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Pressure Switch
Alco Controls
D A T A S H E E T
PS3__35003_EN_R08.doc 3 / 10 09.08.2011
Selection
1. Preferred types
Type PCN Fixed setting
(bar)
Reset Max.
temperature
pressure
Leakage
test
pressure
Pressure
connection
Cut-out Cut-in ambient connection (bar)
High Pressure Controls
PS3-A6S 0 715 603 16,0 11,0 7/16"-20 UNF
PS3-A6S 0 715 604 19,0 15,0 Auto
+ 70°C + 150°C
48 female thread with
PS3-A6S 0 715 600 26,5 22,5 Schrader opener
Low Pressure Controls / Pressure Limiter for low pressure protection PSL EN 12263
PS3-W1S 0 714 760 -0,3 1,2 7/16"-20 UNF
PS3-W1S 0 714 761 0,3 1,8 Auto
+ 70°C + 70°C
30 female thread with
PS3-W1S 0 714 762 2,0 3,5 Schrader opener
Pressure Limiter for high pressure protection PSH with snubber for direct compressor mounting EN 12263
PS3-W6S 0 715 831 14,0 10,0
PS3-W6S 0 715 556 21,0 16,0 7/16"-20 UNF
PS3-W6S 0 715 555 25,0 20,0 Auto
+ 70°C + 150°C
48 female thread with
PS3-W6S 0 715 567 29,0 23,0 Schrader opener
PS3-W6S 0 715 550 33,5 27,5 and snubber
PS3-W6S 0 715 553 40,0 33,0
Pressure Cut Out for high pressure protection PZH with snubber for direct compressor mounting EN 12263
PS3-B6S 0 715 568 19,2
PS3-B6S 0 715 564 22,7 appr. external 7/16"-20 UNF
PS3-B6S 0 715 563 27,3 5 bar manual
+ 70°C + 150°C
48 female thread with
PS3-B6S 0 715 569 29,5 below reset Schrader opener
PS3-B6S 0 715 560 36,0 cut-out and snubber
Delivery: small quantities, single package without plug (Cables with plug must be ordered separately, see page 8)
2. Customer specific types
Minimum batch size: 100 pieces
Switching points
The differential of factory set switch points can be adjusted
within the limits given in the charts on page 4 to 6. Use the
recommended lower switch point line in working envelope for
optimum results.
Example:
Step 1: Select your desired upper switch point P
1
. Draw a
horizontal line to cross the upper switch point line.
Step 2: Draw a vertical line from this intersection point.
Step 3: Select your desired switch point between P
2
and P
4
.
Notes:
1. Specify always upper and lower switching points for
pressure switch with automatic reset function.
2. Specify only cut-out switching point for pressure switch
with manual reset function.
3. For versions with micro-switch only one switching point can
be adjusted while the second switching point is determined
by the fixed differential of the micro-switch (see Pressure
Ranges on page 2).
4. Specify such devices with one switching point as the
significant point and the other one as non-significant by
putting the latter in brackets, e.g. PS3-AJS 2.0/(1.8)
Example
0
10
20
30
40
01234567891011
P
1
P
2
P
3
P
4
max. lower..
min. lower...
recommended lower ...
... switching point
Upper switching point
pressure
(bar)