Product Overview
The Walfront BSIDE BTH81 is a high-precision digital temperature and humidity data logger designed for accurate environmental monitoring. It offers high precision, fast data acquisition, and good stability, making it suitable for various applications including warehouse management, logistics, transportation, telecommunication rooms, intelligent buildings, subways, malls, and libraries.

Figure 1: Walfront BSIDE BTH81 USB Temperature Humidity Data Logger.
Key Features
- Data Storage: Capable of recording and storing a total of 16,384 data points (8,192 groups).
- USB Connectivity: Features a USB interface for direct connection to a computer to extract recorded data.
- PDF Export: Directly generates PDF documents for easy data analysis and reporting.
- Alarm Function: Allows setting of high and low alarm values, with LED indicators for alerts.
- Temperature & Humidity Recording: Specifically designed for accurate temperature and humidity data logging.
Package Contents
Please verify that all the following items are included in your package:
- 1 x Data Logger
- 1 x Base
- 2 x Sticker (for adhesive mounting)
- 1 x Bag of Screws (for fixed mounting)
- 1 x User Manual

Figure 2: Included components of the Walfront BSIDE BTH81 data logger set.
Setup and Installation
Powering the Device
The BTH81 data logger is battery-powered. Before initial use, ensure a compatible button battery (typically CR2032, though not explicitly listed in specifications, it's a common type for such devices) is correctly installed. Refer to the device's battery compartment for polarity and type.
Mounting Options
The device can be mounted using either adhesive stickers or screws, depending on your preference and the surface type.
Adhesive Mounting
For temporary or non-invasive mounting, use the provided adhesive stickers. Peel off the protective film from a sticker and apply it to the back of the device's base. Press firmly onto a clean, flat, and smooth surface.

Figure 3: Adhesive mounting method.
Screw Mounting
For a more permanent and secure installation, use the provided screws. Position the device's base on the desired surface and mark the screw hole locations. Drill pilot holes if necessary, then firmly fix the support base with the expansion screws.

Figure 4: Screw mounting method.
Operation
Starting and Stopping Data Logging
To initiate data logging, press the START STOP button located on the front of the device. The device will begin recording temperature and humidity data at its set sampling interval. To stop logging, press the START STOP button again. The LED indicators (RED/GREEN) will provide status feedback.
Data Extraction and Analysis
The BTH81 data logger allows for easy data extraction via its integrated USB interface. Simply remove the protective cap to expose the USB connector and plug the device directly into a computer's USB port. The device is designed to directly export data in PDF format, simplifying data analysis and reporting without requiring specialized software.

Figure 5: USB interface for data extraction.
Setting Alarm Values
The device supports setting high and low alarm thresholds for both temperature and humidity. When the recorded data exceeds or falls below these predefined values, the device will indicate an alarm condition, typically via its LED indicators. Consult the full user manual (included in the package) for detailed instructions on configuring alarm settings.
Maintenance
Cleaning
To maintain the device's performance and appearance, wipe it clean with a soft, dry cloth. Avoid using abrasive cleaners or solvents that could damage the plastic casing or internal components.
Battery Replacement
When the device's battery is low or depleted, replace it with a new, compatible button battery. Refer to the battery compartment for specific battery type and replacement instructions. Ensure correct polarity during installation.
Troubleshooting
This section addresses common issues you might encounter with your data logger.
- Device Not Powering On:
- Ensure the battery is correctly installed with the proper polarity.
- Check if the battery is new and fully charged. Replace if necessary.
- Data Extraction Issues:
- Ensure the device is securely plugged into a USB port.
- Try a different USB port or computer.
- If your organization has strict IT security policies, the direct PDF export feature might be blocked. Consult your IT department.
- Inaccurate Readings:
- Ensure the device is placed in an environment free from direct sunlight, strong air currents, or heat sources that could affect readings.
- Verify that the sensor openings are not obstructed.
- Device Not Responding:
- Remove and reinsert the battery to perform a soft reset.
- If the issue persists, contact customer support.
Technical Specifications
| Feature | Detail |
|---|---|
| Model Name | BTH81 |
| Brand | Walfront |
| Product Dimensions | 2.99 x 1.61 x 0.94 inches |
| Weight | 2.12 ounces (approx. 80g) |
| Outer Material | Plastic |
| Display Type | Digital |
| Connectivity Technology | USB |
| Power Source | Battery Powered |
| Special Feature | High Accuracy |
| Units | ℃/℉ |
| Resolution | 0.1%RH, 0.1℃ |
| Data Storage Capacity | 16,384 data points (8,192 groups) |
| Product Care Instructions | Wipe Clean |
Warranty and Support
For warranty information, technical support, or any inquiries regarding your Walfront BSIDE BTH81 data logger, please refer to the contact details provided in the original product packaging or contact the seller/manufacturer directly. Keep your purchase receipt as proof of purchase for any warranty claims.
