Ultrasonic Liquid Level Gauge

1. Product Brief Introduction:

(1) Integrated ultrasonic liquid level gauge

The integrated ultrasonic level gauge is widely used for liquid level and volume measurement in tanks, water tanks, reservoirs, and also for flow measurement in open channels. In practical applications, many interfaces cannot be touched, such as situations where the measurement equipment is corroded (by acids or alkalis), contaminated by the measurement equipment (in sewers), or where substances that cause adhesion (adhesives) are present on the measurement device. Since the measurement technology of the integrated ultrasonic level meter is based on the non-contact ultrasonic principle, the integrated ultrasonic level meter is suitable for liquid and material level positions that cannot be accessed by physical means.

(2) Split-type ultrasonic liquid level gauge

The split-type ultrasonic level gauge, both panel-mounted and wall-mounted, boasts a neat and clear appearance. It eliminates the need for configuring standard secondary meters, greatly facilitating installation and commissioning. This design is particularly suitable for new construction projects, facilitating unified planning and design. When paired with a nearby corrosion-resistant transducer, it can measure the level of highly corrosive liquids.

(3) Explosion-proof ultrasonic liquid level gauge

Explosion-proof ultrasonic level gauges are used for measurements in flammable, explosive, and other hazardous working conditions that require explosion protection.

(4) External-mounted ultrasonic liquid level gauge

The external-mounted ultrasonic liquid level gauge adopts leading digital signal processing technology, eliminating the influence of container wall thickness and achieving true non-contact external measurement of liquid level height in sealed containers. The sonar sensor (probe) is installed directly below (at the bottom) of the outer wall of the container being measured, without the need to open any holes in the container. The installation is simple, allowing for online installation and debugging without affecting production. It can measure the liquid level of various flammable, explosive, toxic, and other hazardous media, strong acids, strong alkalis, and various pure liquids in high-temperature and high-pressure sealed containers.

2. Product Features:

Integrated & Split Type:

Explosion-proof Type:

◆ Safe/using die cast aluminum alloy waterproof and explosion-proof shell; The explosion-proof level of the instrument reaches Exd (ia) Ⅱ BT4.

◆ Stable and reliable/We select high-quality modules and key components from the power supply section during circuit design, and choose highly stable and reliable devices for procurement, which can completely replace imported instruments from abroad.

The patented technology/ultrasonic intelligent technology software can perform intelligent echo analysis without any debugging or other special steps. This technology has the functions of dynamic thinking and dynamic analysis.

◆ High precision/Our company's patented sound wave intelligent technology greatly improves the accuracy of the ultrasonic level gauge, with a level accuracy of 0.3% and the ability to resist various interference waves.

◆ Low failure rate, easy installation, and easy maintenance/This instrument is a non-contact instrument that does not come into direct contact with liquids, so the failure rate is relatively low. The instrument provides multiple installation methods, and users can calibrate the instrument completely through this manual. Multiple protection/instrument protection levels reach IP65; All input and output lines have lightning protection and short-circuit protection functions.

External-mounted Type:

(1) Pioneering the two-wire system
We have overcome various technical difficulties and successfully developed a two-line external mounted liquid level gauge. The two-wire external mounted liquid level gauge achieves ultra-low power consumption, meets the industrial field two-wire instrument standard, simplifies on-site wiring requirements, and is more conducive to safety and explosion prevention.
(2) Non contact measurement of liquid level, safe
Realize true non-contact measurement, making installation and maintenance significantly simpler and more convenient.

(3) Advanced automatic power control algorithm, capable of achieving small blind spots or no blind spots
When the liquid level is high, use higher power, and when the liquid level is low, use lower power to automatically switch the probe power. It not only increases the measurement range, but also reduces the measurement blind spot. Thus, small blind spots or even measurements without blind spots have been achieved.
(4) Ultra high measurement accuracy, up to 1 ‰ FS
By using the built-in bottom boundary false wave suppression function, automatic power control algorithm, automatic sampling rate control algorithm and other functions, the measurement accuracy is greatly improved, with an accuracy of 1cm in some practical cases.
(5) Simultaneous measurement of liquid level boundary
It is possible to measure both liquid level and boundary position simultaneously. Can configure analog, 485, and Modbus outputs as boundary or liquid level.
(6) Equipped with bottom boundary false wave suppression function
In some cases, there may be other media at the bottom of the storage tank, and the interface formed by them can affect the transmission of signals, thereby affecting normal measurements. This function will automatically identify false waves, skip false waves, and search for the true echo signal. As 
(7) Real time measurement of tank temperature and remote transmission of temperature signals
Real time measurement of tank temperature and remote transmission of temperature signals through analog or digital signals
(8) Real time temperature calibration to improve measurement accuracy
It can measure the temperature of the storage tank in real time and perform a certain degree of temperature compensation. For common media such as liquid ammonia, propylene, propane, LPG, etc., it can also perform sound velocity compensation to further improve measurement accuracy.
(9) Automatic calibration and self diagnostic functions
The automatic calibration function of the external mounted liquid level gauge overcomes the problem of reduced accuracy after long-term use of traditional liquid level gauges. It has increased the reliability and stability of the external mounted liquid level gauge in terms of its own working status and hardware diagnostic function.
(10) Pipeline calibration, automatically enabled
When the liquid level is below half, the calibration probe on the side cannot perform normal calibration. The level gauge automatically activates pipeline calibration and performs real-time calibration through the inlet and outlet pipelines to further improve measurement accuracy.
(11) Full range real-time tracking, no need to restart when empty tank is filled with liquid
Whether it is an empty tank or liquid, regardless of the level, the level gauge can track the full range in real-time.
(12) Installation and debugging are greatly simplified
The liquid level gauge is highly intelligent, greatly reducing on-site installation and debugging work, achieving a foolproof installation.
(13) There are multiple options for displaying remote indicators on the liquid level gauge
The liquid level gauge can display remote liquid level, liquid level percentage, volume, mass, etc.

(14) With relay output
It can achieve single point alarm or dual point alarm output.

3. Technical Specifications:

(1) Integrated Type:

Range 4m, 6m, 8m, 10m, 15m, 25m
Sensor material PP, PVDF, PTFE, stainless steel (DIN1.4571, AISI SS316Ti)
Launch angle 5 °~7 °
Shell material plastic: PBT fiberglass, flame retardant (DuPont) aluminum: dust-proof coating
Working temperature: PP, PVDF, PTFE type: -30 ℃~+90 ℃; Stainless steel type: -30 ℃~+100 ℃ (can withstand CIP 120 ℃ and can withstand 2 hours of cleaning)
Environmental temperature -30 ℃~+60 ℃ (equipped with SA-100 programmer), -25 ℃~+60 ℃ and avoid direct sunlight
Pressure (excellent) 0.5-3bar (0.05-0.3MPa) Stainless steel 0.9-1.1bar (0.09-0.1MPa)
Sealing strip material PP type: EPDM; Other models: FKM (VIton)
Protection level sensor: IP68 (can be immersed in water); Shell: IP67 (NEMA6)
Power supply/power consumption high voltage type: 85-255VAC/6VA; Low voltage type: 10.5-40VDC/3.6W, 10.5-28VA/4VA
Accuracy ± (0.2% measurement distance,+0.05% range)
Resolution measurement distance:<2m: 1mm, 2-5m: 2mm, 5-10m: 5mm;  >10m: 10mm
Output analog output: 4-20mA, 600 Ohm
Contact output: 250VAC, 3A
Computer: RS485 (optional)
HART (optional)
Display (SAP-100): 6-digit, graphic, user LCD
Electrical connection 2 × Pg16 or 2-1/2 "NPT; Wire cross-section: 0.5-2.5mm2
Aluminum casing for electrical protection: Class I, plastic casing: Class II.

(2) Split Type:

Power supply: 220VAC and 24VDC (AC/DC dual-use)
Transmission distance:

① Remote transmission type ≤ 300m (four wire system: any wire can be used as long as it can meet mechanical strength)
② Nearby type ≤ 30m (using cable TV RF cable, manufacturer's standard wiring of 3 meters)
Signal output: 4-20mA signal output Standard communication interface 232 or 485 (note: the stolen communication interface is non-standard)
Control output: 2 sets of 4 channels, programmable relay output
Transmission power: any segment from 0 to 60m
Blind zone: 0.35-1.00m (the blind zone is proportional to the transmission power)
Launch angle: 6 ° to 10 ° (the size of the launch angle is proportional to the launch power)
Resolution: Range ≤ 10m: 1mm. Range ≥ 10m: 10mm
Protection level: transducer: Ip68
Accuracy: 0.25-0.5%
Environmental temperature: Secondary table: -25 to+55 ℃
Transducer temperature:

① Far energy type -25~+55 ℃
② Nearby type -25~+70 ℃

(3) Explosion-proof Type:

Measurement range: 0-20m (each range can be set, specially customized);
Blind zone: 0.25m to 0.5m;
Distance measurement accuracy: 0.3%;
Distance measurement resolution: 1mm;
Pressure: below 3 atmospheres;
Instrument display: Equipped with LCD to display liquid level or spatial distance;
Analog output: 4-20mA four wire system;

Digital output: RS485, Modbus protocol or customized protocol;
Power supply voltage: DC24V/AC220V, built-in lightning protection device;
Environmental temperature: -20 ℃ to+60 ℃; Protection level: IP65.

(4) External-mounted Type:

Power supply: 220VAC and 24VDC (AC/DC dual-use)
Transmission distance:

① Remote transmission type ≤ 300m (four wire system: any wire can be used as long as it can meet mechanical strength)
② Nearby type ≤ 30m (using cable TV RF cable, manufacturer's standard wiring of 3 meters)
Signal output: 4-20mA signal output Standard communication interface 232 or 485 (note: the stolen communication interface is non-standard)
Control output: 2 sets of 4 channels, programmable relay output
Transmission power: any segment from 0 to 60m
Blind zone: 0.35-1.00m (the blind zone is proportional to the transmission power)
Launch angle: 6 ° to 10 ° (the size of the launch angle is proportional to the launch power)
Resolution: Range ≤ 10m: 1mm. Range ≥ 10m: 10mm
Protection level: transducer: Ip68
Accuracy: 0.25-0.5%
Environmental temperature: Secondary table: -25 to+55 ℃
Transducer temperature:

① Far energy type -25~+55 ℃
② Nearby type -25~+70 ℃

4. Measuring Principle:

The ultrasonic level gauge is vertically installed on the surface of the liquid, emitting an ultrasonic pulse to the liquid surface. After a period of time, the sensor of the ultrasonic level gauge receives the signal reflected back from the liquid surface. The signal is selected and processed by the transmitter circuit, and the distance from the liquid surface to the sensor is calculated based on the time difference between the ultrasonic level gauge emitting and receiving ultrasonic waves. Due to the use of advanced microprocessors and unique EchoDiscovery echo processing technology, ultrasonic level gauges can be applied to various complex working conditions. Integrated ultrasonic level gauge refers to an ultrasonic level gauge with a probe and a housing combined together.

The externally attached liquid level gauge adopts the sonar ranging principle, using a dedicated probe externally attached to the container wall to collect sonar signals. With dedicated sonar wave processing technology as the system core and advanced high-speed signal processing technology, it calculates the liquid level inside the container using the proprietary algorithm *** of Shaanxi Shengke. The calculated liquid level value is displayed locally and outputs a remote signal. The instrument can output measurement results to the control center through interfaces such as (4~20) mA analog signal, HART, and RS-485, and can also perform online debugging through interfaces such as HART, RS-485, and infrared.

5. Selection:

6. Installation:

1) The distance from the sensor emission surface to the lowest liquid level should be less than the range of the selected instrument.
2) The distance from the sensor emission surface to the highest liquid level should be greater than the blind spot of the selected instrument.
3) The emission surface of the sensor should be parallel to the liquid surface.
4) The installation position of the sensor should try to avoid positions where the liquid level fluctuates violently, such as the inlet and outlet directly below.
5) If the pool wall or tank wall is not smooth, the instrument needs to be at least 0.3m away from the pool wall or tank wall.
6) If the distance from the sensor emission surface to the maximum liquid level is less than the blind spot of the selected instrument, an extension tube should be installed with a diameter greater than 120mm and a length of 0.35m to 0.50m. The extension tube should be installed vertically with a smooth inner wall, and the opening on the tank should be larger than the inner diameter of the extension tube. Alternatively, the pipe can be directly connected to the bottom of the tank, with a diameter greater than 80mm, and a hole can be left at the bottom of the pipe to facilitate the flow of liquid.

External-mounted type installation and calibration method:

Probe fixing method: