KROHNE DK32/34 Variable Area Flowmeter | Metal Tube Purgemeter for Low Flow

The Global Industry Standard for Reliable Low-Flow Liquid and Gas Measurement

The KROHNE DK32/34 is a premier mechanical variable area flowmeter engineered for high-precision monitoring of low-flow liquids and gases. Built with a heavy-duty all-metal measuring tube, this resilient rotameter delivers stable process indication where standard glass tubes fail. Operating flawlessly at extreme pressures up to 220 barg (3190 psig) and temperatures up to +200°C (+392°F), the KROHNE DK32/34 serves as a dependable, zero-power local indicator for mission-critical industrial processes worldwide.

High-Pressure Flow Monitoring for Analyzer Panels and Purge Systems

In analytical engineering and chemical refining, maintaining an uninterrupted, precise sample flow to process instrumentation is paramount. The KROHNE DK32/34 series excels in sample flow monitoring, utilizing an integrated micro-metering needle valve for smooth and fine flow rate adjustments. For process lines subjected to volatile pressure spikes, the flowmeter can be factory-configured with mechanical differential pressure regulators to secure constant dosing accuracy.

To establish absolute diagnostic oversight across analyzer conditioning skids, systems engineers frequently position this purgemeter alongside a Rosemount 3051S Pressure Transmitter at the skid intake, combining physical local metering with remote electronic alarms.

Technical Specifications: KROHNE DK32/34

Measurement Performance

Operating Limits & Materials

Model Comparison: KROHNE DK32 vs. DK34

Understanding the mechanical differences between the two variations ensures a seamless alignment with your structural piping layout:

Typical Industrial Applications

• Analytical Systems: Reliable sample flow monitoring for industrial gas chromatographs and toxic gas analyzers.
• Purging & Inertization: Fine-tuned nitrogen gas monitoring for mechanical seal systems, vessels, and protective enclosures.
• Chemical Skids: High-pressure injection control for anti-corrosive agents, catalysts, and additives in oil and gas processing.
• Laboratories: Low-flow liquid dosing and carrier gas regulation within heavy chemical research facilities.

System Engineering & Selection Guide

• Mitigating Pressure Variance: In modular analyzer lines, adjacent hardware cycling can create pressure drop-offs. Always specify the optional internal mechanical differential pressure regulator to isolate the flowmeter and prevent measurement drift.
• Preventing Trace Component Adsorption: When tracking sulfur components or moisture at parts-per-billion (ppb) thresholds, standard steel wetted parts can trap molecules. Integrating the optional SilcoNert®2000 surface passivation guarantees a chemically inert internal boundary, protecting the validity of downstream gas analysis.
• Eliminating Upstream Space Demands: Operating independently of flow velocity profiles, the KROHNE DK32/34 handles process fluid with zero straight inlet or outlet pipe runs (0D/0D). Isolating valves or elbows can be bolted directly to the connections, achieving massive footprint savings in OEM cabinets.

Frequently Asked Questions (FAQ)

Q: Does the KROHNE DK32/34 require electrical power to show the flow rate?
A: No. The standard KROHNE DK32/34 is a fully mechanical variable area flowmeter. It operates purely on fluid dynamics, utilizing a magnetic coupling system to move the local dial pointer, providing uninterrupted fail-safe local metering without power cables.

Q: How does the welded construction of the DK34 alter chemical reliability?
A: Unlike the DK32, which relies on elastomer gaskets at the process connections, the DK34 features an all-welded wetted assembly option. This minimized leak path design provides extreme structural safety for hazardous, toxic, or high-purity gas distributions.

Q: Can I integrate the mechanical DK32/34 series into a modern DCS network?
A: Yes. While the base models are purely visual, the series can be configured with discrete NAMUR or Reed limit switches for automated flow threshold alarms, or upgraded with a 2-wire 4-20mA/HART transmitter for continuous electronic data logging.

Related Instrumentation Solutions

Optimize your processing skids and pipelines by pairing the DK32/34 with our complementary technical solutions:

• Advanced Electronic Purgemeters: For applications requiring digital bargraph visuals and tight accuracy ratings, learn more about the KROHNE DK37 M8 Variable Area Flowmeter.
• Full-Bore Spatial Efficiency: For compact bulk liquid metering requiring similar zero-diameter runs, explore the KROHNE WATERFLUX 3400 Electromagnetic Flowmeter.
• Medium-to-High Process Volumes: For large-scale chemical dosing lines beyond low-flow capabilities, review the rugged wetted boundaries of the KROHNE H250 M8 Metal Rotameter.