DT85G Intelligent Vibrating Wire Data Logger

Call for configuration and price. 1-800-956-4437

  • Enhanced Web Interface
  • Vibrating Wire Strain Gauge Support
  • 16 to 48 Universal Analog Sensor Channels
  • ±30 V Input Measurement Range
  • 8 Digital Channels
  • 4 Counter Channels
  • Serial Sensor Channel
  • USB Memory Slot for Easy Data Transfer
  • Ethernet, USB, or RS-232 Communication with PC
  • SDI-12 and Modbus Sensor Support

Description

The GeoLogger

The dataTaker DT85G intelligent vibrating wire data logger is ideal for all geotechnical data logging applications. The dataTaker loggers have built-in support for vibrating wire sensors including Geokon, RST Instruments, slope indicator, soil instruments and more. They provide the ideal data acquisition and monitoring solution for the engineer working in the geotechnical environment.

Versatile Communication Methods

The low cost, low power dataTaker DT85G is extremely versatile and easy to configure for communications, data capture and data analysis. View the data in real time or store up to 10 million data points. Data storage and retrieval can be achieved via USB memory stick, FTP, cell phone, Modbus for SCADA, Ethernet or Web.

The web interface allows users to configure the DT85G, access logged data and see current measurements as mimics or in a list using a web browser.

The dataTaker loggers can monitor a wide variety of geotechnical datalogging applications including slope stability, subsidence, dam wall monitoring, tunnel and mining excavation, ground water, tunnel wall monitoring and site assessment.

Channels & Expansions

The dataTaker DT85G intelligent vibrating wire data logger has 16 analog channels capable of measuring up to 16 vibrating wire strain gauges with thermistors or 48 vibrating wire strain gauges without thermistors. The DT85G can be expanded simply by connecting dataTaker Channel Expansion Modules (CEM20) to provide 100 to 300 vibrating wire channels with thermistors.

Manage a variety of sensors or devices using the Sensor Power options via dedicated power output, digital outputs or the latching relay configurations.

Compatibility with Geo-technical Instruments

The advanced dataTaker DT80G range Geologgers work with a host of sensors including Extensometers, Piezometers, Inclinometers, Strain gauges, Pressure cells, Crack meters, Tilt meters and also support Carlson, Electrolevel and LVDT devices. They are expandable up to 300 channels and are compatible with all major brands of geotechnical sensors including Geokon, Slope Indicator, RST Instruments, Soil Instruments Roctest, and AGI – Applied Geomechanics Inc.

Specifications

Analog Channels
Analog Channels 2 Wire w/ Com. Ref. Terminal: 48 Channels (expandable to 960*)
2 Wire Isolated: 32 Channels (expandable to 640*)
3 or 4 Wire Isolated: 16 Channels (expandable to 320*)
* – Expansion requires optional CEM20
Analog Inputs Inter-Channel Isolation: 100 Volts (Relay Switching)
Analog Section Isolation: 100 Volts (Opto-Isolated)
Input Impedance: 100 KO, >100MO
Common Mode Range: ±3.5V or ±35V on 30 Volts Range
Analog Measurement Ranges Voltage: ±30 mVdc; ±300 mVdc; ±3 Vdc; ±30 Vdc
Current: ±0.3 mA; ±3 mA; ±30 mA
Resistance: 100O; 1,000O; 10,000O
Frequency: 100Hz; 10 kHz
Analog Measurement Resolution Voltage: 0.25µV; 2.5µV; 0.25µV; 250µV
Current: 2.5nA; 25 nA ; 250 nA
Resistance: 1.5 mO; 15 mO; 150 mO
Frequency: 0.0002%; 0.0002%
Accuracy DC Voltage: 0.1% (5°C to 40°C); 0.35% (-45°C to 70°C)
DC Current: 0.15% (5°C to 40°C); 0.45% (-45°C to 70°C)
DC Resistance: 0.1% (5°C to 40°C); 0.35% (-45°C to 70°C)
Frequency: 0.1% (5°C to 40°C); 0.25% (-45°C to 70°C)
Sampling Integrates over 50/60 Hz Line Period for Accuracy and Noise Rejection
Maximum Sample Speed: 25 Hz
Effective Resolution: 18 Bits
Linearity: 0.01%
Common Mode Rejection: >90dB
Line Series Mode Rejection: > 35dB
Sensor Excitation (Supply) Analog Channles: Selectable 250µA or 2.5mA Precision Current Source, 4.5V Voltage Source, or Switched External Supply
General Purpose: Switchable 12V Regulated Supply for Powering Sensors & Accessories (Max. 150mA)
Analog Sensors
Vibrating Wire Frequency range: 500 to 5kHz
Coil resistance: 50 to 200 Ohm
Stimulation method: single pulse pluck
Carlson Sensors — Built-in functions for strain and temperature.
— 4-20mA Current Loop Internal 100R shunt or external shunt resistor
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: 10O to 10KO
Thermistors Type: YSI 400xx Series, other Types*
Resistance Range: <10kO**
* Other Thermistor Types are Supported by Thermistor Scaling and Calculated Channels
** Resistance Range Can Be Increased with the Use of a Parallel Resistor.
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 100R Shunt or External Shunt Resistor
Digital Channels
Digital Input/Outputs 8 Bi-Directional Channels
Digital Input Type: 8 Logic Level (Max. 20/30 Volts)
Digital 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
— 32 Bit Size
— 10 Hz Max Count Rate
— Low Speed Counters do not Function in Sleep Mode
Dedicated Counter Channels — 4 High Speed Inputs or 2 phase encoder (quadrature 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 — 4 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: 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 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
Alarms
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
Condition High, Low or Within Range and Outside Range
Number of schedules 11
Schedule rates 10ms to days
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
USB Port Interface: USB 1.1 (virtual COM port)
Protocol: ASCII command
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
Serial Sensor Port Interface: RS232, RS422m, RS485
Speed: 300 to 57,600 baud
Flow Control: Hardware (RTS/CTS)
Software: (XON/XOFF), None
Protocols: Modbus (master & slave), Serial Sensor
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
— Download Data in CSV Format
— Command Interface Window
— Define Mimic Displays
Modbus Server(slave) Access current data and status from any Modbus client
FTP Server Access logged data from any FTP client or web browser
FTP Client Automatically upload logged data direct to an FTP server.
System
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 disk.
Real Time Clock Normal resolution: 200µs
Accuracy: ±1 min/year (0°C to 40°C), ±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
Typical Operating Time from internal 6Vdc, 1.2Ahr battery
1 Sec Sampling: 6.5 hours
5 Sec Sampling: 1 day
1 Min Sampling: 10 days
1 Hr Sampling: 3.5 months
Physical Environment
Construction Powder Coated Steel & Anodized Aluminum
Dimensions 300 x 137 x 65mm
Weight 2.5kg (5kg shipping)
Operating Range Temperature: -45°C to 70°C (Reduced LCD Operation Outside Range: -15°C to 50°C)
Humidity: 85% RH, Non-condensing

Software

dEX Software

dEX is an intuitive graphical interface that allows you to configure your data logger, view real-time data in mimics,
trend charts or tables and retrieve your historical data for
analysis.

dEX comes pre-installed on every logger in the DT80 range. The software loads in your web browser so there is no need to install cumbersome applications on your computer. Being browser-based, dEX will work on all major operating systems including Windows, Mac and Linux.

Configuration Editor

dataTaker dEX Configuration EditorThe configuration editor allows you to view, edit and save logger configurations in an easy-to-use Windows Explorer style user interface. The configuration tree view allows definition of measurement schedules and measurements.

Wiring diagrams show available wiring configurations for each sensor type. Configuration can be stored and retrieved on either the logger or a local computer.

Mimics and Charts

dataTaker dEX Mimics and ChartsMimics are organized into panels which can be modified to highlight custom alarm conditions or data grouping. Mimics include dials, bar graphs, thermometers, etc. Real-time chart recorder mimic allows you to view trends and historical data over a custom time/date range. Up to 16 mimics can be displayed on up to 5 mimic pages.

 

Minimum System Requirements

  • Web browser – IE7 or later, Safari, Google Chrome, Firefox
  • Adobe Flash Player (10 or higher)
  • Screen resolution of 1024 x 768

Accessories