Sierra RedyCompact Meter, Инструкция по эксплуатации, Страница: 13 / 73

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The reference value for all units that are not
“Normal” or “Real” it has to be defined with the
purchase order. It cannot be changed after the units has been delivered.
On the label of the RedyCompact we will mention a reference condition. This reference condition is
for the “Standard” units only. The “normal” units will always be 0°C and 1013.25 mbara.
In future version of the firmware the reference conditions will be adjustable in the menu.
Gas flow in general can be expressed in one of the following:
•
Volumetric Flow: (f.i. l/min). This theoretically cannot be measured by the RedyCompact
because it is volume. The RedyCompact measures mass flow . However, due to regional
requirements we still have it as a flow unit that is selectable. Units shown as volume (l/min)
refer to the custom
er defined reference conditions (Same as “standard”).
•
Real Mass Flow : (f.i. kg/h). This refers to true mass units per time unit. The RedyCompact
can measure this and you can select this type of unit from the menu.
•
Normalized Volumetric Flow : Normalized
means that the units are “translated” to
predefined pressure and temperature conditions. Normalized or Normal Conditions refers to
0°C and 1013.25 mbar absolute. You can select this type of unit from the menu of the
RedyCompact. These units are mostly used in Europe and China.
•
Standardized Volumetric Flow : Standardized means that the
units are “translated” to
predefined pressure and temperature conditions. Standardized or Standard conditions
refers to 20°C (68°F) and 1013.25 mbar (=760 mmHg) absolute. You can select these type
of units from the menu of the RedyCompact. These units are mostly used in the USA.
Standardized can also refer to other reference conditions (f.i. Natural Gas industry often
uses 15°C and 1013.25 mbar absolute. In the semicon world they often use 25°C and
1013.25 mbara. Please define and mention these reference condition at the time of your
order.
1.16.
CMOS technology
The Redy measuring and control devices are equipped with an innovative CMOS semiconductor
sensor that sets new standards for accuracy, speed and measurement dynamics.
With our CMOS technology the sensor element, amplifier and A/D converter form a single silicon
chip.
Important Note
Please note that reference condition relating to Normalized or Standardized
volumetric flow are
not the operating conditions. According to the ideal gas
law, the gas volume will change by 0.35% per K.
Important Note
Please note that Sierra standard uses the following densities for their main
3 gasses: Air: 1.293 gr/m3, N2: 1.2504 gr/m3, O2: 1.429 gr/m3 (All at 0°C
and 1013.25 mbar absolute). If you use other densities or need additional
information for other gasses, please contact the factory. Densities need to
be defined before manufacturing and cannot be adjusted once the unit has
been delivered.