8910-GeoNet-LoRa-DAS.pdf

General Specifications

Communications

The Model 8910 GeoNet Wireless Data Acquisition utilizes LoRa radio technol-ogy. The system topology takes the form of a star network. All data loggers communicate directly with the gateway.

The data loggers wake from sleep to col-lect and/or transmit data to the gateway and then return to sleep when finished to conserve battery life. Data loggers that get separated from the network will continue to collect and store data autonomously until network connectivity is re-established, at which time the data will be transmitted to the gateway.

Up to 8 networks can exist within radio range of one another by setting each to a different operating channel.

The data loggers can also operate using LoRaWAN® communication protocol for use with LoRaWAN third-party gateways.

Configuration of the network is accomplished by using the GEOKON API (api.geokon.com).

www.geokon.com/8910-Series

INTRODUCTION

The system consists of a gateway and subordinate wireless data loggers that transmit data collected from the con-nected sensors. The gateway controls the network and is the aggregator of all the data from the data loggers in the system. The gateway transfers collected data to the GEOKON cloud data storage platform, where it is securely stored.

Data can be viewed in GEOKON Agent Software or exported to a third-party software platform through the Open API.

(Offline configurator also available.)

Model 8960 Digital Vibrating Wire interfaces can be connected to GeoNet multi-channel VW and addressable data loggers to expand the capacity of the data logger. Multiple VW interfaces can be daisy-chained together to bus the data to a single data logger. The bus limit is 32 units or 64 channels. Refer to the Model 8960 data sheet for more information.

Available models include:

Single and multichannel Vibrating wire dataloggers that are compatible with most manufacturers' VW sensors.

A digital addressable data logger compatible with GEOKON addressable MEMS, VW, and thermistor sensor strings.

A four-channel analog data logger capable of reading data from analog sensors.

A tilt data logger that combines the functionality of a biaxial tiltmeter and a GeoNet data logger.

A data logger used to read time domain reflectometry cables.

A Digital High Power data logger that can read up to 250 GEOKON MEMS sensors. With custom firmware, it is capable of reading non-GEOKON sensors that utilize RS-485 MODBUS communication protocol.

Applications

Typical applications include:

� Groundwater monitoring

� Tailings dams

� Mining/slope stability

� Structural monitoring of buildings, bridges, excavations, and tunnels

� Historical structures

The GeoNet Wireless LoRa Data Acquisition System: a typical network configuration of data loggers, a cellular gateway and cloud integration with secure data access

Model 8910 Series

GEONET WIRELESS LoRa®

DATA ACQUISITION SYSTEM

Cellular Gateway geokon® server + openapi

Secure Cellular

(LTE-M/LTE)

Secure data access and visualization via geokon agent software or optional third party softwareTilt

Data Logger

Eight-Channel VW Data Logger

Addressable Data Logger

Topology Star

Radio Technology LoRa/LoRaWAN

Radio Frequency, ISM Band 868-928 MHz (user selectable masking by region)

Channels 8 (4 auto configurable)

Range1 Up to 20 km in rural open areas with line-of-sight Up to 5 km in urban areas

1Outdoor, clear line-of-sight. Depends on operating frequency.

Network Specifications

Power Supply DHP, GTW & TDR models: Internal sealed lead acid (SLA) battery pack, 4V, 10 Ah / 5-24V external All other models: 2× D cell, lithium / 5-24V external

Operating Temperature −40 °C to +85 °C (range varies by power source) (TDR model −20 °C to +70 °C (TLT model max of +65 °C)

Temperature Accuracy ±0.5° C

Direct Connection Type USB

Enclosure Die-cast aluminum, IP 68 rated to 1.5 m

Dimensions Refer to the product instruction manual geokon 48 Spencer Street Lebanon, NH 03766 • USA www.geokon.com e: teamsales@geokon.com p: + 1 · 603 · 448 · 1562 geokon is an iso 9001:2015 registered company

The geokon ® logo and word mark are registered trademarks with the United States Patent and Trademark Office. | geokon maintains an ongoing policy of design review and reserves the right to amend products and specifications without notice. | The LoRa® Mark is a trademark of Semtech Corporation or its subsidiaries. | LoRaWAN® is a registered trademark of the LoRa Alliance.® Modbus is a registered trademark of SCHNEIDER ELECTRIC USA, INC. | All other trademarks are the property of their respective owners.

Not all models are CE approved. Contact geokon for details.

©geokon. All Rights Reserved. | Rev-B.2-01/28/2026

ACCESSORIES

8900-SOL-10W-USB: GeoNet Series Solar Panel, 10W, unregulated.

KIT-GEONET-C-T20: USB 2.0 A Male to C Male Cable and T20 screwdriver.

BAT-202: Lithium D size battery, 17 Ah

COM-169: USB 2.0 A Male to C Male Cable TDR-PIGTAIL: Pigtail cable required to connect TDR-CBL cable to 8910- TDR logger

8910-01C Single-Channel VW Data Logger

8910-TLT

Tilt Data Logger

8910-DHP

Digital High Power Data Logger

8910-08C Eight-Channel VW Data Logger

8910-ADR

Addressable Data Logger

AVAILABLE MODELS

8910-GTW

Cellular Gateway

Vibrating Wire data Logger Specifications

Trueness 0.082 Hz

Frequency Precision ±0.146 Hz (99% CI)

Frequency Resolution ±0.002 Hz

VW Frequency Range 400 – 6,500 Hz

Range1 ±90°

Resolution 2 0.00025° (0.004 mm/m)

Precision 3 ±0.0075° (±0.13 mm/m)

Nonlinearity ±0.005° across ±30° range (±0.09 mm/m)

Temperature Dependent Uncertainty

±0.001° across ±5° angular range (±0.016 mm/m) ±0.0016° across ±15° angular range (±0.026 mm/m) ±0.0026° across ±30° angular range (±0.042 mm/m)

Axes 2

1 Calibrated Range: ±30° 2 99% confidence interval (i.e. 99 out of 100 individual readings fall within this tolerance).

3 Includes random walk (changes in consecutive readings with no discernible cause) and seismic noise during testing.

TILT data Logger Specifications

MEMS Sensors Limits per Model

Non-rechargeable ADR: 32 sensors Rechargeable ADR: 64 sensors (90 sensors, with the sensor string powered via external 12 V power supply) DHP: 250 sensors

Communication Protocol RS-485 Modbus

Digital DATA Logger Specifications

8910-ANA

Four-Channel Analog Data Logger

Pulse Generator Output 0 – 5V

Output Impedance 50 ohm

Pulse Length Variable (1 – 70 ns)

Waveform Averaging 1

Range 4000m 100% VOP

Resolution 15 cm x VOP/100

Current 250mA During Measurement

Pigtail Cable 50 ohm RG-8X 84% VOP Coaxial

Sensor Cable 50 ohm 1/2" 88% VOP Coaxial

TIME DOMAIN REFLECTOMETRY DATA LOGGER sPECIFICATIONS

Analog DATA Logger Specifications

Channels 4 lnput Type mV, V, mA, Ω lnput Range (individually configurable)

0 – 150 mV, 0 – 500 mV, 0 – 1 V, 0 – 5 V, 0 – 10 V, 0 – 15 V, ±150 mV, ±500 mV, ±1 V, ±5 V, ±10 V, ±15 V, ±20 mA, 0 – 20 mA, 4 – 20 mA

Voltage Mode Accuracy ±0.1% or better

Current in Mode ±0.2% or better

Resolution 16-bit

Zero Drift ±6 μV/°C

Span Drift ±25 ppm/°C (typical)

CMR @ 50/60 Hz 92 dB min.

8910-TDR

Time Domain Reflectometry Data Logger