Product Overview?

The ?TC-TY series oval gear flow meter? is a positive displacement meter specifically engineered for high-viscosity fluids, including:

Heavy oils

Polyvinyl alcohol (PVA)

Resins

As a purely mechanical device, it is intrinsically safe for hazardous environments and offers:

Local display

Pulse signal output for remote transmission

Optional stainless steel construction for corrosive/sterile environments (e.g., chemical, food-grade applications)

Technical Specifications?

1. ?Core Parameters?

Accuracy Class?: ±0.3% or ±0.5%

Bore Sizes?: DN10–DN150

Materials?:

Housing?: Aluminum / Stainless steel (high-pressure variants) / PPS / Bronze

Bearings?: Ceramic / Bronze / Hastelloy / Carbide / PPS / Stainless steel

Shaft?: 316 stainless steel

Seals?: Viton? / FKM / PTFE / Stainless steel O-rings

2. ?Performance Metrics?

Turndown Ratio?: 10:1 (up to 50:1 optimized)

Repeatability?: ±0.03%

Viscosity Range?: 1–1,000,000 cP

Pressure Rating?: Up to 551 bar

Temperature Range?: -10°C to +60°C

3. ?Installation Requirements?

Pipe Straight Runs?: 5D upstream + 3D downstream (mandatory 80μm upstream filter)

Flow Direction?: Unidirectional (reverse flow prohibited)

Priming Protocol?: Gradual startup (<50% overrange) to prevent gear damage

Operating Principle?

Fluid Displacement?:

Fluid enters the metering chamber, driving paired oval gears via differential pressure. Each rotation displaces a fixed volume.

Signal Generation?:

TTL (NPN transistor) or contact-closure pulse output

Accuracy improves with viscosity (±0.1% achievable at high viscosity)

Critical Notes?

Prohibited Media?:

Solids-laden fluids (risk of gear jamming)

Aerated liquids (measurement errors)

Water (prohibited for testing)

Maintenance?:

Avoid disassembling rear cover (calibration integrity)

Use bypass valves for system flushing

Error Calculation & Calibration?

Basic Error Formula (Volumetric Method)?:

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E = (Vm - V) / V × 100%  

E?: Meter error (cumulative)

Vm?: Meter reading

V?: Calibrated reference value

Adjustment Method?:

Replace counter gear pairs to modify mechanical transmission ratio (does not alter flow characteristics).