Introduction
The Testo 552 is a highly precise digital vacuum gauge designed for monitoring the evacuation of air conditioning, refrigeration, and heat pump systems. Utilizing optimized Pirani sensors, it provides accurate deep vacuum measurements down to single-digit resolutions. Its robust design and Bluetooth connectivity enhance efficiency and reliability in the field, allowing for seamless data analysis and reporting via the Testo Smart Probes App.
Figure 1: Front view of the Testo 552 Digital Vacuum Gauge.
Key Features
- Efficient Vacuum Monitoring: Monitors HVAC and heat pump system evacuation dynamically with optimized Pirani sensors for deep vacuum measurements.
- Versatile Measurement Capabilities: Equipped with features for precise, comprehensive vacuum measurements down to single-digit resolutions.
- Time-Saving Real-Time Calculations: Determines micron/temperature levels and provides notifications upon reaching the evacuation target.
- Smart Connectivity: Communicates with smartphones or tablets via Bluetooth for reliable, precise analyses and reports that can be forwarded via email.
- Testo Smart Probes App: A free app for Android and iOS to read, log measurements, and create custom reports.
Setup
Before initial use, ensure the Testo 552 is properly prepared and connected to your system. The device requires 2 x AA batteries for operation. Connect the gauge to the system using appropriate hoses and adapters.
Connecting the Gauge
- Identify the 7/16" UNF connections on the Testo 552.
- Attach the appropriate vacuum hoses to these connections. Ensure a tight seal to prevent leaks.
- Connect the other end of the hoses to your refrigeration or HVAC system's service ports.
Figure 2: Testo 552 connected to an HVAC system for vacuum measurement.
Battery Installation
The Testo 552 operates on 2 x AA batteries, providing approximately 50 hours of battery life without Bluetooth or backlighting. Refer to the back of the device for the battery compartment.
Figure 3: Rear view of the Testo 552, highlighting the battery compartment and hook.
Operating Instructions
The Testo 552 is designed for intuitive operation. Follow these steps for accurate vacuum measurements and system evacuation.
Basic Operation
- Press the power button (Ι) to turn on the device.
- Ensure the gauge is connected to the system as described in the Setup section.
- Initiate the vacuum pump. The Testo 552 will display the current vacuum level in microns, mbar, or other selectable units.
- Monitor the display for real-time vacuum readings. The device will provide notifications when the target vacuum level is achieved.
- Use the 'set' button to configure measurement parameters or target values.
- The backlight button (☀) can be used to illuminate the display in low-light conditions.
Figure 4: Operating the Testo 552 Digital Vacuum Gauge in the field.
Bluetooth Connectivity and App Usage
The Testo 552 features Bluetooth 4.0 for seamless integration with the free Testo Smart Probes App (available for iOS 8.3+ and Android 4.3+). This allows for advanced monitoring, data logging, and report generation.
- Download and install the "Testo Smart Probes App" from your device's app store.
- Enable Bluetooth on your smartphone or tablet.
- Open the Testo Smart Probes App and follow the on-screen instructions to pair with your Testo 552.
- Once connected, you can view real-time measurements, track trends, and generate professional reports directly from your mobile device.
Evacuation Procedure Demonstration
Watch this official video from Testo Inc. US demonstrating the evacuation of a refrigeration system using the Testo 552.
Video 1: Evacuation of a refrigeration system using the Testo 552. This video demonstrates the proper connection and use of the Testo 552 with a vacuum pump and manifold to achieve a deep vacuum, ensuring the system is free of moisture and non-condensable gases.
Maintenance
The Testo 552 is designed with a maintenance-free Pirani sensor, minimizing the need for regular sensor cleaning or calibration. However, proper care of the device is essential for its longevity and accuracy.
- Cleaning: Wipe the device with a damp cloth. Do not use abrasive cleaners or solvents.
- Storage: Store the device in a dry, clean environment within the specified storage temperature range (-4.0° to 122.0 °F / -20 to +50 °C).
- Connections: Regularly inspect the 7/16" UNF connections for any signs of wear or damage. Ensure they are clean and free of debris before each use to maintain a proper seal.
- Battery Replacement: Replace batteries when the low battery indicator appears on the display. Use 2 x AA batteries.
Troubleshooting
If you encounter issues with your Testo 552, consider the following common troubleshooting steps:
- Inaccurate Readings:
- Check all hose connections for leaks. Even minor leaks can significantly affect vacuum readings.
- Ensure the system being evacuated is properly sealed.
- Verify that the vacuum pump is functioning correctly and capable of pulling the required vacuum level.
- Device Not Powering On:
- Check battery levels and replace if necessary.
- Ensure batteries are inserted with correct polarity.
- Bluetooth Connectivity Issues:
- Ensure Bluetooth is enabled on both the Testo 552 and your mobile device.
- Confirm that you are using the correct "Testo Smart Probes App".
- Try restarting both the Testo 552 and your mobile device.
- Ensure your mobile device meets the minimum system requirements (iOS 8.3+ or Android 4.3+ with Bluetooth 4.0).
- Slow Evacuation:
- This may indicate moisture or non-condensable gases in the system. Continue evacuation until the target micron level is stable.
- Check the vacuum pump oil and ensure it is clean and at the correct level.
Specifications
| Parameter | Value |
|---|---|
| Measuring Range | 0 to 0.39 psi; 0 to 26.66 mbar; 0 to 20000 micron |
| Accuracy | ±(10 micron + 10 % of mv) (100 to 1000 micron) |
| Resolution | 1 micron (0 to 1000 micron); 10 micron (1000 to 2000 micron); 100 micron (2000 to 5000 micron) |
| Operating Temperature | 14.0° to 122.0 °F / -10 to +50 °C |
| Storage Temperature | -4.0° to 122.0 °F / -20 to +50 °C |
| Protection Class | IP42 |
| Battery Life | 50 hrs (without Bluetooth/backlighting) |
| Battery Type | 2 x AA |
| Connection | 2 x 7/16“ UNF |
| Parameters | mbar; micron; mmHg; Torr; inHg; inH20; hPa; Pa |
| Measuring Rate | 0.5 sec |
| Weight | 18 oz. / 500 g |
| Dimensions | 6 x 4 x 2 in. / 160 x 110 x 50 mm |
| Item Model Number | 0560 5522 |
| Material | Plastic or synthetic material |
What's in the Box
- 1 x testo 552 digital vacuum / micron gauge with Bluetooth
Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the official Testo website or contact their customer service department. Keep your purchase receipt for warranty claims.
For additional resources and product information, visit the Testo Store on Amazon.
