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D605 Thermistor Data Logger

Product Highlights
  • Monitors up to 4 plug and play Digital Temperature Cable (DTC) ports which connect up to 125 sensors
  • Run for years with the ultra low-power processor
  • Charge and recharge with the built in solar panel
  • 32 MB of data storage expandable to 1 GB
  • Transmit data from anywhere using direct-to-orbit connectivity
  • Bluetooth 5.0 wireless interface
  • Resist the elements with our IP67 factory seals


Log your data without logging the miles. The beadedstream D605 Thermistor Data Logger is built for remote deployments and reliable performance in extreme conditions. It can connect up to 4 digital temperature cables and can monitor up to 125 sensors. This temperature data logger has an enhanced solar power battery so you can collect long-term data. In addition, the datalogger is designed with Iridium satellite link and Bluetooth for your connectivity of choice.


The D605 data logger architecture allows for full flexibility to expand sensor interfaces and additional peripherals such as extra memory and data transmitting options (future developments).


4 plug and play Digital Temperature Cable (DTC) ports connect up to 125 sensors

Capacity for over 10 million samples

Pre-installed Iridium embedded two-way satellite data transceiver with integrated Iridium antenna can transmit data from any location worldwide.

3.5 watt solar panel with temperature compensated charge control circuit to protect and prolong battery life.

Don’t worry about moisture ingress - we’ve removed the screws and fully sealed the logger unit to provide additional protection from the weather.



● Bluetooth 5.0 wireless interface

● Compatible with Capture, beadedstream’s iOS app

Worldwide Telemetry

● Embedded two-way satellite transceiver and Iridium antenna

● 100% pole-to-pole worldwide coverage. integrated 1575.42 MHz GPS antenna


● 4 plug and play Digital Temperature Cable (DTC) ports, can monitor up to 125 sensors

● One additional custom-ordered port for the Sonic Range Sensor

Battery / Power

● No plug-in required.

● Rechargeable 6V 5.5Ah sealed lead-acid battery

● 6+ months without solar recharge (transmitting daily), survives northern winters

Integrated Solar

● 3 W integrated single-crystal silicon solar cell; works even in partial shading

● Full battery recharge with 5 days of sunlight

Data Storage

● Capacity for over 10 million samples

● 20+ years on-board data integrity

● 32 MB non-volatile flash data storage expandable to 1 GB

Software / Hardware

● Over the Air (OTA) software updates

● Built in self-diagnostics and logger health monitoring

● Open architecture for integrating most sensors and IoT technologies

● Built-in magnetic switch is immune to dust, dirt, mud and water.

● Used for advanced settings only for the D605

Operating Range

● -40° C to +60° C (-40° F to +140° F)

● Fully NEMA Type 4X/IP68


● Easy to mount with built-in features for pivot arm, hose clamps, and/or Unistrut

Weight and Dimension

● 2.3 kg (5.1 lbs) (without mount)

● 15.5 cm x 15.5 cm x 9.0 cm (6.1” x 6.1”x 3.5”)





For D405, D505, D605, and Buoy loggers:

  • Lead acid (rechargeable)
  • Safe for flying


For Spot logger

  • Lithium (This battery is not rechargeable. Do not try to recharge.)
  • Restricted for transportation (Dangerous Goods, Class 9 worldwide)
  • Uses a 3.6V 19Ah Tadiran TL-5930 Lithium Battery, available for purchase on Amazon.com, Amazon.ca (for Canada), and other local and online battery retailers. Customers are responsible for sourcing the battery.

The D605 data logger is designed to function reliably even during the wintertime when there’s limited or no light, such as on the North Slope of Alaska where it remains dark for up to two and a half months of the year. Despite minimal sunlight, it utilizes very little battery power during this period and will recharge when the sun comes back.

The D605 data logger boasts efficient solar charging capabilities, needing only about five days of sunlight within the year to replenish its battery fully. This minimal requirement ensures continuous operation, even in environments with sporadic or limited sunlight availability.

Yes, the data transmitted to the cloud is also stored locally on the D605 data logger. This ensures redundancy and provides a backup in case of any transmission issues.

No, the D605 data logger does not perform batch processing for data transmission. Both the logging and transmit frequencies are typically set to be the same for simplicity.

Yes, you can disable the satellite transmissions on the D605 data logger. You have the flexibility to turn off the modem if satellite transmissions are not required. Additionally, you can remotely toggle the modem on and off between monitoring periods or seasons, providing you with convenient control based on your specific needs.

When mounting the D605 data logger, it’s essential to orient it towards the equator and position it above the anticipated snow depth. To prevent the logger from being buried under heavy snowfall, mount it higher than the expected snow depth – for example, if anticipating eight feet of snow, position it at nine feet. Many users opt for tall poles, typically around eight to nine feet, to adjust the logger’s height as needed, especially in areas prone to significant snow accumulation, such as during avalanche monitoring activities. Additionally, using straps to elevate the logger off the ground onto a post or similar structure is recommended for accessibility and maintenance purposes.

The front face of the D605 data logger features a solar panel and is not a digital glass plate, as commonly misconceived. It is important to note that the front face is not touch-sensitive and does not function as a screen or display interface. Despite its appearance, it serves solely as a solar panel for powering the device.

Currently, the two primary mounting options for the D605 data loggers are hose clamps and pivot mounts, both commonly used to fix the logger to a post

The D605 data logger uses the Iridium network for satellite transmission. This choice of network often reassures users due to its reliability and extensive coverage, providing peace of mind regarding data transmission and communication capabilities from pole to pole.

The magnet included with the D605 data logger serves multiple purposes. Firstly, it makes the Bluetooth more visible, although it’s not a requirement for connection. Additionally, the magnet can perform a 15-second reset on the logger, which is akin to rebooting a computer. This reset does not result in any data loss stored on the logger. It’s important to note that the D605 data logger differs from previous generations in that it does not require constant magnet swiping. However, if used, the magnet can expedite certain functions and provide convenience in resetting the device.

To properly store your D605 data logger for extended periods, use NAP mode, a feature available in the Capture app designed specifically for storage purposes. Before storing the logger, activate NAP mode through the Capture app, which can be accessed via the loggers menu at the bottom of the screen. While in NAP mode, periodically check the batteries to ensure they remain charged for optimal performance when the logger is retrieved. You may notice the logger’s lights blinking in various colors, such as blue, green, and red, indicating its status. The blue light typically blinks every 10 to 15 seconds, serving as a confirmation of its operational status.

The Blue LED will be solid if an iOS device is connected to it via Bluetooth. If you observe solid LED lights, particularly red or blue (when not connected via Capture app), on your D605 data logger, it’s advisable to take action. Solid LED lights typically indicate an issue that requires attention. However, before contacting support, consider attempting a reset yourself, as this may resolve the issue. It’s worth noting that solid LED lights are uncommon, especially if you haven’t interacted with or connected to the logger recently. In most cases, solid green LED light signifies normal transmission activity, but if you’re uncertain, wait a few minutes to see if it turns off, indicating successful transmission. If the lights remain solid or if you’re unsure about their significance, please don’t hesitate to reach out to us for assistance.

Monitoring the battery voltage of your D605 data logger is essential for ensuring uninterrupted operation. Ideally, the battery voltage should remain above 6 volts, indicating a healthy power level. However, slight fluctuations may occur, with levels occasionally dipping to around 5.9 volts, signifying a cautionary “yellow mode.” If the voltage drops below 5.9 volts or exhibits a downward trend, it warrants attention as it may affect the logger’s performance.

It’s worth noting that the battery can be recharged even when its voltage is above 5.2 volts, providing an opportunity to maintain optimal functionality. Observing the battery trend on your dashboard can offer valuable insights, particularly during the darker winter months when voltage levels may decrease. Typically, from November to March, you may notice a gradual decline in voltage, followed by a recovery as spring approaches.

It’s recommended to periodically check your loggers for unplugged cables, as animals may disturb them. Avoid eating near the loggers during installation to prevent leaving food smells that could attract animals, potentially causing damage to the cables or dislodging them.

The data output from the D605 data logger is in Coordinated Universal Time (UTC), also known as Greenwich Mean Time (GMT). It’s important to note that this time zone does not change with daylight saving time adjustments. Therefore, users should consider this when interpreting the timestamps in the data.

No, the D605 data logger is currently designed to be used with beadedstream digital temperature cables provided by our company. Attempting to use cables from other companies may result in compatibility issues or damage to the logger. However, our cables can be used with other compatible loggers by using the Recite, MLink device or Ethernet Activator, offering versatility in data collection setups.

No, remote monitoring of the D605 data logger is only possible when connected via satellite. This includes diagnostic functions. Without a satellite plan, remote monitoring is not accessible. If you’re solely logging data without satellite connectivity, remote monitoring is not available.

The batteries in the D605 Data Logger generally last around four to five years under normal operating conditions. You can easily check the battery status using the Capture app by connecting to the logger. It will display the battery level in the top left-hand corner when connected. Please note that the four to five-year lifespan is based on proper charging conditions, particularly ensuring sufficient exposure to sunlight for solar recharging.


Please note that the D605 Data Logger is sealed, and if battery replacement is required, it needs to be done at our facility in Anchorage. This design ensures better protection against water ingress and other environmental factors compared to models like the D505, D405, and Spot Logger, where users can replace batteries themselves.

Each logger comes with a unique serial number prominently displayed on the right side of the solar panel. This allows for easy identification, ensuring you know exactly which equipment you have.

The maximum number of sensors per logger or per cable is 125. Whether you have one logger connected to a cable or multiple cables connected to a logger, the maximum remains 125 sensors.

Yes, the D605 data logger can be transported as checked luggage. However, it is advisable to place it in your carry-on luggage to ensure it arrives at the site safely. It contains a lead acid battery which is not restricted for transport.