Dwyer SSR-15 - Manual

Solid State Relay Model SSR-15
Instruction Bulletin
For use as “intrinsically safe switch connections” to non-voltage producing
sensors in the hazardous location. When the SSR installation is in accor-
dance with this guide, these switch terminals are suitable for connection to
Class I; Division 1,2; Groups A, B, C & D and Class II; Division 1, 2; Groups
E, F, G and Class III, as defined by Article 500 of the National Electric Code.
IMPORTANT!
Read the following carefully and completely
before installing or connecting SSR units:
1. Associated Equipment - Caution: The SSR must be mounted outside the
hazardous area. Only the switch or sensor terminals provide an intrinsically
safe switch circuit (see Fig. 1.) [Exia] means associated equipment:
“Appareillage connexe”; located in safe area.
Note: For 120V application, only one fuse is required in the ungrounded
circuit of the input line.
** Required torque on these terminals not to exceed 10 IN-LB on
stranded wire; 8 IN-LB on solid wire.
LOAD Neutral
VAC
Hot
FUSE F1
SSR
[Exia]
**
Non-Hazardous
Location
Simple
Apparatus
Hazardous
Location
Fig. 1.
Connection Diagram: Dwyer SSR Models
DWYER INSTRUMENTS,INC.
P.O.BOX 373 MICHIGAN CITY, INDIANA 46361, U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: [email protected]
Lit-By Fax: 888/891-4963
Important Points!
Product must be maintained and installed in strict accordance with the National Electrical
Code and Dwyer technical brochure and instruction bulletin. Failure to observe this warn-
ing could result in serious injuries or damages.
An appropriate explosion-proof enclosure or intrinsically safe interface device must be
used for hazardous area applications involving such things as (but not limited to) ignitable
mixtures, combustible dust and flammable materials.
Pressure and temperature limitations shown on individual catalog pages and drawings
for the specified Dwyer products must not be exceeded. These pressures and tempera-
tures take into consideration possible system surge pressures/temperatures and their fre-
quencies.
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; particu-
larly 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.
Dwyer products have been designed to resist shock and vibration; however, shock and
vibration should be minimized.
Liquid media containing particulate and/or debris should be filtered to ensure proper
operation of Dwyer products.
Electrical entries and mounting points may require liquid/vapor sealing if located in an
enclosed tank.
Dwyer products must not be field repaired. Physical damaged sustained by the product
may render it unserviceable.
3. Installation of Sensor Switch and Running of Field Wiring: (Cont)
Reference: Item D, previous page:
SSR-15
GROUP CAPACITANCE INDUCTANCE
A & B
0.6 uf 1.3 mh
C, E 1.9 uf 5.4 mh
D,F,G 1.9 uf 10 mh
Example: Typical values of capacitance for a twisted pair of copper wires
is between 20 and 60 pf per foot. Using a maximum value of 60 pf/Ft,
groups A & B could have a run of 1500+ feet with safety. Inductance of a
typical twisted pair is between 0.10 and 0.20 uh/Ft, thus making a cable
run in this example essentially determined by the capacitance.
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