HK Instruments AVT Series User manual

Copyright HK Instruments 2014 www.hkinstruments. Installation version 2.0 2014
INSTALLATION
INSTRUCTIONS
AIR FLOW AND VELOCITY TRANSMITTERS
AVT Series
INTRODUCTION
Thank you for choosing an HK Instruments AVT series air veloc-
ity transmitter. The AVT series is intended for use in commercial
environments. It is designed with a duct mount probe and adjust-
able 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 (0–2, 0–10, 0–20 m/s). The AVT series is available with op-
tional display and relay.
APPLICATIONS
AVT series devices are commonly used in HVAC/R systems for:
• in-duct air flow and velocity monitoring
• in-duct temperature monitoring
• VAV applications
WARNING
• 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:
<0.1 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
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:
2 screw holes, 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 mm2)
Relay Out: 3-screw terminal block
12-24 AWG (0.2–1.5 mm2)
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)
12–24 AWG (0.2–1.5 mm2)
Potential free SPDT
250 VAC, 6A / 30 VDC, 6 A adjustable switching point
and hysteresis
Conformance
Meets the requirements for CE marking:
EMC Directive 2004/108/EC
RoHS Directive 2002/95/EC
LVD Directive 2006/95/EC
WEEE Directive 2002/96/EC
SPECIFICATIONS

Copyright HK Instruments 2014 www.hkinstruments. Installation version 2.0 2014
SCHEMATICS
DIMENSIONAL DRAWINGS
INSTALLATION
1) Mount the device in the desired location (see step 1).
2) Open the lid and route the cable through the strain relief and
connect the wires to the terminal block (see step 2). Use a
separate strain relief for each cable.
3) The device is now ready for configuration.
WARNING! Apply power only after the device is properly wired.
STEP 1: MOUNTING THE DEVICE
1) Select the mounting location (on a duct).
2) Use the mounting flange of the device as a template and mark
the screw holes.
3) Mount the flange on the duct with screws (not included). (Figure 1a)
4) Adjust the probe to the desired depth. Ensure that the end of the
probe reaches the middle of the duct. (Figure 1b)
5) Tighten the screw on the flange to hold the probe in position.
Figure 1a - Mounting a flange
Figure 1b - Mounting the probe in a flange
AVT
71.5
90
m/s
°C
36.0
95
210.0
15.0
15.0
70
Push button
Terminal block
Jumpers
Terminal block
for relay
Air ow direction Air ow direction
Air ow direction Air ow direction Air ow direction
Strain relief facing down
Figure 1c - Mounting orientation
Tighten the
screw

Copyright HK Instruments 2014 www.hkinstruments. Installation version 2.0 2014
Figure 2a - Wiring diagram: Tout & Vout
Figure 2b - Wiring diagram: relay output
STEP 2: WIRING DIAGRAMS
For CE compliance a properly grounded shielding cable is
required.
1) Unscrew the strain relief and route the cable(s). Use the strain
relief on the left for power in and signal out (Tout/vout) and the
strain relief on the right for relay.
2) Connect the wires as shown in figure 2a and 2b.
3) Tighten the strain relief.
CONFIGURATION
1) Select the desired measurement range (see step 3).
2) Select the desired measurement mode (see step 4).
3) Configure the relay (optional) (see step 5).
The device is now ready to be used.
STEP 3: SELECTING THE MEASUREMENT RANGE
Select the measurement range by installing jumpers as shown in
Figure 3a. (See Figure 3a-3b – Jumper settings)
STEP 4: SELECTING THE MEASUREMENT MODE
Configure 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 configured separately.
SELECTING THE MEASUREMENT RANGE CONTINUED
Tout
vout
24 V
GND
+Power supply
24 VDC / 24 VAC
V A VA
Output 0...10 V / 4...20 mA (temperature)
Output 0...10 V / 4...20 mA (velocity)
r d
No jumper
Circuit open
Jumper storedJumper installed
Cicuit closed
(Grey colour indicates that a jumper is installed)
Figure 3b - Jumper installation
J1 Jumper (J1): Installed
J2 Jumper (J2): Not installed
Range 2 (0–2 m/s)
J1 Jumper (J1): Not installed
J2 Jumper (J2): Installed
Range 10 (0–10 m/s)
J1 Jumper (J1): Installed
J2 Jumper (J2): Installed
Range 20 (0–20 m/s)
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
NC
COM
NO

Copyright HK Instruments 2014 www.hkinstruments. Installation version 2.0 2014
STEP 5: CONFIGURING THE RELAY RELAY MODE ONLY
1. Switching point (display required)
• Install a jumper to pins labeled sw.p. (switching point).
(See Figure 5)
• Press down on the pushbutton to select the switching point of the
relay. The chosen value (m/s) is shown on the display.
• Remove and store the jumper after the configuration is completed.
2. Hysteresis (display required)
• Install a jumper to pins labeled hyst. (hysteresis). (See Figure 5)
• Press down on the pushbutton to select the hysteresis of the relay
switching point. The chosen value (m/s) is shown on the display.
• Remove and store the jumper after the configuration is completed.
See the dimensional drawing above
Figure 5
WARRANTY POLICY
The seller is obligated to provide a warranty of 24 months for the de-
livered goods regarding material and manufacturing. The warranty
period is considered to start on the delivery date of the product. If
a defect in raw materials or a production flaw is found, the seller is
obligated, when the product is sent to the seller without delay or be-
fore expiration of the warranty, to amend the mistake at his/her dis-
cretion either by repairing the defective product or by delivering free
of charge to the buyer a new flawless product and sending it to the
buyer. Delivery costs for the repair under warranty will be paid by the
buyer and the return costs by the seller. The warranty does not com-
prise damages caused by accident, lightning, flood or other natural
phenomenon, normal wear and tear, improper or careless handling,
abnormal use, overloading, improper storage, incorrect care or re-
construction, or changes and installation work not done by the seller
or his/her authorized representative. The selection of materials for de-
vices prone to corrosion is the buyer’s responsibility, unless otherwise
is legally agreed upon. Should the manufacturer alter the structure of
the device, the seller is not obligated to make comparable changes to
devices already purchased. Appealing for warranty requires that the
buyer has correctly fulfilled his/her duties arisen from the delivery and
stated in the contract. The seller will give a new warranty for goods
that have been replaced or repaired within the warranty, however only
to the expiration of the original product’s warranty time. The warranty
includes the repair of a defective part or device, or if needed, a new
part or device, but not installation or exchange costs. Under no cir-
cumstance is the seller liable for damages compensation for indirect
damage.
T
v
V mA
sw.p.
hyst.
Tout
vout
24 V
GND
J1
J2
Push button