Dwyer A3300-250PA Photohelic Pressure Switch Gauge

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Dwyer A3300-250PA Photohelic Pressure Switch Gauge

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Dwyer A3300-250PA Photohelic Pressure Switch Gauge Specification

Sensor Type
Photohelic (Photoelectric Switch and Gauge Combination)

Seal Material
Silicone rubber

Grade
Industrial

Outer Size
Gauge Size: 4 inches (101 mm) OD

Display
Analog

Thread
Standard Panel Mount Threading

Material
Die-cast aluminum case, polycarbonate lens

Dial Material
White aluminum with black markings

Pointer Material
Black aluminum

Processing Type
Electromechanical assembly

Diameter
Approx. 4 inches (101 mm)

Glass Size
Full front, clear acrylic lens

Mount Type
Flush mount, panel mount

Scale Range
0 to 250 Pa (Pascals)

Accuracy
2% of full scale

Finishing
Standard factory finish

Measure Pressure Of
Low air or non-corrosive gas pressure

Accessories
Mounting hardware, instruction manual

Dwyer A3300-250PA Photohelic Pressure Switch Gauge Trade Information

FOB Port
Delhi

Payment Terms
Cash on Delivery (COD), Cash Against Delivery (CAD), Cash in Advance (CID), Cash Advance (CA)

Supply Ability
5 Per Week

Delivery Time
5-6 Week

Main Export Market(s)
Middle East, Asia

Main Domestic Market
Dadra and Nagar Haveli, Andaman and Nicobar Islands, Uttarakhand, Daman and Diu, Lakshadweep, South India, East India, Assam, Arunachal Pradesh, Bihar, Chandigarh, Delhi, Gujarat, Goa, Himachal Pradesh, Jammu and Kashmir, Karnataka, Maharashtra, Mizoram, Meghalaya, Manipur, Punjab, Pondicherry, Rajasthan, Nagaland, Uttar Pradesh, Sikkim, Tamil Nadu, Telangana, Tripura, Haryana, West Bengal, Madhya Pradesh, North India, Andhra Pradesh, Kerala, Central India, Odisha, Jharkhand, West India, Chhattisgarh, All India

Certifications
Websites : www.dpengineers.in www.dpengineer.in www.dpengineers.co.in www.dpengineer.co.in www.dpengineersindia.com www.dpengineerindia.com www.dpengineersindia.in www.dpengineers.info www.dpengineer.info www.dp-engineers.com www.dpengineerindia.in www.dpengineersindia.net www.dpengineersdelhi.co.in www.dpengineersdelhi.com www.dpengineersdelhi.net

About Dwyer A3300-250PA Photohelic Pressure Switch Gauge

Dwyer A3300-250PA Photohelic Pressure Switch Gauge Range 125-0-125 Pa.

Dwyer A3300-250PA Photohelic Pressure Switch/Gauge (125-0-125 Pa.)

Model: A3300-250PA

Bezel and front cover (with set point knobs and zero adjustment screw) removed to expose Photohelic Switch/Gage set point

Mechanism. Cover is Clear Polycarbonate Plastic.Gage Pointer and Light Shutter Are Mounted on Helix and Balancing

Counterweight.

Dwyer A3300-250PA Offers

Features

Measure 4 to 20 mA Signals Without "Breaking the Loop"
Measure mA Signals For PLC and Control System Analog I/O
Dual Backlit Display With Both mA Measurement And Percent of 4 to 20 mA Span
Measurement Spotlight illuminates hard to see wires in dark enclosures
Detachable clamp with extension cable for measurements in tight locations
Measure 10 to 50 mA signals in older control systems using the 99.9 mA range
Automatically change the 4 to 20 mA output for remote testing
Power saving features,auto-off, backlight timeout extend battery life
Hold function captures and displays changing measurements

Applications

Air Conditioner Systems
Clean Rooms
Fume Exhaust Systems
Dwyer A3300-250PA Specifications

Switch Specifications

Switch Type:Each Set Point Has 2 Form C Relays (DPDT)
Repeatability:1% of FS
Electrical Rating:10 A at 28 VDC,10 A at 120,240 VAC
Electrical Connections:Screw Terminals. Use 167F (75C) Copper Conductors Only
Power Requirements:120 VAC, 50/60 Hz,240 VAC and 24 VAC power optional
Mounting Orientation:Diaphragm in Vertical Position. Consult Factory For Other Position Orientations
Set Point Adjustment:Adjustable Knobs On Face
Agency Approvals:CE,CSA,UL

Gauge Specifications

Service:Air And Non Combustible,Compatible Gases
Accuracy:2% of FS at 70F (21.1C),3% on -0,4% on -00 models
Pressure Limits:-20" Hg to 25 psig(-0.677 to 1.72 bar),MP option; 35 psig (2.41 bar),HP option; 80 psig (5.52 bar)
Temperature Limits:20 to 120F.(-6.67 to 48.9C),-20 to 120F(-28 to 48.9C)with low temperature option
Process Connections:female NPT
Dimensions:4"(101.6 mm) Dial Face,5 x 8"(127 x 209.55 MM)
Weight:4 lb (1.81 kg)

Precision Measurement and Dual Switching in One Instrument

With its integrated photoelectric sensor and gauge, the A3300-250PA delivers both real-time analog pressure readings and dual SPDT relay outputs. This allows users to monitor and automate pressure-dependent processes safely and efficiently, providing control flexibility over alarms, fans, or dampers in HVAC, cleanrooms, or industrial automation setups.

Designed for Industrial and Process Applications

Engineered for demanding environments, the A3300-250PA withstands maximum pressures up to 10 psi and operates reliably between 0C and 60C. Its die-cast aluminum housing, polycarbonate front cover, and robust sealing allow it to excel in dust-prone or moderately moist conditions, supported by its IP54 rated enclosure and external set point adjustment functionality.

FAQs of Dwyer A3300-250PA Photohelic Pressure Switch Gauge:

Q: How do I install the Dwyer A3300-250PA Photohelic Pressure Switch Gauge?

A: The A3300-250PA is designed for flush or panel mounting through a standard 4-inch panel hole. Secure the gauge using the included mounting hardware, ensure correct wiring connections via the screw terminals, and mount it vertically for optimal performance.

Q: What types of gases or media can be measured with this gauge?

A: This gauge is intended for low-pressure measurement of air or other non-corrosive gases. It is not compatible with liquids or corrosive media, as this may damage the sensor and housing.

Q: When should I use the dual SPDT relay set points?

A: Dual SPDT relay set points are useful when you need to control multiple devices or create high and low alarm thresholds. Set each relay to activate at your preferred pressure, controlling fans, alarms, or other systems based on real-time readings.

Q: Where can the A3300-250PA be typically used?

A: The gauge is suitable for industrial, commercial, and laboratory environments, such as HVAC systems, clean rooms, filter monitoring, or any low-pressure air monitoring applications that require reliable pressure indication and switching.

Q: What is the benefit of using external knobs for set point adjustment?

A: External set point knobs allow users to adjust pressure switch thresholds easily without opening the enclosure, providing quick tuning and minimizing process downtime.

Q: How does the instantaneous electronic response enhance usage?

A: The instantaneous (electronic) response of the gauge ensures immediate relay actuation when set points are reached, enabling precise and timely process control, crucial for sensitive applications like air handling and filtration systems.

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