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Vortex Flow Sensor VA40 ZG8 Ex-d
U346_VAZG8Exd_DoP_e_081020 http://www.hoentzsch.com
Vortex probe VA for flow measurement of gases with integrated,
configurable transducer UVA in Ex-d housing
Functional principle
• vortex meter for measuring
flow velocity, flow rate and
volume
• ultrasonic measuring of the
vortex shedding
Advantages
• compact measuring instrument
with optional on-site display in
Ex-application
• application in category 1 (zones
0 and 20), transducer housing
approved for category 2 (zones
1 and 21)
• no external isolation/supply unit
necessary
• minimal reaction time (0.5 m/s)
• high measuring dynamics (1:80)
• steady long-term measuring
• no moving parts
• easy to clean
• high fatigue strength
• corrosion resistant
• operates to a large extent
irrespective of gas composition
• minor pressure drop
• easy configuration via HART.-
interface
Medium
• primarily single-phase gas
mixtures with air, nitrogen,
oxygen, methane, natural gas,
ammonia, argon, carbon
monoxide, superheated steam ...
as dominant components,
biogas.
Other gases or gas mixtures on
request.
Measuring range
• 0.5 ... 40 m/s
Measurable variables
• actual flow velocity v [m/s]
• actual flow rate [m3/h] in
• conversion to standard
velocity/standard volume flow
by entering working pressure
and temperature parameters
Drawing 8
Design
• insertion probe with probe guide
piece and Ex-d housing
Particles, humidty and
condensation
• charges in the gas caused by
particles such as dust and
fibres do not affect
measurement, as long as
abrasion and agglomeration do
not occur on the
sensor
• relative gas humidity of less
than 100 % and slight
condensation on the
sensor do
not affect the measurement
uncertainty
Kármán vortex street
Examples of application
• flow measurement in Exapplication,
for example, of air,
outgoing air, sludge activation air,
engine intake air, natural gas,
exhaust gas, process gas, biogas,
motor car exhaust, torch gas,
water vapour
Probe, as an example, with screw
thread probe guide piece SFB
Probe VA40 ZG8 as an example with flange guide piece SFB
probe guide
piece SF
