2021.08.19
•
REV. 1
• MASS FLOW METER OPERATING MANUAL
13
Setup
Gas Selection
MENU
→
SETUP
→
Active Gas
Gas Select™
Most flow meters are physically calibrated at the factory using air. Gas Select™ allows you
to reconfigure the flow meter to flow a different gas without any need to send it back for a
physical recalibration.
Within this menu, there are a variety of categories (such as
Standard
,
Chromatography
and
Welding
), as well as recent selections, and COMPOSER™ mixes (see below). Each category
will list a subset of available gases and preconfigured mixtures.
As soon as you press
SET
from the gas list, your flow meter will reconfigure its flow rate
calculations to the newly selected gas’s properties. There is no need to restart the device.
Your current gas selection appears just below the unit’s indicator on the right side of the
main display
(
page 10
).
Category and Gas List Controls
•
PAGE
advances the view to the next page of categories or gases.
•
SELECT
(in the category list) opens a list of gases in that category.
•
SET
(in the gas list) immediately loads the gas measurement properties and exits to the
setup menu
.
Using COMPOSER™ Gas Mixes
SETUP
→
Active Gas
→
COMPOSER Mixes
To provide accurate measurements, your flow meter needs to reference the viscosity
of the gas you are flowing through it. The closer you can get to defining your actual gas
composition, the more accurate your flow readings will be. COMPOSER™ is an included feature
of Gas Select™ that lets you define new mixed gas compositions to reconfigure your flow
meter whenever needed.
Wilke’s semi-empirical method is used to define a new gas mixture based on the molar
(volumetric) ratios of the gases in the mixture. You can define these gas compositions to
within 0.01% for each of up to five constituent gases in the mixture. Once you define and
save a new COMPOSER™ gas mix, it becomes part of the Gas Select™ system and is accessible
under the gas category
COMPOSER
User
Mixes
. You can store up to 20 COMPOSER™ gas mixes
on your flow meter simultaneously.
✓
Note:
The COMPOSER™ device firmware does not physically mix gases. It only configures
the device’s calculations to report flow readings more accurately based on the constituent
gases of your defined mixture.
Select any existing mix and press
SET
to immediately configure your device to measure that
gas mixture. To create new mixes, see the next section.
The first page of the Gas Select™
category list.
The
setup menu
.
The Gas Select™ standard gas list.
