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Dial Sizes 2-1/2", 3-1/2", 4-1/2" diameter
Four Case Styles
Accuracy ASME B40.1 - 2/1/2%

Marsh Instruments Diaphragm Steel Case Gauges are universally known for their dependable performance and accuracy. Incorporating a unique design feature, the diaphragm element in this gauge allows accurate low pressure readings in a variety of applications. Featuring a Bronze diaphragm element, the Gauge is capable of ASME Grade A-1 accuracy for ranges above 30" of water. Ranges are available in vacuum and in pressure in inches of water, ounces per square inch, and milimeters of mercury. Typical applications include HVAC systems and low pressure gas burner systems.

Marsh General Gauge Specifications:

ACCURACY

For Ranges 30" H20 and Above: ASME Grade A = ±2/1/2% (±1% of range across middle half of scale)
For Ranges Below 30" H20: ±3/1/3% (±1% of range across middle half of scale)

CASE SIZES 2-1/2", 3-1/2", 4-1/2 diameter

CASE MATERIAL Steel, black painted
CASE STYLE

CB – Center Back Mount
FF – Three Holed Front Flanged Mount
LM – Lower Mount
UC – U-Clamp Mount

DIAPHRAGM & SOCKET Phosphor Bronze
MOVEMENT Brass Sector and pinon
CONNECTION 1/8 & 1/4 NPT
DIAL STANDARD Dual Scale with kPa, Triple Scale with Oz/IN^2, IN H20, and kPa
DIAL COLOR Black markings on white
POINTER Aluminum, black painted
WINDOW

2-1/2", 3-1/2": acrylic, twist-in Clearlok
4-1/2": flat glass acrylic with steel friction ring

RESTRICTOR 0.013" Standard, No Restrictor for 0-10" H20 Range

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