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Series-PG
Gas Pressure Switches for Air/Gases, ± 1% Repeatability, SPST/SPDT Options
- Clear easy-to-read scale and external set point adjustment simplifies operation and trouble shooting
- Large diaphragm provides accuracy for precise control
- Multiple switching options meet the design of applications
Series-PG
From
$
1,078.42
Product Overview
- Applications Fuel and Gas
- Electrical Connection 1/2 in NPT female Conduit with Screw Terminal block
- Enclosure Ratings None
- Materials, Wetted Aluminum, Brass, Buna-N (NBR), Steel
- Mounting Orientation Vertical
- Operating Temperature, Max 180 °F
- Operating Temperature, Min -10 °F
- Measurement Pressure Type Differential
- Process Connection Note 1/2˝ male NPT and 1/8˝ female NPT used for single positive pressure or high differential pressure, 1/8˝ female NPT used for single vacuum or low differential pressure
- Process Connection Size 1/2 in x 1/8 in
- Process Connection Type NPT Male and Female
- Proof Pressure Up to 2 psi
- Repeatability ± 1%
- Series ID Series-PG
- Set Point Adjustment External Screw
- Switch Note SPDT Snap: 15A @ 120 VAC, 8A @ 240 VAC, 0.5A @ 120 VDC, 0.25A @ 240 VDC
- Switch Rating 15 A @ 120 Vac, 8A @ 240 Vac, 0.5A @ 120 Vdc, 0.25A @ 240 Vdc
- Switch Type SPDT NO/NC, Selectable
- Weight 2 kg
Supported Applications
The Dwyer Series PG Gas Pressure Switches are designed for pressure, vacuum, and differential pressure applications involving air or compatible gases. The series utilizes a large sensitive diaphragm to actuate mercury switches or snap switches, separating two pressure chambers for adaptability in various control scenarios.
- Natural gas systems
- Manufactured gas systems
- Liquefied petroleum (LP) gas systems
Operating Conditions & Performance
The Series PG offers a repeatability of ±1% of full range. Process temperature limits are specified as -10 to 180°F (-23 to 82°C). Wetted materials include Fairprene, brass, steel, and aluminum.
Pressure ratings vary by application mode:
- Single pressure use on high side: Sustained pressure: 15 psig (1.0 bar); Surge limit: 20 psig (1.4 bar).
- Differential pressure use, range P1: Sustained pressure: 2 psig (0.14 bar).
- Differential pressure use, range P2: Sustained pressure: 10 psig (0.7 bar).
Adjustable Measurement Ranges
The series supports the following adjustable differential pressure ranges:
- P1: 1.0" - 30" H2O / 1 - 17 oz.
- P2: 1/2 - 5 Psig (also KG/cm²)
Configuration Options
The Series PG is configurable across multiple circuit types, housing options, and special service requirements. External set point adjustment is provided via a screw mechanism.
Circuit Configurations & Ratings
Switching elements include SPST mercury switches, SPDT mercury switches, SPDT snap switches, and hermetically sealed snap switches (silver or gold). DPDT options are available. Electrical ratings vary by circuit code:
- Mercury Switches (Code M): 4 A @ 120 VAC/VDC; 2 A @ 240 VAC/VDC.
- Mercury Switches (Code K): 6 A @ 120 VDC/VAC; 3 A @ 240 VAC/VDC.
- Mercury Switches (Code L): 10 A @ 120 VAC/VDC; 5 A @ 240 VAC/VDC.
- Snap Acting Switch (-7000-153): 15A at 120 VAC, 8A at 240 VAC, 0.5A at 120 VDC, 0.25A at 240 VDC.
- Hermetically Sealed Silver Snap (-7000-153HG): 1 A @ 125 VAC; 1 A resistive @ 30 VDC.
Housing & Enclosure Options
The standard enclosure is General Purpose, NEMA 1. Weather-resistant enclosures (NEMA 2, 3R) are available as an option. The unit features a vertical mounting orientation with screw-type electrical connections and a conduit connection hole of 7/8" (22.23 mm) for a 1/2" (12.7 mm) hub.
Process Connections
- Rear Pressure Chamber: 1/2" male NPT, 1/8" female NPT.
- Front Pressure Chamber: 1/8" female NPT.
Special Options & Accessories
The series supports various options including:
- Fungus proofing special (-23720)
- O₂ acetylene special (-23444)
- Rigid conduit hub (-RCH)
- Preparation for EP
- Preset and pressure check set point
- Aluminum or stainless steel tags (riveted or wired)
Key Product Differences
The series includes distinct model families defined by reset behavior:
- PG: General purpose enclosure, NEMA 1.
- PR: Manual reset; operates on pressure increase automatically and resets on decrease.
- PRL: Manual reset; operates on pressure decrease automatically and resets on increase.
Circuit suffixes define the switch action (e.g., -2 opens on increase, -3 closes on increase) and electrical code. Specific models such as PG-7000 utilize a single snap switch, while PG-7200 utilizes double snap switches with different ratings.
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