CE1N1857en 2018-03-23 Building Technologies 1 857 QFA20..QFA2060D Room sensorsQFA20.. For relative humidity and temperature ∑ Operating voltage AC 24 V or DC 13.5…35 V ∑ Signal output DC 0...10 V / 4…20 mA for relative humidity ∑ Signal output DC 0...10 V / 4…20 mA / 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 QFA2000NoneNone0...100 %active, DC 0...10 VAC 24 V or DC 13.5…35 V QFA2001NoneNone0...100 %active, 4…20 mADC 13.5…35 V QFA20200...50 °Cpassive, LG-Ni 10000...100 %active, DC 0...10 VAC 24 V or DC 13.5…35 V QFA20400...50 °Cpassive, T1 (PTC)0...100 %active, DC 0...10 VAC 24 V or DC 13.5…35 V QFA2060 0...50 °C / - 35... + 35 °C / - 40…+70 °C active, DC 0...10 V0...100 %active, DC 0...10 VAC 24 V or DC 13.5…35 V QFA2060D QFA2071 0...50 °C / - 35... + 35 °C / - 40... + 70 °C active, 4…20 mA0...100 %active, 4…20 mADC 13.5…35 V 1 8 5 7 P 0 12/8 SiemensRoom sensors QFA20..CE1N1857en Building Technologies2018-03-23 Ordering and delivery When ordering, please give name and type reference, e.g.: Room sensor QFA2060D. Equipment combinations All systems or devices capable of acquiring and handling the sensor’s DC 0...10 V, 4…20mA, LG-Ni 1000 or T1 output signal. When using the sensors for minimum or maximum selection, for averaging, or to calcu- late enthalpy, enthalpy difference, absolute humidity, and dew point, we recommend to use the SEZ220 signal converter (see 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 or 4…20 mA 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. This change in resistance is converted to an active DC 0…10 V or 4…20 mA output signal, corresponding to a temperature range of 0… 50 °C, –35…+35 °C, or - 40... + 70 °C. The measuring range can be selected. The temperature is provided as a simulated passive LG-Ni 1000 or T1 output signal ( 0…50 °C) as an alternative to the active output signal. The measuring current from systems/devices to acquire the electrical resistance of the passive sensor differs greatly and impacts self-heating of the temperature sensing ele- ment at the end of the measuring tip. To compensate the impact, the passive output signal is simulated with an electronic circuit. Characteristic LG-Ni 1000Characteristic T1 (PTC) R Resistance value in Ohm J Temperature in degrees Celsius Relative humidity Temperature Simulated passive output signal Sensing elements, simulated Legend3/8 SiemensRoom sensors QFA20..CE1N1857en Building Technologies2018-03-23 Output signal, terminal I1 / I2 010203040 700 400 300 800 900 600 500 100 0 200 B u r d e n [ O h m ] [DC V] Operating voltage Admissible range Inadmissible range! 1 8 6 4 D 0 3 e n Mechanical design The room sensors have been designed for wall mounting. They are suitable for use with most commercially available recessed conduit boxes. The cables can be intro- duced from the rear (concealed wiring) or from below or above (surface-run wires) through knock-out openings. The two-part housing comprises a casing and a 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. The type QFA2060D provides the measured values on its LCD display. The following measured values are displayed alternately in intervals of 5 s: - Temperature: in °C or °F - Humidity:in % r.h. The setting elements are located in the casing. A setting element consists of 6 pins and a jumper. It is used for selecting the required temperature measuring range and for activating the test function. Types with LCD display have a second setting element with 4 pins and a jumper. The different jumper positions have the following meaning: ∑ For the passive temperature measuring range (QFA2020, QFA2040): Jumper in the middle position (R2) = LG-Ni 1000 or T1 (0...50 °C) ∑ For the active temperature measuring range: Jumper in the upper position (R1) = - 35... + 35 °C, Jumper in the middle position (R2) = 0...50 °C (factory setting), Jumper in the lower position (R3) = –40…+70 °C Burden diagram Measured value display Setting element4/8 SiemensRoom sensors QFA20..CE1N1857en Building Technologies2018-03-23 ∑ For activating the test function: Jumper in the vertical position: The values according to the table "Test function ac- tive" will be made available at the signal output. ∑ For the measured value display (QFA2060D) - Jumper horizontal, in the upper position = °F - Jumper horizontal, in the lower position = °C (factory setting) ∑ Should the temperature sensor become faulty a voltage of 0 V (4 mA) will be applied at signal output U2 (I2) or signal output BS-MS becomes high impedance (>1 Mȍ) after 60 seconds, and the humidity signal at signal output U1 (I1) will reach 10 V (20 mA). ∑ Should the humidity sensor become faulty a voltage of 10 V (20 mA) will be applied at signal output U1 (I1) after 60 seconds, and the temperature signal will remain ac- tive. Engineering notes Room sensors with active outputs have a high power loss, which can influence temper- ature measurement. The degree of influence depends on the operating voltage and is compensated in the Symaro TM room sensors for an operating voltage of AC 24 V or DC 24 V. Over- or undercompensation may occur for other operating voltages. Furthermore, the measuring accuracy is impacted by the following factors: - Prevailing air flow - Wall surface (rough, smooth) - Wall texture (wood, plaster, concrete, brick) - Wall type (interior, exterior). This application-specific measuring inaccuracy is constant for an installed sensor after approx. 1 operating hour, and it can be adjusted as needed in a higher system (e.g. controller). No correction on the local LCD. A transformer for safety extra low-voltage (SELV) with separate windings for 100 % duty is required to power the sensor. When sizing and protecting the transformer, the local safety regulations must be complied with. 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 considered. It must be considered for routing of cables 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. Terminals G1( + ) and I1( - ) of the humidity output must always be connected to power, even if only terminals G2( + ) and I2( - ) of the temperature output are used! G1( + ) and I1( - ) are galvanically isolated towards G2( + ) and I2( - ). Malfunction Cable routing and cable selection Note toQFA20715/8 SiemensRoom sensors QFA20..CE1N1857en Building Technologies2018-03-23 Mounting notes Inside wall (not on outside wall!) of the room to be air conditioned; not in recesses, behind curtains, above or close to heat sources or shelves not on walls behind which a chimney is located. The unit must not be exposed to spot lights or direct solar radiation. The unit must not be exposed to spot lights or direct solar radiation. Install the sensor in the occupied space about 1.5 m above the floor and at least 50 cm from the next wall. The end of the conduit at the sensor must be sealed to prevent false measurements due to draughts through the conduit. Mounting instructions are printed on the inner side of the package. It is of great importance to understand that a humidity sensor is a sensitive measure device and needs to be handled with care. Chemical vapors at high concentration in combination with long exposure times may offset the sensor reading. 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 meters cannot be made (measuring current too small). Disposal The devices are considered electronics devices for disposal in term of European Di- rective 2012/19/EU and may not be disposed of as domestic waste. ∑ Dispose of the device via the channels provided for this purpose. ∑ Comply with all local and currently applicable laws and regulations. Location Mounting instructions Chemical vapors6/8 SiemensRoom sensors QFA20..CE1N1857en Building Technologies2018-03-23 Technical data Operating voltageAC 24 V ± 20 % or DC13,5…35 V (SELV) or AC/DC 24 V class 2 (US) Frequency50/60 Hz at AC 24 V External supply line protection Fuse slow max. 10 A or Circuit breaker max. 13 A Characteristic B, C, D according to EN 60898 or Power source with current limitation of max. 10 A Power consumption QFA2… QFA2001 QFA2071 QFA2020, QFA2040 £ 0.4VA £ 0.7W £ 1.4W £ 1VA Perm. cable lengthsSee data sheet for the device handling the signal Range of use0…95 % r.h. (non-condensing) Measuring range0…100 % r.h. Measuring accuracy (*) at 23 °C and AC/DC 24 V and at 0...95 % r.h. 30...70 % r.h. (*) Values for output signal sensor types with 0-10 V signal: only for AC 24 V and 4…20 mA signal: only for DC 24 V ± 5 % r.h. ± 3 % r.h. Temperature dependency £ 0.1 % r.h./°C Time constant< 20 s Output signal, linear (terminal U1)DC 0...10 V 0...100 % r.h., max. 1 mA Output signal, linear (terminal I1) Burden 4…20 mA 0...100 % r.h. refer to "Mode of operation" Range of use - 15...+50 °C Measuring range0...50 °C (R2 = factory setting), - 35... + 35 °C (R1) or - 40…+70 °C (R3) Sensing elementNTC 10k Measuring accuracy at AC/DC 24 V and at 23 °C 15...35 °C - 35...+50 °C ± 0.3 K ± 0.7 K ± 1 K Time constant8.5 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 / –40…+70 °C max. 1 mA Output signal, linear (terminal I2) Burden 4…20 mA 0...50 °C / - 35...+35 °C / - 40...+70 °C refer to "Mode of operation" Power supply Cable lengths for measuring signal Functional data of humidity sensor Functional data of temperature sensor with QFA2060(D), QFA21717/8 SiemensRoom sensors QFA20..CE1N1857en Building Technologies2018-03-23 Measuring range0...50 °C Sensing element simulated, corresponding to QFA2020 QFA2040 LG-Ni 1000 T1 (PTC) Measuring accuracy at AC/DC 24 V and at 15...35 °C - 35...+50 °C ± 0.7 K ± 1 K Time constant8.5 min (depending on air movement and thermal coupling to the wall) Perm. measuring current with QFA2020 QFA2040 1.18…4.21 mA 0.53…1.89 mA Protection degree of housingIP30 according to EN 60529 Protection classIII according to EN 60730 Screw terminals for1 ¥ 2.5 mm 2 or 2 ¥ 1.5 mm 2 Operation to Climatic conditions Temperature (housing with electronics) Humidity Mechanical conditions IEC 60721-3-3 Class 3K5 - 15...+50 °C 0…95 % r. h (non-condensing) Class 3M2 Transport to Climatic condition Temperature Humidity Mechanical conditions IEC 60721-3-2 Class 2K3 - 25... + 70 °C <95 % r.h. Class 2M2 Housing frontASA + PC, NCS S 0502-G (white) equates to RAL9010 Bottom section of housingASA + PC, NCS 2801-Y43R (grey) equates to RAL7035 BasePC, NCS 2801-Y43R (grey) equates to RAL7035 Sensor (complete assembly)Silicone-free PackagingCorrugated cardboard Product standardEN 60730-1 Automatic electrical controls for household and similar use Electromagnetic compatibility (Applications)For use in residential, commerce, light- industrial and industrial environments EU Conformity (CE)CE1T1857xx *) RCM ConformityCE1T1961en_C1 EAC ConformityEurasia Conformity UL UL 873,http://ul.com/database The product environmental declaration CE1E1961 *) contains data on environmentally compatible prod- uct design and assessments (RoHS compliance, materials composition, packaging, environmental benefit, disposal). Incl. packaging Without LCD display With LCD display Approx. 0.130 kg Approx. 0,150 kg *) The documents can be downloaded fromhttp://siemens.com/bt/download . Functional data of temperature sensor with QFA2020, QFA2040 Degree of protection Electrical connections Environmental conditions Materials and colors Standards, directives, and approvals Environmental compatibility Weight8/8 SiemensRoom sensors QFA20..CE1N1857en Building Technologies2018-03-23 Internal diagram QFA2060 QFA2060DQFA2020, QFA2040(as of series B)QFA2000 G0 U1BS G 1 8 5 7 G 0 2 r.h. MS G0 U1 G 1 8 5 7 G 0 3 r.h. QFA2001QFA2071 I1 G1 1 8 6 4 G 0 4 (r.h.) G, G0Operating voltage AC 24 V (SELV) or DC 13.5...35 V G1, G2Operating voltage DC 13.5...35 V U1Signal output DC 0...10 V for relative humidity 0...100 % U2Signal output DC 0...10 V for temperature range 0...50 °C (R2 = factory setting), - 35...+35 °C(R1) or - 40…+70 °C (R3) I1Signal output 4…20 mA for 0...100 % r.h. I2Signal output 4…20 mA for temperature range 0...50 °C (R2 = factory setting), - 35...+35 °C (R1) or - 40...+70 °C (R3) BS, MS Signal output LG-Ni 1000 or T1 (passive, simulated) for temperature range 0…50 °C; the wires must not be interchanged Note on connection terminals of theQFA2071: Terminals G1( + ) and I1( - ) of the humidity output must always be connected to power, even if only terminals G2( + ) and I2( - ) of the temperature output are used! G1( + ) and I1( - ) are galvanically isolated towards G2( + ) and I2( - ). Dimensions 90 1 0 0 36 4,2 9 , 5 5 6 6 0 56 60 1 8 5 7 M 0 1 Dimension in mm Drilling plan Issued by Siemens Switzerland Ltd. Building Technologies Division International Headquarters Theilerstrasse 1a CH-6300 Zug Tel. +41 58 724 2424 www.siemens.com/buildingtechnologies © Siemens Switzerland Ltd, 2006 Technical specifications and availability subject to change without notice.Next >