(Figure 3)
ELECTRICAL CONNECTIONS
(SEE FIGURE 3)
Before pressure is applied to the diaphragm,
the switch contacts will be in the normally
closed (NC) position as shown in
Figure 3
.
The snap switch has screw top terminals
with cup washers. Wire alarm or control ap-
plication as shown in
Figure 4
.
(Figure 4)
(Figure 2)
SPECIFICATIONS
MODEL AFS-460 AIR
PRESSURE SENSING
SWITCH WITH MANUAL
RESET FEATURE
Mounting Position:
In order to meet lowest operating
specifications, mount with the dia
-
phragm in any vertical plane.
Set Point Range:
0.40 ± 0.06"w.c. to 12.0"w.c.
Field Adjustable
“Operate Range”:
0.46"w.c. to 12.0" w.c.
Measured Media:
Air
Maximum Pressure:
½ psi (0.03 bar)
Life:
Exceeds UL-recognized mechanical
endurance test of 6,000 cycles mini
-
mum at 0.5 psi maximum pressure
each cycle and at maximum rated
electrical load
Electrical Rating @ 60 Hz.:
15A @ 125, 250, or 277 VAC.
½ A @ 125 VDC, ¼ A @ 250 VDC.
¼ hp @ 125 VAC; ½ hp @ 250 VDC.
Contact Arrangement:
SPST–NC (manual reset)
Electrical Connections:
8-32 screw-top terminals with cup
washers
Conduit Connection:
⅞" diameter opening accepts ½"
conduit
Sample Line Connectors:
Male, externally threaded
7
⁄
16
" 24 UNS
2A thread, complete with nut and self-
aligning ferrule
Sample Line Connections:
Connectors accept ¼" OD rigid or
semi-rigid tubing
Approval and Recognition:
UL, CSA, CE
Shipping Weight:
1.2 lbs.
Accessories:
• P/N 18311 Slip-on ¼" OD Tubing
Adapter, suitable for slipping on flex
-
ible plastic tubing
• Sample line probes
• Orifice plugs (pulsation dampers)
FIELD ADJUSTMENT
The adjustment range of an
AFS-460
Air
Switch is 0.4" ± 0.06" w.c. to 12.0" w.c. To
adjust the set point, turn the adjusting screw
counterclockwise until motion has stopped.
Next, turn the adjusting screw four complete
turns in a clockwise direction to engage the
spring. From this point, the next ten turns will
be used for the actual calibration.
Each full
turn represents approximately 1.16" w.c.
Please note:
To properly calibrate an air
switch, a digital manometer or other mea-
suring device should be used to confirm the
actual set point.
