Vortex Flow Sensor VAR Twin type - U3320 pages

Vortex flow sensor VAR TwinPipe
with ±directional sensing of flow

Vortex flow sensor VAR TwinPipe with ±directional sensing of flow
for measuring flow velocity in traffic tunnels, mining galleries and waste disposal sites

Drawing 2

Measurable variable
• standard flow velocity v [m/s]

Medium
• air, exhaust air ...

Measuring range
±0.4 ... ±25 m/s

Design
• vortex twin flow sensor

Advantages
• cost-efficient
• robust, maintenance-free and
nonwearing, as no moving parts
• high fatigue strength and longterm stability
• reliable, even in extreme
conditions
• unlike other measuring systems
no on site calibration necessary
• only one installation point for
the entire measuring system
necessary
• application in Ex-protection
Category 3G and 3D (zone 2
and zone 22) permissible

U332_VAR_DoP_e_120413

http://www.hoentzsch.com

Functional principle
• vortex meter for measuring
flow velocity
• ultrasonic measurement of
the vortex shedding

Range and examples of
application
• measurement of flow in traffic
tunnels, mines and waste disposal
sites
• control of air ventilation

Particles, humidity and
condensation
• charges in the gas caused by
particles such as soot do not
affect measurements, as long as
geometric-changing
agglomerations do not occur on
the sensor
• relative humidity of less than
100 % does not affect the
measurement uncertainty

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