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PNP, NPN, 2-Wire and NAMUR Inductive Sensors
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Switch & Sensor Specifications
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| Moniteur VPTs
are available with a wide variety of
industry proven inductive sensors for today's advanced process
PLCs. Whether your process control system requires PNP, NPN, or
NAMUR Intrinsically Safe rated sensors, Moniteur can supply the
preferred position transmitter. Standard sensors available are
shown in the table below: |
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Sensor Types Available
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Sensor
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Type
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Rating
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FM Approval
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P&F NBB3-V3-Z4
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2 Wire DC, Normally Closed
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4-100 mA; 5-60 VDC
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Non Incendive
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P&F NJ2-V3-N
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2 Wire NAMUR
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5-25 VDC
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Intrinsically Safe
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P&F NBB2-V3-US
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2 Wire AC/DC
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5-200 mA; 10-140 VAC/VDC
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Non Incendive
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| P&F NBB2-V3-E0 |
3 Wire NPN DC, Sinking
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100 mA max; 10-30 VDC
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Non Incendive
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P&F NBB2-V3-E2
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3 Wire PNP DC, Sourcing
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100 mA max; 10-30 VDC
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Non Incendive
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About Inductive Sensors
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Inductive sensors are "solid state"
(without moving parts) and are the most reliable of sensing
methods, with a MTBF over 20 million cycles. Inductive Sensors
have three parts of operation - the oscillator, triggering
circuit and switching amplifier. The oscillator generates
a high-frequency electromagnetic field in the sensor's target
area. When a ferrous metal target enters the electromagnetic
field (target area), eddy currents created in the target
by the oscillator increase the load on the oscillator. At
a specific load, the trigger circuit senses the reduction
in oscillation and signals the switching amplifier to change
the signal. Inductive Sensors consume electric power to
operate, and must have approval to be used in hazardous
areas (see table). |
| NAMUR
inductive sensors operate without
the amplifier circuitry in the sensor, allowing use in all
hazardous areas. The required signal amplifier must be installed
externally in the safe area. |
| Hazardous
areas rated Division 2. The P
& F sensors listed are FM approved for general purpose
or hazardous areas rated Division 2, according to the NEC. |
| Intrinsically
Safe. NAMUR Inductive Sensors
are rated Intrinsically Safe and must be used with an approved
current and voltage limiting barrier. |
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