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Radar submersible capacitive ultrasonic level transmitter price water level transmitter 702

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Radar submersible capacitive ultrasonic level transmitter price water level transmitter 702
Liquids, especially highly corrosive liquids
Measuring Range:
Protection Grade:
Process Pressure:
Process Temperature:
-40~130℃(standard type)/-40~200℃(high temperature type)
Process Connection:
Thread/flange (optional)
Explosion proof certification:
Exia ⅡC T6 Ga / Exd IIC T6 Gb
Outer Covering:
Aluminum single chamber / aluminum double chamber / plastic single chamber / stainless steel single chamber
Power supply
Two-wire system (DC24V) Four-wire system (DC24V/AC220V)
Signal output
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1、Measurement  Principle

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  • Principle:

High-frequency microwave pulses issued by the guided wave radar propagate along detection components (steel cable or steel rod), met the media to be measured, since the dielectric constant of the mutation, cause reflections, a portion of the pulse energy is reflected back. Transmit pulse and the reflected pulse is proportional to the distance and the time interval measured media.

  • Features:

As a result of advanced microprocessor and unique Echo Discovery echo processing technology, guided wave radar level meter can be used in a variety of complex conditions.

Because of the type of process connections and detection components, making Guided Wave Radar Level Meter is suitable for a variety of complex conditions and applications. Such as: high temperature, high pressure and low dielectric constant media.

Pulsed work, guided wave radar level instruments transmit power is very low, can be installed in a variety of metals, non-metallic container, no harm to humans and the environment.

  • Explanation:

Guided Wave Radar is a time travel to the principle of measuring instruments, radar run at the speed of light, the running time can be converted into a level signal by electronic components. When the pulse reaches the surface of the material, the pulse is reflected back and is received by the receiving container inside the instrument, the distance the signal is converted to level signals.

Reflected pulse signal along the cable or rod probe type transmit to the instrument electronic circuit parts, the microprocessor processes the signal, identify the microwave pulse echo generated in the material surface. Correct identification of the echo signal are completed the implementation by the pulse software,D, the distance from the material surface and the pulse travel time T is proportional: 

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Where C is the speed of light

Because the empty distance E is known, the level L is:



By entering the empty height of E (= zero), full tank

height F (= hundred) and the application to set

some parameters, application parameters will

automatically adapt the instrument to measure

the environment, corresponding to the 4-20mA


  • Measuring range:

--Blind spot is the minimum distance between the top of the highest material surface materials and measurement reference point.

--The bottom of the blind refers to a distance near the very bottom of the cable can not be accurately measured.

--Between the top and bottom of the blind is blind effective measure  distances.

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H--- Measuring range

L---Empty distance

B---The top of the blind

E---The minimum distance from the probe

 to the tank wall


In order to ensure the accuracy of level measurement,

the material should be located between the top and

bottom of the blind the blind.

2、Product  Introduction


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Suitable for Medium: Liquid, solid powder

Application: Liquid and solid powder measure,

                    complicated process conditions

Explosion-proof Grade: ExiaⅡC T6 Ga /Exd ⅡC T6 Gb

Measuring Range: cable style  30m / rod  style  6m

Frequency: 500MHz-1.8GHz

Antenna: Single cable or single rod antenna

Accuracy: ± 5mm

Temperature: -40℃~120℃(Standard type)

                       -40℃~230℃(High temperature type)

Process pressure:(-0.1~4)MPa

Signal output:(4~20)mA Hart / Modbus-RS485

The Scene Display: Four-digit LCD programmable

Power Source: Two-wire (DC24V)


Outer casing: Aluminum / Plastic / Stainless Steel

Connection: Flange (optional) / Thread

3、Installation  Guide

Within the measurement range, determined not to come into contact with the cable or rod internal obstacles, Therefore, the installation should be avoided as far as possible the tank facilities, such as: human ladder, limit switches, heating devices, stand etc. Also note that the cable or rod may not intersect with the material during feeding.

  • Installation Precautions: 

Highest Level measurement can not enter into the blind; Must be maintained between the instrument and the tank wall a certain distance; When the meter is installed, try to stick with cable or perpendicular to the surface of the measured medium. Meter installation in hazardous areas must comply with state regulations explosion hazardous installation area. Intrinsically safe instrument requires the use of shell with aluminum. Intrinsically safe instrument can be installed in explosion-proof requirements of the occasion, the instrument must be connected to the earth.

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Installation position: 

Ø Far away from the discharge port and inlet.

Ø Metal cans in the entire measuring range, not to touch the tank wall and tank bottom.

Ø Recommended meter installed in 1/4 or 1/6 of the silo diameter, and the minimum distance is 1/10 of the tank wall of the measuring range.

Ø Cable type or rod probe the minimum distance from the tank wall ≥300mm.

Ø Bottom of the probe from the tank bottom ≥30mm.

Ø The minimum distance from the probe obstructions ≥200mm.

Ø If the bottom of the container is a cone, you can install a central tank top.


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Measurement characteristics of rod radar level:

Ø You can measure any dielectric permittivity of ≥1.8 .

Ø Generally used to measure viscosity ≤500cst, not prone to adhesion medium.

Ø Rod radar maximum range of 6 m.

Ø Instrumentation for steam and foam has a strong penetrating power, the measurement is not affected.

Ø For a lot of foam liquid measurement environment, you should select a single rod guided wave radar level meter measurement.




  • Installation Method: 

Ø Reasonable meter installation to ensure long-term reliable and accurate measurement 

Guided wave radar level meter adopts thread and flange connection and can be installed on short pipe. The smaller the diameter of the installation pipe, the shorter the pipe length, and the more stable the measurement. When the diameter of the installation short pipe is 2" to 6", the height of the installation short pipe should be ≤200mm. If the short tube is long, it is best to shorten the short tube or lengthen the sensor shielding section.

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Ø Installation in short pipe of DN200 or DN250:  

When the guided wave radar is installed on a short tube with a diameter greater than 200mm, the inner wall of the short tube will generate echoes, which may easily cause measurement errors due to the low dielectric constant of the medium. Therefore, for a short pipe with a diameter of 200mm or 250mm, a special flange with a "horn interface" needs to be selected.

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Ø Installation Notes on plastic containers:  

Whether cable or rod type, if you want to guided wave radar is working properly, the process of connecting to the metal surface should be. When the guided wave radar mounted on a plastic pot, If the tank top is plastic or other non-conductive material, the instrument needs with metal flanges, the use of threaded connections, to be equipped with a metal plate.

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  • Installation instructions  

The rod probe can be up to 6 meters long. For storage tanks with a measuring distance of more than 6 meters, cable probes are used.

If there are many obstacles in the tank or the probe is easily approached to the sensor, the guided wave-pipe device can be added for measurement.

Pull down force on the rope 

When feeding and discharging, the medium produces a pull-down force on the cable probe. The pull-down force depends on the following factors:

A. The length of the rope                           B. The density of the material

C. The diameter of the storage bin            D. The diameter of the rope

Optimization of interference  

Interference echo suppression: Programming and debugging software can realize the suppression of interference echo, so as to achieve the ideal measurement effect.

For media with a viscosity not greater than 500cst (only for liquids), bypass pipes or  guided wave-pipe can be used to avoid interference.

Installation of low dielectric constant liquid      

For media with dielectric constant greater than 1.3, viscosity ≤ 500cst and not easy to produce adhesion, the guided wave-pipe can be installed for measurement, and the following effects can be achieved:Installation and fixation with the same measurement of solid powder compartment.

  • Excellent reliability, high precision

  • It can be used for any medium with a dielectric constant ≥1.3, and the measurement has nothing to do with the conductivity of the medium

  • Obstacles in the tank and the size of the short pipe do not affect the measurement

Corrosive medium measurement: 

If measuring corrosive media, you can use rod or cable probe sleeve PTFE, PFA sleeve for measurement.

  • Special instructions and precautions: 

Ø For guided wave radars with too long cables in field use, it is necessary to cut off the excess cables, and the cables cannot be knotted, entangled or attached to other objects.

Ø When cutting the cable, first cut off the power of the instrument, remove the cable, remove the screws, cut from the bottom of the cable, and install the weight after the cut is completed, and then the power can be switched on and the parameters can be reset.

Ø For cable guided wave radar with protective sleeve, when the cable is too long, it must not be intercepted by itself, and it must be returned to the original factory for cutting.

Ø For the instrument installed in the still-pipe, the radar probe must be fixed with an insulating bracket to ensure that the radar probe (rod/cable) and the still-pipe are concentric, otherwise the measurement will be affected by vibration or false echo.

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Installation of right and wrong

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  • Moisture

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4、Structure Size(Unit: mm)

  • Outer Case size

Ø Cast aluminum shell

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Ø Plastic shell

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  • Product size

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  • Flange  type

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5、The  Electrical  Connection

  • The power supply 

(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 two-core shielded cable. The supply voltage range see technical data.

Modbus-RS485(Four wire system)

Power supply and Modbus signal line separated respectively using a two-core shielded cable, the power supply voltage range see technical data.

  • Cable Connection

General Introduction

Supply cable can use ordinary two-core cable,  the cable diameter should be (6~12) mm, to ensure that the cable entry seal. If electromagnetic interference exists, recommended to use shielded cable.

(4~20) mA/HART(Two-wire)

Supply cable can use ordinary two-core cable.

(4~20) mA/HART(Four-wire)

Supply cable should be used with a dedicated ground cable.


Shielded cable should be used for the power supply cable.

Shielding and wiring

Both ends of the shielded cable should be grounded. Inside the sensor, the shield must be connected to the internal ground terminal. The external ground terminal on the enclosure must be connected to the ground.

If there is ground current, the shielded cable must be grounded through a ceramic capacitor (for example: 1nF/1500V) far away from the shielding end of the instrument side to block direct and bypass high-frequency interference signals.

  • Wiring Diagram

Ø 24V  two wire wiring diagram as follows:


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

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  • Explosion Proof Connection 

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: Exia ⅡC, 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.

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  • 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:

The instrument fully meet the requirements of protection class IP66/67, make sure the cable head waterproof seal.  As shown below:

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How to ensure that the installation meets IP67 requirements:

Make sure that the sealing head is not damaged.

Make sure that the cable is not damaged.

Make sure the cable is used in line with the electrical connection specifications.

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

Please tighten the cable sealing head, see ②

Keep electrical interface with blind unused block after block tight, see ③

6、Instrument debugging

  • 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.

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Display / Button 


① Liquid Crystal Display

② Adjust by button 


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PC software debugging:

Connected to PC by HART


①  USB interface                      

②  Radar level meter

③ HART converter

④  250Ω resistor

PC software debugging:

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HART Handheld programmer  :



①  HART Handheld programmer

②  Radar level meter

③  250Ω resistor

7、Technical Specification

General Parameters

Probe Material:


Stainless steel (304, 316L) sleeve PTFE, PFA


Stainless steel (304, 316L) sleeve PTFE, PFA

Process Connection

Stainless steel + PTFE flange

/ThreadG1½″A , Thread 1½″NPT   /Clamp


Viton fluorine rubber, Kalrez fluorine rubber

Outer casing

Aluminum,Plastic,Stainless Steel

Seal between the outer casing and the cover

Silicone Rubber

View Point  Window


Ground  Terminal 

Stainless Steel 316L

Power Supply

2-Wire system

24V DC

4-Wire system

6~24V DC  (Modbus-RS485)

198 ~242V AC (Flameproof Type / Double cavity)

110V AC  (Flameproof Type / Double cavity)

Power Consumption

max. 22.5mA

Ripple Allowed

- <100Hz                   Uss < lV

- (100~100K)Hz       Uss < l0mV

Cable parameters

Cable Entry / Plug

One cable entry of  M20×l.5 (cable diameter of  6~12mm)

One blind stopper M20×l.5

Spring Connection Terminal

 Applicable for cables with cross section of 2.5mm 

Output parameters

Output Signal 

 (4~20)mA  HART /  Modbus-RS485



Fault signal  

Current output is unchanged;


2-wire load resistance 

See the diagram below

4-wire load resistance

Max 500Ω

Integration Time

 ( 0~36)sec, adjustable

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Characteristic Parameters

Max Measurement Distance

20m /6m(Cable /Rod)

Measurement Interval

 About 1sec (Depend on parameter settings)

Adjustment Time

 About 1sec (Depend on parameter settings)

Resolution of Display 




Accuracy diagram

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Temperature for Storage/Transport 

 (-40~80) ℃

Process Temperature  (Antenna part)

(-40~120)℃ Standard type

(-40~200)℃  High temperature type

Relative Humidity 



 Max. 1.0MPa

Vibration Proof 

Vibration frequency (10~150) Hz,

maximum vibration acceleration l0m/s²

Max Pulling Force 

See the illustrative diagram on pulling force

When measuring solid medium, the pulling force is determined by the diameter of vessel and medium level, some examples of pulling force generated by typical medium are shown on the diagrams below.

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8、Product  Model  Selection


         Maximum  Range / Type of detecting component

   20000mm / Full PTFE sealing cable  type   or   6000mm / Full PTFE sealing  rod  type

Explosion  Proof  Approval

P   Standard (Without Approval)

I     Intrinsically Safe(Exia ⅡC T6 Ga)

G   Flameproof (Exd  ⅡC T6 Gb)

Type of detecting component /Material

    Cable  Φ4mm   / PTFE

B     Cable  Φ4mm   / PFA

C     Rod  Φ10mm   / PTFE

D     Rod  Φ11mm   / PFA 

Process Connection /Material

G   Thread     G1½″ A

N   Thread    1½″ NPT

C   Flange  DN50   PN16  / Stainless Steel PTFE

D   Flange  DN80   PN16  / Stainless SteePTFE

E   Flange  DN100  PN16  / Stainless Steel PTFE

F   Flange  DN150  PN16  / Stainless Steel PTFE

H   Flange  DN200  PN16  / Stainless Steel PTFE

I    Flange  2150LBS ANSI  Convex / Stainless Steel 316LPTFE

J    Flange  3150LBS ANSI  Convex / Stainless Steel 316LPTFE

K   Flange  4150LBS ANSI  Convex / Stainless Steel 316LPTFE

L   Flange  6150LBS ANSI  Convex / Stainless Steel 316LPTFE

M  Flange  8150LBS ANSI  Convex / Stainless Steel 316 LPTFE

                                         Seal / Process Temperature

1. Normal (-40120)   

2. High Temperature (-40200)

The  Electronic Unit 

           3   (4~20) mA / 24V DC / HART two wire system

4   (4~20) mA / 220V AC / HART four wire system

5   Modbus-RS485  / 6~24V four wire system

                                                                 Outer Covering / Protection Class  

L    Aluminum / Single cavity / IP67

H   Aluminum / Double cavity / IP67

G   Plastic / Single cavity / IP65

K   Stainless steel / Single cavity / IP67

                                                                             Cable   Line

M    M 20×1.5

N    ½″  NPT

                                                                                     Display  / Programming

                                                                                      A   With

                                                                                      X   Without

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