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Configuration and Use Manual 53
Optional Configuration
Required Configuration Optional ConfigurationUsing the TransmitterUsing a PROFIBUS Host Required Configuration Optional ConfigurationUsing the TransmitterUsing a PROFIBUS Host Required Configuration Optional ConfigurationUsing the TransmitterUsing a PROFIBUS Host Required Configuration Optional ConfigurationUsing the TransmitterUsing a PROFIBUS Host
The method used to configure volume flow measurement for gas depends on the method you are
using: ProLink II, a PROFIBUS host with the EDD, or PROFIBUS bus parameters. In all cases, you
must:
• Enable gas standard volume flow
• Select the measurement unit to use
• Set the low flow cutoff value
• Specify the standard density (density at reference conditions) of your gas
Note: Using the display, you can only select a volume measurement unit from the set available for the
configured volume flow type. You cannot configure any other parameters.
8.2.1 Using ProLink II
To configure volume flow measurement for gas using ProLink II:
1. Click
ProLink > Configure > Flow.
2. Set
Vol Flow Type to Std Gas Volume.
3. Select the measurement unit you want to use from the
Std Gas Vol Flow Units dropdown list.
The default is
SCFM.
4. Configure the
Std Gas Vol Flow Cutoff (see Section 8.3). The default is 0.
5. If you know the standard density of the gas that you are measuring, enter it in the
Std Gas
Density
field. If you do not know the standard density, you can use the Gas Wizard. See the
following section.
Using the Gas Wizard
The Gas Wizard is used to calculate the standard density of the gas that you are measuring.
To use the Gas Wizard:
1. Click
ProLink > Configure > Flow.
2. Click the
Gas Wizard button.
3. If your gas is listed in the
Choose Gas dropdown list:
a. Enable the
Choose Gas radio button.
b. Select your gas.
4. If your gas is not listed, you must describe its properties.
a. Enable the
Enter Other Gas Property radio button.
b. Enable the method that you will use to describe its properties:
Molecular Weight,
Specific Gravity Compared to Air, or Density.
c. Provide the required information. Note that if you selected
Density, you must enter the
value in the configured density units and you must provide the temperature and pressure at
which the density value was determined.
Note: Ensure that the values entered here are correct, and that fluid composition is stable. If either of
these conditions is not met, gas flow measurement accuracy will be degraded.
5. Click
Next.
6. Verify the reference temperature and reference pressure. If these are not appropriate for your
application, click the
Change Reference Conditions button and enter new values for
reference temperature and reference pressure.