Enhance plant safety with KROHNE OPTIFLUX 4400. Featuring SIL 2/3 compliance, automated partial proof testing, and $\pm 0.2\%$ accuracy. Ideal for corrosive chemicals and pulsating flows. Discover advanced diagnostics for IEC 61508 safety loops.
In the 2026 industrial landscape, the OPTIFLUX 4400 stands out as the premier Electromagnetic Flowmeter (EMF) developed according to IEC 61508. It is specifically designed for safety-related applications up to Safety Integrity Level (SIL) 2/3, providing a reliable solution for high-risk chemical dosing and acids measurement.
One of the most significant advantages of the OPTIFLUX 4400 is its automated partial proof testing capability. This allows plant operators to:
Extend the time interval between full proof tests.
Reduce manual labor and maintenance costs.
Increase plant uptime without compromising the safety integrity of your Safety Instrumented Systems (SIS).For high-integrity loops, the OPTIFLUX 4400 is often integrated with [Rosemount 3051S SIL-Certified Pressure Transmitters] to provide a complete safety monitoring solution.
While many EMFs struggle with turbulence, the OPTIFLUX 4400 excels in pulsating and turbulent flow environments. With its improved conductivity measurement, it offers:
Best-in-class fault response time: A diagnostic interval of only 2 minutes.
Chemical Versatility: A wide selection of liners (PFA, PTFE, ETFE) and electrodes to handle corrosive acids and bases.
Accuracy: A measuring error of only $\pm 0.2\%$ of measured value, ensuring long-term stability in dosing applications.
| Parameter | Technical Specification |
| Measurement Principle | Electromagnetic (EMF) |
| Measuring Accuracy | $\pm 0.2\%$ of measured value $\pm 1$ mm/s |
| Repeatability | $\pm 0.1\%$ |
| Turndown Ratio | 1000:1 |
| Minimum Conductivity | $\geq 1 \mu S/cm$ (De-ionized water $\geq 20 \mu S/cm$) |
| Flow Direction | Bi-directional (Forward and Reverse) |
| Parameter | Technical Specification |
| Safety Integrity Level | SIL 2 (Single) / SIL 3 (Redundant configuration) |
| Standard Compliance | IEC 61508 |
| Diagnostic Response | Only 2 minutes (Fault response time) |
| NAMUR Compliance | NE 107 (Diagnostics), NE 43, NE 53, NE 131 |
| Data Integrity | Redundant data storage with Real-Time Clock (RTC) |
| Parameter | Technical Specification |
| Nominal Diameter | DN2.5 to DN2000 (1/10" to 80") |
| Liner Materials | PFA (Standard), PTFE, ETFE, PUR, Hard Rubber |
| Electrode Materials | Hastelloy C, 316L, Tantalum, Titanium, Platinum |
| Max Process Pressure | 40 barg / 580 psig (Higher upon request) |
| Process Temperature | $-40 \dots +180$°C ($-40 \dots +356$°F) |
| Ambient Temperature | $-40 \dots +60$°C (up to $+65$°C with optional fan) |
| Parameter | Technical Specification |
| Analogue Output | 4…20 mA (HART® 7 compliant) |
| Discrete Outputs | Pulse, Frequency, Status (Configurable) |
| Grounding | Virtual Reference (Optional, eliminates grounding rings) |
| Verification Tool | Compatible with OPTICHECK Master / DTM |
Selecting the right EMF for an SIS loop requires attention to the media chemistry:
For Aggressive Acids: Choose PFA or PTFE liners with Tantalum or Hastelloy electrodes.For the precise dosing of chemical additives or inhibitors alongside your main acid line, the [KROHNE H250 M40 Rotameter] serves as a robust, all-metal secondary measurement tool.
For Abrasive Slurries: Hard Rubber or ETFE liners provide superior wear resistance.
For Hazardous Areas: Ensure the ATEX/IECEx db eb configuration is selected for Zone 1 or Zone 2 installations.
Virtual Reference Grounding: In non-SIL applications, utilize the "virtual reference" option to save costs on grounding rings. However, for SIL 2/3 loops, follow the specific grounding instructions in the Safety Manual to ensure signal integrity.
Flow Direction: Vertical installation with upward flow is highly recommended to ensure the pipe remains full and to prevent sediment buildup on electrodes.
Straight Runs: Ensure a minimum of $5D$ upstream and $2D$ downstream to minimize turbulent flow interference.For installations with extremely limited space where these straight runs are impossible, the [Rosemount 3051SFC Conditioning Orifice Flow Meter] is a specialized alternative designed to maintain accuracy in tight piping configurations.
The OPTIFLUX 4400 is compatible with the OPTICHECK Master and OPTICHECK DTM service tools.
Full On-site Verification: Conduct a complete check without process interruption.
Partial Proof Test Documentation: Automatically generate documentation compliant with IEC 61508, essential for safety audits and regulatory inspections.
Real-time Diagnostics: The meter detects gas bubbles, electrode deposits, and disturbed flow profiles according to NAMUR NE 107.
Q: Why is Automated Partial Proof Testing (PPT) important for SIL 2 loops?
A: PPT allows operators to verify the flowmeter's safety function without a full shutdown. It extends the interval between mandatory full proof tests, significantly increasing plant uptime and reducing maintenance costs in Safety Instrumented Systems (SIS).
Q: How does the OPTIFLUX 4400 handle corrosive acids?
A: The meter offers high-performance PFA and PTFE liners combined with chemically resistant electrodes like Tantalum or Hastelloy C. This makes it ideal for measuring aggressive chemicals and acids in the process industry.
Q: Can the OPTIFLUX 4400 be used in pulsating flow conditions?
A: Yes. Unlike standard EMFs, the OPTIFLUX 4400 features advanced signal processing and a fast 2-minute diagnostic interval, ensuring stable and high-accuracy measurement ($\pm 0.2\%$) even in turbulent or pulsating flow environments.
