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2-1/2 [63.50]
HOUSING REMOVAL
PRESSURE CONNECTION
SERIES A3000
E
PHOTOHELIC® PRESSURE SWITCH/GAGE
3-in-1 Indicating Gage, Lo-Limit and Hi-Limit Control
CALIBRATION SERVICES AVAILABLE
PRESSURE
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The Series A3000 Photohelic® Pressure Switch/Gage functions as versatile, highly
repeatable pressure switches combined with a precise pressure gage employing
the time-proven Magnehelic
and controls positive, negative or differential pressures of air and compatible gases.
Standard models are rated to 25 psig (1.7 bar) with options to 35 (2.4) or 80 (5.5
bar) psig. Two phototransistor actuated, DPDT relays are included for low/high limit
control. Easy to adjust set point indicators are controlled by knobs located on the gage
face. Individual set point deadband is one pointer width - less than 1% of full-scale.
Set points can be interlocked to provide variable deadband - ideal for control of fans,
dampers, etc. Gage reading is continuous and unaffected by switch operation, even
during loss of electrical power. Choose from full-scale pressure ranges from a low
0-.25 in (0-6 mm) w.c. up to 30 psi (21 bar).
BENEFITS/FEATURES
• 3-in-1 instrument allows the reduction of several instruments with one product,
saving inventory, installation time and money
• Patented design and 1% full-scale dead band provides quick response to pressure
changes means no delay in switching and chatter-free operation
• Awiderangeofmodelsthatcanmeetpressuremeasurementspecicationsfrom
low to very high
Differential Pressure
Gages/Switches, Dial
APPLICATIONS
• Air conditioning systems
• Clean rooms
• Fume exhaust systems
Set points are instantly
adjusted with front knobs
®
gage design. The Photohelic® switch/gage measures
1/8 FEMALE NPT HIGH
PRESSURE CONNECTION
1/8 FEMALE NPT LOW
Ø4-3/4
[120.65]
3-7/8 SQ
3/4 CONDUIT
CONNECTION
4-3/8 [111.13]
SPECIFICATIONS
GAGE SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Accuracy: ±2% of FS at 70°F (21.1°C). ±3% on -0 and ±4% on -00 models.
Pressure Limits:-20˝Hgto25psig(-0.677to1.72bar);MPoption:35psig(2.41
bar);HPoption:80psig(5.52bar).
Temperature Limits: 20 to 120°F (-6.67 to 48.9°C). Low temperature option
available.
Process Connections: 1/8˝femaleNPT.
Size:4˝(101.6mm)dialface,5˝(127mm)ODx8-1/4˝(209.55mm).
Weight: 4 lb (1.81 kg).
SWITCH SPECIFICATIONS
Switch Type: Each set point has 2 form C relays (DPDT).
Repeatability: ±1% of FS.
Electrical Rating: 10 A @ 28 VDC, 10 A @ 120, 240 VAC.
Electrical Connections: Screw terminals. Use 167°F (75°C) copper conductors
only.
Power Requirements:120VAC,50/60Hz;240VACand24VACpoweroptional.
Mounting Orientation: Diaphragm in vertical position. Consult factory for other
position orientations.
Set Point Adjustment: Adjustable knobs on face.
Compliance: CE, CSA, UL.
[98.43]
2-1/16 [52.39]
2 [50.80]
3-7/8 [98.43]
5-1/8 [130.18]
6-3/8 [161.93]
7-5/8 [193.68]
1-1/4
[31.75]
Ø4-47/64
[120.25]
5/8 [15.88]
5/8 [15.88]
PANEL MAX
3/16 [4.76]
(4) 6-32 HOLES
EQUALLY SPACED ON
A 5-1/8 [130.18] B.C.
Ø5
[127.00]
Ø4 [101.60]
5-1/2 [139.70]
MOUNTING
FACE
O.D.
RING
DWYER INSTRUMENTS, LLC | dwyer-inst.com38
Page 2
SERIES A3000
PHOTOHELIC® PRESSURE SWITCH/GAGE
3-in-1 Indicating Gage, Lo-Limit and Hi-Limit Control
CALIBRATION SERVICES AVAILABLE
PRESSURE
Bezel and front cover (with set point knobs and zero
a dju st m ent sc r e w) re m ove d to exp os e P hot oh e lic
set point mechanism. Cover is c lear polyc arbonate
plastic.
Gage pointer and light shutter are mounted on helix
and balancing counterweight. Shutter passes through
slot in optical limit switch to expose phototransistors to
integral infrared light source or mask them depending
on applied pressure.
Light shield effectively protects phototransistors from
strong outside light sources yet allows free pointer
movement. It also gives interior a clean “ nished” look.
Optical limit switches are used for reliability and
long service life. Attached directly to set pointers, they
are individually aligned to assure precise switching
accuracy.
Semi- Flexible drive shaft connects to set point
knobs.
MODEL CHART
Model Range, in w.c.
A3000-00
A3000-0
A3001
A3002
A3003
A3004
A3005
A3006
A3008
A3010
A3015
A3020
A3025
A3030
A3040
A3050
A3060
A3080
A3100
A3150
Bi-Directional Range
A3000-00N .05-.20
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
0-15
0-20
0-25
0-30
0-40
0-50
0-60
0-80
0-100
0-150
Zero Center Ranges
Model Range, in w.c. Model Range, Pa
A3300-0
A3301
A3302
A3304
A3310
A3320
A3330
Model
A3000-00AV
A3000-0AV
A3001AV
A3002AV
A3010AV
Pitot tube required
®
gage
.25-0-.25
.5-0-.5
1-0-1
2-0-2
5-0-5
10-0-10
15-0-15
Range, in w.c.
/Air Velocity, F.P.M. Model Range, Pascals
0-.25/300-2000
0-.50/500-2800
0-1.0/500-4000
0-2.0/1000-5600
0-10/2000-12500
Model Range, mm w.c.
A3000-6MM
A3000-10MM
A3000-25MM
A3000-50MM
A3000-80MM
A3000-100MM
Zero Center
A3300-20MM
A3300-30MM
A3000-60PA
A3000-125PA
A3000-250PA
A3000-500PA
A3000-750PA
0-6
0-10
0-25
0-50
0-80
0-100
10-0-10
15-0-15
0-60
0-125
0-250
0-500
0-750
Plastic enclosure protects electronic components
and electrical connections.
Polycarbonate connection or terminal board is selfextinguishing.
Glass-epoxy printed circuit boards for durability
and performance.
Load relays are DPDT with latching feature for
maximum application versatility.
Electronics are designed to operate on 50/60 Hz, 120
volt current with 10% over or under voltage. Special
units for other voltages are available.
Switch set pointers show switch set tings at all times.
Spring loaded friction clutch prevents operator
damage of set point mechanism.
Zero adjustment screw connects to screw in cover to
adjust zero pressure reading.
Zero Center Ranges
A3300-250PA
A3300-500PA
Model Range, kPa
A3000-1KPA
A3000-1.5KPA
A3000-2KPA
A3000-3KPA
A3000-4KPA
A3000-5KPA
A3000-8KPA
A3000-10KPA
A3000-15KPA
A3000-20KPA
A3000-25KPA
A3000-30KPA
Zero Center Ranges
Model Range, kPa
A3300-1KPA
A3300-3KPA
125-0-125
250-0-250
0-1
0-1.5
0-2
0-3
0-4
0-5
0-8
0-10
0-15
0-20
0-25
0-30
.5-0- .5
1.5-0-1.5
Gages/Switches, Dial
Differential Pressure
OPTIONS
To order add sufx: Description
-HP
-LT
-MP
-NIST
-OLS
-RMR
-SRH
-SRL
-TAMP
Note: Special models can be built to OEM customers’ specications with scales
reading in special pressure units like ounces per square inch, inches of mercury, etc.
Square Root Scales reading in FPM or SCFM are also available. Custom logos and
special graduations can also be included. Contact factory for minimum quantities and
pricing.
High pressure
Low temperature (-20°F)
Medium pressure
NIST traceable calibration certicate
OEM model
Remote mounted relay
Single relay activates on increase
Single relay activates on decrease
Tamper proof knobs
ACCESSORIES
Model Description
A-298
Flat ush mounting bracket
A-601
Manual reset switch net
Process Tubing Options: See page 453 (Gage Tubing Accessories)
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39
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