Integrated Ultrasonic Level Transmitter

 

 

 

Integrated Ultrasonic Level Meter

 

1. Technical Specifications

Parameter	Value
Measuring Range	0.05 ~ 15 m
Accuracy	±2 mm
Blind Zone (Dead Band)	5 cm
Beam Angle	±6°
Signal Output	4–20 mA / RS485 (switchable)
Two-wire power supply	DC 22 ~ 26 V
485 power supply	DC9~26V
Display Operating Temperature	-10 °C ~ 70 °C
Device Operating Temperature	-40 °C ~ 70 °C
Acquisition Frequency (2-wire)	1500 ms / configurable
Acquisition Frequency (RS485)	200 ms / configurable
Housing Material	PC (Polycarbonate)
Temperature Detection Range	-70 °C ~ 150 °C
Screen Backlight	Supported
Protection Rating	IP67
Communication Protocol	Modbus

2. Button Operation

Button	Function on Main Screen	Function in Settings Screen	Description
SET	Enter system settings	Return to previous level	Long-press or short-press to enter menus; navigate back step by step
▲ / Up	Enter system settings	Move up / increase value	Increment the current selection or numeric value
▼ / Down	Enter system settings	Move down / decrease value	Decrement the current selection or numeric value
OK	Enter system settings	Confirm / enter sub-menu	Confirm a selection or open the highlighted sub-menu

3. Installation Requirements  [Must be Observed]

• Perpendicular mounting: The antenna face must be as perpendicular as possible to the measured material or water surface to ensure the strongest echo.
• Keep away from inlets: The beam must NOT be aimed at the material inlet to avoid falling material interfering with measurement.
• No obstructions within the beam: Ensure that no ladders, steps, beams, or other obstacles exist within the beam angle (±6°) range.
• Conical vessels: Aim the beam directly at the lowest point of the tank bottom as much as possible to avoid inaccurate bottom measurement caused by oblique incidence.

4. Wiring Instructions

4.1  4–20 mA Two-Wire Connection

DC 22-26V+​ Power+/Signal+	→	V+
DC 22-26V-​ Power-/Signal-	→	V-

Power supply doubles as signal output. 4 mA corresponds to the low point of the measuring range; 20 mA corresponds to the high point.

 

Figure 1 — Wiring diagram for 4–20 mA two-wire connection

 

 

 

4.2  RS485 Communication

DC9-26V+	→	V+
DC9-26V-	→	V-
485-A	→	A
485-B	→	B

Default address code: 127. Default baud rate: 9600. Protocol: Modbus.

Figure 2 — Wiring diagram for RS485 communication

 

⚠ Recommended cable outer diameter: 4 – 8 mm. After power-on, the screen lights up, indicating that the supply is normal.

5. Quick Setup  [Ready in 3 Steps]

Step 1 — Power-on confirmation

Power-on Check:​ For 4-20mA mode, connect a DC 22–26 V power supply; for RS-485 mode, connect DC 9–26 V. A lit screen displaying the menu interface indicates a successful power-on.

⚠ After power-on, use a multimeter to verify that the supply voltage is between 22 V and 26 V. If the measured voltage is slightly below 22 V, turn off the screen backlight to reduce operating current and avoid inaccurate current output caused by under-voltage.

Step 2 — Set the installation height or installation water depth (choose one)

Press SET → select “Level Configuration” → press OK → choose “Installation Height” or “Installation Water Depth”.

• Installation Height = the distance from the sensor probe position to the tank/water bottom (requires manual measurement).
• Installation Water Depth = the current distance from the water surface to the tank/water bottom (requires manual measurement).

Enter the value and press OK to save.

Step 3 — Return to the main screen

Press SET to return step by step. The main screen now shows the real-time level / material level value. Setup is complete.

6. Common Settings Paths

Requirement	Menu Path
Switch installation mode	Application Configuration → Installation Mode → Normal / Suspended
4–20 mA calibration	Calibration Configuration → Current Calibration → 4 mA / 20 mA
4–20 mA range mapping	Calibration Configuration → Parameter Configuration → 4 mA Corresponds To / 20 mA Corresponds To
Switch signal output	Output Signal → RS485 / 4–20 mA
RS485 parameter setting	Configuration → Address Code / Baud Rate
Data fluctuation is large	Data Smoothing → Change Range + Duration + Sliding-window Filter
Weak echo energy	Application Configuration → Power Adjustment → Adjust to level 2–5
Multiple echoes in confined space	Application Configuration → Application Algorithm → Select Nearest Frequency Point
Language switch	Device Configuration → System Language → Chinese / English
Restore current to factory default	Calibration Configuration → Restore Default → Confirm
Screen backlight	Device Configuration → Screen Backlight → On / Off
Blind Zone Setting	Application Configuration → Installation Mode → Microwave Blind Zone

 

Suspended (hanging) installation:

Directly masks the area approximately 20 cm below the probe. Suitable for installations in open environments.

Normal installation:

Designed for scenarios where the material/water level may rise and become very close to, or even contact, the radar antenna — for example, material silos, tanks, etc.

7. Common Troubleshooting

Symptom	Possible Cause and Action
Screen does not light up	Use a multimeter to check whether the voltage is within the 9–26 V range.
Value does not change or jumps erratically	1) Check whether the installation is vertical. 2) Confirm that the measured surface is outside the blind zone (5 cm). 3) Go to “Data Smoothing” and appropriately increase the Change Range (e.g. 15 cm) and Duration (e.g. 30 s), and enable the Sliding-window Filter (e.g. 30).
Displays blind zone or weak echo	There may be false echoes (tank walls, obstacles). Adjust the installation position; go to “Application Configuration” → “Application Algorithm” → enable Nearest Frequency Point.
Measured value is significantly too large	Go to “Calibration Configuration” → “Current Calibration” and use a precision ammeter to calibrate the 4 mA and 20 mA points.
RS485 communication failure	Check whether the A/B wires are reversed; confirm that the baud rate matches the host computer; check that the output signal is set to RS485 mode.
4–20 mA output is inaccurate	Go to “Calibration Configuration” → “Current Calibration” and use a precision ammeter to calibrate the 4 mA and 20 mA points.Use a multimeter to check whether the device’s supply voltage is within 22–26 V.

8. Safety and Precautions

⚠ The supply voltage MUST NOT exceed DC 26 V. Using AC mains power is strictly prohibited.

⚠ Always disconnect the power before wiring and installation.

 

 

 

 

 

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