Red Lion RECTANGULAR INDUCTIVE PROXIMITY SENSORS Owners Manual
“FLAT PACK” RECTANGULAR INDUCTIVE PROXIMITY SENSORS
METAL
TARGET
CIRCUIT
OSC.
SENSING FIELD
OUTPUT ON
OSCILLATOR STALLED
AMPLITUDE
ABSENT
TARGET
OUTPUT OFF
SENSOR
TARGET APPROACHING
TARGET PRESENT
TARGET ABSENT
IDEAL FOR LIMITED SPACE APPLICATIONS
SENSE FERROUS & NON-FERROUS METAL OBJECTS TO
“ZERO SPEED”
3-WIRE NPN TRUE OPEN COLLECTOR OUTPUTS
2 SIZES & SENSING DISTANCES FOR APPLICATION
VERSATILITY
L.E.D. TARGET INDICATOR
Bulletin No. PSAFP- A
Drawing No. LP0589
Released 03/13
DESCRIPTION & OPERATION
Inductive Proximity Sensors detect the presence of metal objects that come
within range of their oscillating field and provide target detection to “zero
speed”. Internally, an oscillator creates a high frequency electromagnetic field
(RF) that is radiated from the coil and out from the sensor face (See Figure 1).
When a metal object enters this field, eddy currents are induced into the object.
As the metal moves closer to
the sensor, these eddy currents
increase and result in an absorption
of energy from the coil that
dampens the oscillator amplitude
until it finally stops.
Figure 1
MODELS PSAFP1 & PSAFP2
In addition to the coil and oscillator circuit, the 3-wire Models PSAFP1 and
PSAFP2 each contain a Detector Circuit and NPN Transistor Output (See
Figure 2). In these units, the Detector Circuit senses when the oscillator stops,
and turns on the Output Transistor that controls the load. The Detector Circuit
also turns on an integrally case mounted L.E.D., visually indicating when a
metal object is sensed.
These Inductive Proximity Sensors have a maximum sensing distance of
0.078" (2 mm) and 0.393" (10 mm) respectively, and operate over a wide power
supply range (See Specifications Below). They are each housed in plastic with
a top active face. The NPN transistor outputs are true open collector and are
compatible with most Red Lion counter and rate meter input circuits. Maximum
sensing frequencies are 2 KHz and 500 Hz respectively. In addition, the outputs
are overload and short circuit protected. These sensors are shielded for flush
mounting in metal applications.
PSAFP1 AND PSAFP2 SPECIFICATIONS
PSAFP100 PSAFP200
1. Power Supply: +10 to +30 VDC
REVERSE POLARITY PROTECTION
2. Maximum Switching Frequency: 2 KHz 500 Hz
3. Output: NPN Open Collector Output,
V
150 mA max. load
4. Maximum Sensing Distance: 0.078" (2 mm) 0.393" (10 mm)
5. Wire Color Code: Brown = +VDC; Blue = Common;
6. Operating Temperature: -25° to +85°C
7. Construction: NEMA 1, 3, 4, 6, 13 and IEC IP 67
8. Trigger Current for Overload Protection: 170 mA 220 mA
(-14° to +185°F)
@ 15 mA max.
Overload and Short Circuit protected.
= 1.8 V @
SAT
V
200 mA max. load
Black = Output
-25° to +70°C
(-14° to +158°F)
= 1.8 V @
SAT
PSAFP1 and PSAFP2
COIL
OUTPUT TRANSISTORDETECTOR
Figure 2
LED STATES
LED ON (GREEN) POWER ON
LED ON (YELLOW) OUTPUT ENERGIZED
LED ON (FLASHING GREEN) SHORT CIRCUIT WARNING
LED
+VDC
BROWN
OUTPUT
BLACK
COMMON
BLUE
1
PSAFP1, PSAFP2
NPN OPEN
COLLECTOR
TYPICAL HOOKUP
+VDC = BRN
OUTPUT = BLK
COMMON = BLU
TYPICAL COUNTER
INPUT SWITCH SET-UP
+12V
COMM.
CNT.
SRC
123
*
SNK
LO FRQ
HI
LO BIAS
APPLICATION
*
DEPENDENT
HI
51
DIMENSIONS In inches (mm)
PSAFP100
0.217 (5.5)
LED
0.315 (8.0)
0.118 (3.0)
0.630 (16.0)
0.236 (6.0)
PSAFP200
0.315 (8.0)
0.787 (20.0)
Ø 0.177 (Ø 4.5) 2x
Notes:
1. PSAFP100 Housing: Plastic, PA12-GF30
Cable: 2 meter standard length
2. PSAFP200 Housing: Plastic, PBT-GF30-VO
Cable: 2 meter standard length
Ø 0.126 (Ø 3.2) THRU
Ø 0.252 (Ø 6.4) x90°
2.047 (52.0)
0.197 (5.0)
1.102 (28.0)
1.181 (30.0)
1.260 (32.0)
0.315 (8.0)
0.551(14.0)
SELECTION & APPLICATION OF PROXIMITY
SENSORS
Selection of the proper proximity sensor depends on the size, material, and
spacing of the target being sensed and the sensing distance that can be
maintained. The maximum sensing distance is defined as the distance when the
sensor is just close enough to detect a ferrous target whose diameter is equal to
or greater than the sensor diameter. In actual application, the sensing distance
should be between 50 to 80% of the maximum sensing range to assure reliable
detection. For target sizes smaller than the sensor diameter, the maximum
sensing distance can be estimated from the curve (See Figure 3). A further
reduction factor must also be applied if the target material is non-ferrous metal
(See Figure 4). Ideally, spacing between adjacent targets should be at least one
sensor diameter so that the first target completely leaves the sensors field before
the next target appears. Individual targets can still be resolved as separate
objects if this spacing is reduced to 70 or 75% of the sensor diameter, however,
this can introduce a minimum limit on sensing distance that makes adjustment
more critical. All proximity sensors are internally shielded which allows the
sensor face to be flush mounted in metal applications without reducing sensing
distance. In applications where proximity sensors must be placed next to each
other, a distance of at least 1 sensor diameter should separate sensors to
eliminate any frequency interference (See Mounting below).
MAXIMUM SENSING DISTANCE REDUCTION FACTORS
Reduction in the maximum sensing
distance due to decrease in diameter
of ferrous targets.
100
50
% OF MAX. SENSING DISTANCE
0
0.25 .5 .7
RATIO,
TARGET DIAMETER
SENSOR DIAMETER
Figure 3 Figure 4
Typical reduction factors for various nonferrous targets with diameters equal to or
greater than sensor diameter.
MATERIAL
MILD STEEL
STAINLESS
STEEL
MERCURY
LEAD
BRASS
ALUMINUM
COPPER
Nominal sensing range x % sensing
distance = actual sensing range
% SENSING DISTANCE
APPROX. 65%
APPROX. 60%
APPROX. 50%
APPROX. 40%
APPROX. 30%
APPROX. 25%
100%
PSAFP100 and PSAFP200 outputs are NPN open collector outputs. A
PSAFP100 and PSAFP200 may be used as an input to more than 1
indicator or control only if the respective power supplies of each unit
are “unregulated” and can load share. It is recommended to use only
one power supply for sensor power. An indicator or control with a
regulated power supply may not be paralleled.
COUNTER #1
TYPICAL COUNTER
INPUT SWITCH SET-UP
Counter #1 and #2 both contain
unregulated +12 VDC Power
Supplies.
PSAFP1 and PSAFP2
NPN OPEN
COLLECTOR
+VDC (BRN)
OUTPUT (BLK)
COMMON (BLU)
+12V
COMM.
CNT.
COUNTER #2
INPUT SWITCH SET-UP
+12V
COMM.
CNT.
LO BIAS
LO FRQ
SRC
3
1 2
APPLICATION
*
*
DEPENDENT
HI
HI
SNK
TYPICAL COUNTER
SRC
LO FRQ
LO BIAS
123
APPLICATION
*
*
DEPENDENT
HI
HI
SNK
PSAFP200 MOUNTING
A B C D E
30.00 mm 45.00 mm 30.00 mm 30.00 mm 60.00 mm
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