Diaphragm Gauge - Series 400

The 400 Series Diaphragm Gauge is designed to operate below 15 psig. Because a typical Bourdon tube gauge becomes insensitive at this range, a diaphragm is used to greatly enhance the gauge's sensitivity--as low as 0-15" water column.

Typical Application

  • Indicating tank levels
  • Filters
  • Measuring draft
  • Regulating natural gas

Specifications and Features

  • Dial Size: 2.5"
  • Case: Steel, painted black
  • Ring: Steel, friction fit
  • Window: Glass
  • Pointer: Aluminum, black finish
  • Movement: Brass, precision geared
  • Diaphragm: Phosphor Bronze
  • Connections: 1/4" LM or 1/4" CBM Brass

Factory Stocked Gauges

    Model Selection Chart
Range 1/4" LM 1/4" CBM
0-15" H2O 0431-B31GN000 0431-B41GN000
0-30" H2O 0431-B31GP000 0431-B41GP000
0-60" H2O 0431-B31GR000 0431-B41GR000
0-100" H2O 0431-B31GT000 0431-B41GT000
0-160" H2O 0431-B31GU000 0431-B41GU000
0-200" H2O 0431-B31GV000 0431-B41GV000
0-300" H2O 0431-B31GW000 0431-B41GW000
0-15oz/sqin 0431-B31KP000 0431-B41KP000
0-30oz/sqin 0431-B31KQ000 0431-B41KQ000
0-60oz/sqin 0431-B31KR000 0431-B41KR000
20oz/35" H20 0431-B31KS000 0431-B41KS000
0-3psi 0431-B31GZ000 0431-B41GZ000
0-5psi 0431-B31HA000 0431-B41HA000
0-10psi 0431-B31HB000 0431-B41HB000


Mounting Styles and Dimensions

Steel Gauges

Dial Size A B R T
2 1/2" 2.48 1.48 1.2 1.51

Note: All Dimensions are shown in inches.