Micro Motion RFT9709 Instrukcja Obsługi Strona 113

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Using ProLink
®
Software with Micro Motion
®
Transmitters
99
Configure Menu: Transmitter Variables
continued
Flow units
Configure Menu:
Transmitter Outputs
Configure Menu:
Transmitter Information
Configure Menu: EventsView Menu: Status
Configure Menu:
Characterize
Configure Menu:
Transmitter Variables
To establish a special unit of mass for measuring a gas:
1. In the Configure Transmitter Variables dialog box, select SPECIAL as
the mass flow unit, then click OK.
2. Open the Configure menu, then choose Special Units to open the
Configure Special Units dialog box, depicted in:
Figure 9-4
, page 97 for an RFT9739
Figure 9-5
, page 97 for an RFT9712 or RFT9729
3. Enter the standard (or normal) density of the gas into the ProLink
Conv Fact text box.
The standard or normal density of the gas depends on a reference
temperature, pressure, and composition.
For example, one cubic foot of air has a normal density of 0.075 lb,
so enter
0.075
.
4. From the Time Unit drop-down list, choose the standard time unit for
this measurement.
For example, choose
minute
.
5. Enter an abbreviation (one to four characters in length) for the special
unit of measure in the Flow Text text box. If the transmitter has a
display, this text appears in the flow rate screen. Common units are
SCF
(standard cubic feet) or
Nm
3
(normal cubic meters), followed by
a letter indicating the time unit being used.
For example, enter
SCFM
for
standard cubic feet per minute
as
shown in
Figure 9-6
.
CAUTION
The meter should not be used to measure the
actual volume of gases.
While a special unit for volume of gas may be
established from the Configure Transmitter Variables
dialog box or the Configure Special Units dialog box, it
is not recommended.
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