Ultrasonic level transducer functionality is the same as the radar system. From ultrasonic profiling to level monitoring, ultrasonic sensors are used in a wide range of applications including converting electrical energy into acoustic waves and vice versa.
The working principle of ultrasonic level indicator
The ultrasonic level sensor works by the “time of flight” principle when it comes to measuring level. Sound waves are sent by the device at a higher frequency of about 20kHz to 1GHz. These sound waves bounce back from the product surface, creating an echo that is redirected to the sensor. Thereafter, the sensor determines the level by calculating the time taken by the echo to return back. The ultrasonic level sensor works in both liquids and solids level measurement.
The main advantage of ultrasonic level transmitter is that the transducer doesn’t make physical contact with the process material since it has no moving parts. This typical property is very useful for measuring tanks’ levels with boiling, corrosive and hazardous chemicals.
On the other hand, the return signal can be affected by things like heavy vapors, powders, foam, surface turbulence and also ambient noise. Moreover, the temperature can limit ultrasonic device functionality – ultrasonic level transducer cannot operate on high-pressure areas or vacuum. Finally, the level transmitter isn’t convenient if the depth of the tank is high or the produced echo is absorbed or dispersed.
Technical Specification of Ultrasonic level Transducer
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Level Range:
0-4m, Blank distance
: 0.20m
0-6m,
Blank distance : 0.25m
0-8m,
Blank distance : 0.30m
0-12m,
Blank distance : 0.50m
0-20m,
Blank distance : 0.80m
0-30m,
Blank distance : 1.20m
0-40m,Blank
distance : 1.5 m
Accuracy: 0.2% of span
Output: 4-20mA
Output Load: 0-500Ω
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Display: 4 Digits LCD(All types have displays)
Temperature compensations: Automatic
Pressure Rating: 0.1Mpa
Cable Gland: PG13.5
Beam Angle: 8°, 5°(3db)
Sensor Material: ABS &PVC or PTFE
Protection level: IP67
Installation: Thread, Flange, Bracket
Parameter setting: 3 Induction buttons
Temperature Range : -40 ~75℃,HLT1 -20 ~75℃
Sampling time: 1second (adjustable)
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Model
Selections
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Item
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Code
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Specifications
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|
General
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HL
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HL
Ultrasonic Level meter
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Types
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T
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2-wire
series, compact display version
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N
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3-wire
series, compact display version
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R
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RS485
series, compact display version
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U
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4-wire
series, compact display version
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T1
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ExiaIICT6
,2-wire series, intrinsically safe explosion-proof
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F
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Standard
series, remote display version, standard 10m cable
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M
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Multi-functional,
remote display version, standard 10m cable
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VT
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2-wire
series, no display,24V DC,4-20Ma,cable 10m
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VT-T
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2-wire
series, no display,24V DC, Blue tooth config.cable10m*1
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VR
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4-wire,no
display,RS486,modbus RTU, cable 10m *2
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Range
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04
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0-4m
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06
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0-6m
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08
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0-8m
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12
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0-12m
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20
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0-20m
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30
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0-30m
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40
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0-40m
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Housing Colors &Material
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P
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Plastic （all）
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G
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Aluminum,
green color（only for HLT, HLN,
HLR series）
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B
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Aluminum, blue color（for all compact series except
HLR series）
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K
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Aluminum,
blue & gray （only for HLT series）
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V
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Aluminum,
white （only for HLT series）
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Wet part Material
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S
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ABS&PVC
((Simple anti-corrosion)
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F
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PTFE （Strict
anti-corrosion）
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Process connection
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2
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G2
screw (only for the range less than 8m)
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3
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DN50
flange (only for the range less than 6m)
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4
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DN65
flange (only for the range less than 8m）
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5
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DN80
flange (only for the range less than 12m）
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6
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DN100
flange(all)
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7
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DN150
flange(all）
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8
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DN200
flange(all）
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Output
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C0
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4-20mA(All)
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C2
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RS485-Modbus
protocol(only for HLR,HLVR and remote series)
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C3
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RS485-Profibus-DP
protocol(only for HLM series)
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C4
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Hart
protocol (only for HLU，HLM series)
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Switch Output
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0
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None
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2
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2
SPDT (only for HLU HLF HLM HLG series)
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4
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4
SPDT(only for HLM series）
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6
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6
SPDT (only for HLM series）
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Power supply
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D
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DC24V
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A
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AC220V
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*1HLVT-T
is can be figured by blue tooth, the software is not free, consult sales for
price.
*2
HLVR input power supply can be DC 3.5-5V, DC9-12V,DC 20-32V option
Conclusion
The ultrasonic level meter has a wide range
of applications. These devices are simple, cost-friendly and can measure
precise data without compromising your products. So they are a good choice for
the water, food and beverage industries.
