Brooks Instruments 1305D10A3B1A Rotameter Flow Meter R-10M-75-3 0-15 GPM 150 PSI

Brooks Instruments 1305D10A3B1A Rotameter Flow Meter R-10M-75-3 0-15 GPM 150 PSI

The Brooks Instruments 1305D10A3B1A is a variable area rotameter designed to measure liquid flow rates up to 15 GPM at a specific gravity of 1.0. It features a clear acrylic tube mounted in a rugged aluminum frame with a direct-reading graduated scale, allowing visual monitoring of flow without the need for external instrumentation. The unit was manufactured by Brooks Instrument Division of Emerson Electric Co. in Hatfield, Pennsylvania.

Specifications & What's Included

• Model: 1305D10A3B1A
• Tube Size: R-10M-75-3
• Scale: S-925-L-056-AAA
• Flow Range: 0–15 GPM
• Fluid Specific Gravity: 1.0 (calibrated for water)
• Maximum Pressure: 150 PSI
• Maximum Temperature: 200°F
• Tube Material: Clear acrylic
• Frame / Body: Aluminum
• End Connections: Threaded NPT fittings (red protective caps installed on both ends)
• Float: Visible through acrylic tube; moves freely
• Manufacturer: Brooks Instrument Division, Emerson Electric Co., Hatfield, PA, USA
• Date Code: 12-79 (December 1979)
• Includes: Flow meter with protective end caps

Applications

Variable area rotameters like the Brooks Instruments 1305D series are a long-established standard for direct-reading liquid flow measurement in laboratory, process, and industrial settings. They work on the simple principle of a float rising and falling within a tapered tube in proportion to flow rate, with no power required — making them reliable and easy to use in a wide range of environments. The R-10M tube series has been widely used in water treatment, chemical processing, cooling systems, semiconductor fabrication, and general laboratory plumbing where a visible, in-line flow indication is needed. Brooks Instruments (later part of Emerson Electric and now operating independently) has produced these Sho-Rate style rotameters since the mid-twentieth century, and spare tubes and floats for many of these models remain available, making used units practical for maintenance replacements or lab upgrades. This particular unit dates from 1979 and is calibrated for water (SP. GR. 1.0) at up to 15 GPM — a common range for mid-scale process and cooling water circuits.