kaidi KD-902 26G Radar Level Meter Chemical Industry

PRODUCT OVERVIEW

KD-90X series sensors are 26G high frequency radar type level measuring instruments with measuring distance up to 80 meters. The antenna is further optimized and the new fast microprocessor allows for higher speed signal analysis and processing, making the meter available for measurement of a variety of highly corrosive liquids.

THE PRODUCT PRINCIPLE

The radar level antenna emits narrow microwave pulses, which are transmitted downward by the antenna. Microwave contact with the measured medium surface is reflected back again by the antenna system, the signal will be transmitted to the electronic circuit part automatically converted into a level signal (because the microwave propagation speed is very fast, electromagnetic waves to reach the target and return to the receiver by the reflection of the time used in this round trip is almost instantaneous).

                                                                                                                                                 A: range setting, B: low level adjustment, C: high level adjustment, D: blind range

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

Note: When using the radar level meter, make sure that the highest material level cannot enter the measurement blind zone (the area shown in D in the figure).

PRODUCT FEATURES

● Small antenna size for easy installation; non-contact radar, no wear and tear, no contamination.

● Virtually unaffected by corrosion, foam; virtually unaffected by water vapor, temperature and

 pressure changes in the atmosphere.

● Severe dusty environment has little effect on the work of high frequency level meter.

● Shorter wavelength, better reflection on inclined solid surfaces.

● Smaller beam angle and concentrated energy, which enhances the return capability and helps to 

avoid interfering objects at the same time.

● Smaller measurement blind spot, and good results for small tank measurements.

● High signal-to-noise ratio for better performance even under fluctuating conditions.

● High frequency, a better choice for measuring solids and low dielectric constant media.

PRODUCT SPECIFICATION

Applications: temperature and pressure resistant, slightly corrosive liquids

Measuring range: 30 meters

Process connection: thread, flange

Process temperature：-40～130℃( standard type ) / -40～250℃( high temperature type )

Process pressure: -0.1～4.0MPa

Accuracy：±3mm

Protection grade: IP67

Frequency range: 26GHz

Power supply: two-wire system (DC24V) / four-wire system (DC24V/AC220V )

Explosion-proof grade: Exia ⅡC T6 Ga / Exd IIC T6 Gb

Housing: Aluminum single cavity / Aluminum double cavity / Plastic / Stainless steel single cavity

Signal output: 4.... .20mA/HART ( two wire / four wire ) / RS485 Mod bus

APPEARANCE OF SIZE

TECHNICAL PARAMETERS

Process connection : Thread G1½"A / Thread 1½"NPT / Flange

Antenna profile: stainless steel / PTFE

Housing: Seal between housing and housing cover Silicone rubber

Housing window: PolycarbonateGrounding terminal: Stainless steel

Supply voltage: 2-wire Standard (16 to 26) V DCIntrinsically safe (21. 6 to 26. 4) V DCPower consumption max 22. 5mA / 1WAllowable ripple

Explosion-proof type - <100Hz Uss < lV- (100 to 100K) Hz Uss < l0mV(22. 8 to 26. 4) V DC Two-wire system(198 to 242) V AC four-wire / 110V AC four-wire

Cable parameters: Cable inlet/plug 1 M20xl.5 cable inlet1 blind plug M20xl.5

Wiring terminals: Wire cross section 2.5 mm²

Output parameters: Output signal (4 to 2 0) mACommunication protocol HARTResolution 1. 6 μA

Fault signal Current output constant20. 5mA22mA;3.9mA

Integration time: (0~36)s, adjustableBlind area End of antenna

Maximum measuring distance: KD-901 10m (liquid type)KD-902 30m (liquid type)

KD-902T 20m (liquid type)KD-903 70m (solid type)

KD-904 80m（solid type）KD-905 30m（solid type）

KD-906 20m (Liquid type)Microwave frequency ：26GHz

Communication interface: HART communication protocol

Measurement interval: approx. 1 second (depending on parameter settings)

Adjustment time: approx. 1 second (depending on parameter setting)

Display resolution: 1mm

Operating storage and transport temperature ： (-40～100) ℃

Process temperature (temperature of the antenna section): KD-901 (-40 to 130) °C KD-902 (-40～250)℃

KD-902T (-40～250)℃KD-903 (-40～250)℃

KD-904 (-40～250)℃KD-905 (-40～250)℃

KD-906 (-40～200)℃Relative humidity： ˂95%

Pressure : Max. 4MPa

Shock resistance: Mechanical vibration l0m/s² , (10～150)Hz

INSTALLATION REQUIREMENTS

Install at 1/4 or 1/6 of the diameter.Note: The minimum distance from the tank wall should be 200mm.Note: ① datum plane; ② central or symmetry axis of the vessel

The flat top of the conical tank, which fits right in the middle of the tank top, ensures measurement to the bottom of the cone.

When there is a material pile, the antenna should be aligned with the material surface vertically. If the material surface is not flat and the pile angle is large, you must use the universal flange to adjust the horn angle so that the horn is aligned with the material surface as much as possible. (Due to the inclined solid surface will cause echo attenuation, and even loss of signal problems)

   Meter  Linearity

902

The launch angle depends on the antenna size

-￠46mm                         18°

-￠76mm                         12°

-￠96mm                          8°

-￠121mm                        6°

Accuracy                         See below（±5mm）

The Electrical Connection  

• The power supply voltage:

• Cable Connection

• Connection  mode

Ø  24V  two wire wiring diagram as follows:

 Ø  6~24V Modbus-RS485 wiring diagram as follows:

• Explosion Proof Connection

The explosion-proof form of this product is intrinsically safe.The intrinsic safety version sensors (Exia Ⅱc T6) use Alu-die casting housing and filling Silicone rubber sealants internal structure aimed to prevent sparks resulted from circuit failure from leaking out. It is applicable for the continuous level measurement of flammable medium under Exia Ⅱc T6.

A safety barrier FBS-2 must be used together with the intrinsic safety instrument. It is an associated device to this product for the power supply of this product. The main specification is intrinsic safety: ExiaⅡc, voltage of power supply: 24V DC±5%, short-circuit current: 135mA, operating current: 4...20mA.

All cables must be shielded. The max length is 500m for the cable from the barrier to the sensor. Stray capacitor≤0.1μF/Km, stray inductance 1mH/Km. Instrument must be connected to the ground potential. Any unapproved associated device is not allowed to be used.

 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 meter fully meets the requirements of protection class IP66/IP67, please ensure the waterproof characteristics of the cable seal.  As shown below:

     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

Three kinds of debugging method:

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

2) Debug through computer software   

3) HART Handheld programmer

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 debugging:

Connected to PC by HART

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

 HART  handheld  programmer:

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

 Product  Model  Selection

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