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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

G

1857

G

0

1

r.h.

R1 = 

−

35...

+

35 °C /

R2 = 0...50 °C

 

G0

U1

BS

G

1857G

02

r.h.

MS

 

G0

U1

G

1857G

03

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 

90

10

0

36

4,2

9,

5

56

60

56

60

18

57

M

0

1

 

 Drilling 

plan 

 

Dimension in mm 
 

 

…
.
.

©

2004 Siemens Switzerland Ltd 

Subject to change

Содержание QFA2000

Страница 1: ...tive 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...

Страница 2: ...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 0 10 20 30 40 50 ...

Страница 3: ...re 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 sen...

Страница 4: ...cally 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...

Страница 5: ...nt 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 Austra...

Страница 6: ...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 90 100 36 4 2 9 5 56 60 56 60 1857M01 Drilling plan Dimension in mm 200...

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