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

赫斯曼接头 → Hirsemann connector

磁极 → Magnetic pole

对角线顺序 → Cross-diagonal sequence

脉冲信号 → Pulse signal