Kaidi Sensors guided wave radar level transmitter principle of operation factory for detecting

PRODUCT OVERVIEW

6GHz intelligent series radar level meter is suitable for non-contact continuous measurement of level of liquid, slurry, granule and lump material, suitable for temperature and pressure changes; occasions where inert gas and volatilization exist.

It adopts the measurement method of microwave pulse, and can work normally in the industrial frequency band range. Low beam energy, can be installed in a variety of metal, non-metallic containers or pipes, no harm to human body and the environment.

THE PRODUCT PRINCIPLE

Very short microwave pulses of very low energy are transmitted and received through an antenna system. The radar wave travels at the speed of light. The running time can be converted into a level signal by means of electronic components. A special time-stretching method ensures stable and accurate measurements in a very short time. Even in the case of complex conditions and spurious echoes, the level echoes can be accurately analyzed using microprocessor technology and commissioning software.

The antenna receives the reflected microwave pulses and transmits them to the electronics. The microprocessor processes this signal and identifies the echoes generated by the micropulses on the material surface. The correct identification of the echo signal is done by the pulse software with an accuracy of millimeters.

The distance D from the material surface is proportional to the time travel T of the pulse: D=C×T/2; where C is the speed of light. Since the distance E from the empty tank is known, the level L is: L = E - D.

It is set by entering the empty tank height E (=zero), full tank height F (=full range) and some application parameters, which will automatically adapt the instrument to the measurement environment. Corresponds to 4-20mA output.

PROTECTION GRADE

This instrument fully meets the requirements of protection class IP66/67. Please make sure that the cable sealing head is waterproof. As shown

How to ensure that the installation meets the requirements of IP67:

Please make sure that the sealing head is not damaged.

Please ensure that the cable is not damaged.

Please ensure that the cable used meets the requirements of the electrical connection specification.

Before entering the electrical connection, bend the cable downwards to ensure that water does not flow into the housing, see ①

Please tighten the cable sealing head, see ②

Please plug the unused electrical connections with blind plugs, see ③

PRODUCT SPECIFICATION

APPEARANCE OF SIZE

TECHNICAL PARAMETERS

General data Material Antenna PTFE, PP

Housing Aluminum, plastic, antistatic PP, stainless steel 316

Seal between housing and enclosure Silicone rubber

Housing sight glass Polycarbonate

Grounding terminal Stainless steel

Process connection HBRD801 G1½″A thread or 1½″NPT thread / flange

KD802 PTFE Flanged Flange

KD803 Stainless Steel Flange

KD804 Stainless Steel Flange

KD805 Stainless Steel Flange

KD806 Stainless Steel Flange

Power supply voltage Two-wire system Standard type (16～26)V DC

Intrinsically safe (21.6~26.4)V DC

Power consumption max. 22.5mA

Allowable ripple

- <100Hz Uss < lV

- (100~100K)Hz Uss < l0mV

Flameproof type (22. 8 to 26. 4) V DC Two-wire system

  (198～242) V AC 4-wire / 110V AC 4-wire

Power consumption max. 1VA, 1W

Cable parameters Cable inlet/plug 1 M20xl.5 cable inlet (cable diameter 5 to 9 mm)

1 blind plug M20xl.5

Spring terminal block for wire cross section 2.5 mm²

Output parameters Output signal (4 to 20)mA/HART

Resolution 1.6μA

Fault signal Current output constant; 20.5mA; 22mA; 3.9mA

Two-wire load resistance See figure below

Four-wire load resistance 500Ω max.

Integration time (0 to 36)s, adjustable

Characteristic parameters Blind area End of antenna

KD801 20m (liquid)

KD802 20m (liquid)

KD803 35m

KD804 35m

KD805 20m

KD806 15m

Measurement interval approx. 1s (depending on parameter setting)

Adjustment time approx. 1s (depending on parameter setting)

Resolution 1mm

Accuracy 10mm or <0.1% (see accuracy diagram below)

Operating storage and transport temperature (-40 to 80) °C

Process temperature (temperature of antenna section)

KD801 -40～130℃

KD802 -40～130℃ (standard type) / -40～180℃ (high temperature type)

KD803 -40～130℃ (Standard type) / -40～180℃ (High temperature type)

KD804 -40～130℃ (standard type) / -40～180℃ (high temperature type)

KD805 -40～130℃ (standard type) / -40～180℃ (high temperature type)

KD806 (-40～400)℃

Relative humidity ＜95%

Pressure inside the tank Max. 4MPa

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

INSTALLATION REQUIREMENTS

Recommended location (2), the tank wall to the outer wall of the installation short pipe should meet the following requirements: the best distance from the tank wall is 1/4 or 1/6 of the tank diameter, the minimum installation distance from the tank wall is 1/10 of the measurement range. for example: 10m level tank, the minimum installation distance from the tank wall should be 1m.

● Cannot be installed above the inlet (4)

● It cannot be installed in the center (3). If it is installed in the center, multiple false echoes will be generated and the interference echoes will cause the real signal to be lost.

● If the distance between the instrument and the tank wall cannot be maintained, the medium on the tank wall will adhere to cause false echoes, and false echoes should be stored during the commissioning of the instrument.