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Digital Pressure Transmitter

The P56 is a digital differential pressure transmitter designed for industrial pressure measurement applications. The on-board microprocessor provides high accuracy and improved stability in changing thermal environments. Communication via RS485 serial interface provides remote zero and span adjustment as well as pressure readings in engineering units

The P56 is designed for a wide variety of low pressure measurements where fast dynamic response, high resistance to vibration and superior signal stability through temperature change is required. The P56 will accept both liquids and gases directly at the sensing diaphragm.

The sensing element of the P56 can be changed by the user to allow calibration to a new full scale pressure. Replaceable sensing diaphragms are available with full scales from 3.5 In H2O through 3200 psi. Calibration settings are via supplied PC software and serial port connection.

The zero and full-scale outputs are set by switch or RS485 command. No potentiometer adjustments are required to calibrate.

Pressure readings via serial port are available in engineering units. The temperature of the sensor is also available via serial port.

The P56 has 1/8 inch female NPT pressure  connections and measures just 1.5 x 1.5 x 5 inches overall. 

The P56 is available in two output configurations: 4-20 mA current sink output and +/-5 Vdc output. Power for the P56 may be as low as +9 Vdc.

Wiring options for the P56 include a six-pin PT02A connector and pigtail leads. A 1/2 inch male NPT conduit thread connection for mounting a junction box is included with the
pigtail lead option.

The P56 is Ideal for:

• Flow Measurements
• Level Measurements
• Hydraulic Systems
• Vehicle Testing


  • RS485 Serial interface for digital operation
  • User re-rangeable sensing element
  • Excellent stability over wide thermal range
  • 0.25% FS Accuracy, 0.7% Max temperature error
  • For liquid or gas service
  • FS Ranges from 2.22 In H2O
  • NEMA 4 Housing
  • ±5 Vdc and 4-20 mA Versions