Kaidi KD 26GHz IP67 / IP65 High Frequency Radar Water Level Gauge for Rivers

PRODUCT PRINCIPLE

The antenna of the radar water gauge emits a very narrow microwave pulse. This pulse propagates in space at the speed of light and meets the surface of the measured medium. Part of its energy is reflected back and 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 measured 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 adopts a special demodulation technology, which 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 setting

B Low adjustment

C high adjustmen

The reference surface for measurement is: the bottom surface of the thread or the sealing surface of the flange

Note: When using radar water level timing, be sure to ensure that the highest water level cannot enter the measurement blind zone.

APPLICATION

The radar water level gauge recommended by the industry uses a 26GHz transmission frequency, so it has:

▲Small beam angle, concentrated energy, stronger anti-interference ability, greatly improved measurement accuracy and reliability

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

▲Lighter about 1KG, easy to install

▲The measurement range is up to 30 meters, covering large-scale reservoirs and other water level measurement

▲Multiple output circuit interfaces to cooperate with the acquisition system

▲Using pulse working mode, the transmitting power of the radar water level gauge is extremely low, and there is no harm to the human body and the environment

PRODUCT INTRODUCTION

●908S 

Application: rivers, lakes, shallows                                            

Measuring range: 0~30 meters

Process connection: gantry frame,Locking flange from  DN  80/ 3"   

Process temperature: -40～80℃

Process pressure: (-0.1～0.3) MPa

Precision: ±3mm

Frequency: 26GHz

Protection grade: IP67 / IP65

Power supply: DC (6-24V) / four wires DC 24V / two wires

Signal output: Modbus-RS485 protocol (6~24V DC) 4~20mA/Hart two wires (24V DC)

On-site display: optional

 Shell: cast aluminum / plastic

INSTALLATION

l Preparation before installation:

Ø Please pay attention to the following matters, to ensure that the instrument can be installed correctly:

Ø Please reserve enough space for installation.

Ø Please avoid installing occasions strong vibration.

l 
Illustration and installation position

 Schematic diagram of radar and stent 

Note: Radar antenna microwave pulse, have a certain emission angle. From the lower end of the antenna to be measured between the surface of the medium, and a transmitter shall be no obstruction in the region of the microwave beam radiation. Therefore, the installation should be avoided as far as possible shelter facilities, shall be carried out "false echo study" when necessary. Also note that when installing devices: the highest level measured shall enter blind; instrument must be connected to the earth, increasing the lightning protection measures; outdoor shade should be taken, rain measures.

ELECTRICAL CONNECTION

Power Supply voltage

RS485/Modbus                                      power supply and Modbus signal lines separated respectively using a shielded cable, the power supply voltage range of see technical data.

(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.

Connection mode

l The RS485/Modbus wiring diagram as follows:

l 24V two wire wiring diagram as follows:

Safety instructions

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

Protection grade

This instrument meets the protection grade IP66/67 requirements,  please ensure the waterproof cable sealing head.

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

INSTRUMENT COMMISSIONING

l There are three kinds of debugging method:

1) Display / Keyboard   

2) Host debugging   

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  

① Liquid crystal display(LCD)

② The key

l PC debugging:

Connected to PC by HART

①  RS232 interface or USB interface                      

②  Radar level meter

③ HART adapter

④  250 Ω resistor

●Connect to the host computer through the RS485 converter

① RS232 interface/or USB interface

② Radar water level gauge

③ RS485 converter

STRUCTURE SIZE

●Case size:

➪Cast aluminum case

➪Plastic case

● Product Size

● If there is a split display, the size of the water conservancy split display:

● Gantry frame size

TECHNICAL PARAMETERS

Shell/material cast                                aluminum, plastic, stainless steel

Seal between Shell  and Shell cover Silicone rubberShell window       polycarbonate

Ground terminal                                        stainless steel

The power supply voltage

Four-wire system    (6～24) V DC / Modbus-RS485 / power consumption 90mW

Two-wire system    DC 24V / 4~20mA / power consumption 0.75W

Allowable ripple-     <100Hz      Uss

                    -(100～100K)   Hz Uss

The cable parameters

Cable entrance / plug                 1  M20xl.5 cable entrance

erminal                               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 measurement                  30 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                    (-40～80) ℃

Process temperature (the temperature of the antenna part)         (-40～80)℃  

Pressure                                     Max. 4MPa

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

METER LINEARITY

The launch angle depends on the antenna size

-￠76mm         12°

Accuracy see the figure below

PRODUCT MODEL SELECTION

l 908S 

License  

P    Standard (Non-explosion-proof)

                      Process Connection / Material

N gantry frame

             M PP flange installation

             Y special customization                              

                                       Seal Up / Process Temperature

V   Viton / (-40~80) ℃

The  Electronic Unit

V RS485-Modbus / four-wire system

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

                                        Outer Covering / Protection  Grade  

L aluminum/IP67

G plastic /IP65

Cable Line

M    M 20x1.5

N   ½″ NPT

                                  Field Display/The Programmer

A   With                 

X   Without