Foxboro 685-069171-100 Pressure Transmitter Component

Product Type: Pressure Transmitter Sensing Element / Internal Module Assembly

Overview:
The Foxboro 685-069171-100 is a precision pressure sensing component used within Foxboro pressure transmitters. It serves as the core sensing element (diaphragm-based) that converts applied process pressure into an electrical signal. This part number identifies a specific revision of the sensor assembly compatible with Foxboro E-Series and I/A Series transmitter housings.

Category:
Description

Functional Features:

  • Converts process pressure (gauge, absolute, or differential) into a proportional electrical output
  • Utilizes capacitive sensing technology for high accuracy and long-term stability
  • Supports HART communication protocol for remote configuration and diagnostics
  • Designed for harsh process environments including high temperature and corrosive media
  • Compatible with Foxboro 266/265 series transmitter housings

Technical Specifications:

  • Measurement Type: Pressure (Gauge, Absolute, or Differential)
  • Sensing Technology: Capacitive silicon diaphragm
  • Pressure Range: Varies by configuration (typical range: 0 to 1000 psi / 0 to 69 bar)
  • Output Signal: 4–20 mA DC (2-wire) with HART 5/7 overlay
  • Accuracy: ±0.04% of calibrated span (typical)
  • Operating Temperature: -40°C to +125°C (-40°F to +257°F)
  • Process Temperature: -40°C to +185°C (-40°F to +365°F) depending on fill fluid
  • Process Connection: 1/2 NPT (standard), other options available
  • Wetted Materials: 316L Stainless Steel (standard), Hastelloy C-276, Monel, Tantalum (optional)
  • Fill Fluid: Silicone oil (standard), inert fluid options available
  • Overpressure Rating: 1.5× URL (Upper Range Limit)
  • Electrical Connection: 1/2 NPT conduit entry with cable gland

Material Composition:

  • Sensing Diaphragm: 316L Stainless Steel or Hastelloy C-276
  • Housing: 316L Stainless Steel
  • O-Rings: Viton (standard), Kalrez (high-temperature option)
  • Electronics Encapsulation: Epoxy-sealed PCB with conformal coating

Applicable Industries:
Oil and Gas (upstream/downstream), Chemical Processing, Refining, Power Generation, Pharmaceutical, Food and Beverage, Pulp and Paper

Installation Requirements:

  • Installed in a Foxboro E-Series or I/A Series compatible transmitter housing
  • Requires proper process connection orientation (vertical or horizontal with zero suppression as needed)
  • Impulse lines must be purged and filled with appropriate fill fluid
  • Must be configured using Foxboro FieldMaster or AMS Trex communicator

Advantages:

  • High accuracy and stability over extended operating periods
  • Wide temperature range capability with appropriate fill fluid
  • HART protocol enables remote diagnostics without process shutdown
  • Multiple wetted material options accommodate corrosive and sanitary applications
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