- Official UK and Ireland channel partner
- UK technical support available
- Model selection and configuration support
Dwyer Series 4000 Capsuhelic Differential Pressure Gauge
Mechanical indication of pressure, vacuum and differential pressure on gas or liquid systems operating at static pressures up to 500 psig.
Key highlights
- High static pressure: Reads small differentials at up to 500 psig
- Versatile measurement: Pressure, vacuum or differential pressure indication
- Media options: Aluminium or brass housings for compatible gas or liquid service
- 4-inch dial: Clear local indication with external zero and range adjustment
- Flexible mounting: Surface, flush or optional pipe mounting
The Dwyer Series 4000 Capsuhelic is a mechanical differential pressure gauge designed to indicate pressure, vacuum or differential pressure in gas and liquid systems. Its integral pressure capsule contains the measured pressure within the instrument.
This design allows small pressure differences to be read on systems operating at static pressures up to 500 psig. It is intended for duties where system pressure, rather than the required differential span, rules out a conventional low-static-pressure gauge.
Housing selection depends on the process medium. The standard die-cast aluminium case is specified for air, compatible gases and oil-based liquids. Water and water-based liquids require the optional forged-brass housing, while wetted-material compatibility should be confirmed for the application.
A 4-inch dial provides clear local indication. External zero and range adjustments allow routine adjustment without opening the gauge, and duplicated high- and low-pressure connections support suitable routing for gas or liquid service.
Typical applications include filter pressure-drop monitoring, fluid-flow indication and liquid-level measurement in pressurised storage tanks, together with pressure or vacuum indication. Selection should account for pressure range, scale, housing material, diaphragm material and installation orientation.
Key Features
- Integral pressure capsule: Contains system pressure within the gauge for small differential-pressure readings at elevated static pressure
- Frictionless movement: Provides responsive mechanical indication without a liquid-filled measuring column
- External adjustment: Zero and range adjustments are accessible without routine disassembly
- Media-specific housings: Standard aluminium and optional forged-brass cases support the specified gas or liquid service
- Duplicated pressure taps: Separate upper and lower connection pairs assist correct installation for gas or liquid duties
- Mounting flexibility: Standard hardware supports surface or flush installation, with additional bracket and pipe-mounting accessories available
- Scale and calibration options: Standard, bidirectional and custom scales are available alongside signal-flag and NIST-traceable calibration options
Specifications
| Measurement and Performance | |
| Measurement functions | Pressure, vacuum or differential pressure |
| Indication | Mechanical, diaphragm-actuated local dial |
| Current catalogue ranges | Model dependent: 0-5 to 0-200 in w.c.; 5-0-5 or 15-0-15 in w.c.; 0-5 to 0-20 psid; 0-16 or 0-35 ft w.c. |
| Accuracy | ±3% of full scale at 21.1°C (70°F) for standard models; ±2% on 4000S models; ±4% on models 4200, 4210, 4215, 4220, 4300, 4400 and 4500 |
| Pressure limits | -20 in Hg to 500 psig (-0.677 to 34.4 bar) |
| Media, Construction and Environment | |
| Standard aluminium-case service | Air, compatible gases and oil-based liquids |
| Brass-case service | Air, compatible gases and water-based liquids; forged-brass housing required for water or water-based fluids |
| Housing | Die-cast aluminium with impregnated hard coating as standard; optional forged brass |
| Wetted materials | Application dependent; consult DwyerOmega |
| Temperature limits | -6.67 to 93.3°C (20 to 200°F) |
| Dial diameter | 4 in (101.6 mm) |
| Weight | 1.45 kg aluminium case; 3.54 kg brass case |
| Connections and Installation | |
| Process connections | 1/4 in female NPT high- and low-pressure taps, duplicated |
| Connection arrangement | Upper pair for air and gas service; lower pair for liquid service |
| Mounting orientation | Diaphragm vertical as standard; consult DwyerOmega for other orientations |
| Mounting methods | Surface or flush mounting with standard hardware; optional brackets and pipe-mounting kit available |
| Options and Compatibility | |
| Brass case | Suffix B; required for water or water-based fluids |
| Adjustable signal flag | Suffix -ASF |
| Calibration certificate | Optional NIST-traceable calibration certificate, suffix -NIST |
| Scale options | Red, green, mirrored or combination overlays; custom scales for flow, height and other requirements |
| Diaphragm options | Special materials available; consult DwyerOmega |
| Hydrogen service | For pressures below 35 psi when ordered with a Buna-N diaphragm |
| Compliance | |
| RoHS status | Manufacturer-listed compliance with EU Directives 2011/65/EU and 2015/863 |
Scope of Delivery
- Configured Series 4000 Capsuhelic differential pressure gauge
- Two 1/4 in NPT plugs for the duplicate pressure taps
- Four flush-mounting adapters with screws
- Four surface-mounting screws
Support
Able Instruments are an official UK and Ireland channel partner for DwyerOmega, providing application advice, configuration support and quotation assistance for the Series 4000 Capsuhelic family.
- Model selection: Support choosing the correct pressure range, scale and housing configuration
- Option compatibility: Checks for brass case, -ASF, -NIST, scale and diaphragm options
- Installation support: Advice on mounting orientation, pressure connections and compatible accessories
- Documentation support: Help confirming NIST-traceable calibration certificate requirements
Accessories
- A-298 flat flush mounting bracket
- A-314 bleed fitting
- A-370 mounting bracket
- A-496 flush mount bracket
- A-610 pipe mount kit