Installation version 6.0 2018
INSTALLATION
INSTRUCTIONS
AIR FLOW AND VELOCITY TRANSMITTERS
AVT Series
Thank you for choosing an HK Instruments AVT series air velocity
transmitter. The AVT series is intended for use in commercial environ
-
ments. It is designed with a duct mount probe and adjustable collar
suitable for round or rectangular ducts. The AVT series provides sepa
-
rate readings for air velocity and temperature.
The AVT series comes with three measurement ranges in a single de
-
vice (0–2 m/s, 0–10 m/s, 0–20 m/s). The AVT series is available with
optional display and relay.
• READ THESE INSTRUCTIONS CAREFULLY BEFORE
ATTEMPTING TO INSTALL, OPERATE OR SERVICE THIS
DEVICE.
• Failure to observe safety information and comply with
instructions can result in PERSONAL INJURY, DEATH AND/OR
PROPERTY DAMAGE.
• To avoid electrical shock or damage to equipment, disconnect
power before installing or servicing and use only wiring with
insulation rated for full device operating voltage.
• To avoid potential fire and/or explosion do not use in potentially
flammable or explosive atmospheres.
• Retain these instructions for future reference.
• This product, when installed, will be part of an engineered
system whose specifications and performance characteristics
are not designed or controlled by HK Instruments. Review
applications and national and local codes to assure that the
installation will be functional and safe. Use only experienced and
knowledgeable technicians to install this device.
Performance
Measurement ranges:
Velocity:
Range: 0–2 m/s
Range: 0–10 m/s
Range: 0–20 m/s
Temperature: 0−50 °C
Accuracy:
Velocity:
Range: 0...2 m/s: <0.2 m/s + 5 % from reading
Range: 0...10 m/s: <0.5 m/s + 5 % from reading
Range: 0...20 m/s: <1.0 m/s + 5 % from reading
Thermal shift: ±0.8 % FS / °C
Units calibrated at 22 °C. Rapid thermal shift
stabilisation time 10 min.
Temperature: <0.5 ºC (velocity > 0.5 m/s)
Technical Specifications
Media compatibility:
Dry air or non-aggressive gases
Measuring units:
m/s and °C
Measuring element:
Temperature: ntc10k
Velocity: Pt1000
Environment:
Operating temperature: 0...50 °C
Storage temperature: -20...70 °C
Humidity: 0 to 95 % rH, non-condensing
Physical
Dimensions:
Case : 90.0 x 95.0 x 36.0 mm
Probe: OD 10 mm, length 210 mm from bottom of the
cover
Immersion Length with Flange: Adjustable 50–180 mm
Weight:
220 g
Mounting:
Mounting flange, ø 4.0 mm
Materials:
Case: ABS
Lid: PC
Probe: Stainless steel 304
Mounting flange: LLPDP
Protection standard:
IP54
Display
3 1/2 digit LCD backlit display
Size: 45.7 x 12.7 mm
Electrical connections:
Power supply & signal out: 4-screw terminal block
12–24 AWG (0.2–1.5 mm
2
)
Relay Out: 3-screw terminal block
12-24 AWG (0.2–1.5 mm
2
)
Cable entry:
M16
Electrical
Input: 24 VDC / 24 VAC ± 10 %
Current consumption 35 mA (50 mA with relay)
+ 40 mA with mA-outs
Output signal 1: (T out)
0–10 V (linear to temperature)
L min 1 kΩ
4–20 mA (linear to temperature)
L max 400 Ω
Output signal 2: (v out)
0–10 V (linear to m/s)
L min 1 kΩ
4–20 mA (linear to m/s)
L max 400 Ω
Relay Out: 3-screw terminal block
(NC, COM, NO)
Potential free SPDT
250 VAC, 6A / 30 VDC, 6 A adjustable switching point
and hysteresis
Conformance
Meets the requirements for CE marking:
EMC Directive 2014/30/EU
RoHS Directive 2011/65/EU
LVD Directive 2014/35/EU
WEEE Directive 2012/19/EU
SPECIFICATIONS
INTRODUCTION
AVT series devices are commonly used in HVAC/R systems for:
• in-duct air flow and velocity monitoring
• in-duct temperature monitoring
• VAV applications
APPLICATIONS
WARNING
RoHS 2
2011/65/EU
