King 7520 / 7530 Acrylic Rotameter

Fits panel liquid or air indication where you need a King 7520/7530 acrylic-block rotameter with optional inlet valve.

Key advantages

• Acrylic block — Panel-mount acrylic-block rotameter (7520 no valve / 7530 with optional inlet valve)
• Capacities — water 7 GPH to 20 GPM; air 2.6 SCFH to 60 SCFM
• Scale lengths — 50 / 75 / 100 / 127 / 250 mm direct-reading scales
• Accuracy — ±2% FS (250 mm) to ±6% FS (50 mm); scale-length dependent
• Fittings / seals — Horizontal NPT; PVC/brass/316L SS fitting options; EPR/Buna/Viton/Kalrez O-rings

Typical applications

• Panel-mount water or air flow indication in utilities and OEM skids.
• 7530 builds that need an optional inlet valve on the acrylic block.
• Horizontal NPT fitting selections in PVC, brass, or 316L SS.

Selection guide

• 7520 vs 7530 — no valve vs optional inlet valve.
• Capacity — water 7 GPH to 20 GPM; air 2.6 SCFH to 60 SCFM
• Scale length — 50 / 75 / 100 / 127 / 250 mm direct-reading scales (drives accuracy).
• P/T — Liquid 130 °F (54 °C); gas 100 °F (38 °C); Water 150 psig; air 125 psig
• O-rings — EPR/Buna/Viton/Kalrez options.

Common mistakes

• Picking a 50 mm scale when the loop needs ±2% FS (250 mm).
• Using gas P/T limits for liquid service (or the reverse).
• Forgetting the inlet valve is 7530-only optional.

When to RFQ / what to tell us

1. Water or air; target flow; scale length.
2. 7520 vs 7530 (valve); fitting material; O-ring; quantity; ship-to.

Request a Quote · Get selection help

Specs

Documents

• King Instrument 7520 / 7530 Series Rotameter datasheet (PDF)
• King Instrument 7520 / 7530 Series Rotameter manual (PDF)

FAQ

Q: Accuracy vs scale? A: ±2% FS (250 mm) to ±6% FS (50 mm) — scale-length dependent.

Q: Turndown? A: 10:1 typical unless noted.

Q: What should I send for a quote? A: Media, flow, scale, 7520/7530, fittings, quantity.

Links

• Request a Quote
• Get selection help
• Category