Introduction
The Super Stars Digital Micron Vacuum Gauge ST-VG90 is a high-accuracy instrument designed for precise vacuum measurement in HVAC and refrigeration systems. Equipped with a professional Pirani vacuum sensor, it provides fast and accurate readings across a wide range, ensuring systems are moisture-free before refrigerant charging. This manual provides essential information for the proper setup, operation, and maintenance of your device.
Figure 1: Super Stars Digital Micron Vacuum Gauge ST-VG90.
Key Features
- High Accuracy Vacuum Measurement: Professional Pirani vacuum sensor offers fast and accurate readings from 99999 to 0.1 Pa (740000 to 0.75 micron).
- Multiple Pressure Units: Easily switch between Pa, mBar, mmHg, and Micron.
- Smart Vacuum Alarm Function: Built-in buzzer and visual alert activate upon reaching a preset vacuum level.
- Backlit LCD & Power-saving Design: Clear digital LCD screen with optional backlight and automatic power-off function.
- Durable and Pump Compatibility: Compact design with one-key calibration, suitable for vacuum pumps of 5 CFM or higher.
What's in the Box
Upon unpacking, please verify that all items listed below are present and in good condition:
- Digital Micron Vacuum Gauge (ST-VG90)
- 3 x AA Batteries
- 2 x Adapters (1/4 inch SAE)
- Storage Bag
- Instruction Manual
Figure 2: Included components: vacuum gauge, batteries, adapters, and storage bag.
Setup
- Battery Installation: Open the battery compartment on the back of the device. Insert the three AA batteries, ensuring correct polarity. Close the compartment securely.
- Adapter Connection: The gauge features a 7/16"-20UNF (1/4" SAE) connection. Attach the appropriate adapter (straight or 90-degree elbow) to the gauge's port. Ensure a tight seal to prevent leaks.
- Initial Power On: Press and hold the power button (U) to turn on the device. The LCD will illuminate, displaying the current vacuum reading.
Video 1: Unboxing and initial setup of the Super Stars Digital Micron Vacuum Gauge, demonstrating battery installation and adapter connection.
Operation
- Power On/Off: Press and hold the power button (U) to turn the gauge on or off.
- Unit Switching: Press the UNIT button to cycle through the available pressure units: Pa, mBar, mmHg, and Micron.
- Setting Alarm: Press the SET button to enter the alarm setting mode. Use the up/down arrows (often integrated with other buttons or implied by repeated presses) to adjust the desired vacuum level for the alarm. Once the preset level is reached during evacuation, the device will provide an audible and visual alert.
- Calibration: The gauge supports one-key calibration. In an open-air environment (atmospheric pressure), press and hold the SAVE CAL button to initiate calibration. The display will show "CAL" during the process. Ensure the sensor is clean and dry before calibration.
- Connecting to System: Connect the gauge (with adapter) to the vacuum pump or system port. Begin the evacuation process. Monitor the digital display for real-time vacuum readings.
Figure 3: Display showing various measurement units and range.
Figure 4: Smart Vacuum Alarm in action, indicating a preset level has been reached.
Figure 5: The gauge in use with an HVAC system.
Maintenance
- Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Sensor Care: Keep the Pirani sensor clean and free from oil or debris. Avoid direct contact with the sensor.
- Storage: Store the gauge in its provided carrying case in a cool, dry place when not in use. Remove batteries if storing for extended periods to prevent leakage.
- Battery Replacement: Replace batteries when the low battery indicator appears on the display.
Troubleshooting
- No Display/Power: Check battery installation and ensure batteries are not depleted. Replace if necessary.
- Inaccurate Readings: Perform a calibration in an open-air environment. Ensure all connections are tight and there are no leaks in the system being tested. Check the sensor for contamination.
- Alarm Not Activating: Verify that the alarm set point is correctly configured and that the vacuum level has reached or surpassed the set threshold.
Specifications
| Feature | Specification |
|---|---|
| Measuring Range | 99999 Pa - 0.1 Pa (740000 - 0.75 Micron) |
| Measurement Units | Pa, mBar, mmHg, Microns |
| Accuracy | 0.1 Pa - 1000 Pa; Reading ±5% (at 68°F) |
| Resolution | 0.1 Pa (<10 Pa); 1 Pa (<100 Pa); 10 Pa (<1000 Pa) |
| Maximum Overload Pressure | 0.5 MPa / 72 PSI |
| Working Temperature | -5 to 50°C (23 to 122°F) |
| Power Supply | 3 x AA batteries (approx. 40 hours battery life) |
| Buzzer Prompter | 90dB, shuts down after 35 seconds |
| Connection | 7/16"-20UNF (1/4" SAE) |
| Item Dimensions L x W x H | 5.43 x 2.36 x 1.1 inches |
| Item Weight | 16 ounces |
| Material | Metal |
Figure 6: Technical specifications of the ST-VG90.
Warranty and Support
Super Stars products are manufactured to high-quality standards. For warranty information, technical support, or service inquiries, please refer to the contact information provided with your purchase documentation or visit the official Super Stars website. Please retain your proof of purchase for warranty claims.