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  User's Manual
Product Flyer
Package Art
Features and Benefits
Competitive Advantages
What's Included?
Recommended
Specifications
What is It?
The Fieldpiece Digital Vacuum Gauge Accessory, model AVG2, is a thermistor based digital multimeter accessory that digitally measures a vacuum of 50 to 2000 microns and converts that reading into millivolts DC on your compatible DMM or our electronic handle and data logger. LEDs provide a pump down indicator showing progress from atmospheric pressure. The sensor has been designed to withstand pressures up to 500 psi (3400kPa) so that no damage to the AVG2 will occur if it is exposed to full system pressures.
How Does it Work?
Power is delivered to a thermistor which is exposed to the vacuum being tested. Molecules from the gas conduct heat from the thermistor. The fewer gas molecules there are, the less heat is taken away. The power to the resistor is adjusted to keep the temperature of the thermistor within a narrow range. The lower the power required by the resistor, the lower the pressure. The power delivered to the thermistor is measured and scaled to pressure. It is very important that the thermistor sensor be kept clean and free of oil to enable unimpeded flow of heat from the thermistor.
Applications
Measure the vacuum on a refrigeration system when evacuating refrigerant. The digital readout shows even small drops in pressure. While target vacuum pressures vary, the technician typically wants a vacuum between 300 and 400 microns for small systems and 700 for large systems.
LED Indicators
INC: When the pressure is increasing, the LED blinks at a rate relative to the rate of pressure increase.
DEC: When the pressure is decreasing, the LED blinks at a rate relative to the rate of pressure decrease.
STABLE: When the rate of change of pressure is zero, the LED will light.
ON: When the AVG2 is on, the LED will light.
LO BAT: When the batteries need replacement, the LED will light.
Operation
- Connect AVG2 vacuum gauge head to VOLTS/OHMS and COM jacks on meter and select mVDC. Slide onto “Stick” meter, EHDL1 Electronic Handle or DL3 Data Logger. You can also connect to meters with a mVDC scale and industry standard jacks by using ADLS2 test leads or AHDL1 Adapter Handle.
- Hand tighten your service hose from the refrigeration/ AC system service port to the AVG2.
- Your meter will readout pressure in microns of mercury. Disable auto-off for long evacuations or for data logging with the DL3.
- To view the pressure dropping from atmospheric pressure to 2000 microns, set DMM to VDC range. Once reading is below 2.0, change range to mVDC to display pressure in microns.
Features and Benefits
Designed for HVAC/R, the Digital Vacuum Gauge Accessory, model AVG2, gives technicians an accurate results in a compact design. Other features and benefits include:
- Displays pressure in microns in steps of 1 micron.
- Range: 50 to 2000 microns of mercury.
- Resolution: 1 micron of mercury.
- Pump down indication: when pumping down from atmospheric pressure to 2000 microns, output of head goes from over 3VDC to 2VDC.
- Straight-in access to sensor for easy cleaning.
- Fitting: 1/4" flared brass fitting (male)
- Accuracy (@~75ºF): ±10%, 0-1000 microns of mercury
- Auto-off can be disabled for data logging.
- "T" for inline vacuum testing.
Competitive Advantages
Like all Fieldpiece accessories, the AVG2 allows you to do more work from one small bag of tools. The AVG2 features all of the benefits of standalone vacuum gauges in a compact design, plus it gives you the option of direct measurement or data logging using Fieldpiece modular meters.
What's Included
- Digital Vacuum Gauge Accessory - AVG2
- 9V battery (installed)
- Operator’s manual
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Recommended Accessories and Replacement Parts
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Expandable True RMS Stick Multimeter with Backlight - HS36
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Superheat and Subcooling for A/C and Refrigeration - SSX34
The Fieldpiece Superheat and Subcooling for Air Conditioning and Refrigeration meter, model SSX34, measures suction line, or low side, line temperature and pressure. It then calculates actual superheat in real time using built-in P/T charts. It also measures liquid line, or high side, temperature and pressure, and calculates actual subcooling. Use it to get actual superheat on R-22, R-410A, R-134A, and R-404A fixed orifice systems and actual subcooling on TXV / TEV regulated systems. Use the “T” fitting to charge to actual superheat or subcooling by putting the SSX34 in-line between your refrigerant bottle and the system.
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Specifications
TECHNICAL SPECIFICATIONS
Sensor: Precision thermistor
Fitting: Standard 1/4” flared brass fitting (male)
Conversion rate: 1 mVDC/1 micron of mercury
Range: 50 to 2000 microns of mercury
Resolution: 1 micron of mercury
Accuracy: +/-10% or +/-10 microns, (50 to 1000 microns) @ 73°F ±9°F (23°C ±5°C), <90%RH.
Operating environment: 32 to 122°F (0 to 50°C) @ <75%RH
Storage environment: -4 to 140°F (-20 to 60°C) @ <80%RH with battery removed
Pump down indication: When pumping down from atmospheric pressure to 2000 microns, output of head goes from over 3VDC to 2VDC.
Overload: 500psi (3400kPa)
Battery: 9V
Battery life: 35 to 40 hours typical (alkaline). Red LED indicates battery is below operating level.
Auto-off: To extend battery life, the AVG2 automatically turns off after 5 minutes when reading above 70,000 microns. The auto-off switch is located beneath the rubber covering. Use it to disable auto-off function.
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