User Manual

ManualsBrandsSiemens ManualsSensors HumidityRoom sensor QFA65.1

CM1N1850E

14.07.2003

Siemens Building Technologies

HVAC Products

850

Room Sensor

QFA65.1

for relative humidity and temperature

Operating voltage AC 24 V

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

Signal output LG-Ni 1000 (passive) for temperature

Accuracy of ±

±±

±3 % r.h. within comfort range

Use

In ventilating and air conditioning plants to acquire

• relative humidity and

• temperature

in rooms.

The QFA65.1 is used as a

• control sensor and

• measuring sensor for building automation systems or indicating units.

Ordering

When ordering, please give name and type reference.

Equipment combinations

All systems/units that are capable of acquiring and handling the sensor's DC 0...10 V

output signal.

1851P010

Summary of content (4 pages)

PAGE 1
1851P010 850 QFA65.1 Room Sensor for relative humidity and temperature Operating voltage AC 24 V Signal output DC 0...10 V for relative humidity Signal output LG-Ni 1000 (passive) for temperature Accuracy of ± 3 % r.h. within comfort range Use In ventilating and air conditioning plants to acquire • relative humidity and • temperature in rooms. The QFA65.1 is used as a • control sensor and • measuring sensor for building automation systems or indicating units.
PAGE 2
Mode of operation Relative humidity The sensor acquires the relative humidity with the help of a capacitive humidity sensor whose electrical capacity changes in function of the relative humidity of the ambient air. An electronic circuit converts the sensor's signal into a continuous DC 0...10 V signal, which represents 0...100 % relative humidity.
PAGE 3
Technical data Humidity sensor Range of use 10...95 % r.h. Measuring accuracy at 20 °C 20...90 % r.h. ±5 % r.h. 40...60 % r.h. ±3 % r.h., (typical) Time constant ≤2 min Output signal, linear DC 1...9 V 10...90 % r.h. Output current ±1 mA max. Perm. line lengths Copper cable 0.6 mm dia. 50 m 2 Copper cable 1 mm 150 m Copper cable 1.5 mm2 300 m If the required line length exceeds 300 m, it needs to be shielded. Temperature sensor Range of use Sensing element Measuring accuracy at 20 °C Time constant Perm.
PAGE 4
1850G01 Internal diagram LG-Ni 1000 r.H. M(5) G G0 U B M Notes: (2) (1) (3) (6) (5) B(6) G0(1) G(2) U(3) System potential AC 24 V System and relative humidity measuring neutral Measuring signal DC 1...9 V for 10...90 % r.h. Measuring signal LG-Ni 1000 (passive) for temperature Temperatur sensor measuring neutral The number in parentheses corresponds to the terminal label on the terminal block.