DT85 - Intelligent Data Logger with In-built Web Server

Product Description

The dataTaker DT85 is a smart data logger that provides anextensive array of features that allow it to be used across a widevariety of applications.

The Smarter Solution

The DT85 is a robust, stand alone, low power data loggerfeaturing USB memory stick support, 18 bit resolution, extensivecommunications capabilities and built-in display. The dataTakerDT85’s Dual Channel concept allows up to 32 isolated or 48common referenced analog inputs to be used in manycombinations.

With support for multiple SDI-12 sensor networks, Modbus forSCADA systems, FTP and Web interface, 12V regulated output to powersensors, the DT85 is ready to be rolled out into environmental,industrial and many other types of monitoring projects.

Versatile Measurement

Analog and digital channels, high-speed counter inputs, phaseencoder inputs and programmable serial sensor channels allow theDT85 to easily connect to most sensors and data measurementsources. Temperature, voltage, current, 4-20mA loops, resistance,bridges, strain gauges, frequency, digital, serial and calculatedmeasurements can all be scaled, logged and returned in engineeringunits or within statistical reporting. Group sampling, logging,alarm and control tasks within schedules to suit your requirements.Smart sensors, GPS, PLCs and other intelligent devices aresupported via 2 serial sensor ports (RS232 or RS422/485), with ouroptional CANgate interface available for CAN bus applications.

Manage a variety of sensors or devices using the Sensor Poweroptions via dedicated power output, digital outputs or the latchingrelay configurations.

Superior Data Storage and Communications

Store up to 5 million data points in user defined memory, log asmuch or as little as you need with independent control of schedulesize and mode. Overwrite or stop logging once allocated memory isfull. Archive data on alarm event, copy to USB memory or transfervia FTP, the choice is yours.

Communications features include RS232 with modem support, USB,Ethernet and USB memory stick ports. Connect to the DT85 locally,remotely or over the Internet. The web interface allows users toconfigure the DT85, access logged data and see current measurementsas mimics or in a list using a web browser. FTP provides data toyour office over the internet or mobile phone network, without theneed for polling or specific host software.

Applications include:

  • Research & Development
  • Structural Monitoring
  • Vehicle Testing
  • Agricultural Research
  • Strain Gauges
  • GPS
  • Weather Stations
  • Process Monitoring
  • CANgate (optional)
  • Total Energy Monitoring
  • Fault Identification
  • - CAN bus
  • Environmental Monitoring
  • Machine Down Time
  • - J1939
  • Temperature Profiling
  • Pressure
  • - OBDII
  • Thermistor Arrays
  • Load Cells
  • Aquaculture Flow


Technical Specification

Analog Channels

16 analog input channels (expandable to 320*)

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.The following

maximums apply.Two wire with common reference

terminal:48 (expandable to 960*) Two wire isolated: 32

(expandable to 640*)Three and four wire isolated: 16

(expandable to 320*)*Expansion requires optional CEM20

Fundamental Input Range

The fundamental inputs that the DT85 can measure

are voltage, current, resistance and frequency.

All other measurements are derived from these

Auto-ranging is supported over 3 ranges.


Accuracy table above is % of reading +0.01% of full scale.


Integrates over 50/60Hz line period for accuracy

and noise rejection

Maximum sample speed: 25Hz

Effective resolution: 18 bits

Linearity: 0.01%

Common mode rejection: >90dB

Line series mode rejection: >35dB


Inter-Channel Isolation: 100V (relay switching)

Analog Section Isolation: 100V (opto-isolated)

Input impedance: 100KΩ, >100MΩ

Common mode range: +3.5V or +35V on 30V range

Sensor Excitation (Supply)

Analog channels: selectable 250μA or 2.5mA precision

current source, 4.5V voltage source, or switched external


General Purpose: Switchable 12V regulated supply for

powering sensors & accessories (max 150mA)

Switchable 5V regulated supply for powering analog

sensors (max 25mA)

Analog Sensors

Supports a wide range of sensors including, but not limited

to, those listed below. A wide range of sensor scaling &

linearising facilities including polynomials, expressions &



Types: B, C, D, E, G, J, K, N, R, S, T

Calibration standard: ITS-90


Materials supported: Pt, Ni, Cu

Resistance range: 10Ω to 10KΩ


Types: YSI 400xx Series, other types*

Resistance range: <10kΩ*

* Other thermistor types are supported by thermistor scaling and calculated


**Resistance range can be increased with the use of a parallel resistor.

Monolithic Temperature Sensors

Types supported: LM34 - 60, AD590, 592, TMPxx

LM135, 235, 335

Strain Gauge and Bridge Sensors

Configurations: . , . & full bridge

Excitation: voltage or current

4-20mA Current Loop

Internal 100Ω shunt or external shunt resistor

Digital Channels

Digital Input/Outputs

8 bi-directional channels

Input Type: 8 logic level (max 20/30V)

Output Type: 4 with open drain FET

(max: 30V, 100mA), 4 with logic output.

Relay Output

1 latching relay, contacts (max: 30Vdc, 1A)

Counter Channels

Low Speed Counters

8 counters shared with digital inputs.

Low speed counters do not function in sleep mode.

Size: 32 bit

Max Count rate: 10 Hz

Dedicated Counter Inputs

4 high speed or 2 phase encoder (quadrature) inputs

Size: 32 bit

Max Count rate: 100 kHz

Input type: 2 logic level inputs (max ・}30V), 2 sensitive

inputs (10mV) for magnetic pick-ups (max ・}10V)

Serial Channels


4 SDI-12 inputs, shared with digital channels. Each input

can support multiple SDI-12 sensors.

Generic Serial Sensor

Flexible options to allow data to be logged from a wide

range of smart sensors and data streams.

Available ports: Serial Sensor Port (RS232, RS422,

RS485) or 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


Calculated Channels

Combine values from analog, digital and serial sensors

using expressions involving variables and functions.

Functions: An extensive range of Arithmetic,Trigonometric,

Relational, Logical and Statistical functions are available


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