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True cloud-based sensor configuration, logging, reporting and data analysis all-in-one.


Shark (RS232/RS485 Bluetooth Serial Adapter)


A cloud-based interface to configure hardware, visualize data, analyze measurements, manage alarms, calculations, and set up data routing.

MEASUREMENTS TO MIND (M2M) is a growing suite of Stevens products that embraces cloud-computing with an all-inclusive vision of shortening the communication path from the sensors to data on-line. That is, what the sensors MEASURE the MIND sees.

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SOLO (smart SDI-12 power manager)
JL-2 (solar charge controller)
Power Supplies
Solar Panels

Smart SDI-12 power manager that also provides remote power cycling.

The product finder lets you explore our catalog visually and filter products by type of monitoring, manufacturer, and more.

The product finder lets you explore our catalog visually and filter products by type of monitoring, manufacturer, and more.


Turbidity sensor

Part # 51154

dts-12 turbidity sensor

The DTS-12 is a turbidity and temperature sensor designed specifically to deliver high accuracy results from a sensor that can be easily field-deployed and requires very little maintenance.

The sensor features a 12-month recalibration interval and a built-in silicon wiper blade which helps minimize biofouling, helping to ensure accurate sampling from 0 to 1,600 NTU. The DTS-12 meets the quality standards of the USGS and has received their approval for in-situ turbidity monitoring.

Advanced Sensor Technology

In order to provide quality turbidity data, the DTS-12 takes 100 readings over five seconds, then computes and outputs the mean, variance, median, min, and max values. This statistical analysis compensates for entrained debris spikes and “cleans” the data, providing a precise measurement of bulk turbidity.

The DTS-12 uses Nephelometric geometry calculations to improve the signal-to-noise ratio by measuring the forward and back scattered light at a 90° angle to the light beam. Because of Nephelometry’s sensitivity, precision and applicability over a wide particle size and turbidity range, it’s the preferred method for measuring turbidity by the EPA.

The DTS-12 is simple to configure and use, offering a standard SDI-12 output for communication with data loggers or telemetry devices.

The housing and all metal hardware is made from marine-grade stainless steel, so it's suitable for freshwater and saltwater applications.

  • Measures temperature as well as turbidity
  • O-ring sealed for effective watertight security
  • Heavy-duty waterblock cable
  • Extended duty cycle wiper motor for years of service
  • Durable stainless steel universal joint for wiper mechanism
  • Thick-walled aluminum shell

The DTS-12 Measures Only One Parameter—Exceptionally Well.

The DTS-12 has been designed to provide stable, long-term accuracy, and offers unique features not found on any other multiparameter sonde or single-purpose turbidity sensor.

dts-12 durable head

Two cavities on either side of optic face allow debris to be flushed away from the wiper between wipes, and the top edge scrapes away any stubborn fouling from the wiper blade. The wiper also “parks” in one, which extends the flexibility of the wiper blade.

Angled head sheds bubbles that can form on the optic face and give false turbidity readings. It provides the ideal Nephelometric geometry for excellent accuracy across the full range. It also simplifies mounting and siting in shallow locations.

dts-12 removes bioufoul

Non-abrasive silicone wiper blade is designed for long-term deployment and eliminates optical face abrasion even in highly abrasive sediment-rich waters.

Optical face is made from Noryl and Delrin, selected for their field-proven durability and thermal stability. Large optic lenses virtually eliminate scratch induced measurement bias.

dts-12 quick connect

Optional quick disconnect cable connectors allow rapid on-site servicing and instrument swap.

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What's the Easiest and Quickest Way to Start Collecting Data and Access it Anywhere?

The Answer's in the Cloud.

eTracker is a cellular modem and "virtual" cloud-based data logger in one (meaning you don't need to install a separate data logger). Simply connect your sensor and a power source to eTracker and you're done. Configure (or reconfigure) anytime from any Internet-connected device, and use Stevens-Connect to retrieve your data, or forward it to your favorite software system.

Technical Specifications

Sensor type

Turbidity: Optical nephelometer (sidescatter)
Temperature: Encapsulated thermistor


0 to 1,600 NTU (nominal)


Turbidity: ±2% of reading + 0.2 NTU (0-399 NTU), ±4% of reading (400-1,600 NTU) (@ 25°C)
Temperature: ±0.2 °C


Turbidity: 0.01 NTU

Temperature coefficient

< -0.3% / °C

Supply voltage range

9.6V to 16V

Current consumption (typical):

Standby: 0.35 mA
Operating: 50 mA
Motor wiping: 200 mA

Depth rating

98 ft. (30m)

Wipe time

5 seconds (nominal)

Operating temperature

+32 °F to +104 °F (0 °C to +40 °C)

Communications protocol

SDI-12, version 1.3

Measurements returned

Instantaneous turbidity, from 100 samples taken, the following are computed: Mean, Variance, Median, BES, Min, Max, Temperature

Sample rate

20 Hz


12 in. (30.48 cm) x 2 in. (5.08 cm)


23.3 oz (604 g)