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