Submersible Pressure Transducer

The FTS Submersible PT is a high accuracy submersible pressure transducer. With additional features that provide enhanced functionality, including dual outputs; i.e., one analog (4…20mA, 0…5 VDC, 0…10VDC) and one digital (RS485). The RS485 interface provides level and temperature information. Also, it allows the user to rescale the analog output from 10…110% of the basic range. Additionally, the FTS Submersible PT is capable of a standard accuracy of 0.25% BR TEB and an optional 0.1% BR TEB. The FTS Submersible PT can be manufactured in 316L stainless steel or titanium for increased resistance to corrosion, notably from seawater.


  • Standard ±0.1% FS TEB or optional USGS OSW accuracies available
    – ±0.1% FS TEB on ranges up to 900 ft W.C.
    – Meets OSW spec on ranges up to 70 ft W.C. from 0…40°C.
  • 16-bit internal digital error correction for cost-effective low Total Error Band (TEB)2
  • Selectable digital outputs (SDI-12 or RS485) for maximum versatility.
  • RS485 modified-MODBUS and SDI-12 V1.3 protocol compatibility.
  • 316L stainless construction standard – Optional titanium for severe applications.
  • Lightning protection included.
  • Built in the U.S.A. ARRA Section 1605 Compliant.

The FTS Submersible PT provides outstanding Total Error Band (TEB)2 accuracy for reliable, accurate measurements in real-world conditions.

The FTS Submersible PT is ideally suited for environmental monitoring applications such as surface water, streams, and reservoirs using existing SDI-12 monitoring equipment.

The FTS Submersible PT is ideal for remote applications where battery-powered operation with minimal current draw and networking multiple sensors to a data recorder are required. And, the included lightning protection makes it more robust for installation in areas prone to high current and voltage transients.


Pressure Ranges1 Relative: Infinite between 0-3 and 0-900ftWC
Absolute: Available on request
Accuracy2,3,4 Pressure: Standard ±0.1% FS TEB
– Optional ±0.01 ft WC when reading ≤ 10ftWC or ±0.1% of reading >10 ftWC
Temperature: typ. ± 0.3 °C
Output5 Digital: SDI-12 + RS485
Pressure Resolution: 0.0005% FS
Temp. Resolution: < 0.01 °C
Comm. Protocol: SDI-12 V1.3, MODBUS RTU
Baud Rate: 1200 bits/s
CE: EN50081-1, EN50082-2

1. Level range may be specified in units of bar, mbar, mH2O, psi, ftWC, or inWC.
2. Total Error Band (TEB) includes the combined effects of non-linearity, hysteresis, and non-repeatability as well as thermal dependencies, over the compensated temperature range.
3. Optional accuracy is written in compliance with USGS OSW specification mandates.
4. Optional accuracy is written in compliance with USGS OSW specification mandates and limited to a compensated temperature range of 0…40° C.
5. The Submersible Pressure Transducer SDI can communicate in either SDI-12 or RS485 at any one time. By default, the Submersible Pressure Transducer SDI will ship in SDI-12 mode. A USB Dongle is required to change to RS485 mode.

© 2021 Forest Technology Systems Ltd.

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