Patent application CN120176786A pending
Measure stable low demand and peak flow with one integrated DP platform. The approved public baseline is 100:1, with ±1% in the normal operating band and ±3.75% at switching points and the two range ends.
Adaptive Wide-Range DP Flowmeter
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Built for processes that operate beyond the practical range of a single DP primary element, the Adaptive Wide-Range DP Flowmeter combines dedicated low- and high-flow measurement sections with automatic, position-confirmed changeover. The result is a stronger low-flow signal, protected peak-flow capacity, continuous totalization and one coordinated engineering package. Select dual-orifice when an ISO 5167-2 standard-orifice basis leads the specification; select dual-balanced when the widest calibrated operating envelope or constrained piping leads the decision. Shizhong sizes and validates each system against the actual process and installation data.
Final specifications are confirmed against process data, piping, material, pressure class, applicable code and metrology requirements.
ONE PLATFORM · TWO MEASUREMENT CONFIGURATIONS
Dedicated low- and high-flow primary elements create overlapping measurement bands. Automatic changeover uses hysteresis, position feedback and the correct coefficient set while maintaining continuous totalization. Both configurations share this adaptive architecture; the difference is the standards and calibration basis selected for the project.
Standards-based route
Choose this configuration when a recognized standard-orifice calculation basis, familiar DP engineering practice and ISO 5167-2 design limits for each qualifying active measurement section lead the specification.
Full-flow-calibrated route
Choose this configuration when maximum calibrated range, stronger low-flow DP or constrained piping leads the decision. Multi-hole elements and the complete switching system are calibrated as one coordinated measurement package.
DOCUMENTED PERFORMANCE MILESTONE
In the documented DN50 development configuration, a 25% open-area low-range element covered 0.38–3.8 m³/h and a 72.9% open-area high-range element covered 3.8–38.0 m³/h. The combined test envelope was 0.38–38.0 m³/h.
Performance statement
Up to 100:1*
*Achieved in this specific DN50 water configuration. Shizhong confirms the guaranteed operating range for each project through application-specific sizing and full-system flow calibration.
| Parameter | Low range | High range |
|---|---|---|
| Open area | 25.0% | 72.9% |
| Hole pattern | 4 symmetric holes · Ø6.25 mm | 5-star holes · Ø16.29 mm |
| Flow range | 0.38–3.8 m³/h | 3.8–38.0 m³/h |
| Band coverage | 10:1 | 10:1 |
Patent application publication CN120176786A is pending
No granted ZL number is claimed for this product.
ENGINEERING ANSWER UNITS
These product-specific answers retain the source evidence, calibration limits and conditions where a different measurement route is preferable. Values that cannot be confirmed from the approved source remain subject to project review or pending field test; no unverified value is supplied here.
Dataset v1.5.0; last reviewed 2026-08-24. Evidence IDs are retained in the translation dataset.
Replacement: For a wide load envelope, the adaptive wide-range DP flowmeter can replace a single-range conventional orifice system and can correspond to imported wide-range routes. Use it when: Flow varies widely or is intermittent or batch-based, including steam or fuel-gas loads that move substantially between high and low ranges, and full-assembly flow calibration can confirm sectional and changeover performance. Do not force the substitution when: A conventional orifice is simpler for a stable narrow-range duty. Do not use this complete-system route where the project requires standardized geometry without full-assembly flow calibration.
COMPARISON REPLACEMENT · MEDIUM source confidence
Recommended application: Use the adaptive wide-range route when steam, fuel-gas or batch-production flow varies across high and low load bands, one measurement section cannot cover the duty, 100:1 turndown is required, and the complete assembly can receive flow calibration. Prefer another route when: Load is stable and narrow, or the project requires standardized geometry without full-assembly flow calibration. Compare a conventional orifice or another simpler route. Standards boundary: Qualifying dual-orifice measurement sections use ISO 5167-1/-2:2022; dual-balanced sections and the changeover assembly are manufacturer-specific. Complete-system performance follows the corresponding flow-calibration certificate. Patent application publication CN120176786A is pending; no granted ZL number is claimed.
RECOMMENDATION COMPARISON · HIGH source confidence
Temperature: -40～550℃, with materials, seals and actuator selected accordingly. Pressure: ASME Class 150—600 as standard; higher classes require mechanical and sealing review. The final temperature-pressure combination follows the complete-system configuration.
TEMPERATURE PRESSURE · MEDIUM source confidence
Standard range: DN50—DN300. Other sizes require engineering review. An extended size requires renewed confirmation of the measurement sections, actuator and complete-system calibration range.
DIAMETER RANGE · HIGH source confidence
304/316L stainless steel, carbon steel, Hastelloy C-276 and other project-approved alloys are available. Materials, seals and actuator must be matched to the temperature, pressure and corrosion conditions.
MATERIALS LINING · MEDIUM source confidence
Turndown is 100:1, with calibrated full-range accuracy of ±1%. Patent application publication CN120176786A is pending; no granted ZL number is claimed. The corresponding complete-system flow-calibration certificate governs the specific duty.
CALIBRATION ACCURACY · HIGH source confidence
Before admitting fluid, confirm normal operation of the high- and low-range measurement sections and changeover mechanism, and complete power, communications, limit and interlock checks. Straight runs and any flow conditioner are established from both geometries, adjacent fittings, complete-system calibration conditions and the approved installation drawing. Vent or drain the impulse system and check zero for each range before commissioning.
INSTALLATION GUIDE · HIGH source confidence
Symptom: Range changeover is abnormal, the reading jumps, the actuator sticks, or communications fail. Possible causes: Incorrect actuator torque or limits, fouling in the mechanism, loss of control-module power, a communications wiring fault, or a blocked or leaking impulse system. Action: Check power, alarms, limits and the communications link first, then inspect the actuator and impulse system. Manually verify movement under the maintenance procedure; after restoration, verify both range zeros and the changeover logic.
TROUBLESHOOTING · HIGH source confidence
Request a detailed datasheet with dimensional drawings, material certificates and ordering information for Adaptive Wide-Range DP Flowmeter.
Production and documentation schedules are confirmed in the quotation after technical review and drawing approval.
Send your process data for an engineering review and a project-specific next step.