DWYER INSTRUMENTS 477B-7 Handheld Digital Manometer

Dwyer Instruments 477B-7 handheld digital manometer measures the pressure and flows in a patient's airway. Because the manometer is extremely precise, it is frequently used as a calibration standard, ideal for applications in HVAC system maintenance, fluid flow measurements and commercial furnace gas valve pressure measurement applications. This digital manometer is a portable, handheld meter that can monitor small changes in differential pressure.

Working Mechanism:

• A metal cylinder is a part of a metre.
• When measuring gas or fluid, the meter's springy cylinder is depressed.
• The cylinder is then bent, turning it into a metre, thus allowing the user to read the result.

Features:

• Dwyer 477B-7 handheld digital manometer measures dual and single pressures.
• This 9V alkaline battery-operated unit has an accuracy of +/-0.1% of full scale from 60 degrees to 78 degrees Fahrenheit for measuring negative, positive or differential pressures.
• It allows up to 40 readings that may be stored in the memory function for subsequent retrieval.
• The unit has a backlight that offers extra brightness for difficult-to-see areas.
• It also includes a hold function and both visible & auditory overpressure alerts.
• This model features an aluminium housing to protect the instrument against damage.
• It is supplied with a 4-digit LCD display for easy readings.

Compatible Accessories:

• Dwyer Instruments A-402A Pouch: These carrying cases feature tough grey nylon construction to protect the manometers. They are double zippered for quick and easy access with a belt loop that snaps closed.
• Dwyer A-47X-BOOT Rubber Boots: They are protective magnetic rubber boots and are used with the manometers.

Standards and Approvals:

• CE

Frequently Asked Questions:

Q. What pressure does a manometer measure?

A. Manometers are precise devices used to measure pressure which is defined as the force produced by a gas or liquid per unit of surface area due to the effects of gravity on the weight of that gas or liquid.

Q. What liquid is used in a manometer?

A. The most common fluids are alcohol, water and mercury.

Q. Why is alcohol used in a manometer?

A. Because of its low density, alcohol allows for a longer column than other fluids in manometers. It also gives the inclined tube a proper meniscus.