47-602 F10 and F50 Flow Switches
5
1.2.2 Model F50
On an increasing flow rate, the flow disc moves the attrac-
tion sleeve up within the field of a switch magnet, drawing
it in tightly to the enclosing tube. This causes the switch
to make or break an electrical circuit. When the flow rate
drops, below the rate for which the flow disc is calibrated,
the attraction sleeve is pulled downward until, at a prede-
termined low flow rate, the switch magnet releases and
swings outward, away from the enclosing tube, causing a
reversal of the switching action.
2.0
Installation
This section provides detailed procedures for properly
installing Model F10 and F50 Flow Switches.
2.1
Unpacking
Caution:
If equipment is used in a manner not specified by the
manufacturer, protection provided by the equipment may
be impaired.
Unpack the instrument carefully, inspecting all compo-
nents for damage. Report any concealed damage to the
carrier within 24 hours. Check the contents of the carton/
crate against those listed on the packing slip, and report
any discrepancy to the factory. Check the part number on
the nameplate to be certain it agrees with the part number
shown on the packing slip and purchase order. Record the
serial number for future reference when ordering parts.
2.2
Piping
NOTE: For proper performance, a straight pipe run of 12 pipe diame-
ters up stream and 3 pipe diameters downstream of the switch
is recommended.
2.2.1 Model F10
The F10 flow switch should be located in a horizontally
run pipe with the arrow on the body bushing or mounting
flange pointing in the direction of flow.
2.2.2 Model F50
The Model F50 flow switch should be located in a hori-
zontal pipe run, with the arrow on the valve body pointing
in the direction of flow. The switch housing must always
be above the valve body.
Figure 3—No Flow Position
Figure 4—Position w/Actuating
Flow Present
Snap switch
Swing out
position
Return
spring
Pivot
Enclosing
tube
(non-magnetic)
Swing in
position
Sleeve
(magnetic)
Magnet
Flow disc
Return
Spring
Pivot
