Siemens QFA2000 Bedienungsanleitung

CE1N1857en

06.06.2005

Siemens Building Technologies

HVAC Products

1857

Room Sensors QFA20…

for relative humidity and temperature

•Operating voltage AC 24 V or DC 13.5…35 V

•Signal output DC 0...10 V for relative humidity

•Signal output DC 0...10 V or LG-Ni 1000 or T1 for temperature

•Accuracy of ±3 % r.h. within comfort range

•Range of use −15…+50 °C / 0…95 % r. h. (non-condensing)

Use

In ventilating and air conditioning plants to acquire

•relative humidity and

•temperature

in rooms.

The QFA20… is used as a

•control sensor and

•measuring sensor for building automation and control systems or indicating units.

Type summary

Type

reference Temperature

measuring range Temperature

signal output Humidity

measuring range Humidity

signal output Operating voltage

QFA2000 None None 0...100 % Active, DC 0...10 V AC 24 V or DC 13.5…35 V

QFA2020 0...50 °C Passive, LG-Ni 1000 0...100 % Active, DC 0...10 V AC 24 V or DC 13.5…35 V

QFA2040 0...50 °C Passive, T1 0...100 % Active, DC 0...10 V AC 24 V or DC 13.5…35 V

QFA2060 0...50 °C / −35...+35 °C Active, DC 0...10 V 0...100 % Active, DC 0...10 V AC 24 V or DC 13.5…35 V

1857P01

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Siemens Building Technologies Room sensors QFA20… CE1N1857en

HVAC Products 06.06.2005

Ordering

When ordering, please give name and type reference.

Equipment combinations

All systems or devices capable of acquiring and handling the sensor’s DC 0...10 V,

LG-Ni 1000 or T1 output signal.

When using the passive sensors for averaging, we recommend to use the SEZ220

signal converter (refer to Data Sheet N5146).

Mode of operation

The sensor acquires the relative humidity in the room via its capacitive humidity sens-

ing element whose electrical capacitance changes as a function of the relative humidity.

The electronic measuring circuit converts the sensor’s signal to a continuous

DC 0...10 V signal, which corresponds to 0...100 % relative humidity.

The sensor acquires the temperature in the room via its sensing element whose electri-

cal resistance changes as a function of the temperature.

Depending on the type of sensor, this change in resistance is converted either to an

active DC 0…10 V output signal ( 0… 50 °C or –35…+35 °C) or is provided as a

simulated passive LG-Ni 1000 or T1 output signal.

The measuring current from systems/devices für acquiring the electrical resistance of

the passive sensor differs greatly and impacts self-heating of the temperature sensing

element at the end of the measuring probe. To compensate the impact, the passive

output signal is simulated with an electronic circuit.

Characteristic LG-Ni 1000 Characteristic T1 (PTC)

−40 −30 −20 −10 01020304050607080

1400

1200

1000

800

600

R [Ω]

[°C]

1811D01

−50

ϑ−40 −30 −20 −10 0 10 20 30 40 50 60 70 80

3000

2600

2200

1800

1400

R [Ω]

[°C]

1864D01

1600

2000

2400

2800

3200

R Resistance value in Ohm

ϑTemperature in degrees Celsius

Mechanical design

The units have been designed for wall mounting. They are suitable for use with most

commercially available recessed conduit boxes. The cables can be introduced from the

rear (concealed wiring) or from below or above (surface-run wires) through knock-out

openings.

The units consist of two major sections: Casing and baseplate. Both snap together but

can be detached again.

The measuring circuit, the sensing elements and the setting element are located on the

printed circuit board inside the casing.

The baseplate carries the connecting terminals.

Relative humidity

Temperature

Simulated passive

output signal

Sensing elements,

simulated

Legend

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HVAC Products 06.06.2005

R1 0 V

5 V

10 V

5 V

0 V

5 V

10 V

U1 U2 BS-MS

75 °C

35 °C

20 °C

R3 20 °C

Measuring range

Test function active

1857Z01en

The setting element is accessible after removing the baseplate. It consists of 6 pins and

a shorting plug. It is used to select the required measuring range and to activate the

test function.

The different plug positions have the following meaning

•For the passive temperature measuring range:

Shorting plug in the mid position (R2) = LG-Ni 1000 or T1

•For the activating temperature measuring range:

Shorting plug in the upper position (R1) = −35...+35 °C,

Shorting plug in the mid position (R2) = 0...50 °C (factory setting),

Shorting plug in the lower position (R3) = 0...50 °C

•For activating the test function:

Shorting plug in the vertical position: The values according to the table "Test function

active" will be made available at the signal output.

•Should the temperature sensor become faulty, there will be after 60 seconds a volt-

age of 0 V at signal output U2 or signal output BS-MS −35 °C, and the humidity

signal at signal output U1 will reach 10 V

•Should the humidity sensor become faulty, there will be a voltage of 10 V at signal

output U1 after 60 seconds, and the temperature signal will remain active

Engineering notes

To power the sensor, a transformer for safety extra low-voltage (SELV) with separate

windings for 100 % duty is required. When sizing and protecting the transformer, the

local safety regulations must be observed.

When sizing the transformer, the power consumption of the room sensor must be taken

into consideration.

For correct wiring of the sensor, refer to the Data Sheets of the devices with which the

sensor is used.

The permissible line lengths must be observed.

When laying the cables, it must be observed that the longer the cables run side by side

and the smaller the distance between them, the greater the electrical interference.

Shielded cables must be used in environments with EMC problems.

Twisted pair cables are required for the secondary supply lines and the signal lines.

Fitting notes

On an inner wall of the space to be air conditioned. Not in recesseds, shelves, not be-

hind curtains, not opposite or near heat sources.

The unit must not be exposed to spot lights or direct solar radiation.

The end of the conduit at the sensor must be sealed to prevent false measurements

due to draughts through the conduit.

Installation instructions are printed on the packing.

Setting element

Fault

Cable routing and

cable selection

Location

Installation instructions

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HVAC Products 06.06.2005

Commissioning notes

Check wiring before switching on power. The temperature measuring range must be

selected on the sensor, if required.

Wiring and the output signals can be checked by making use of the test function (refer

to "Mechanical design").

We recommend not to use voltmeters or ohmmeters directly at the sensing element. In

the case of the simulated passive output signals, measurements with commercially

available metres cannot be made (measuring current too small).

Technical data

Operating voltage AC 24 V ±20 % or DC 13.5...35 V

Frequency 50/60 Hz at AC 24 V

Power consumption ≤1 VA

Perm. cable lengths refer to Data Sheet of the device

handling the signal

Range of use 0…95 % r. h. (non-condensing)

Measuring range 0…100 % r. h.

Measuring accuracy at 23 °C and AC 24 V

0...95 % r.h.

30...70 % r.h.

±5 %

±3 %, typically

Temperature dependency ≤0.1 % r.h./°C

Time constant 2 min

Perm. air velocity 20 m/s

Output signal, linear (terminal U1) DC 0...10 V 0...100 % r. h.,

max. ±1 mA

Range of use −15...+50 °C

Measuring range 0...50 °C / −35...+35 °C

Sensing element NTC 10 kΩ

Measuring accuracy at

15...35 °C

−35...+50 °C

±0.8 K

±1 K

Time constant 8 min (depending on air movement

and thermal coupling to the wall)

Output signal, linear (terminal U2) DC 0...10 V 0...50 °C / −35...+35 °C

max. ±1 mA

Measuring range 0...50 °C

Sensing element simulated, corresponding to

QFA2020

QFA2040 (serie B or higher)

LG-Ni 1000

T1 (PTC)

Measuring accuracy at

15...35 °C

−35...+50 °C

±0.8 K

±1 K

Time constant 8 min (depending on air movement

and thermal coupling to the wall)

Perm. measuring current with

QFA2020

QFA2040

1.18…3.29 mA

0.53…1.46 mA

Housing IP 30 to IEC 529

Safety class III to EN 60 730

Screw terminals for 1 ×2.5 mm2oder 2 ×1.5 mm2

Power supply

Cable lengths for

measuring signal

…

Functional data of

humidity sensor

…

Functional data of

temperature sensor with

QFA2060

Functional data of

temperature sensor with

QFA2020, QFA2040

…

Degree of protection

Electrical connections

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Siemens Building Technologies Room sensors QFA20… CE1N1857en

HVAC Products 06.06.2005

Operation to

Climatic conditions

Temperature (housing with electronics)

Humidity

Mechanical conditions

IEC 721-3-3

class 3K5

−15...+50 °C

0…95 % r. h (non-condensing)

class 3M2

Transport to

Climatic condition

Temperature

Humidity

Mechanical conditions

IEC 721-3-2

class 2K3

−25...+70 °C

<95 % r. h.

class 2M2

Housing front ASA + PC, NCS S 0502-G (white)

Bottom section of housing ASA + PC, NCS 2801-Y43R (grey)

Base PC, NCS 2801-Y43R (grey)

Sensor (complete assembly) silicon-free

Packaging corrugated cardboard

Product safety

Automatic electrical controls for household

and similar use

EN 60 730-1

Electromagnetic compatibility

Immunity

Emissions

EN 61 000-6-1

EN 61 000-6-3

conformity to EMC directive 89/336/EEC

conformity to

Australian EMC framework

Radio Interference Emission Standard

Radio Communication Act 1992

AS/NZS 3548

Incl. packaging approx. 0.13 kg

Environmental

conditions

Materials and colors

Standards

…

Weight

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Siemens Building Technologies Room sensors QFA20… CE1N1857en

HVAC Products 06.06.2005

Internal diagram

QFA2060 QFA2020,

QFA2040 (serie B or higher) QFA2000

G0 U1 U2

1857G01

r.h. R1 = −35...+35 °C /

R2 = 0...50 °C

G0 U1 BS

1857G02

r.h. MS

G0 U1

1857G03

r.h.

G, G0 Operating voltage AC 24 V (SELV) or DC 13.5...35 V

U1 Signal output DC 0...10 V for relative humidity 0...100 %

U2 Signal output DC 0...10 V for temperature range 0...50 °C (R2 = factory setting)

or −35...+35 °C

BS, MS Signal output LG-Ni 1000 oder T1 (passive, simulated) for temperature range 0…50 °C;

the wires must not be interchanged

Dimensions

100

4,2

9,5

1857M01

Drilling plan

Dimension in mm

…

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