MAGNEHELIC® DIFFERENTIAL PRESSURE GAGES

Indicate Positive, Negative or Differential,Accurate within 1%

21

Bezel provides flange for flush mounting in panel.

Clear plastic face is highly resistant to breakage. Provides

undistorted viewing of pointer and scale.

Precision litho-printed scale is accurate and easy to read.

Calibrated range spring is flat spring steel. Small amplitude of

motion assures consistency and long life. It reacts to pressure

on diaphragm. Live length adjustable for calibration.

Red tipped pointer of heat treated aluminum tubing is easy to

see. It is rigidly mounted on the helix shaft.

Pointer stops of molded rubber prevent pointer over-travel

without damage.

“Wishbone” assembly provides mounting for helix, helix

bearings and pointer shaft.

Jeweled bearings are shock-resistant mounted; provide

virtually friction-free motion for helix. Motion damped with high

viscosity silicone fluid.

Helix is precision made from an alloy of high magnetic

permeability. Mounted in jeweled bearings, it turns freely,

following the magnetic field to move the pointer across the

scale.

Zero adjustment screw is conveniently located in the plastic

cover, and is accessible without removing cover. O-ring seal

provides pressure tightness.

O-ring seal for cover assures pressure integrity of case.

OVERPRESSURE PROTECTION

Blowout plug is comprised of a rubber plug on the rear which

functions as a relief valve by unseating and venting the gage

interior when over pressure reaches approximately 25 psig

(1.7 bar). To provide a free path for pressure relief, there are

four spacer pads which maintain 0.023˝ clearance when gage

is surface mounted. Do not obstruct the gap created by these

pads.

The blowout plug is not used on models above 180˝ of water

pressure, medium or high pressure models, or on gages which

require an elastomer other than silicone for the diaphragm.

The blowout plug should not be used as a system overpressure

control. High supply pressures may still cause the gage to fail

due to over pressurization, resulting in property damage or

serious injury. Good engineering practices should be utilized

to prevent your system from exceeding the ratings of any

component.

Die cast aluminum case is precision made and iridite-dipped

to withstand 168 hour salt spray corrosion test. Exterior

finished in baked dark gray hammerloid. One case size is used

for all standard pressure options, and for both surface and flush

mounting.

Silicone rubber diaphragm with integrally molded O-ring

is supported by front and rear plates. It is locked and sealed

in position with a sealing plate and retaining ring. Diaphragm

motion is restricted to prevent damage due to overpressures.

Samarium Cobalt magnet mounted at one end of range

spring rotates helix without mechanical linkages.

VELOCITY AND

VOLUMETRIC FLOW UNITS

Scales are available on the

Magnehelic® gage that read

in velocity units (FPM, m/s) or

volumetric flow units (SCFM,

m3/s, m3/h).

Stocked velocity units with dual

range scales in inches w.c.

and feet per minute are shown

above. For other ranges contact

the factory.

When

ordering

volumetric

flow scales please specify

the maximum flow rate and its

corresponding pressure.

Example: 0.5 in w.c. = 16,000

CFM.

A-310A

SERIES 2000

DWYER INSTRUMENTS, LLC | dwyer-inst.com

CALIBRATION SERVICES AVAILABLE

ACCESSORIES

Model Description

A-135

A-310A

A-321

A-401

A-448

Rubber gasket for panel mounting

3-way vent valves. In applications where pressure is continuous and the Magnehelic® gage is

connected by metal or plastic tubing which cannot be easily removed, we suggest using Dwyer

A-310A vent valves to connect gage. Pressure can then be removed to check or re-zero the gage

Safety relief valve

Plastic carry case

3-piece magnet kit for mounting Magnehelic® gage directly to magnetic surface

MODEL CHART

Model

Range,

Inches of

Water

Model

Range,

PSI

Model

Range,

MM of

Water

Model

Range,

kPa

Dual Scale Air Velocity Units

For use with pitot tube

2000-00N†••

2000-00†••

2000-0†•

2001

2002

2003

2004

2005

2006

2008

2010

2012

2015

2020

2025

2030

2040

2050

2060

2080

2100

2120

2150

2160

2180*

2250*

.05-0-.2

0-.25

0-.50

0-1.0

0-2.0

0-3.0

0-4.0

0-5.0

0-6.0

0-8.0

0-10

0-12

0-15

0-20

0-25

0-30

0-40

0-50

0-60

0-80

0-100

0-120

0-150

0-160

0-180

0-250

2201

2202

2203

2204

2205

2210*

2215*

2220*

2230**

0-1

0-2

0-3

0-4

0-5

0-10

0-15

0-20

0-30

2000-6MM†••

2000-10MM†•

2000-15MM

2000-25MM

2000-30MM

2000-50MM

2000-80MM

2000-100MM

2000-125MM

2000-150MM

2000-200MM

2000-250MM

2000-300MM

0-6

0-10

0-15

0-25

0-30

0-50

0-80

0-100

0-125

0-150

0-200

0-250

0-300

2000-0.5KPA

2000-1KPA

2000-1.5KPA

2000-2KPA

2000-2.5KPA

2000-3KPA

2000-4KPA

2000-5KPA

2000-8KPA

2000-10KPA

2000-15KPA

2000-20KPA

2000-25KPA

2000-30KPA

0-0.5

0-1

0-1.5

0-2

0-2.5

0-3

0-4

0-5

0-8

0-10

0-15

0-20

0-25

0-30

Model

Range, in w.c./

Velocity F.P.M.

2000-00AV†••

2000-0AV†•

2001AV

2002AV

2005AV

2010AV

0-.25/300-2000

0-.50/500-2800

0-1.0/500-4000

0-2.0/1000-5600

0-5.0/2000-8800

0-10/2000-12500

Model

Range,

CM of

Water

2000-15CM

2000-20CM

2000-25CM

2000-50CM

2000-80CM

2000-100CM

2000-150CM

2000-200CM

2000-250CM

2000-300CM

0-15

0-20

0-25

0-50

0-80

0-100

0-150

0-200

0-250

0-300

Zero Center Ranges

Zero Center Ranges

2300-6MM†••

2300-10MM†•

2300-20MM†•

3-0-3

5-0-5

10-0-10

2300-1KPA

2300-2KPA

2300-2.5KPA

2300-3KPA

.5-0-.5

1-0-1

1.25-0-1.25

1.5-0-1.5

Model

Range, Pa

Zero Center Ranges

2000-60NPA†••

2000-30PA†••

2000-60PA†••

2000-100PA†•

2000-125PA†•

2000-250PA

2000-300PA

2000-500PA

2000-750PA

2000-1000PA

10-0-50

0-30

0-60

0-100

0-125

0-250

0-300

0-500

0-750

0-1000

Dual Scale English/Metric Models

2300-4CM

2300-10CM

2300-30CM

2-0-2

5-0-5

15-0-15

Model

Range,

in w.c.

Range,

Pa or kPa

Zero Center Ranges

2000-00D†••

2000-0D†•

2001D

2002D

2003D

2004D

2005D

2006D

2008D

2010D

2015D

2020D

2025D

2050D

2060D

0-.25

0-0.5

0-1.0

0-2.0

0-3.0

0-4.0

0-5.0

0-6.0

0-8.0

0-10

0-15

0-20

0-25

0-50

0-60

0-62 Pa

0-125 Pa

0-250 Pa

0-500 Pa

0-750 Pa

0-1.0 kPa

0-1.25 kPa

0-1.5 kPa

0-2.0 kPa

0-2.5 kPa

0-3.7 kPa

0-5 kPa

0-6.2 kPa

0-12.4 kPa

0-15 kPa

2300-00†••

2300-0†•

2301

2302

2304

2310

2320

2330

0.125-0-0.125

.25-0-.25

.5-0-.5

1-0-1

2-0-2

5-0-5

10-0-10

15-0-15

Zero Center Ranges

Model

Range, Pa

2300-60PA†••

2300-100PA†•

2300-120PA

2300-200PA

2300-250PA

2300-300PA

2300-500PA

2300-1000PA

30-0-30

50-0-50

60-0-60

100-0-100

125-0-125

150-0-150

250-0-250

500-0-500

†These ranges calibrated for vertical scale position. • Accuracy ±3%. •• Accuracy ±4%. *MP option standard. **HP option standard.

USA: California Proposition 65

WARNING: This product can expose you to chemicals

including Lead, which is known to the State of California to

cause cancer and birth defects or other reproductive harm.

For more information go to www.P65Warnings.ca.gov.

YEAR LIMITED

WARRANTY