Air Flow Velocity

We offer superior quality vane thermo anemometer that are subjected to several calibration tests so as ensure their effectiveness and reliable readings. These are available with the following specifications:

Specifications :

• Air velocity ranges: 0. 3 to 45 m/s; 0. 7 to 100 mph; 0. 6 to 88. 0 knots; 1 to 140. 0 km/hr; 60 to 8,800 ft/min.
• Temperature range: 32 to 122°f (0 to 50°c).
• Air volume ranges: cfm (ft3/min) or cmm (m3/min).
• Accuracy: air velocity: ±3% of reading ± 0. 1, whichever is greater
• Temperature: ±1. 5 °f (±0. 8°c).
• Resolution: 0. 1 knots, m/s, km/hr, and mph; 0. 1/1 ft/min; 0. 1°c.
• Temperature sensor: type k thermocouple.
• Temperature limits: 32 to 140°f (0 to 60°c).
• Display: dual line, 4-digit, 1. 1? ? (27. 9 mm) height.
• Power: 9v alkaline battery (included). Battery life: approx. 50 hours.
• Output: rs232 serial interface via db9 female connector.
• Housing: abs plastic, 1? ? (25 mm) diameter.
• Weight: 12. 3 oz (350 g).

We offer precision engineered range of air velocity transmitter that are known for their reliable readings and effectiveness.

Specifications:

Service: Clean air and compatible, non-combustible gases.

Accuracy:

3% FS Process gas: 32 to 122T (0 to 50°C).
4% FS Process gas: -40 to 32°F & 122 to 
212°F(-40toO°C&50to100°C)

• Response Time: Flow: 1.5 seconds to 95% of final value (Output filter set to minimum).
• Temperature Limits: Process: -40 to 212T (-40 to 100°C).
• Ambient: 32 to 140°F (0 to 60°C).
• Pressure Limit: 100 psi (6.89 bar) maximum.
• Humidity Limit: Non-Condensing.
• Power Requirements: 12-35 VDC, 10-16 VAC.
• Output Signal: 4-20 mA, isolated 24V source, 3 or 4-wire connection.
• Output Filter: Selectable 0.5 -15 (seconds).
• Loop Resistance: 600 ohms max.
• Current Consumption: 300 mA max.
• Electrical Connections: Screw terminal.
• Process Connections: 1/2 male NPT.
• Enclosure Rating: Designed to meet NEMA 4X (IP66) for non LED models only.
• Mounting Orientation: Unit not position sensitive. Probe must be aligned with airflow.
• Weight: 12.6 oz (357.2 g).
• Agency Approval: CE.

Optional Display Version :

Display: 4-1/2 digit 1/2" red LED.

Resolution: 1 FPM, 0.01 MPS

The duct mounted airflow measurement station is easy to install -- simply connect the tubing to the station fittings, then to a differential pressure manometer, gage, transmitter or switch. Single or multiple airflow elements are factory mounted and pre-piped in a casing designed for flanged connection to the duct work. Standard materials consist of a galvanized casing and anodized aluminum flow sensors, suitable for most hvac applications.

It utilizes an airflow averaging element in a head-type device, generating a differential (velocity) pressure signal similar to the orifice, venturi, and other had producing primary elements. Strategically located sensing ports continually sample the total and static pressures when inserted normal to flow.

Total pressure sensed by the upstream ports are continually averaged within the airflow element in an isolated chamber. The static sensing ports are averaged in a second isolation chamber. Multiple elements are joined together for connection to a differential measurement device (gage, transmitter, etc. ) for flow measurement and indication purposes.

The model 530 air flow switch provides excellent sensitivity and reliability at a very reasonable price. Quality features include a rugged die cast body, stainless steel vane and spdt snap switch. Unit is field adjustable from 400-1600 fpm. Mounting is fast and simple, with only two screws needed. Vane fits 6" or larger ducts.

The new series AVFS adjustable air flow switch complements the dwyer instruments line of thermo-anemometer transmitters and handheld instruments. The avfs is specifically designed to monitor air flow in ducts and provides a 3a contact output to indicate a change or loss of flow. Simply turn on the fan or air handling unit and adjust the set-point via the potentiometer to show normal status. Then alter a damper or decrease fan speed to activate the avfs. The avfs will signal a loss of flow and the n. O. Spst output will indicate the detected decrease. For ease of installation and system troubleshooting, the series avfs possesses a red/green led indication to provide local status if the air flow is above (green) or below (red) the set-point. The avfs provides a ±5% set-point repeatability across a full scale range of 1-10 m/s (197-1969 fpm) and includes a mounting bracket for quick duct mounting. The avfs series adjustable air flow switches come in a compact, rugged pbt enclosure that is rated nema 4x (ip65), making them ideal for any ventilation system installation or similar bas application.

Series 160s pitot tubes are designed specifically for flow measurement of dirty, particulate laden air or gas streams typical in smoke stack and other environmental testing. Large 5/16" dia. Stainless steel tubing resists plugging under harsh, sooty conditions which quickly block conventional flow sensors. Total and static pressure tubes are precisely aligned and welded together every six inches for maximum accuracy, strength and long term durability. Versatile 1/8" female npt connections easily adapt to any type of pipe or tubing. A pair of 1/8" npt to 3/16" i. D. Tubing adapters is included plus a handy molded vinyl cap to protect tip when not in use. Supplied with complete instructions.

Permanent mounting (pm) models include 1 inch dia. Welded stainless steel sleeve and adjustable compression fitting with 1 inch male npt mounting treads. Adjust depth, lock in place.

Series 160e pitot tubes are widely used in the u. K. And europe for applications demanding high accuracy when measuring the flow of air or other compatible gases. Precision crafted tip configuration allows air to pass smoothly with minimum turbulence for consistent, reliable readings. Exterior indicator arm is aligned parallel to the 5 in. (13 cm) sensing tip so you always know that unit is properly positioned inside duct. Sliding depth indicators grip firmly to ensure uniform insertion - critical when making multiple measurements as part of a complete traverse; the best way to determine average velocity. Total and static pressure taps are 1/4" (6 mm), permanently silver soldered to the connection block, leak-proof and durable. Seven fixed length sizes are offered plus a universal model which attaches to any length of 3/4" sch. 40 pipe.

Ideal for use with our precision manometers and air velocity gauges, dwyer® pitot tubes are constructed from corrosion resistant stainless steel for a lifetime of service. Asme design meets amca and ashrae specifications for maximum accuracy over a wide variety of flow conditions. No correction factors required as ashrae tip design yields a calibration factor of 1. Ashrae design needs no calibration! Permanent, stamped insertion depth graduations on sides of 160 series facilitate accurate positioning. Static pressure port is parallel to sensing tube allowing quick, easy alignment of tube with air flow. Low sensitivity to misalignment gives accurate reading even when tube is misaligned up to 15 degrees. Various standard sizes are available for use in ducts as small as 4" dia. Or as large as 36 ft. Dia. A universal model fits user supplied 3/4" schedule 40 (standard) pipe in any length. Several convenient mounting options are available for permanent installations.

The model 166t telescoping pitot tube is a unique air flow sensor which can quickly and easily be adjusted for any duct insertion length from 11. 5 to 36 inches (29. 2 to 91. 4 cm). Now, this single compact unit can replace up to five conventional fixed length pitot tubes. For even greater convenience, it is securely protected by a custom fitted polyethylene carrying case. Telescoping sections lock in place as they are extended, enabling use of the handle grip to gauge proper alignment of the tip within the airstream. Stainless steel construction resists corrosion. Hemispherical tip has 1. 0 flow coefficient, is 1/8" dia. (3. 2 mm). Largest section is 3/8" (9. 5 mm). Weight (with case) 1 lb, 9 oz (709 g). Case: 12. 5 x 6. 25 x 1. 75 in.

The dwyer series avu air velocity transmitter is ideal for a wide range of hvac measurement and control applications, particularly in complete building control and energy management systems. The series avu offers 5% accuracy at a surprisingly low cost, with six units covering ranges from 0-785 fpm to 0-3150 fpm, with either 4-20 ma or 0-10 vdc output.

the series avu transmitter operates by measuring the heat loss from one of the two sensing elements in the air-stream, then calculating the air velocity. Units are virtually immune to drift due to the design of the sensing element, which makes the transmitter accurate over the whole air velocity range.

The series vtt hot-wire air velocity and temperature transmitter provides a versatile unit for air velocity and temperature needs. The vtt offers five field-selectable ranges as well as operating in metric (m/s, °c) or english (fpm, °f) units. The vtt can measure up to 30 m/s (6000 fpm) and 50°c (122°f). The units are available with or without an lcd display which alternates between velocity and temperature. Series vtt can be ordered in duct mount or remote mount configurations with 4-20 ma or 0-10 v outputs. The vtt is a useful transmitter for many common hvac applications.

Excellent for measuring air flow and air velocity with available duct size. Provides 0 - 10 v output to hook up with VFD for controlling the flow.