Advertisement
H Y D R A U L I C , P I S T O N - S T Y L E P R E S S U R E S W I T C H
SWITCH SELECTION AND MOUNTING INSTRUCTIONS
• Select a switch such that the desired switching point falls roughly
in the middle of the adjustment range.
• Do not exceed switch electrical ratings. Use an appropriately sized relay when
switching larger electrical loads.
• For liquid media with pressure spikes and/or pulsating pressures, install a
pressure snubber.
• For outdoor applications, sufficient protection must be provided.
ADJUSTMENT OF SWITCHING POINT
Either the upper or the lower switching point may be adjusted.
The opposite one is then fixed by the hysteresis characteristics of the switch.
Use a pressure gauge for exact adjustment. Proceed as follows:
1. Loosen locking screw.
2. Adjust the switching point using a 5-mm hexagon wrench.
Clockwise rotation increases switching pressure and
counter-clockwise rotation decreases switching pressure.
Low-end of adjustment range is reached when top of
adjustment barrel is approximately level with top of switch
housing. High-end of adjustment range is reached when
adjustment barrel is fully CW.
3. Re-tighten locking screw.
MAKING AND BREAKING CAPACITY
TYPE
LOAD
OF
LEVEL*
CURRENT
Standard
AC
(relays,
solenoids)
AC
DC
DC
Low
AC
(electronic
circuits)
DC
*Load Level Explanation
PSW18H Series pressure switches have microswitch
contacts with gold plating over silver base metal. The gold
plating remains intact when "low level" voltage / current
levels are observed. This feature assures highly reliable
switching in low-level electronic circuits.
Standard applications do not require the gold plating – which
will decay naturally when switching larger electrical loads.
TYPE
VMIN
MAXIMUM PERMANENT
OF
[V]
CURRENT I MAX [A] AT V
LOAD
24 V
Resistive
12
Inductive
12
PF
.7
Resistive
12
Inductive
12
L/R
10 ms
Resistive
5
Inductive
5
L/R
10 ms
Notes:
1. Reference conditions:
30 cycles per min and 86°F (30°C) ambient.
2. Reducing load current to 50% of Imax approximately
doubles contact life.
125 V
250 V
5
5
5
3
3
3
5
.4
_
3
.05
_
.34
.08
.04
.1
_
_
Adjustment Of Switching Points
Locking Screw
CONTACT LIFE
ELECTRICAL
MECHANICAL
AT I MAX
AT I
5 x 10
4
approx 10
switching
switching
cycles
cycles
2 x 10
5
approx 10
switching
switching
cycles
cycles
0
7
7
Advertisement
