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Data Loggers

GeoNet Cellular Data Loggers | 8921 Series

The Model 8921 Series Cellular Data Loggers include the Single-channel VW, Addressable, and Tilt Data Loggers (top, left to right), and the 8-channel VW, 4-channel Analog, and Digital High Power Data Loggers (bottom, left to right).
  • The Model 8921 Series Cellular Data Loggers include the Single-channel VW, Addressable, and Tilt Data Loggers (top, left to right), and the 8-channel VW, 4-channel Analog, and Digital High Power Data Loggers (bottom, left to right).
  • The Model 8921-01C Single-channel Vibrating Wire, Model 8921-ADR Addressable, and Model 8921-TLT Tilt Cellular Data Loggers (left to right).
  • The Model 8921-08C 8-channel and Model 8921-ANA 4-channel Analog Cellular Data Loggers (left to right).
  • The Model 8921-DHP Digital High Power Data Logger.
  • Typical Networked Data Logger setup with cloud integration, secure data access and visualization via GEOKON AGENT software (or optional third party software).
  • AGENT software screenshot showing live data charts.
SKU:
8921 Series

The Model 8921 Series Cellular Data Loggers offer high-value, LTE Cat 1 compatible, networked data collection for all GEOKON vibrating wire instruments and addressable sensor strings.¹ The 8921 Series data loggers are ideal for smaller networks with a limited number of sensors, high-traffic areas (i.e. areas with radio interference), dense urban environments and areas with no line-of-sight between data loggers.

The GeoNet Network Data Loggers can be added to sites with existing GeoNet 8800 Series, GeoNet 8900 Series and/or GeoNet 8910 Series Wireless Data Hosting Systems, allowing additional data loggers to be placed in locations beyond the range of existing mesh networks. The data loggers are ready for deployment and data acquisition may commence within minutes after installation as no SIM card nor cellular provider activation are necessary.²

The system is compatible with all GEOKON Vibrating Wire instruments, addressable sensor strings and addressable thermistor strings.

The GeoNet Network Data Loggers collect their respective sensor data and provide seamless and secure cloud integration via the Internet and GEOKON OpenAPI. GEOKON OpenAPI is easy-to-use and allows users to activate data loggers, change settings, configure sensor channels, and view current data logger status. Industry leading data visualization software or the no-cost GEOKON Agent Software can be used with GEOKON OpenAPI for data viewing and reporting.

The capacity of GeoNet Multi-Channel and Addressable Data Loggers can be expanded using the Model 8960 Series Digital Vibrating Wire Interfaces, and Solar Panels of various wattages are available.

Multiple data logger types are available, including:

Vibrating Wire (VW) Data Loggers

Digital Data Loggers

  • Digital Addressable Data Loggers read all GEOKON addressable sensor strings (MEMS, VW, thermistor)
  • Digital High Power (DHP) Data Loggers are compatible with GEOKON Digital Addressable MEMS products and can read up to 250 GEOKON MEMS sensors or 500 GEOKON Model 6140 Sensors. With custom firmware, they are also capable of reading non-GEOKON sensors that utilize RS-485 Modbus® communication protocol.

Analog Data Logger

  • Four-channel logger capable of reading data from analog sensors

Tilt Data Logger

  • Combines the functionality of a biaxial tiltmeter with a GeoNet data logger

The capacity of GeoNet 8910 Series Multi-Channel and Addressable Data Loggers can be expanded using the Model 8960 Series Digital Vibrating Wire Interfaces, and Solar Panels of various wattages are available.

¹Addressable MEMS, VW and Thermistor strings.

²GeoNet Cellular Gateways are compatible with all major networks except Verizon.

Specifications

VW Frequency Range
400-6,500 Hz
Data Transmission Interval
Min: 10 minutes; Max: 24 hours
Power Supply
Rechargeable lithium battery / 5-24V external (01C, 08C, ANA, ADR, TLT);
Internal sealed lead acid (SLA) battery pack,
4V, 10 Ah / 5-24V external (DHP)
Operating Temperature¹
−40 °C to +85 °C (−40 °F to +185 °F)
−40 °C to +65 °C (−40 °F to +149 °F) (Tilt logger)
Tilt Range²
±90°
L × W × H
Please refer to the product instruction manual.

¹Lithium batteries will not charge below 0 °C.

²Tilt Data Loggers only. Calibrated range: ±30°

Custom Datalogger Designs

GEOKON offers a variety of Custom Datalogger options and members of our experienced staff will help with the modifications necessary to meet your specific requirements. To learn more, please visit:


Please Note: GEOKON maintains an ongoing policy of design review and reserves the right to amend products and specifications without notice. Various instruments are discontinued over time and replaced with new, updated models.

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