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7MB2121-0CA00-1AA1

The Siemens 7MB2121-0CA00-1AA1 is a motor protection relay from Siemens' SIPROTEC 7MB series, specifically designed for protecting low-voltage motors in industrial and commercial applications. The relay offers comprehensive motor protection, monitoring, and control functions to ensure safe operation of motors, preventing damage from electrical faults, overloads, and other hazardous conditions. It provides reliable and effective protection in various sectors, including oil and gas, mining, power generation, and automated manufacturing systems.

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TEL：400-887-3214
Mail：jilineasyyi@outlook.com
Q Q：615739355
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Key Features
✔ Non-intrusive measurement - No pipe cutting or process shutdown required
✔ Bidirectional flow measurement with ±1% accuracy
✔ HART/Modbus/PROFIBUS PA communication protocols
✔ IP68/NEMA 6P rated for harsh environments
✔ Intrinsic safety options (ATEX/IECEx certified)

3. Technical Specifications
3.1 Measurement Performance

Parameter Specification
Pipe Diameter Range 15-6000mm
Velocity Range 0.01-25m/s
Accuracy ±1% of reading (typical)
Repeatability ±0.15% of reading
Measurement Principle Transit-time ultrasonic
3.2 Process Conditions

Parameter Specification
Fluid Temperature Range -40°C to +200°C
Ambient Temperature -40°C to +70°C
Maximum Pressure 100 bar
Fluid Types Water, chemicals, oils (conductive/non-conductive)
3.3 Electrical Specifications

Parameter Specification
Power Supply 18-36V DC
Output Signals 4-20mA, pulse, frequency
Communication HART 7, Modbus RTU, PROFIBUS PA
Protection Class IP68/NEMA 6P
3.4 Mechanical Specifications

Parameter Specification
Sensor Material PPSU/PVDF (wetted parts)
Housing Material Stainless steel 316L
Weight 2.5kg (transducer pair)
Mounting Clamp-on with mounting kit
4. Ordering Information
Base Unit: 7MB2121-0CA00-1AA1 (Standard configuration)

Options:

7MB2121-0CA00-1AB1 (Explosion-proof version)

7MB2121-0CA00-1AC1 (High-temperature version)

5. Certifications & Approvals
CE Marked

ATEX/IECEx (optional)

SIL 2/3 (optional)

FDA compliant materials (optional)

6. Typical Applications
✔ Water and wastewater treatment
✔ Chemical processing
✔ Oil and gas pipelines
✔ HVAC systems
✔ Food and beverage production