เซนเซอร์วัดอุณหภูมิห้องพร้อมจอแสดงผล Room Temperature Sensor with Display

Room Temperature Sensors

- Active sensors for acquiring the room temperature
- Operating voltage AC 24 V or DC 13.5...35 V
- Signal output DC 0...10 V or 4...20 mA

Use
In heating, ventilation and air conditioning plants for acquiring the room temperature.

Type summary
QAA2061 0...50 ๐C AC 24 V+-20% / DC 13.5....35 V DC 0...10 V
QAA2061D 0...50 ๐C AC 24 V +-20% / DC 13.5...35 V DC 0...10 V
QAA2071 0...50 ๐C DC 13.5...35 V 4...20 mA

Equipment combinations
All systems or devices capable of acquiring and handling the sensor's DC 0...10 V or 4...20 mA output signal.

Function
The sensor acquires the room temperature via its sensing element whose resistance value changes as a function of the temperature.
This change is converted to a DC 0...10 V or 4...20 mA output signal, depending on the type of sensor. The output signal corresponds to the selected temperature range.

Mechanical design
QAA20..1  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 element and the setting element are located on the printed circuit board inside the casing.

The baseplate carries the connecting terminals.

QAA2061D  Mechanical design is similar to QAA20.1...with additional LC-Display.Display of room temperature in ๐C or ๐F

Setting element
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 active temperature measuing range:
  Shorting plug in the upper position (R1) = -35...+35 ๐C
  Shorting plug in the mid position (R2) = 0...50 ๐C (factory setting)
  Shorting plug in the lower position (R3) = -50...+50 ๐C
- 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.

Fault
In the event of fault, the output signal will reach 0 V (4mA) after 60 seconds.

Disposal
The major plastic components bear the material references in compliance with ISO / DIS 11469 to facilitate environment-friendly disposal.

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 eletrically protecting the transformer, local safety regulations must be observed.

When sizing the transformer, the power consumption of the room temperature sensor must be taken into consideration. For correct wiring, refer to the Data Sheets of the devices with which the sensor is used.

The permissible cable lengths must be observed.

Cable routing and cable selection
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.
Twisted pair cables are required for the secondary supply lines and the signal lines.

Technical data
Power supply
Operating voltage: refer to "Type summary"
Frequency: 50/60 Hz at AC 24 V
Power consumption: <=1 VA

Line lengths for measuring signal
Perm. cable lengths
- Copper cable 0.6 mm dia.: 50m
- Copper cable 1 mm2: 150m
- Copper cable 1.5 mm2: 300m

Functional data
Measuring range: 0...50 ๐C (R2 = factory setting),
                         -35...+35 ๐C (R1),
                        -50...+50 ๐C (R3)
Sensing element: Pt 1000
Time constant: approx. 7 min
Measuring accuracy at AC 24 V in the range of
* -25...+25 ๐C +-0.75 K
* -50...+50 ๐C +-0.9 K
Output signal, linear (terminal U1): DC 0...10 V 0...50 ๐C or
                                                   -35...+35 ๐C or -50...+50 ๐C max.+-1 mA
Output signal, linear (terminal l1): 4...20 ma 0...50 ๐C or
                                               -35...+35 ๐C or -50...+50 ๐C
Burden: refer to "Function"

Protective data
Degree of protection of housing: IP 30 to IEC 60529
Safety class: lll to EN 60 730

Electrical connections
Connection terminals for: 1 x 2.5 mm2 or 2 x 1.5 mm2

Weight
Incl. packaging: 0.13 kg
Without LCD display: Approx. 0.130 kg
With LCD display: Approx. 0.150 kg