1. Introducción
The UNI-T A56 BT and A57 BT are advanced temperature and humidity dataloggers designed for precise environmental monitoring. These devices feature a large data storage capacity of 64,000 sets, Bluetooth connectivity for seamless communication with PC and mobile applications, and robust IP54 protection. They are ideal for various applications requiring accurate and reliable temperature and humidity data logging, such as food processing, cold-chain transportation, and warehouse monitoring.
2. Características principales
- Alta precisión: Measures temperature with an accuracy of ±0.3°C and humidity with ±2.5%RH.
- Large Data Storage: Capable of storing up to 64,000 sets of temperature and humidity data.
- Conectividad Bluetooth: Enables wireless data transfer and configuration via Bluetooth to a mobile application (TempLink) or PC analysis software.
- Audible and Visible Alarm: Provides alerts for out-of-limit temperature and humidity conditions.
- Protección IP54: Offers protection against dust and splashing water, suitable for various environments.
- Magnetic Wall-Mounted Design: Allows for flexible and secure placement.
- Adjustable Record Interval: Logging intervals can be set from 10 seconds to 24 hours.
- Soporte multi-idioma: User interface available in English, French, German, Italian, Spanish, Swedish, Polish, and Czech.
- Batería de larga duración: Powered by a single-use Li-ion battery (3.6V 2700mAh ER14505) with up to 2 years of life (room temperature, 15min record interval).

Figura 2.1: Sobreview of UNI-T A56 BT Datalogger key features including Bluetooth APP, 64000 Data Storage, High Accuracy, PC Analysis Software, Audible and Visible Alarm, and Waterproof Dustproof (IP54).

Figure 2.2: Detailed features including simultaneous large-screen display, wide measurement range (-40°C to 85°C), adjustable record interval, over-limit alarm, and magnetic wall-mounted design.
3. Configuración
3.1. Inspección inicial
Upon unpacking, verify that all components are present and undamaged. The package typically includes the A56 BT datalogger, a gift box, a quick start guide, a safety instruction, download operation guide, battery, wall-mounted screws*2, expandable rubber plug*2, and a USB cable.
3.2. Instalación de la batería
The datalogger uses a single-use Li-ion battery (3.6V 2700mAh ER14505). Refer to the quick start guide for specific instructions on how to open the battery compartment and correctly insert the battery. Ensure proper polarity.
3.3. Instalación del software
Download the UNI-T TempLink mobile application from your device's app store or the PC analysis software from the official UNI-T webSitio. Siga las instrucciones en pantalla para la instalación.
3.4. Montaje del registrador de datos
The A56 BT features a magnetic wall-mounted design. Choose a suitable location for monitoring, ensuring it is within Bluetooth range of your control device if wireless operation is desired. Use the provided screws and plugs for secure wall mounting if needed.

Figura 3.1: Frente view of the A56 BT Datalogger, displaying current temperature and humidity readings.
4. Instrucciones de funcionamiento
4.1. Conexión vía Bluetooth
- Ensure Bluetooth is enabled on your smartphone or PC.
- Open the TempLink app or PC software. The software will automatically search for nearby A56 BT/A57 BT dataloggers.
- Select your datalogger from the list of discovered devices to establish a connection.
4.2. Configuring Logging Parameters
Using the TempLink app or PC software, you can configure various logging parameters:
- Intervalo de registro: Set how frequently data is recorded (e.g., 10s, 1min, 1h).
- Umbrales de alarma: Define upper and lower limits for temperature and humidity to trigger audible and visual alarms.
- Start/Stop Logging: Initiate or terminate data recording.
- Selección de unidad: Choose between °C and °F for temperature display.
4.3. Inicio y detención del registro de datos
Once configured, you can start logging directly from the app/software. The datalogger will begin recording data at the specified interval. To stop logging, use the corresponding function in the application.
4.4. Data Retrieval and Analysis
After logging, connect the datalogger to the TempLink app or PC software. You can then download the recorded data. The software allows for graphical analysis of the data and export into various formats such as XLSX (Excel), CSV, or TXT for further processing.

Figure 4.1: Illustration of the datalogger's capabilities, including 64000 data storage, Bluetooth APP and PC software support, and automatic generation of multiple report forms (PDF, CSV).
5. Mantenimiento
5.1. Reemplazo de la batería
When the battery indicator on the display shows low power, replace the battery promptly to ensure continuous operation and data integrity. Use only the specified battery type (3.6V 2700mAh ER14505 Li-ion battery).
5.2. Limpieza
Wipe the datalogger with a soft, dry cloth. Do not use abrasive cleaners or solvents. While the device has IP54 protection, avoid submerging it in water or exposing it to excessive moisture.
5.3. Almacenamiento
Store the datalogger in a cool, dry place away from direct sunlight and extreme temperatures when not in use for extended periods. Remove the battery if storing for several months to prevent leakage.
6. Solución de problemas
- El dispositivo no se conecta a través de Bluetooth: Ensure the datalogger is powered on and within range (up to 100 feet). Check that Bluetooth is enabled on your smartphone or PC. Restart both the datalogger and the application.
- Lecturas inexactas: Verify that the datalogger is placed in an environment free from direct heat sources, strong air currents, or excessive moisture that could affect sensor performance. Ensure the sensor opening is not obstructed.
- Data logging not starting: Confirm that logging parameters have been correctly configured and the 'Start' command has been issued through the application. Check battery level.
- La pantalla no funciona: Check the battery level and replace if necessary. If the issue persists, contact customer support.
7. Especificaciones

Figure 7.1: Detailed table of functions, ranges, accuracy, and other characteristics of the A56 BT Datalogger.
| Característica | Especificación |
|---|---|
| Modelo del producto | YH-A56 BT |
| Rango de temperatura | -40 °C ~ 85 °C (-40 °F ~ 185 °F) |
| Precisión de temperatura | ±0.3°C (0°C < t ≤ 60°C) |
| Rango de humedad | 0% ~ 100% de humedad relativa |
| Precisión de humedad | ±2.5%RH (0% ≤ RH ≤ 90%) |
| Capacidad de grabación | 64,000 juegos |
| Intervalo de registro | 10s ~ 24h (Adjustable via App/PC) |
| Conectividad | Bluetooth APP (TempLink), PC Analysis Software |
| Alarma | Audible and Visible |
| Clasificación de protección | IP54 |
| Tipo de batería | Single-use Li-SOCl2 Battery 3.6V 2700mAh (ER14505) |
| Tiempo de trabajo | 2 years (Room temperature, 15min record interval, screen off, indicators/Bluetooth off) |
| Montaje | Montaje trasero magnético o en pared |
| Tamaño del producto | 104 x 62 x 25 mm |
| Peso neto del producto | Aproximadamente 110 g |
| Dimensiones del producto | 6.5 x 4.33 x 4.72 pulgadas |
| Peso del artículo | 2.2 libras (aprox. 1 kg) |
| Fabricante | UNI-Trend |
8. Garantía y soporte
Warranty information for the UNI-T A56 BT/A57 BT Temperature Humidity Datalogger is typically provided with the product packaging or available on the official UNI-T webSitio. Consulte estos recursos para conocer los términos y condiciones detallados de la garantía.
For technical support, product inquiries, or service, please visit the official UNI-T website or contact their customer service department through the contact information provided in your product documentation.





