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

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 onboard 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

Specification :

Housing & Cable

Weight

0.8 lb. (0.4 kg)

Body Material

316 stainless or titanium

Wire Seal Material

Fluoropolymer and PTFE

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

Temperature

Operating Range

Recommended: -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)

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 onboard

Silicon 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)

Resolution

0.06 ̊C

0.0034% FS (typical)

Units

Celsius, Fahrenheit, Kelvin

PSI, FtH₂O, inH₂O, mmH₂O, mH₂O, inH₂O, cmHg, mmHg, Bars, Bars, kPa

Range

-15 ̊ to 55 ̊C (5 ̊ to 131 ̊F)

Gauge

PSI: 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

Absolute²

PSI: 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 pressure

1.1 x full scale

Overpressure protection

3x full scale up to 300psi - for > 300psi (650 ft or 200 m) contact factory

Burst pressure

1000 psi (approx. 2000 ft or 600 m)

Environmental

IP68, NEMA 6P

*Specifications are subject to change.
Please consult our website 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 the actual depth allowed.

Another Article:

• The Technology of the Ultrasonic Flowmeter
• Working Principle of Flow Meter
• How to Choose a Flow Meter
• Models and Types of Flow Meter
• Sound Velocity of Material