---
title: "Emerson Rosemount 5900S Radar Tank Level Gauge"
description: "Metrology-certified FMCW non-contact radar level gauge delivering ±0.5 mm instrument accuracy for custody transfer and inventory management in bulk storage terminals."
canonical_url: "https://nodewave.net/store/instrumentation/rosemount-5900s"
last_updated: "2026-10-04T04:04:55.514Z"
---

<note>

The **Rosemount 5900S Radar Level Gauge** is Emerson's flagship non-contact tank gauging solution. Certified to **OIML
R85** metrological standards with an instrument accuracy of **±0.5 mm\pm 0.5\text{ mm}±0.5 mm** (<span className="katex">
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), it serves
as the benchmark for fiscal custody transfer and high-value bulk liquid inventory management.

</note>

## Executive Summary and Core Capabilities

Engineered specifically for bulk storage terminals, refineries, and chemical tank farms, the Rosemount 5900S provides
non-contact measurement across all liquid types—ranging from crude oil and refined fuels to liquefied gases (LPG/LNG)
and bitumen.

By operating via a 2-wire intrinsically safe Tankbus, the gauge integrates seamlessly into comprehensive tank gauging
systems alongside multi-spot temperature devices and pressure transmitters for precise net volume calculation.

<callout color="green" icon="i-lucide-shield-check">

**2-in-1 Redundant Overfill Protection:** The 5900S offers an innovative 2-in-1 configuration containing two independent
radar elements within a single enclosure. This enables a single tank nozzle to serve simultaneously as a SIL 2/3 basic
process control level sensor and an independent Safety Instrumented System (SIS) overfill alarm.

</callout>

<accordion>
<accordion-item icon="i-lucide-gauge" label="High-Precision Metrology & Signal Processing">

- **Sub-Millimeter Precision:** Delivers <span className="katex">
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0.5

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 instrument accuracy with thermal stability
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.
- **Low Loss Mode Array Technology:** The still-pipe array antenna uses specialized microwave signal focusing to
eliminate signal distortion caused by rust or product buildup on interior pipe walls.
- **Fast Dynamic Tracking:** A new measurement sample is taken every <span className="katex">
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, providing real-time level
tracking during high-rate tank filling or emptying.
:::

<accordion-item icon="i-lucide-cpu" label="Safety and System Integration">

- **API 2350 Compliance:** Fully supports automated overfill prevention standards with SIL 2 and SIL 3 certifications
according to IEC 61508.
- **Legacy System Emulation:** Emulates communication protocols of third-party legacy tank gauges (such as Enraf, Varec,
and L&J), enabling step-by-step terminal modernization without laying new cabling.

</accordion-item>
</accordion-item>
</accordion>

---

## Technical Specifications Matrix

<tabs>
<tabs-item label="Measurement Accuracy and Metrology">
<table>
<thead>
  <tr>
    <th align="left">
      Specification
    </th>
    
    <th align="left">
      Technical Value
    </th>
  </tr>
</thead>

<tbody>
  <tr>
    <td align="left">
      <strong>
        Instrument Accuracy
      </strong>
    </td>
    
    <td align="left">
      <span className="katex">
        <span className="katex-mathml">
          <math xmlns="http://www.w3.org/1998/Math/MathML">
            <semantics>
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                  ±
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                  0.5
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                  mm
                </mtext>
              </mrow>
              
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                \pm 0.5\text{ mm}
              </annotation>
            </semantics>
          </math>
        </span>
        
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            </span>
            
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              ±
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              0.5
            </span>
            
            <span className="mord,text">
              <span className="mord">
                mm
              </span>
            </span>
          </span>
        </span>
      </span>
      
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            </span>
            
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              </span>
            </span>
          </span>
        </span>
      </span>
      
      )
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Metrological Certification
      </strong>
    </td>
    
    <td align="left">
      OIML R85:2008, NMi, PTB
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Measuring Range
      </strong>
    </td>
    
    <td align="left">
      <span className="katex">
        <span className="katex-mathml">
          <math xmlns="http://www.w3.org/1998/Math/MathML">
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                  m
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              </mrow>
              
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              </annotation>
            </semantics>
          </math>
        </span>
        
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            </span>
            
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                m
              </span>
            </span>
          </span>
        </span>
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      ) standard
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Repeatability / Stability
      </strong>
    </td>
    
    <td align="left">
      Typically <span className="katex">
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            <span className="mord,text">
              <span className="mord">
                mm
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            </span>
          </span>
        </span>
      </span>
      
       from <span className="katex">
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        </span>
      </span>
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Update Time
      </strong>
    </td>
    
    <td align="left">
      Every <span className="katex">
        <span className="katex-mathml">
          <math xmlns="http://www.w3.org/1998/Math/MathML">
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                  seconds
                </mtext>
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                0.3\text{ seconds}
              </annotation>
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            </span>
            
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            <span className="mord,text">
              <span className="mord">
                seconds
              </span>
            </span>
          </span>
        </span>
      </span>
    </td>
  </tr>
</tbody>
</table>
</tabs-item>

<tabs-item label="Hardware Architecture and Antenna Options">
<table>
<thead>
  <tr>
    <th align="left">
      Hardware Feature
    </th>
    
    <th align="left">
      Specification Details
    </th>
  </tr>
</thead>

<tbody>
  <tr>
    <td align="left">
      <strong>
        Antenna Configurations
      </strong>
    </td>
    
    <td align="left">
      Parabolic Antenna, Still-Pipe Array Antenna, Horn Antenna, LPG/LNG Antenna
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Redundancy Option
      </strong>
    </td>
    
    <td align="left">
      2-in-1 Dual Radar Gauge (Independent Primary Level + Safety Overfill)
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Enclosure Construction
      </strong>
    </td>
    
    <td align="left">
      Polyurethane-coated die-cast aluminum (IP66 / IP67 / NEMA 4X)
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Process Pressure Range
      </strong>
    </td>
    
    <td align="left">
      Full vacuum up to <span className="katex">
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       for LPG/LNG
    </td>
  </tr>
</tbody>
</table>
</tabs-item>

<tabs-item label="Communications and Electrical">
<table>
<thead>
  <tr>
    <th align="left">
      Communication Parameter
    </th>
    
    <th align="left">
      Specification Details
    </th>
  </tr>
</thead>

<tbody>
  <tr>
    <td align="left">
      <strong>
        Bus Topology
      </strong>
    </td>
    
    <td align="left">
      2-wire Intrinsically Safe Tankbus (FOUNDATION Fieldbus based)
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Power Input
      </strong>
    </td>
    
    <td align="left">
      <span className="katex">
        <span className="katex-mathml">
          <math xmlns="http://www.w3.org/1998/Math/MathML">
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                </mtext>
                
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                </mn>
                
                <mtext>
                  VDC
                </mtext>
              </mrow>
              
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            <span className="mord">
              17.5
            </span>
            
            <span className="mord,text">
              <span className="mord">
                VDC
              </span>
            </span>
          </span>
        </span>
      </span>
      
       (FISCO) / <span className="katex">
        <span className="katex-mathml">
          <math xmlns="http://www.w3.org/1998/Math/MathML">
            <semantics>
              <mrow>
                <mn>
                  9.0
                </mn>
                
                <mtext>
                  to
                </mtext>
                
                <mn>
                  30.0
                </mn>
                
                <mtext>
                  VDC
                </mtext>
              </mrow>
              
              <annotation encoding="application/x-tex">
                9.0\text{ to }30.0\text{ VDC}
              </annotation>
            </semantics>
          </math>
        </span>
        
        <span className="katex-html" ariaHidden="true">
          <span className="base">
            <span className="strut" style="height:0.6833em;">
              
            </span>
            
            <span className="mord">
              9.0
            </span>
            
            <span className="mord,text">
              <span className="mord">
                to
              </span>
            </span>
            
            <span className="mord">
              30.0
            </span>
            
            <span className="mord,text">
              <span className="mord">
                VDC
              </span>
            </span>
          </span>
        </span>
      </span>
      
       (Entity)
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Safety Certification
      </strong>
    </td>
    
    <td align="left">
      Certified SIL 2 / SIL 3 capable (IEC 61508)
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Protocol Emulation
      </strong>
    </td>
    
    <td align="left">
      Enraf, Varec Mark/Space, L&J Tankway, Whessoe, GPE, Tokyo Keiso
    </td>
  </tr>
</tbody>
</table>
</tabs-item>
</tabs>

---

## Target Industry Applications

<card-group>
<card icon="i-lucide-ship" title="Marine Terminal Custody Transfer">

Provides OIML R85 certified sub-millimeter measurements for fiscal product transfers between tank farms and ships.

</card>

<card icon="i-lucide-snowflake" title="LPG / LNG Cryogenic Tank Storage">

Dedicated pressurized LPG/LNG antenna designs measure liquid gas inventory through full containment tank structures.

</card>
</card-group>

---

## External Resources and Documentation

Access official software, datasheets, and manuals directly from Emerson:

<card-group>
<card icon="i-lucide-external-link" title="Official Rosemount 5900S Product Page" target="_blank" to="https://www.emerson.com/en/measurement-instrumentation/products/rosemount-5900s-radar-level-gauge">

View complete specifications, download technical documentation, and request quotes on Emerson's website.

</card>

<card icon="i-lucide-book-open" title="Emerson Tank Gauging Systems Overview" target="_blank" to="https://www.emerson.com/en-us/automation/brands/rosemount/tank-gauging-system">

Explore integrated tank inventory management systems, temperature sensors, and TankMaster software.

</card>
</card-group>