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Brand: Brooks Instrument
Brooks Instrument Sho-Rate 1250 and 1255 Glass Tube Flowmeter
Description
Low-flow glass tube meters made for panels and OEM equipment
The Sho-Rate 1250 and its longer sibling the 1255 are precision low-flow glass tube variable area flowmeters from Brooks Instrument for liquids and gases in laboratory, industrial and OEM equipment. The 1250 has a compact 65 mm scale and the 1255 an extended 150 mm scale. A rotating lens gives a 180 degree magnified view for panel mounting, which the datasheet says reduces reading errors.
Both meters use borosilicate glass tubes with a choice of aluminium or stainless steel end blocks, an optional inlet or outlet valve, and Buna or Viton O-rings. The EZ-CHANGE design allows tube assemblies to be swapped quickly, so a meter can be reconfigured or serviced with little downtime. Standard scales are direct reading or millimetre for air, nitrogen and water at reference conditions, with additional scales for oxygen, carbon dioxide, helium, argon and other gases.
Technical specifications
| Parameter | Specification |
|---|---|
| Models | 1250 (65 mm tube) and 1255 (150 mm tube) |
| Accuracy | +/-5% of full scale (1250); +/-3% of full scale (1255), at reference conditions for listed gases |
| Repeatability | 0.25% of full scale |
| Reference conditions | 70 F (21.1 C) and 14.7 psia |
| Pressure and temperature | 200 psig (13.8 bar) at 33 to 250 F (1 to 121 C) |
| Materials | Borosilicate glass, aluminium, 316 stainless steel, clear polycarbonate, Teflon |
| End blocks | Stainless steel or aluminium |
| Float materials | Glass, sapphire, stainless steel, Carboloy, tantalum |
| Packing | Viton fluoroelastomer or Buna-N |
| Connections | 1/8 inch NPT with locknuts (aluminium or stainless steel); 1/4 inch NPT with locknuts (stainless steel only) |
| Valve options | Cartridge valve in stainless steel or brass; valve material follows end-block material |
| Air ranges, examples | 1250: 2 to 50 CCM (tube D6011) up to 5000 CCM (D6052); 1255: 4 to 160 CCM (D1022) up to 2000 to 66000 CCM (D1085) |
| Water ranges, examples | 1250: 4 to 140 CCM (D6053), up to 0.5 gpm (D6105 tantalum); 1255: 2 to 130 CCM (D1053), 0.1 to 1.3 LPM (D1083) |
| Gases with listed tables | Air, nitrogen, oxygen, argon, carbon dioxide, hydrogen; millimetre scale with data tables |
| Maintenance | EZ-CHANGE interchangeable tube assemblies |
Reading the Sho-Rate model code
The sample code in the datasheet reads 1250A D6011 A C S V V. The base code is 1250A (65 mm) or 1255A (150 mm), followed by a tube number from the capacity tables, a letter for the fluid (air, carbon dioxide, millimetre, nitrogen, oxygen, argon, water or hydrogen), a unit of measure (CCM, SCFH, GPH, LPM, ml/min, GPM or millimetre), the end-block material and connection (1/8 inch FNPT aluminium or stainless steel, or 1/4 inch FNPT stainless steel), a valve designation (none, standard inlet valve or outlet valve for vacuum or water service) and the O-ring (Buna for aluminium only, Viton for stainless steel only).
For low-flow glass tube meters with alarms, flow controllers or customised reference conditions, Brooks points to the Sho-Rate 135X product line instead.
What to confirm before ordering
Tell us the fluid, flow range and units, operating pressure and temperature relative to the reference conditions, connection size and thread, valve position, end-block material, and whether the meter will be panel mounted. Because the stated accuracy applies at reference conditions, process conditions that differ from 70 F and 14.7 psia should be mentioned so the scale can be matched. Glass tube meters should not be used with fluids that attack glass or at conditions beyond the stated limits.
Documents and quotation
The manufacturer datasheet (8 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 1250 and 1255 datasheet 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 at a glance
| 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 |
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 1250 and 1255?
The 1250 has a 65 mm scale and 5 percent accuracy; the 1255 has a 150 mm scale and 3 percent accuracy.
What is the pressure and temperature rating?
200 psig (13.8 bar) at 33 to 250 F (1 to 121 C).
Which connections are available?
1/8 inch NPT in aluminium or stainless steel, and 1/4 inch NPT in stainless steel, with locknuts.
Can the meter have a valve?
Yes. A cartridge valve in stainless steel or brass can be fitted at the inlet, or at the outlet for vacuum or water service.
What gases have scales?
Air, nitrogen, oxygen, argon, carbon dioxide and hydrogen are in the capacity tables, with other gases on request.
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