Siemens SITRANS Probe LU (HART) Ultrasonic Level Transmitter

Siemens SITRANS Probe LU is a two-wire loop powered ultrasonic transmitter designed specifically for industrial scenarios, capable of accurately measuring the liquid level, volume, and flow rate in storage tanks, process vessels, and open channels.

• Integrates an internal temperature sensor, which can compensate for temperature changes in real time.
• Adapts to various chemical environments such as ETFE and PVDF.
• Equipped with mature Sonic Intelligence ® Signal processing technology to effectively distinguish between real echoes and false echoes, ensuring measurement stability.
• Supports HART communication protocol and SIMATIC ® PDM software, compatible with various programming methods such as handheld programmers and PC debugging software, providing flexible and convenient operation.

• Process Connection: 2" NPT, BSP, G and other threaded interfaces, as well as 3" universal flange options.
• Shell Body Material: PBT.
• End Cap Material: Hard coated PEI.
• Protection Level: IP67/IP68, in compliance with NEMA 4X/6 standards.
• Working Environment Temperature: -40 to +80 ℃.
• Process Temperature: -40 to +85 ℃.
• Maximum Working Pressure: 0.5bar g.
• Maximum Altitude: 5000m.

• The equipment has passed multiple certifications such as CE, FM, CSA, ATEX, etc.
• The intrinsic safety model is suitable for hazardous areas and meets industrial safety regulations.

1. Ensure that the surface of the transmitter is at least 300mm above the highest level.
2. The sound path is perpendicular to the material surface.
3. Avoid obstacles such as high-voltage cables, variable frequency motor controllers, and welding seams, hooks, and loops inside the container.
4. The wiring adopts shielded twisted pair cables with wire specifications ranging from AWG 22 to AWG 14.
5. The cables are connected to the corresponding terminals after passing through the gland, and the gland is tightened to ensure sealing.
6. The torque of the cover plate screws is controlled between 1.1-1.7N-m.
7. Certified safety barriers should be used for installation in hazardous areas, following corresponding wiring specifications.
8. Dust and waterproof conduit seals should be used for outdoor installation.

The device operation is divided into RUN mode and GRAM mode. After power on, it automatically enters RUN mode to detect the material level. GRAM mode can be activated through a handheld programmer or remote software for parameter configuration.

The core settings include:

• Measurement mode selection (level, interval, distance).
• Response time adjustment.
• Measurement unit setting.
• Empty level and range calibration.
• The automatic false echo suppression function can be enabled through P837 and P838 parameters to ignore interference signals generated by obstacles.
• The parameter locking function can be achieved through the combination of P000 and P069 to prevent misoperation.
• The main station reset (P999) can restore user parameters to default settings (except for P000 and P069).

In terms of maintenance, the equipment does not require regular cleaning and maintenance. Troubleshooting can refer to the fault code prompts. Common problems include echo loss, power supply abnormalities, and invalid parameter configurations, which can be solved by checking the installation position, wiring status, calibration range, and other methods.

If there is a hardware failure or parameter loss, it is necessary to contact authorized Siemens maintenance personnel for handling. Replacement components should use original factory parts to avoid affecting equipment safety and measurement accuracy.

• The device is widely used in storage containers, mixing process containers, open channels and other scenarios.
• Supports volume calculation of various container shapes.
• Through 32 breakpoint parameters, the conversion between pressure head and flow rate can be achieved, meeting the measurement needs of different industrial processes.

It is a reliable and comprehensive level measurement solution.