Dwyer PS - Manual

PROXIMITY CONTROLS
Phone: 219/879-8000 www.dwyer-inst.com
A DIVISION OF DWYER INSTRUMENTS, INC. Fax: 219/872-9057 e-mail: [email protected]
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A.
Series PSC/PSI Proximity Sensors
Specifications – Installation and Operating Instructions
INTRODUCTION - Proximity Sensors
The Proximity Controls range of proximity sensors includes induc-
tive and Capacitive proximity switches and a Test unit. These are
listed and stocked in our catalog for fast service. Should you need
a non-listed varient please contact the sales office.
Inductive (PSI) switches will detect all metals. Capacitive (PSC)
switches will detect nearly all solids, powders and liquids. The A-
800 Test Unit will give a functionality test to all versions stocked in
the catalog and will test most three wire DC proximity switches
from other manufacturers.
SENSING DISTANCE
Sensing ranges refer to a 1 mm thick square target of earthed mild
steel with sides of 3 x the nominal sensing distance. If the target
is a different material, or of another size, there will be a variation
in the sensing distance.
INSTALLATION (MECHANICAL)
Flush Mounting
Units designed for flush mounting, including all inductives listed in
the catalog, may be fitted in surrounding metal as shown.
Non-Flush Mounting
Units designed for non-flush mounting, including Capacitive
switches, must be separated from teh surrounding metal as
shown.
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.
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
Flush Fitting
Non Flush
Fitting
A= Not Less
Than 3d
Bulletin E-81-PS
E-81-PS:PS bulletin 2/4/10 8:05 AM Page 1