King 7510/7511 Acrylic Tube Rotameter

Fits in-line liquid or gas flow indication where an acrylic-tube variable-area meter with FNPT vertical connections, 316L internals, and direct-reading scales from 50 mm to 250 mm is required.

Key advantages

Acrylic tube VA meter — Machined cast acrylic metering tube with direct-reading scales and white screen-printed scale backs.
Capacity envelope — Water about 7 GPH to 20 GPM; air about 2.6 SCFH to 60 SCFM depending on tube/float.
316L internals — Stainless internals; fittings PVC standard with optional 316L SS or brass.
Scale / accuracy — Scale lengths 50–250 mm; accuracy about ±2% to ±6% FS (250 mm best); 10:1 turndown typical.

Typical applications

In-line water or air flow indication on skids and utility loops.
OEM equipment panels needing FNPT vertical inlet/outlet rotameters.
Duties where elastomer choice (EPR / Buna N / Viton) must match fluid chemistry.

Selection guide

Type — King Instrument 7510/7511 series acrylic tube variable-area flowmeter (rotameter).
Tube — Machined cast acrylic metering tube with direct-reading scales and white screen-printed scale backs.
Internals / fittings — 316L stainless steel internal components; fittings standard PVC with optional 316L SS or brass.
Connections — In-line FNPT vertical inlet/outlet for easy installation.
Capacity — Water about 7 GPH to 20 GPM; air about 2.6 SCFH to 60 SCFM depending on tube/float.
Scales — Direct-reading scale lengths 50 mm, 65 mm, 100 mm, 127 mm and 250 mm.
Accuracy — About ±2% to ±6% of full scale depending on scale length (250 mm best / 50 mm widest).
Turndown / repeatability — 10:1 turndown unless otherwise noted; repeatability about 1–3% depending on scale.
Elastomers — Standard EPR O-rings; optional Buna N or Viton.
Notes — Specs from King Catalog 7510-7511 SERIES. Lock fluid, capacity, scale length, and fitting material on the RFQ.

Common mistakes

Ordering by series only without tube/float capacity — water 7 GPH…20 GPM and air 2.6 SCFH…60 SCFM are envelopes, not one SKU.
Expecting ±2% FS on a 50 mm scale — accuracy widens to about ±6% FS on the shortest scale.
Ignoring elastomer chemistry (EPR std; Buna N / Viton options) vs process fluid.
Specifying horizontal mount — connections are listed as in-line FNPT vertical inlet/outlet.

When to RFQ / what to tell us

Fluid (water/air/other), capacity with units, and operating pressure/temperature.
Scale length (50/65/100/127/250 mm) and accuracy need.
Fitting material (PVC / 316L SS / brass), O-ring (EPR / Buna N / Viton), quantity, ship-to.

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Specs

Spec	Value
SKU	10152
Brand	King Instrument
Model	7510/7511
Product type	acrylictuberotameter
Tube	Machined cast acrylic; direct-reading scales; white screen-printed scale backs
Internals / fittings	316L SS internals; fittings PVC std, optional 316L SS or brass
Connections	In-line FNPT vertical inlet/outlet
Capacity	Water ~7 GPH–20 GPM; air ~2.6 SCFH–60 SCFM (tube/float dependent)
Scale lengths	50 / 65 / 100 / 127 / 250 mm
Accuracy	About ±2% to ±6% of full scale (scale-length dependent)
Turndown	10:1 unless otherwise noted; repeatability about 1–3%
Elastomers	EPR standard; optional Buna N or Viton
Notes	Specs from King Catalog 7510-7511 SERIES (kinginstrumentco.com).

Documents

King Instrument 7510/7511 datasheet (PDF)

FAQ

Q: 7510 vs 7511? A: Both are the King acrylic-tube series in this SKU envelope. State fluid, capacity, scale length, and fitting material so we can lock the catalog configuration.

Q: What accuracy should I expect? A: About ±2% to ±6% of full scale depending on scale length — 250 mm is best; 50 mm is widest.

Q: What should I send for a quote? A: Fluid, capacity, scale length, fittings/elastomers, quantity. Compatible with systems using King 7510/7511 — we do not claim authorized-dealer status.