proof probe is standard
  • Probe is available with Intrinsically Safe option for alternative HazLoc protection
  • High corrosion resistant Teflon and stainless steel wetted parts
  • Capacitance technology responds to all oil types
  • HF capacitance technology does not foul or require routine cleaning
  • Easy calibration and control set-up
  • Remote monitor mounts safely away from the process

Technical Specifications

Control Unit

Operating Temp. -20˚C to +55˚C
Resolution .007% (.07 pF at 1,000 pF)
Accuracy .04% of full scale pF
Power Input 12 vdc or 24 vdc or 100-240 vac +/- 10%
Alarm Relay 2 x 10 amp@240 vac, SPDT dry, discrete relays with differential control (2852-OWI only)
Analog Output 4-20mA proportional output, non-isolated
Communication Modbus RS-485
Certified UL 61010-1, 2nd Edition
CAN/CSA-22.2 61010-1-4
IEC/EN 61010-1, 2nd Edition
IEC 61326-1
CE Declared
Enclosure Type 4/IP 66 painted steel
or Type 4X/IP 66 polycarbonate or SS
Optional Light, buzzer, beacon (2852-LT only)
2851-OWI as above: no relays, isolated 4-20mA


Probe -60˚C to +260˚C
PMC -60˚C to +55˚C
Approval CSA Div 1, Class 1, Groups C,D
ABSA-CRN #0F07450.2
Intrinsic Safety CSA Intrinsically Safe when ordered with Approved Barrier in Control Unit
Div 1, Class I, Groups A,B,C,D;
Class II, Groups E,F,G; Class III, Encl.Type 4
Wetted Parts 316SS and Teflon

Sensor materials are eligible for NACE MR-0175 Compliance





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