CAS DataLoggers

- Model DT82E - Environmental Data Logger


The new DT82E Environmental Data Logger Series 4 version has increased sampling speed, measurement range, and programmable analog output. The DT82E smart data logger provides an extensive array of features that allow it to be used across a wide variety of applications. The DT82E is a robust, stand alone, low power data logger featuring USB memory stick support, 18-bit resolution, extensive communications capabilities and built-in display. The dataTaker DT82E’s Dual Channel concept allows up to 4 isolated or 6 common referenced analog inputs to be used in many combinations. With support for 1 SDI-12 sensor networks, Modbus for SCADA systems, FTP and Web interface, 12V regulated output to power sensors, the DT82E is a totally self-contained solution.

Versatile Measurement

Connect an array of sensors through the versatile analog and digital channels, high-speed counter inputs, phase encoder inputs and programmable serial sensor channels. Temperature, voltage, current, 4-20mA loops, resistance, bridges, strain gauges, frequency, digital, serial and calculated measurements can all be scaled, logged and returned in engineering units or within statistical reporting. Set up sampling, logging, alarm and control tasks to suit your own requirements while interfaces for smart sensors, GPS and other intelligent devices expand the DT82E flexibility.

Superior Data Storage & Communications

With the standard unit able to store up to 10 million data points (expandable) you can log as much or as little as you need. Overwrite or stop logging once allocated memory is full, archive data on alarm event, copy to USB memory or transfer via FTP/ Email, the choice is yours.

Communications features include RS232 and Ethernet, connect to the DT82E locally, remotely through a modem or over the Internet. The web interface allows users to configure the DT82E, access logged data and see current measurements as mimics or in a list using a web browser.
FTP/ Email provides data to your office over the internet or wireless network, without the need for polling or specifi c host software.
Read more about how the DT82E environmental data logger was used in Water Quality Monitoring.

  • Dual Channel Isolation Technology
  • Up to 6 Analog (± 50V) sensor inputs
  • 8 flexible digital terminals
  • 1 Serial ‘Smart Sensor’ port
  • SDI-12 (multiple networks)
  • Programmable Analogue Output
  • Modbus for SCADA connection
  • Web & FTP client / server
  • USB memory for easy data and program transfer

Analog Channels

  • Analog Channels:
    • 2 analog input channels
    • Each channel is independent and supports: one isolated 3-wire or 4-wire input, or two isolated 2-wire inputs, or three common referenced 2-wire inputs
    • 2 Wire w/ Com. Ref. Terminal: 6 Channels
    • 2 Wire Isolated: 4 Channels
    • 3 or 4 Wire Isolated: 2 Channels
  • Fundamental Input Ranges: The fundamental inputs that the DT82E can measure are voltage, current, resistance and frequency. All other measurements are derived from these.
  • Sampling:
    • Integrates over 50/60 Hz Line Period for Accuracy and Noise Rejection
    • Maximum Sample Speed: 40 Hz
    • Effective Resolution: 18 Bits
    • Linearity: 0.01%
    • Common Mode Rejection: >90dB
    • Line Series Mode Rejection: > 35dB
  • Inputs:
    • Inter-channel Isolation: 100V (relay switching)
    • Analog Section Isolation: 100V (opto-isolated)
    • Input impedence: 160KΩ, >100MΩ
    • Current mode range: ±3.5V or ±55V (attenuator on/off)
  • Sensor Excitation (Supply):
  • Analog Channels:
    • Selectable 2µA, 213µA or 2.5mA Precision Current Source
    • 4.5V Voltage Source
    • or Switched External Supply
    • General Purpose: Switchable 12V/5V Regulated Supply for Powering Sensors & Accessories (Max. 150mA)
  • Analog Output: Isolated programmable 16-bit DAC: voltage 0-10V or current 0-24mA

Analog Sensors

  • Thermocouples:
    • Type: B, C, D, E, G, J, K, N, R S, T
    • Calibration Standard: ITS-90
  • RTDs:
    • Materials Supported: Pt, Ni, Cu
    • Resistance Range: 10Ω to 1MΩ
  • Thermistors:
    • Type: YSI 400xx Series, other Types*
    • Resistance Range: Up to 1MΩ
    • * Other Thermistor Types are Supported by Thermistor Scaling and Calculated Channels
  • Monolithic Temperature Sensors: Type: LM34 – 60, AD590, AD592, TMPxx, LM135, LM235, LM335
  • Strain Gauge and Bridge Sensors: Configurations: 1/4, 1/2 & Full Bridge
  • Excitation: Voltage or Current
  • 4-20mA Current Loop: Internal 100Ω Shunt or External Shunt Resistor

Digital Channels

  • Digital Input/Outputs:
    • 4 Bi-Directional Channels
    • Digital Input Type: 4 Logic Level (Max. 20/30 Volts)
    • Digital Output Type: 3 With Open Drain FET (Max. 30V, 100mA), 1 with Logic Output
  • Relay Output: 1 Latching Relay, contacts (Max: 30Vdc, 1A)

Counter Channels

  • Low Speed Counters:
    • 4 Counters Shared with Digital Inputs
    • 32 Bit Size, 10 Hz Max Count Rate
    • Low Speed Counters do not Function in Sleep Mode
  • Dedicated Counter Channels:
    • 4 High Speed Inputs
    • 32 Bit Size, 100kHz Max Count Rate
    • 2 Logic Level Inputs (Max ±30V)
  • 2 Sensitive Inputs (10mV) for Magnetic Pick Ups (Max. ±10V)

Serial Channels

  • SDI-12: 1 SDI-12 Inputs, Shared with Digital Channels
  • — Each input can support multiple SDI-12 Sensors
  • Generic Serial Sensor:
    • Flexible Option for Logging From Wide Range of Smart Sensors and Data Streams
    • Available ports: Host RS232 Port*
    • Baud Rate: 300 to 115,200
    • * If used as a Serial Sensor channel then the Host Port is Not Available for Other Communications

Calculated Channels

  • General: Combine values from analog, digital and serial sensors using expressions involving variables and functions.
  • Functions: Arithmetic, Trigonometric, Relational, Logical and Statistical


  • Condition: High, Low or Within Range and Outside Range
  • Delay: Optional Time Period for Alarm Response
  • Actions: Set Digital Outputs, Transmit Message, Execute any DataTaker Command.

Scheduling of Data Acquisition

  • Number of schedules: 11
  • Schedule rates: 10ms to days
  • Data Storage:
  • Internal Data Storage: Capacity: 128mb = approx 10,000,000 data points
  • Removable USB storage device: Type:compatible with USb 1.1 or USB 2.0 drivers, e.g. Flash drive
  • Capacity: approx 90,000 data points per megabyte

Communication Interfaces

  • Ethernet Port:
    • Interface: 10BasteT (10Mbps)
    • Protocol: TCP/IP, Modbus (Master & Slave)
  • Host RS232 Port
    • Speed: 300 to 115,200 Baud (57,600 Default)
    • Flow Control: Hardware (RTS/CTS), Software (XON/XOFF), None
    • Handshake Lines: DCD, DSR, DTR, RTS, CTS
    • Modem Support: Auto-Answer and Dial Out
    • Protocols: ASCII Command, TCP/IP (PPP), Serial Sensor, Modbus

Network TCP/IP Services

  • Network: Ethernet and/or Host RS232 (PPP) Communication Ports
  • Command Interface: Access the ASCII command interface via TCP/IP
  • Web Server:
    • Access Current Data and Status from any Web Browser
      • Custom pages can be defined — Download Data in CSV Format
      • Command Interface Window
      • Define Mimic Displays
  • Modbus Server(slave): Access current data and status from any Modbus client (e.g. SCADA system)
  • FTP Server: Access logged data from any FTP client or web browser
  • FTP Client: Automatically upload logged data direct to an FTP server.


  • Display and Keypad
    • Type: LCD, 2 Line by 16 Characters, Backlight
    • Functions: Channel Data, Alarms, System Status
    • Keypad: 6 Keys for Scrolling and Function Execution
    • Status LEDs: 4 (Sample, Disk, Attention, Power)
  • Firmware Upgrade: Via: RS232, Ethernet, USB or USB disk.
  • Real Time Clock:
    • Normal resolution: 200µs
    • Accuracy: ±1 min/year (0°C to 40&degC), ±4 min/year (-40°C to 70°C)
  • Power Supply:
    • External Voltage Range: 10 to 30 Volts DC
    • Internal battery: 6Vdc 1.2Ahr lead acid
    • Peak Power: 12 W (12VDC 1A)
  • Average power Consumption:
    • Using 12Vdc external power source
    • 1 Sec Sampling: 1350 mW
    • 5 Sec Sampling: 500 mW
    • 30 Sec Sampling: 135 mW
    • 5 Min Sampling: 70 mW
    • 1 Hr Sampling: 60 mW

Physical Environment

  • Construction: Powder Coated Steel & Anodized Aluminum
  • Dimensions: 180 x 137 x 65mm
  • Weight: 1.5kg (4kg shipping)
  • Operating Range:
    • Temperature: -45°C to 70°C (Reduced LCD Operation Outside Range: -15°C to 50°C)
    • Humidity: 85% RH, Non-condensing

Resources Included

  • Resource CD: Includes software, video training and user manual
  • Comms cable: USB cable
  • Line adapter: 110/240Vac to 15 Vdc, 800mA

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