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Kaidi KD-902F High Frequency Radar Level Transmitter Wave Radar Solid Level Sensor Guided Radar Signal Level Meter

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Kaidi KD-902F High Frequency Radar Level Transmitter Wave Radar Solid Level Sensor Guided Radar Signal Level Meter
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Application:
Liquid
Measuring Range:
0~20 meters
Accuracy:
±5mm
Frequency:
26GHz
Process Pressure:
(-0.1~0.3) MPa
Process Temperature:
-40~80℃
Process Connection:
gantry frame,flange
Explosion proof certification:
Exia ⅱ C T6 Ga
Outer Covering:
Aluminum / Plastic / Stainless steel
Power supply
two-wire system (DC24V) Four wire system (DC24V/AC220V)
Signal output
4... 20mA/HART(twowires/fourwires) / Mod bus-RS485
MOQ
1 SET
Payments:
TT, Paypal, Credit card, Western union
Shipping ways:
Express(DHL,Fedex,TNT,EMS,UPS)/Air/Sea
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1.  Product  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

     




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 

902F


Application: liquid

Measuring range: 0~20 meters

Process connection: gantry frame,flange

Process temperature: -40~80℃

Process pressure: (-0.1~0.3) MPa

Precision: ±5mm

Frequency: 26GHz

Field display: four - digit LCD programmable

Power source: two-wire system (DC24V)

                        Four wire system (DC24V/AC220V)

Explosion-proof grade: Exia ⅱ C T6 Ga

                                     Exd ⅱ C T6 Gb

Shell: Aluminum / Plastic / Stainless steel

Signal output: 4... 20mA/HART(twowires/fourwires)

/ Mod bus-RS485


3. The  Installation Requirements

 Installation Precautions:

Please pay attention to the following items to ensure that the meter can be installed correctly:

Please reserve enough space for installation.

Please avoid installation situations with strong vibration.


Dragon door frame installation


Flange installation

  • Gauges are installed at 1/4 or 1/6 of the diameter of the tank.

  • The minimum distance from the pipe wall is 200 mm.

  • Avoid installation in the center of the tank.



Typical installation errors

Ø Conical tank

The instrument cannot be installed above the inlet. 

Note: Sun-shading and rain-proof measures should be taken during outdoor installation..                      

         ①Correct  ②Error  rainproof measures

           

Ø The meter cannot be installed in the middle of the top of an arched or round tank. In addition to producing indirect echoes, it will also be affected by multiple echoes. Multiple echoes may be larger than the signal threshold of true echoes, because multiple echoes can be concentrated through the top, so they cannot be installed in the center.

                                                                                                                                        ①Correct                         ②Error

                      

Ø When there are obstacles in the tank that affect the measurement, it is necessary to install a reflector to measure normally

                                                                                                                         ①Correct                                       ②Error


  • Container takeover requirement

Make sure that the antenna extends into the tank at least 10mm away.

              

4. The Electrical Connection  

  • The power supply voltage:

(4~20)mA/HART (Two wire system)

The power supply and the output current signal sharing a two core shield cable. The supply voltage range see technical data. For intrinsically safe type must be a safety barrier between the power supply and the instrument.

(4~20)mA/HART(Four wire system)

Separate power supply and the current signal, respectively using a two-core shielded cable. The supply voltage range see technical data

RS485 / Modbus(Four wire system)

Power supply and Modbus signal line separated respectively using a two-core shielded cable, the power supply voltage range see technical data.


  • Cable Connection

General Introduction 

Supply cable can use ordinary two-core cable,  the cable diameter should be (6~12) mm, to ensure that the cable entry seal. If electromagnetic interference exists, recommended to use shielded cable.

 (4~20) mA(4-wire / 6-wire)

The power supply needs to be powered separately. The power supply and current signals use a four-core shielded cable (current signal and RS485 interface can be output simultaneously, and a six-core shielded cable is required for output)

Modbus-RS485

The power supply needs to be powered separately. The power supply and digital use a four-core shielded cable (current signal and RS485 interface can be output simultaneously, and a six-core shielded cable is required for output).

  • Connection  mode

Ø  The Modbus-RS485 wiring diagram as follows:

 Ø 24V  2-wire wiring diagram 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 meets the protection class IP66/67 requirements, please ensure the waterproof cable sealing head. The following diagram:

     How to install to meet the requirements of IP67:

     Please make sure that the sealing head is not damaged.

     Please make sure that the cable is not damaged.

     Please make sure that the cable for use with electrical connection specification.

     Cable into the electrical interface before its curved downward, ensure that the water will not flow into the shell, see the①

     Tighten the cable seal head, see the②

     Please electrical interface will not use blind plug tight, see the③





5. Instrument Commissioning

There are two kinds of debugging method:

1) Display / Button (With split display, you need to debug on the split)

2) Debug through computer software 

  

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

                                                                                   ① USB interface   ②  Radar level meter    ③  HART converter    ④  250 Ω Resistor

        

 HART  handheld  programmer:

                                                                                   ① HART handheld programmer    ②  Radar level meter    ③  250 Ω Resistor

       

6. Structure Size   (Unit: mm)

The Outer Covering:

Cast aluminum shell

 

Plastic shell

Product  size:

 

Gantry frame size:

Flange  type:

7. Technical Parameters

Process connection/antenna profile

flange / 304 stainless steel

Dragon door frame/stainless steel, carbon steel

Liquid materia

 l PTFE

The outer shell material

Cast aluminum, plastic, stainless steel

The seal between the shell and the shell cover 

Silicone rubber

Casing window 

Polycarbonate

The ground termina

Stainless steel

The power supply voltage

Four wire system

 (6~24) V DC(Modbus-RS485) /   198~242VAC(Double cavity and isolation)/110VAC (Double cavity and isolation)

Two wire system

 DC 24V

Allowable ripple


- <100Hz                                  Uss<lV  

- (100~100K) Hz                     Uss<l0mV


The cable parameters


Cable entrance / plug

1  M20xl.5 cable entrance

Terminal

Conductor cross section 1.0mm² 


Output parameters


The output signal

 Modbus-RS485 / 4~20mA

Communication protocol

Modbus / HART

Resolution 

1.6μA

Fault signal

Constant current output; 20. 5mA;22mA;3.9mA

The integral time 

(0 ~ 36) s, adjustable

Blind area

the ends of the antenna

The maximum distance measuremen

20 meters

Microwave frequency

26GHz

The measurement interval

about 1 second (depending on the parameter settings)

Adjust the time

about 1 second (depending on the parameter settings)

Display resolution

1 mm

Working storage and transportation temperature

 (-4080) 

Process temperature (the temperature of the antenna part)

(-40~80) ℃

Pressure

 Normal atmospheric pressure

Seismi

Vibration frequency (10~150) Hz,

maximum vibration acceleration l0m/s²


8.   Meter  Linearity

902F

The launch angle depends on the antenna size

-Φ76mm                        12°

Precision                      See chart

9. Product  Model  Selection

902F

License

       P    Standard (Non-explosion-proof)

        I     Intrinsically safe (Exia ⅡC T6 Ga)

        D    Flameproof (Exd ⅡC T6 Gb) 

Process Connection Material

                                        A gantry frame

                                        B DN80 flange/ Stainless Steel 304

                                        C DN100 flange/ Stainless Steel 304

                                        D DN125 flange/ Stainless Steel 304

                                        E DN150 flange/ Stainless Steel 304

                                        F DN80 flange/ PP

                                        G DN100 flange/ PP

                                        H DN80 flange/ PP

                                         I  DN100 flange/ PP

                                        G Special Custom

Antenna Type / Material

    A 78mm plastic sealed antenna

                                             Seal Up / Process Temperature

 V Ordinary seal/(-40~80) ℃

The  Electronic Unit

V Modbus-RS485 / 6~24V DC four-wire system

W (4~20) mA / 24V DC two-wire system   

   X  (4~20) mA / 220V AC four-wire system

Cable Line

M    M 20x1.5

N   ½″ NPT

Field Display/The Programmer

A   With

                                                                   X   Without



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