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(3) For flow measurement, tapping for the differential pressure must be done in the “pipe tap”
system. Therefore, install the high-pressure-side tap at a position of 2.5D (D denotes the
inside diameter of the process pipe) from the upstream side of orifice and position the
low-pressure-side tap at a distance of 8D from the downstream side of the orifice.
The tapping connection is of a 3 in. flange connection type. The flanges of the extension seal
type of meter body can be directly used for tapping flanges.
5-10. Elevation and suppression
5-10-1. Definitions of elevation and suppression
The terms “elevation” and “suppression” used in this manual are defined as follows:
Elevation:
Synonymous with “suppressed zero range”
An input range whose low end value is greater than zero.
For example, a range of 20 to 100.
Suppression: Synonymous with “elevated zero range”
An input range whose low end value is less than zero.
For example, a range of -20 to 0.
5-10-2. Setting of elevation / suppression
For the adjustment of elevation or suppression, refer to “Chapter 9 : Calibration and
Adjustment”.
Note) The specific-gravity of the liquid fill for models 71/72 is 0.935 at 20°C. (For temperature
compensation, use a factor of 0.008/10°C.)
Elevation
Suppression
100%
0%
kPa
{kgf/cm
2
}
100
{1.0}
20
{0.2}
Fig. 5-14. Elevation and suppression
