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Pressure and Differential
Pressure Switches, Watertight
and Explosion-Proof Enclosure,
P-Series
This top-of-the-line Ashcroft® pro-
cess switch series includes many
state-of-the-art features for safety
and reliability in virtually all process
applications.
• Die cast aluminum enclosure is
standard with NEMA 4X (weatherproof, corrosion resistant) NEMA 7
(explosion-proof enclosure Class
I, Div. 1 & 2, Groups B, C & D and
Class II, Div. 1 & 2, Groups E, F & G).
Dual chamber design allows setpoint changes to be made safely
even with power connected.
1 - FUNCTION
PPA - Pressure control, single setpoint,
adjustable deadband
PPD - Pressure control, two independently
adjustable setpoints, fixed deadband
PPS - Pressure control, single setpoint,
fixed deadband
PDA - Differential pressure control, single
setpoint, adjustable deadband
PDD - Differential pressure control, two inde-
pendently adjustable setpoints, fixed
deadband
PDS - Differential pressure control, single
setpoint, fixed deadband
2 - ENCLOSURE
N7 - NEMA 7/9, IP65, watertight, corrosion
resistant and explosion proof Div. 1 & 2
3 - SWITCH ELEMENTS FOR PPA & PDA
CONTROLS
Description/Maximum Electrical Ratings
Code
UL/CSA Listed
10A,125/250 Vac
H General purpose 1/2A, 125 Vdc
1/4A, 250 Vdc
Hermetically sealed
J switch, general
purpose
SWITCH ELEMENTS FOR PPD, PPS,
PDD & PDS CONTROLS
Code
Single Dual
(PS) (PD)
(4)
K
KK Narrow deadband 15A, 125/250 Vac
(4)
F
FF Sealed environment 15A, 125/250 Vac
proof
15A, 125/250/480 Vac
(5)
G
GG General purpose 1/2A, 125 Vdc
1/4A, 250 Vdc
Hermetically sealed
(3)
P
PP switch, narrow 5A, 125/250 Vac
deadband
Hermetically sealed
J JJ switch, general
purpose
11A, 125/250 Vac
5A, 30 Vdc
Switch Elements
UL/CSA Listed
11A,125/250 Vac
5A, 30 Vdc
S
• Single or dual independently
adjustable setpoints meet all
setpoint requirements
• UL, CSA
(7)
listed
• Fixed or adjustable deadband
• Readily available
• Standard pressure connection
materials:
Pressure psi ranges
- 316L stainless steel
Differential pressure ranges
- Nickle plated brass
(8)
Pressure and differential inches
of water ranges
- Epoxy coated carbon steel
• Setpoints adjustable from 15-100%
of range
• Dual Seal Rating models available
(1)
4 - ACTUATOR SEAL
Code Process
& Temp.
Material Limits in.H2O psi psi 3000
°F psi
B-Buna N 0 to 150
V-Viton 20 to 300
T-Teflon 0 to 150
(6)(9)
S-SS
0 to 300
(6)
P-Monel
0 to 300
5 - PRESSURE PORT
Order Code
25
06
1
07
(2)
(1)
1
⁄4 NPT Female
1
⁄4 NPT Female and
1
⁄2 NPT Male Combination
⁄2 NPT Female
Range
Vac. 0-600 1000 2000-
6 - OPTIONS
See pages 238-239
7 - STANDARD PRESSURE RANGES
See page 236
TO ORDER THIS P-SERIES PRESSURE SWITCH:
NOTES:
1. These items are wetted by process fluid.
2. Ambient operating temperature limits –20 to 150°F,
all styles. Setpoint shift of ±1% of range per 50°F
temperature change is normal. Switches calibrated at
70°F reference.
3. Estimated dc rating, 2.5A, 28 Vdc (not UL listed).
4. Estimated dc rating, .4A, 120 Vdc (not UL listed).
5. Not UL listed at 480 Vac.
6. Available on pressure only.
7. Refer to Option Table.
8. Order Option XUD, stainless steel process connection.
9. On differential switches, stainless steel is
available in 15, 30, 60 and 90 psid ranges only.
Includes Teflon O-ring and 316 SS connection.
HERMETICALLY SEALED SWITCH
We recommend hermetically sealed switch elements
for improved reliability. The hermetically sealed switch
provides uncompromising contact protection in harsh
or corrosive environments.
Features:
• UL-recognized component,
guide WSQ2, File E85076
• All-stainless steel welded
construction
Select: PPD N7 GG B 25 XK3 30#
1. Function:
2. Enclosure:
3. Switch Element:
4. Actuator Seal:
5. Pressure Port:
6. Options (see pages 238-239):
7. Pressure Range (see page 236):
LOOK FOR THIS AGENCY
MARK ON OUR PRODUCTS
Consult factory for guidance in product selection
Phone (203) 378-8281 or visit our web site at
www.ashcroft.com
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