Listing ID #5358702
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Contact Suppliermodel 641b air velocity transmitter
dirty air flow applications
a low-cost, direct reading instrument used for both air velocity & static pressure teststhe model 641b air velocity transmitter uses a heated mass flow sensor suitable for dirty air flow applications. It has user-selectable ranges from 250 fpm (1.25 mps) to 2000 fpm (10 mps).
product applications
exhaust stack flow monitoring
air control in drying processes
hvac air velocity measurements
fan supply and exhaust tracking
clean room ventilation monitoring
model description
641b-4air velocity transmitter.
641b-4-ledair velocity transmitter with led display.
specifications
service:air and compatible, non-combustible gases.
accuracy:5% fs process gas: 32 to 122°f (0 to 50°c); 6% fs process gas: -40 to 32°f & 122 to 212°f (-40 to 0°c & 50 to 100°c).
response time:flow: 1.5 s to 95% of final value (output filter set to min).
temperature limits:process: -40 to 176°f (-40 to 80°c). Ambient: 32 to 140°f (0 to 60°c).
humidity limit:non-condensing.
power requirements:12 to 35 vdc, 10 to 16 vac. 1.5 a rating required on supply due to initial power surge drawn by transmitter.
output signal:4 to 20 ma, isolated 24 v source, 3 or 4-wire connection.
output filter:selectable 0.5-15 s.
loop resistance:600 ω max.
current consumption:300 ma max*.
electrical connections:screw terminal.
enclosure rating:designed to meet nema 4x (ip66) for non-led models only.
mounting orientation:unit not position sensitive.
weight:12.6 oz (357.2 g).
*a brief current transient exceeding 300 ma may be seen on startup.
features
ss sensor suitable for dirty air flow measurement
ranges from 250 fpm (1.25 mps) to 2000 fpm (10 mps)
4 to 20 ma output
digital filter for signal damping
accessories
model numberdescription
a-155cable gland with 1/2" male npt fitting.
a-156flange mounting plate with 1/2" female npt.
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technical reference books
technical reference books
feature : excellent performance, fine finished, high quality
material : aluminum, plastic
warranty : 1yrs
output : 3 or 4-wire connection.
voltage : 10 to 16 vac. 1.5 a rating required on supply due to initial power surge drawn by tran
power : non-combustible gases.
type : air velocity transducer, model 641b air velocity transmitter
weight : 12.6 oz (357.2 g).
usage : non-combustible gases.
condition : new