ELIS PLZE a. s., 425/15, , Czech Republic, phone.: +420 377 517 711, fax: +420 377 517 722 Es 90678K
Pressure vs. temperature classes of flanges according to standard ASME B16.5
Maximum permitted temperature TS (C)
3.3 Sensor dimensions
Electromagnetic flowmeters FH30xx are intended for flow rate measurements with the fluid flow velocity
within the range of 0.025 to 10 m/s. In practical situations it is recommended to limit the fluid flow velocity
values to the range of 0.5 to 5 m/s. At low fluid flow velocities, the relative measurement error tends to
increase, while at high velocities flow turbulences may occur.
If the inner sensor diameter is the same as those of the connecting piping, the pressure loss at the meter
sensor is negligible.
If the operating fluid flow velocity is too low and the measurement error too high it is possible to
increase the fluid velocity by using a meter sensor of a smaller size with the corresponding
reduction of the inner diameters of the connecting pining. The disadvantage of this solution
consists of a pressure loss at the pipe reduction area. Therefore, in practical situations, to
reduce the pressure loss to a reasonable value, the pipe size reduction should be limited to a
single degree.
Fluid flow velocity in a piping can be calculated using the formula:
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