Siemens QVM62.1 Betriebsanleitung

QVM62.1

Technical Instructions

Document No. 155-006

October 26, 2006

Air Velocity Sensor

Siemens Industry, Inc.

Description This sensor is used to control the air velocity to a constant value, balance out pressure

fluctuations (supply or exhaust air control), or to monitor the flow in air ducts. It is

primarily used for modulating fan control in primary applications to set the basic volume

flow.

Application The QVM62.1 Sensor records the air velocity as a measured value and converts it to

an active 0 to 10 Vdc output signal. There are three measuring ranges available:

•0 to 16 ft/s (0 to 5 m/s)

•0 to 33 ft/s (0 to 10 m/s)

•0 to 49 ft/s (0 to 15 m/s).

The sensor measures a point (that is it measures the values at a specific location in the

flow profile. For recording the mean air velocity in the duct, the sensor’s immersion

depth is the key measure. The immersion depth depends on the flow profile.

The measurement principle is based on the anemometric measurement principle. The

specially developed thin film sensing element of the QVM62.1 is almost totally

independent from the flow direction and is insensitive to almost any kind of dirt in the

airflow.

Product Number QVM62.1

Operation The air velocity sensor consists of:

•Immersion stem with sensor head and sensing element

•Extension pipe with fitting

•Immersion stem end with flow direction arrow

•Adjustable connecting flange

•Transducer

•Connection cable, screened, four-core, 3 feet (1 m) long

Technical Instructions QVM62.1 Air Velocity Sensor

Document Number 155-006

October 26, 2006

Page 2 Siemens Industry, Inc.

Operation

(Continued) A scale with 0.20 in (0.5 cm) grating on the immersion stem and the extension pipe

indicates the immersion depth.

The connecting flange is used to attach and seal the immersion stem on the duct wall.

A plastic housing with removable cover accommodates the transducer. It can be

screwed to a flat surface.

The sensor cable is connected: the sensor and the transducer are a unit.

The measuring ranges are selected by inserting or removing a plug-in jumper.

Protection against false wiring is provided related to own voltages. (Measuring output

U1 is short-circuit proof.) The sensor head connections are not protected against 24

Vac operating voltage.

Components

Figure 1. Wiring and Setting Elements.

1 Terminal block for connection to the

immersion stem.

2 Terminal block for connection to the

controller.

3. Plug-in unit for setting the three velocity

ranges.

No plug-in jumper = 0 to 16 ft/s

(0 to 5 m/s)

Plug-in on 1 and 2 = 0 to 32 ft/s

(0 to 10 m/s)

(Factory setting)

Plug-in on 2 and 3 = 0 to 49 ft/s

(0 to 15 m/s)

Specifications

Power supply

Operating voltage 24 Vac +/- 20%

Frequency 50/60 Hz

Power consumption < 5 VA (maximum 200 mA)

Output impedance <20 ohm

Measuring data

Measuring ranges, adjustable 0 to 16 ft/s (0 to 5 m/s)

0 to 33 ft/s (0 to 10 m/s)

(factory setting)

0 to 49 ft/s (0 to 15 m/s)

Measuring accuracy at 68°F (20°C), 45% rh, + 0.7 ft/s (0.2 m/s + 3% of measured

1013 hPa value)

Permissible air velocity 66 ft/s (20 m/s)

Direction dependence < 0.3% of measured value at< + 10°

Time constant t90 at 10 m/s ca. 4 seconds

Signal output U1

Voltage 0 to 10 Vdc

Current + 1 mA

Line length Permissible length to controller at:

20 AWG copper cable 164 ft (50 m)

18 AWG copper cable 492 ft (150 m)

16 AWG copper cable 984 ft (300 m)

Line length to the sensor head 3 ft (1 m) (prewired)

QVM62.1 Air Velocity Sensor Technical Instructions

Document Number 155-006

October 26, 2006

Siemens Industry, Inc. Page 3

Connections

Mechanical Screw connection

Electric Screw terminal, maximum 2 × 18 AWG

Degree of protection

Degree of protection provided by enclosures

as per EN 60 529

Transducer IP 42

Sensor head IP 20

Degree of protection as per EN 60 730 III

Environmental conditions

Climatic conditions

Temperature 23°F to 113°F (-5°C to 45°C)

Humidity (non-condensing) <95% rh

Mechanical conditions Class 3M2

Chemical conditions Class 3C2

Storage (transducer and immersion stem)

Temperature 23°F to 113°F (-5°C to 45°C)

Humidity (non-condensing) <95% rh

Mechanical conditions Class 1M2

Transportation

Temperature 23°F to 113°F (-5°C to 45°C)

Humidity (non-condensing) <95% rh

Mechanical conditions Class 2M2

Materials and colors

Housing bottom Polycarbonate, RAL 7001 (silver-gray)

Housing cover Polycarbonate, RAL 7035 (light gray)

Sensor pipes Polycarbonate, RAL 7001 (silver-gray)

Sensor head, extension, enc Polycarbonate, RAL 7035 (light gray)

Connecting flange Polycarbonate, RAL 7001 (silver gray)

Sensor Silicone-free

Weight

With packaging 12 oz (0.352 kg)

Engineering Notes

Place the sensor in a location where the airflow is quiet. Do not place it close to

dampers, registers or duct direction changes.

Figure 2. Sensor Placement.

Use a transformer with safety extra-low voltage (SELV) and separate winding for 100%

ON-time.

Observe all local safety rules and regulations pertaining to sizing and protecting

transformers.

Note the permissible line length to the controller.

Technical Instructions QVM62.1 Air Velocity Sensor

Document Number 155-006

October 26, 2006

Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as

Siemens Industry, Inc.

Building Technologies Division

1000 Deerfield Parkway

Buffalo Grove, IL 60089

+ 1 847-215-1000

Your feedback is important to us. If you have

comments about this document, please send them

to sbt_technical.editor.us.sbt@siemens.com

Document No. 155-006

Printed in the USA

Page 4

Mounting and

Installation Notes Mount the immersion stem so that the air flows through the opening at the sensor head.

The immersion stem is pre-mounted and wired to the transducer on delivery. The

sensor pipes and the end with the direction arrow are prearranged on the connecting

cable; fit them together (use the direction-oriented snap-on connections). If the

extension pipe is not required, remove it from the cable. The connecting flange is not

attached on delivery.

The sensor is supplied with Installation Instructions.

Commissioning

Notes

Check the wiring and air velocity range settings prior to commissioning.

Check the immersion stem position in the air duct (see Installation Instructions).

Wiring Diagram

Figure 3. Wiring Diagram.

G 24 Vac operating voltage

M Measuring neutral/operating voltage

ground

U1 0 to 10 Vdc output signal

Dimensions

Figure 4. Dimensions in Inches (Millimeters).

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