Direct Radiometer

AUTOMATIC TRACKING DIRECT RADIATION INSTRUMENT

TBS-2C

MANUAL

OVERVIEW：

To measures the radiation which is vertical solar surface (angle of view about 0.5 °) and the scattered radiation from a very narrow ring-shaped sky around the sun,it is called direct solar radiation and it is measured with a direct radiation instrument.

PRINCIPLE & STRUCTURAL CHARACTERISTICS

It is mainly composed of a light tube and an automatic tracking device. The inside of the light tube is composed of seven light bars, an inner tube, a thermopile, and a desiccant tube. Seven light bars are used to reduce internal reflections, form the opening angle of the instrument, and limit the turbulence of air inside the instrument. On the outside of the light barrier is an inner tube, which seals the dry air inside the light barrier and the outer tube to reduce the impact of ambient temperature on the thermopile. A JGS3 quartz glass plate is installed in the outer cylinder mouth, which can transmit radiation light with a wavelength of 0.27-3.2µm, which is convenient for direct solar radiation measurement. A desiccant is installed in the cylinder to prevent the formation of moisture condensation.

The inductive part of the direct radiation meter is the core part of the light tube, which is composed of a fast-responding wire-wound electroplating thermopile. The side of the induction part facing the sun is coated with matte black paint. Below is the thermal contact of the thermopile. When sunlight hits the thermal contact, the temperature rises. It forms a temperature difference with the cold contact on the other side, which generates an electromotive force. The electromotive force It is directly proportional to the intensity of direct solar radiation.

The automatic tracking device is composed of a base plate, a latitude dial, a stepping motor, a conductive ring, and a turbine box (for adjusting the sun's inclination). The stepping motor is the power source, and it can only be controlled and operated by the "Straight Table Controller" produced by our company (do not twist the automatic tracking device by hand). The tracking device has high accuracy, and the rotation angle error is within 0.25 ° within one week, that is, less than 1 minute. As long as it is installed correctly, accurate automatic tracking can be achieved.

TECHNICAL SPECIFICATION

1. Sensitivity: 7 ～ 14μV ∕ W.m^-2

2. Time constant: ≤15S (99%)

3. Internal resistance: about 80 ohms

4. Tracking accuracy: <168h ± 1 °

5. Opening angle: 4 °

6. Annual stability: ± 1% (sensitivity change rate)

7. Working environment: -45 ℃ ～ + 45 ℃

8. Power supply: AC220V or DC12V

9. Weight: 5Kg

10. Measuring range: 0 ～ 2000W / m²

11. Signal output: 0 ～ 20mV (4 ～ 20mA can be output with DL-2 standard current transmitter)

12. Measurement accuracy: working table <5%; standard table <2%

1. Horizontal bubble

2.Horizontal adjustment button

3.Pointer

4.Connect the socket to the collector

5.Time scale

6.Declination scale

7.Desiccant cartridge

8.Light tube

9.Connecting bolt

10.Latitude dial

11.Latitude adjustment button

12.Floor

13.Sun tilt adjustment button

14.Time Baseline

15.light hole

16.light spot

Wiring Instructions: