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Diaphragm pressure gauge, also known as a membrane pressure gauge, is a device that utilizes the deflection of a flexible thin membrane called the ‘diaphragm’ to measure the pressure of the fluid in a system. The membrane isolates the inner-working components of the pressure gauge from the media, preventing any contamination. This property makes the diaphragm pressure gauge suitable to use with corrosive or contaminated liquid or gaseous media.
This pressure gauge is utilized for low-pressure measurement and is used in applications such as measuring atmospheric pressure or monitoring pressure in a gas canister.
Gauge Material: The housing material of the gauge and especially the parts coming in contact with the media should be chemically compatible. Since the diaphragm pressure gauge is mostly used with corrosive as well as highly viscous media, stainless steel is the preferred choice of material. Other common housing material includes aluminum and copper. See our Chemical Compatibility Chart for more detail on material compatibility.
Pressure ranges: A diaphragm pressure gauge is an ideal choice for low-pressure measurement applications. For general applications, the pressure gauge must be able to withstand the maximum and minimum pressure ranges. The maximum pressure should not be greater than 75% of the full-scale range and 65% for the pulsating range.
Temperature range: The temperature requirement of the application should be within the temperature limits that the pressure gauge can withstand. Typical diaphragm pressure gauges can withstand the temperature range of -20°C to 100°C (-4°F to 212°F), but look at the specifications.
Diaphragm size: In the selection of diaphragm size, the general rule of thumb is, lower the pressure, the larger the diaphragm size, and vice versa. During pressure measurement, the diaphragm should be big enough to displace a sufficient amount of fluid volume. For low-pressure measurement, larger volume displacement is required which requires a larger diaphragm to create sufficient displacement. Similarly, for high-pressure measurement, low volume displacement is usually enough, which can be fulfilled by a smaller diaphragm.
Fluid media: Unlike other vicious media, crystallizing and contaminated media may clog the narrow pressure entry point or even at the pressure chamber. To avoid such risk, a diaphragm pressure gauge with an open connection flange can be used to eliminate clog problems.
Pressure unit: The pressure measure unit for the diaphragm pressure gauge is bar or psi. The pressure may usually range from -1 to 400 bar.
Diaphragm pressure gauge, also known as a membrane pressure gauge, is a device that utilizes the deflection of a flexible thin membrane called the ‘diaphragm’ to measure the pressure of the fluid in a system. The membrane isolates the inner-working components of the pressure gauge from the media, preventing any contamination. This property makes the diaphragm pressure gauge suitable to use with corrosive or contaminated liquid or gaseous media.
This pressure gauge is utilized for low-pressure measurement and is used in applications such as measuring atmospheric pressure or monitoring pressure in a gas canister.
Gauge Material: The housing material of the gauge and especially the parts coming in contact with the media should be chemically compatible. Since the diaphragm pressure gauge is mostly used with corrosive as well as highly viscous media, stainless steel is the preferred choice of material. Other common housing material includes aluminum and copper. See our Chemical Compatibility Chart for more detail on material compatibility.
Pressure ranges: A diaphragm pressure gauge is an ideal choice for low-pressure measurement applications. For general applications, the pressure gauge must be able to withstand the maximum and minimum pressure ranges. The maximum pressure should not be greater than 75% of the full-scale range and 65% for the pulsating range.
Temperature range: The temperature requirement of the application should be within the temperature limits that the pressure gauge can withstand. Typical diaphragm pressure gauges can withstand the temperature range of -20°C to 100°C (-4°F to 212°F), but look at the specifications.
Diaphragm size: In the selection of diaphragm size, the general rule of thumb is, lower the pressure, the larger the diaphragm size, and vice versa. During pressure measurement, the diaphragm should be big enough to displace a sufficient amount of fluid volume. For low-pressure measurement, larger volume displacement is required which requires a larger diaphragm to create sufficient displacement. Similarly, for high-pressure measurement, low volume displacement is usually enough, which can be fulfilled by a smaller diaphragm.
Fluid media: Unlike other vicious media, crystallizing and contaminated media may clog the narrow pressure entry point or even at the pressure chamber. To avoid such risk, a diaphragm pressure gauge with an open connection flange can be used to eliminate clog problems.
Pressure unit: The pressure measure unit for the diaphragm pressure gauge is bar or psi. The pressure may usually range from -1 to 400 bar.
