Dwyer PS - Manual (Page 3)

INSTALLATION AND WIRING INSTRUCTIONS
• INDUCTIVES
• CAPACITIVES
• TEST UNIT
INTRODUCTION
The Proximity range includes inductive and Capacitive proximity
switches and a Test unit. These are listed and stocked in out cat-
alog for fast service. Should you need a non listed variant please
contact the sales office.
Inductive switches will detect all metals. Capacitive switches will
detect nearly all solids, powders and liquids, and the A-800 test
unit will give a functionality test to all versions stocked in the cata-
log and will test most three wire DC proximity switches from other
manufacturers.
This range covers many industrial applications.
SENSING DISTANCE
Inductive and Capacitive
Sensing ranges refer to a 1 mm thick square target of earthed mild
steel with sides of 3X the nominal sensing distance. If the target is
of other material, or a different size, there will be variation in the
sensing distance.
INSTALLATION
Flush Mounting
Units designed for flush mounting which include all inductives list-
ed in the catalog may be fitted in surrounding metal (or other mate-
rial) as shown.
Non-Flush Mounting
Units designed for non-flush mounting which includes the
Capacitive switches must be separated from surrounding metal as
shown overleaf.
Proximity Division of
Dwyer Instruments, Inc.
102 Highway 212
P.O. Box 373,
Michigan City, IN 46360-0373
U.S.A
Tel: 219/879-8000
Fax: 219/872-9057
MATERIAL
Mild Steel
Cast Iron
Aluminum Foil
Stainless Steel
Brass
Aluminum
Copper
Water
PVC
Glass
Ceramics
Wood
Beer
Coca Cola
Lubricating Oil CAPACITIVE
1.0
1.0
1.0
1.0
1.0
1.0
1.0
0.9
0.9
0.5
0.4
from 0.2
0.9
0.9
0.1 INDUCTIVE
1.0
1.1
0.9
0.7
0.4
0.35
0.3
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
MATERIAL FACTORS
NOTE: Capacitive switches can, if required, be tuned down to be
fitted flush in metal. See section on sensitivity adjustment.
INSTALLATION (ELECTRICAL)
Single Units
DC units have transistor output, and normally have three wires,
but NAMUR standard DC sensors have only two wires.
3 Wire DC Switch
2 Wire DC Sensor
Note that units with two wires must be connected to their power
supply with a load in series, or they will be damaged. Consult cat-
alog for load rating.
Logic Interface
Proximity sensors may be interfaced with most types of industrial
logic. Most DC units are open collector type and therefore require
an external pull up resistor when used with TTl as shown.
Note that 3 wire DC-Compact V3 bodied switches are designed for
use directly with TTL and have a built-in pull up resistor.
Multiple Units: Parallel
DC sensors may be connected directly in parallel as in shown. The
number (N) of switches is usually only limited by the availability of
sufficient supply current. Note that the compact V bodied switches
have an internal pull-up resistor with a resistance of 12 kilohms.
The maximum number of compact switches in parallel is:
N=Rating Load Current (mA) x 12 Kilohm / V supply.
E-81-PS:PS bulletin 2/4/10 8:05 AM Page 3