1
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
“FLAT PACK” RECTANGULAR INDUCTIVE PROXIMITY SENSORS
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
@ 15 mA max.
REVERSE POLARITY PROTECTION
2. Maximum Switching Frequency:
2 KHz
500 Hz
3. Output:
NPN Open Collector Output,
Overload and Short Circuit protected.
V
SAT
= 1.8 V @
150 mA max. load
V
SAT
= 1.8 V @
200 mA max. load
4. Maximum Sensing Distance:
0.078" (2 mm)
0.393" (10 mm)
5. Wire Color Code:
Brown = +VDC; Blue = Common;
Black = Output
6. Operating Temperature:
-25° to +85°C
(-14° to +185°F)
-25° to +70°C
(-14° to +158°F)
7. Construction:
NEMA 1, 3, 4, 6, 13 and IEC IP 67
8. Trigger Current for Overload Protection:
170 mA
220 mA
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.
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.
METAL TARGET
CIRCUIT
OSC.
SENSING FIELD
OUTPUT ON
OSCILLATOR STALLED
AMPLITUDE
ABSENT
TARGET
OUTPUT OFF
SENSOR
TARGET APPROACHING
TARGET PRESENT
TARGET ABSENT
Figure 1
Bulletin No. PSAFP- A
Drawing No. LP0589
Released 03/13
Tel +1 (717) 767-6511
Fax +1 (717) 764-0839
www.redlion.net
METAL TARGET
CIRCUIT
OSC.
COIL
PSAFP1 and PSAFP2
OUTPUT TRANSISTOR
DETECTOR
LED
+VDC
BROWN
OUTPUT
BLACK
COMMON
BLUE
Figure 2
1 2 3
SR
C
LO FR
Q
LO BIAS
SN
K
HI
HI
*
APPLICATION
DEPENDENT
TYPICAL COUNTER
INPUT SWITCH SET-UP
PSAFP1, PSAFP2
+12V
COMM.
CNT.
NPN OPEN
COLLECTOR
+VDC = BRN
OUTPUT = BLK
COMMON = BLU
*
TYPICAL HOOKUP
LED STATES
LED ON (GREEN) POWER ON
LED ON (YELLOW) OUTPUT ENERGIZED
LED ON (FLASHING GREEN) SHORT CIRCUIT WARNING
