Pressure Switches – Erik Prayoga

Dwyer H2S-1 Dual-Action Explosion-Proof Pressure Switch

Erik Prayoga — Tue, 23 Jun 2026 02:18:24 +0000

Dwyer H2S-1 is a dual-action explosion-proof pressure switch designed for temperatures up to 275°F. With a UL listed explosion-proof enclosure, it meets NEMA 4X standards (IP66) and is CSA approved for use in hazardous locations. It features a 316 SS chamber with an FEP diaphragm, 18" long electrical connections, and a 1/4" female NPT process connection. The switch has two SPDT snap switches with a 1500 psig pressure limit and a deadband of approximately 10% of the range.

Specifications

(Instrument-Sensor) NEMA Protection	NEMA 4X
(Instrument-Sensor) IP Protection	IP66
Component	Pressure Switch
(Instrument-Sensor) Type	Explosion-Proof
(Instrument-Sensor) Temperature Range	275°F/135°C
(Instrument-Sensor) Temperature Range	-20 – 90°C/ -4 – 184°F
Manufacturer	Dwyer Instruments

Features

Explosion-proof and weather-proof housing provides device protection for outdoor use or harsh environment operation

UL listed, CSA approved to support rigorous process applications and regulations

Independent piston action design for either gas or liquid allows switches to active together or independently based on settings

Mounting in any position and not affected by vibration provides reliable switching for equipment

Dwyer H2S-3 Dual-Action Explosion-Proof Pressure Switch

Erik Prayoga — Tue, 23 Jun 2026 02:18:24 +0000

Dwyer H2S-3 is a dual-action explosion-proof pressure switch with a temperature range of -20 to 275°F (-4 to 135°C). It has a UL listed explosion-proof enclosure and is CSA approved for various hazardous locations. The switch has a 316 SS chamber, FEP diaphragm, and Buna-N O-ring. The electrical rating is 5 A @ 125/250 VAC and 3 A @ 30 VDC. It has two SPDT snap switches and a pressure limit of 1500 psig. The set point can be adjusted using the internal nut, and it can be mounted in any position. The switch has a 10% deadband and a 1/4" female NPT process connection. It also has a 3/4" female NPT conduit connection and an 18 AWG electrical connection.

Specifications

(Instrument-Sensor) NEMA Protection	NEMA 4X
(Instrument-Sensor) IP Protection	IP66
Component	Pressure Switch
(Instrument-Sensor) Type	Explosion-Proof
(Instrument-Sensor) Temperature Range	275°F/135°C
(Instrument-Sensor) Temperature Range	-20 – 90°C/ -4 – 184°F
Manufacturer	Dwyer Instruments

Features

Explosion-proof and weather-proof housing provides device protection for outdoor use or harsh environment operation

UL listed, CSA approved to support rigorous process applications and regulations

Independent piston action design for either gas or liquid allows switches to active together or independently based on settings

Mounting in any position and not affected by vibration provides reliable switching for equipment

Dwyer H2S-3S Dual-Action Explosion-Proof Pressure Switch

Erik Prayoga — Tue, 23 Jun 2026 02:18:24 +0000

Dwyer H2S-3S dual-action explosion-proof pressure switch is designed for temperature ranges from -20 to 90°C (-4 to 184°F). It has a UL listed explosion-proof enclosure rating, making it suitable for Class I, Groups B, C, and D, and Class II Groups E, F, and G. The switch is made of 316 SS chamber with FEP diaphragm and Buna-N O-ring standard, with an option for Fluoroelastomer or EPDM O-ring. It has a pressure limit of 1500 psig (103 bar) and electrical rating of 5 A @ 125/250 VAC, 5 A res., 3 A ind. @ 30 VDC. The switch type is two SPDT snap switches, with set point adjustment through an internal nut. The H2S-3S can be mounted in any position and has a 3/4" female NPT conduit connection. Deadband is approximately 10% of the range.

Specifications

(Instrument-Sensor) NEMA Protection	NEMA 4X
(Instrument-Sensor) IP Protection	IP66
Component	Pressure Switch
(Instrument-Sensor) Type	Explosion-Proof
(Instrument-Sensor) Temperature Range	275°F/135°C
(Instrument-Sensor) Temperature Range	-20 – 90°C/ -4 – 184°F
Manufacturer	Dwyer Instruments

Features

Explosion-proof and weather-proof housing provides device protection for outdoor use or harsh environment operation

UL listed, CSA approved to support rigorous process applications and regulations

Independent piston action design for either gas or liquid allows switches to active together or independently based on settings

Mounting in any position and not affected by vibration provides reliable switching for equipment

Dwyer DPS-233-3-64 Double Bellows Differential Pressure Switch

Erik Prayoga — Tue, 23 Jun 2026 02:18:23 +0000

Dwyer DPS-233-3-64 is a double bellows differential pressure switch with a temperature range of -10 to 180°F (-23 to 82°C). It has a general purpose, weatherproof, or explosion-proof enclosure rating with screw terminal electrical connections. The switch can be mounted vertically and has wetted materials of brass or 316SS. It has a thumbscrew set point adjustment and various conduit connection options.

Specifications

Component	Pressure Switch
(Instrument-Sensor) Temperature Range	-10 – 180°F/-23 – 82°C
(Instrument-Sensor) Type	Double Bellows
Manufacturer	Dwyer Instruments

Features

Bellows switch design provides sensitivity to pressure changes but resists vibration preventing out of range switching

External access to set and rest controls makes for easy adjustments

Visible set point indicators simplify changes

Dwyer H2S-2 Dual-Action Explosion-Proof Pressure Switch

Erik Prayoga — Tue, 23 Jun 2026 02:18:23 +0000

Dwyer H2S-2 is a Dual-Action Explosion-Proof Pressure Switch with a temperature range of -20°C to 90°C. It is UL listed explosion-proof and meets NEMA 4X (IP66) standards. The switch has a 316 SS chamber with an FEP diaphragm and Buna-N O-ring as standard wetted materials. It has a pressure limit of 1500 psig and features two SPDT snap switches.

Specifications

(Instrument-Sensor) NEMA Protection	NEMA 4X
(Instrument-Sensor) IP Protection	IP66
Component	Pressure Switch
(Instrument-Sensor) Type	Explosion-Proof
(Instrument-Sensor) Temperature Range	275°F/135°C
(Instrument-Sensor) Temperature Range	-20 – 90°C/ -4 – 184°F
Manufacturer	Dwyer Instruments

Features

Explosion-proof and weather-proof housing provides device protection for outdoor use or harsh environment operation

UL listed, CSA approved to support rigorous process applications and regulations

Independent piston action design for either gas or liquid allows switches to active together or independently based on settings

Mounting in any position and not affected by vibration provides reliable switching for equipment

Dwyer DPS-233-3-61 Double Bellows Differential Pressure Switch

Erik Prayoga — Tue, 23 Jun 2026 02:18:22 +0000

Dwyer DPS-233-3-61 is a double bellows differential pressure switch with a temperature range of -10 to 180°F (-23 to 82°C). It is suitable for general purpose, weatherproof, or explosion-proof enclosures and has screw terminal electrical connections. The switch can be mounted vertically and has wetted materials of brass or 316SS. The pressure limit is determined by the operating range, and the process connection is 1/8" NPT female for general purpose and weatherproof enclosures, and 1/4" NPT male for explosion-proof enclosures. The electrical rating and switch type can be found on the ordering page. The set point can be adjusted using a thumbscrew, and the conduit connection varies depending on the enclosure type.

Specifications

Component	Pressure Switch
(Instrument-Sensor) Temperature Range	-10 – 180°F/-23 – 82°C
(Instrument-Sensor) Type	Double Bellows
Manufacturer	Dwyer Instruments

Features

Bellows switch design provides sensitivity to pressure changes but resists vibration preventing out of range switching

External access to set and rest controls makes for easy adjustments

Visible set point indicators simplify changes

Dwyer DPS-233-3-62 Double Bellows Differential Pressure Switch

Erik Prayoga — Tue, 23 Jun 2026 02:18:22 +0000

Dwyer DPS-233-3-62 is a double bellows differential pressure switch with a temperature range of -10 to 180°F (-23 to 82°C). It has a general purpose, weatherproof or explosion-proof enclosure rating and screw terminal electrical connections. The switch can be mounted vertically and has wetted materials of brass or 316SS. It has a maximum pressure limit and process connections of 1/8" NPT female or 1/4" NPT male. The switch type is mercury or snap, and it has a thumbscrew set point adjustment. The conduit connection is 1/2" hole for conduit hub (general purpose), 1/2" conduit hub (weatherproof), or 3/4" NPT female (explosion-proof).

Specifications

Component	Pressure Switch
(Instrument-Sensor) Temperature Range	-10 – 180°F/-23 – 82°C
(Instrument-Sensor) Type	Double Bellows
Manufacturer	Dwyer Instruments

Features

Bellows switch design provides sensitivity to pressure changes but resists vibration preventing out of range switching

External access to set and rest controls makes for easy adjustments

Visible set point indicators simplify changes

Dwyer DPS-233-2-62 Double Bellows Differential Pressure Switch

Erik Prayoga — Tue, 23 Jun 2026 02:18:21 +0000

Dwyer DPS-233-2-62 is a double bellows differential pressure switch suitable for temperatures ranging from -10°F to 180°F (-23°C to 82°C). It is available in general purpose, weatherproof, or explosion-proof enclosures and features a screw terminal electrical connection. The switch can be mounted vertically and has wetted materials of brass or 316SS. It has a maximum pressure limit and is equipped with a mercury or snap switch, offering ease of set point adjustment with a thumbscrew. The conduit connection varies depending on the enclosure type.

Specifications

Component	Pressure Switch
(Instrument-Sensor) Temperature Range	-10 – 180°F/-23 – 82°C
(Instrument-Sensor) Type	Double Bellows
Manufacturer	Dwyer Instruments

Features

Bellows switch design provides sensitivity to pressure changes but resists vibration preventing out of range switching

External access to set and rest controls makes for easy adjustments

Visible set point indicators simplify changes

Dwyer DPS-233-2-64 Double Bellows Differential Pressure Switch

Erik Prayoga — Tue, 23 Jun 2026 02:18:21 +0000

Dwyer DPS-233-2-64 is a double bellows differential pressure switch with a temperature range of -10 to 180°F (-23 to 82°C). It has a general purpose, weatherproof or explosion-proof enclosure rating, screw terminal electrical connections, and a vertical mounting orientation. The wetted material is brass or 316SS, depending on the range. It has a maximum pressure limit and process connection options of 1/8" NPT female or 1/4" NPT male. The switch type can be mercury or snap switch, with thumbscrew set point adjustment. The conduit connection varies depending on the enclosure rating. Electrical rating details can be found on the ordering page.

Specifications

Component	Pressure Switch
(Instrument-Sensor) Temperature Range	-10 – 180°F/-23 – 82°C
(Instrument-Sensor) Type	Double Bellows
Manufacturer	Dwyer Instruments

Features

Bellows switch design provides sensitivity to pressure changes but resists vibration preventing out of range switching

External access to set and rest controls makes for easy adjustments

Visible set point indicators simplify changes

Dwyer DAW-7043-153-13E Bourdon Tube Pressure Switch

Erik Prayoga — Tue, 23 Jun 2026 02:18:20 +0000

Dwyer DAW-7043-153-13E is a Bourdon Tube Pressure Switch with a temperature range of up to 180°F (82°C). It is available in general purpose, weatherproof, and explosion-proof enclosures with screw terminal electrical connections. It can be mounted vertically and is made of brass, 403 SS, or 316 SS. It has a maximum pressure limit and various process connection options. The switch type can be SPST or SPDT with mercury or snap switch options. Set point adjustment is done with a thumbscrew and it has conduit connections for general purpose, weatherproof, and explosion-proof applications. Repeatability is ±1% of the full operating range and electrical rating can be found in the catalog.

Specifications

Component	Pressure Switch
(Instrument-Sensor) Type	Bourdon Tube
(Instrument-Sensor) Temperature Range	180°F/82°C
Manufacturer	Dwyer Instruments

Features

Visible calibrated dial provides an easy and fast check without having to open device causing dangerous conditions to operators

On/off indication (except hermetically sealed snap switch models) gives operator clear indication of state of switched equipment that could be located in another location

Adjustable or fixed deadband supports control applications by reducing equipment wear-out by unnecessary recycling

External switch set point adjustment reduces set-up time

Pressure ranges of full vacuum to 8000 psig gives application designers the ability to specify standard equipment, simplifying install and training, and reducing servicing costs

UL listed, CSA approved, many models FM approved to support rigorous process applications and regulations

General purpose, weatherproof or explosion-proof enclosures for a variety of indoor or outdoor environments meeting the needs of multiple applications and uses