Foxboro P0922YU Smart Differential Pressure Transmitter

Product Series: P0922 Series — Differential Pressure / Level Transmitter

Product Introduction:
The Foxboro P0922YU is a smart differential pressure transmitter from the P0922 series, designed for low-range differential pressure measurement. It is commonly used for filter monitoring, cleanroom differential pressure, airflow measurement, and low-range level measurement applications. It features HART 5/7 communication and silicon resonant sensing.

Category:
Description

Model Designation Breakdown:

  • P0922 = Differential Pressure Transmitter Series
  • YU = Range Code: 0–100 inH2O (0–249 mbar)
  • Process Connection: 1/2 NPT Male (Bottom Mount)

Technical Specifications:

Parameter Value
Measurement Type Differential Pressure
Range 0 – 100 inH2O (0 – 249 mbar / 0 – 24.9 kPa)
Output Signal 4 – 20 mA DC + HART 5/7 Protocol
Accuracy ±0.04% of URL
Long-Term Stability ±0.1% of URL per 5 Years
Process Connection 1/2 NPT Male (Bottom Mount)
Electrical Connection 1/2 NPT Conduit Entry
Wetted Materials Hastelloy C-276
Housing Material 316L Stainless Steel
Process Temperature -40°C to +120°C (-40°F to +248°F)
Ambient Temperature -40°C to +85°C (-40°F to +185°F)
Supply Voltage 12 – 42 V DC
Load Resistance (HART) 230 – 600 Ω
Protection Rating IP67 (NEMA 4X)
Intrinsic Safety IS (Ex ia IIC T4/T5/T6)
Flameproof Ex d IIC T6 (Option Available)
SIL Rating SIL 2 (IEC 61508)
Approvals ATEX, IECEx, FM, CSA, CCC

Working Principle:
Silicon resonant sensor (SenSys) — differential pressure across two ports deflects a central diaphragm, altering the resonant frequency of integrated silicon elements. The frequency difference is proportional to the differential pressure and is converted to a 4–20 mA output with HART 5/7 protocol communication.

Key Features:

  • Ultra-low DP range: 0–100 inH2O (24.9 mbar) — Ideal for cleanroom and filter monitoring
  • ±0.04% URL accuracy — Precision at low ranges
  • HART 5/7 protocol — Full remote diagnostics
  • Bidirectional overpressure: 250 inH2O (622 mbar)
  • Static pressure effect: ±0.02% URL per 1000 psi

Applicable Industries:
Cleanrooms, Pharmaceutical, HVAC (Filter Monitoring), Laboratory, Airflow Measurement, Building Automation

Installation Requirements:

  • Install with high-pressure port upward for gas service
  • Use equalizing manifold for zero adjustment
  • Impulse lines must be level and free of trapped liquid/gas
  • Maximum static pressure: 1000 psi (6.9 MPa)

Usage Notes:

  • Do not exceed 250 inH2O (622 mbar) overpressure on either port
  • Perform equalization before opening impulse line valves
  • Zero calibration must be performed with both ports at equal pressure
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