Low Pressure SWICHGAGE ®

Low Pressure SWICHGAGE ®
PWC-94125B
Revised 02-97
Catalog Section 05
®
FRANK W.
(00-02-0033)
MFR.
®
Low Pressure SWICHGAGE
20PWC, 25PWC and A25PWC Series
2 and 2-1/2 in. (51 and 64 mm) Dial
■
For Monitoring Fuel Gas Pressure or
Engine Crankcase Pressure
■
Actuate Alarm or Shut Down System
When Abnormal Pressure Occurs
■
Combination Indicating Gage and
Critical Limit Switch
20PWC-10
Description
Specifications
The PWC Series SWICHGAGE® is excellent
for low pressure applications such as engine
shutdown when fuel gas pressure falls to low
level. Suitable for both natural gas or
methane–these SWICHGAGE® instruments
can also be used to monitor high engine
crankcase pressure (order option “H”).
The 20 and 25 series gage mechanism is
enclosed in a steel case coated to resist corrosion. The 20 series has a 2 inch (51 mm)
diameter dial. The 25 series has a 2-1/2 in.
(64 mm) diameter dial.
The A25 series gage has a sealed polycarbonate case and includes a 2-1/2 in. (64 mm)
diameter dial.
All gages feature a polycarbonate, breakresistant lens and a polished, stainless steel
bezel to help protect these rugged, built-tolast instruments.
The PWC series is available in either the
SWICHGAGE® version with adjustable high
and/or low switch contact(s) or in the indicating MURPHYGAGE® configuration.
The SWICHGAGE® incorporates an accurate
direct-reading gage with a limit switch (low
contact for fuel gas pressure; high contact for
crankcase pressure) that can be adjusted from
the front of the gage. The switch can be used to
activate alarms and/or shut down equipment.
Ranges:
20PWC Series
• 0-4 in. H2O; single scale
• 0-10 in. H2O; single scale
• 0-20 in. H2O / 0-51 cm; dual scale
• 0-30 in. H2O / 0-76 cm; dual scale
• 0-50 in. H2O / 0-127 cm; dual scale
25PWC and A25PWC Series
• 0-30 in. H2O / 0-76 cm; dual scale
• 0-50 in. H2O / 0-127 cm; dual scale
Contact Rating: 2 A @ 30 Volts AC/DC.
Accuracy: ±3% first and last 1/3 of scale,
±2% middle 1/3 of scale.
Maximum Pressure: 2 x scale.
Process Connection: 1/8-27 NPTM brass.
Dial: White on black; single scale (inches)
and dual scale (inches/centimeters).
Limit Switch Adjustment: 1/16 hex wrench.
Mounting Hole: 2-1/16 in. (52 mm).
Bezel: Polished stainless steel.
Lens: Polycarbonate.
Mounting Studs: 10-32 UNF.
Case:
• 20PWC and 25PWC Series: Plated steel.
• A25PWC Series: Polycarbonate.
Wiring (SWICHGAGE® Only):
• 20PWC Series: One point,
#6 terminal block, case ground.
• 25PWC Series: Wire lead; 18 AWG x
12 in. (1.0 mm2 x 305 mm).
• A25PWC Series: #6 terminal block.
Mounting Clamp: Plated steel.
Shipping Weight:
• 20PWC Series: 9 oz. (279 g).
• 25PWC and A25PWC Series:
11 oz. (342 kg).
Shipping Dimensions:
• 20PWC Series:
3 x 2-3/4 x 2-3/4 in. (76 x 70 x 70 mm).
• 25PWC and A25PWC Series:
4-3/4 x 4-3/4 x 2-3/4 in. (121 x 121 x 70 mm).
Warranty
A two-year limited warranty on materials and
workmanship is given with this Murphy product.
Details are available on request and are packed
with each unit.
Dimensions
A
Internal Wiring
Mounting Hole
B
Mounting
Clamp
D
Pointer
C
Contact
1/8-27 NPTM
Connection
(SWICHGAGE®
Contact Wiring
models only)
• 20PWC Series: #6 one-point terminal block
• 25PWC Series: 18 AWG x 12 in.
(1.0 mm2 x 305 mm)
• A25PWC Series: #6 terminal block
Limit Switch
Contact
A
B
C
D
1/16 Hex for Limit Switch
Contact Adjustment
20PWC Series
25PWC Series
A25PWC Series
2-7/32 (56)
1-5/16 (33)
2-15/64 (57)
2-1/16 (52)
2-1/8 (54)
1-3/8 (35)
3-1/8 (79)
2-11/16 (68)
1-51/64 (46)
1-27/64 (36)
2-29/32 (74)
2-11/16 (68)
Contact Rating: 2 Amps @ 30 VAC/DC.
20PWC and 25PWC are case ground.
A25PWC is isolated ground.
NOTE: Dimensions are in inches and (millimeters).
How to Order
To order, use the diagram below. NOTE: List options in ascending alphabetical order (A-Z). Example: 20PWC-H-10.
_____ – _____ – _____
Base Model
Range
20PWC
20PWCG (Gage-only, no contacts)
25PWC*
25PWCG (Gage-only, no contacts)*
A25PWC*
A25PWCG (Gage-only, no contacts)*
4 = 0-4 in. (0-10 cm)
10 = 0-10 in. (0-25 cm)
20 = 0-20 in. (0-51 cm)
30 = 0-30 in. (0-76 cm)
50 = 0-50 in. (0-127 cm)
*25 Series and A25 Series available in 0-30 in.
(0-76 cm) and 0-50 (0-127 cm) ranges only.
Options†
B1 = Black bezel; low profile
B2 = Bezel; raised profile (was “HP”)
B3 = Black bezel; raised profile (was “HBB”)
EX = Explosion-proof
EL = Explosion-proof, less case
H = High contact only (as optional)
HL = High and low contacts (as optional)
I = Illumination
J = Screwdriver adjustable face contact
K = Knob adjusting face contact
RP = Red tipped pointer
TP = Tamperproof contact
†Options not available on all models or configurations.
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.
®
FRANK W.
Since 1939
MFR.
■ Frank W. Murphy Manufacturer
P.O. Box 470248; Tulsa, Oklahoma 74147; USA
tel. (918) 627-3550 fax (918) 664-6146
e-mail [email protected]
■ Frank W. Murphy Southern Division
P.O. Box 1819; Rosenberg, Texas 77471; USA
tel. (281) 342-0297 fax (281) 341-6006
e-mail [email protected]
Printed in U.S.A.
■ Frank W. Murphy, Ltd.
Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
tel. +44 1722 410055 fax +44 1722 410088 tlx 477088
e-mail [email protected]
■ Frank W. Murphy Pte., Ltd.
26 Siglap Drive; Republic of Singapore 456153
tel. +65 241-3166 fax +65 241-8382
e-mail [email protected]
■ Murphek Pty., Ltd.
1620 Hume Highway; Campbellfield, Vic 3061; Australia
tel. +61 3 9358-5555 fax +61 3 9358-5558
■ Murphy de México, S.A. de C.V.
Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje
San Luis Potosí, S.L.P.; México 78384
tel. +52-48-206264 fax +52-48-206336
e-mail [email protected]
■ Murphy Switch of California
P.O. Box 900788; Palmdale, California 93590; USA
tel. (805) 272-4700 fax (805) 947-7570
e-mail [email protected]
■ Frank W. Murphy France
tel. +33 1 30 762626 fax +33 1 30 763989
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