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:
Sensor Types Available
| Sensor Types Available | ||||
|---|---|---|---|---|
| Sensor | Code | Type | Rating | FM Approval |
| P&F NJ2-V3-N | 8 | 2 Wire NAMUR | 5-25 VDC | Intrinsically Safe |
| P&F NBB3-V3-Z4 | K | 2 Wire DC, Normally Open | 4-100 mA; 5-60 VDC | Non Incendive |
| P&F NBB2-V3-US | Q | 2 Wire AC/DC | 5-200 mA; 10-140 VAC/VDC | Non Incendive |
| P&F NBB2-V3-E0 | M | 3 Wire NPN DC, Sinking | 100 mA max; 10-30 VDC | Non Incendive |
| P&F NBB2-V3-E2 | N | 3 Wire PNP DC, Sourcing | 100 mA max; 10-30 VDC | Non Incendive |
About Inductive Sensors
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.