Siemens SITRANS LH100 is a submersible hydrostatic level transmitter designed to measure liquid level based on hydrostatic pressure. Its compact probe design allows direct immersion into the liquid for measurement.
It is specifically designed for use in water and wastewater systems, wells, reservoirs, unpressurized tanks and open vessels. On Siemens’ current product page, LH100 is described with stainless steel housing, ceramic measuring cell, standard 4–20 mA output and a vented cable with integrated moisture filter.
The LH100 product family is configured through the 7MF1572 MLFB / Article Number. Measurement range, cable length, sealing material and explosion protection options are determined by the complete product code.
✔ Hydrostatic principle for submersible level measurement ✔ 7MF1572 MLFB / Article Number family ✔ 2-wire 4–20 mA analog output ✔ Al₂O₃ ceramic measuring cell ✔ Stainless steel 1.4404 / 316L housing ✔ IP68 protection class ✔ Integrated vented cable with moisture filter ✔ Various measurement ranges and cable lengths ✔ ATEX and IECEx options ✔ Potable water approval in suitable configurations ✔ Cable suspension and junction box accessories
| MLFB / Article Number | Measurement Task | Key Feature |
|---|---|---|
| 7MF1572 | Hydrostatic level | Submersible type, 2-wire, 4–20 mA |
| 7MF1572-... | Hydrostatic level | Measurement range, cable length, sealing and Ex options defined by full MLFB |
📌 Important Note: 7MF1572 alone is not a complete order code. Final product selection and technical verification must be based on the full MLFB / Article Number.
Although the base family is 7MF1572, the subsequent characters in the order code define technical options such as:
Measurement range
Cable length
Sealing material
ATEX / IECEx option
Special ranges
Special cable lengths
Siemens documentation lists standard ranges as 0–3, 0–4, 0–5, 0–6, 0–10 and 0–20 mH₂O, with alternatives in ftH₂O and bar.
SITRANS LH100 measures the hydrostatic pressure generated by the liquid column:
Where:
P: Hydrostatic pressure
ρ: Liquid density
g: Gravitational acceleration
h: Liquid height
The measured pressure is converted into an electrical signal and transmitted to the control system via 2-wire 4–20 mA output.
| Parameter | SITRANS LH100 |
|---|---|
| Product family | SITRANS LH100 |
| MLFB family | 7MF1572 |
| Measuring principle | Hydrostatic pressure |
| Measurement type | Submersible level |
| Output | 4–20 mA, 2-wire |
| Measuring cell | Al₂O₃ ceramic |
| Housing | Stainless steel 1.4404 / 316L |
| Protection class | IP68, IEC 60529 |
| Standard ranges | 0–3 … 20 mH₂O |
| Alternative units | ftH₂O / bar |
| Cable | PE-HD, vented |
| Moisture protection | Integrated moisture filter |
| Ex options | ATEX / IECEx |
| Potable water | Approved in suitable versions |
| Accuracy | Typical 0.3% |
💧 Water & Wastewater → Potable water reservoirs, wastewater plants, pumping stations, wells, reservoirs ⚡ Energy & Hydroelectric → Water level monitoring, reservoir applications, auxiliary water systems 🏭 Industrial Tanks → Unpressurized process tanks, open tanks, liquid storage systems 🚢 Other Applications → Shipbuilding, open vessels, well applications
✔ Compact submersible design ✔ IP68 protection for continuous immersion ✔ Ceramic measuring cell ✔ Easy integration with 2-wire 4–20 mA ✔ Multiple ranges and cable lengths ✔ Vented cable with moisture filter ✔ ATEX / IECEx options ✔ Potable water approval in suitable versions
📌 For more demanding hydrostatic applications, Siemens SITRANS LH300 may also be considered. LH300 offers higher ranges and alternative material options.
When commissioning or replacing an LH100 device, the following checks should be performed:
Mechanical installation check
Correct positioning of the transmitter
Cable and connection verification
Power supply check
4–20 mA loop test
Measurement range verification
Liquid density evaluation
Vent cable and moisture filter check
IP68 installation conditions verification
Ex certification requirements check
Cable suspension / mechanical fixation check
| Problem | Possible Cause | Solution |
|---|---|---|
| Incorrect reading | Wrong range / process conditions | Verify MLFB and measurement range |
| Unstable signal | Turbulence / fluctuations | Check installation point and process conditions |
| No 4–20 mA output | Power or wiring issue | Verify loop supply and connections |
| Moisture / condensation | Vent or filter issue | Inspect cable and moisture filter |
| Level mismatch | Density variation | Check liquid density |
| Signal instability | Cable movement | Inspect cable suspension and fixation |
Is SITRANS LH100 a current Siemens product? → Yes, it is still active.
What does 7MF1572 represent? → It is the MLFB base code for the LH100 family.
What output signal does LH100 use? → 2-wire 4–20 mA.
Is LH100 IP68 protected? → Yes, according to IEC 60529.
What ranges are available? → Standard 0–3 to 20 mH₂O, with ftH₂O and bar alternatives.
Can LH100 be used in ATEX/IECEx applications? → Yes, in suitable configurations.
How is the correct product code determined? → By full MLFB / Article Number and Siemens documentation.
Yeşil Grup Enerji, as an independent multi-brand supplier (not an official Siemens distributor), provides:
Model and MLFB verification
Siemens datasheet and documentation checks
Range and configuration analysis
Replacement evaluation
LH100 / LH300 comparison
Spare part sourcing
Application suitability assessment
Global sourcing and RFQ management
International project supply
📧 [email protected] 📞 +90 505 696 61 00 🌐 www.yesilgrupenerji.com
Siemens SITRANS LH100, configured via the 7MF1572 MLFB family, is a submersible hydrostatic level transmitter. With 2-wire 4–20 mA output, Al₂O₃ ceramic cell, stainless steel housing and IP68 protection, it is ideal for water, wastewater, wells, reservoirs and open tank applications.
Different ranges, cable lengths, sealing materials and ATEX/IECEx options allow LH100 to be tailored to application requirements. However, 7MF1572 alone is not sufficient; correct product selection must be based on the full MLFB / Article Number, including range, cable, sealing, Ex option and other configuration details.
Yeşil Grup Enerji is not an official Siemens distributor. As an independent supplier, it supports MLFB verification, documentation checks, application evaluation, replacement analysis, global sourcing and RFQ processes.
Important Note: The correct product family base code for SITRANS LH100 is 7MF1572. It is not a complete order code. For quotations, orders or replacements, the full MLFB / Article Number must be used to verify measurement range, cable length, sealing material, Ex option and other configuration parameters.