LCD High Frequency Pulse 26GHz Radar Level Meter with RS485 Modbus For Various Liquid or Water Level Measuring

Item No.: 00244
This series of radar level meter adopted 26GHz high frequency radar sensor, the maximum measurement range can reach up to 70 meters.
Description Wiring and Debugging How to Order ? Review


This series of radar level meter adopted 26GHz high frequency radar sensor, the maximum measurement range can reach up to 70 meters. Antenna is optimized further processing, the new fast microprocessors have higher speed and efficiency can be done signal analysis, the instrumentation can be used for reactor, solid silo and very complex measurement environment.



Radar level transmitter antenna microwave pulse is narrow, the downward transmission antenna. Microwave exposure to the medium surface is reflected back again by the antenna system receives, sends the signal to the electronic circuit automatically converted into level signals (because the microwave propagation speed, electromagnetic wave to reach the target and the reflected back to the receiver this time is almost instantaneous).



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).




l  The characteristics of 26G radar level meter:

Ø  Small antenna size, easy to install; Non-contact radar, no wear, no pollution.

Ø  Almost no corrosion, bubble effect; almost not affected by water vapor in the atmosphere, the temperature and pressure changes.

Ø  Serious dust environment on the high level meter work has little effect.

Ø  A shorter wavelength, the reflection of solid surface inclination is better.

Ø  Beam angle is small, the energy is concentrated, can enhance the ability of echo and to avoid interference.

Ø  The measuring range is smaller, for a measurement will yield good results.

Ø  High signal-to-noise ratio, the level fluctuation state can obtain better performance.

Ø  High frequency, measurement of solid and low dielectric constant of the best choice.





1.   Technical Parameters



The outer shell 

The seal between the shell and the shell cover                 Silicone rubber

Casing window                                                                   Polycarbonate

The ground terminal                                                           Stainless steel


The power supply voltage

Two wire system             

 The standard type                   (16 ~ 26) V DC

Intrinsically safe                      (21.6 ~ 26.4) V DC  

Power dissipation                   max 22.5mA / 1W                                            Allowable ripple

- <100Hz                                  Uss100K) Hz                     Uss


The cable parameters

Cable entrance / plug           One M20xl.5 cable entrance

                                             One blind plug

Terminal                               Conductor cross section 1.0mm² 


Output parameters

The output signal                              (4 ~ 20) mA/RS485

Communication protocol                   HART

Resolution                                        1.6u A

Fault signal                                       Constant current output; 20. 5mA



The integral time                               (0 ~ 50) s, adjustable


Blind area                                 the ends of the antenna


The maximum distance measurement                  70 meters


Microwave frequency                                              26GHz


Communication interface                                       HART communication protocol


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                          (-40100) 

Process temperature (the temperature of the antenna part)             (-40250)

Pressure                                     Max.4MPa

Seismic                                       Mechanical vibration l0m/s², (10 ~ 150) Hz






2.  Installation guide:


lBe installed in the diameter of the 1/4 or 1/6.   Note: the distance between the tank wall minimum distance should be tank high 1/10.




l  The top conical tank level, can be installed at

the top of the tank is intermediate, can guarantee the measurement to the conical bottom




A feed antenna to the vertical alignment surface. 

If the surface is rough, stack angle must be used to adjust the angle of cardan flange of the antenna

to the alignment surface.

(Due to the solid surface tilt will cause the echo attenuation, even Loss of signal.)



l  Typical installation errors

Ø  Conical tank cannot be installed above the feed port.

Note: outdoor installation should adopt sunshade.


②  rainproof measures




Ø The instrument cannot be installed in the arched or domed roof intermediate. In addition to produce indirect echo is also affected by the echoes. Multiple echo can be larger than the real value of signal echo, because through the top can concentrate multiple echo. So cannot be installed in a central location.


       ②      Error





Ø There are obstacles affecting measurement needed reflection plate


       ②    Error







Height of nozzle:

Antenna extends into the tank at least 10mm distance.










3.   The Electrical Connection   

l  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 power cable. The supply voltage range see technical data.


RS485 / Modbus                     Power supply and Modbus signal line separate drespectively using a shielded cable, the power supply voltage range see technical data.









4.  Connection  mode:



24V two wire wiring diagram as follows:


220V four wire connection is as below:





Ø  24V RS485/Modbus wiring diagram as follows:





5.  Safety instructions:

Please observe the local electrical code requirements!

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.


Please check the instrument nameplate to provide product specifications meet your requirements.

Please make sure that the power

Wiring and Debugging

6.  Instrument Commissioning

 There are three kinds of debugging method:

1)     Display / Keyboard  

2)     Host debugging  

3)     HART handheld programmer 


l  Display / Keyboard:

Please debug the instrumentation by four buttons on the display screen. There are three debug menu languages optional. After debugging is generally used only for display, through the glass window can read measured value very clearly 


Display / Keyboard  

 Liquid crystal display(LCD)

 The key



PC debugging:

Connected to PC by HART

  RS232 interface or USB interface                     

  Radar level meter

 HART adapter

  250 Ω resistor

HART  handheld  programmer:

 HART handheld programmer

  Radar level meter


  250 Ω resistor



7.   Structure Size (Unit: mm)


l  The outer shell:

How to Order ?


 8. The basic detail before your place order:





 9. Easy Model Selection Table:






10. Product Detail Photos:














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