- Official UK and Ireland channel partner
- UK technical support available
- Model selection and configuration support
Dwyer Series 2000 Magnehelic Differential Pressure Gauge
Provides clear local indication of low differential pressure for air and compatible non-combustible gases in HVAC, filter monitoring and cleanroom applications.
Key highlights
- No external power: Standard mechanical models require no electrical supply
- Flexible measurement: Positive, negative and differential pressure configurations available
- Large dial: 101.6 mm (4 in) face for clear visual checks
- IP67 protection: Weatherproof enclosure protects against dust and water ingress
- Series options: High accuracy, local LED indication and higher total pressure ratings
The Dwyer Series 2000 Magnehelic is a mechanical low differential pressure gauge for local indication of positive, negative or differential pressure in air and compatible non-combustible gases. Its diaphragm and frictionless magnetic movement convert small pressure changes into pointer movement without conventional mechanical linkages.
It gives operators an immediate visual reading for air filter monitoring, blower vacuum, fan pressure, HVAC duct pressure and pressure relationships between rooms or cleanrooms. Air velocity scales are also available for use with a suitable Dwyer pitot tube.
A broad choice of pressure ranges, engineering units and scale formats allows the gauge to be matched to the application. Configurations include positive, negative, off-zero and zero-centre scales, together with dual-unit and air velocity formats.
The Series 2000 family includes options for higher accuracy, local LED setpoint indication and increased total pressure ratings. The -HA, -SP, -MP and -HP options cover these requirements. The -SP provides local visual indication only and does not provide relay contacts.
To select the correct model, confirm the operating differential range and maximum total pressure on either side of the diaphragm. The gas, ambient temperature, mounting arrangement and any calibration certificate requirement should also be established before specification.
Key Features
- Frictionless magnetic movement: Jewelled bearings and magnetic coupling provide quick response while helping resist shock and vibration
- Accessible zero adjustment: Allows the gauge to be zeroed without removing the cover
- Broad scale choice: Multiple engineering units, zero positions, dual scales and air velocity formats help match the application
- High Accuracy option: The -HA option improves accuracy to ±1% of full scale on applicable ranges and includes a mirrored scale overlay and six-point calibration certificate
- Local setpoint indication: The -SP option provides a bright red LED indication at an adjustable setpoint from a 12 to 24 VDC supply, without relay contacts
- Higher total pressure options: -MP and -HP construction increases the total pressure rating to 35 and 80 psig respectively
- Flexible pressure connections: Duplicate high and low pressure ports at the side and rear support different tubing routes
- Mounting choice: Surface and flush mounting can be supplemented with pipe, portable and air filter monitoring accessories
Specifications
| Measurement and Performance | |
| Service | Air and compatible non-combustible gases. A natural gas option is available. Hydrogen service requires a Buna-N diaphragm and pressures below 35 psi. Consult DwyerOmega for wetted materials and media compatibility. |
| Pressure indication | Positive, negative (vacuum) or differential pressure. |
| Scale selection | Model-dependent ranges are available in multiple units, including in w.c., Pa, kPa, mm water, cm water and psi, with off-zero, zero-centre, dual-unit, air velocity and flow scales available on selected models. |
| Standard accuracy | ±2% of full scale at 21.1°C. Accuracy is ±3% on -0, -100PA, -125PA and -10MM ranges, and ±4% on -00, -60PA and -6MM ranges. |
| -HA accuracy | ±1% of full scale at 21.1°C on applicable ranges. Accuracy is ±1.5% on -0, -100PA, -125PA and -10MM ranges, and ±2% on -00, -60PA and -6MM ranges. |
| Total pressure limits | Standard: -20 in Hg to 15 psig (-0.677 to 1.034 bar). -MP: 35 psig (2.41 bar). -HP: 80 psig (5.52 bar). |
| Construction and Environment | |
| Enclosure rating | IP67. |
| Ambient temperature | -6.67 to 60°C as standard. The -LT option extends the lower limit to -28°C. |
| Dial | 101.6 mm (4 in) diameter dial face. |
| Mounting orientation | Diaphragm in the vertical position. Consult DwyerOmega for other orientations. |
| Process connections | Duplicate high and low 1/8 in female NPT pressure taps, with one pair at the side and one pair at the rear. |
| Standard housing | Die-cast aluminium case and bezel with an acrylic cover. |
| Weight | 510 g as standard; 963 g with -MP or -HP construction. |
| Power requirement | Mechanical pointer indication requires no external supply. The -SP LED setpoint indicator requires 12 to 24 VDC. |
| Options and Compatibility | |
| -HA High Accuracy | Includes a mirrored scale overlay and six-point calibration certificate. |
| -SP LED Setpoint Indicator | Bright red, field-adjustable LED indicates when the setpoint is reached. It provides visual indication only and no relay contacts. Supplied with the medium pressure bezel and requires a 4-13/16 in flush-mounting hole. |
| -ASF Adjustable Signal Flag | Adjustable visual flag integral with the gauge cover. Not available with -MP or -HP construction. |
| Scale overlays | -G, -R and -Y provide transparent green, red or yellow overlays for visual emphasis. The -M mirrored overlay helps reduce parallax error. |
| -AHU1 and -AHU2 Mounting Plates | -AHU1 includes an attached surface-mounting plate. -AHU2 also includes the A-481 installer kit. |
| -FC and -NIST Documentation | Factory calibration certificate or NIST-traceable calibration certificate options. |
| Bezel options | -CB chrome-plated aluminium, -SB electropolished 304 stainless steel and -SS brushed 304 stainless steel. |
| Option compatibility | Available ranges and option combinations vary by model. Confirm the selected configuration against the current DwyerOmega datasheet. |
| Compliance | |
| RoHS | The manufacturer states that the Series 2000 meets the technical requirements of EU Directive 2011/65/EU (RoHS II). -SP models are not RoHS approved. |
Scope of Delivery
- Series 2000 gauge in the selected configuration
- Two 1/8 in NPT plugs for the duplicate pressure taps
- Two 1/8 in pipe-thread-to-rubber-tubing adaptors
- Mounting hardware comprising three flush-mounting adaptors with screws for standard construction, or a mounting ring and snap-ring retainer for -MP and -HP construction
Support
Able Instruments are an official UK and Ireland channel partner for DwyerOmega, providing application advice, configuration support and quotation assistance for the Series 2000 family.
- Model selection: Support matching an existing gauge or defining the correct pressure range and scale
- Option compatibility: Checks for -HA, -SP, -MP, -HP and other selected options
- Installation support: Advice on mounting, tubing, static pressure tips and enclosures
- Documentation support: Help confirming factory or NIST-traceable calibration certificate requirements
Accessories
- A-605 Air Filter Gauge Accessory Kit
- A-432 Portable Kit
- A-610 Pipe Mounting Kit
- A-300 Flush Mounting Bracket
- A-368 Surface Mounting Plate
- A-371 Surface Mounting Bracket for -MP/-HP Models