🛠️ Siemens SITRANS LH300 Hydrostatic Level Transmitter: 7MF1575, 4–20 mA, IP68, Submersible Level Measurement

🎯 Strategic Importance

The Siemens SITRANS LH300 is a hydrostatic submersible level transmitter designed for continuous liquid level measurement. Its compact probe design allows direct immersion into the liquid, enabling hydrostatic pressure-based level measurement in open tanks, channels, wells, reservoirs and similar applications.

SITRANS LH300 is suitable not only for water and wastewater but also for drinking water, seawater, corrosive environments and deep wells. Siemens defines LH300 with a ceramic measuring cell, corrosion-resistant construction, 4–20 mA output and IP68 protection.

The LH300 product family is listed in the Siemens catalog under 7MF1575- MLFB / Article Number. For example, Siemens Industry Mall lists 7MF1575-1AA10-Z C11 as SITRANS LH300, with product lifecycle marked as Active Product.

📌 Therefore, relying only on the base code 7MF1575 is not sufficient. For quotation, ordering or replacement, the full MLFB / Article Number must be checked together with Siemens documentation.

🔧 Key Features

✔ Hydrostatic principle for submersible level measurement ✔ 7MF1575- MLFB / Article Number family ✔ 2-wire 4–20 mA analog output ✔ Al₂O₃ ceramic measuring cell (99.6% purity) ✔ Stainless steel and protective material options ✔ IP68 protection class ✔ Integrated vented cable with moisture filter ✔ Standard ranges up to 40 mH₂O / 4 bar ✔ Special ranges up to 16 bar ✔ Various cable lengths ✔ ATEX and IECEx options ✔ Drinking water approvals available ✔ Marine configurations available ✔ Accessories such as cable suspension and junction box

🔎 Product Family and MLFB Configurations

MLFB / Article Number	Measurement Task	Key Feature
7MF1575-	Hydrostatic level	Submersible type, 2-wire, 4–20 mA
7MF1575-...	Hydrostatic level	Range, cable length, material, protective cap and other options defined by full MLFB

📌 Important Note: 7MF1575- alone is not a complete order code. Final product selection must be based on the full MLFB / Article Number.

📑 MLFB and Configuration Selection

When ordering, the following parameters must be considered:

Measurement range
Cable length
Cable material / type
Measuring cell and wetted materials
Protective cap option
Sealing material
ATEX / IECEx option
Approvals for drinking water or marine use
Special ranges
Special cable lengths
Factory calibration / quality certificates

📌 Ordering Note: Never determine the product code based on a single parameter. For replacements, always verify the full MLFB / Article Number of the existing device.

⚙️ Operating Principle

P=ρ×g×h

Where:

P: Hydrostatic pressure
ρ: Liquid density
g: Gravitational acceleration
h: Liquid height

📌 Importance of Density: Hydrostatic level measurement is directly affected by liquid density.

📊 Technical Specifications

Parameter	SITRANS LH300
Product family	SITRANS LH300
MLFB family	7MF1575-
Measuring principle	Hydrostatic pressure
Measurement type	Submersible level
Output	4–20 mA, 2-wire
Measuring cell	Al₂O₃ ceramic (99.6% purity)
Housing	Stainless steel
Protection class	IP68
Standard ranges	Up to 40 mH₂O / 4 bar
Special ranges	Up to 16 bar
Accuracy	Typical 0.15%
Ex options	ATEX / IECEx
Drinking water	Available in suitable versions
Marine applications	Available in suitable versions

🏭 Industrial Applications

💧 Water & Wastewater → Drinking water reservoirs, wastewater plants, pumping stations, wells, reservoirs 🌊 Seawater → Corrosion-resistant level measurement points ⚡ Energy & Hydropower → Reservoir monitoring, hydropower systems 🏭 Industrial Tanks → Non-pressurized process tanks, open tanks, storage systems 🕳️ Deep Wells → Channels, dams, open structures 🚢 Marine → Ships and marine applications (suitable configurations)

⚡ Operational Advantages

✔ Compact submersible design ✔ IP68 continuous immersion protection ✔ Ceramic measuring cell ✔ Easy integration with 2-wire 4–20 mA ✔ Standard ranges up to 40 mH₂O / 4 bar ✔ Special ranges up to 16 bar ✔ Vented cable with moisture filter ✔ Corrosion-resistant material options ✔ ATEX / IECEx certified variants ✔ Drinking water and marine approvals

🔧 Commissioning

Mechanical installation check
Correct positioning of the transmitter
Range verification against process requirements
Cable and electrical connection check
Power supply verification
4–20 mA loop test
Liquid density evaluation
Vent line and moisture filter check
IP68 installation conditions verification
Ex certification requirements check
Cable suspension and mechanical fixation check

⚠️ Troubleshooting

Problem	Possible Cause	Solution
Incorrect reading	Wrong range / process conditions	Verify MLFB and measurement range
Unstable level	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 line or filter issue	Inspect cable and moisture filter
Level mismatch	Density variation	Check liquid density
Signal instability	Cable movement	Inspect cable suspension and fixation
Unexpected reading	Mounting reference issue	Verify installation position and reference level

❓ Frequently Asked Questions

Is SITRANS LH300 a current Siemens product? → Yes, listed as active under 7MF1575- family.
What does 7MF1575 represent? → MLFB base family for LH300, not a complete order code.
What output signal does LH300 use? → 2-wire 4–20 mA.
Is LH300 IP68 protected? → Yes, according to IEC 60529.
What ranges are available? → Standard up to 40 mH₂O / 4 bar, special up to 16 bar.
What measuring cell does LH300 use? → Al₂O₃ ceramic, 99.6% purity.
Can LH300 be used in ATEX/IECEx applications? → Yes, suitable configurations available.
Is LH300 suitable for drinking water? → Yes, approved versions exist.
Can LH300 be used in seawater? → Yes, marine-approved configurations available.
How is the correct product code determined? → By full MLFB / Article Number, not just the base family.

🌍 Global Supply and Technical Support

Yeşil Grup Enerji is not an official Siemens distributor. As an independent multi-brand supplier, it provides project-based technical and procurement support for SITRANS LH300.

Services Provided:

Model and MLFB verification
Siemens datasheet and documentation checks
Range and configuration analysis
Cable length and application evaluation
Ex / certification compliance checks
Replacement evaluation
LH100 / LH300 comparison
Spare parts sourcing
Application suitability assessment
Global sourcing
Fast RFQ management
International project supply

📧 [email protected] 📞 +90 505 696 61 00 🌐 www.yesilgrupenerji.com

🔍 Key Considerations for LH300 Selection

Parameter	Importance
Full MLFB / Article Number	Defines final configuration
Measurement range	Determines level suitability
Cable length	Depends on well/tank depth
Cable type / material	Must match environment conditions
Sealing material	Must match process fluid and conditions
Protective cap	Important for water, wastewater, seawater, corrosive environments
Ex option	Required for hazardous areas
Drinking water / marine approval	Required for certified projects
Liquid density	Directly affects hydrostatic measurement
Mounting method	Ensures stability and reliability

📌 RFQ Note: For replacement or new projects, always

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🔍 Key Considerations for LH300 Selection

Parameter	Importance
Full MLFB / Article Number	Defines the final product configuration
Measurement range	Determines level suitability and application compatibility
Cable length	Must match well, tank or reservoir depth
Cable type / material	Critical for environmental and process conditions
Sealing material	Must be compatible with process fluid and temperature/chemical conditions
Protective cap	Important for water, wastewater, seawater or corrosive environments
Ex option	Required for hazardous area applications
Drinking water / marine approval	Necessary for certified projects and facilities
Liquid density	Directly affects hydrostatic measurement accuracy
Mounting method	Ensures measurement stability and mechanical reliability

📌 RFQ Note: For replacement or new project quotations, sharing the full MLFB / Article Number of the existing device significantly simplifies correct configuration selection.

🆚 SITRANS LH100 vs LH300 Comparison

Feature	SITRANS LH100	SITRANS LH300
Product type	Submersible hydrostatic level transmitter	Submersible hydrostatic level transmitter
MLFB family	7MF1572	7MF1575-
Output	4–20 mA	4–20 mA
Measuring cell	Ceramic	Al₂O₃ ceramic
Protection	IP68	IP68
Application focus	Standard level applications	More demanding level applications
Deep well / high range	Limited, configuration-dependent	Wider range options
Seawater	Limited, configuration-dependent	Marine-approved variants available
ATEX / IECEx	Available in suitable variants	Available in suitable variants
Drinking water	Available in suitable variants	Available in suitable variants

📌 Note: When choosing between LH100 and LH300, evaluation should not be based solely on price. Measurement range, cable length, process fluid, material selection, certification and site conditions must all be considered together.

✅ Conclusion

The Siemens SITRANS LH300, configured under the 7MF1575- MLFB / Article Number family, is a submersible hydrostatic level transmitter designed for continuous liquid level measurement. According to Siemens’ current product information, LH300 offers 2-wire 4–20 mA output, an Al₂O₃ ceramic measuring cell, IP68 protection, and typical accuracy of 0.15%.

Standard measurement ranges are available up to 40 mH₂O / 4 bar, with special ranges up to 16 bar. Configurations with ATEX/IECEx certification, drinking water approval, and marine approval are also available.

📌 However, 7MF1575- alone is not a complete order code. Correct product selection requires the full MLFB / Article Number, including measurement range, cable length, material options, protective cap, sealing, Ex requirements, approvals and site conditions.

Yeşil Grup Enerji is not an official Siemens distributor. As an independent multi-brand supplier, it provides MLFB verification, documentation checks, application evaluation, replacement analysis, global sourcing and fast RFQ support for SITRANS LH300.

📌 Important Note: The correct product family base code for SITRANS LH300 is 7MF1575-. Siemens Industry Mall lists complete product codes such as 7MF1575-1AA10-Z C11 under LH300. Therefore, for quotations, orders or replacements, verification must always be based on the full MLFB / Article Number, not just the base family.