Characteristics of liquid ammonia flow measurement
Characteristics of liquid ammonia flow measurement:
①The gas-liquid interface at the liquid ammonia stored in the storage tank is generally in a gas-liquid equilibrium state.Liquid ammonia flow measurement should try to avoid two-phase flow. However, liquid ammonia close to the gas-liquid equilibrium state, if the pressure loss is large when flowing through the flow, it is easy to cause partial vaporization, which affects the measurement accuracy.
①The gas-liquid interface at the liquid ammonia stored in the storage tank is generally in a gas-liquid equilibrium state.Liquid ammonia flow measurement should try to avoid two-phase flow. However, liquid ammonia close to the gas-liquid equilibrium state, if the pressure loss is large when flowing through the flow, it is easy to cause partial vaporization, which affects the measurement accuracy.
②The temperature coefficient of liquid density is large.
From the ρ=f(t) function table of liquid ammonia, it can be seen that under normal temperature conditions, the density of the liquid ammonia changes by 0.2 ° C or more for every 1 ° C change. Therefore, liquid ammonia metering must be temperature compensated.
③High precision requirements.
Liquid ammonia metering should achieve level 1 accuracy.
④The fluid is flammable and explosive.
Explosion-proof instruments should be used when selecting the instrument.
⑤The measured medium is corrosive.
From the ρ=f(t) function table of liquid ammonia, it can be seen that under normal temperature conditions, the density of the liquid ammonia changes by 0.2 ° C or more for every 1 ° C change. Therefore, liquid ammonia metering must be temperature compensated.
③High precision requirements.
Liquid ammonia metering should achieve level 1 accuracy.
④The fluid is flammable and explosive.
Explosion-proof instruments should be used when selecting the instrument.
⑤The measured medium is corrosive.
Ammonia has a strong corrosive effect on materials such as copper. Therefore, the part of the instrument that is in direct contact with the measured medium should be resistant to ammonia corrosion.
Welcome to visit our website for more information: www.aft-flowmeter.com
评论
发表评论