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Chapter 2 Installation Series 780S Instruction Manual
2-2 IM-78S-B
Unobstructed Flow Requirements
Select an installation site that will minimize possible distortion in the
flow profile. Valves, elbows, control valves and other piping compo-
nents may cause flow disturbances. Check your specific piping condi-
tion against the examples shown below. To achieve accurate and re-
peatable performance, install the flow meter using the recommended
number of straight run pipe diameters upstream of the sensor.
Piping Condition Upstream
(1)
Requirements
Single 90° elbow or T-piece 1 D
Reduction (4:1) 3 D
Expansion 3 D
After a control valve 3 D
Two 90° elbows (in same plane) 3 D
Two 90° elbows (different planes) 5 D
(1) Number of diameters (D) of straight pipe required between upstream disturbance and the flow meter sensor.
Table 2-1. Pipe Length Requirements for Installation
Installing the Flow Meter
SIERRA
Flow direction indicator
should point downstream
in the direction of flow
FLOW
Enclosure
adjustable to any
viewing position
Figure 2-1. Flow Meter Orientation (Flange Connection Shown)
When positioning the flow meter, refer to the flow direction indicator
attached to the probe. For proper operation, install the meter with the
flow direction indicator pointing downstream in the direction of flow.
Installing the meter opposite this direction may result in inaccurate
flow measurement.