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Simpson Group
Np Simpson Pgd E 800 60bee7cf8f0b3

Gas-Pressure Measuring Device

June 8, 2021
For hot-, warm-, or cold-box and no-bake molding, samples of foundry sand are heated and gas pressure over a selected period is recorded over time.

SIMPSON GROUP’s Model PGD-E gas-pressure measuring device is used to measure, accurately, gas pressure generated over time from foundry sands. During pouring process, the cores and mold come into contact with liquid metal and are heated quickly to high temperatures. As the temperature increases, the pressure inside the core increases due to the growing volume of core gas generated.

Removing hot gases via the core structure is hindered by the mold. If the quantity of gas reaches a level where it can no longer be vented by the permeability of the sand, the gas can be forced into the liquid metal and cause defects in the casting (e.g., porosity).

Thus, the impact of the core gas on the casting between the start of pouring and solidification, generation time is an important variable. To avoid casting defects, measuring gas pressure and determining the generation time is important to successful metalcasting.

The Model PGD-E gas-pressure measuring system includes a measuring tube and attached plug coupling, measuring tube, spiral hose, plug couplings, quartz glass tubes, glass funnel, test glass brush, sample holder, quartz glass tube support, monitor cable (COM Cable), ADS16DAN software, and carrying case. Learn more at