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Smart PT Smart SDI-12 / RS-485 Pressure, Temperature, and Digital Crest Gauge Sensor

Updated:2025-03-13

Brand: Stevens
Model: Smart PT
Description: Stevens’ Smart PT is a ceramic membrane pressure and temperature sensor that delivers accurate results for a wide range of fluid level measurement applications. In addition to simple instantaneous mea
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Product Details

Smart PT Smart SDI-12 / RS-485 Pressure, Temperature, and Digital Crest Gauge Sensor Description：

Datasheet

Stevens’ Smart PT is a ceramic membrane pressure and temperature sensor that delivers accurate results for a wide range of fluid level measurement applications. In addition to simple instantaneous measurements, this smart sensor features the ability to capture peak crest levels, and to automatically sample and report basic statistics on a configurable time interval.

A corrosion-resistant stainless steel housing and potted electronics make Smart PT extremely durable and long lasting for submersible water applications.

Smart PT is available with a vented or absolute pressure sensing module. Both versions come equipped with user specified length of cable. The vent tube provides an atmospheric reference which compensates for variations in barometric pressure.

In addition to programmable corrections for local variations in Earth’s gravitational field, Smart PT also compensates automatically for the water temperature-density dependency.

Every Smart PT provides digital SDI-12, RS-485 and Modbus RTU over RS-485. Compatible with existing power and data logging instruments, the sensor can easily be deployed for data collection at remote monitoring sites.

Features

< ± 0.1% full scale accuracy

Aluminum oxide ceramic membrane

Digital output (SDI-12 / RS485)

Depth scales available from 2 meters (6.6 feet) up to 200 meters (660 feet)

Rugged housing and fully potted electronics – no risk of leaking

Compact size

Not damaged by freezing water

Vented or non-vented cable, user specified length

Direct pipe connection option

Low power consumption

Lightning protection

Overpressure tolerant

Unique Abilities

Average and standard deviation outputs on up to 3600 autosampled data points over configurable time window. Data is stored until requested using the M2 command.

Crest gauge function automatically captures minimum and maximum level and number of seconds since the event.

Smart autosampling can provide smoothing and oversampling.

Custom offsets.

Environmental corrections for local gravitational field and changes in fluid density due to temperature.

Technical Specifications

Supply voltage	6 - 28 VDC (12 VDC typical)
Current consumption	Average, SDI-12, one measurement per minute: 0.9 mA Average, RS-485, one measurement per minute: 1.5 mA Peak current, during response to host: 30 mA
Output	SDI-12 (Version 1.4) and RS-485 Selectable output: Pressure in bar, kPa, psi, or water depth in m, cm, ft. Temperature in °C or °F
Operating temperature	-20 °C to 80 °C (-4 °F to 176 °F)
Storage temperature	-40 °C to 80 °C (-40 °F to 176 °F)
Pressure accuracy	± 0.1% of full scale, temperature corrected
Temperature accuracy	± 0.25 °C (0.45 °F)
Wiring	Red: 6 - 28 VDC Black: GROUND Blue: SDI-12, White: RS-485 A/+ Green: RS-485 B/-
Cable	High durability polyurethane (26 AWG)
Pipe threading	M14-1
Dimensions	86.4 mm x 22.1 mm (3.4 in x 0.9 in)
Housing	316L Stainless Steel, Fully Potted, IP68
Weight	Probe: 120 g (4.23 oz.) Cable: 40 g per m (0.43 oz. per ft)