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DT80G GeoTechnical Data Acquisition System

DT80G GeoTechnical Data Acquisition System



DataTaker Data Logger with 5 to 15 Analog Inputs and Vibrating Wire Support



  • Robust, Stand Alone, Low Power Data Logger with Dual Channel Isolation Technology
  • 5 Analog Channels (±30 Volt Range) Measuring 5 Vibrating Wire Strain Gauges with Thermistors or 15 Vibrating Wire Strain Gauges without Thermistors
  • Expandable to 100 Analog Channels
  • Records up to 25 Hz Maximum
  • Store up to 10 Million Readings/Samples




Data Channels Up to 5 Analog Channels (Expandable to 100 w/ #CEM20)
Up to 12 Digital & Counter Channels
Analog Channels 2 Wire w/ Com. Ref. Term: 15 Channels (Expand to 300)
2 Wire Isolated: 10 Channels (Expand to 200)
3 or 4 Wire Isolated: 5 (Expand to 100)
Analog Inputs Inter-Channel Isolation: 100 Volts (Relay Switching)
Analog Section Isolation: 100 Volts (Opto-Isolated)
Input Impedance: 100 KΩ, >100MΩ
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: 100Ω; 1000Ω; 10,000Ω
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 mΩ; 15 mΩ; 150 mΩ
Frequency: 0.0002%; 0.0002%
Analog Measurement 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)
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 10KΩ
Vibrating Wire Frequency Range: 500 Hz to 5kHZ
Coil Resistance: 50Ω to 200Ω
Stimulation Method: Single Pulse Pluck
Thermistors Types: YSI 400xx Series, other Types* 
Resistance Range: <10kΩ**
* 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 Types: LM34 - 60, AD590, AD592, TMPxx, LM135, LM235, LM335
Strain Gauge and Bridge Sensors Configurations: 1/4, 1/2 & Full Bridge
Excitation: Voltage or Current
Carlson Sensors Built-in Functions for Strain and Temperature
4-20mA Current Loop Internal 100R Shunt or External Shunt Resistor
Digital Channels 8 Bi-Directional Channels
Input Type: 8 Logic Level (Max. 20/30 Volts)
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 Inputs:
>> 4 High Speed or 2 Phase Encoder (Quadrature) Inputs
>> 32 Bit Size
>> 10kHz 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
>> Serial Sensor Port (RS232, RS422, RS485) or Host RS232 Port*
>> 300 to 115,200 Baud Rate
* If used as a Serial Sensor channel then the Host Port is Not Available for Other Communications
Calculated Channels Combine Values from Analog, Digital and Serial Sensors Using Expressions involving Variables and 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 Number: 11
Schedule Rates: 10ms to Days
Data Storage Capacity Internal: Approx. 10,000,000 Readings
External USB Drive: 90,000 Readings/MB
Ethernet Comm Port Interface: 10BaseT (10Mbps)
Protocol: TCP/IP
USB Comm Port Interface: USB 1.1 (Virtual COM port)
Protocol: ASCII Command
Host RS232
Comm Port
Speed: 300 to 115,200 Baud (527,600 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), Modbus, Serial Sensor
Serial Sensor Comm Port Interface: RS232, RS422m, RS485
Speed: 300 to 57,600 Baud
Flow Control: Hardware (RTS/CTS), Software (XON/XOFF), None
Protocols: Modbus, Serial Sensor
Network Ethernet and/or Host RS232 (PPP) Communication Ports
Web Server >> Access Current Data and Status from any Web Browser
>> Download Data in CSV Format
>> Command Interface Window
>> Define Mimic Displays
Modbus Server >> Access Current Data and Status from any Modbus Client (SCADA System)
FTP >> Access Current Data and Status from any FTP Client
>> Automatically Upload Logged Data Direct to an FTP Server
Display Type: LCD, 2 Line by 16 Characters, Backlight
Display Functions: Channel Data, Alarms, System Status
Keypad: 6 Keys for Scrolling and Function Execution
Status LEDs: 4 (Sample, Disk, Attention, Power)
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: N/A 
Peak Power: 12 W (12 Volts DC 1 Amp)
Power Consumption
1 Second Sampling Speed: 1350mW
5 Second Sampling Speed: 500mW
30 Second Sampling Speed: 135mW
5 Minute Sampling Speed: 70mW
1 Hour Sampling Speed: 60mW
Housing Constructed of Powder Coated Zinc & Anodized Aluminum
Operating Range Temperature: -45°C to 70°C
Humidity: 85% RH, Non-condensing
Standards Compliance CE
Weight 1.5 kilograms
Dimensions 18.0 cm x 13.7 cm x 6.5 cm (180mm x 137mm x 65mm)