Datasheet Posifa Technologies PLF2135 — Datenblatt

PLF2000 Series
LIQUID FLOW SENSOR FOR WATER METERING
131 E. Brokaw Road | San Jose CA 95112 | +1 (408) 392-0989 | info@posifatech.com | www.posifatech.com DESCRIPTION
Posifa designed the PLF2000 series of liquid flow
sensors to replace mechanical turbine flow sensors.
With a MEMS thermal flow die at its core, PLF2000
is far more accurate and repeatable, even when
flow is pulsatile and provides a linear digital output.
Because it has no moving parts, PLF2000 does not
get stuck nor suffer mechanical breakdown. Cleaning
does not require disassembly. Also, because it does
not introduce an obstruction (i.e. turbine) in the flow
path, it presents minimal flow resistance, making it
possible to circulate liquid via gravity, a boiler, or a
low-power pump. APPLICATIONS PLF2000 features Posifa’s third-generation thermal
flow die, benefiting from the latest innovations
in microfabrication. The sensor die uses a pair of
thermopiles to detect changes in temperature
gradient caused by mass flow, delivering excellent
signal-to-noise, and repeatability. The “solid state”
thermal isolation structure eliminates the need
for the surface cavity or fragile membrane used in
competing technologies. The sensor die, with its …