S600+ Instruction Manual
A-6 Glossary Revised July-2017
reference temperature (for example, relative density 15/15°C). [Source API Vocabulary
1994].
Gas relative density: As above except that air is used as the reference instead of
water.
Ideal and Real gas relative density. See Specific Gravity.
Note: Water at 15°C is 999.058 kg/m3.
Water at 60°F is 999.012 kg/m3. [Source API 2540 volume X]
Air at 15°C is 1.2255 kg/m3.
Read-only memory (fixed storage). Typically used to store firmware. Flash memory.
This type of memory cannot be written to by default; however, some modern memory
allows writing to occur under certain conditions.
Voltage standard for serial data transmission.
Resistance thermometer device.
Request to Send. This signal is asserted (logic '0', positive voltage) to prepare the
other device for accepting transmitted data from the flow computer. Such preparation
might include enabling the receive circuits, or setting up the channel direction in half-
duplex applications. When the other device is ready, it acknowledges by asserting
Clear to Send.
Room temperature vulcanizing, typically a sealant or caulk such as silicon rubber.
Device used to take samples of the product in the pipework where it is mounted. This
can either be timed according to throughput or number of samples required in a certain
timeframe.
Codes that limit operator access to software parameters; typically stored in micro
memory.
Ideal gas relative density (specific gravity), Gi is defined as the ratio of the ideal
density of the gas to the ideal density of dry air at the same reference conditions of
pressure and temperature. Since the ideal densities are defined at the same reference
conditions of pressure and temperature, the ratio reduces to a ratio of molar masses
(molecular weights). [Source AGA3 1992]
Real gas relative density (specific gravity), Gr, is defined as the ratio of the real density
of the gas to the real density of dry air at the same reference conditions of pressure
and temperature. To correctly apply the real gas relative density (specific gravity) to the
flow calculation, the reference conditions for the determination of the real gas relative
density (specific gravity) must be the same as the base conditions for the flow
calculation. [Source AGA3 1992]
See also Relative Density (RD).
Note: Real relative density differs from ideal relative density in that the ratio of the gas
compressibilities is also taken into account.
Static random-access memory. Stores data as long as power is applied; typically
backed up by a lithium battery or supercapacitor.
FloBoss™ S600 Flow Computer fitted with the new CPU module with the ColdFire
MPC8313C 333 MHz with integral floating point processor.
An operating system concept that refers to the combination of a program’s execution
and the operating system’s bookkeeping information. Whenever a program executes,
the operating system creates a new task for it.
Transmission Control Protocol/Internet Protocol.
An option that allows the S600 to average process variables based on time, flow or
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