The 476A series digital manometers can be used to measure low pressures from -20 to 20 "w.c. with ±1.5% FS accuracy. The 478A digital manometers can be used to measure positive, negative, or differential pressures. Both are constructed of an extruded aluminum case for exceptional durability.

Precision machined 1" thick solid acrylic plastic, virtually unbreakable and free of distortion. The fluid bore is precision drilled to ±0.0002" to assure life long accuracy. The scale is mirror polished chrome plated brass to assure parallax free reading by alignment of the meniscus with its reflection.

Dwyer solid plastic portable manometers are precision instruments in inclined and vertical (well-type) styles for the measurement of static pressure, vacuum or differential pressure. Suitable for Total Pressures Up to 100 psig, Temperatures Up to 150°F, Accuracy ±2% of Full Scale (1% on Model 115 Only).

As accurate as the finest laboratory "U" gauges - yet they are made to roll up compactly for easy carrying and to withstand rough usage.

These Manometers combine the inherent accuracy of the simple "U" Tube with the durability of tough, long-lasting plastic construction. Columns are of .375" O.D. flexible and shatter proof clear butyrate tubing. Stark white scales have graduations and numbers silkscreen-printed in black for maximum legibility.

Designed to meet the need for a direct reading single column instrument providing highly accurate pressure readings; positive, negative or differential. Dwyer manometers have no hidden wells or packing glands. These are constructed of shatter-proof clear plastic tubing permanently bonded to well assemblies with leak-proof glued joints.

Designed specifically for flow measurement of dirty, particulate laden air or gas streams. Large 5/16" dia. stainless steel tubing resists plugging under harsh, sooty conditions which quickly block conventional flow sensors. Total and static pressure tubes are precisely aligned and welded together every six inches.

Quickly indicates low air or non-corrosive gas pressures either positive, negative (vacuum) or differential. The design resists shock, vibration and over-pressures. No manometer fluid to evaporate, freeze or cause toxic or leveling problems. May be used with Hydrogen; order a Buna-N diaphragm, pressures must be less than 35 psi.

Designed to give fast, accurate indication of differential pressures. The gauge may be used as a readout device when measuring flowing fluids, pressure drop across filters, liquid levels in storage tanks and many other applications involving pressure, vacuum or differential pressure.

This compact gauge is easy to read and can safely operate at total pressures up to 30 psig. Standard pressure connections are barbed fittings for 3/16" ID tubing; optional 1/8" male NPT connections are also available. Over-pressure protection is built in by means of a blow-out membrane molded in conjunction with the diaphragm.

For air and non-combustible compatible gases, Series 1900 switches have set points from 0.07 to 20" w.c. (1.8 to 508 mm). Set point adjustment is easy with range screw located inside conduit enclosure and prevents tampering. UL, CE and CSA listed, and FM approved.

This high precision large diaphragm pressure switch incorporates a visible set point indicator for maximum convenience. UL and CSA listed, FM approved for general service, these switches are suitable for most applications in air conditioning and industrial service. Electrical capability of 15 amps handles most small electrical loads.

The 1640 is equipped with a single pole, double throw floating contact switch (not snap acting) so it functions as a null switch. As the diaphragm moves in response to pressure changes, it moves the floating contact to cause switching action at two preset points with no switching action between these points.

Featuring a compact switch with 2% repeatability for enough accuracy for all but the most demanding applications. Set point adjustment inside the mounting stud permits mounting switch on one side of a wall or panel with adjustment easily accessible on the opposite side. UL and CSA listed, and FM approved.

CE, UL and CSA listed, FM approved for use in Class I, Div 1, Groups C and D, Class II Groups E, F, and G and Class III hazardous atmospheres NEMA 7 & 9. Raintight NEMA 3 (IP54). Weatherproof features include a drain plug and O-ring seal in cover. Series offers set points from 0.03 to 20" w.c. (7.5 to 5 kPa) and from 0.5 to 60 psi (0.035 to 3.5 bar).

UL listed for use in Class I, Groups A, B, C, & D; Class II, Groups E, F, & G and Class III atmospheres, Directive 94/9/EC (ATEX) Compliant for CE ATEX II 2G Exd IIB+H2 T6, CSA & FM approved for Class I, Div. 1, Groups B, C, D; Class II, Div. 1, Groups E, F, G and Class III atmospheres IECEx Ex d IIB+H2 T6 (-40°C < Ta < 60°C).

Switch setting is easy to adjust with large external knobs on the gauge face. Gauge reading is unaffected by switch operation - will indicate accurately even if power is interrupted. Solid state design now results in greatly reduced size and weight. Units can be flush mounted in 4-13/16" (122 mm) hole or surface mounted with hardware supplied.

Same rugged construction as used in Series 1000W plus explosion-proof design are combined in this unit. UL listed for Class I, Groups A, B, C and D; Class II, Groups E, F and G. Bellville spring movement permits mounting of control in any position and helps prevent contact chatter. Features Visible Setpoint, Fixed Deadband, and Ranges to 1400psi.