Metered gases are divided into two laminar
flow paths, one through the primary flow
conduit, and the other through a capillary
sensor tube. Both flow conduits are
designed to ensure laminar flows and there-
fore the ratio of their flow rates is constant.
Two precision temperature sensing
windings on the sensor tube are heated,
and when flow takes place, gas carries heat
from the upstream to the downstream wind-
ings. The resultant temperature
differential is proportional to the change in
resistance of the sensor windings.
A Wheatstone bridge design is used to
monitor the temperature dependent resist-
ance gradient on the sensor windings
which is linearly proportional to the
instantaneous rate of flow.
| Aalborg Instruments | |
|---|---|
| Product Category | Flow Meters |
| Product Number | GFM77S-VFDL2-A0 |
| Product Name | Low Cost Mass Flowmeter |
| Meter Technology | Thermal |
| Meter Type | Mass Flow Meter; Volumetric Flow Meter |
| Features | Recorder / Totalizer Functions (optional feature) |
| Approvals | CE, ISO 9001, UKAS Quality |
| Operating Temperature | 41 to 122 F (5 to 50 C) |
