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King Instrument
King 7430 / 7440 Glass Tube Rotameter
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Low-flow borosilicate glass rotameter. 65/150 mm scales. RFQ + engineer selection help.
Download datasheet PDF
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Key parameters
Accuracy
±6% of full scale flow (65 mm); see catalog for 150 mm
Type
Low-flow borosilicate glass tube rotameter (7430 / 7440 Series)
Scale
65 mm or 150 mm detachable direct-reading scales
Connections
7430 horizontal / panel; 7440 vertical 1/4 in FNPT
Max Pressure
316L SS / Hastelloy fittings 200 psig; PVC 130 psig; PVDF 150 psig
Max Temperature
Gases 250 °F (121 °C); liquids 200 °F (93 °C) with SS/Hastelloy fittings
Fits low-flow liquid or gas service where you need a King 7430/7440 borosilicate glass-tube rotameter with 65 or 150 mm scales.
Key advantages
- Low-flow glass tube — Low-flow borosilicate glass tube rotameter (7430 / 7440 Series)
- Scales — 65 mm or 150 mm detachable direct-reading scales
- Flow (water/air) — Approx. 0.56–1,800 cc/min water (model dependent); Approx. 54–70,000 cc/min air (model dependent)
- Connections — 7430 horizontal / panel; 7440 vertical 1/4 in FNPT
- P/T by fitting — 316L SS / Hastelloy fittings 200 psig; PVC 130 psig; PVDF 150 psig; Gases 250 °F (121 °C); liquids 200 °F (93 °C) with SS/Hastelloy fittings
Typical applications
- Low-flow liquid dosing or purge indication (cc/min class).
- Low-flow air/gas indication depending on tube.
- Panel (7430) or vertical 1/4 in FNPT (7440) installs.
Selection guide
- Series — 7430 horizontal/panel vs 7440 vertical 1/4 in FNPT.
- Scale length — 65 mm or 150 mm detachable direct-reading scales (accuracy differs).
- Flow — water Approx. 0.56–1,800 cc/min water (model dependent); air Approx. 54–70,000 cc/min air (model dependent)
- Fitting material — 316L SS / Hastelloy / PVC / PVDF pressure limits differ.
- Accuracy — ±6% of full scale flow (65 mm); see catalog for 150 mm
Common mistakes
- Ordering 7430 panel style when the pipe run needs 7440 vertical FNPT.
- Expecting ±2% FS — 65 mm publishes ±6% FS.
- Exceeding PVC/PVDF pressure ratings with SS-fitting assumptions.
When to RFQ / what to tell us
- Liquid or gas; target flow; 65 vs 150 mm scale.
- 7430 vs 7440; fitting material; quantity; ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 10151 |
| Brand | King Instrument |
| Model | 7430 / 7440 Series |
| Product type | Glass Tube Rotameter |
| Type | Low-flow borosilicate glass tube rotameter (7430 / 7440 Series) |
| Scale | 65 mm or 150 mm detachable direct-reading scales |
| Accuracy | ±6% of full scale flow (65 mm); see catalog for 150 mm |
| Connections | 7430 horizontal / panel; 7440 vertical 1/4 in FNPT |
| Max pressure | 316L SS / Hastelloy fittings 200 psig; PVC 130 psig; PVDF 150 psig |
| Max temperature | Gases 250 °F (121 °C); liquids 200 °F (93 °C) with SS/Hastelloy fittings |
| Flow (water) | Approx. 0.56–1,800 cc/min water (model dependent) |
| Flow (air) | Approx. 54–70,000 cc/min air (model dependent) |
Documents
- King Instrument 7430 / 7440 Series datasheet (PDF)
- King Instrument 7430 / 7440 Series datasheet (PDF)
FAQ
Q: 7430 vs 7440? A: 7430 is horizontal/panel; 7440 is vertical 1/4 in FNPT.
Q: Accuracy? A: ±6% FS on 65 mm; see King catalog for 150 mm.
Q: What should I send for a quote? A: Media, flow, scale, series, fittings, quantity.
Links
| Parameter | Value |
|---|---|
| Accuracy | ±6% of full scale flow (65 mm); see catalog for 150 mm |
| Type | Low-flow borosilicate glass tube rotameter (7430 / 7440 Series) |
| Scale | 65 mm or 150 mm detachable direct-reading scales |
| Connections | 7430 horizontal / panel; 7440 vertical 1/4 in FNPT |
| Max Pressure | 316L SS / Hastelloy fittings 200 psig; PVC 130 psig; PVDF 150 psig |
| Max Temperature | Gases 250 °F (121 °C); liquids 200 °F (93 °C) with SS/Hastelloy fittings |
| Flow Water | Approx. 0.56–1,800 cc/min water (model dependent) |
| Flow Air | Approx. 54–70,000 cc/min air (model dependent) |
| Document | King Catalog 7430 SERIES + 7440 SERIES |