Dwyer Instruments Series A3000 Photohelic Installation and Operating Instructions
Series A3000 Photohelic® Differential Pressure Switch/Gage
2-1/2 [63.50]
(4) 6-32 HOLES
HOUSING REMOVAL
PRESSURE CONNECTION
FOR SERIES 36000S MODELS.
SNAP RING GROOVE
®
Specications - Installation and Operating Instructions
Bulletin B-33-A
The SERIES A3000 PHOTOHELIC® Switch/Gage is a versatile 2-in-1 instrument
combining a time-proven Magnehelic
switches. It is designed to measure and control positive, negative or differential pressure
of air or other non-combustible, non-corrosive gases. Gage reading is unaffected by
switch operation. Switch set points are easily adjusted with knobs located on gage
face. Applied pressure and switch set points are fully visible at all times. Deadband is
one pointer width, less than 1% of full scale. Each set point controls a DPDT relay and
both relays can be interlocked to provide variable deadband control.
INSTALLATION
1. Location: Select a clean, dry, vibration-free location where ambient temperatures
will be between 20 and 120°F (-6.67 and 48.9°C). Tubing supplying pressure to the
instrument can be practically any length but long runs will increase response time
slightly.
2. Position: The PHOTOHELIC
in a vertical plane. Operation at other angles may affect accuracy and/or require zero
adjustment. Most models can be specially calibrated at the factory for other positions
if specied at time of ordering. Ranges below 1 in w.c. must be used only with scale
vertical.
3. Mounting: The PHOTOHELIC
electrical connections. The electrical enclosure is removable at any time regardless of
mounting method.
(A) Panel Mounting: Normal mounting is ush or through panel as shown in Figure B.
Allow 4-3/8˝ (111.13 mm) clearance behind the unit for removal of electrical enclosure.
Make a 4-13/16˝ (122.24 mm) diameter hole in panel. Insert the PHOTOHELIC
Switch/Gage unit from front of panel and slip mounting ring over case from behind
with stepped side facing rear. Fit the snap ring into narrow groove at back edge of the
bezel. Thread four 6-32 x 1-1/4˝ mounting screws into tapped holes in mounting ring
and seat it against snap ring. Tighten screws against back of panel. See Figure B.
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differential pressure gage with low/high pressure
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Switch/Gage is factory calibrated for use with scale
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Switch/Gage is normally mounted before making
3-7/8 SQ
[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]
Figure A
5/8 [15.88]
PANEL MAX
1/8 FEMALE NPT HIGH
PRESSURE CONNECTION
1/8 FEMALE NPT LOW
Ø4-3/4
[120.65]
3/4 CONDUIT
CONNECTION
4-3/8 [111.13]
Note: Detailed dimension drawings are available from our Customer Service Dept. for
PHOTOHELIC
housing, request no. 13-700132-00. /For explosion-proof housing, request no. 13700113-01.
SPECIFICATIONS
GAGE SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Accuracy: ±2% of full scale at 70°F (21.1°C). ±3% on -0 and ±4% on -00 models.
Pressure Limits: -20˝ Hg. to 25 psig (-0.677 to 1.72 bar). MP option; 35 psig
(2.41 bar), HP option; 80 psig (5.52 bar). 36003S – 36010S; 150 psig (10.34 bar).
36020S and higher;1.2 x full scale pressure.
Temperature Limits: 20 to 120°F (-6.67 to 48.9°C) Low temperature option
available.
Process Connections: 1/8˝ female NPT.
Size: 4˝ (101.6 mm) dial face, 5˝ (127 mm) O.D. x 8-1/4˝ (209.55 mm).
Weight: 4 lb (1.81 kg).
SWITCH SPECIFICATIONS
Switch Type: Each setpoint has 2 Form C relays (DPDT).
Repeatability: ±1% of full scale.
Electrical Rating: 10A @ 28 VDC, 10A @ 120, 240 VAC.
Electrical Connections: Screw terminals. Use 167°F (75°C) copper conductors
only.
Power Requirements: 120 VAC, 50/60 Hz; 240 VAC & 24 VAC Power optional.
Mounting Orientation: Diaphragm in vertical position. Consult factory for other
position orientations.
Set Point Adjustment: Adjustable knobs on face.
Agency Approvals: CE, CSA, UL.
®
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switch/gages as installed in two optional enclosures. For weatherproof
1-1/4
[31.75]
Ø4-47/64
[120.25]
[127.00]
5/8 [15.88]
3/16 [4.76]
Ø5
EQUALLY SPACED ON
A 5-1/8 [130.18] B.C.
Ø4 [101.60]
FACE
5-1/2 [139.70] O.D.
MOUNTING RING
DWYER INSTRUMENTS, INC.
Ø4-13/16 [122.24]
HOLE REQUIRED FOR
PANEL MOUNTING
1/2 NPT(M) PRESSURE CONNECTION.
SINGLE HIGH PRESSURE CONNECTION
Figure B
(B) Surface Mounting with Remote Relays: Where it is preferred to mount the
(3) Ø3/16 [4.76] MOUNTING
[28.58]
amplier-relay unit separate from the gage assembly, the gage is mounted as shown
in Figure B (without amplier-relay package) or surface mounted as shown in Figure
C. Use the dimensions in Figure D to locate holes.
Figure C Figure F
HOLES EQUALLY SPACED ON A
401/8 [104.78] B.C.
Ø3/4 [19.05] WIRE
CONNECTION HOLE
4-9/32
[108.74]
5
[127.00] SQ
Ø3/16
TYP 4 PLACES
4-9/32
[108.74]
DRILL MAXIMUM 1/8" (3.2MM)
DIAMETER THRU HOLE IN
THIS AREA FOR DRAINAGE
1-1/8
[25.58]
1-1/8
Figure D
(C) Remote Relays Mounting: On factory supplied RMR (remote mounted relay)
units, the amplier-relay package will be furnished attached to a mounting plate as
shown in Figure E. Use the hole layout in Figure F for this option. A ve foot cable
assembly is included for connecting the two components. Longer cable lengths are
available from the factory.
Figure E
5.000
1.812
3.875 SQ.
Figure G
(D) Type 2 Environment Installation Requirements: When installing in an indoor
location where the amplier-relay unit is exposed to falling or dripping water, a drain
opening must be drilled in the bottom of the amplier-relay enclosure. Drill the opening
as shown in Figure G.
4. Pneumatic Connections & Zeroing: After installation but before making pressure
connections, set the indicating pointer exactly on the zero mark, using the zero adjust
screw located at the bottom of the front cover. Note that this adjustment can only be
made with the high and low pressure taps both open to atmosphere.
Connect the high and low pressure taps to positive, negative, or differential pressure
sensing points. Use 1/4˝ diameter metal or other instrument tubing and 1/8˝ NPT
adapters at the PHOTOHELIC
®
pressure switch/gage. Adapters for rubber or soft
plastic tubing are furnished with the instrument for use where this type of connection
is preferred.
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If the PHOTOHELIC
Switch/Gage is not used to sense differential pressure, one
of the pressure taps must be left open to atmosphere. This will allow the reference
pressure to enter. In this case, installation of a Dwyer Instruments, Inc. No. A-331 Filter
Vent Plug or similar tting in the reference pressure tap is recommended to reduce the
possibility of dust entering the instrument.
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Note: If the PHOTOHELIC
switch/gage is over pressured, pointer may “jump” from
full scale back to zero and remain there until the excess pressure condition is relieved.
Users should be aware of possible false zero pressure indications under this condition.
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