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1. Intrinsic safety pressure transmitter
2. What does temperature and pressure compensation mean in instrumentation?
Temperature and pressure compensation usually refers to the data measured by instruments under the conditions of a temperature of 25 degrees and a pressure of one standard atmospheric pressure. Usually, the temperature and pressure measured on site are different from the standard, so general instruments can measure the temperature and pressure on site, and then automatically compensate for the measurement results through calculation formulas.. For example, in the measurement of air flow, flow meters such as orifice plate flow meters, double D-bar flow meters, and pin cover Annubar flow meters generally measure the volumetric flow rate at the current temperature and pressure. However, when the volume of air is constant, its mass is greatly affected by temperature and pressure. The calculation formula is PV=NRT=>m=MPV/RT Ideal Gas State Equation, where R is a constant, approximately 8.314 J/(mol · K); P is the gas pressure, measured in Pa; M is the molar mass of the substance (or the average molar mass of the mixed gas); V is the volume of the gas, measured in m3; T is the system temperature, measured in K. For approximate calculation, the temperature is assumed to be at room temperature of 20 ℃ (293K), and the gas approximates ideal gas dispersion. The air quality is m=29g/mol × 101325Pa × 1m ³ ÷ 8.314J/(mol · K) ÷ 293.15K=1205.63g=1.2kg. From the formula, it can be seen that there is a great relationship between air quality and temperature pressure. Therefore, when measuring with instruments, the temperature and pressure on site should be measured first and then automatically compe
1. Mass flow compensation formula: If the volume flow rate under known operating conditions is \ (Q_1 \), the volume flow rate under standard conditions needs to be calculated as \ (Q-0 \) or the mass flow rate as \ (M \): • Standard volume flow calculation formula: \ [Q-0=Q_1 \ sqrt {\ frac {P_1 T0} {P_0 T1}} \], where: - \ (Q-0 \): Volume flow rate under standard conditions (unit: m ³/h); -(Q_1): Volume flow rate under operating conditions (unit: m ³/h); -(P_0): Standard absolute pressure (usually 101.325 kPa); -\ (P_1 \): Absolute pressure under working conditions (unit: kPa); -(T0): Standard thermodynamic temperature (usually taken as 293.15 K, i.e. 20 ° C); -(T1): thermodynamic temperature under operating conditions (unit: K), calculated using the formula (T1=t1+273.15) (where t1 is the Celsius temperature under operating conditions). • Mass flow calculation formula: \ [M=\ rho-0 Q-0=\ rho-0 Q_1 \ sqrt {\ frac {P_1 T0} {P_0 T1}} \], where - \ (M \): Mass flow rate (unit: kg/h); -(\ rho-0 \): Gas density under standard conditions (unit: kg/m ³)
2. Differential pressure compensation formula For differential pressure orifice flow meters, the flow rate is proportional to the square root of the differential pressure, and the t
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