Air Velocity Transmitter Ideal for Building Automation Systems Air V elocity

Air Velocity Transmitter Ideal for Building Automation Systems Air V elocity
p159:Layout 7
7/8/09
3:55 PM
Page 1
Series
AVU
Air Velocity Transmitter
Ideal for Building Automation Systems
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8-55/64
[225.0]
2-1/4
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9-29/64
[240.0]
The 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.
FEATURES
• 4-20 mA or 0-10 V Output Versions
• NEMA 6 (IP67) Enclosure Rating
• AC or DC Powered (Loop Version DC Only)
• 5% Accuracy
Series
641B
SPECIFICATIONS
Service: Clean air and compatible,
non-combustible gases.
Accuracy: ±5% of full scale.
Response Time (90%): 5 sec (typical).
Temperature Limits: 32 to 122°F (0 to
50°C).
Humidity Limit: 0-90% RH, non-condensing.
Power Requirements: -A models 24
VDC +10% -15%; -V models 24 VDC
or 24 VAC +10% - 15%.
Output Signal: -A models 4-20 mA
current loop; -V models 0-10 VDC.
Loop Resistance: (-A models) 700
ohms.
Current Consumption: 60 mA + output current.
Model
AVU-1-A
AVU-2-A
AVU-3-A
AVU-1-V
AVU-2-V
AVU-3-V
APPLICATIONS
• Supply and Exhaust Fan Tracking
• Clean Room Systems
• Air Pollution Studies and Manufacturing
• Process Control Systems
Air Velocity
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Range
0-785 fpm (0-4 m/s)
0-1575 fpm (0-8 m/s)
0-3150 fpm (0-16 m/s)
0-785 fpm (0-4 m/s)
0-1575 fpm (0-8 m/s)
0-3150 fpm (0-16 m/s)
Max. Start Up Current: 85 mA; 10 V.
Output Current Limit: (-V models)
>10 mA.
Electrical Connections: Screw terminal. Cable gland for 4-8 mm wire (16
gauge wire).
Enclosure Rating: NEMA 6 (IP67) except sensing point.
Probe Dimensions: 9.45 x .75˝ (240 x
19 mm).
Mounting Orientation: Unit not position sensitive. Probe must be aligned
with airflow.
Weight: 8.8 oz (250 g).
Agency Approvals: CE.
Output
4-20 mA
4-20 mA
4-20 mA
0-10 VDC
0-10 VDC
0-10 VDC
Air Velocity Transmitter
8 Field Selectable Ranges in FPM or MPS
9-1/4
[235.0]
4-31/32
[126.21]
1/2 NPT
1-23/32
[43.66]
The Series 641B Air Velocity Transmitter uses a heated mass flow sensor technology.
It has 4 user-selectable ranges from 250 FPM to 2000 FPM with corresponding metric
ranges of 1.25 MPS to 10 MPS. The 641B provides an isolated 4-20 mA output proportional
to the velocity.
The Series 641B’s steel sensor allows the unit to be used in dirty air environments. This
rugged sensor is ideally suited for quick field cleaning from a simple cloth to a pulse of air
from an air source. Proper sensor performance can be maintained in these polluted environments by easily removing dust and debris from the sensor which is problematic for pitot
tubes and other flow sensing transmitters.
Model 641B-4, Air Velocity Transmitter
ACCESSORIES
A-156, Flange Mounting Plate with 1/2˝ female NPT
A-155, Mounting Gland with 1/2˝ male NPT fitting
CALL TO ORDER:
U.S. Phone 219 879-8000
•
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 176°F (-40 to 0°C & 50 to
80°C).
Response Time: Flow: 1.5 seconds to
95% of final value (Output filter set to
minimum).
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:12–35 VDC,
10–16 VAC. 1.5A rating required on
supply due to initial power surge drawn
by transmitter.
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.
Enclosure Rating: Designed to meet
NEMA 4X.
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.
U.K. Phone (+44) (0)1494-461707
•
Asia Pacific Phone 61 2 4272-2055
159
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