High Vacuum Gauges
To measure the depth ("high"), vacuum, electronic or solid-state thermistor sensor vacuum is used. A regular connection of the sensor cannot be read micron levels. Vacuum from 29.25" Hg (about 17 000 microns) to 29.9" Hg (540 mcm)is necessary to allow the moisture inside the system evaporates at room temperature. Inside design of the vacuum tube used on electronic mechanism. The sensor element thermocouple. It is important to use the tube upright to keep out foreign substances.
Thread becomes warmer, as the air pressure around him. (There are fewer molecules of air to disperse heat.) Thermocouple becomes warmer and increase emf, registered on the meter. Counter measured in microns.
If the vacuum gauge reading is stabilized 5000 microns, or ice free water in the system. Ice can be on a cold place, frost, or sweat on the outside of the system. Stop the pump and allow the ice to melt, or use of radiant heat. Never let the pressure in the system to enter high vacuum gauge. Ice or free water will damage the sensor.
Thermocouple vacuum sensor consists of two parts, the indicator and the tube, which flows into the refrigeration system.
The handset has to be right-side-streams down. Tube sometimes collects vapors and/or oil. It could be cleaned by affixing a solvent in the opening of a pipette. R-23 a good vacuum cleaner. Clean as follows:
- Fill in.
- Rock-tube gently.
- Empty.
- Repeat Steps 1-3 two or three times.
- Pure alcohol rinse.
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Industrial