Arjay Engineering Ltd.

- Model 2852-IFA - Liquid Interface Alarm



Reliable interface monitoring for alarm between two liquids. The sensing probe continuously monitors the liquid in a vessel and will alarm when the interface of a different dielectric liquid crosses the active probe. Typical applications include oil/water interface in pipes and separators, water accumulation in fuel tank bottoms, and product phase changes in process piping streams. The 2852-IFA sensing probe monitors the capacitance field around the probe. The probe is calibrated to one of the liquids. As the interface of the second product crosses over the probe, the probe capacitance changes. This change is used to activate the relays for alarm and control.

  • 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 liquid types
  • HF capacitance technology does not require routine cleaning
  • Easy calibration and control set-up
  • Capacitance technology does not foul or require cleaning
  • Remote alarm unit mounts away from the process for safety and ease of control wiring

  • 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
  • Analog Output: 4 mA normal / 20 mA alarm
  • 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

  • Probe: -60°C to +260°C
  • PMC: -60°C to +55°C
  • Approval: CSA Div 1, Class 1, Groups C,D
  • 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

Probe materials are eligible for NACE MR-0175 Compliance

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