Model P57

SKU: P57

Capacitance Probe, Parallel Ground

The Delta Controls Model P57 Capacitance Probe is commonly used in tanks made of reinforced plastics or metal tanks lined with rubber, glass, or plastic which do not contain the ground reference plane required by a RF admittance instrument. The P57 has a ground rod mounted parallel to the insulated sensing probe, which provides the required ground reference.

The ground rod increases the probe’s stability when when long insertion lengths are configured. The probe is widely used on water treating chemicals, stored fuel oil, day tanks, oil/water interface, and processed food oils. The open design allows it to be used in many applications, even when solids are entrained in the liquid.


  • Direct insertion, open construction
  • Rod parallel to sensing probe provides linear ground reference and increases sensitivity
  • PTFE sensing rod jacket allows operation in conductive or nonconductive liquids
  • Reliable high pressure PTFE seal
  • Can be used to measure liquids with entrained solids in most applications
  • Works in highly corrosive applications


  • Working Pressure: ≤ +1500 psig (+103.4 bar)
  • Working Temperature: -460 °F to +450 °F (-273 °C to +232 °C)
  • Insertion Length: ≤ 20 ft (6 m)
  • Process Connection : 1.5 in MPT minimum
  • Threaded Process Connection: 1.5 in to 2.0 in
  • Flanged Process Connection:1.5 in to 4.0 in
  • Flange Rating: ≤ 600 lb
  • Available Wetted Materials: 316 Stainless Steel, Hastelloy® C-276, PTFE, carbon steel
  • Ground Rod: 316 Stainless Steel, Hastelloy® C-276 (other materials available)

Required Ordering Information

  • Detailed model number
  • Tag or nameplate detail (if required)
  • Documentation & testing packages (if required, refer to Additional Resources in the product catalog)
  • Process fluid or material name
  • Process fluid or material dieletric constant
  • Maximum process temperature
  • Maximum process pressure
  • Upper and lower materials required for interface service

Additional Information


Capacitance Probe, Parallel Ground

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