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Marsh BelloframDiaphragm Gauges
Diaphragm Gauge
Diaphragm gauge cutaway
Marsh Instruments Low Pressure Diaphragm Gauges are universally known for their dependable performance and accuracy. Incorporating a unique design feature, the diaphragm element 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 pressure in inches of water, ounces per square inch and millimeters of mercury.

Typical applications include HVAC systems and low pressure gas burner systems
.

Specifications

Accuracy For ranges 30" H20 & 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 diaphragm
soft-soldered to brass socket
Movement Brass sector and pinion with
polycarbonate top & bottom plates
Connection 1/8" or 1/4 " NPT
Dial Standard Dual Scale with kPa
Triple Scale: oz/in2, in H20, & kPa
Dial Color Black markings on white
Pointer Aluminum, painted black
Window 2-1/2" & 3-1/2": twist-in Clearlok acrylic
4-1/2": flat acrylic with steel friction ring
Restrictor 0.013" standard. No restrictor on 0 to 10" H2O range

Part Numbers

2-1/2", 3-1/2" & 4-1/2" Diaphragm Gauges part listing
Size
2-1/2"
3-1/2"
4-1/2"
Case Material
Steel
Steel
Internal
Copper Alloy
Copper Alloy
Mounting/Case
LM
LM
U
U
CB
CB
FF
LM
LM
Connection
1⁄4" NPT
1⁄8" NPT
1⁄4" NPT
1⁄8" NPT
1⁄4" NPT
1⁄8" NPT
1⁄4" NPT
1⁄4" NPT
1⁄4" NPT
0 to 10" H20
G22675
G22711
G11181
G11248
G22747
G27110
G11578
G24608
G25756
0 to 15" H20
G24500
G24503
G11246
G11313
G26504
G30237
G11642
G24631
G25981
0 to 30" H20
G22704
G22740
G11189
G11256
G22776
G11652
G11586
G24625
G25749
0 to 60" H20
G22705
G22741
G11208
G11314
G22777
G11671
G11605
G24626
G25844
0 to 100" H20
G22687
G22723
G11217
G11284
G22759
G11675
G11609
G24613
G25982
0 to 160" H20
G22695
G22731
G11232
G11299
G22767
G11695
G11628
G24617
G25980
0 to 200" H20
G22696
G22732
G11233
G11300
G22768
G11696
G33412
G24618
G26021
0 to 300" H20
G22697
G22733
G11236
G11303
G22769
G11699
G33413
G24619
G25755
0 to 3 psi
G22685
G22721
G11215
G11282
G22757
G11678
G11612
G24612
G33414
0 to 5 psi
G22702
G22738
G10623
G11310
G22774
G22810
G10619
G24624
G26018
0 to 10 psi
G22699
G22735
G11239
G11306
G22771
G11702
G11635
G24621
G25754
0 to 10 oz/in2
G22677
G22713
G11186
G11253
G22749
G11649
G11583
G24609
G33415
0 to 15 oz/in2
G22680
G22716
G11194
G11261
G22752
G11657
G11591
G24610
G25753
0 to 30 oz/in2
G24501
G33404
G11206
G11273
G24504
G11669
G11603
G24632
G25750
0 to 60 oz/in2
G22684
G22720
G11213
G11280
G22756
G11676
G11610
G24611
G25757
0 to 100 oz/in2
G22691
G22727
G11226
G11293
G22763
G33411
G11622
G24615
G26025
0 to 160 oz/in2
G26062
G33405
G11237
G11304
G33410
G11700
G11633
G26894
G33416
8.75 oz/in2 and 15" H20
G22706
G22742
G11185
G11252
G22778
G11648
G11582
G24627
G33417
20 oz/in2 and 35" H20
G22709
G22745
G11200
G11267
G22781
G11663
G11597
G24629
G25748
32 oz/in2 and 55" H20
G22707
G22743
G11195
G11262
G22779
G11658
G11592
G24628
G25984
58 oz/in2 and 100" H20
G22710
G22746
G11214
G11281
G22782
G22947
G11611
G24630
G33418
0 to 15" H20 VAC
G22912
G33406
G11873
G11906
G22942
G12104
G12071
G24708
G26023
0 to 30" H20 VAC
G22914
G29804
G11876
G11909
G22944
G12107
G12074
G24709
G26020
0 to 60" H20 VAC
G22918
G33407
G11884
G11917
G22948
G12115
G12082
G24710
G26016
0 to 100" H20 VAC
G24502
G26962
G11885
G11918
G22949
G12116
G12083
G24716
G26019
0 to 200" H20 VAC
G22921
G33409
G11892
G11925
G22951
G12123
G12090
G24711
G33420
Shaded part numbers are available by special order and may require minimum quantities.

Contact Us!

ShermanInstruments
John Sherman Agencies Limited
1641 Venables Street
Vancouver, BC, Canada
V5L 2H1

Phone: 604-254-9622 or toll free 877-251-9622
Fax: 604-254-3123

e-mail: info@johnsherman.com


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