Howell Laboratories, Inc.

P. O. Box 389, 188 Harrison Rd., Bridgton Maine 04009 USA

(207) 647-3327	(888) 744-8359	FAX (207) 647-8273	contracts@howelllabs.com

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Certified to ISO 9001:2000

Model 4870

Low-Pressure (80 - 150 psig) Air Control Panel

General Description:

The Model 4870 Low-Pressure Air Control Panel is designed to control the pressure and to monitor the flow rate and moisture content of clean, dry compressed air to electronic equipment and components. The panel is designed for either automatic or manual operation.

Air pressure is regulated by two (or, for the Type III, one) pressure regulators. Flow rate of air being delivered to the using equipment is measured by a direct-reading float-in-tube flowmeter. A humidity alarm system monitors the moisture content of the air passing through the panel and energizes a local alarm if the moisture level rises above a preset value of -15° F dew point at 80 psig.

Configurations other than those shown here may be special-ordered.

Operating Characteristics by Type:

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U.S. Navy Type and Class:	IA	IB	IC	IIA	IIB	III
Inlet Pressure:	-- 80 - 150 psig --
Intermediate Pressure, psig (± 2 psi)	50	50	50	70	70	75
Outlet Pressure, psig (± 1/4 psi)	0 - 10	10 - 20	20 - 30	25 - 40	40 - 60	n/a
Flow, scfm:	0 - 10	0 - 10	0 - 10	0 - 10	0 - 10	0 - 15
Dew Point Alarm:	-- -15° F @ 80 psig --
Relief Valve Setting:	-- Outlet + 3 to 5 psi --			-- Outlet + 10% psi --

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Specifications:

• Manufactured in accordance with NAVSHIPS Standard Drawing 803-1385925 Rev. C.
• Bypass: A manual bypass valve is provided to allow continued operation in the event of malfunction of any of the automatic components.
• Relief Valve: Preset adjustable relief valve protects downstream equipment from overpressurization.
• Dimensions: 30" W x 17" H x 9-1/2" D.
• Weight: 70 lb (110 lb crated).
• Operation: Either automatic or manual, continuous or intermittent.
• Power Requirements: 115 VAC, 60 Hz, single-phase, 1/4 amp.
• Air Requirements: Clean, dry compressed air at 80 to 150 psig.
• Filter: Prevents introduction of any particulates larger than 25 microns.
• Calibration: External ports are provided for calibration of the dew point alarm system and of pressure gauges.

Controls & Indicators:

• Purge/test valve
• Inlet, intermediate & outlet pressure gauges
• Inlet & outlet shutoff valves
• Humidity alarm system
• Test switch
• Emergency shutoff valves
• Intermediate & outlet pressure regulators

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Last updated: 04/18/2008 Webmaster: Al Friend © 1999-2008 Howell Laboratories, Inc. All rights reserved.		Printable Adobe Acrobat version
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