Model 591

SKU: 591

Pressure Transmitter, Cable Suspended, Integral Electronics

The Delta Controls Model 591 Pressure Transmitter incorporates both sensor and electronics units in a single potted module that is protected by a Viton® sealed heavy stainless steel body. The lower body, sealed to an electrical cable, is supported from the well head. A vent tube in the cable connects and references the sensor to atmospheric pressure. The detected pressure, linearly proportional to the height of water above, converts it to a 4-20 mA signal equivalent to the liquid’s level.

It is maintenance free, and, unlike capacitance / admittance type devices, Model 591 is unaffected by algae growth and sludge coating. Calibration is checked without the unit being installed in a well or pit. The 591 is also useful for measuring tank levels. The flexible cable is easy to install, even with minimal head room. The small body diameter allows installation through a 0.75 inch NPT hole. The optional Tefzel cable jacket and Hastelloy® C-276 body are resistant to most corrosive agents.


  • 4-20 mA signal, 2-wire loop
  • Small size is easy to install
  • Fits 0.75 in NPT (23 mm) and easily slides into a 1.0 in (27 mm) pipe
  • Resistant to down hole pumps
  • Ranges 1 ft to 2500 ft (0.3 m to 762 m) in water
  • Support cable up to 4000 ft (1219 m) long
  • Unaffected by algae and buildup
  • Surge protectors
  • Optional cable support clamp
  • Sludge nose optional for dirty liquids
  • Second vent tube in cable to check down hole sealing
  • Maintenance free operation
  • HART® protocol compliant


  • Technology: Silicon strain gauge
  • Supply Power: 13 DCV to 35 DCV 2-wire loop powered
  • Output Signal : 4-20 mA dc, isolated
  • Maximum Loop Impedance: 550 Ω at 24 DCV, 1100 Ω at 35 DCV
  • Vent Tube: Desiccant filter or isolation bladder
  • Over Pressure: 2X range or 35 psi min (+2.5 bar) 3X range or 1000 psi min (+70 bar)
  • Operating Temperature: -20 °F to +180 °F (-29 °C to +82 °C)
  • Compensated Temperature: +30 °F to +130 °F (-1 °C to +55 °C) (higher available)
  • Accuracy: ≥ ± 0.5% FS
  • Thermal Error: ± 0.02% FS/ °F max
  • Barometric Effect: None
  • Communication:Device menus, HART communication protocol

Required Ordering Information

  • Detailed model number
  • Tag or nameplate detail (if required)
  • Factory calibration: custom range or full-scale
  • Documentation/testing tiers (if required, refer to Additional Resources in the product catalog)

Additional Information


Pressure Transmitter, Cable Suspended, Integral Electronics

Level Measurement


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