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• Dial Sizes2-1/2″, 3-1/2″, 4-1/2” diameter
• Four Case Styles
• Accuracy ASME B40.1 – 2/1/2%

Marsh Instruments DiaphragmSteel 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 glassacrylic with steel friction ring
• RESTRICTOR 0.013″ Standard, No Restrictor for 0-10″ H20 Range

Also See:

• Marsh Bellofram Severe Service Gauge – 2.5″ / 63mm Face, Liquid Filled, 1/4″ NPT Bottom Mount
• Marsh Bellofram Severe Service Gauge – 2.5″ / 63mm Face, Liquid Filled, 1/4″ NPT Center Back Mount
• Marsh Bellofram Severe Service Gauge – 2.5″ / 63mm Face, Liquid Filled, 1/4″ NPT Lower Back U-Clamp
• Marsh Bellofram General Gauge – 2″ Dial, 1/4″ NPT Center Back Mount
• Marsh Bellofram General Gauge – 2-1/2″ Dial, 1/4″ NPT Bottom Mount
• Marsh Bellofram Precision Gauge

Resources:

• Marsh Bellofram Diaphragm Gauge Datasheet
• Marsh Bellofram Product Memorandom in relation to California Proposition 65

0 to 15 in H2O (vacuum) 250LPB-15WV 251LPB-15WV 0 to 32 in H2O (vacuum) 250LPB-32WV 251LPB-32WV 0 to 55 in H2O (vacuum) 250LPB-55WV 251LPB-55WV 0 to 100 in H2O (vacuum) 250LPB-100WV 251LPB-100WV 0 to 15 in H2O/oz (pressure) 250LPB-15WO 251LPB-15WO 0 to 32 in H2O/oz (pressure) 250LPB-32WO 251LPB-32WO 0 to 55 in H2O/oz (pressure) 250LPB-55WO 251LPB-55WO 0 to 100 in H2O/oz (pressure) 250LPB-100WO 251LPB-100WO 0 to 200 in H2O/oz (pressure) 250LPB-200WO 251LPB-200WO 0 to 5 psi/kPa (pressure) 250LPB-5PSI 251LPB-5PSI 0 to 10 psi/kPa (pressure) 250LPB-10PSI 251LPB-10PSI 250 LPB 250LP