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Dwyer A3000 Photohelic Pressure Switch
Dwyer A3000 Photohelic Pressure Switch is a combination differential pressure gauge and pressure switch designed for accurate monitoring and control of air and compatible gases. It provides both local visual indication and automatic control output, making it ideal for HVAC systems, cleanrooms, and industrial air handling applications.
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Categories: Pressure Gauges
Description
The Dwyer A3000 Photohelic Pressure Switch integrates a Magnehelic-type mechanical pressure gauge with dual high and low setpoint switches in a single unit. It measures low differential pressure using a diaphragm-based system and displays the value on a clear analog dial while simultaneously providing switch outputs for control functions. The setpoints are fully adjustable and allow users to trigger alarms or control equipment such as fans, dampers, or filters when pressure exceeds or drops below defined limits. This dual-function design eliminates the need for separate gauge and switch installations, reducing system complexity and cost.
In addition, the device features a rugged die-cast aluminum housing with a clear acrylic lens for durability and visibility in industrial environments. It offers reliable snap-action switching for consistent performance and long service life with minimal maintenance. The A3000 is suitable for panel mounting and supports a wide range of low-pressure scales, making it highly versatile for HVAC and process air monitoring applications. Its combination of indication and control in one compact instrument makes it a widely used solution in air management systems.
QTech Safety is a leading supplier of Dwyer A3000 Photohelic Pressure Switch in Ireland, offering competitive prices and fast worldwide shipping across United Kingdom (UK), Germany, France, Italy, Spain, United States USA, Canada, Mexico, and Western Australia (Perth). Buy Dwyer Instruments Pressure Gauge from one of Ireland’s most trusted industrial safety equipment suppliers.
Features of Dwyer A3000 Photohelic Pressure Switch
- 3-in-1 Indicating Gauge, Lo-Limit and Hi-Limit Control
- For use with air and non-combustible gases
- Ranges: to 150 inH2O, 30 psi, 8 kPa, 80 mmH2O, or 80 cmH2O. Some bidirectional ranges available
- Accuracy: up to ±2% of FS at 70°F
- 1/8″ female NPT process connection
- Zero adjustment screw
- 4″ dial face
- Pressure Switches: 2 Form C relays (DPDT) for each setpoint
- Set Point Adjustment: Adjustable knobs on face
- Repeatability: ±1% of FS
- CE, CSA, UL approved. Optional-EXPL explosion-proof enclosure does not possess any agency approvals
Technical Specifications of Dwyer A3000
- Type: Differential pressure gauge with dual pressure switch
- Measurement range: Low differential pressure ranges (e.g., 0–0.25 to 0–100 in. w.c.)
- Switch type: SPDT snap-action switches (high and low setpoints)
- Accuracy: ±2% full scale (gauge)
- Operating temperature: -6.7 to 60 °C (20 to 140 °F)
- Media compatibility: Air and non-combustible, compatible gases
- Maximum pressure: 15 psig (1.03 bar)
- Electrical rating: Typically up to 15 A @ 120–240 VAC (switch dependent)
- Process connection: 1/8″ NPT female (dual ports)
- Case material: Die-cast aluminum
- Lens material: Clear acrylic
- Mounting: Panel mount
- Adjustment: External adjustable high and low setpoints + zero adjustment
Pressure Gauges Part Number & Configuration Guide
Standard (Example) Part Number
A3201
This is a reference configuration for the Dwyer Instruments Pressure Gauges. It represents one commonly supplied setup and helps customers understand how the part number is structured.
Configurable Part Number Format
A3XXX - XXX
Each X / XX in the part number indicates a selectable option that can be customized based on your application requirements such as Pressure Type, Connection Type, Pressure Range & Transmitter Output.
✅ Important: Final part number depends on the exact configuration needed for your machinery, environment, and monitoring system.
Applications
The Dwyer A3000 Photohelic Pressure Switch is commonly used in industrial calibration and testing applications, including:
- HVAC duct and airflow monitoring
- Air filter condition indication
- Cleanroom pressure monitoring
- Fan and blower pressure measurement
- Industrial ventilation systems
Why Choose QTech Safety?
At QTech Safety, we’re more than just a safety supplier we’re your trusted partner in workplace protection and compliance.
Here’s why companies across UK and Ireland (EU) choose us for safety products and training:
- Comprehensive Range of Safety Equipment:
From gas detection and PPE to industrial safety tools, we offer one of the widest selections of trusted brands all at competitive Irish market prices. - Test & Measurement Instruments You Can Trust:
We supply a wide range of test and measurement instruments from the most leading and trusted brands, including industrial sensors, multimeters, oscilloscopes, accelerometers, proximity sensors, and other advanced measurement tools to support accurate diagnostics, condition monitoring, calibration, and maintenance applications. - Expert Health & Safety Training:
We provide professional health and safety training programmes designed to help your workforce stay compliant and confident on the job. - Fast, Reliable Delivery Worldwide:
Whether you’re in Texas United States or Perth Western Australia, our fast delivery service ensures you get your safety equipment quickly and efficiently. - Trusted by European Businesses:
We’re proud to support industries across Europe (UK) with certified safety solutions, expert advice, and responsive customer service.
We Ship Worldwide
At QTech Safety, we supply industrial sensors and instrumentation across Ireland, offering fast and reliable worldwide delivery. Through strong global logistics partnerships, we ensure efficient shipping and professional support for customers in Europe, North America, and Australia.
🡆 Europe (United Kingdom, Ireland, Germany, France, Italy, Spain, and the rest of European Union)
🡆 Australia (Western Australia WA, Queensland QLD, and New South Wales NSW)
🡆 North America (United States, Canada, Mexico)
