Dwyer Series A3000 Photohelic® Differential Pressure Switch/Gage

This document provides comprehensive specifications, installation, and operating instructions for the Dwyer Series A3000 Photohelic® Differential Pressure Switch/Gage. This versatile instrument combines a proven differential pressure gauge with low/high pressure switches, designed for measuring and controlling air or compatible non-corrosive gases.

Key features include easily adjustable switch set points visible on the gage face, DPDT relays for control, and robust construction suitable for various industrial applications.

Key Features & Specifications

Measures and controls positive, negative, or differential pressure.
Accuracy: ±2% of full scale.
Pressure Limits: -20" Hg. to 25 psig (standard).
Temperature Range: 20 to 120°F.
Electrical Rating: 10A @ 28 VDC, 10A @ 120/240 VAC.
Agency Approvals: UL, CSA, CE.

Detailed guidance is provided for selecting the optimal location, proper mounting (panel or surface), and making pneumatic and electrical connections. The document outlines various circuit styles for automatic and manual reset operations, as well as high/low limit control configurations.

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Key Features & Specifications

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