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Glossary of terms used on this site

There are 823 entries in this glossary.
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Term Definition
Salt Bridge

The salt bridge of a reference electrode is that part of the electrode which contains the filling solution to establish the electrolytic connection between reference internal cell and the test solution. Auxiliary Salt Bridge: A glass tube open at oneend to receive intermediate electrolyte filling solution, and the reference electrode tip and a junction at the other end to make contact with the sample.

Salt Effect (fx)

The effect on the activity coefficient due to salts in the solution.


Scientific Apparatus Makers Association. An association that has issued standards covering platinum, nickel, and copper resistance elements (RTDs).

Sampling Rate

The frequency with which samples of a physical variable, such as sound are taken. The higher the sampling rate, the more closely the digitized result resembles the original.

SCADA (Supervisory Control and Data Acqu

The level of applications that monitor and control devices such as programmable controllers. These systems are usually PC or workstation based.

Scan Time

The time to completely execute a PLC program once, including I/O update.


Saturated calomel electrode.


Ssilicone controlled rectifier.


To move all or part of the screen material up to down, left or right, to allow new information to appear.

SDS (Smart Distributed System)

An advanced bus system for intelligent sensors and actuators developed by Honeywell Inc., Micro Switch Division. The SDS specification covers physical layer and application layer. Smart Distributed System devices have advanced device-level functions, system and device diagnostics.

Seal Bushing

(Sliding-Stem Control Valve Terminology) Top and bottom bushings that provide a means of sealing the piston actuator cylinder against leakage. Synthetic rubber O-rings are used in the bushings to seal the cylinder, the actuator stem, and the actuator stem extension.

Seal Ring

(Rotary-Shaft Control Valve Terminology) The portion of a rotary-shaft control valve assembly corresponding to the seat ring of a globe valve. Positioning of the disk or ball relative to the seal ring determines the flow area and capacity of the unit at that particular increment of rotational travel. As indicated above, some seal ring designs permit bi-directional flow.


(Sliding-Stem Control Valve Terminology) The area of contact between the closure member and its mating surface that establishes valve shut-off.

Seat Leakage

(Control Valve Functions and Characteristics Terminology) The quantity of fluid passing through a valve when the valve is in the fully closed position with pressure differential and temperature as specified.

Seat Load

(Sliding-Stem Control Valve Terminology) The net contact force between the closure member and seat with stated static conditions. In practice, the selection of an actuator for a given control valve will be based on how much force is required to overcome static, stem, and dynamic unbalance with an allowance made for seat load.

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