Device Setup
January 2023
•
Rev. 0
• Standard Devices User Manual
23
Device Setup
Gas Selection
Mass Flow Devices
In most cases, your mass flow device was physically calibrated
at the factory using air. Gas Select™ allows you to reconfigure
the device to flow a different gas without any need to send
it back for a physical recalibration. The device is also able to
be programed to measure custom mixtures of gases.
Gas Select™
MENU
→
SETUP
→
Active Gas
Within this menu, there are a variety of categories (such as
Standard
,
Chromatography
and
Welding
), as well as recent
selections, and COMPOSER™ mixes (see next page). Each
category lists a subset of available gases and preconfigured
mixtures.
As soon as you press
SET
from the gas list, your device
reconfigures 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 engineering
units on the right side of the
main display
(see
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
.
COMPOSER™ Gas Mixes
MENU
→
SETUP
→
Active Gas
→
COMPOSER Mixes
To remain accurate, your mass flow device needs to reference
the viscosity of the gas you are flowing through it. The more
closely you can define 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 controller on the fly.
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 controller.
✓
Note:
The COMPOSER™ is device firmware,
and 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.
First page of the Gas
Select™ category list.
Setup menu
.
Gas Select™ standard gas list.
The
COMPOSER™ menu
with
the new custom mix.
