Krohne DK800/R Variable Area Flowmeter
Overview
The Krohne DK800/R is a compact variable area (VA) flowmeter engineered for monitoring and precisely adjusting extremely small flow rates of gases and liquids. Part of Krohne’s DK46/47/48/800 purgemeter family, the DK800/R uses a stainless steel (R) construction with a glass measuring tube and a free-floating float to give operators a direct visual flow indication without requiring auxiliary electrical power, making it a robust, low-cost solution for sample flow monitoring in analyzer systems, gas chromatographs, and laboratory or pilot-scale process lines.
As the official authorized partner and exclusive regional representative for Krohne in Oman and the GCC, Seven Star LLC proudly supplies the DK800/R variable area flowmeter to petrochemical plants, gas processing facilities, and analytical laboratories across the Sultanate. Every unit shipped from our Muscat-based inventory is genuine Krohne factory stock, fully warranted, and backed by regional application engineering support for sample conditioning system integration.
Measurement Principle
The DK800/R operates on the classic variable area measurement principle. Process fluid flows upward through a tapered glass measuring tube, lifting a free-floating float until the annular gap between the float and the tube wall reaches equilibrium between the upward drag force of the flowing fluid and the downward force of gravity on the float. Because the tube is tapered, the float settles at a vertical position directly proportional to the volumetric flow rate, which is read against a printed analogue scale on the tube — no electronics, signal conditioning, or external power supply are required for basic local indication.
An integrated high-quality needle valve, located in either the foot or head piece depending on configuration, allows fine metering adjustment of very small liquid and gas volumes directly at the point of measurement. Because the flowmeter has no wearing electronic components and relies purely on mechanical float displacement, it delivers stable, repeatable readings over long service intervals with minimal risk of drift, and its transparent glass tube gives operators an immediate visual confirmation of flow presence and rate without needing to consult a remote display.
Engineering Design of the Krohne DK800/R
The DK800/R features a 125 mm measuring tube length housed in a stainless steel R-version body with a 1/4 inch NPT process connection, a standard armature configuration with a measuring glass free of internal contact points, and FPM gaskets paired with FPM/PTFE valve gaskets for broad chemical compatibility. The bottom-mounted needle valve is standard on the R version, giving operators direct manual control of the metered flow rate at the point of installation.
Panel-mounting blinds and support brackets are available for integration into purge panels, gas chromatograph sample conditioning racks, or dedicated instrument panels, and a laboratory support option converts the DK800/R into a freestanding desktop unit for bench-top testing and calibration work. The instrument’s maximum measuring error is rated at ±1, ±2.5, or ±4% of full scale depending on configuration (per VDI/VDE 3513-2), and the flowmeter carries SIL 2 capability for use in safety instrumented systems, with redundant 1oo2 configurations supporting SIL 3 applications.
Key Features
The Krohne DK800/R variable area flowmeter combines mechanical simplicity with precision low-flow measurement capability:
- Measures extremely low flow rates from ≥0.04 l/h for liquids and ≥5 Nl/h for gases with direct visual indication.
- Requires no auxiliary electrical power, making it ideal for remote or hazardous sample points.
- Features an integrated high-quality needle valve for fine metering of very small volumes.
- Constructed with stainless steel R-version fittings and FPM/PTFE gaskets for broad chemical compatibility.
- Operates across a wide temperature and pressure envelope from –5°C to +100°C and up to 10 barg.
- Supports SIL 2 applications independently, and SIL 3 in redundant 1oo2 configuration.
- Offers panel-mount blinds and laboratory support conversion for flexible installation.
- Delivers stable, drift-free readings with no wearing parts or scheduled electronic recalibration.
Industrial Applications
The DK800/R is widely used for sample flow monitoring in gas chromatographs and process analyzer systems, where a stable, verifiable purge or sample gas flow rate is essential for accurate downstream analysis. It is equally suited to laboratory and pilot-plant installations measuring small liquid or gas volumes, purge gas monitoring on instrument panels, and low-flow verification points in petrochemical, refining, and gas processing facilities.
As the officially authorized partner for Krohne in Oman and the GCC, Seven Star LLC distributes the DK800/R to EPC contractors, refineries, and analytical laboratories throughout Muscat, the Sohar and Salalah economic zones, and the wider Sultanate of Oman. Our authorized status ensures every DK800/R shipped is genuine Krohne factory stock with full documentation for SIL-rated safety instrumented system applications.
Technical Specifications
The table below summarizes the key operating parameters of the Krohne DK800/R variable area flowmeter:
| Parameter | Specification |
|---|---|
| Model | Krohne DK800/R |
| Measurement Principle | Variable area (floating element) |
| Minimum Flow (Liquid) | ≥0.04 l/h (≥0.1 GPH) |
| Minimum Flow (Gas) | ≥5 Nl/h (0.22 SCFH) |
| Body Material | Stainless steel (R version) |
| Process Connection | 1/4 inch NPT (G thread available on request) |
| Temperature Range | –5°C to +100°C (+23°F to +212°F) |
| Pressure Rating | Up to 10 barg / 145 psig |
| Accuracy | ±1 / ±2.5 / ±4% of full scale (VDI/VDE 3513-2) |
| Valve | Integrated needle valve, bottom-mounted (standard) |
| Safety Rating | SIL 2 (single); SIL 3 in redundant 1oo2 configuration |
Call To Action
Seven Star LLC maintains regional warehouse stock of the Krohne DK800/R variable area flowmeter for immediate dispatch across Oman and the GCC. Contact our instrumentation division for a formal RFQ, a technical datasheet download, or application engineering support for your sample conditioning or low-flow measurement project. As the authorized partner for Krohne in Oman and the GCC, Seven Star LLC guarantees genuine factory stock, full manufacturer warranty, and local technical support that unauthorized resellers cannot offer.
Seven Star LLC keeps the Krohne DK800/R in regional stock across Oman, ensuring plants can replace or add a Krohne DK800/R purgemeter to sample conditioning panels without extended lead times. Specify the Krohne DK800/R with confidence knowing genuine factory documentation accompanies every unit.
Plant engineers evaluating the Krohne DK800/R for a new sample flow monitoring point can request a certified data sheet directly from Seven Star LLC.
KROHNE is a world-class manufacturer and supplier of industrial process instrumentation, specializing in high-precision flow and level measurement technologies. At Seven Star LLC, we provide KROHNE's comprehensive portfolio, including electromagnetic flowmeters, ultrasonic flow systems, FMCW radar level transmitters, and advanced temperature and pressure sensors. Engineered to withstand extreme operating temperatures, high pressures, and aggressive media, these devices ensure absolute accuracy and operational safety. By delivering authentic KROHNE instrumentation, Seven Star LLC enables oil and gas, water management, chemical, and power generation sectors across Oman and the GCC to achieve optimal process control and regulatory compliance.
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