Agilent Presision gas flow meter 5067-0223

Description: Agilent electronic flowmeter 5067-0223 The Agilent Precision gas flow meter is based on the accurate measurement of volumetric flow. The volumetric flow rate is determined by creating a pressure drop across a unique internal restriction, known as a laminar flow element (LFE), and measuring differential pressure across it. The restriction is designed so that the gas molecules are forced to move in parallel paths along the entire length of the passage; hence, laminar (streamline) flow is established for the entire range of operation of the meter. Unlike other flow measuring meters, in laminar flow meters the relationship between pressure drop and flow is linear. The underlying principle of operation of the Agilent Precision gas flow meter is known as the Poiseuille Equation: Q = (P1 – P2) πr4/8ηL (Equation 1) Where: Q = Volumetric flow rate P1 = Static pressure at the inlet P2 = Static pressure at the outlet r = Radius of the restriction η = (eta) absolute viscosity of the fluid L = Length of the restriction Since π, r, and L are constant, Equation 1 can be rewritten as: Q = K (ΔP/η) (Equation 2) Where K is a constant factor determined by the geometry of the restriction. Equation 2 shows the linear relationship between volumetric flow rate (Q), differential pressure (ΔP), and absolute viscosity (η) in a simpler form. Gas viscosity In order to get an accurate volumetric flow rate, the gas being measured must be selected (see the Gas Select Mode section in the Operating Manual for more information). This is important because the meter calculates the flow rate based on the viscosity of the gas at the measured temperature. If the gas being measured is not what is selected, an incorrect value for the viscosity of the gas will be used in the calculation of flow, and the resulting output will be inaccurate in direct proportion to the ratio between the two gases’ viscosities. Gas viscosity, and thus gas composition, can be very important to the meter’s accuracy. Anything that has an effect on the gas viscosity (for example, water vapor, odorant additives, etc.) will have a direct proportional effect on the meter’s accuracy. Selecting methane and measuring natural gas, for instance, will result in a fairly decent reading, but it is not highly accurate (errors are typically < .6%) because natural gas contains small and varying amounts of other gases, such as butane and propane, that result in a viscosity that is somewhat different than that of pure methane. Absolute viscosity changes very little with pressure (within the operating range of this meter); therefore, a true volumetric reading does not require a correction for pressure. Changes in gas temperature do affect viscosity. For this reason, the Agilent Precision gas flow meter internally compensates for this change. It is removed out from working environment . Used item without any other accessories , no power adapter and no cables. There are many scuffs /scratches on it. As the pictures show

Price: 749.99 USD

Location: P.R.China

End Time: 2025-01-20T03:54:09.000Z

Shipping Cost: 48 USD