This Classical period saw the annexation of much of modern-day Greece by the Persian Empire, its subsequent independence, and it also had a powerful influence on the Roman Empire and greatly influenced the foundations of western civilization.his Classical period saw the annexation of much of modern-day Greece by the Persian Empire, its subsequent independence, and it also had a powerful influence on the Roman Empire and greatly influenced the foundations of western civilization.
Dwyer Series A3000 PhotohelicÂ® Pressure Switch/Gauge. PhotohelicÂ® Switch/Gages function as versatile, highly repeatable pressure switches combined with a precise pressure gage employing the time-proven Magnehelic Â® gage design. The PhotohelicÂ® gage measures and controls positive, negative or differential pressures of air and compatible gases. Standard models are rated to 25 psig (1.7 bar) with options to 35 (2.4) or 80 (5.5 bar) psig. Single pressure 36000S models measure to 6000 psig (413 bar) with a 9000 psig (620 bar) rating.
Starting at just $55, these gauges certainly give a lot more value for money. Applications of the Magnehelic Gauge. There are various applications where there are needs for an accurate pressure reading. Magnehelic gauges are commonly used in HVAC applications; they are used to measure fan and blower pressures.They can also tell whether the air filters need replacement or not.his is the main difference that magnehelic differential pressure gauges have over the other gauges that use mechanical means to transmit the readings. This lack of physical contact between the parts mean that there is no wear inside the system that can affect the instrumentâs accuracy in any way.