004_Layout 2 7/12/13 11:17 AM Page 4

Series ®
Magnehelic Differential Pressure Gages
PRESSURE

2000

Indicate Positive, Negative or Differential, Accurate within 2% RoHS

.025 (.64) SPACE CREATED BY 3 (3) 6-32 X 3/16 (4.76) DEEP HOLES
SPACER PADS WHEN SURFACE RUBBER PRESSURE RELIEF EQUALLY SPACED ON A Ø4-1/8
MOUNTED. DO NOT OBSTRUCT. PLUG WILL UNSEAT ITSELF (104.78) BOLT CIRCLE FOR
PROVIDES PATH FOR RELIEF OF WHEN GAGE IS PANEL MOUNTING
OVERPRESSURE. 17/32 OVERPRESSURIZED 1/8 FEMALE NPT
(13.49) HIGH PRESSURE
1/8 FEMALE CONNECTION
NPT HIGH
PRESSURE
CONNECTION
1-1/4 1-3/4
(31.75) (44.45)
1/8 FEMALE
NPT LOW
Ø4-1/2 PRESSURE
Differential Pressure Gages

(114.3) CONNECTION
1/2
(12.70)

15/32 1/8 FEMALE NPT

Ø4-3/4 (11.91) 11/16 LOW PRESSURE
(120.65) 7/16 (17.46) CONNECTION
1-11/16 (11.11)
(42.86)
17/32 ø4-3/4 (120.65) PANEL CUTOUT
(13.49) 1/8 FEMALE NPT
HIGH PRESSURE
CONNECTION

ø5
1-1/4 (127) 1-3/4
(31.75) (44.45)

ø4-47/64
ø4-1/2 (120.27)
(114.3)
1/2
(12.70)

ø5-1/2 15/32 1/8 FEMALE

(11.91) 11/16 NPT LOW
(139.70) 3/16 (17.46) PRESSURE
MOUNTING RING 2-17/32
(64.29) (4.76) CONNECTION

Select the Dwyer® Magnehelic® gage for high accuracy — guaranteed within 2% of SPECIFICATIONS
full-scale — and for the wide choice of 81 models available to suit your needs precisely. Using Service: Air and non-combustible, compatible gases (natural gas option available).
Dwyer's simple, frictionless Magnehelic® gage movement, it quickly indicates low air or non- Note: May be used with hydrogen. Order a Buna-N diaphragm. Pressures must be
corrosive gas pressures — either positive, negative (vacuum) or differential. The design less than 35 psi.
resists shock, vibration and over-pressures. No manometer fluid to evaporate, freeze or Wetted Materials: Consult factory.
cause toxic or leveling problems. It's inexpensive, too. Housing: Die cast aluminum case and bezel, with acrylic cover. Exterior finish is
The Magnehelic® gage is the industry standard to measure fan and blower pressures, coated gray to withstand 168 hour salt spray corrosion test.
filter resistance, air velocity, furnace draft, pressure drop across orifice plates, liquid Accuracy: ±2% of FS (±3% on - 0, -100 Pa, -125 Pa, 10MM and ±4% on - 00, -60
levels with bubbler systems and pressures in fluid amplifier or fluidic systems. It also Pa, -6MM ranges), throughout range at 70°F (21.1°C).
checks gas-air ratio controls and automatic valves, and monitors blood and respiratory Pressure Limits: -20 in Hg to 15 psig† (-0.677 to 1.034 bar); MP option: 35 psig
pressures in medical care equipment. (2.41 bar); HP option: 80 psig (5.52 bar).
Overpressure: Relief plug opens at approximately 25 psig (1.72 bar), standard
Mounting gages only. See Overpressure Protection Note on next page.
A single case size is used for most models of Magnehelic® gages. They can be flush Temperature Limits: 20 to 140°F* (-6.67 to 60°C). -20°F (-28°C) with low
or surface mounted with standard hardware supplied. Although calibrated for vertical temperature option.
position, many ranges above 1˝ may be used at any angle by simply re-zeroing. Size: 4˝ (101.6 mm) diameter dial face.
However, for maximum accuracy, they must be calibrated in the same position in Mounting Orientation: Diaphragm in vertical position. Consult factory for other
which they are used. These characteristics make Magnehelic® gages ideal for both position orientations.
stationary and portable applications. A 4-9/16˝ hole is required for flush panel Process Connections: 1/8˝ female NPT duplicate high and low pressure taps -
mounting. Complete mounting and connection fittings, plus instructions, are one pair side and one pair back.
furnished with each instrument. See page 7 for more information on mounting Weight: 1 lb 2 oz (510 g), MP & HP 2 lb 2 oz (963 g).
accessories. Standard Accessories: Two 1/8˝ NPT plugs for duplicate pressure taps, two 1/8˝
pipe thread to rubber tubing adapter, and three flush mounting adapters with
screws. (Mounting and snap ring retainer substituted for three adapters in MP &
HP gage accessories.)
Agency Approval: RoHS. Note: -SP models not RoHS approved.
†For applications with high cycle rate within gage total pressure rating, next higher rating
is recommended. See Medium and High pressure options at lower left.

ACCESSORIES

Model A-432 Portable Kit

Combine carrying case with any Magnehelic® gage of
Flush, Surface or Pipe Mounted standard range, except high pressure connection.
Includes 9 ft (2.7 m) of 3/16˝ ID rubber tubing,
standhang bracket and terminal tube with holder.

Model A-605 Air Filter Gage Accessory Kit

Adapts any standard Magnehelic® gage for use as an
air filter gage. Includes aluminum surface mounting
bracket with screws, two 5 ft (1.5 m) lengths of 1/4˝
aluminum tubing two static pressure tips and two
molded plastic vent valves, integral compression
fittings on both tips and valves.
Enclosure Mounted
A-605B Air Filter Gage Accessory Kit, Air filter kit with two plastic open/close
valves, two 4˝ steel static tips, plastic tubing and mounting flange

A-605C Air Filter Gage Accessory Kit, Air filter kit with two plastic open/close
valves, two plastic static tips, plastic tubing and mounting flange

4 DWYER INSTRUMENTS, INC. | www.dwyer-inst.com

005_Layout 2 7/12/13 11:19 AM Page 5

PRESSURE
Series ®
2000
Magnehelic Gage Models & Ranges
Bezel provides flange for flush mounting in panel. O-ring seal for cover assures pressure integrity of case.

Clear plastic face is highly resistant to breakage. Provides OVERPRESSURE PROTECTION

undistorted viewing of pointer and scale. Blowout plug is comprised of a rubber plug on the rear which
functions as a relief valve by unseating and venting the gage
Precision litho-printed scale is accurate and easy to read. interior when over pressure reaches approximately 25 psig (1.7
bar). To provide a free path for pressure relief, there are four
Red tipped pointer of heat treated aluminum tubing is easy spacer pads which maintain 0.023˝ clearance when gage is

Differential Pressure Gages

to see. It is rigidly mounted on the helix shaft. surface mounted. Do not obstruct the gap created by these pads.
The blowout plug is not used on models above 180˝ of water
Pointer stops of molded rubber prevent pointer over-travel pressure, medium or high pressure models, or on gages which
without damage. require an elastomer other than silicone for the diaphragm.
The blowout plug should not be used as a system overpressure
“Wishbone” assembly provides mounting for helix, helix control. High supply pressures may still cause the gage to fail due
bearings and pointer shaft. to over pressurization, resulting in property damage or serious
injury. Good engineering practices should be utilized to prevent
Jeweled bearings are shock-resistant mounted; provide your system from exceeding the ratings or any component.
virtually friction-free motion for helix. Motion damped with
high viscosity silicone fluid. Die cast aluminum case is precision made and iridite-dipped to
withstand 168 hour salt spray corrosion test. Exterior finished in
Zero adjustment screw is conveniently located in the baked dark gray hammerloid. One case size is used for all
plastic cover, and is accessible without removing cover. standard pressure options, and for both surface and flush
O-ring seal provides pressure tightness. mounting.

Helix is precision made from an alloy of high magnetic Silicone rubber diaphragm with integrally molded O-ring is
permeability. Mounted in jeweled bearings, it turns freely, supported by front and rear plates. It is locked and sealed in
following the magnetic field to move the pointer across position with a sealing plate and retaining ring. Diaphragm motion
the scale. is restricted to prevent damage due to overpressures.

Calibrated range spring is flat spring steel. Small amplitude Samarium Cobalt magnet mounted at one end of range spring
of motion assures consistency and long life. It reacts to rotates helix without mechanical linkages.
pressure on diaphragm. Live length adjustable for calibration.

Dual Scale Air Velocity Units

Range Inches Range Range MM Range, For use with pitot tube
Model of Water Model PSI Model of Water Model kPa
2000-00N†•• .05-0-.2 2201 0-1 2000-6MM†•• 0-6 2000-0.5KPA 0-0.5
2000-00†•• 0-.25 2202 0-2 2000-10MM†• 0-10 2000-1KPA 0-1
Range in W.C./
2000-0†• 0-.50 2203 0-3 2000-15MM 0-15 2000-1.5KPA 0-1.5
Model Velocity F.P.M.
2001 0-1.0 2204 0-4 2000-25MM 0-25 2000-2KPA 0-2
2000-00AV†•• 0-.25/300-2000
2002 0-2.0 2205 0-5 2000-30MM 0-30 2000-2.5KPA 0-2.5
2003 0-3.0 2210* 0-10 2000-50MM 0-50 2000-3KPA 0-3
2000-0AV†• 0-.50/500-2800
2004 0-4.0 2215* 0-15 2000-80MM 0-80 2000-4KPA 0-4
2005 0-5.0 2220* 0-20 2000-100MM 0-100 2000-5KPA 0-5
2001AV 0-1.0/500-4000
2006 0-6.0 2230** 0-30 2000-125MM 0-125 2000-8KPA 0-8
2008 0-8.0 2000-150MM 0-150 2000-10KPA 0-10
2002AV 0-2.0/1000-5600
2010 0-10 Range, 2000-200MM 0-200 2000-15KPA 0-15
2012 0-12 CM of 2000-250MM 0-250 2000-20KPA 0-20
2005AV 0-5.0/2000-8800
2015 0-15 Model Water 2000-300MM 0-300 2000-25KPA 0-25
2020 0-20 2000-15CM 0-15 Zero Center Ranges 2000-30KPA 0-30
Zero Center Ranges 2010AV 0-10/2000-12500
2025 0-25 2000-20CM 0-20 2300-6MM†•• 3-0-3
2030 0-30 2000-25CM 0-25 2300-10MM†• 5-0-5 2300-1KPA .5-0-.5
2040 0-40 2000-50CM 0-50 2300-20MM†• 10-0-10 2300-2KPA 1-0-1
2050 0-50 2000-80CM 0-80 Model Range, Pa 2300-2.5KPA 1.25-0-1.25
2060 0-60 2000-100CM 0-100 2000-60NPA†•• 10-0-50 2300-3KPA 1.5-0-1.5
2080 0-80 2000-150CM 0-150 2000-60PA†•• 0-60 Dual Scale English/Metric Models
2100 0-100 2000-200CM 0-200 2000-100PA†• 0-100 Range, Range,
2120 0-120 2000-250CM 0-250 2000-125PA†• 0-125 Model in w.c. Pa or kPa
2150 0-150 2000-300CM 0-300 2000-250PA 0-250 2000-00D†•• 0-.25 0-62 Pa
2160 0-160 Zero Center Ranges 2000-300PA 0-300 2000-0D†• 0-0.5 0-125 Pa
2180* 0-180 2000-500PA 0-500 2001D 0-1.0 0-250 Pa
2300-4CM 2-0-2
2250* 0-250 2000-750PA 0-750 2002D 0-2.0 0-500 Pa
2300-10CM 5-0-5
Zero Center Ranges 15-0-15 2000-1000PA 0-1000 2003D 0-3.0 0-750 Pa
2300-30CM
2300-00†•• 0.125-0-0.125 Zero Center Ranges 2004D 0-4.0 0-1.0 kPa
2300-0†• .25-0-.25 Model Range, Pa 2005D 0-5.0 0-1.25 kPa
2301 .5-0-.5 †These ranges calibrated 2300-60PA†•• 30-0-30 2006D 0-6.0 0-1.5 kPa
2302 1-0-1 for vertical scale position. 2300-100PA†• 50-0-50 2008D 0-8.0 0-2.0 kPa
2304 2-0-2 • Accuracy +/-3% 2300-120PA 60-0-60 2010D 0-10 0-2.5 kPa
2310 5-0-5 • • Accuracy +/-4% 2300-200PA 100-0-100 2015D 0-15 0-3.7 kPa
2320 10-0-10 *MP option standard 2300-250PA 125-0-125 2020D 0-20 0-5 kPa
2330 15-0-15 **HP option standard 2300-300PA 150-0-150 2025D 0-25 0-6.2 kPa
2300-500PA 250-0-250 2050D 0-50 0-12.4 kPa
2300-1000PA 500-0-500 2060D 0-60 0-15 kPa
VELOCITY AND VOLUMETRIC FLOW UNITS
Scales are available on the Magnehelic® 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.

ACCESSORIES A-310A 3-Way Vent Valves

A-321, Safety Relief Valve In applications where pressure is continuous and the
A-448, 3-piece magnet kit for mounting Magnehelic® gage directly to Magnehelic® gage is connected by metal or plastic
magnetic surface tubing which cannot be easily removed, we suggest
A-135, Rubber gasket for panel mounting using Dwyer A-310A vent valves to connect gage.
A-401, Plastic Carry Case Pressure can then be removed to check or re-zero the
gage.

CONTACT US | U.S. 219/879-8000 | U.K. (+44) (0)1494-461707 | A.U. (+61) (0) 2 4272 2055 | China +852-23181007 5