Dwyer Instruments is a leading manufacturer of precision controls and instrumentation for HVAC, process automation, and industrial applications globally.
Offerynnau Dwyer, Inc. is a trusted global leader in the design and manufacture of controls, sensors, and instrumentation solutions. Serving critical industries including HVAC, chemical processing, food and beverage, oil and gas, and pollution control, Dwyer is renowned for its precision and reliability. The company's diverse product portfolio features the iconic Magnehelic® differential pressure gages, Photohelic® switch/gages, digital manometers, flowmeters, and transmitters.
With a strong focus on innovation and customer application, Dwyer continues to develop products that improve safety, efficiency, and operational control in industrial environments. Now part of the DwyerOmega family, the brand maintains its commitment to quality engineering and robust support for engineers and technicians worldwide.
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To zero the gage, ensure both high and low pressure taps are open to the atmosphere. Use the zero adjust screw located at the bottom of the front cover to align the pointer exactly on the zero mark.
The Series 477AV typically requires a standard 9V alkaline battery. Battery replacement involves removing the bottom end-cap marked BATTERY.
Yes, for vacuum air service, the inlet piping should be as short and open as possible to allow operation near atmospheric pressure. If a flow control valve is used, it should be placed on the discharge side of the flowmeter.
The Series 655A is not position sensitive, but for best accuracy, it is recommended that zeroing and spanning be performed while the unit is in the vertical position with pressure connections horizontal.
Normally, the only maintenance required is occasional cleaning with mild soap and water to ensure good float visibility. Avoid using solvents like benzene or acetone, which may damage the body.