Dwyer - A3300-0-LT Photohelic Service Manual

Dwyer - A3300-0-LT Photohelic Service Manual
B-33-A
11/12/02
4:36 PM
Page 1
Bulletin B-33-A
Series A3000 Photohelic® Differential Pressure Switch/Gage
Specifications - Installation and Operating Instructions
2-1/2 [63.50]
1/8 FEMALE NPT HIGH
2-1/16 [52.39]
PRESSURE CONNECTION
2 [50.80]
1/8 FEMALE NPT LOW
PRESSURE CONNECTION
1-1/4
[31.75]
Ø4-3/4
[120.65]
3-7/8 SQ
[98.43]
3/4 CONDUIT
CONNECTION
(4) 6-32 HOLES
EQUALLY SPACED ON
A 5-1/8 [130.18] B.C.
Ø4-47/64
[120.25] Ø5
[127.00]
5/8 [15.88]
3-7/8 [98.43]
5-1/8 [130.18]
5/8 [15.88] PANEL
MAX
3/16 [4.76]
6-3/8 [161.93]
4-3/8 [111.13]
(7-5/8 [193.68])
HOUSING REMOVAL
Ø4 [101.60]
FACE
5-1/2 [139.70]
O.D.
MOUNTING
RING
Fig. A
NOTE: Detailed dimension drawings are available from our Customer Service
Dept. for PHOTOHELIC® switch/gages as installed in two optional enclosures.
For weatherproof housing, request no. 13-700132-00. /For explosion-proof
housing, request no. 13-700113-01.
The PHOTOHELIC® Series A3000 is a versatile 2-in-1 instrument combining a time-proven Magnehelic® differential pressure gage with low/high pressure 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.
SPECIFICATIONS
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® Switch/Gage is factory calibrated for use with scale 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 specified at time of ordering. Ranges below 1″ W.C.
must be used only with scale vertical.
GAGE SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult Factory.
Accuracy: Photohelic®, ±2% of full scale at 70°F (21.1°C). ±3%
on -0 and ±4% on -00 models. Capsu-Photohelic® ± 3% of full
scale at 70°F (21.1°C). ±2% on 43000S models; ±4% on 43215,
43220 and 43500.
Pressure Limits: Photohelic® -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. Capsu-Photohelic®, -20Hg. To 500 psig (0.677 to 34.5 bar).
Temperature Limits: 20° to 120°F.
(-6.67° to 48.9°C) Low temperature option available.
Process Connections: Photohelic®, 1/8˝ female NPT. CapsuPhotohelic® 1/4˝ female NPT.
Size: Photohelic®, 4˝ (101.6 mm) dial face, 5˝ (127 mm) O.D. x 81/4˝ (209.55 mm). Capsu-Photohelic®, 4˝ (101.6 mm) dial face, 5˝
(127 mm) O.D. x 9-3/16” (233.36 mm).
Weight: Photohelic®, 4 lbs. (1.81 kg). Capsu-Photohelic® 5 lbs., 8
oz. (2.49kg). Capsu-Photohelic® Brass 11 lbs., 2 oz. (5.05 kg).
3. Mounting: The PHOTOHELIC® is normally mounted before
making electrical connections. The electrical enclosure is
removable at any time regardless of mounting method.
(A) Panel Mounting: Normal mounting is flush or through panel
as shown in Fig. 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®
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
Fig. B.
SNAP RING GROOVE
SWITCH SPECIFICATIONS
Switch Type: Each setpoint has 2 Form C relays (DPDT).
Repeatability: ±1% of full scale.
Electrical Rating: Photohelic®, 10A @ 28 VDC, 10A @ 120, 240
VAC; Capsu-Photohelic® 10A @ 120 VAC, 6A @ 240 VAC, 60
Hz res. 10A @ 28 VDC.
Electrical Connections: Screw Terminals.
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: Photohelic® UL: File No. E38121, Vol. 1,
Sec. 4; CSA: File No. LR22541-34; CE: EN 61000-6-2: 1999, EN
6100-3-2: 2000, EN 61000-3-3: 2000.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A.
Ø4-13/16 [122.24]
HOLE REQUIRED FOR
PANEL MOUNTING
1/2 MALE NPT PRESSURE CONNECTION.
SINGLE HIGH PRESSURE CONNECTION
FOR SERIES 36000S MODELS.
Fig. B
Phone: 219/879-8000
www.dwyer-inst.com
Fax: 219/872-9057
e-mail: [email protected]
Lit-By Fax: 888/891-4963
B-33-A
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4:36 PM
Page 2
(B) Surface Mounting with Remote Relays: Where it is preferred to mount the amplifier-relay unit separate from the
gage assembly, the gage is mounted as shown in Fig. B
(without amplifier-relay package) or surface mounted as
shown in Fig. C. Use the dimensions in Fig. D to locate holes.
Fig. E
Fig. C
Ø3/16 (4.76 mm)
TYP 4 PLACES
4-9/32
[108.74]
(3) Ø3/16 [4.76] MOUNTING
HOLES EQUALLY SPACED ON A
4-1/8 [104.78] B.C.
Ø3/4 [19.05] WIRE
CONNECTION HOLE
1-1/8
[25.58]
4-9/32
[108.74]
5
[127.00] SQ
Fig. F
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.
1-1/8
[28.58]
Fig. D
(C) Remote Relays Mounting: On factory supplied RMR
(remote mounted relay) units, the amplifier-relay package will
be furnished attached to a mounting plate as shown in Fig.
E. Use the hole layout in Fig. F for this option. A five foot
cable assembly is included for connecting the two components. Longer cable lengths are available from the factory.
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.
If the PHOTOHELIC® 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 No. A-331 Filter Vent Plug or
similar fitting in the reference pressure tap is recommended
to reduce the possibility of dust entering the instrument.
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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ELECTRICAL CONNECTIONS
1. Cover: The amplifier-relay unit has an easy to remove
housing. Remove the three (3) screws as shown in Fig. G
and slide the housing off. Make all the electrical connections
before reinstalling and refastening the housing.
2. Conduit: Electrical access to the connection box portion
of the relay housing is by bottom opening for 3/4″ conduit.
Use of flexible conduit is recommended. It should be supported from the panel or other suitable surface to prevent
the wiring system from exerting undue strain on the instrument. See Fig. G.
COVER MOUNTING
SCREWS
Section E contains the power connections for the control
unit transformer primary. The transformer in turn supplies
reduced voltage power for the LED, phototransistor, amplifier unit, and load relay pull in and hold coils. Connections
must always be made to this section in order to put the unit
in operation. Standard units are designed for 120 VAC input
to the transformer. Special units are also available for other
voltages.
Separate Ground Wire attachment is provided for by a No.
6-32 screw on the mounting bracket near the conduit opening. An additional ground wire connection is located on the
side of the gage body for use when the amplifier-relay unit is
mounted remotely.
Single Set Point instruments are furnished with the right or
high set point components and circuitry in place. These are
connected to Sections A and B of the terminal board. The left
or low set point components are omitted.
4-3/8 [111.13]
CLEARANCE
FOR COVER REMOVAL
FLEXIBLE CONDUIT
SUPPORT CONDUIT
FROM PANEL
Fig. G
3. Terminal or Connection Board Layout: In Fig. H
“Terminal Board,” Section A contains the connections for
the load or slave relay actuated by the high or right set point.
This relay is a double pole, double throw type. The two right
connections are normally closed, the two middle connections are normally open, and the left connections are the
common pair. The relay is in its normal or De-Energized position when pressure is below the right hand set point.
4. Circuit Style: The PHOTOHELIC® is available with several
factory installed optional internal circuits. They are identified
as to style by a label shown in Fig. J. This label is mounted
prominently on the terminal board of each instrument. The
letter H denotes a circuit in which the relay can be made to
latch or remain energized after pressure increase to its set
point.
The letter L denotes a circuit in which the relay can be made
to latch or remain de-energized after pressure decrease to its
set point. Two letters are required to fully identify a dual set
point unit. Thus, circuit style HH, which is standard, is a dual
set point circuit which has provisions for latching on pressure
increase to either set point. Single relay unit or L for the special low latch unit. Units for use with other than standard 120
VAC will be so indicated on the label.
Section D is exactly the same as Section A except that its
load or slave relay is controlled by the low or left set point.
The De-Energized position is below the left hand pointer set
point.
Section B contains the external connections to the holding
coil circuit for the high or right set point relay and Section C
contains similar connections for the low or left set point
relay. The function and use of these connections varies
somewhat depending on the circuit style of the instrument.
See paragraphs 5 and 6 for details.
SECTION C
SECTION B
SECTION D
SECTION A
SECTION E
CAUTION: Do not apply electrical current
to terminals in Sections B and C.
Fig. H
Fig. J
5. Dual Set Point Automatic Reset: Circuit Style HH is used
for simple on-off switching applications. To place in service,
connect load circuits to the appropriate terminals in Section
A (Fig. H) for the right set point and Section D for the left set
point. Note that the N.O. contacts are open when the gage
pressure pointer is to the left of the set point pointers. No
connections are necessary in Sections B and C. Make external ground connections as required and connect power to
Section E for the control unit. To use circuit style LL for automatic reset, a jumper wire must be installed between the two
terminals in Sections B and/or C.
6. Dual Set Point Manual Reset: Circuit Style HH may also
be used for manual reset applications where it is required to
maintain contact on either relay following pressure increase
above its set point. Load or signal connections are made to
the appropriate terminals in Sections A and D (as in paragraph 5 above). Connect terminals in Sections B and C
through normally closed switches or push buttons as shown
in Fig. K. Use of “dry-circuit” type switches such as a Dwyer
Part No. A-601 with paladium, gold, etc. or rotary wiping
action type contacts is recommended. Make external ground
connections as required and connect power to Section E for
the control unit.
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Bulletin B-33-A
Circuit style LL is used for manual reset applications which
require that contact be maintained following pressure
decrease below the set point. Load connections are made
to the appropriate terminals in Sections A and D. A normally open type manual reset switch such as Dwyer Part No. A601 is connected to the terminals in Sections B and C. The
circuit must be “armed by momentarily closing the switch
while the black pointer is to the right of the set point. From
that point on, the circuit will latch on pressure decrease
below the set point and remain latched on pressure increase
until manually reset with the optional switch.
11. Single Set Point Special: Manual reset after actuation
on falling pressure can be obtained by using Circuit Style
SRL. Consult the factory for special units and detailed
instructions regarding their use.
12. Placing in Service: In normal operation each relay is deenergized when the pressure applied to the instrument is
below its set point. Special low-latching units will ordinarily
have to be reset before placing on the line in normal operation.
RESET JUMPERS
RESET
NC
RESET
NC
NO
NO
HI
LO
C
NO
NC
NC
NO
C
C
NO
NC
NC
NO
C
L2
1/3 HP*
120 V
LOAD
L1
CAUTION: Do not apply electrical current to terminals in Sections B and C.
Manual Reset with Circuit HH
*Note: For larger motors, use the Photohelic® in a
maintained contact, 120 Volt Control or Push
Button Circuit of the motor starter.
Fig. K
Fig. L
7. Dual Set Point Automatic and Manual Reset
Combinations: Circuit Style HH may be used with either set
point wired and operating as in paragraph 5 above and the
other set point wired and operating as in paragraph 6.
8. High Low Limit Control - Dual Set Point: Circuit Style
HH may be used to control fans, dampers, pumps, etc.,
between the set points of a PHOTOHELIC® . To accomplish
this, use one set point relay to reset the other as shown in
the wiring diagram Fig. L. In this typical application, the load
(for instance a fan) would be connected to the N.C. contacts
for the right set point relay Section A (Fig. H). On pressure
rise to the right set point, its relay would pull in and hold
even though pressure might then fall below that set point . I
the pressure continued to fall to the left set point, its relay
would automatically be DE-ENERGIZED, return to its normal
position and in so doing, open the holding coil circuit from
Section B (Fig. H). The right set point relay would thus be
reset and the cycle could repeat.
9. Dual Set Point Special Purpose Circuits: Circuit Style
LL may be used where manual reset following maintained
contact on pressure decrease to either set point is required.
Circuit Styles HL and LH are combination units. For special
combinations of features, special units, and detailed
instructions regarding their use, consult the factory.
10. Single Set Point PHOTOHELIC®: The single set point
PHOTOHELIC® is furnished with the right set point only.
Terminals in Sections A and B (Fig. H) are connected to this
relay. Circuit Style SRH is wired for automatic reset as in
paragraph 5 above. Manual reset is accomplished by
adding a normally closed reset switch or push button to the
circuit as described in paragraph 6 above.
©Copyright 2002 Dwyer Instruments, Inc.
13. Failure Mode: The PHOTOHELIC® circuit design provides certain protection in the event of a loss of pressure or
electrical power. In either case, both relays will de-energize,
returning to their normal “zero pressure” state. The exceptions to this are models with center zero ranges. Because the
relays on all standard models are always energized when the
indicating (black) pointer is to the right of their respective set
points, the relay action on loss of pressure will depend on set
point position, since either of them could be located to the
left of zero. As an example; if the left pointer were set at -2
in. w.c. and negative pressure was -3 in. w.c., a loss of that
pressure would allow the black pointer to return to the center and thus cause the low set point relay to energize.
If the LED should burn out, only the left-low relay will deenergize. The right-high relay will react as if pressure were
above its set point and will remain energized even though
pressure might be below that setting. In this situation, only
termination of electrical power will allow the right-high relay
to de-energize.
MAINTENANCE AND SERVICE
Dwyer PHOTOHELIC® Switch/Gages are precision instruments, expertly assembled and calibrated at the factory.
They require no lubrication or periodic servicing. If the interior is protected from dust, dirt, corrosive gases and fluids,
years of trouble-free service may be expected. Zero adjustment should be checked and reset occasionally to maintain
accuracy. Any repairs necessary to either the Dwyer
Magnehelic® pressure gage or electronic components should
be performed by a trained instrument mechanic. In most
cases, this is best accomplished by returning the complete
PHOTOHELIC® Switch/Gage to the Dwyer factory.
Printed in U.S.A. 11/02
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A.
FR# 13-440202-04 Rev.2
Phone: 219/879-8000
www.dwyer-inst.com
Fax: 219/872-9057
e-mail: [email protected]
Lit-By Fax: 888/891-4963
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