dt85gm geotechnical data logger

dataTaker DT85GM

16 Channel Geotechnical Data Logger with 3G Modem

  • Vibrating Wire Sensor Support
  • Carlson, Electro Level & LVDT support
  • Dual Channel Isolation Technology
  • Up to 48 Analog (± 50V) sensor inputs
  • Expandable to 960 analog inputs
  • Programmable Analog Output
  • Integrated cellular modem
  • Automatic data transfer via email or FTP
  • Sending alarm via SMS or email
  • Modbus for SCADA connection
  • USB memory for easy data and program transfer

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Description

DT85GM Geotechnical Data Logger

The new DT85GM Geotechnical Data Logger Series 4 version has increased sampling speed, measurement range, and programmable analog output.

Advanced design and technology plus 25 years of geotechnical expertise have produced the dataTaker DT85GM GeoLogger – A versatile, powerful – yet low-power & cost-effective data logger.

It supports vibrating wire and other geotechnical sensors such as Slope Indicator, RST Instruments, Geokon, Soil Instruments, Roctest, AGI – Applied Geomechanics Inc. DT85GM is also capable of testing sensor integrity through audible frequency

With temperature compensation (thermistor), 16 analog channels are capable of reading up to 16 vibrating wire sensors. If temperature compensation is not required this logger can read up to 48 vibrating wire sensors.

Further expansion up to 320 sensors (with temperature compensation) or 960 sensors (without temperature compensation) is possible.

Designed For Remote Applications

The dataTaker DT85GM intelligent data logger is a fully featured low-powered logging platform with an integrated cellular modem, making it perfect for remote applications. The rugged design and wide operating temperature range of the DT85GM provide reliable operation in virtually any environment.

The DT85GM’s perfect balance of performance with low power also allows you to use a smaller solar panel without compromising on functionality.

Automatic Data Delivery

Forget traveling long distances to get your data. Utilize the DT85GM’s automatic data delivery features to schedule your data to be automatically emailed to your inbox every day, week, month or other time intervals.

More sophisticated systems can make use of the automatic data delivery features to send logged data to an FTP server. Alarm conditions can also trigger data delivery in addition to sending alarm messages to multiple email addresses or mobile phones.

 

Specifications

Analog Channels
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
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 option CEM20
Fundamental Input Ranges The fundamental inputs that the DT85GM 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
Vibrating Wire Frequency range: 500 to 5kHz
Coil resistance: 50 to 200Ω
Stimulation method: single pulse pluck
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 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
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
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: 10BaseT (10Mbps)
Protocol: TCP/IP, Modbus (Master & Slave)
USB Port Interface: USB 1.1 (virtual COM port)
Protocol: ASCII command
Serial Sensor Port Interface: RS232, RS422, RS485
Speed: 300 to 57,600 baudFlow 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) ports
Command Interface Access the ASCII command interface via TCP/IP
Modbus Server(slave) Access current data and status from any Modbus client (e.g. SCADA system)
Modbus Server (master) Read/write data from modbus sensors and devices including PLC’s, dataTaker loggers, modbus displays etc.
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 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
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
Integrated Cellular Modem
Features Alarms: Send email or SMS messages
Data: send data to an email address or FTP server
Remote Access: Connect t dEX or Command interface
SIM interface: SIM Socket (1.8V/3V)
Networks and Frequencies Interaces: EDGE, GPRS, GSM, WCDMA, HSUPA, HSDPA
EDGE/GPRS/GSM Freq: 850/900/1800/1900 MHz
WCDMA/HSUPA/HSDPA Freq: 850/1900/2100 MHz
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

Software

dEX 2.0 Logger Software

dEX 2.0 is a software with an intuitive graphical interface for programming dataTaker that allows you to configure, view real-time data in widgets or charts, and retrieve your historical data for analysis.

After installation, you can run dEX 2.0 and establish a connection with your logger through a TCP/IP connection, using Ethernet or USB ports. The cross-platform software will work on major operating systems such as Windows, iOS, and Linux. Utilizing Angular JS which allows one page application for simplicity, this dEX 2.0 draws a new approach to programming and viewing data like never before.

Features:
  • Compatible with previous dEX program
  • Improved UI design with a single centralized page makes it easier to move between functions.
  • Offline configuration (program template creation)
  • Improved programming approach on schedule/channel creation
  • Re-defining alarm declaration
  • Re-defining MODBUS and SDI-12 channel creation
  • Home functions that target multiple loggers

Accessories