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GeoNet Dataloggers | 8940 Series

  • Model 8940-01C-CBL, 8940-ADR-CBL, 8940-TLT-NAP GeoNet Loggers (top, left to right); Model 8940-04C-CBL and Model 8940-08C-CBL GeoNet Loggers (bottom, left to right).
  • Model 8940-01C-CBL Single-Channel VW Logger, 8940-ADR-CBL Addressable Logger and 8940-TLT-NAP Tilt Logger (left to right).
  • Model 8940-04C-CBL 4-Channel VW Logger and 8940-08C-CBL 8-Channel VW Logger (left to right).
  • Model 8943-01C-WP Single-Channel and 8943-04C-WP 4-Channel Waterproof Loggers (left to right).
8940 Series

The Model 8940 Series GeoNet Dataloggers offer high-value, localized data collection options for all GEOKON vibrating wire instruments and addressable sensor strings¹. The Model 8940 Series are available in five options, including single-, 4- and 8-channel dataloggers, addressable, and as a self-contained Tilt Logger for attachment to structures to measure any tilting that may occur.

GEOKON sensors are connected to the 8940 Series through cable glands or a 10-pin bulkhead connector. Sensor data is collected on site and downloaded to a host PC by direct connection to the datalogger. The freely availble GEOKON Agent Software is used for datalogger configuration, communication, monitoring, data collection and data reduction.

The capacity of Model 8940 Series Multi-Channel and Addressable Dataloggers can be expanded using the Model 8960 Series Digital Vibrating Wire Interfaces.

Waterproof single- and 4-channel GeoNet dataloggers, housed inside rugged PVC enclosures, are also available.

¹Addressable MEMS, VW and Thermistor strings.


Data Memory
32 MB
Storage Capacity
varies by model
Power Supply
2 × D cell, Alkaline or Lithium, 12V Auxiliary
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
L × W × H (Enclosure)
120 × 122 × 91 mm (single-channel/addressable/tilt loggers)
160 × 260 × 91 mm (4-channel logger)
180 × 280 × 101 mm (8-channel logger)
H × Ø (Waterproof Enclosure)³
216 × 141 mm (single-channel)
356 × 168 mm (4-channel)

¹Operating Temperature Range varies by power source.

²Tilt Loggers only. Calibrated range: ±30°

³Eye bolt and cable sleeve add approximately 82 mm to the height of each datalogger.

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.