Pressure Gauges
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Diaphragm Gauges  |
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. |
| 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 |
| 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
|