E+E Elektronik EE671 Product Manual

USER MANUAL

EE671 - Miniature Air Flow Probe

GENERAL

The EE671 air velocity sensor operates on the hot-film anemometer principle and features an innovative, very robust E+E
sensing element manufactured in thin-film technology combined with innovative transfer-molding.
The mounting flange allows for correct positioning and easy adjustment of the immersion depth.
EE671 is dedicated for accurate and reliable measurement in building automation and ventilation applications. For special
applications do not hesitate to contact the manufacturer or their local distributor.

CAUTION

• Accurate measurement results are conditioned by the correct positioning of the probe in the air stream. Best accuracy is
achieved in laminar flow.

• Observe the minimum inlet and outlet path length, see page 4.

• Avoid mechanical stress on the probe and especially onto the sensing head.

• Observe the humidity working range 5…95 % RH, non-condensing.

• Avoid installation in corrosive environment, as this may lead to sensor destruction.

ELECTRICAL CONNECTION

Important note:
The manufacturer cannot be held responsible for personal injuries or damage to property as a result of incorrect handling,
installation, wiring, power supply and maintenance of the device.

Please note:

The device may only be powered with a power supply class III   (Europe) or with a class 2 supply (North America).



EE671 is an ESD-sensitive device. It is neither short-circuit-proof, nor surge-proof. The digital communication lines



may not be connected to the supply lines.

34

5

1 2

Pin number Wire colour Analogue output Digital interface

1 grey SDA (digital setup interface E2) V+ = Supply voltage

2 brown GND RS485 B (D-)

3 green AV = Analogue output GND

4 yellow SCL (digital setup interface E2) RS485 A (D+)

5 white V+ = Supply voltage n.c.

front view on

M12 sensor plug

Accessory HA0108xx - connecting cable

DIMENSIONS mm (inch)

Cable version:

15 (0.6“)

ø12

(0.47“)

Plug version:

15 (0.6“)

ø12

(0.47“)

130 (5.12“)

115 (4.53“)

Führungssteg / alignment strip

121 (4.76“)

106 (4.17“)

Führungssteg / alignment strip

Analogue output Digital interface

1 brown SDA (digital setup interface E2) V+ = Supply voltage

2 white GND RS485 B (D-)

3 blue AV = Analogue output GND

4 black SCL (digital setup interface E2) RS485 A (D+)

5 grey V+ = Supply voltage n.c.

Front view sensor head:

13.4 (0.53“)

1.5 (0,06“)

10 (0.4“)

M12x1

Führungssteg /
alignment strip

Flange:

44 (1.7“)

6 (0.2“)

80 (3.14“)

60 (2.4“)

Detail A

24.5 (0.9”)

15.8 (0.62”)

2.5 (0.1”)

Recess for alignment strip

Detail A:

1

TECHNICAL DATA

Air Velocity

Measurement range 0...5 m/s (0...1000 ft/min)

0...10 m/s

0...15 m/s

0...20 m/s

(0...2000 ft/min)
(0...3000 ft/min)

(0...4000 ft/min)

Accuracy1) ±(0.2 m/s / 40 ft/min + 3 % of mv): 0.5...5 m/s (100...1000 ft/min)

at 20 °C (68 °F) / 45 % RH and 1013 hPa (14.7 psi) ±(0.3 m/s / 60 ft/min + 4 % of mv): 1... 10 m/s (200...2000 ft/min)

±(0.35 m/s /

mv = measured value ±(0.4 m/s / 80 ft/min + 6 % of mv): 1... 20 m/s (200...4000 ft/min)

70 ft/min + 5 % of mv): 1... 15 m/s (200...3000 ft/min)

Analogue output signal 0 - 1 / 5 / 10 V2), max. 1 mA

Digital interface RS485 with Modbus RTU protocol (EE671 = 1 unit load)

Response time

τ

, typ. 4 s

90

General

Supply voltage (Class III) 10 - 29 V DC
Current consumption, max. 50 mA at 20 m/s

Connection Cable 0.5 m

(1.6 ft) / 2 m (6.6 ft) cable, PVC, 5x0.25 mm² (AWG 23) with ferrules

Plug M12 connector, 5-pin

Electromagnetic compatibility

3)

EN 61326-1 EN 61326-2-3 Industrial Enviroment

FCC Part15 Class A ICES-003 Class A

Material / protection rating Polycarbonate / IP50 (probe head); IP54 (enclosure)
Temperature range Operation -20...60 °C
Storage -30...60 °C
Humidity range 5...95 % RH (non-condensing)

1) The accuracy statement includes the uncertainty of the factory calibration with an enhancement factor k=2 (2-fold standard deviation). The tolerance was calculated in

accordance with EA-4/02 following the GUM (Guide to the Expression of Uncertainty in Measurement).

2) 0 - 10 V version only with supply voltage ≥ 15 V

3) The EE671 is not short-circuit-proof and not surge-proof (ESD-sensitive device).

(4000 ft/min)

(-4...140 °F)

(-22...140 °F)

SCOPE OF SUPPLY

• EE671 sensor according to ordering guide

• Protection cap

• Mounting flange

• Quick guide

MODBUS RTU

The EE671 air flow probe represents 1 unit load in a Modbus RTU network. For Modbus protocol settings see Modbus Application

Note AN0103 (www.epluse.com/ee671).

Factory settings: Modbus address 238, Baud rate 9 600, even parity, 1 stop bit. The Modbus address can be customised in the
register 0x00 (value margin 1 - 247 permitted). Selectable Baud rates are 9 600, 19 200 and 38 400, parity may be even, odd or none.

Device address, Baud rate and parity can be set via:

1. PCS10 Product Configuration Software and the appropriate configuration cable HA011018.
The PCS10 can be downloaded free of charge from www.epluse.com/pcs.

2. Modbus protocol in the register 60001 (0x00) and 60002 (0x01).

Measured value Unit Scaling Type Register [DEC] Protocol address [HEX]

Read registers (function code 0x03 / 0x04)

Serial number ASCII 0001 0x00
Software version Binary 0009 0x08
Sensor name ASCII 0010 0x09
Temperature °C 32 bit float 1003 0026 0x3EA 0x19

2) 3)

Temperature °F 32 bit float 1005 0028 0x3EC 0x1B
Temperature K 32 bit float 1009 0030 0x3F0 0x1D
Air velocity m/s 32 bit float 1041 0032 0x410 0x1F
Air velocity ft/min 32 bit float 1043 0034 0x412 0x21
Temperature °C x 100 x 100 16 bit integer 4002 0046 0xFA1 0x2D

1)

2) 3)

Temperature °F x 50 x 100 16 bit integer 4003 0047 0xFA2 0x2E
Temperature K x 50 x 100 16 bit integer 4005 0048 0xFA4 0x2F
Air velocity m/s x 100 x 100 16 bit integer 4021 0049 0xFB4 0x30
Air velocity ft/min x 1 x 10 16 bit integer 4022 0050 0xFB5 0x31

Write registers (function code 0x06)

Modbus address 0001 0x00
Communication parameters 0002 0x01

1) Please observe correct scaling for used registers

2) Measured values available in both registers

3) Registers in right column not intended for new design (0026...0050 / 0x19...0x31)

left column E+E standard registers, right column legacy registers

}

2) 3)

2

MOUNTING

Whenever possible use the mounting flange for installing the EE671. The flange allows for correct positioning in the flow and for easy

adjustment of the immersion depth.

The arrows engraved on the sensing head of EE671 and on the mounting flange indicate the direction of the air stream during factory
adjustment.
Observe the direction of the arrow when installing the mounting flange.
Once the mounting flange is correctly aligned to the air flow direction, the alignment strip along the probe assures that the EE671 is
also correctly aligned.

CORRECT

INCORRECT

Air flow

MOUNTING INTO A DUCT

conventional drilling:

>16 (0.63")

air flow

60 (2.4")

The mounting flange allows also for precise setting of the EE671 immersion depth. The entire sensing head must be in the air flow to
be measured.

laser cutting:

>6.2 (0.2")

>16

(0.63")

60 (2.4")

By leaving a key notch,

the ange can be mounted
only in the correct direction.

<2.8

(0.1")

CORRECT INCORRECT

Immersion depth = 30 % - 50 %
of the duct diameter

Air flow

duct diameter

When installing the EE671 probe without the mounting flange, make sure that the arrow on the sensing head matches exactly the flow

direction.

CORRECT INCORRECT

air flow

3

MOUNTING GUIDELINES FOR AIR VELOCITY MEASURING DEVICES

For accurate measurement results it is of paramount importance to place the sensing probe at a location with low turbulence, such as
after filters, rectifiers, heaters or coolers. Turbulence appears after obstructions like fans, bends, junctions or section changes in the

duct (diffusers / confusers), so the probe shall be placed far enough from these. The minimum length of the settling zone (straight duct
section without obstructions whatsoever) between the probe and the source of turbulence depends on the diameter of the duct. An

“equivalent diameter” D

The following pictures supply guidelines for correct installation of air velocity transducers with respect to location and to minimum

recommended settling zones.

can be defined for a rectangular duct with dimensions a · b:

gl

Install the sensor in the middle of the duct.

The preferred position of the sensor is after a filter.

<6D

<6D

+

>6D

Place the sensor in front of the diffusers at a position with high air
velocity.

>3D

Place the sensor at a position with laminar (non turbulent) flow.

Turbulence appears after fans as well as after bends, junctions, air hea­ter, air cooler, filters, flaps or diameter changes in the duct.

>6D

>3D

>6D

MAINTENANCE OF THE E+E AIR VELOCITY SENSORS

Due to the absence of moving parts, the E+E air velocity sensors are not subject to wear. The construction (shape, dimensions and
materials) of the hot film air velocity sensor is per se highly insensitive to dust and dirt. No maintenance is required under normal

environmental conditions. For operation in polluted environment it is advisable to periodically clean the sensing head by washing it in
isopropyl alcohol, preferably in an ultrasound cleaner. Alternatively shake it gently few minutes in a pot with isopropyl alcohol and let it
dry free. Do not touch or rub the sensor and do not use any mechanical tools for cleaning.

4

USA
FCC notice:

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the installation manual, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or

more of the following measures:

- Reorient or relocate the receiving antenna.

- Increase the separation between the equipment and receiver.

- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

- Consult the dealer or an experienced radio/TV technician for help.

CANADIAN
ICES-003 Issue 5:

CAN ICES-3 B / NMB-3 B

INFORMATION

E+E Elektronik Ges.m.b.H.

Langwiesen 7 • 4209 Engerwitzdorf • Austria
Tel: [phone] • Fax: [phone]

[e-mail] • www.epluse.com

LG Linz Fn 165761 t • UID-Nr. ATU44043101
Place of Jurisdiction: A-4020 Linz • DVR0962759

[phone] / [e-mail]

BA_EE671 // v2.7 // Modication rights reserved