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Stevens Water Monitoring Systems, Inc.
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Stevens - Model Smart PT - SDI-12 / ...

Stevens - Model Smart PT - SDI-12 / Modbus -Level Pressure, Temperature and Digital Crest Gauge Sensor

FromStevens Water Monitoring Systems, Inc.

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Stevens’ Smart PT is a ceramic membrane pressure and temperature sensor that provides highly accurate measurements (0.05% of full scale) across a broad range of fluid level monitoring applications. In addition to real-time instantaneous readings, this intelligent sensor offers capabilities such as capturing peak crest levels and automatically sampling and reporting basic statistical data at configurable time intervals. The device features programmable corrections for local variations in Earth's gravitational field and automatically compensates for changes in water temperature and density. Encased in a corrosion-resistant stainless-steel housing with potted electronics, the Smart PT is designed to be durable and reliable for submersible water applications.

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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.

< ± 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

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.

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: ± 0.05% of full scale
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)
Body material: 316L Stainless Steel
Weight:

Probe: 120 g (4.23 oz.)
Cable: 40 g per m (0.43 oz. per ft)