Glossary of Terms: N

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Metal brought into the active field of a NAMUR type proximity sensor causes its current consumption to change. This change in current consumption or the change of the sensor’s internal resistance is used as output signal. In conjunction with properly homologated remote amplifiers NAMUR sensors may be operated in hazardous areas (for more information consult also ATEX).
National Bureau of Standards (NBS)
Now called the National Institute of Standards Technology (NIST).
National Electrical Code (NEC)
A set of specifications devised for the safe application and use of electric power and devices in the United States.
National Electrical Manufacturers Association (NEMA)
A United States association that establishes specifications and ratings for the manufacture of electrical components and apparatuses. Ratings of an enclosure's ability to provide a degree of protection against contact with equipment and against specified environmental conditions. Conformance to these standards by manufacturers is voluntary.
  Learn more about NEMA ratings here.
National Institute of Standards and Technology (NIST)
A United States government agency responsible for establishing scientific and technical standards. Formerly the National Bureau of Standards.
National Pipe Thread (NPT)
The taper pipe thread standard used in North America.
The physical interconnection of devices sharing a communications protocol.
See National Institute of Standards and Technology
A device with a direct point of access to a network.
Any unwanted electrical signals contaminating the signal to be measured and obscuring the information content. May be electronic noise which is an artifact of semiconductor construction techniques and is not reducible. Noise may also be caused by environmental factors, as a result of poor positioning or screening of signal wiring. This may result in mains frequency or RF pickup contaminating the required signal.
Noise, Electrical
Noise results from the presence of undesirable electrical voltages or current. It causes devices to operate erratically (if the noise is on the supply line to a device), or produces false information on erratic operation if present on wires carrying signals from the output of a device to the load. Noise can be present in the supply or picked up on lines in many ways. Pick-up from noisy adjacent wires or metal parts is possible. Good wiring practice and/or additional parts can be used to diminish the effects of noise.
Nominal Sensing Distance
Approximate dimension value measured from the face of the sensor to the nearest point of the target. It does not take into consideration manufacturer's tolerance or operational variables. Also known as the operating point.
A product outside manufacturing limits but not necessarily defective.
Non-Destructive Testing
Method of inspecting materials and products without affecting their subsequent properties and performance. Abbreviation NDT.
Inability under normal operation to ignite a hazardous mixture.
Signifies that the relationship between output and input cannot be represented by a single straight line.
Non-modulated Controls
Controls designed for indoor applications subject to neither bright ambient light nor extreme vibration. Usually incandescent lamp controls, scanners and light source-photoreceiver pairs.
Normal Contact Position
The position of a switch that exists when no force is applied to the plunger.
Normal High
The state of a control in which the output is high (logic1) in voltage in the rest (Off) condition.
Normal Mode Rejection
The ability of an electrical device to filter out noise superimposed on the signal and applied across the SIG HI to SIG LO input terminals. Normally expressed in dB at 50/60 Hz.
Process of creating sensor interchangeability.
Normally Closed (NC)
During the conditions which are defined as "normal", the output state of the sensor is conducting. For inductive, capacitive and My-Com, normal is defined as no target present. For photo-electric, normal is a "dark" receiver.
Normally Low
The state of a control in which the output is low (logic 0) in voltage in the rest (Off) condition.
Normally Open (NO)
The opposite sense from Normally Closed.
A transistor consisting of two N-type regions separated by a P-type region.
NPN - Current Sinking
An output which supplies a path to ground. The load is between the output and +Vs.
NPN - Output
An NPN output acts as an electronic switch from the output to 0 Volt. The load is switched to +VS. If the output is switched (if "light" is received in a light operate mode or "no light" in a dark operate mode) a current flows from +VS through the load and via the output transistor and the reverse polarity protection diode to 0 Volt. The voltage between the output and 0 Volt is called the voltage drop. The voltage protection prevents damage to the output if spikes occur.
N-Type Thermocouple
Nicrosil-Nisil thermocouple with a temperature range of -200 to 1200 Degrees C.
The condition when the pressure on each side of the sensing diaphragm is equal.
Null Offset
The electrical output present, when the pressure sensor is at null.
Null Temperature Shift
The change in null output value due to a change in temperature.
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