Dwyer Instruments SERIES PG Data Sheet

SERIES PG | GAS PRESSURE/DIFFERENTIAL PRESSURE SWITCHES

FEATURES/BENEFITS

•Clear,easy-to-readscaleandexternalsetpointadjustmentsimpliesoperationandtroubleshooting

•Largediaphragmprovidesaccuracyforprecisecontrol

•Multipleswitchingoptionsmeetthedesignofapplications

DESCRIPTIONAPPLICATIONS

• Natural, manufactured or LP gas applications

Large sensitive diaphragm and reliable, time proven mechanical design are combined in Series PG Pressure/Differential Pressure Switches. For use with air and other compatible gases, they feature excellent ±1% of full scale repeatability, clear, easy-to-read scale and convenient external

set point adjustment. Application exibility is assured by a large variety of

switching options including SPST, SPDT, DPST, and DPDT; opening or closing on increasing pressure, vacuum or differential. Mercury switches or hermetically sealed snap switches are available where high humidity would be a problem. If vibration or other factors preclude the use of mercury, snap switched can be provided. Standard housing is NEMA 1. Optional enclosures can be supplied for weather resistant and explosionproof requirements.

SPECIFICATIONS

Wetted Material Fairprene, brass, steel, and aluminum.

Temperature Limits -10 to 180°F (-23 to 82°C).

Pressure Limit Single pressure use on high side: Sustained pressure: 15 psig (1.0 bar); Surge limit: 20 psig (1.4 bar). Differential pressure

use: Sustained pressure, range P1: 2 psig (0.14 bar); Sustained pressure, range P2: 10 psig (0.7 bar).

EnclosureRating General purpose. Weatherproof and explosion-proof optional.

Repeatability ±1% of full range.

Switch Type SPST mercury switch, SPDT mercury switch, SPDT snap switch, or SPDT hermetically sealed snap switch. Optional DPDT.

ElectricalRating 4 A @ 120 VAC/VDC’ 2 A @ 240 VAC/VDC (Code M); 6 A @ 120 VDC/VAC’ 3 A @ 240 VAC/VDC (Code K); 10 A @ 120

Electrical Connections Screw type.

Conduit Connection 7/8˝ (22.23 mm) hole for 1/2˝ (12.7 mm) conduit hub.

Process Connection 1/2˝ male NPT and 1/8˝ female NPT used for single positive pressure or high differential pressure, 1/8˝ female NPT used for

MountingOrientation Vertical.

Set Point Adjustment External screw.

Weight 4.5 lb (2 kg).

Deadband See model chart.

AgencyApprovals FM, UL for mercury switch models. UL only on snap switch models.

VAC/VDC’ 5 A @ 240 VAC/VDC (Code L); 1 A @ 120 VAC/VDC, 0.5 A @ 240 VAC/VDC (Code N). SPDT snap: 15 A @ 120 VAC; 8 A @ 240 VAC; 0.5 A @ 120 VDC; 0.25 A @ 240 VDC. SPDT H.S. silver snap: 5 A @ 125/250 VAC; 30 VDC resistive. SPDT H.S. gold snap: 1 A @ 125 VAC; 30 VDC resistive.

single vacuum or low differential pressure.

DIMENSIONS

ADJUSTMENT

SCREW

[3] Ø13/64 [5.16] MOUNTING HOLES EQUALLY SPACED ON 6-1/2 [165.10] B.C.

1/8 FEMALE

30°

45°

Ø7/8 [22.23]

CONDUIT

CONNECTION

NPT PRESS. CONN.

1/2 MALE NPT X

1/8 FEMALE NPT

PROCESS CONN.

3/4 [19.05] CLEARANCE FOR COVER REMOVAL

HOW TO ORDER

Use the bold characters from the chart below to construct a product code.

PG W -2 -P1 -ATR

SERIES

General purpose enclosure, NEMA 1 (standard)

PR: Manual reset, operates on pressure increase

automatically, resets on decrease

PRL: Manual reset, operates on pressure decrease

automatically, resets on increase

HOUSING OPTIONS

W: Weather-resistant enclosure, NEMA 2, 3R (optional)

8-1/4

[209.55]

Ø7

[177.80]

Ø6-1/64 [152.78]

1/4 [6.35]

4 [101.6]

1-27/64 [36.12] 17/32 [13.49]

1-3/16 [30.16]

OPTIONS

-ATR: Aluminum tag (riveted)

-ATW: Aluminum tag (wired)

-PE: Prep for EP

-PRESET: Preset and pressure check set point

-PT: Paper tag

-STR: Stainless steel tag (riveted)

-STW: Stainless steel tag (wired)

-23720: Fungus proong special

-23444: O2 acetylene special

-RCH: Rigid conduit hub

CIRCUIT

-2: SPST mercury switch, electrical

code K, opens on vacuum, pressure or differential pressure increase

-2P: SPST mercury switch, electrical code L, opens on vacuum, pressure or differential pressure increase

-3: SPST mercury switch, electrical code K, closes on vacuum, pressure or differential pressure increase

-3P: SPST mercury switch, electrical code L, closes on vacuum, pressure or differential pressure increase

-153: SPDT mercury switch, electrical code M

-103: DPST, (2) SPST mercury switches, electrical code L, both close on increase, FM approved, PG, PGW only

-105: DPST, two SPST mercury switched, one electrical code L, one electrical code N, both open on decrease

-119: (2) mercury switches, SPST NO (DPST)

-127: DPST, (2) SPST mercury switches, electrical code L, both open on increase

-129: DPST, (2) SPST mercury switches, one electrical code L, one electrical code N, both open on increase

-131v (2) mercury switches, SPST NC (DPST)

-152: (1) mercury switch, SPDT (4-wire)

ADJUSTABLE DIFFERENTIAL PRESSURE RANGES WITH MAXIMUM SUSTAINED PRESSURES

-P1: Adjustable range 1.0-30 in w.c. (25-760 bar)

-P2: Adjustable range 0.5-5 psig (0.03-0.35 bar)

-P3: Adjustable range 2.5-76.3 cm w.c.

-156: SPDT, (2) SPST mercury switches, electrical code L, one opens on increase, one closes on increase

-158: SPDT, (2) SPST mercury switches, one electrical code L opens on increase, one electrical code N - closes on increase

-161: SPDT, (2) SPST mercury switches, one electrical code L opens on decrease, one electrical code N - closes on decrease

-190: (2) mercury switches, SPST NC; SPST NO (SPDT)

-804: DPDT, (2) SPDT mercury switches, electrical code M

-7000-153: SPDT, snap acting switch, rated 15A at 120 VAC, 8A at 240 VAC, 0.5A at 120 VDC, 0.25A at 240 VDC

-7000-153HG: SPDT, hermetically sealed snap switch, rated 1A at 125 VAC, 1A resistive at 30 VDC

-7200-804: DPDT, (2) SPDT snap acting switches, rated 5A at 120/240 VAC, 30 VDC resistive

Note: Other circuits available, consult factory. For electrical codes,

see specications.

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Product/SeriesPG

DWYER INSTRUMENTS, INC.

Important Notice: Dwyer Instruments, Inc. reserves the right to make changes to or discontinue any product or service identied in this publication without notice. Dwyer advises its customers to obtain the

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