Designed for pressure measurements as low as a few inches of water, these gauges, in spans from 30" H2O to 10 psi utilize a unique sensing element. It is composed of a stack of diaphragm capsules, each consisting of two plates contoured into a convex-concave configuration to nest into one another. This results in a low internal volume element developing large forces to drive the mechanism in extremely low pressure ranges. The measuring element may be filled and attached to a Mansfield & Green diaphragm seal (Type L) to permit use of the gauge with corrosive or viscous fluids. Calibration adjustments (scale shape and linearity) are made from rear of case without removing internals. The pointer is adjusted by removing the front ring and window.

Specifications

Dial Size: 4 1/2"

Case and Ring: For Stem or Wall Mounting - PHENOLIC TURRET CASE (black) with glass-filled, threaded, polypropylene ring and plastic pressure-relieving back. (Figures 1919, 1929)

Window: Acrylic

Pointer: Knife-edged, micrometer adjustable, black finish.

Dial: Aluminum with white background and black markings.

Movement: Heavy brass "U" frame construction with nickel silver rocker arm on stainless steel pivots. Brass sector and nickel silver pinion operate on brass bearings. Minimum and maximum stops prevent segment and pinion disengagement.

Diaphragm: 1919-NiSpan "C", silver brazed; 1929-316 st. stl., heli-arc welded.

Connection: 1919-Brass; 1929-316 st. stl. 1/2" NPT Standard (1/4" NPT optional)

Accuracy: ± 1% of span (Grade A).

STANDARD DIAL RANGES

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