Kaidi KD-908F Rivers, lakes, shoals Cost-Effective High Frequency Radar Level Meter High Quality Silo Radar Level Meter

1.  Product  Overview

Principle

The radar water level antenna emits extremely narrow microwave pulses that travel at the speed of light, and part of the energy is reflected back when it encounters the surface of the measured medium and is received by the same antenna. The time interval between the transmitted pulse and the received pulse is proportional to the distance from the antenna to the surface of the measuring medium. Due to the extremely high propagation speed of electromagnetic waves, the time interval between the transmitted pulse and the received pulse is very small (nanosecond order) and it is difficult to confirm. The high-frequency radar water level gauge uses a special demodulation technology that can accurately identify the transmitted pulse and the received pulse The distance between the antenna and the surface of the measured medium can be further calculated.

A    Range set B    Low adjustment C    High adjustment D    Blind area

Datum measurement:  Screw thread bottom or the sealing surface of the flange.

Note: Make sure the radar level meter the highest level cannot enter the measuring blind area (Figure D shown below).

Application characteristics

The radar water level gauge uses a 26GHz transmitting frequency and has:

Ø Small beam angle, concentrated energy, stronger anti-interference ability, greatly improved measurement accuracy

Ø The antenna is small in size, easy to install, and easy to add dust cover and other antenna protection devices

Ø Lighter weight, about 1KG, easy to install

Ø The maximum measurement range can reach 70 meters, which can cover water level measurement such as large reservoirs

Ø With a variety of output circuit interface and data acquisition system.

Ø The pulse working mode, radar level meter transmit power is very low, no harm to human body and environment.

2. Product  Introduction 

908F

3. The  Installation Requirements

 Installation Precautions:

The 908F is generally used for installation in water wells, mainly connected by a gantry frame or locking flange. Connected with a gantry frame, it can be installed on the side wall and top of the water well; When installed on the top, lifting is also used, as shown in the following figure.

Precautions during installation:

4. The Electrical Connection  

• The power supply voltage:

• Connection method

The 24VDC two wire system wiring diagram is as follows:

The 6-24VDC four wire system wiring diagram is as follows:

 Safety  instructions:

Ø Please observe the local electrical code requirements!

Ø Please comply with local requirements for personnel health and safety regulations.

    All electrical components of instrument operation must be completed by the formal training of professionals.

Ø Please check the instrument nameplate to provide product specifications meet your requirements. Please make sure that the power supply voltage and instrument nameplate on the requirements.

 Protection  grade:

This instrument fully meets the requirements of protection level IP68, please ensure the waterproofing of the cable sealing head. As shown below:

5. Instrument Commissioning

There are three kinds of debugging method:

① Split display/buttons (if equipped with split display, debugging needs to be carried out on the split, and the connection method is shown in the attached connection diagram)

② Upper computer software debugging

③ HART handheld programmer (4-20mA output)

Display / Button: 

Debug the meter through the 4 buttons on the display screen. The debugging menu has four languages to choose from. The measured value can be read very clearly through the glass window.

Display / Button    

                                                                                                    ① Liquid crystal display(LCD)   ② Adjust by button

 PC software debugging:

Connected to PC by HART

①RS232 interface/USB interface      ②  Radar level meter    ③ HART converter    ④  250Ω resistor

 Connected to PC by RS485

①RS232 interface/USB interface     ②Radar level meter     ③RS485 converter

Programming of a HART handheld programmer

① HART handheld programmer   ② Radar water level gauge   ③250 Ω resistor

6. Structure Size   (Unit: mm) 

Product  size:

Gantry frame size:

7. Technical Parameters

8.   Meter  Linearity

908F

The launch angle depends on the antenna size

-￠76mm                          12°

Precision                          See chart

9. Product  Model  Selection

908F