Introduction

principle

Guided wave radar is a measuring instrument based on the principle of time travel. The radar wave runs at the speed of light, and the running time can be converted into a level signal through electronic components. The probe emits high-frequency pulses and conducts along the cable or rod probe. When the pulses meet the surface of the material, they are reflected back and received by the receiver in the instrument, and the distance signal is converted into a level signal.

enter

The reflected pulse signal is conducted along the cable or rod probe to the electronic circuit part of the instrument, and the microprocessor processes the signal to identify the echo generated by the microwave pulse on the surface of the material. The correct echo signal identification is completed by intelligent software. 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 of the empty tank is known, the material level L is: L=ED

output

Set by entering empty tank height E (= zero point), full tank height F (= full scale) and some application parameters, the application parameters will automatically adapt the instrument to the measurement environment. Corresponds to 4…20mA output.

Measuring range

F——measurement range E——empty tank distance B——top blind area

H——The minimum distance from the probe to the tank wall The top dead zone refers to the minimum distance between the highest material surface of the material and the measurement reference point. Bottom dead zone is a distance near the very bottom of the cable that cannot be accurately measured. The effective measurement distance is between the top dead zone and the bottom dead zone.

Notice:

Reliable measurement of the level in the tank can only be guaranteed when the material is between the top dead zone and the bottom dead zone.

technical parameter

working frequency:100MHZ-1.8GHZCommunication Interface:RS485 (MODBUS) communication protocol
Measuring range:Cable type: 0-30mHART communication protocol
Pole: 0-6mProcess connection:G1、G1 1/2
Double pole type: 0-6mNPT1、NPT1 1/2
Very low dielectric type: 0-6mFlange DN50, DN80
Repeatability:±2mmFlange DN100, DN150
Resolution:1mm samplingProcess pressure:-1-20bar
Echo sampling 55 times/s-1-400 bar
responding speed:>0.2S (depending on the specific usage)power supply:Power supply: 24VDC (±10%), ripple voltage: 1Vpp
Output current signal:4…20mApower consumptionmax 22.5mA
Accuracy:±3mmEnvironmental conditions:Temperature -40℃…+70℃ /-40℃…+2 5 0℃ /
Enclosure rating:IP67-40℃…+400℃
Cable entry:2 M20*1.5 (cable diameter 5–9mm)Explosion-proof grade:From d II C T6
2 1/2 NPT (cable diameter 5–9mm)Two-wire wiringThe instrument power supply and signal output share a two-core shielded cable

Selection table

RR30A–Threaded cable guided wave radar level gauge (liquid level gauge)
RR30B-Threaded Rod Guided Wave Radar Level Meter
RR30C-Double Rod Flange Guided Wave Radar Level Meter
RR30C1-Very Low Dielectric Constant Guided Wave Radar Level Meter

Application range

Cable range 0-30000mm

Rod type range 0-6000mm

Signal output

2-wire system/DC24V, current signal output 4…20mA

2-wire/DC24V, current signal output (4…20mA) HART protocol

4-wire/DC24V, current signal output (4…20mA) MODBUS-RS485

Connection thread (choose one of thread & flange)

G1 A thread
G11/ 2A thread

1 NPT thread
11/ 2NPT thread

Connecting flange (thread & flange can choose one)

Flange DN50
Flange DN100

Flange DN80
Flange DN150

Process temperature

Ordinary sealing -40…100℃

High temperature sealing -40…250℃ with heat sink

High temperature sealing -40…400℃ with heat sink

electrical wiring

2-wire/DC24V

4-wire/DC24V

(special alternative) VARIO

No special accessories

Intrinsically safe explosion-proof type (EXia II C T6)

Process Connection Flange Custom Dimensions

Optional Field Display Programmer
The above selection table does not contain selection codes. For selection, please contact the sales staff or email to sales@kewill-auto.cn to obtain a complete sample.
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