Location considerations - PENN Controls - F261KEH - F261KFH - F261MEH - F261MFH - Flow, Liquid Level, and Air‐Volume Control - F261 Fluid Flow Switch

F261 Series Flow Switches Installation Guide

Product name
F261 Fluid Flow Switch
Document type
Installation Guide
Document revision
F
Revision date
2020-11-19
Figure 1. Flow direction for vertical mounting

Important: Do not use the F261 flow switch in a vertical pipeline with a downward flow.

Mount the F261 flow switch in a horizontal pipeline or a vertical pipeline with upward fluid flow. When you mount the switch in a vertical pipe with an upward flow, it trips at a slightly higher flow than in Table 2 and Table 3, due to the effect of gravity on the switch mechanism.

Mount the F261 flow switch in a section of pipe where there is a straight run of at least five pipe diameters from the nearest elbow, valve, or other pipe restriction. See Figure 2.

Figure 2. Required piping distance

Table 1. Required piping distance callouts
Callout Description
A Distance of at least five pipe diameters from the nearest elbow, valve, or other pipe restriction
B Flow
C Tee or welded half-coupling

When you mount the flow switch on a horizontal pipe, mount the flow switch within 60 degrees of vertical. See Figure 3.

Figure 3. Correct flow switch angle

Note: Do not subject the flow switches to water hammer. Use a suitable water hammer arrester if a fast-closing valve is located downstream of the switch. See Figure 4.
Figure 4. Water hammer arrester location

Table 2. Water hammer arrester callouts
Callout Description
A Water hammer arrester
B Flow