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.



