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.
Working closely with plant engineers in the region, 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.
With fast quotation turnaround and technical support, 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 direct sourcing 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 |
Request a Quote for Krohne DK800/R Variable Area Flowmeter
Seven Star LLC supplies the Krohne DK800/R variable area flowmeter on request across Oman and the GCC, with lead time confirmed at quotation. 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. With engineering support in Muscat, Seven Star LLC supplies the Krohne DK800/R on request with manufacturer documentation and local technical support.
Seven Star LLC supplies the Krohne DK800/R on request across Oman, so plants can replace or add a purgemeter to sample conditioning panels, with lead time confirmed at quotation. 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.
Related Products
- Datasheet Krohne DK800/R Variable Area Flowmeter Datasheet Download
KROHNE product families on this page
KROHNE names its instruments by measuring principle, which makes a tag list easy to read:- OPTIFLUX and WATERFLUX: electromagnetic flowmeters, such as OPTIFLUX 2300, OPTIFLUX 4300 and WATERFLUX 3070 for water networks
- OPTISONIC and ALTOSONIC: ultrasonic flowmeters, including the inline OPTISONIC 3400, the clamp-on OPTISONIC 6300, the OPTISONIC 7300 for gas and the ALTOSONIC V12 for custody transfer of gas
- OPTIMASS: Coriolis mass flowmeters such as OPTIMASS 1400 and 6400
- H250 M40 and DK800: variable area flowmeters
- OPTIWAVE and OPTIFLEX: radar and guided radar level transmitters
Where KROHNE flowmeters and level transmitters are used
Typical duties in the GCC are produced water and injection water metering, potable water and wastewater networks, fuel gas and sales gas measurement, chemical dosing, and tank level in terminals and process units. Coriolis meters cover mass flow and density on hydrocarbons, while electromagnetic meters need a conductive liquid.Ordering KROHNE instruments: what we need
Send the full type code and serial number from the nameplate, or a clear photo of it. For a new KROHNE flow meter we need line size and flange rating, liner and electrode material for electromagnetic types, fluid, flow range, pressure and temperature, power supply, output and protocol, and the hazardous area approval required. We check the code against KROHNE documentation before quoting and provide the manufacturer's datasheet and certificates on request.Browse KROHNE products by category: Flowmeters, Level Transmitter, Flow Computers.
Reviews
There are no reviews yet.