The Stevens DLight is a flexible and versatile data logger, ideally designed for applications that don’t require as many inputs or outputs as the DataLogIC 3000. Four single-ended analog input channels are available and feature voltage surge and lightning protection to help protect sensitive instruments in areas with storm activity.

Supported measurement and sensor types include temperature, 0-5 VDC, 4-20mA, and pulse inputs for tipping buckets—with programmable logging and reporting intervals. The DLight provides a 24 VDC loop power supply with sufficient current to drive sensors.

The DLight provides several popular data bus I/O’s including; SDI-12, one RS-232 port (Tx only), and USB 2.0. It also features an SD card slot for storing up to two gigabytes of sampled data.

The DLight supports connection to telemetry over the RS-232 port for reporting data over cellular, UHF/VHF, or satellite systems such as GOES.

  • Inputs: Analog, Pulse, SDI-12 (up to 12 SDI-12 sensors)
  • Outputs: V-out, Alarm, RS-232
  • Simple telemetry configuration
  • High-speed USB 2.0 port
  • SD memory card slot
  • Multi-lingual Windows software for easy configuration and diagnostics, tabular analysis and data export
  • User-controllable channel and parameter names

Datalogger Comparison

Which Stevens data logger is right for your application?

Sensor  inputs

9 analog (0-5V & 4-20mA) / 1 pulse / 1 SDI-12

4 analog (0-5V & 4-20mA) / 1 pulse / 1 SDI-12

Sensor  power

24 VDC, 12 VDC, 5 VDC, (12VDC & 24VDC under firmware control)


Internal 2 GB flash / removable 2 GB SD Card

Serial ports

2 RS-232 / 1 USB 2.0

1 RS-232 / 1 USB 2.0


1 control output 0 – 5 V (steady state or pulse)

Touchscreen display option

Technical Specifications

Key Features

Processor 16-bit TI MSP430, and two 16-bit dsPIC microprocessors
On-board data storage 2 GB internal FLASH storage, plus removable 2 GB on SD memory card
Non-volatile memory All setup parameters and clock, lithium battery backup
Real-time clock Accurate to ±1 minute/month, leap year correction
Watchdog timer System resets upon microprocessor failure
Digital to analog (0-5 VDC) output 12-bit resolution
Serial ports
  • One (1) RS-232 (Tx only), minimum ±5 VDC levels, 1200 to 115K baud
  • One (1) USB 2.0 (fully compatible with USB 1.0 devices)
Power requirements 9.6 to 16 VDC, 7 mA standby current (telemetry system will require additional power)
Logging interval 1 minute to 24 hours
Message size 6 - 340 bytes typical

Sensor Input

Sensor input selections 4 analog channels, single-ended
Input type: 2 wire, 4 - 20 mA current loop, or 0 - 5 V with accessible DIP switch
Sensor power: 24 VDC (under firmware control), 12 VDC and 5 VDC (fixed)
Accuracy & resolution 0.01% accuracy, 0.002% resolution
Analog to digital (0-5 VDC) 21-bit resolution
Input impedance: 10 K ohm (min)
Pulse counter Input type: pulse
Sensor power: 5 or 12 VDC continuous
Maximum rate: 60 pulses per minute
Serial Input type: SDI-12 (up to 12 sensors)
Sensor power: 12 VDC continuous
Switched excitation voltage 24V/5W for 4-20mA sensor power


Temperature and humidity Operating: -40°F to 158°F (-40°C to 70°C)
Optional NEMA 4 enclosure: 100% condensing
Aluminum enclosure: 95% non-condensing
Physical size 5.53" x 3.06" x 1.95" (14.05 cm x 7.77 cm x 4.96 cm)


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