Functional principle
• vortex meter for flow rate
and volume measurement
• ultrasonic recording of the
vortex shedding
Messmedium
• Primarily single-phase gas
mixtures with air, nitrogen,
oxygen, methane, natural
gas, torch gas, ammonia,
argon, carbon monoxide,
water vapour ... as
dominant components,
combustion process of waste
gases, biogas, sewer gas.
Other gases on request.
Advantages
• compact measuring
instrument with on-site
display in Ex-application
• application in Category 1
(Zone 0 and 20), transducer
housing approved for
Category 2 (Zone 1 and 21)
• no external isolation/supply
unit necessary
• records even the slightest
flow rates, due to patented
ultrasonic sensing
• high measuring dynamics
(up to 1 : 100)
• no moving parts
• easy to clean
• high fatigue strength
• corrosion resistant
• operates to a large extent
irrespective of gas
composition
• low pressure drop
• easy configuration via
HART interface
Particles, humidity 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
Measurable variables
• actual flow rate
• actual velocity
• standard volume flow (in
combination with pressure
and temperature
sensors)
Design
• measuring tube with flanged
connection
1/6
Vortex Flow Sensor VA Di Ex-d
http://U350_VADi Exd_DoP_e_100613 www.hoentzsch.com
Vortex Flow Sensor VA Di Ex-d for flow measurement in gases;
with integrated, configurable transducer UVA in Ex-d housing
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
Drawing 1
