Servo tank gauging instrument Proservo NMS81

Field of Application :

The Proservo NMS81 is an intelligent tank gauge designed for high-accuracy liquid level measurement in custody transfer and inventory control applications. It is NMi- and PTB-approved and meets international standards such as OIML R85 and API 3.1B.

This model is optimized for tank inventory management, loss control, and provides cost-efficient and safe operation in demanding environments.

Applications :

• Custody transfer measurement of crude oil, gasoline, diesel, petrochemicals, and chemicals
• Tank farms and refineries requiring high-precision level measurement
• LNG/LPG applications with Boil-Off Gas (BOG) compensation
• Interface detection for up to three liquid layers

Technical Specifications :

• Process connection: Flanges
• Temperature range: -200 to +200°C (-328 to +392°F)
• Pressure range: 0 to +25bar (0 to +362psi)
• Maximum measuring range: 47m (154ft)
• Accuracy: ±0.4mm (±0.02")
• Certifications:
  • International explosion protection
  • Custody transfer approvals (NMi, PTB, API MPMS)
  • Overfill prevention (WHG, SIL3)

Key Benefits & Features :

High Safety & Reliability

• Developed according to IEC 61508 (SIL3 in homogeneous redundancy)
• Exceptional accuracy of ±0.4mm (±0.02")
• Reliable measurement of interfaces between up to three liquid layers

Certified for Custody Transfer

• Compliant with OIML R85 and API MPMS
• Meets local and international metrology standards (NMi, PTB, WHG)

Superior Corrosion Resistance

• 316L stainless steel construction for sour applications (e.g., crude oil)

Advanced Compatibility for LNG/LPG Applications

• No influence from dc value or Boil-Off Gas (BOG)
• Ensures precise measurement in cryogenic conditions

Seamless System Integration

• Easy connection to major DCS systems via open communication protocols
• Supports multi-parameter measurement (tank bottom, spot & profile densities)