Seametrics PT12 Pressure & Temperature with Modbus & SDI-12 Interface

[caption id="attachment_35468" align="aligncenter" width="200"]Seametrics PT12 Pressure and Temperature Sensor Seametrics PT12 Pressure and Temperature Sensor[/caption]

Feature

    • Modbus® RTU (RS485) and SDI-12 v1.3 interfaces
    • Small diameter — 0.75” (1.9 cm)
  • Pressure and temperature
  • 316 stainless steel, fluoropolymer, and PTFE construction (titanium optional)
  • Polyethylene, polyurethane, and ETFE cable options
  • End code interchangeable with a 1/4” NPT inlet
  • Specification per OSW Technical Memo 96.05 is an option on the 15 PSIG (10.5 mH₂O) and 30 PSIG (21 mH₂O) units

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.

Application

  • Rugged construction can replace analog sensors
  • Monitor groundwater, well, tank, and tidal levels
  • Pump testing
  • Flow monitoring

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Specification

Housing & CableWeight0.8 lb. (0.4 kg)
 Body Material316 stainless or titanium
 Wire Seal MaterialFluoropolymer and PTFE
 CableSubmersible: polyurethane, polyethylene, or ETFE; 4 lb./100 ft., 1.8 kg/30 m; 2000 ft max for Modbus®
 Desiccant1-3 mm indicating silica gel
 Field ConnectorAvailable as an option
TemperatureOperating RangeRecommended: -15 ̊ to 55 ̊C (5 ̊ to 131 ̊F) Requires freeze protection kit if using pressure option in the water below freezing.
 Storage Range-40 ̊ to 80 ̊C (-40 ̊ to 176 ̊F)
PowerVoltage9-16Vdc, 24Vdc over voltage protection, electromagnetic & transient protection IEC-61000 - 4-3, 4-4, 4-5, 4-6
 Supply CurrentActive 3mA average/ 10mA peak; sleep 150 μA
CommunicationModbus®RS485 Modbus® RTU, output=32bit IEEE floating point
 SDI-12SDI-12 (ver. 1.3) - ASCII
Output Channels TemperatureDepth/Level
 ElementDigital IC onboardSilicon strain gauge transducer, 316 stainless 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)
 Resolution0.06 ̊C0.0034% FS (typical)
 UnitsCelsius, Fahrenheit, KelvinPSI, FtH₂O, inH₂O, mmH₂O, mH₂O, inH₂O, cmHg, mmHg, Bars, Bars, kPa
 Range-15 ̊ to 55 ̊C (5 ̊ to 131 ̊F)GaugePSI: 1², 5, 7, 15, 30, 50, 100, 300
FtH₂O: 2.3², 12, 35, 69, 115, 231, 692
mH₂O: 0.7², 3.5, 5, 10.5, 21, 35, 70, 210
 Absolute²PSI: 30, 50, 100, 300
FtH₂O: 35, 81, 196, 658
mH₂O: 10, 24, 59, 200
 Compensated---0 ̊ to 40 ̊C (32 ̊ to 104 ̊F)
Max operating pressure1.1 x full scale
Overpressure protection3x full scale up to 300psi - for > 300psi (650 ft or 200 m) contact factory
Burst pressure1000 psi (approx. 2000 ft or 600 m)
EnvironmentalIP68, NEMA 6P

*Specifications subject to change. Please consult our web site for the most current data (seametrics.com). Modbus is a registered trademark of Schneider Electric.
1 Higher pressure ranges available upon request
2 ±0.25% accuracy FSO (max) at this range
3 The depth range for absolute sensors has 14.7 PSI subtracted to give actual depth allowed.

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