Electrical Connections - W.E. Anderson H3 Serie Especificaciones – Instrucciones De Operación E Instalación

INSTALLATION
1. LOCATION: Select a location where the temperature limit of
220°F (104°C) will not be exceeded. Locate the switch as close as
possible to the pressure source for best response. Longer lengths
of tubing will not affect the accuracy of the actuation point but can
increase response time slightly.
2. MOUNTING: Avoid mounting surfaces with excess vibration
which could cause false actuation when pressure is near set-point.
Attach switch with two 3/16˝ screws or bolts (not included) through
mounting bracket. Normal position is with housing vertical.
3. PRESSURE CONNECTION: Connect source(s) of pressure,
vacuum or differential pressure to the 1/8˝ NPT ports as follows:
A. Differential Pressures – Connect higher pressure to High
Pressure port (bottom) and lower pressure to Low Pressure port
(side).
B. Pressure Only – Connect a single positive pressure to High
Pressure port on bottom and leave Low Pressure port on side
vented to atmosphere.
C. Vacuum Only – Connect a single negative (vacuum) pressure
to Low Pressure port on side and leave High Pressure port on
bottom vented to atmosphere.
4. ELECTRICAL CONNECTIONS: Either one or two SPDT snap
switches are provided with normally open contacts closing and
normally closed contacts opening when pressure or vacuum
increases beyond the set-point.
A. Wire in accordance with local electrical codes.
B. Wire lead models – Thread wires through conduit and
connect to leads from snap switch(es).
Black=Common, Red=Normally Closed, Blue=Normally Open
C. Terminal block models – Loosen screws on terminal block(s),
insert stripped and tinned wires in side openings and tighten
screws. Black=Common, Red=Normally Closed, Blue=Normally
Open
EC-Type Certificate Installation Instructions:
Cable connection
The cable entry device shall be certified in type of explosion
protection flameproof enclosure "d", suitable for conditions of use
and correctly installed. For ambient temperatures over 70°C, cable
and cable glands suitable for at least 95°C shall be used.
Conduit connection
An Ex d certified sealing device such as a conduit seal with setting
compound shall be provided immediately to the entrance of the
valve housing. For ambient temperatures over 70°C, the wiring
and setting compound in the conduit seal shall be suitable for at
least 95°C.
D. Ground Screws – Two grounding connections are furnished;
one inside housing with green headed machine screw and one on
exterior with threaded stud and nut. Use either one.
E. ATEX units only: The "T" class is dependent upon the media
or ambient temperature, whichever is higher. The approved ratings
are -20°C ≤ T amb ≤ 75°C T6.
Replace cover after wiring connections are complete.
Limited Warranty: The Seller warrants all Dwyer Instruments, Inc. and equipment to be free from defects in workmanship or material under normal use and service for a period of one year from date of shipment. Liability under this warranty is limited
to repair or replacement F.O.B. factory of any parts which prove to be defective within that time or repayment of the purchase price at the Seller's option provided the instruments have been returned, transportation prepaid, within one year from the
date of purchase. All technical advice, recommendations and services are based on technical data and information which the Seller believes to be reliable and are intended for use by persons having skill and knowledge of the business, at their own
discretion. In no case is Seller liable beyond replacement of equipment F.O.B. factory or the full purchase price. This warranty does not apply if the maximum ratings label is removed or if the instrument or equipment is abused, altered, used at ratings
above the maximum specified, or otherwise misused in any way.
THIS EXPRESS LIMITED WARRANTY IS IN LIEU OF AND EXCLUDES ALL OTHER REPRESENTATIONS MADE BY ADVERTISEMENTS OR BY AGENTS AND ALL OTHER WARRANTIES, BOTH EXPRESS AND IMPLIED. THERE ARE NO IMPLIED
WARRANTIES OF MERCHANTABILITY OR OF FITNESS FOR A PARTICULAR PURPOSE FOR GOODS COVERED HEREUNDER.
Buyers Remedies: THE BUYER'S EXCLUSIVE AND SOLE REMEDY ON ACCOUNT OF OR IN RESPECT TO THE FURNISHING OF NONCONFORMING OR DEFECTIVE MATERIAL SHALL BE TO SECURE REPLACEMENT THEREOF AS AFORESAID,
THE SELLER SHALL NOT IN ANY EVENT BE LIABLE FOR THE COST OF ANY LABOR EXPENDED ON ANY SUCH MATERIAL OR FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES TO ANYONE BY REASON OF THE FACT
THAT IT SHALL HAVE BEEN NON-CONFORMING OR DEFECTIVE.
W.E. ANDERSON DIV., DWYER INSTRUMENTS, INC.
P.O. BOX 358 • MICHIGAN CITY, INDIANA 46361 U.S.A.
INTERNAL
GROUND
SCREW
EXTERNAL
GROUND
SCREW
ADJUSTMENT
1. To change the set-point, connect tubing or piping from high
pressure port on bottom to one leg of a tee. Connect the second
leg to a pressure gage of known accuracy and in an appropriate
range. The third leg should be connected to a controllable
pressure source.
2. Connect a volt/ohm meter or other circuit tester to snap switch
to indicate when switching occurs.
3. Slowly apply pressure to the system and note the pressure at
which switching occurs, If adjustment is necessary, turn the
adjustment screw (located internally at center next to snap switch)
clockwise to raise or counterclockwise to lower the actuation
point. When the required setting has been reached, exercise the
switch through two or three additional cycles to verify consistent
operation.
MAINTENANCE
The moving parts of these switches need no maintenance or
lubrication. The set-point is the only user adjustment. On models
with optional drain fitting, periodically rotate small captive screw
from side to side several times to keep drain path clear. Repairs to
be conducted by Dwyer Instruments, Inc. Units in need of repair
should be returned to the factory prepaid.
CAUTION: Make sure conduit or cable are properly sealed.
Electrical components must be kept free of moisture, including
condensation, at all times. To prevent ignition of hazardous
atmosphere, disconnect the device from the supply circuit
before opening. Keep assembly tightly closed when in
operation.
Phone: 219/879-8000
Fax: 219/872-9057
SET-POINT
ADJUSTMENT
SCREW
TERMINAL
BLOCK
DRAIN /
BREATHER
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