Low Flow Single Tube Rotameter

The 1/8" FNPT Model P Flow Meter is engineered for low flow-rate precision, delivering the simplicity, versatility, and cost-effectiveness of a classic rotameter in a rugged, ready-to-install package. Ideal for chromatography carrier gases, manufacturing process control, and dependable liquid or gas measurement in laboratories, pilot plants, and flow/level indication applications, each unit ships fully assembled with standard mounting fittings, protective side plates, a thick magnifying front shield, and flow tubes. High-precision control valves are especially valuable for ultra-low flow ranges that require high sensitivity. Model P 65mm and 150mm flow meters include air and water flow data; flow data for routine gases is available on the spec sheet. These meters feature enhanced readability and durable construction, ensuring reliable performance across various industries, including healthcare, food and beverage, biotechnology, and water treatment. The OPTIGRAD™ scale design minimizes parallax & reduces eye fatigue during long monitoring periods. See spec sheet for flow data for routine gases.

Designed specifically for low flow-rate accuracy, sensitivity, & repeatable measurement
Integrated magnifier lens improves readability & enhances resolution
Easy flow tube installation and exchange for fast range changes & streamlined maintenance
Non-rotating adapter feature prevents glass tubes from turning during tightening/assembly
Optional high-precision control valve for extremely fine adjustment at very low flow rates
Chemical compatibility supported through multiple float & sealing material options
Simple panel-mounting method supports clean integration into OEM systems & lab setups
Built with precision-ground floats for consistent, stable, & accurate flow indication
Pressure rating: 200 psi/13.8 Bar
Maximum temperature: 250ºF (121ºC)

Item #	Description	Catalog Pg.	Price
Item 97724	65mm Aluminum Single Tube Rotameter w/ High Precision Valve, Air: 19mL/Mn 213/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	213/Each Drop Ship
Item 97725	65mm Aluminum Single Tube Rotameter w/ High Precision Valve, Air: 49mL/Mn; Water: 0.5mL/Mn 213/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	213/Each Drop Ship
Item 97726	65mm Aluminum Single Tube Rotameter w/ High Precision Valve, Air: 145mL/Mn; Water: 2.3mL/Mn 213/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	213/Each Drop Ship
Item 97727	65mm Aluminum Single Tube Rotameter w/ Standard Valve, Air: 216mL/Mn; Water: 3mL/Mn 140/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	140/Each Drop Ship
Item 97728	65mm Aluminum Single Tube Rotameter w/ Standard Valve, Air: 538mL/Mn; Water: 11.7mL/Mn 140/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	140/Each Drop Ship
Item 97729	65mm Aluminum Single Tube Rotameter w/ Standard Valve, Air: 1036mL/Mn; Water: 20mL/Mn 140/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	140/Each Drop Ship
Item 97730	65mm Aluminum Single Tube Rotameter w/ Standard Valve, Air: 2520mL/Mn; Water: 70.5mL/Mn 140/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	140/Each Drop Ship
Item 97731	65mm Aluminum Single Tube Rotameter w/ Standard Valve, Air: 4917mL/Mn; Water: 143mL/Mn 140/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	140/Each Drop Ship
Item 97732	65mm Aluminum Single Tube Rotameter w/ Standard Valve, Air: 12058mL/Mn; Water: 364mL/Mn 140/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	140/Each Drop Ship
Item 97733	65mm Aluminum Single Tube Rotameter w/ Standard Valve, Air: 24452mL/Mn; Water: 723mL/Mn 140/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	140/Each Drop Ship
Item 97734	150mm Aluminum Single Tube Rotameter w/ High Precision Valve, Air: 34mL/Mn 276/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	276/Each Drop Ship
Item 97735	150mm Aluminum Single Tube Rotameter w/ High Precision Valve, Air: 138mL/Mn; Water: 2.25mL/Mn 276/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	276/Each Drop Ship
Item 97736	150mm Aluminum Single Tube Rotameter w/ Standard Valve, Air: 262mL/Mn; Water: 4.9mL/Mn 205/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	205/Each Drop Ship
Item 97737	150mm Aluminum Single Tube Rotameter w/ Standard Valve, Air: 816mL/Mn; Water: 19.2mL/Mn 205/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	205/Each Drop Ship
Item 97738	150mm Aluminum Single Tube Rotameter w/ Standard Valve, Air: 1665mL/Mn; Water: 44.3mL/Mn 205/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	205/Each Drop Ship
Item 97739	150mm Aluminum Single Tube Rotameter w/ Standard Valve, Air: 4494mL/Mn; Water: 132.5mL/Mn 205/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	205/Each Drop Ship
Item 97740	150mm Aluminum Single Tube Rotameter w/ Standard Valve, Air: 7720mL/Mn; Water: 234mL/Mn 205/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	205/Each Drop Ship
Item 97741	150mm Aluminum Single Tube Rotameter w/ Standard Valve, Air: 16493mL/Mn; Water: 498mL/Mn 205/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	205/Each Drop Ship
Item 97742	150mm Aluminum Single Tube Rotameter w/ Standard Valve, Air: 23105mL/Mn; Water: 579mL/Mn 215/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	215/Each Drop Ship
Item 97743	150mm Aluminum Single Tube Rotameter w/ Standard Valve, Air: 60212mL/Mn; Water: 1972mL/Mn 215/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	215/Each Drop Ship
Item 97744	65mm Stainless Steel Single Tube Rotameter w/ High Precision Valve, Air: 19mL/Mn 408.16/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	408.16/Each Drop Ship
Item 97745	65mm Stainless Steel Single Tube Rotameter w/ High Precision Valve, Air: 49mL/Mn; Water: 0.5mL/Mn 408.16/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	408.16/Each Drop Ship
Item 97746	65mm Stainless Steel Single Tube Rotameter w/ High Precision Valve, Air: 145mL/Mn; Water: 2.3mL/Mn 408.16/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	408.16/Each Drop Ship
Item 97747	65mm Stainless Steel Single Tube Rotameter w/ Standard Valve, Air: 216mL/Mn; Water: 3mL/Mn 278/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	278/Each Drop Ship
Item 97748	65mm Stainless Steel Single Tube Rotameter w/ Standard Valve, Air: 538mL/Mn; Water: 11.7mL/Mn 278/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	278/Each Drop Ship
Item 97749	65mm Stainless Steel Single Tube Rotameter w/ Standard Valve, Air: 1036mL/Mn; Water: 20mL/Mn 278/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	278/Each Drop Ship
Item 97750	65mm Stainless Steel Single Tube Rotameter w/ Standard Valve, Air: 2520mL/Mn; Water: 70.5mL/Mn 278/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	278/Each Drop Ship
Item 97751	65mm Stainless Steel Single Tube Rotameter w/ Standard Valve, Air: 4917mL/Mn; Water: 143mL/Mn 278/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	278/Each Drop Ship
Item 97752	65mm Stainless Steel Single Tube Rotameter w/ Standard Valve, Air: 12058mL/Mn; Water: 364mL/Mn 278/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	278/Each Drop Ship
Item 97753	65mm Stainless Steel Single Tube Rotameter w/ Standard Valve, Air: 24452mL/Mn; Water: 723mL/Mn 278/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	278/Each Drop Ship
Item 97754	150mm Stainless Steel Single Tube Rotameter w/ High Precision Valve, Air: 34mL/Mn 473.16/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	473.16/Each Drop Ship
Item 97755	150mm Stainless Steel Single Tube Rotameter w/ High Precision Valve, Air: 138mL/Mn; Water: 2.25mL/Mn 473.16/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	473.16/Each Drop Ship
Item 97756	150mm Stainless Steel Single Tube Rotameter w/ Standard Valve, Air: 262mL/Mn; Water: 4.9mL/Mn 349/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	349/Each Drop Ship
Item 97757	150mm Stainless Steel Single Tube Rotameter w/ Standard Valve, Air: 816mL/Mn; Water: 19.2mL/Mn 349/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	349/Each Drop Ship
Item 97758	150mm Stainless Steel Single Tube Rotameter w/ Standard Valve, Air: 1665mL/Mn; Water: 44.3mL/Mn 349/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	349/Each Drop Ship
Item 97759	150mm Stainless Steel Single Tube Rotameter w/ Standard Valve, Air: 4494mL/Mn; Water: 132.5mL/Mn 349/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	349/Each Drop Ship
Item 97760	150mm Stainless Steel Single Tube Rotameter w/ Standard Valve, Air: 7720mL/Mn; Water: 234mL/Mn 349/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	349/Each Drop Ship
Item 97761	150mm Stainless Steel Single Tube Rotameter w/ Standard Valve, Air: 16493mL/Mn; Water: 498mL/Mn 349/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	349/Each Drop Ship
Item 97762	150mm Stainless Steel Single Tube Rotameter w/ Standard Valve, Air: 23105mL/Mn; Water: 579mL/Mn 359/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	359/Each Drop Ship
Item 97763	150mm Stainless Steel Single Tube Rotameter w/ Standard Valve, Air: 60212mL/Mn; Water: 1972mL/Mn 359/Each Drop Ship Save 5% when you buy 2+ Save 10% when you buy 4+ Save 15% when you buy 12+	NEW	359/Each Drop Ship

Note: Product testing for individual applications is recommended before use. U.S. Plastic Corp. cannot be held liable for individual application failures.

Low Flow Single Tube Rotameter

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