QFA31 SIEMENS | Alldatasheet
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2016-07-21 Building Technologies 858 Symaro™ Room sensors QFA31.. for relative humidity (high accuracy) and temperature x Operating voltage AC 24 V / DC 13.5...35 V x Signal output DC 0...10 V / 4…20 mA for relative humidity and temperature x Very high measuring accuracy across the entire measuring range x Capacitive humidity measurement x Function test x Range of use 40… 70 °C / 0…100 % r. h. with LCD display 25…+70 °C / 0…100 % r. h. Use The QFA31.. is for use in ventilation and air conditioning plants where high accuracy and short response times for measuring relative humidity are required. The measuring range covers the entire humidity range of 0…100 %. Examples: x Storage and production facilities in the paper, textile, pharmaceutical, food, chemical and electronics industry, etc. x Laboratories x Hospitals x Indoor swimming-pools x Computer and EDP centers x Greenhouses x With the AQF3100 accessory for outdoor use 1858P01 1858P02 1859P02 1859P04
Siemens Room sensors QFA31.. CE1N1858en Building Technologies 2016-07-21 Type summary Type reference Temperature measuring range Temperature signal output Humidity measuring range Humidity signal output Operating voltage Measured value dis- play DC 13,5…35 V No QFA3101 None None 0...100 % active, 4…20 mA DC 13,5…35 V No / 35...3 5 °C DC 13,5…35 V No / 35...3 5 °C DC 13,5…35 V Yes / 35...3 5 °C active, 4…20 mA 0...100 % active, 4…20 mA DC 13,5…35 V No / 35...3 5 °C active, 4…20 mA 0...100 % active, 4…20 mA DC 13,5…35 V Yes Ordering and delivery When ordering, please give name and type reference, e.g.: Room sensorQFA3160 The outdoor mounting kit AQF3100, and the service set AQF3153 listed under “Acces- sories“ must be ordered as a separate item. Equipment combinations All systems and devices capable of acquiring and handling the sensor’s DC 0...10 V or 4...20 mA 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). Technical design The sensor acquires the relative humidity in the room or in the outer air, respectively, via its capacitive sensing element whose capacitance varies as a function of the rela- tive humidity of the ambient air. An electronic circuit converts the sensor’s signal to a continuous DC 0...10 V or 4…20 mA signal, corresponding to a relative humidity of 0...100 %. The sensor acquires the temperature in the room or in the outer air, respectively, via its sensing element whose electrical resistance changes as a function of the temperature. This variation is converted to an active DC 0…10 V or 4…20 mA output signal, depend- ing on the type of sensor. The output signal corresponds to a selectable temperature range of 0…50 °C, –35…+35 °C, or 40...70 °C. Output signal, terminaI I1 / I2 0 10 20 30 40 700 400 300 800 900 600 500 100 200 Burden [Ohm] [DC V]Operating voltage Admissible range Inadmissible range! 1858D02en Relative humidity Temperature Burden diagram
Siemens Room sensors QFA31.. CE1N1858en Building Technologies 2016-07-21 Mechanical design The room sensor consists of a housing, a printed circuit board, connection terminals and a measuring tip. The two-part housing comprises a base and a screwed removable cover. A rubber seal is installed between base and cover in order to satisfy the requirements of IP 65 degree of protection. The measuring circuit and the setting element are accommodated on the printed circuit board inside the cover, the connection terminals in the base. Housing and measuring tip are screwed together. The measuring tip features a degree of protection of IP40. The sensing elements are located at the end of the measuring tip, protected by a screw-on filter cap. Cable entry is made via the cable entry gland M16 supplied with the sensor, which screws into the housing. If the sensor is used outdoors, that opening must be closed off and the prepared hole on the opposite side of the base knocked out. The types QFA3160D and QFA3171D provide 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. 123 123 Range 5 V 10 V 5 V 0 V 10 V 5 V 0 V 5 V U1 U2 I1 I2 20 mA 12 mA 4 mA 12 mA 12 mA 20 mA 12 mA 4 mA°F °C °F °C QFA31...D Measuring range Test function active 1858Z03en Display temperature unit The setting elements are located inside the cover. 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: x For the active temperature measuring range: Jumper in the left position (R1) =35...35 °C, Jumper in the middle position (R2) = 0...50 °C (factory setting) Jumper in the right position (R3) =40...+70 °C x For the active test function: Jumper in the horizontal position: The values available at the signal output are those given in the table “Test function active“. x For the measured value display (QFA31..D) - Jumper vertical in the right position = °C (factory setting) - Jumper vertical in the left position = °F x Should the temperature sensor become faulty a voltage of 0 V (4 mA) will be applied at signal output U2 (I2) after 60 seconds, and the humidity signal at signal output U1 (I1) will reach 10 V (20 mA). x 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 active. Room sensor QFA31.. Measured value display Setting elements Malfunction
Siemens Room sensors QFA31.. CE1N1858en Building Technologies 2016-07-21 The outdoor mounting kit consists of: x 1 wall mounting bracket complete with radiation shield x 4 Phillips-head screws K35 x 12 x 1 grommet M 16 x 1.5 with O-ring and nut M 16 x 1.5 for closing off the sensor’s ca- ble entry hole if not required The service set comprises three measuring tips without sensor element. Each tip sig- nals a predefined temperature and humidity value to the basic unit: x 20 % r. h., 5 °C The fixed values are available at the signal outputs. The accuracy is the same as for the test function. The measuring tips can be exchanged in operation. Accessories Name Type reference Outdoor mounting kit (incl. radiation shield) AQF3100 Filter cap (for replacement) AQF3101 Measuring tip (exchangeable for replacement) AQF3150 Service set (for function test) AQF3153 3 m cable for remote measurement AQY2010 Engineering notes A transformer for safety extra low-voltage (SELV) with separate windings for 100 % duty is required to power the sensor. All safety regulations valid at the location of the plant must be complied with when sizing and protecting the transformer. When sizing the transformer, the sensor’s power consumption must be taken into con- sideration. For the electrical connection of the sensor, refer to the Data Sheets of the devices with which the sensor is used. The maximum permissible cable lengths must be considered. It must be considered for routing of cables that electrical interference is the greater, the longer the cables run side by side and the smaller the distance between them. Use shielded cables in environments having EMC problems. Twisted pairs of cables are required for the secondary supply lines and the signal lines. Terminals G1() and I1() for the humidity output must always be connected to power, even if only terminals G2() and I2() of the temperature output are used! Mounting notes QFA31.. without AQF3100 Inside wall (not on outside wall!) of the room to be air conditioned; not in recesses, be- hind curtains, above or close to heat sources or shelves; not on walls behind which a chimney is located. The sensor must not be exposed to 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. x The seal between base and cover must not be removed, or else degree of protection IP65 will be no longer ensured. x The sensing elements inside the measuring tip are sensitive to shock and impact. Avoid any such impact on mounting. Outdoor mounting kit AQF3100 Service set AQF3153 Cable routing and cable selection Note to QFA3171(D) Interior mounting Mounting location Caution!
Siemens Room sensors QFA31.. CE1N1858en Building Technologies 2016-07-21 Without using the AQF3100 outdoor mounting kit, the sensor must not be mounted with the measuring tip pointing upward. Mounting Instructions are printed on the inner side of the package. QFA31.. with AQF3100 Exterior wall, preferably on the North or Northwestern side of the building; if possible in the middle of the wall, at least 2.5 above the ground. Not above or below windows, above doors and ventilation shafts, below balconies or eaves. The sensor with AQF3100 must be mounted in a vertical position (radiation shield at the top). Mounting Instructions are enclosed with the AQF3100. When using the AQF3100 outdoor mounting kit, the sensor’s cable entry hole must be closed off with the grommet and the prepared M16 cable entry on the opposite side knocked out. Commissioning notes Prior to switching on power, check wiring. On the sensor, select the required temperature measuring range. 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. x Dispose of the device via the channels provided for this purpose. x Comply with all local and currently applicable laws and regulations. Mounting position Mounting Instructions Outdoor mounting Mounting location Mounting position Mounting Instructions Note
Siemens Room sensors QFA31.. CE1N1858en Building Technologies 2016-07-21 Technical data Operating voltage AC 24 V r20 % or DC13,5…35 V (SELV) or AC/DC 24 V class 2 (US) Frequency 50 /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 d1 VA Max. perm. cable lengths refer to Data Sheet of the device han dling the signal Measuring accuracy at 23 °C and AC/DC 24 V in Temperature dependency d0.05 % r . h./°C Time constant < 20 s max. 1 mA Output signal, linear (terminal I1) Burden refer to "Function" Measuring range 0...50 °C (R2 = factory setting), Sensing element Pt 1000 Measuring accuracy at AC/DC 24 V in 23 °C 15...35 °C 35...+70 °C r0.3 K r0.6 K r0.8 K Time constant 8.5 min. (according to airflow and wall coupling) max. 1 mA Output signal, linear (terminal I2) Burden refer to "Function" Protection degree of housing Base unit Measuring tip Unit with outdoor mounting kit EN 60529 IP65 IP40 IP65 Protection class III according to EN 60730-1 Screw terminals 1 u 2.5 mm2 or 2 u 1.5 mm2 Cable entry gland (enclosed) M 16 x 1.5 Operation to Climatic conditions Temperature (housing with electronics) LCD-display readable Humidity Mechanical conditions Class 4K2 to IEC 60 721-3-4 40...70 °C 25...70 °C Class 3M2 to IEC 60 721-3-3 Transport to Climatic condition Temperature Humidity Mechanical conditions IEC 60 721-3-2 Class 2K3 40...70 °C <95 % r.h. class 2M2 Power supply Cable lengths for the measuring signal Functional data “Humidity sensor" Functional data "Temperature sensor" Degree of protection Electrical connections Environmental conditions
Siemens Room sensors QFA31.. CE1N1858en Building Technologies 2016-07-21 Base polycarbonate, RAL 7001 (silver-grey) Housing cover polycarbonate, RAL 7035 (light-grey) Measuring tip polycarbonate, RAL 7001 (silver-grey) Filter cap polycarbonate, RAL 7001 (silver-grey) Mounting bracket PA, RAL 7035 (light-grey) Sensor (entirely) silicon-free Packaging corrugated cardboard Product standard EN 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) CE1T1858xx *) RCM Konformität 8000078879 *) UL UL 873, http://ul.com/database The product environmental declaration CE1E1858 *) contains data on environmentally compatible prod- uct design and assessments (RoHS compliance, materials composition, packaging, environmental ben- efit, disposal) Incl. packaging Without LCD-display With LCD-display AQF3150 AQF3153 0.152 kg 0.175 kg 0.050 kg 0.066 kg *) The documents can be downloaded from http://siemens.com/bt/download. Connection terminals QFA3100 QFA3101 QFA3160(D) QFA3171(D) G0 U1 G 1858G04 (r.h.) 1858G05 (r.h.) G0 U1 U2 G 1858G01 (r.h.) (R1 = 35...35 °C / R2 = 0...50 °C / R3 = ...+70 °C) I1 I2 1858G03 (r.h.) (R1 = 35...35 °C / R2 = 0...50 °C / R3 = ...70 °C) G, G0 Operating voltage AC 24 V (SELV) or DC 13.5...35 V G1, G2 Operating voltage DC 13.5...35 V I1 Signal output 4…20 mA for relative humidity 0...100 % I2 Signal output 4…20 mA for temperature range 0...50 °C (R2 = factory setting) Note on connection terminals of the QFA3171(D) : Terminals G1() and I1 () for the humidity output must always be connected to power, even if only the tem- perature output G2 () and I2 () is used! Materials and color Standards and Directives Environmental compatibility Weight
Siemens Room sensors QFA31.. CE1N1858en Building Technologies 2016-07-21 Dimensions(all dimensions in mm) (41 with display) 80 39 84 60 10,5 ø 15 14,5 1858M01 62,8 M 16 x 1,5 Bohrplan AQF3150 M 16 x 1,5 104 30 135 4940 10,7 5,3 1858M02 193 Drilling plan QFA31..(D) Dimensioning without (with) LCD-display QFA31.. with AQF3100 Published by: Siemens Switzerland Ltd. Building Technologies Division International Headquarters Gubelstrasse 22
6301 Zug
Tel. +41 41-724 24 24 www.siemens.com/buildingtechnologies © Siemens Switzerland Ltd 2008 Delivery and technical specifications subject to change