6
Getting Started
Getting Started
Getting to Know Your Mass Flow Meter
The Flow Meter Display
The figure to the right identifies the various features of the flow meter display.
Highlights
pressure
in the center of the device.
Highlights
temperature
in the center of the device.
Tares
the device’s flow measurement (
page 10
).
Highlights
volumetric (actual) flow
rate in the center of the device.
Highlights
mass flow
rate in the center of the device (default).
MENU
enters the
main menu
system.
NEXT
accesses the optional
flow totalizer
(
page 11
)
.
Toggles the backlight.
Status Messages
Status messages are shown to the right of the main readout number. In the example to the
right the
OVR
message shows that the totalizer rolled over to zero.
ADC
Analog-digital converter error
LCK
Front display is locked
MOV
Mass flow over range of device
OVR
Totalizer rolled over to zero
POV
Pressure over range of device
TMF
Totalizer missed out-of-range flow
TOV
Temperature over range of device
VOV
Volumetric flow over range of device
Mounting
Flow meters do not require straight runs of pipe upstream or downstream. Most flow meter
models can be mounted in any position, including upside-down. Corrosive-resistant flow
meters use media-isolated sensors that must be tared after changing orientation.
Filters
When pressure drop is not a concern, use in-line sintered filters to prevent large particulates
from entering the flow body of the meter. Suggested maximum particulate sizes are as follows:
• 5 microns
for units with flow ranges ≤1 SCCM.
• 20 microns
for units with flow ranges between 1 SCCM and 1 SLPM.
• 50 microns
for units with flow ranges ≥1 SLPM.
The
main display
. Note the button
behind the logo, which toggles the
device backlight.
The
main display
with barometer
(PSIG) and an
OVR
status
message.
