Next Generation

Steelhead is leading the shift to a true Internet of Things (IoT) data acquisition experience that incorporates low-power, all-in-one, and patented technology.

Steelhead is a traditional data logger and provides two-way communications. Simple to set up, collect, manage, and analyze measurement by using the Steelhead mobile app via Bluetooth or Stevens-Connect cloud-based software.


Mix and match third-party sensor brands and types.

Easily configure to any SDI-12, Modbus RTU over RS-485, and/or Pulse sensors.

Access and Control Your Data Anywhere Anytime

The Steelhead has global cellular coverage easy set-up for seamless data links and actions between the remote sites and data management program.

Quickly visualize and transform your data into easy-to-use information.

Easy Configuration

Simple to set up, collect, manage, and analyze your data. Use the Steelhead mobile app via Bluetooth or Stevens-Connect to get started.

Unique Features


  • IP-68 (waterproof) enclosure
  • Waterproof sensor connectors
  • Integrated high-efficiency (MPPT) solar regulator
  • Enhanced power surge and lightning protection
  • Built-in GPS, internal barometric, humidity, and temperature sensors
  • Includes internal batteries and antennas


  • Integrated 4G Cellular with global coverage via an included SIM card
  • Reporting to Stevens-Connect or a third-party server via HTTP/HTTPS, FTP, or both
  • Data logger (no cellular connectivity) is an available option
  • Report immediately based on sampled data
  • Alarm conditions with auto change of logging and reporting frequency during event


• Connect via Bluetooth (BLE)
• Configuration: add/change sensors, reporting/sampling interval, and more!
• SDI-12 Transparent mode: talk directly to the sensor for diagnostics
• Current readings: take an immediate reading
• Download stored data


  • Configuration: add/change sensors, reporting/sampling interval,
    and more!
  • Create interactive dashboards with multiple stations and parameters
  • Notifications on measurement thresholds via text and/or email
  • Remote troubleshooting: battery voltage and percentage, cell signal
    strength and network, remote power cycling
  • Over-The-Air (OTA) firmware updates

Three Power Options

Battery Only

3-year battery life*

*Assumes 15-minute logging,
12- hour reporting, 2 sensors

Includes an internal 28 Ah
non-rechargeable battery

12 Watt Solar Panel

Stevens solar panel optimally designed for the Steelhead

Includes solar panel mounting bracket, an internal battery charging regulator, and both
a 10.5 Ah rechargeable and a 28 Ah non-rechargeable battery

External Power

7 to 16V DC / 3-amp power from an AC/DC adaptor or an external battery

Includes an internal 10.5 Ah rechargeable battery. AC/DC adaptor or external battery can be added

Data Collection and Analysis Applications

  • Environmental monitoring
  • Water resources
  • Weather
  • Tide gauging
  • Soil management
  • Stormwater
  • Tank levels
  • Open and close channel flow
  • Bioremediation
  • Scientific Research
  • Precision agriculture and horticulture
  • Golf & sports turf management (

Technical Specifications

Sensor DataLogging IntervalConfigurable from 1 minutes to 24 hours
Reporting IntervalConfigurable from 5 minutes to 24 hours
On-board storage400,000 records typical. depending upon the sensor type
Data Memory64MB Flash memoryNon-volatile Flash Memory, complete data retention with loss
of power
Sensor InterfaceSupported sensor typesSDI-12 bus
Modbus RTU over RS-485
2 Pulse inputs, individually configurable as low speed (100Hz)
or High speed (KHz)
Sensor Connectors3 x M12 A connectors. Connect more sensors using split cables
or break-out box
Sensor Power SupplySwitched
Power Output for Sensors12V DC with max. current source 200mA
Parameters30 sensor parameters in total
Number of Sensors10 ~ 20, based on the current consumption and number of
Internal Barometric SensorRange 300 to 1250 hPa | 12-month long-term stability: ±0.33
Absolute accuracy pressure (typ.): +/- 0.5 hPa; P=900 ...1100
hPa (T=25° to 40°C)
Relative accuracy pressure (typ.): ±0.08 hPa, P=900…1100 hPa
(T=25° to 40°C)
CommunicationsCellular4G LTE or Cat-M
AntennaInternal antenna: 698-875 MHz (1.9 gain) or 1710 – 2500 MHz
(3.7 gain)
Options: SMA connector for external antenna
Mobile App communicationBLE 5.0 Bluetooth low energy protocol
GPSGPS, GLONASS, BeiDou/Compass, Galileo and QZSS
Mechanical/ EnvironmentalDimensions240 mm x 170 mm x 60mm (9.44 in x 6.7 in x 2.3 in)
Enclosure MaterialUV-resistant polymer
Ingress ProtectionIP-68 (dust proof and waterproof up to 1 meter immersion for
30 minutes)
Operating Temperature-40°C ~ +80°C (-40°F ~ +176°F)
Lightning and Power ProtectionDedicated grounding lug
Each input, output, and sensor power line has isolated gas
discharge tubes, series current limiters, transient voltage
suppressors (TVS), electrostatic discharge, electrical fast
transient and lightning surge protection

* specifications subject to change without notice.


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