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Guidance on checking and replacing desiccant cartridges for optimal logger performance.
Steps for connecting the HOBO U12 logger to a computer via USB for data management.
Instructions on how to start data logging and retrieve recorded data using software.
Precautions to prevent damage to the logger from electrostatic discharge during handling.
Explanation of how the logger records sensor measurements (samples) and logger activities (events).
Description of the LED indicator lights and their meaning during logger operation.
Methods and hardware for securely mounting the logger in its deployment environment.
The HOBO U12 4-External Channel Outdoor/Industrial Data Logger (Part # U12-008) is a robust data logging device designed for outdoor and industrial environments. Its primary function is to record measurements from up to four external sensors, making it suitable for a variety of applications where environmental monitoring is required. The logger boasts a 12-bit resolution, allowing for precise data capture, and has the capacity to store up to 43,000 measurements or events.
One of the key usage features of this data logger is its versatility in accepting different types of external sensors. It can connect to temperature sensors, split-core AC current sensors, and is compatible with 4-20 mA and voltage input cables (which are sold separately). This broad compatibility allows users to tailor the logger to specific monitoring needs, whether it's tracking ambient temperature, electrical current, or other voltage-based signals. The logger's external inputs are designed to accept 0 to 2.5 DC Volts, providing a standard interface for many common sensors.
Connecting the logger to a computer for launching and data readout is straightforward, utilizing a direct USB interface. This simplifies the process of configuring the logger for a new deployment and retrieving recorded data. To operate the logger, an Onset software starter kit is required, which provides the necessary tools for setup and data management.
The logger's design emphasizes durability for outdoor and industrial use. It features a weatherproof case, tested to NEMA 6 standard, which protects the internal components from environmental elements. This makes it suitable for deployment in challenging conditions where exposure to moisture and dust is a concern.
When it comes to launching the logger, users have several options. It can be configured to start logging immediately, at a delayed time, or with a button press. If a button start is selected, the user simply presses and holds the button on the front of the logger for at least three seconds to initiate data recording. It's important to ensure that external sensors are plugged into the logger and activated in the software before launching, as selecting an external channel without a connected probe will result in false data. The logger can continue to log data even while being read out, or it can be stopped manually via the software or when its memory is full.
The logger's operation is confirmed by a light (LED) on the front. This LED blinks in different patterns to indicate its status: logging, awaiting a start, or during a button start launch. This visual feedback helps users quickly ascertain the logger's current state.
Mounting the logger is facilitated by the inclusion of four mounting screws and washers, allowing it to be secured to a wooden post. For mounting to a 1-inch pipe (1.3-inch outside diameter), U-bolt clamps (Part # U-BOLT-KIT) are recommended. UV-stable tie wraps can also be used as an alternative mounting method.
Maintenance features are designed to ensure the logger's longevity and accuracy. The device includes desiccant cartridges to absorb moisture inside the case. These cartridges are blue when new and fade to pale pink when they need replacement. Users can periodically check the desiccant cartridges through a viewing window on the logger's case. Replacing them involves removing the logger's cover, discarding the old cartridges, and installing new blue ones (Part # DESIC-PACK).
Battery replacement is another key maintenance aspect. The logger uses one 3-Volt CR-2032 lithium battery. Expected battery life is typically one year with logging intervals greater than one minute, though this can be reduced in extremely cold or hot temperatures or with faster logging intervals. Onset recommends installing a fresh battery before deployments where temperatures below 0°C (32°F) are anticipated. The battery replacement process involves disconnecting the logger from the computer, removing the cover, gently prying out the old battery, and sliding in a new one, positive side up, until it snaps into place.
Attaching sensors involves a careful process to maintain the weatherproof seal. Users must remove the logger's cover, then remove the dome nut and black rubber plug for the desired channel. The cable's plug end is then fed through the dome fitting and plugged into the corresponding port. A small amount of dishwashing liquid can be used as a lubricant if needed. Finally, the dome nut is threaded back on and tightened to ensure a secure seal. It's crucial to keep the black rubber plugs for any unused channels to maintain the weatherproof integrity.
Protecting the logger from electrostatic discharge (ESD) is also highlighted as a maintenance consideration. Static electricity can cause the logger to stop logging. To prevent this, users are advised to transport the logger in an anti-static bag and ground themselves by touching an unpainted metal surface before handling the device.
The logger's internal memory stores 64K bytes of data, accommodating up to 43,000 12-bit measurements. It can record two types of data: samples (sensor measurements at each logging interval) and events (independent occurrences like connecting to the host, low battery, end of data file, or button pushes). Button pushes, while possible, should be done when the logger is protected from moisture, as accessing the button requires removing the cover.
Overall, the HOBO U12 4-External Channel Outdoor/Industrial Data Logger is a versatile, durable, and user-friendly device designed for reliable data collection in demanding environments, with clear instructions for setup, operation, and maintenance to ensure long-term performance.
General| Memory Capacity | 43, 000 measurements |
|---|---|
| Battery Life | 1 year typical use |
| Communication | USB |
| Logging Rate | 1 second to 18 hours |
| Accuracy | ±0.35 °C from 0 to 50 °C (±0.63 °F from 32 to 122 °F) |
| Resolution | 0.03 °C at 25 °C (0.05 °F at 77 °F) |
| Response Time | 5 minutes in air moving 1 m/s (typical) |
| Operating Environment | 0 to 95% RH |
| Dimensions | 58 x 33 x 23 mm (2.3 x 1.3 x 0.9 in) |
