HK Instruments AVT Series Installation Instructions

INTRODUCTION
Thank you for choosing an HK Instruments AVT Series Air Velocity
Transducer. 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
separate readings for air velocity and temperature.
The AVT Series comes with three measurement ranges in a single device
(0-400, 0-2000 and 0-4000 fpm). The AVT Series is available with
optional display, a relay and NIST standard calibration certi cates.
APPLICATIONS
AVT series devices are commonly used in HVAC/R systems for:
• in-duct airflow and velocity monitoring
• in-duct temperature monitoring
• VAV applications
SPECIFICATIONS
Performance
Measurement Ranges:
Velocity: Range 2: 0 - 400 fpm
Range 10: 0 - 2,000 fpm
Range 20: 0 - 4,000 fpm
Temperature: 32 −122°F (0 − 50°C)
Accuracy:
Velocity: Range 2: 0 - 400 fpm
<20 fpm +5% from reading
Range 10: 0 - 2,000 fpm
<100 fpm +5% from reading
Range 20: 0 - 4,000 fpm
<200 fpm +5% from reading
Temperature: <33ºF for v > 100 fpm
Accuracy speci cations include: general
accuracy, temperature drift, linearity, hysteresis,
long term stability, and repetition error.
Technical Speci cations
Media Compatibility:
Dry air or non-aggressive gases
Measuring units:
pm and °F
f
Measuring element:
Temperature: ntc10k
Velocity: Pt1000
Environment:
Operating Temperature:
32 −122°F (0 − 50°C)
Storage Temperature: -4 −158°F (-20 − 70°C)
Humidity: 0 to 95% RH, non condensing
Copyright HK Instruments
AIRFLOW AND VELOCITY TRANSDUCERS
AVT Series
Physical
Case:
Dimensions: 3.54" x 3.74" x 1.4"
(90.0 x 95.0 x 36.0 mm)
Dimensions - Probe:
OD: 0.394 in (10mm)
Length: 8.26 in (210mm) from bottom of the
cover
Immersion Length with Flange:
Adjustable 2"–7.08" (50 – 180 mm)
Weight (Case + Probe): 7.76 oz (220 g)
Mounting: 2 screw holes, 11/64" (4.0mm)
Materials: Case: ABS (UL 94 V-0 Approved)
Lid: PC (UL 94 V-0 Approved)
Probe: Stainless Steel
Protection standard: IP54 / NEMA3
Display
3 1/2 Digit LCD Backlit Display
Size: 1.8" x 0.5"
(45.7 x 12.7)mm
Electrical Connections: (2 each)
Power Supply & Signal Out: 4 screw terminal
block 12-24AWG (0.2 – 1.5 mm2)
Relay Out: 3 screw terminal block
12-24AWG (0.2 – 1.5 mm
Cable Entry: (2 each)
Strain Relief: M16
Knockout : 0.625" (16mm)
WARNING
●READ THESE INSTRUCTIONS CAREFULLY BEFORE ATTEMPTING
TO INSTALL, OPERATE OR SERVICE THIS DEVICE.
●Failure to observe safety information and comply with instructions could
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 re 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
speci cations and performance characteristics are not designed or
controlled by HK Instruments, Inc. Review applications and national an
local codes to assure that the installation will be functional and safe. Use
only experienced, knowledgeable, technicians to install this device.
Electrical
Input: 24VDC/24VAC ± 10%
Current consumption 35mA (50mA with
relay) + 40mA with mA-outs
Output signal 1: (Tout)
0 - 10V (linear to temperature)
L min 1k
4 - 20mA (linear to temperature)
L max 400
Output signal 2: (vout)
0 - 10V (linear to fpm)
L min 1k
4 - 20mA (linear to fpm)
L max 400
Relay Out: 3 screw terminal block
(NC, COM, NO)
12-24AWG (0.2 – 1.5 mm
Potential free SPDT
250VAC, 6A / 30VDC, 6A adjustable switching
point and hysteresis
Conformance
Meets requirements for CE marking:
EMC Directive 2004/108/EY
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RoHS Directive 2002/95/EY
Meets safety requirements for electrical
equipment for measurement, control, and
laboratory use:
ETL marking, standard IEC61010-1.
Product is tested and meets the NRTL product-
approval requirements.
INSTALLATION
INSTRUCTIONS
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Installation Version 1.0 2012