CPS Products VG200 Digital Vacuum Gauge
Updated June 19, 2026
The CPS VG200 is a handheld digital vacuum gauge designed for precision measurement of deep vacuum levels in HVAC and automotive air conditioning systems. It displays readings in microns on a large 5-digit LCD, making it essential for verifying proper evacuation before charging a system. The gauge is NIST calibrated, features automatic temperature compensation, and includes a cleanable sensor that withstands up to 400 PSI without damage.
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How It Works and Key Features
The VG200 uses a solid-state sensor to measure absolute pressure in microns (µmHg). A simple two-button interface lets users select units (microns, millibar, Torr, etc.). The gauge runs for up to 30 hours on a single 9V alkaline battery, with a low-battery indicator and auto-off to conserve power. Its sensor is protected against overpressure up to 400 PSI, and automatic temperature compensation ensures accuracy across varying ambient conditions. The included brass adapter (AVT45) and hanging hook make it easy to connect and position during service.
Compatible Systems and Applications
This gauge is primarily used in HVAC/R (heating, ventilation, air conditioning, and refrigeration) and automotive A/C service. It connects to the vacuum pump and the system being evacuated, allowing technicians to monitor the depth of vacuum in real time. It is suitable for residential, commercial, and automotive systems that require a deep vacuum (typically below 500 microns) to remove moisture and non-condensables. The VG200 is a standard tool for professional A/C technicians and is compatible with most 1/4-inch flare or Schrader valve fittings.
Common Failure Symptoms and Diagnosis
A failing or inaccurate vacuum gauge can lead to incomplete system evacuation, resulting in poor cooling performance, compressor damage, or moisture contamination. Symptoms of a faulty VG200 include erratic readings, failure to zero, or a sensor that does not respond to vacuum changes. The gauge's sensor is cleanable, but if it becomes contaminated with oil or debris, readings may drift. The low-battery indicator should be heeded; a weak battery can cause inaccurate measurements. If the display remains blank, check the battery and connections.
Installation and Usage Notes
To use, install a fresh 9V battery, connect the gauge to the vacuum pump or system via the included adapter, and power on. Allow the gauge to stabilize at atmospheric pressure (it should read near 0 microns if properly zeroed). During evacuation, the reading will drop; a target of 500 microns or lower is typical for a dry system. After reaching target, isolate the pump and watch for rise – a rapid rise indicates a leak. The gauge should be stored in its padded case when not in use. Calibration should be checked periodically per manufacturer recommendations.
