Model 551

SKU: 551

Pressure Transmitter, Compact Size

The Delta Controls Model 551 Pressure Transmitter Sensor includes an oil-filled 316-L Stainless Steel or Hastelloy® C-276 diaphragm that isolates the strain gauge bridge from the process liquid or gas. The back of the sensor is usually vented to atmosphere to compensate for barometric pressure changes.

The 551 has the entire electronics assembly epoxy sealed into the body. The advantage is the smaller size.


  • Small size for tight places
  • 2-wire loop powered
  • 4-20 mA dc
  • Integral Electronics/Sensor Module
  • Potted for corrosive locations
  • Surface mount silicon electronics
  • Used for pressure or level measurement
  • NPT, ANSI, DIN, or JIS Process Connection
  • Ranges from 12 inches in water to 1000 psi (0.3 bar to 70 bar)
  • Zero and Span pots for field recalibration
  • Spark and voltage surge protection
  • Maintenance free operation


  • Technology: Silicon strain gauge
  • Supply Power: 13 DCV to 35 DCV, 2-wire loop powered
  • Output:4-20 mA dc isolated
  • Maximum Loop Impedance: 550 Ω at 24 DCV, 1100 Ω at 35 DCV
  • Over Pressure Range:2X range or 35 psi min (+2.5 bar) 3X range or 1000 psi min (+70 bar)
  • Process Temperature:-20 °F to +220 °F (-29 °C to +104 °C)
  • Electronics Temperature: -20 °F to +185 °F (-29 °C to +85 °C)
  • Compensated Temperature:+30 °F to +180 °F (-1 °C to +82 °C) (other available)
  • Accuracy: ≥ ±0.5% FS
  • Thermal Error: ± 0.02% FS/°F max
  • Barometric Effect: None
  • Communication:Device menus, HART Communication protocol

Certifications & Approvals

  • Stainless Steel Housing Options Only Third Party Listed by CSA NRTL/C (USA and Canada)

Required Ordering Information

  • Detailed model number
  • Tag or nameplate detail (if required)
  • Documentation/testing tiers (if required, refer to Additional Resources in the product catalog)

Additional Information


Pressure Transmitter, Compact Size

Level Measurement


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Accessories and Related Products

Example Applications