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The Seametrics PT12 Pressure/Temperature Sensor has been designed to provide trouble-free submersible operation in liquid environments. 

This sensor communicates via SDI-12 (v1.3) or Modbus® RTU (RS485)protocol. Pressure/level is measured with an extremely rugged and stable piezo-electric, media isolated pressure element and compensated for temperature using our proprietary calibration methodology. Temperature is measured using an on-board digital chip. 

Seametrics also carries a special version of the PT12 designed to measure barometric pressure in reference to absolute pressure. If you are using an absolute PT12, contact your representative for details on how our PT12-BV can facilitate obtaining barometrically compensated pressure/level.
Features
  • Can transform your analog sensors into a digital sensor system
  • Easy to connect with SDI-12 recorders—convenient for an existing SDI-12 system
  • Features a Modbus® RTU communication interface for further flexibility
  • Offers great noise immunity, thermal performance, and transient protection

Specifications

Weight

  • 0.8 lb (0.4 kg)

Length

  • 8.44” (21.4 cm)

Diameter

  • 0.75” (1.9 cm)

Body Material

  • 316 Stainless Steel or titanium, Viton, Acetal

Cable

  • Submersible: polyurethane, polyethylene, or ETFE; 4 lb/100 ft., 1.8 kg/30 m; 2000 ft max. for Modbus®

Desiccant

  • 1-3 mm indicating silica gel

Field Connector

  • Available as an option

Operating Range

  • Recommended: -15° to 55° C (5° to 131° F) Requires freeze protection kit if using pressure option in water below freezing.

Storage Range

  • -40° to 80° C (-40° to 176° F)

Voltage

  • 9-15 Vdc, electromagnetic & transient protection IEC-61000 - 4-3, 4-4, 4-5, 4-6

Supply Current

  • Active 3 mA average/ 10 mA peak; sleep 150 µA

Modbus®

  • RS-485 Modbus® RTU, output=32bit IEEE floating point

SDI-12

  • SDI-12 (ver. 1.3) - ASCII

Element

  • Digital IC on board
  • Silicon Strain Gauge Transducer, 316 Stainless Steel or Hastelloy

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 % Full Scale (typical)

Range

  • -15° to 55° C (5° to 131° F)

Compensated

  • 0° to 40° C (32° to 104° F)

Max operating pressure

  • 1.1 x Full Scale

Over pressure protection

  • 3x full scale up to 300psi

Burst pressure

  • 1000 psi (approx. 2000 ft or 600 m)

Environmental

  • IP68, NEMA 6P

Documentation

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