Vacuum Generation and Measurement

The goal of generating a «Vacuum» inside a Refrigerant Circuit is partly to reduce the total internal pressure, but is mainly to eliminate the Condensable Gases such as water vapour contained inside. Polo’s vast experience with vacuum generation has given rise to a robust series of Instruments and Accessories
specifically designed and dedicated to the needs of the Refrigeration World.

For Vacuum Measurement, Polo produces a dedicated Pirani sensor, specifically designed for the Refrigeration Industry, with very high accuracy and robustness, including a fine mesh synterezed inlet filter to prevent possible oil vapour or impurities from affecting the life and precision of the filament. The Pirani Sensor is available in two versions:
the standard model, able to measure vacuum via the related Polo instrument model VM202, and the Active Type version, having electronic control onboard and providing an output signal of 0-10V (TA100).

The active version TA100 is also available with an RF connection (TA100RF) based on 2,4 GHz with 16 Channels, ideal for Pre-Vacuum Carousels common with Domestic Refrigerator production lines. The highly innovative solution of the TA100RF also provides the possibility of tracing the evacuation cycle data during the production phase of the refrigerators, which is very important to the quality and efficiency of the final product.

For other applications a more classic digital instrument (VM202 model) is available, having a large LCD display and Double Red/Green LED’s to indicate the status of the programmable High/Low pressure Set-points. The vacuum pumping groups are available as components only (solution for carousels) or assembled on a cart (solution for Vacuum Stand Alone Station); the cart solution can also include automatic vacuum cycles by PLC logic control. Polo also supplies a complete series of Accessories such as Oil Mist Filters for the Vacuum Pumps, the Inlet Condensate Separators and the Flexible Pipes with Quick Release Ports for the connection to the refrigeration circuits.

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