Glossary Of Terms | 7-3
ppmv Parts per million by volume
ppmw Parts per million by weight
Process Pressure The pressure of the process gas, expressed in one of various
possible units. Only required when engineering units of “dew-
point” are selected.
Resonance Frequency The frequency at which the QCM operates.
RS-232 A serial communication protocol, in which the RS-232 serial
output of a Model 3050 Analyzer may be directly connected to
one of the COM ports of a personal computer (PC). Distance
between the analyzer and the PC is limited to a maximum of 10
meters.
RS-485 A serial communication protocol, in which the RS-485 serial
output of a Model 3050 analyzer may be input to a converter,
which converts it to RS-232 protocol, then input to one of the
COM ports of a PC. Alternatively, RS-485 may be run directly
into a PC with an RS-485 interface board installed. RS-485 may
be run in either 2-wire mode, or 4-wire mode, over distances
up to 1000 meters between the analyzer and the PC or convert-
er.
Sample Gas that is being measured for moisture content.
SCCM Standard cubic centimeters per minute (101.3 Kpa, 0°C)
Sensor Frequency Signal frequency produced by the QCM module. This frequency
is a function of moisture content of the sample gas.
Sensor Saver A mode in which the analyzer timing is conigured such that
the reference gas is lowing for a greater portion of time than
the sample gas. This helps to prolong the life of the QCM sen-
sor.
SLPM Standard liters per minute (101.3 Kpa, 0°C)
Span Adjustment The adjustment of the analyzers response to match the target
value of the moisture generator. This adjustment is normally
performed after the veriication cycle.
System Alarm The analyzer operating condition which requires prompt user
attention.
Tabular Display A table, on which results from one or more 3050 analyzers are
displayed in real-time.
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