How to Wire a SSPT or SSTT Subsea Transmitter

Wiring Guide for SSPT and SSTT Subsea Transmitters #

The SSPT (subsea pressure transmitter) and SSTT (subsea temperature transmitter) are designed for reliable performance in subsea environments. Proper wiring is crucial to ensure accurate data transmission and compatibility with your system. Below is a guide to wiring these transmitters, considering the available output types.

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1. 4-20 mA / 2-Wire Loop Powered #

• Description: The 4-20 mA output is a widely used standard in industrial applications. It provides a current signal proportional to the measured parameter (pressure or temperature).
• Wiring:
  • Connect the positive terminal of the transmitter (Pin 1) to the positive supply voltage.
  • Connect the negative terminal of the transmitter (Pin 2) to the signal return or ground.
  • Ensure a load resistor (typically 250-500 ohms) is installed in the loop for signal measurement.
• Notes:
  • This is a two-wire configuration where the same wires supply power and carry the signal.
  • Ensure the power supply voltage is sufficient to drive the loop, considering the load resistance.

2. 0-10 V / 3-Wire #

• Description: The 0-10 V output provides a voltage signal proportional to the measured parameter, suitable for systems requiring voltage-based inputs.
• Wiring:
  • Connect the positive power supply terminal to the transmitter’s power input (Pin 1).
  • Connect the signal output terminal (Pin 3) to the monitoring device’s input.
  • Connect the ground terminal to the system ground (Pin 2).
• Notes:
  • This is a three-wire configuration: power, ground, and signal.
  • Ensure the monitoring device has a high input impedance to avoid signal distortion.

3. 0.5 to 4.5 V / 3-Wire #

• Description: The 0.5 to 4.5 V output provides a ratiometric voltage signal proportional to the measured parameter, often used in systems with ratiometric ADCs (Analog-to-Digital Converters).
• Wiring:
  • Connect the positive power supply terminal to the transmitter’s power input (Pin 1).
  • Connect the signal output terminal (Pin 3) to the monitoring device’s input.
  • Connect the ground terminal to the system ground (Pin 2).
• Notes:
  • This is also a three-wire configuration: power, ground, and signal.
  • Ensure the power supply voltage matches the transmitter’s specifications for ratiometric operation.

General Wiring Tips: #

• Refer to the transmitter’s datasheet for specific wiring diagrams and voltage/current requirements.
• Use shielded cables to minimize electromagnetic interference (EMI), especially in subsea environments.
• Ensure all connections are secure and waterproof to prevent corrosion or signal loss.
• Perform a continuity check after wiring to ensure no open or short circuits.
• Consult the wiring configuration sheet for reference: https://stork.solutions/wp-content/uploads/2025/08/Wiring-Configuration-Sheet-Issue-04.pdf

By following these guidelines, you can ensure reliable operation and accurate data transmission from your SSPT and SSTT subsea transmitters.