Adjustable Set Point (AP) -- Allows the user or manufacturer to change the set point (make or break) to any pressure setting within the operating band of the switch.
Alternating Current (AC) -- An electric current that reverses its direction at a given time interval.
Ambient Pressure -- Adjecent pressure, not necessarily atmospheric, immediately surrounding and influencing an uncompensated pressure actuated switch.
Ambient Temperature -- Surrounding temperature conditions (not necessarily atmosheric conditions).
Break -- The point at which the electrical contacts open to disconnect a circuit.
Burst Pressure -- The maximum pressure which may be applied to a switch without causing leakage. Permanent degradation may occur or the unit may become inoperable if burst pressure is exceeded.
Current -- The flow or transport of electric charges along a path or around a circuit.
Deadband -- The difference between actuation and deactuation points of the electrical contacts of a pressure switch.
Differential Pressure -- The difference betweeen a reference pressure and a variable pressure.
Factory Set Point (FS) -- The pressure switch is calibrated and sealed at Endura, so that the set point can not be adjusted without breaking the seal.
Fixed Set Point (FP) -- The pressure switch has a certain operating band that cannot be changed.
Hysteresis -- The phenomenon by which an effect in a component depends not only on the present stimulus, but also on the previous state of the component.
Make -- The point at which the electrical contacts close to complete an electrical circuit.
Maximum System Surge Pressure -- The MAXIMUM pressure including "spikes" that a system may be subjected to.
Pilot Duty -- A load of power factor and high inductive typical of solenoid coils or heater contactor coils.
Pressure -- The force exerted over a surface divided by the area of that surface.
Pressure Fall Set Point -- The control set point is actuated at a decreasing positive or negative pressure.
Pressure Rise Set Point -- The control set point is actuated at an increasing positive or negative pressure.
Pressure Switch -- An instrument that senses a change in pressure and actuates an electrical switching element when a pre-determined pressure point is reached.
Repeatability (Accuracy) -- The ability to consistently maintain a given set point calibration for a set of environmental and operational conditions.
Resistive Load -- An electrical load in which voltage and current are converted to energy in the form of heat; i.e., an electrical heater.
Sample Line Fittings -- Pressure connection to the switch pod.
Set Point -- The exact pressure at which the electrical circuit controlled by the pressure switch changes contacts. A pressure switch may have a set point on either pressure rise or fall, but not both.
Set Point Tolerance -- The maximum allowable setting deviation between two or more production units under all specified environmental conditions.
Snap Acting Switch -- A mechanically operated electric switch having predetermined and accurately controlled characteristics.
SPDT -- A Single Pole Double Throw switch has a common, normally open and normally closed terminals. A single type switch used to control one circuit load.
SPST -- A Single Pole Single Throw switch has a common terminal and either a normally open terminal (SPNO) or a normally closed terminal (SPNC).
Steady State Operating Pressure (Working Pressure) -- The normal pressure of a system which DOES NOT include the maximum surge the system may be subjected to.
Switch Differential (Deadband) -- SEE DEADBAND.
Test Point (sample point or pick-up point) -- Point at which a pressure tap is located on the unit to feed the signal.
Tolerance -- The normal variation in the production of pressure switches of the same model and set point. It affects the actuation value and the reactuation point.
Transducer -- A device which converts energy (pressure) from one form into another (electrical output), always retaining the characteristic variations of the energy being converted.
