Red Lion PSA - INDUCTIVE - Manual

1
.256
(6.5)
DIA.
1.181 (30) 6.56 ′ (2 METERS)
CHROMED
BRASS CASE
PVC JACKET
2-CONDUCTORS
#24 AWG
.118 (3.0)
1.18 1.57 (40)
1.74 (44)
PVC JACKET
LED
#20 AWG
2 CONDUCTORS
6.56' (2 METERS)
1.42 (32) ACROSS FLATS
.39 (10) THICKNESS
PLASTIC CASE & JAM NUTS
(30)
M30 X 1.5
(ISO 68 METRIC
STRAIGHT THREADING)

SENSE FERROUS & NON-FERROUS METAL OBJECTS TO
“ZERO SPEED”

2-WIRE CURRENT SOURCE (NAMUR) & 3-WIRE NPN TRUE
OPEN COLLECTOR OUTPUTS

5 SIZES & 3 SENSING DISTANCES FOR APPLICATION
VERSATILITY

L.E.D. TARGET INDICATOR (PSA 2B, 6B, 7B, & 8B)
INDUCTIVE PROXIMITY SENSORS
METAL TARGET
CIRCUIT
OSC.
COIL
PSA 1B, 2B
BRN
BLUE
> 2.2mA-NO METAL
< 1mA-METAL SENSED
+VDC
CNT.
Vs Rs
Figure 2
Bulletin No. PSAB-D
Drawing No. LP0443
Released 05/13
Tel +1 (717) 767-6511
Fax +1 (717) 764-0839
www.redlion.net
DESCRIPTION & OPERATION
Inductive Proximity Sensors detect the presence of metal objects which come
within range of their oscillating field and provide target detection to “zero
speed”. Internally, an oscillator creates a high frequency electromagnetic field
(RF) which 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 which
dampens the oscillator amplitude
until it finally stops.
MODELS PSA-1B & 2B
The 2-wire Models PSA-1B and 2B contain only the coil and oscillator
circuit (See Figure 2). With no metal object being sensed, the circuit oscillates
and draws greater than 2.2 mA of supply current. As a metal object of sufficient
size is brought into the sensing field, the oscillator amplitude dampens and
finally stops, resulting in less than 1 mA of circuit current being drawn. This
greater than 2.2 mA to less than 1 mA change in circuit current between
oscillating and non-oscillating conditions is converted into a usable voltage
signal (V
S
) by placing a resistor (R
S
) in series with the sensor leads.
MET
AL
TA
RGET CIRCUIT
OSC.
SENSING FIELD
] PSA1B, or 2B OUTPUT
] PSA6B, 7B, or 8B OUTPUT OUTPUT ON
<1mA
OSCILLATOR STALLED
AMPLITUDE
ABSENT
TARGET
>2.2mA
OUTPUT OFF
SENSOR
TARGET APPROACHING
TARGET PRESENT TARGET ABSENT
Figure 1
PSA-1B & PSA-2B SPECIFICATIONS
1. Power Supply:
PSA-1B PSA-2B
+5 to +30 VDC
2. Maximum Switching Frequency: 5 KHz 500 Hz
3. Output:
Less than 1 mA Target Sensed; Greater
than 2.2 mA No Target.
4. Maximum Sensing Distance: 0.059" (1.5 mm) 0.394" (10 mm)
5. Wire Color Code: Brown = +VDC; Blue = Count
6. Operating Temperature: -25°C to +70°C (-13°F to +158°F)
7. Construction: NEMA 1, 3, 4, 6, 13, and IEC IP 67.
DIMENSIONS In inches (mm)
PSA-1B
PSA-2B