DEGREE CONTROLS B-Series Manuale utente

B-Series Air Velocity Sensors USER GUIDE 67500MN00-A01

B-Series Air Velocity Sensors USER GUIDE 67500MN00-A01 1

B-Series Air Velocity Sensors

User Guide

DEGREE CONTROLS, INCORPORATED

18 Meadowbrook Drive

Milford, New Hampshire 03055 USA

Information in this document is subject to change without notice.

Windows® is a registered trademark of Microsoft Corporation • All other trademarks are property of their respective owners.

B-Series Air Velocity Sensors USER GUIDE 67500MN00-A01

B-Series Air Velocity Sensors USER GUIDE 67500MN00-A01 2

Table of Contents

1General Information ................................................................................................................................................................................................ 3

1.1 Overview ...................................................................................................................................................................................................................3

1.2 Features.....................................................................................................................................................................................................................3

1.2.2 Electrical & Performance Features..................................................................................................................................................................3

1.2.1 Mechanical Features .......................................................................................................................................................................................3

2Product Specifications..............................................................................................................................................................................................4

2.1 General Specifications ...............................................................................................................................................................................................4

2.2 Model Specifications .................................................................................................................................................................................................5

2.3 Hardware Configuration............................................................................................................................................................................................5

3Wiring Information ..................................................................................................................................................................................................6

3.1 Configured with Analog Output and UART Digital Communication...........................................................................................................................6

3.2 Configured Only with UART Output ..........................................................................................................................................................................6

3.3 Configured Only with I2C Output...............................................................................................................................................................................6

4Mechanical Information...........................................................................................................................................................................................7

4.1 Probe Sensor Head Mechanical Drawings .................................................................................................................................................................7

4.2 °C Clamp Mechanical Drawing...................................................................................................................................................................................7

5Mounting and Positioning ........................................................................................................................................................................................ 8

5.1 Probe Style Sensors: B300/B500 ...............................................................................................................................................................................8

5.1.1 Gland Installation ............................................................................................................................................................................................8

5.1.2 °C Clamp Installation.......................................................................................................................................................................................9

5.1.3 Airflow Direction ...........................................................................................................................................................................................10

6Communication...................................................................................................................................................................................................... 10

6.1 UART........................................................................................................................................................................................................................10

6.1.1 Hardware.......................................................................................................................................................................................................11

6.1.2 Configuration ................................................................................................................................................................................................11

6.2 I2C............................................................................................................................................................................................................................12

6.2.1 Configuration ................................................................................................................................................................................................12

6.3 Velocity Analog Output (Voltage)............................................................................................................................................................................13

6.3.1 Velocity Analog Output (Voltage) Example ...................................................................................................................................................15

6.4 Velocity Analog Output (Current)............................................................................................................................................................................16

6.4.1 0-20 mA.........................................................................................................................................................................................................16

6.4.2 4-20 mA.........................................................................................................................................................................................................16

6.4.3 Velocity Analog Output (Current) Example ...................................................................................................................................................17

6.5 Temperature Analog Output ...................................................................................................................................................................................17

6.5.1 Temperature Analog Example.......................................................................................................................................................................18

7Sensor Registers..................................................................................................................................................................................................... 19

7.1 Memory Map...........................................................................................................................................................................................................19

8Degree Controls Inc. Product Warranty .................................................................................................................................................................. 23

B-Series Air Velocity Sensors USER GUIDE 67500MN00-A01

B-Series Air Velocity Sensors USER GUIDE 67500MN00-A01 3

1 General Information

1.1 Overview

Thank you for your purchase of a DegreeC B-Series Sensor,

a versatile and rugged, high-performance air velocity sensor

that measures real-time air velocity and directionality values in

both analog and digital communication outputs.

Designed with conformal coated electronics and sealed enclosures, our Sensor Products are suitable for demanding

applications, including those in corrosive or alkaline environments. With their robust, splash proof design and UV

tolerant construction, the B-Series sensors are designed to handle a wide range of product and process control air flow

applications. Additionally, the B-Series is configured to order, with a variety of velocity ranges, mechanical lengths, and

output communication styles available.

1.2 Features

1.2.1 Mechanical Features

• Two available mounting styles: Standard clamp

or special gland fitting used for mounting sensor

assembly, without need for screws, or hands

inside the duct.

• Optimized flow geometry with segregation of

velocity and temperature elements for highest

accuracy.

• Aerodynamic cross section to minimize flow

disturbance.

• Robust, sealed probe assembly uses corrosion

and UV resistant materials.

• Printed insertion depth markers and flow

direction arrow.

• Conformal coated sensing elements for

environmental protection.

• Plenum-rated cabling suitable for HVAC,

laboratory and process control applications.

• Remote head models available for compact

applications or design-in embedded sensing

needs.

• RoHS compliant

• Certified European (CE)

1.2.2 Electrical & Performance Features

• Industry-leading air velocity performance, with

repeatability within ±1%.

• Quick Average velocity reading for fastest

control system response.

• Wide voltage input options 4.5 –15VDC or

24VAC/DC.

• Multiple digital outputs available.

• Multi-sensor addressing capability.

• Intelligent, built-in customizable

averaging/smoothing functions.

• <10 second start-up time and 400ms response

time.

• May be configured as an airflow switch with

open drain output.

• Both air velocity and temperature analog

outputs may be configured as voltage or

current.

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2 Product Specifications

2.1 General Specifications

Operating Temperature

0°C to 60°C (32°F to 140°F)

Storage Temperature

-40°C to 105°C (-40°F - 221°F)

Air Velocity Range

-20m/s to +20m/s (-4000 fpm to +4000 fpm)

Relative Humidity

5 –95%

Repeatability

± 1% of reading (under identical conditions)

Temperature Accuracy

± 1°C*

Response Time

400ms

Airflow Averaging Time

Configurable (3 second default)

Start-up Time

<10 s

Velocity & Temperature Output

0-5V or 0-10V, 0-20mA or 4-20mA output

Digital Output

UART or I2C available for flow and temperature info.

Alarm Output

Open drain, configurable trip point

Communication

I2C (400KHz) or 3.3V UART

Cable Length

2 m (6 ft.)

Housing Construction

Polycarbonate (PC), UL94-V0 (head), UL94-HB (housing)

Plenum Rated Cable

22 AWG

Environmental Protection

IP65 electronics, including conformal coated sensing element

Standard Dimension

Selectable lengths (See Section 2.3, Length)

*The air velocity sensor uses a hot bead algorithm, and at low velocities, the error in air temperature measuring grows due to self-

heating effects. The air temperature accuracy is specified as a function of velocity:

at velocities > 0.5 m/s [100 fpm] = ±1 ˚ C [1.8 ˚ F]

at velocities < 0.5 m/s [100 fpm] = ±2 ˚ C [3.6 ˚ F]

Temperature Compensation: The B-Series is a thermal airflow sensor; it is sensitive to changes in air density and indicates velocity

with reference to a set of standard conditions (21°C (70°F), 760mmHg (101.325kPa), and 0%RH). The B-Series has been designed so

that when used over the stated temperature compensation range, the sensor indicates very close to actual air velocity and minimal

compensation is only required to account for changes in barometric pressure or altitude.

Range

Accuracy*

Deadband**

-1.0 to 1.0 m/s (-200 to 200 fpm)

± (1% of reading + 0.05 m/s [10 fpm])

-0.15 to 0.15 m/s (-30 to 30 fpm)

-10 to 10 m/s (-2,000 to 2,000 fpm)

± (4% of reading + 0.10 m/s [20 fpm])

-0.5 to 0.5 m/s (-100 to 100 fpm)

-20 to 20 m/s (-4,000 to 4,000 fpm)

± (5% of reading + 0.15 m/s [30 fpm])

-1.0 to 1.0 m/s (-200 to 200 fpm)

*within compensation range

**range of velocities where the direction and velocity are not discernible by the sensor

General Specifications Table 1: Air Velocity Performance

B-Series Air Velocity Sensors USER GUIDE 67500MN00-A01

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2.2 Model Specifications

Degree Controls offers two models of the B-Series Air Velocity Sensor. The choice of model depends on the user’s

voltage range and current requirements, as noted below:

Name

Input Voltage Range

Current Consumption

B300

4.5 –15VDC

< 100mA nominal @ 12V

B500

24VAC/DC ± 20%

< 65mA nominal @ 24V

Model Specifications Table 1: Input Voltage Range & Current Consumption

2.3 Hardware Configuration

Length

1 = 203mm [8.0”]

max insertion depth = 160mm [6.3”]

2 = 305mm [12.0”]

max insertion depth = 263mm [10.4”]

Velocity Profile

A = -1.0 to 1.0 m/s (-200 to 200 fpm)

B = -10 to 10 m/s (-2,000 to 2,000 fpm)

C = -20 to 20 m/s (-4,000 to 4,000 fpm)

Output Configuration

1 = 0 –5 VDC air velocity output

2 = 0 –5 VDC air velocity and air temperature (dual

outputs)

3 = 0 –10 VDC air velocity output

4 = 0 –10 VDC air velocity and air temperature (dual

outputs)

5 = 0 - 20 mA air velocity

6 = 0 - 20 mA air velocity and air temperature (dual

outputs)

7 = 4-20 mA air velocity

8 = 4-20 mA air velocity and air temperature (dual

outputs)

9 = UART communication

Hardware Configuration Table 1: Ordering Information

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3 Wiring Information

3.1 Configured with Analog Output and UART Digital Communication

Wire Color

Wire Gauge

Description

Red

22 AWG

Power

Black

Ground

White

Velocity Analog Output

Green*

Temperature Analog Output

Orange

UART Receive (RX)

Blue

UART Transmit (TX)

Brown**

Open Drain Alarm

*Only for dual analog

**While the B300 and B500 can be configured as open drain switches; please see the Switch Series manual for

purpose-built airflow switches.

3.2 Configured Only with UART Output

Wire Color

Wire Gauge

Description

Red

22 AWG

Power

Black

Ground

White

UART Receive (RX)

Green

UART Transmit (TX)

3.3 Configured Only with I2C Output

Wire Color

Wire Gauge

Description

Red

22 AWG

Power

Black

Ground

White

SCL

Green

SDA

Notes:

1. For I2C communication, external pull-up resistors to +3.3V for SDA and SCL are required. The B300/B500

does not have internal pull-up resistors.

2. For RS232 communication, an external level shifter is required to convert 3.3V TTL to RS232 voltage

levels. The B300/B500 RX and TX signals are 3.3V TTL.

Caution:

The B300/500 sensors do not have polarity protection. Do not connect positive voltage to ground lead.

B-Series Air Velocity Sensors USER GUIDE 67500MN00-A01

B-Series Air Velocity Sensors USER GUIDE 67500MN00-A01 7

4 Mechanical Information

4.1 Probe Sensor Head Mechanical Drawings

4.2 °C Clamp Mechanical Drawing

Mechanical Figure 2: °C Clamp

Note: [inch]mm

Mechanical Figure 1: B-Series Sensor Head

Note: [inch]mm

B-Series Air Velocity Sensors USER GUIDE 67500MN00-A01

B-Series Air Velocity Sensors USER GUIDE 67500MN00-A01 8

5 Mounting and Positioning

5.1 Probe Style Sensors: B300/B500

Mounting Figure 1: Sensor Dimensions

Note: Multiple sensor lengths are available to accommodate insertion depths of 30mm [1.25"] to 245mm [9.6"]. See Mounting

Figure 1 above for insertion "zero point" datum.

The B-Series Sensor utilizes either a °C Clamp or Gland fitting for installation. Please follow the below instructions for

optimal installation:

5.1.1 Gland Installation

1. Drill a 7/8” 0.75” (20mm) hole into the surface you wish to install the Sensor into.

• Follow the below instructions to install the Sensor via Gland Fitting.

2. Adjust the Sensor’s insertion depth (use the printed ruler on the

Sensor’s body for reference), and tighten the gland nut onto

the Sensor body (“A” in Figure 2 below).

3. Insert the Sensor into the drilled hole wider flange first

(“B” in Figure 2 below), then rotate into position, ensuring that the

sensor is facing the intended direction.

4. Tighten the mounting nut (“C” in Figure 2 below) in the left-hand

direction.

Mounting Figure 2: Gland Nut

B-Series Sensor with Gland Fitting

Front View

Side View

B-Series Air Velocity Sensors USER GUIDE 67500MN00-A01

B-Series Air Velocity Sensors USER GUIDE 67500MN00-A01 9

5.1.2 °C Clamp Installation

1. Drill a 7/8” 0.75” (20mm) hole into the surface you wish to install the Sensor into.

• Follow the below text instructions along with the visuals in

Figure 4 to install the °C Clamp.

2. Peel off the adhesive backing on the back of the °C Clamp (see Figure

3 below) and place onto the drilled hole. Using the provided screws,

tighten the °C Clamp on the right and left side to the surface.

3. Insert the Sensor into the hole of the °C Clamp and adjust the

Sensor’s insertion depth (use the printed ruler on the Sensor’s body

for reference), ensuring that the sensor head (see section 5.3

Airflow Direction) is facing the intended direction.

4. Using the provided screw, tighten the °C Clamp onto the Sensor body.

Mounting Figure 3: °C Clamp

Mounting Figure 4: °C Clamp Installation

B-Series Sensor with °C Clamp Fitting

Back View Front View

Step 1

Step 2

Step 4

Step 5

Step 3

B-Series Air Velocity Sensors USER GUIDE 67500MN00-A01

B-Series Air Velocity Sensors USER GUIDE 67500MN00-A01 10

5.1.3 Airflow Direction

To ensure that the Sensor performs within its published specifications, proper mounting precautions must be followed:

• The central airflow cavity that surrounds the flow thermistor must be orientated perpendicular to the airflow

being monitored.

• When monitoring air velocity within a pipe or duct, mount the sensor so that the main flow cavity is in the

center of the pipe or duct. Avoid mounting the sensor in turbulent locations caused by elbows, duct size

changes, etc. If airflow turbulence causes excessive airflow reading variation, increasing the Sample Time (index

63)may solve the problem.

Airflow Figure 2: Direction of Airflow

6 Communication

The B-Series Sensors support two methods of communication: UART and I2C. The choice of communication is set up at

DegreeC prior to shipment.

6.1 UART

The communication protocol described below is for communication between a master host and the slave Sensor

product. This protocol is used to read/write configuration variables and to read process variables from the Sensor.

• The host can configure the Sensor by transmitting a “Memory Write” command which contains the memory

index and the new data within the command.

• The host reads configuration variables using the “Memory Read” command.

• For multi-byte configuration variables, the data format is “little endian”. The lowest address is the least

significant byte.

Four process system variables (Velocity, Tamb, Power, and Raw Velocity) can also be read from the Sensor using the

“Read Velocity”, “Read Tamb”, “Read Power”, and “Read Raw Velocity” commands, as noted in the figure below:

Indice

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