Imperial-Thermal 14571/4501 Vacuum Gauge

For proper evacuation and dehydration of refrigeration and air-conditioning systems, an electronic vacuum gauge is an indispensable companion to a vacuum pump. Significant dehydration does not occur until a vacuum of 1000 microns or greater has been achieved. Use of electronic vacuum gauges is the only way to determine when dehydration is occurring and when it is complete.

Imperial-Thermal Engineering Vak-Checks are precision thermistor vacuum gauges designed especially for refrigeration and air-conditioning service. They automatically compensate for changes in ambient temperature and permit continuous monitoring during evacuation. These instruments are compact, lightweight, easy to use, and read directly in microns on a large easy-to-read meter.

4501 Battery-Only Thermistor Vacuum Gauge


  • Atmoshere to 10 microns.
  • Ambient temperature compensated.
  • Accuracy: 200-1000 microns: ±5%.
  • Comes complete with Model 4510 Sensor.
  • Battery powered, no searching for outlets (2 “D” cell batteries not included).
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14571 Dual Power Thermistor Vacuum Gauge

This analog thermistor vacuum gauge allows you to choose between 110AC and battery as your power source with the same features as the Model 4501.


  • AC/battery operated.
  • Range: Atmosphere to 10 microns.
  • Ambient temperature compensated.
  • Complete with Model 4510 Sensor.
  • Accuracy: 200-1000 microns ±5%.
  • Power: 110AC or 2 “D” cell batteries (Batteries not included).

4510 Replacement Vacuum Sensor


  • Vacuum-tight construction
  • Vacuum Sensor for model 4501 and 14571.
  • 0 to 50 calibration scale.
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Overview Of Model 14571 & 4501

Maintenance & Troubleshooting Of Model 14571 & 4501

Product Tags: Vak-Check