The installation guide for miniature gear flowmeters

The installation guide for miniature gear flowmeters:

I. Flow Direction & Orientation Control (Critical Steps)?

Verify Flow Direction Marking?

The arrow indicator on the flowmeter housing ?must strictly align? with the actual fluid flow direction in the pipeline. Reverse installation causes gear backlash, measurement failure, or device damage?.

→ ?Operational Validation?: After installation, apply low-pressure air blast at the inlet; normal pulse signal changes on the display confirm correct orientation?.

Installation Orientation Standards?

Horizontal Installation (Preferred)?: Ensure the elliptical gear shaft is parallel to ground level, with the cover plate perpendicular to the horizontal plane?.

Vertical Installation?: Permit ?bottom-to-top flow only? to prevent gear jamming?.

II. Gear Assembly Key Details?

Magnetic Pole Calibration?

Magnetically coupled gears must be installed with the magnetic pole surface facing ?upward?, aligned with the Hirsemann connector?.

→ ?Test Requirement?: Manually rotate gears to confirm smooth meshing without binding?.

Leak Prevention?

Tighten cover plate screws following a ?cross-diagonal sequence? to avoid seal deformation?.

III. Pipeline System Protection?

Mandatory Filtration?

Install a filter upstream of the flowmeter to block fibers and particulates from entering gear clearance?.

Bypass Pipeline Design?

Deploy a bypass circuit for vertical installations or maintenance requirements?.

Valve Positioning?

Regulating valves must be installed ?downstream?; operate valves gradually during startup/shutdown?.

IV. Environmental & Electrical Safety?

Vibration/Interference Mitigation?

Isolate from strong magnetic sources (motors, transformers); reinforce piping if vibrating?.

Electrical Isolation?

Use shielded cables with single-point grounding (resistance <10 ohm)?.

Corrosion Protection?

Select stainless steel flowmeters for corrosive fluids?.

V. Pre-Commissioning Checklist?

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1. Flush pipelines: Remove welding slag/debris (mandatory for new pipelines)?:ml-citation{ref="6" data="citationList"}.  

2. Seal test: Pressure-check all connections for leaks.  

3. No-flow test: Verify display shows zero reading without fluid.  

4. Minimum flow test: Confirm stable pulse signals at low flow rates?:ml-citation{ref="1,2" data="citationList"}.  

?? PROHIBITED OPERATIONS?:

Direct steam flushing of flowmeter?.

Exceeding rated capacity (recommended flow range: 50%–80%)?.

Following these procedures ensures measurement accuracy and extends service life. For gear seizure incidents, disassemble, clean, and recalibrate magnetic pole alignment?.

Key Terminology Consistency:

旁通管道 → Bypass pipeline

赫斯曼接頭 → Hirsemann connector

磁極 → Magnetic pole

對角線順序 → Cross-diagonal sequence

脈沖信號 → Pulse signal