A2 Pressure Switches Important Points! Instruction Bulletin No. 204117

A2  Pressure Switches Important Points! Instruction Bulletin No. 204117
Important Points!
A2 Pressure Switches
Instruction Bulletin No. 204117
Product must be maintained and installed in strict accordance
with the National Electrical Code and Dwyer product catalog
and instruction bulletin. Failure to observe this warning could
result in serious injuries or damages.
For hazardous area applications involving such things as (but
not limited to) ignitable mixtures, combustible dust and
flammable materials, use an appropriate explosion-proof
enclosure or intrinsically safe interface device.
The pressure and temperature limitations shown on the
individual catalog pages and drawings for the specified flow
switches must not be exceeded. These pressures and
temperatures take into consideration possible system surge
pressures/temperatures and their frequencies.
Selection of materials for compatibility with the media is critical
to the life and operation of Dwyer products. Take care in the
proper selection of materials of construction, particularly wetted
materials.
Life expectancy of switch contacts varies with applications.
Contact Dwyer if life cycle testing is required.
Ambient temperature changes do affect switch set points,
since the specific gravity of a liquid can vary with temperature.
Installation
To install the switches, use a suitable wrench on the port and plumb
into place with the proper sealant. For electrical wiring, refer to
wiring codes on the next page and to the specification sheet for the
switch ratings. For low DC loads (<50 mA, TTL logic) use switches
with gold contacts. All the switches are adjustable unless they were
ordered with the IP68 submersible option, in which case they are
factory set and not field adjustable. All switches are maintenancefree.
Adjusting the Set point
Dwyer Products have been designed to resist shock and
vibration; however, shock and vibration should be minimized.
1) Using a 1/8 inch Allen (Hex) wrench, adjust clockwise to
Filter liquid media containing particulate and/or debris to
ensure the proper operation of our products.
Electrical entries and mounting points in an enclosed tank
may require liquid/vapor sealing.
Dwyer Products must not be field-repaired.
Physical damage sustained by the product may render it
unserviceable.
DWYER INSTRUMENTS,INC.
P.O.BOX 373 MICHIGAN CITY, INDIANA 46361, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
Lit-By Fax: 888/891-4963
www.dwyer-inst.com
e-mail: [email protected]
increase the set point and counterclockwise to lower the set
point. (Adjustments are done while applying a known pressure and monitoring the switch’s state.)
2) After verifying the set point re-assemble the switch.
Dimensions
Submersible Option
Specifications
Process Temperature
Ambient Temperature
Switch
1.95”
(50)
-4°F to +250°F (-20°C to +120°C)
-40°F to +250°F (-40°C to +120°C)
SPST, 100 VA, 42V max. (>2 million
.35”
(9)
∅.82”
(∅21)
cycles @ 1,000 psi, max. 200 cycles/min.)
Approvals
Repeatability
Wetted Parts
Diaphragm
Fitting
Electrical Termination
Process Fitting
Deadband
Proof Pressure
CE
5% of Highest Set Point @ 70°F (20°C)
Weight, Approximate
0.14 lbs. (0.06 kg)
Kapton®
Brass
6.3mm (1/4”) Spade or Screw Terminals
G or NPT 1/4”(optional 1/8”)
1-2 psi
500 psi (34.5 bar)
The pressure switch is designed and manufactured in accordance
with Sound Engineering Practice as defined by the Pressure
Equipment Directive 97/23/EC. This pressure switch must not be
used as a “safety accessory” as defined by the Pressure Equipment,
Article 1, Paragraph 2.1.3.
The CE Mark on the unit does not relate to the Pressure Equipment
Directive.
SEE
ORDERING
INFORMATION
HEX 15/16”
(24)
1.12”
(29)
1/8 ALLEN WRENCH
ADJUSTMENT SCREW
.35”
(9)
.35”
(9)
∅.82”
(∅21)
.054”
(14)
15/16” A.F.
(24)
1.67”
(42.5)
SEE
ORDERING
INFORMATION
Maintenance/Repair
Regular maintenance of the total system is recommended to assure sustained optimum performance. These devices are not field repairable and should
be returned to the factory if recalibration or other service is required. After first
obtaining a Returned Goods Authorization (RGA) number, send the unit freight
prepaid to the following. Please include a clear description of the problem
plus any application information available.
Dwyer Instruments, Inc.
Attn: Repair Department
102 Highway 212
Michigan City, IN 46360
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