Seametrics PT12-BV Barometric and Vacuum Sensor


Seametrics PT12-BV Barometric and Vacuum Sensor comes as a weatherproof stand-alone box or with an automatic compensation wiring option. The PT12-BV measures pressure, temperature, and supply voltage.

The weatherproof box is an ideal barometric reference for absolute pressure sensors. This version features both an SDI-12 interface and a Modbus® RTU interface that makes the product easy to connect to recorders and operates on low power. This makes it a preferred choice for many environmental professionals with existing SDI-12 or Modbus® RTU systems.

Seametrics PT12-BV Feature

  • Weatherproof box
  • Automatic barometric compensator
  • SDI-12 v1.3 interface and/or Modbus® RTU interface (Depends on version)
  • Pressure/vacuum and temperature
  • Polyethylene, polyurethane, and ETFE cable options

With the Compensation Wiring Option, the PT12-BV automatically provides barometric compensation for a single attached absolute PT12 submersible pressure sensor. No post-processing of data. No need to use a vented cable or worry about maintaining desiccant tubes. This version features an SDI-12 communication interface, making it ideal for many existing environmental systems.


  • Barometrically compensate for absolute pressure sensors for level measurement
  • Measure vacuum pressure during vapor extraction pilot testing
  • Supplement aquifer test data in leaky or confined conditions
  • Measure accurate barometric pressure

Seametrics PT12-BV Specification

Material Weatherproof box – ABS – IP66/67
Dimensions Box only: 4.3” x 3.1” x 2.5” (10.9 x 7.9 x 6.4 cm)
Wire Seal Material Fluorocarbon and Buna N
Communication Pigtail 5 ft (1.5 m) polyurethane cable
Options PT12-BV compensation wiring option; Bulkhead connector
Temperature Operating Range Recommended: -15 ̊ to 55 ̊C (5 ̊ to 131 ̊F) Not designed to operate under water
Storage Range -40 ̊ to 80 ̊C (-40 ̊ to 176 ̊F)
Power Voltage 9-16Vdc, 24Vdc over voltage protection, electromagnetic & transient protection IEC-61000 – 4-3, 4-4, 4-5, 4-6
Supply Current Active 3mA average/ 10mA peak; sleep 150 μA
Communication Modbus® RS485 Modbus® RTU, output=32bit IEEE floating point
SDI-12 SDI-12 (ver. 1.3) – ASCII
Output Channels Temperature Depth/Level
Element Digital IC on board Silicon strain gauge transducer, 316 stainless
Accuracy ±0.5°C — 0° to 55°C (32 ̊ to 131 ̊F)
±2.0°C — below 0°C (32 ̊F)
±0.05% FSO (typical, static)
±0.1% FSO (maximum, static)
(B.F.S.L. 20 ̊C)
Resolution 0.06 ̊C 0.0034% FS (typical)
Range -15 ̊ to 55 ̊C (5 ̊ to 131 ̊F) 0-16 psia (110 kpa)
Compensated 0 ̊ to 40 ̊C (32 ̊ to 104 ̊F)
Over pressure protection 2x
Environmental IP66/67

*Specifications subject to change. Please consult out a web site for the most current data ( Modbus is a registered trademark of Schneider Electric.

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