S600+ Instruction Manual
Revised July-2017 Glossary A-5
Modulator Demodulator; a device used to communicate with other equipment using a
telephone network.
Superimposing one signal upon another.
Motor Operated Valve; a valve that is motorized and requires a signal to drive the
valve open, a signal to drive the valve closed, and has a two signals returning to the
S600 to describe the valve as being open, closed, moving, or illegal.
Random electrical interference.
Memory type that retains data when the power supply is disconnected.
An AGA report developed for the calculation of supercompressibility factors.
Generally, any item that can be individually selected and manipulated. This can
include shapes and pictures that appear on a display screen as well as less-tangible
software entities. In object-oriented programming, for example, an object is a self-
contained entity that consists of both data and procedures to manipulate the data.
Numbers in base 8 (that is, numbers 0 through 8).
Accomplished while the target device is not connected (by a communications link). For
example, “off-line configuration” refers to configuring an electronic file that is later
loaded onto the S600.
Accomplished while connected (by a communications link) to the target device. For
example, “on-line configuration” refers to configuring an S600 while connected to it, so
you can view the current parameter values and immediately load new values.
Digital output that is driven by a transistor and requires external power.
Optical device for connecting signals while maintaining electrical isolation.
Over the preset current limit for the A/D Converter.
Three-term control action that uses Proportional, Integral, and Derivative components
to modify a control output, with the goal of achieving a measured process variable at a
set point.
Communications mode implemented by giving each communication node both server
and client capabilities.
Group of inputs or outputs to the computer.
Precise description of data interchange over a telemetry link.
An order of events set into the S600 to perform a calibration (or “prove”) of flow
balancing, stability checking, or valve-routing.
Platinum resistance thermometer. See also RTD.
Calculation of Compressibility, Relative Density and Line Density using the Solartron
7915 PTZ method.
Random-access memory. Volatile memory that becomes unreliable when power is
removed from the computer.
Liquid relative density: the ratio of the mass of a given volume of liquid at 15°C (or
other standard temperature, such as 60°F) to mass of an equal volume of pure water
at the same temperature. When reporting results, explicitly state the standard
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