Manufacturer: Dwyer Instruments
Brand: Dwyer
Model: 641-18
![Dwyer Series 641 Air Velocity Transmitter, 18\](http://ecx.images-amazon.com/images/I/41xEsX9ty3L._SL110_.jpg "Dwyer Series 641 Air Velocity Transmitter, 18\") |
The Dwyer series 641 air velocity transmitter combines a hot-wire anemometer that has 16 user-selectable ranges for measuring air velocity in m/s or fpm with a transmitter that provides an isolated 4 to 20 mA output signal proportional to the measured velocity. Designed as a three- or four-wire device, the transmitter has screw terminals for connecting to either an AC or DC power source and to a power or loop receiver (sold separately). Its 1/2" male NPT process connection allows direct mounting to pipe fittings or a pipe flange, and it may also be mounted using a 5/16" compression fitting. An adjustable output filter stabilizes readings when measuring turbulent flow. The unit is for use with clean, dry air and compatible, non-combustible gases. It has European Conformity (CE) marking. Models are available with various probe lengths, without or with an LED display for observing readings at the point of measurement. The 4-1/2 digit red LED has resolution of 0.01 m/s, 1 fpm (10 fpm at 10,000 and 15,000 fpm ranges). This anemometer is used for monitoring and measuring air flow in HVAC (heating, ventilation, and air conditioning) systems, exhaust stacks and hoods, and clean rooms, among other applications. SpecificationsSelectable air velocity ranges1.25, 2.5, 5, 10, 15, 25, 50, and 75 m/s; 250, 500, 1,000, 2,000, 3,000, 5,000, 10,000, and 15,000 fpmAir velocity accuracy3% of full scale with process air at 0 to 50 degrees C/32 to 122 degrees F; 4% of full scale with process air at -40 to 0 degrees C/-40 to +32 degrees F and 50 to 100 degrees C/122 to 212 degrees FProcess connection1/2" male NPTPower12 to 35VDC or 10 to 16VAC, 1.5 ampOutput signal4 to 20 mA, isolated 24V source, 3- or 4-wire connectionMaximum loop resistance600ΩPressure rating100 psi/6.89 barTemperature ratingProcess air: -40 to +100 degrees C/-40 to +212 degrees F; ambient air: 0 to 60 degrees C/32 to 140 degrees FTransmitter length113.11 mm/4-29/64"WeightWithout LED: 357.2 g/12.6 oz.; with LED: 377 g/13.3 oz. Anemometers, also called wind meters,...
