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Brand: Blue-White
Blue-White F-440 Polysulfone Variable Area Flow Meter
Description
F-440 is a polysulfone-body variable area flow meter (rotameter) from Blue-White for water and compatible liquids from 0.025 to 10 gallons per minute (0.1 to 37.5 litres per minute). Polysulfone gives it a 175 psi pressure rating and a fluid temperature up to 212 F (100 C), well above the acrylic meters of the same family, for indoor in-line or panel installations.
A hot-water capable rotameter in a polysulfone body
In a variable area meter the fluid lifts a float inside a tapered tube, and the flow is read against a printed scale at the float. The F-440 has a dual GPM/LPM scale, a 316 stainless-steel guide rod and a float in PVDF (lowest range) or 316 stainless steel (other ranges). Full-scale accuracy is plus or minus 4 percent, calibrated on water with a specific gravity of 1.0.
The meter is made in five ranges and three layouts: in-line, elbow panel mount (suffix E) and adjustable panel mount (suffix A). Unionised threaded adapters from 1/4 to 3/4 in male NPT make removal for cleaning simple. The datasheet states the meter is for indoor use only and must not be exposed to direct sunlight.
Key features as printed in the datasheet
- Five ranges from 0.025-0.250 GPM to 1.0-10 GPM (0.1-37.5 LPM).
- Polysulfone body, 175 psi (10.3 bar) at 70 F, 212 F (100 C) at 0 psi.
- Full-scale accuracy plus or minus 4 percent.
- 316 stainless-steel float and guide wire (PVDF float on the 250 range).
- In-line, elbow panel-mount or adjustable panel-mount versions.
- Dual GPM/LPM screen-printed scale, about 2 in (50 mm) long.
- Adapters 1/4 to 3/4 in male NPT with polysulfone unions; FKM O-rings (EP optional).
Technical specification
General specification
| Parameter | Specification |
|---|---|
| Maximum working pressure | 175 psi (10.3 bar) at 70 F (21 C) |
| Maximum fluid temperature | 212 F (100 C) at 0 psi |
| Full-scale accuracy | +/- 4 percent |
| Calibration fluid | Water, specific gravity 1.0 |
| Scale length | 2 in (50 mm), approximate |
| Environment | Not for direct sunlight; indoor use |
| Shipping weight | 0.5 lb (0.23 kg) |
| Warranty | 1 year |
Ranges (datasheet)
| Parameter | Specification |
|---|---|
| F-44250L | 0.025-0.250 GPM; 0.1-1.0 LPM; PVDF float |
| F-44375L | 0.1-1.0 GPM; 0.4-4.0 LPM; 316 SS float |
| F-44376L | 0.2-2.0 GPM; 0.75-7.5 LPM; 316 SS float |
| F-44500L | 0.5-5.0 GPM; 1.8-18.0 LPM; 316 SS float |
| F-44750L | 1.0-10.0 GPM; 5.0-37.5 LPM; 316 SS float |
Dimensions by layout
| Parameter | Specification |
|---|---|
| In-line, 1/4 to 3/8 in | A 6-3/16 in (157 mm); B 1-11/16 in (43 mm) |
| In-line, 1/2 to 3/4 in | A 7-1/2 in (191 mm); B 2 in (51 mm) |
| Elbow, 1/4 to 3/8 in | A 7 in (178 mm); B 3 in (76 mm); C 1-11/16 in; D 5-15/16 in (151 mm) |
| Elbow, 1/2 to 3/4 in | A 8-1/8 in (206 mm); B 3 in (76 mm); C 2 in (51 mm); D 6-13/16 in (173 mm) |
| Adjustable panel, 1/4 to 3/8 in | A 7 in (178 mm); B 4-1/2 in (114 mm); C 1-11/16 in; D 6 in (152 mm) |
| Adjustable panel, 1/2 to 3/4 in | A 8 in (203 mm); B 4-1/2 in (114 mm); C 2 in; D 6-13/16 in (173 mm) |
Materials
| Parameter | Specification |
|---|---|
| Meter body | Polysulfone |
| Adapters | Polysulfone male NPT |
| Union nuts | Nylon |
| Guide rod holder | Polysulfone |
| Guide rod | 316 stainless steel |
| Float | 316 stainless steel or PVDF (by range) |
| O-ring seals | FKM (EP optional) |
Selection and ordering guide
The part number is F-44 [scale] L [installation] – [adapter] [O-ring], for example F-44250L-6. Scale code 250, 375, 376, 500 or 750 selects the range. Letter L is the 316 stainless-steel guide rod. Leave the installation blank for in-line, E for elbow panel mount and A for the adjustable panel model (for the 750). The adapter digits are 6 (3/8 in male NPT), 8 (1/2 in male NPT) and 12 (3/4 in male NPT) with polysulfone adapter and union; add -E for EP O-rings.
Choose the range so that normal flow sits in the middle of the scale. In-house NIST calibration, OEM packaging and silicone-oil-free options are mentioned on the datasheet as available.
Installation and operation notes
The manual requires upward flow and vertical installation only, in a clean, uniform and well-supported pipe that stays perfectly vertical. Fit unionised fittings before and after the meter so it can be removed for service, and review system flow and pressure against the meter ratings before installation.
The meter is calibrated for clean water only; the manual warns that, although other chemicals may be suitable, Blue-White cannot guarantee readings for them. Do not install it in direct sunlight.
Applications in Oman and the GCC
Typical uses are cooling-water and process-water flow checks, chemical-feed rate verification at dosing skids, flush-water indicators on RO systems, and laboratory or pilot rigs. The 100 C fluid rating makes the F-440 suitable for warm return lines where acrylic meters would be limited, provided pressure is derated as the temperature-versus-pressure graph in the manual shows.
In hot climates the housing must stay out of the sun and the 175 psi rating applies at 70 F, so check the derating graph for hot fluid.
Compatible accessories and related items
The same family includes the F-450 to F-462 polysulfone meters, and the acrylic F-400 to F-430 and F-550 series; for dosing, see the FLEXFLO and CHEM-FEED pumps and the MS6 ultrasonic chemical-feed flow meter listed on this site. Blue-White also lists accessory pages for tubing, foot valves and injection fittings.
Related Blue-White products: Blue-White MS6 SONIC-PRO Ultrasonic Chemical Feed Flow Meter and Blue-White F-550 Acrylic Variable Area Flow Meter 75 LPM.
Documents and quotation
Need F-440? The Blue-White technical data sheet is attached to this listing. Seven Star LLC (independent supplier, Muscat) can quote the item and arrange supply on request; list quantity and site location in your enquiry. Verify the code, dimensions and approvals in the document before ordering. Other products are in the category page.
Datasheets & Documents
- Datasheet Blue-White F-440 technical data sheet 85000-090 (PDF) Download
Reviews (0)
About brand
Blue-White Industries is an American maker of metering pumps, flowmeters and water treatment accessories, based in Huntington Beach, California. It was founded in 1957 by Ozzie King, a pool builder and inventor who switched King Blue-White Pools from building pools to manufacturing; his F-300 series flowmeters became a pool industry standard. Today Blue-White makes peristaltic and diaphragm metering pumps for municipal and industrial water treatment.
Seven Star LLC is an independent supplier in Muscat. We list Blue-White pumps and flow meters, with the official technical data sheet attached to each product page, for water treatment and process projects in Oman and the GCC.
Blue-White company profile
| Founded | 1957, California, by Ozzie King |
|---|---|
| Headquarters | Huntington Beach, California |
| Early product | F-300 series flowmeters |
| Markets | Municipal and industrial water treatment, irrigation, semiconductor, food and beverage |
| Product families | FLEXFLO A1, A5 and M3 peristaltic metering pumps, CHEM-FEED C2, C3 and CD3 diaphragm metering pumps, variable area and ultrasonic flowmeters, paddlewheel flow sensors |
Milestones
- 1957: Ozzie King incorporates Blue-White Industries.
- 2017: Blue-White marks 60 years.
Blue-White product series
FLEXFLO peristaltic metering pumps include the A1, the M3 for 126 l/h and the A5 for up to 2021 l/h; they pump chemicals that gas off, such as sodium hypochlorite, without vapour locking. CHEM-FEED diaphragm pumps include the C2, the high-output C3, the multi-diaphragm CD3 and the mechanical C-600P.
Flow measurement includes the F-440 polysulfone and F-550 acrylic variable area flow meters and the MS6 SONIC-PRO ultrasonic flow meter for chemical feed lines.
Where Blue-White equipment is used
Disinfection and pH control in drinking water and wastewater plants, chemical dosing in desalination and cooling water, pools, carwashes and process industries.
Blue-White products we list
Ordering Blue-White products: what we need
Send the model, flow range, discharge pressure, chemical and concentration, tube or diaphragm material, supply voltage and the control input required (manual, 4-20 mA, pulse or network).
Facts checked against Blue-White's 60th anniversary release and company profiles, October 2026.
Browse Blue-White products by category: Pumps.
FAQ
Questions about the Blue-White F-440 Polysulfone Variable Area Flow
Answers from our engineering team on installation, compatibility and integration.
01What flow ranges does the Blue-White F-440 cover?
Five ranges from 0.025-0.250 GPM up to 1.0-10 GPM, or 0.1 to 37.5 LPM.
02What is the accuracy of the F-440?
Full-scale accuracy is plus or minus 4 percent, calibrated on water of specific gravity 1.0.
03Can the F-440 be used outdoors?
No. The datasheet says indoor use only, not for direct sunlight exposure.
04How must the F-440 be installed?
Vertically, with upward flow only, in a clean, well-supported pipe, preferably with unions either side.
05Does Seven Star LLC act as a Blue-White distributor?
No, we are an independent supplier in Muscat and supply Blue-White items on request rather than acting as a Blue-White channel partner.
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