Instruction Manual

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INSTALLATION

INSTRUCTIONS

AIR FLOW AND VELOCITY TRANSMITTERS

AVT Series

Thank you for choosing an HK Instruments AVT series air velocity

transmier. 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

oponal display and relay.

• READ THESE INSTRUCTIONS CAREFULLY BEFORE ATTEMPTING

TO INSTALL, OPERATE OR SERVICE THIS DEVICE.

• Failure to observe safety informaon and comply with instrucons

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

insulaon rated for full device operang voltage.

• To avoid potenal re and/or explosion do not use in potenally

ammable or explosive atmospheres.

• Retain these instrucons for future reference.

• This product, when installed, will be part of an engineered system

whose specicaons and performance characteriscs are not

designed or controlled by HK Instruments. Review applicaons

and naonal and local codes to assure that the installaon will

be funconal and safe. Use only experienced and knowledgeable

technicians to install this device.

• Fuse at load supply (normally 6 A, 10 A, 16 A) does not always limit

the relay output load current to 6 A. Relay Maximum Load (250 V x

6 A res.)

• Add an external fuse to relay common connector. Use a me-lag

fuse (max 6 A) that is in accordance with the standard IEC 60127-2.

The product doesn’t have an internal fuse for the relay.

CAUTION: The product may only be connected to overvoltage

category II electricity network according to IEC 60664-1.

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 shi: ±0.8 % FS / °C

Units calibrated at 22 °C. Rapid thermal shi

stabilisaon me 10 min.

Temperature: <0.5 ºC typical @25ºC (velocity > 0.5 m/s)

Technical Specicaons

Media compability:

Dry air or non-aggressive gases

Measuring units:

m/s and °C

Measuring element:

Temperature: ntc10k

Velocity: Pt1000

Environment:

Operang temperature: 0...50 °C

Storage temperature: -20...70 °C

Humidity: 0 to 95 % rH, non-condensing

Physical

Dimensions:

Case : 86.0 x 95.0 x 36.0 mm

Probe: OD 10 mm, length 210 mm from boom of the

cover

Immersion Length with Flange: Adjustable 50–180 mm

Weight:

220 g

Mounng:

Mounng ange, ø 4.0 mm

Materials:

Case: ABS

Lid: PC

Probe: Stainless steel 304

Mounng ange: LLPDP

Protecon standard:

IP54

Display

3 1/2 digit LCD backlit display

Size: 45.7 x 12.7 mm

Electrical connecons:

Power supply & signal out: 4-screw terminal block

16–24 AWG (0.2–1.5 mm

)

Relay Out: 3-screw terminal block

16-24 AWG (0.2–1.5 mm

)

Cable entry:

M16

Electrical

Input: 24 VDC / 24 VAC ± 10 %

Current consumpon 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)

Potenal free SPDT

250 VAC, 6A / 30 VDC, 6 A adjustable switching point

and hysteresis

Conformance

Meets the requirements for:

CE: UKCA:

EMC: 2014/30/EU S.I. 2016/1091

RoHS: 2011/65/EU S.I. 2012/3032

LVD/EESR: 2014/35/EU S.I. 2016/1101

WEEE: 2012/19/EU S.I. 2013/3113

SPECIFICATIONS

INTRODUCTION

AVT series devices are commonly used in HVAC/R systems for:

• in-duct air ow and velocity monitoring

• in-duct temperature monitoring

• VAV applicaons

APPLICATIONS

WARNING

RoHS

COMPLIANT

Summary of content (4 pages)

PAGE 1
INSTALLATION INSTRUCTIONS AIR FLOW AND VELOCITY TRANSMITTERS AVT Series INTRODUCTION WARNING Thank you for choosing an HK Instruments AVT series air velocity transmitter. The AVT series is intended for use in commercial environments. 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.
PAGE 2
SCHEMATICS 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. Push button WARNING! Apply power only after the device is properly wired. Terminal block Terminal block for relay STEP 1: MOUNTING THE DEVICE 1) Select the mounting location (on a duct).
PAGE 3
MOUNTING THE DEVICE COntinued STEP 3: SELECTING THE MEASUREMENT RANGE Select the measurement range by installing jumpers as shown in Figure 3a.
PAGE 4
STEP 5: CONFIGURING THE RELAY RELAY MODEL ONLY Hysteresis CONTINUED 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 (e.g. 5,05 m/s = NC) 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).