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PSIG is psi Gauge, i.e. does not include air pressure. PSID is psi differential, checks for delta-P across things like filters, pumps, etc.

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PSIG stands for pounds per square inch gauge and measures pressure relative to atmospheric pressure, while PSID stands for pounds per square inch differential and measures the pressure difference between two points. PSIG is commonly used in pressure measurement devices, while PSID is often used in differential pressure devices like flow meters or filters.

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10mo ago
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Q: What is the difference between psig and psid?
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