Abstract: The KROHNE H250 M8 is a compact metal tube variable area flowmeter engineered for space-restricted environments and modular OEM skid systems. This instrument perfectly balances traditional mechanical reliability with modern digital integration requirements. Users can flexibly choose between the M8M model for purely mechanical local indication without power supply, or the M8E model supporting 4...20 mA/HART 7 linear analog output. With a maximum pressure rating of 145 barg, SIL 2 functional safety certification, and global explosion-proof approvals, it serves as the ideal standard solution for monitoring low-flow liquids and gases in chemical, petrochemical, and machinery manufacturing industries.
Quick Selection Guide: If you are searching for a low-flow metal tube rotameter with an ultra-short installation length to embed into compact equipment, supporting either passive mechanical indication or HART remote output, the KROHNE H250 M8 is the standard answer. It saves premium space, handles up to 145 barg pressure, operates from -40°C to +200°C, and natively features SIL 2 functional safety certification.
In modern industrial skid and modular equipment design, installation space is always at a premium. Conventional metal tube variable area flowmeters often present installation hurdles in dense piping layouts due to their bulky housings and large indicators. The KROHNE H250 M8 was specifically developed to eliminate this pain point. Featuring an ultra-short face-to-face length, it drastically reduces vertical and horizontal footprints, allowing engineering teams to easily integrate the device into gas seal panels, chemical dosing skids, or precision spraying systems.
Despite its compact form factor, the H250 M8 makes no compromises on performance. The intelligent M8E electronic version incorporates advanced non-contact, hysteresis-free magnetic sensor technology that precisely captures minute float displacements and converts them into stable digital signals. Furthermore, the meter utilizes a gasket-free, all-metal welded measuring tube design, eliminating potential leak paths to ensure production safety while reducing long-term maintenance costs to a absolute minimum.
| Parameter / Feature | Detailed Engineering Specification |
|---|---|
| Measuring Principle | Variable area float principle (Rotameter) |
| Measurable Media | Liquids, gases, and saturated steam |
| Measurement Accuracy | Meets VDI/VDE 3513-2 standards (±2.5%); or ±2% of full scale |
| Max. Operating Pressure | Standard max. 145 barg / 2102 psig (Higher pressure ratings customizable upon request) |
| Medium Temperature Range | -40°C to +200°C / -40°F to +392°F |
| Turndown Ratio | 10:1 |
| Flow Range (Water) | 10 to 6,300 l/h (5 to 1664 GPH) |
| Flow Range (Air) | 0.7 to 180 m³/h (25 to 111 SCFH) |
| Wetted Materials | 316L Stainless Steel, Hastelloy (Alloy C4/C276), Monel (Alloy 400), Titanium, Super Duplex (6Mo), etc. |
| Nominal Diameter | DN15 to DN25 / 1/2" to 1" |
| Ingress Protection (IP) | IP66 / IP67 (Optional PPS or full stainless steel indicator housing) |
| Signal Outputs & Comms | Passive mechanical pointer, 2-wire 4…20 mA, HART 7 protocol, NAMUR limit switches |
| Functional Safety | SIL 2 certified according to IEC 61508 standards |
To help clarify the selection logic within the KROHNE H250 family, the table below highlights the core differences between the compact M8 and the standard M40 models, allowing you to choose based on space and process parameters:
| Comparison Item | KROHNE H250 M8 (Compact) | KROHNE H250 M40 (Standard / Extended) |
|---|---|---|
| Primary Design Intent | Extreme space saving; best suited for modular OEM skids and analysis cabinets. | Versatile standard model; ideal for regular large-diameter industrial piping and complex processes. |
| Structure & Dimensions | Ultra-short face-to-face length, with optimized indicator depth and width. | Standard modular extended indicator structure, requiring a larger footprint. |
| Diameter Range | DN15 to DN25 (1/2" to 1") | DN15 to DN150 (1/2" to 6") |
| Limit Medium Temp. | Maximum +200°C / +392°F | Maximum up to +400°C / +752°F (with heat indicator extensions) |
| Fieldbus Extensions | Supports 4-20mA, HART 7, and limit switches. | Supports HART 7, Profibus PA, and Foundation Fieldbus. |
Explore our relevant industrial instrumentation ranges and selection guides to optimize your systems configuration:
As an experienced supplier of professional industrial instrumentation, we provide original, factory-fresh KROHNE H250 M8 compact metal tube variable area flowmeters. Our applications engineering team is available to assist you with free sizing calculations, density, and viscosity verifications.
Whether you have technical questions regarding low-flow measurements in OEM skids, require the latest datasheets, or need an official commercial quotation, feel free to contact our service team today!
📧 Email: sales@hanyuzl.com | 🌐 Official Website: hanyuzl.com
