The ability of a special set of photo electric sensors
to distinguish targets against various backgrounds and of
Banking screws - made of hardened steel - provide
limited mechanical protection to the inductive sensors
buried therein when hit by an object. Advantage: very
robust, quick and easy change of sensors.
Self-contained switching unit. It can be used alone, gang-mounted, built
into assemblies or enclosed in metal housings.
The rate of information transfer in serial
communications, measured in bits per second.
Best Fit Straight Line (BFSL)
Method for defining linearity. A straight line placed on a sensor output
curve such that half the data points lie above and half below that line. The
method for determining BFSL, is the sum of least squares.
Compensate input for drift of an input value due to deterioration of a
sensor or other cause.
Bidirectional Differential Pressure Sensor
Differential pressure sensor allowing the greater input pressure to be
applied to either pressure port.
This code type is constructed similarly to the decimal
system, but has only the digit values "0" and "1".
Binary Coded Decimal (BCD) Code
To avoid converting a decimal number into a binary
number, instead of using natural binary code, often only the
individual digits of the decimal number are encoded in
An ideal surface that absorbs all incident radiation,
regardless of wavelength, the direction of incidence and
polarization. It radiates the maximum energy possible for
given spectral and temperature conditions. A blackbody has
an emissivity of 1.00. See alsoEmissivity.
The emitter sends a short pulsed signal with a
relatively long pause between two pulses. The light energy
of the LED can therefore be enormously increased. If emitter
and receiver are mounted in the same housing, the receiver
is clocked to the emitted pulse. Interference is therefore
suppressed 98% of the time.
Blind Range ST
Reliable object recognition is not possible within the
blind range (St). Objects within this blind range may cause
false switching of the sensor.
To open an electrical circuit.
Minimum distance between separated mating contacts in their fully open
British Thermal Unit (BTU)
In specific terms, a BTU is the amount of energy required to heat one pound
of water (beginning at 60 degrees F and 14.696 psia) one degree Fahrenheit. An
easier way to visualize this amount of energy is to burn a standard wooden match
stick. The full burning of the match stick releases approximately one BTU.
Change from manual mode to automatic mode of control, or vice versa, without
change in control signal to the process.
Burnout (Sensor Break Protection)
If input fails, indicated PV signal increases (upscale) or decreases
(downscale) with indication on the interface.
A power control method that repeatedly turns ON and OFF
full AC cycles. Also called zero-cross fire, it switches
close to the zero-voltage point of the AC sine wave.
Variable-time-base burst fire selectively holds or transits
AC cycles to achieve the desired power level.
Specified pressure that will rupture the sensing element but not the sensor