The HITELFI is a multiport self-averaging flow meter with a design based on the classical pitot tube concept of fluid flow measurement. In accordance with the rule of constant energy the kinetic energy of this stream line is converted to potential(pressure) energy. This causes an in crease in pressure at the point of fluid stoppage. At a second sensing point where a stoppage of the flow lines will be avoided, the static pressure within the pipe is obtained. The pressure difference will be determined by directing the high pressure to the + – side of a Ʌp-transmitter and the low pressure to its–side. This differential pressure is proportional to the square of the flow velocity and depends on the density of the medium. The HITELFI deviates from the “pure doctrine” of the pitot tube because the low pressure is less than the static pressure. Compared with the pitostatic tube the HITELFI produces a larger differential pressure at the same flow velocity. This difference will be compensated for by a correction factor, the so-called “k-factor”.
APPLICATION
FEATURES
– Unique profile shape enables high flow rate turndown Dual aberaging for better accuracy
– One-piece outer tube for optimum strength
– Suitable for pipe sizes from 50mm to 5000mm Suitable for square or rectangular section ducts • Optional direct mounting transmitter arrangement
– No co-efficient drift – long term stability
– Low blockage characteristic means low energy consumption – hence cost savings
SPECIFICATION
– HITELFI is suitable for liquid, gas, and steam flow measurement
– Accuracy ±1% of actual flow rate-verified by independent flow laboratories Repeatability of measurement ±0.1%
– Reynolds number. Minimum Re: 1.2X104
– Flow rate turndown typically 10:1 (100:1 of DP)
– Maximum working pressure up to 400 bar
– Maximum working temperature up to 1300 deg. C with selected materials and fittings
– Maximum viscosity 500 centipoise
– Short upstream and downstream straight pipe lengths
– Long term accuracy unaffected by wear
