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Brand: Brooks Instrument
Brooks Instrument Sho-Rate 1350G and 1355G Rotameter
Description
Configurable low-flow rotameters with purge-service heritage
The Sho-Rate 1350G and 1355G are glass tube variable area flowmeters (rotameters) for low flows of gas and liquid. Brooks says the Sho-Rate family has been the industry standard for decades and is particularly suited to purge applications. The base configuration is a borosilicate glass tube in an aluminium frame with 316 stainless steel end blocks, adaptors and valve, and further material, valve and flow-controller options let the meter be matched to the process.
The 1350G is the 5 percent accuracy model and the 1355G the 3 percent model, both at reference conditions of air or water at 14.7 psia and 70 F. The heavy-wall precision-bore tube resists thermal shock and corrosive gases, a clear polycarbonate face shield with built-in magnifier helps reading, and interchangeable tubes and floats with integral float stops allow in-situ maintenance without losing the float.
Technical specifications
| Parameter | Specification |
|---|---|
| Models | 1350G and 1355G |
| Accuracy | +/-5% (1350G) or +/-3% (1355G) at reference conditions |
| Repeatability | 0.25% of full scale |
| Reference conditions | Air or water at 14.7 psia and 70 F (1.01 bar, 21.1 C) |
| Pressure and temperature | 200 psig (13.8 bar) at 33 to 250 F (1 to 121 C) |
| Materials | Borosilicate glass, brass, aluminium, 316 stainless steel, clear and milk-white polycarbonate, Teflon |
| End blocks | Stainless steel or brass |
| Float materials | Glass, sapphire, stainless steel, Carboloy, tantalum |
| Elastomer seals | Viton, Teflon, Buna, Kalrez, EPR (per tube-packing and O-ring code) |
| Connections | 1/8 and 1/4 inch NPT; 1/8 and 1/4 inch compression; 6 mm compression; 1/4 and 3/8 inch Rc; 1/4 inch VCR; 1/4 inch ID hose; with or without locknuts |
| Water range, 1350G | 0.010 GPH (0.041 l/h) up to about 30 GPH (110 l/h) depending on tube and float |
| Air range, 1350G | 0.12 SCFH (3.2 NLPH) up to about 120 SCFH (3300 NLPH) |
| Water and air range, 1355G | 0.59 cc/min and 50 SCC/M up to 2000 cc/min and 63 SLPM |
| Alarms | One or two inductive ring sensors or switches, with intrinsically safe relay options |
| Valves | Cartridge III valve and NRS valve in stainless steel; integral flow controller upstream or downstream |
| Certifications | International calibration certificate, CRN, PED (97/23/EC), RoHS II, REACH, material certificate 2.1 |
Picking tube, float and fittings
Capacity tables list each tube number against the float material. For the 1350G, rib-guide tubes with spherical floats in sizes 2 and 6 cover the lower flows, for example tube R-2-65-A with a glass float for 0.010 GPH of water, up to R-6-65-B with a tantalum float for about 30 GPH. The 1355G uses tubes such as R-2-15-AAAA for the lowest flows and R-6-15-B for the highest. Standard scales are direct reading on the tube, plus millimetre scales supported by flow data for all fluids and conditions.
The model code includes tube packing and O-ring material pairs (for example Viton with Viton, or Teflon with Buna), the end-fitting material and connection, and a valve type from a plain valve plug through numbered NRS stainless steel valves.
What to confirm before ordering
Send the fluid, flow range and unit, pressure and temperature, connection and thread type, valve and controller preference, alarm needs and any certificate you require such as ICC or CRN. The datasheet title and the product name differ slightly, so for a replacement please give the complete code from the existing nameplate. Glass tube meters are not suited to fluids that attack borosilicate glass, and the rated pressure and temperature must not be exceeded.
Documents and quotation
The manufacturer datasheet (11 pages) is attached to this page as a download. For a quotation, send the full model code and the process data to Seven Star LLC in Muscat; browse more instruments in the Flowmeters category. We supply this item as an independent supplier, so please confirm availability and delivery with us.
Datasheets & Documents
- Datasheet Brooks Instrument Sho-Rate 1350G and 1355G datasheet (file Data-Sheet-1350G-EN) Download
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About brand
Brooks Instrument makes mass flow controllers, flowmeters and pressure and vacuum instruments for gases and liquids. The industrial chemist Stephen A. Brooks started the business in 1946 as the Brooks Rotameter Company near Philadelphia, building variable area flowmeters. After many years as part of Emerson, Brooks was sold to American Industrial Partners at the end of 2007 and has been a division of Illinois Tool Works (ITW) since January 2012. It is headquartered in Hatfield, Pennsylvania.
Seven Star LLC is an independent supplier listing Brooks Instrument thermal and Coriolis mass flow controllers and variable area flowmeters for buyers in Oman and the GCC. Instruments are matched from the model code and the gas, range and calibration data on the label.
Brooks Instrument company profile
| Origin | Founded in 1946 by Stephen A. Brooks as the Brooks Rotameter Company, Lansdale, Pennsylvania |
|---|---|
| Headquarters | Hatfield, Pennsylvania, USA |
| Ownership | Emerson division until 31 December 2007, then American Industrial Partners; part of ITW since January 2012 |
| Product families | Thermal, pressure-based and Coriolis mass flow controllers and meters, metal tube and glass tube variable area flowmeters, pressure and vacuum products |
| Typical duty | Precise gas and liquid flow control in process, laboratory, analyser, fuel cell and semiconductor applications |
Milestones
- 1946: Stephen A. Brooks founds the Brooks Rotameter Company in Lansdale, Pennsylvania.
- 2007: After years as an Emerson division, Brooks is sold to American Industrial Partners on 31 December.
- 2012: Brooks Instrument becomes part of ITW in January.
Brooks mass flow controllers and flowmeters
| Series | Type | Typical use |
|---|---|---|
| SLA5800, SLAMf | Thermal mass flow controllers and meters | Gas flow control in process and analytical systems; SLAMf with an IP66 enclosure for harsh or outdoor locations |
| 5800E | Analog thermal mass flow controller | Installed base in older systems; often replaced with the SLA5800 series |
| Quantim QMC | Coriolis mass flow controller | Low-flow liquid and gas control independent of fluid properties |
| GF40, GF80, GF100, GP200 | Metal-sealed thermal and pressure-based mass flow controllers | High-purity and semiconductor gas delivery; MultiFlo allows gas and range changes without recalibration |
| MT3750C, MT3809G | Metal tube variable area flowmeters | Purge, chemical injection and utility flows at higher pressure and temperature, with optional transmitter and alarms |
| GT1600, Sho-Rate 1250/1255 | Glass tube variable area flowmeters | Visual flow indication on purge, sample and laboratory lines |
Where Brooks instruments are used
Brooks mass flow controllers dose gases in analyser systems, catalyst and pilot plant testing, gas blending, burner and combustion control, fuel cell test stands and semiconductor tools. Variable area flowmeters are widely used on purge gas, seal flush, sample and chemical injection lines in oil and gas, refining and petrochemical plants, where a simple local indication without external power is preferred.
Ordering Brooks instruments: what we need
Send the full model code and serial number from the label. Mass flow controllers are calibrated for a specific gas and full-scale flow, so state the gas or gas mixture, flow range, inlet and outlet pressure, temperature, process connection, seal material, signal (analog, RS-485, DeviceNet, EtherNet/IP or other) and any hazardous-area requirement. For variable area meters add the fluid, density, viscosity, flow range, connection size, materials and whether alarms or a 4-20 mA output are needed.
Facts checked against Brooks Instrument company information and product data, October 2026.
Browse Brooks Instrument products by category: Flowmeters.
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Frequently Asked Questions
What is the difference between the 1350G and 1355G?
The 1350G is rated to 5 percent accuracy and the 1355G to 3 percent, both at reference conditions.
Is it suited to purge service?
Brooks names purge applications as a particular fit for the Sho-Rate family.
Can it include alarms?
Yes, one or two inductive ring sensors, with intrinsically safe relay options.
What pressure can it handle?
200 psig (13.8 bar) at 33 to 250 F.
Is a flow controller option offered?
Yes. An integral flow controller can be fitted upstream or downstream.
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