HK Instruments AVT Series User manual
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 certicates.
APPLICATIONS
AVT series devices are commonly used in HVAC/R systems for:
• in-duct airflow and velocity monitoring
• in-duct temperature monitoring
• VAV applications
Copyright HK Instruments Installation Version 1.0 2012
AIRFLOW AND VELOCITY TRANSDUCERS
AVT Series
INTRODUCTION WARNING
INSTALLATION
INSTRUCTIONS
●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
specications 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.
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 specications include: general
accuracy, temperature drift, linearity, hysteresis,
long term stability, and repetition error.
Technical Specications
Media Compatibility:
Dry air or non-aggressive gases
Measuring units:
fpm and °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
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 mm2)
Cable Entry: (2 each)
Strain Relief: M16
Knockout : 0.625” (16mm)
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 1kΩ
4 - 20mA (linear to temperature)
L max 400Ω
Output signal 2: (vout)
0 - 10V (linear to fpm)
L min 1kΩ
4 - 20mA (linear to fpm)
L max 400Ω
Relay Out: 3 screw terminal block
(NC, COM, NO)
12-24AWG (0.2 – 1.5 mm2)
Potential free SPDT
250VAC, 6A / 30VDC, 6A adjustable switching
point and hysteresis
Conformance
Meets requirements for CE marking:
EMC Directive 2004/108/EY
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.
Copyright HK Instruments Installation Version 1.0 2012
SCHEMATICS
MOUNTING THE DEVICE
INSTALLATION
STEP 1
1) Select mounting location (in a duct)
2) Use the mounting ange of the device as a template and mark the
screw holes
3) Mount the ange on the duct with screws (not included) (Figure 1a)
4) Adjust the probe to desired depth. Ensuring the end of the probe
reaches the middle of the duct. (Figure 1b)
5) Tighten the screw on the ange, to hold the probe in position.
1) Mount the device in desired location (see step 1)
2) Open the lid and route cable through strain relief and connect the
wires to terminal block (see step 2). Use separate strain relief for
each cable.
3) The device is now ready for conguration
WARNING! Apply power after the device is properly wired.
Figure 1a - Mounting A Flange
DIMENSIONAL DRAWINGS
Push Button
Terminal Block
Jumpers
Terminal Block
for Relay
AVT
3.54
(90.0)
2.815
(71.5)
1.41
(36.0)
3.74
(95.0)
0.59
(15.0)
0.59
(15.0)
2.756
(70.0)
8.267
(210.0)
Figure 1b - Mounting The Probe In A Flange
Tighten Screw
Figure 1c - Mounting Orientation
Air Flow Direction Air Flow Direction
Air Flow Direction Air Flow Direction Air Flow Direction
Strain Relief Facing Down
Copyright HK Instruments Installation Version 1.0 2012
CONFIGURATION
1) Select the desired measurement range (see step 3
2) Select the desired measurement mode (see step 4)
3) Congure the relay (optional) (see step 5)
The device is now ready to use.
SEL. THE MEASUREMENT RANGE
Congure the outputs:
• Temperature output (Tout)
• Velocity output (vout)
Select the output mode, Current (mA) or Voltage (V), by installing
jumpers as shown in Figure 4. Both outputs, Temperature (T)
and Velocity (v), are congured separately.
FIGURE 3
For CE compliance, a properly grounded shielding cable is
required.
1) Unscrew strain relief and route cable(s). Use the strain relief on
left for power in and signal out (Tout/vout) and the strain relief on
right for relay.
2) Connect the wires as shown in gure 2a and 2b.
3) Tighten the strain relief.
WIRING DIAGRAMS STEP 2
Tout
vout
24V
GND
+Power Supply
24VDC / 24VAC
NC
COM
NO
Figure 2a - Wiring Diagram: Tout & Vout
Figure 2b - Wiring Diagram Relay Output
V A VA
Output 0...10V / 4...20mA (temperature)
Output 0...10V / 4...20mA (velocity)
SEL. THE MEASUREMENT RANGE
Select the measurement range by installing jumpers as shown in
Figure Z. (See Figure 3a-3b – Jumper settings)
Figure 3a
Figure 4
V
Temperature Output (Tout): T=Voltage (V)
Velocity Output (vout): v=Voltage (V)
T
v
mA
V
Temperature Output (Tout): T=Current (mA)
Velocity Output (vout): v=Current (mA)
T
v
mA
Temperature Output (Tout): T=Voltage (V)
Velocity Output (vout): v=Current (mA)
T
v
V mA
Temperature Output (Tout): T=Current (mA)
Velocity Output (vout): v=Voltage (V)
T
v
V mA
STEP 3
J1 Jumper (J1): Installed
J2 Jumper (J2): Not Installed
Range 2 (0-400 fpm)
J1 Jumper (J1): Not Installed
J2 Jumper (J2): Installed
Range 10 (0-2000 fpm)
J1 Jumper (J1): Installed
J2 Jumper (J2): Installed
Range 20 (0-4000 fpm)
CONTINUED
SEL. THE MEASUREMENT MODE STEP 4
Figure 3b - Jumper Installation
No Jumper
Circuit Open
Jumper StoredJumper Installed
Cicuit Closed
(Grey color indicates that a jumper is installed)
Copyright HK Instruments Installation Version 1.0 2012
1. Switching point (display required)
• Install jumper to pins labeled sw.p. (switching point).
(See Figure 5)
• Press down on the pushbutton (joystick) to select the switching
point of the relay. The chosen value (fpm) is shown on the display.
• Remove and store the jumper after the conguration is
completed.
2. Hysteresis (display required)
• Install jumper to pins labeled hyst. (hysteresis).
(See Figure 5)
• Press down on the pushbutton (joystick) to select the hysteresis of
the relay switching point. The chosen value (fpm) is shown on the
display.
• Remove and store the jumper after the conguration is
completed.
FIGURE 3CONFIGURING THE RELAY RELAY MODE ONLY STEP 4
Figure 5
T
v
V mA
sw.p.
hyst.
Tout
vout
24V
GND
J1
J2
Push Button
See Dimensional Drawing Above
FIGURE 3WARRANTY POLICY
(a) WARRANTY COVERAGE: HK warrants to the original end user
of the Products that the Products will, at the date of initial
purchase, meet the applicable specication for such Products (as
described by HK in its product literature) and, under normal use
and service, will be free from any defects in materials or manufac-
ture for (a) one (1) year from date of sale to end user for electrome-
chanical Products and (b) ve (5) years from date of manufacture
for electronic Products.
(b) NO WARRANTY OF PRODUCT SUITABILITY: Neither HK nor
the manufacturer of the Products to be sold hereunder
(“Manufacturer”) makes any warranty that Products are suitable for
a particular purpose, application or design. Many states and
localities have differing codes or regulations governing the installa-
tion and/or use of HK products. HK does not guarantee compli-
ance with such codes or regulations; the end user is solely
responsible for safe and correct installation and use of the Prod-
ucts and for compliance with such codes and regulations.
(c) EXCLUSION OF IMPLIED WARRANTIES: THE WARRANTY
HEREIN IS THE ONLY WARRANTY APPLICABLE TO THE PROD-
UCTS AND EXCLUDES ALL OTHER WARRANTIES, INCLUDING
ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE, AND ANY IMPLIED WARRANTY ARIS-
ING FROM COURSE OF DEALING OR USAGE OF TRADE.
(d) REMEDIES FOR NON-CONFORMITY OR BREACH OF WAR-
RANTY: If the Product purchased does not conform to the appli-
cable warranty, HK will provide, at its option, one of the following
remedies: (1) repair of the non-conforming Product, (2) replace-
ment with a conforming Product, or (3) refund of the original
purchase price. THESE REMEDIES SHALL BE THE EXCLUSIVE
AND SOLE REMEDY for any breach of warranty. HK and Manufac-
turer have no other responsibility or liability for breach of warranty
or otherwise.
(e) LIMITATION OF LIABILITY: NEITHER HK NOR MANUFAC-
TURER WILL BE LIABLE FOR ANY INCIDENTAL, SPECIAL,
INDIRECT, OR CONSEQUENTIAL DAMAGES UNDER ANY
CIRCUMSTANCE, INCLUDING WITHOUT LIMITATION ANY
DEFECT IN THE PRODUCT PURCHASED.
(f) FURTHER LIMITATIONS: The warranty herein does not cover
damage caused by lightning, ood or other natural phenomenon;
normal wear and tear; accident, improper or careless handling,
abnormal use, overloading, improper storage or abuse; incorrect
installation, care or reconstruction; or alteration, calibration,
reconguration, maintenance or installation work done by unquali-
ed personnel. Should Manufacturer alter the structure of any
Product in the future, HK and Manufacturer shall not be obligated
to make comparable changes to Products already purchased. HK
will give a new warranty for Products being replaced or repaired
within the warranty period, however only to the expiration of the
original Product’s warranty period. The warranty includes the repair
of a defective part or device, or if needed, a new part or device,
but no other costs except as otherwise stated in the HK Distributor
Terms and Conditions.
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