Flow Control
R-2-15-B
Brooks Instrument Sho-Rate 150 mm Glass Metering Tube
About this part
R-2-15-B identifies a Brooks Instrument Sho-Rate tapered glass metering tube rather than a complete configured flowmeter. Current Revision G documentation lists the tube as R-2-15-B G for meter size 2 in the 150 mm 1355G series. The separately selected spherical float determines the documented full-scale capacity; the tube number does not establish float material, scale, calibration accuracy, fittings, seals, valve, or alarm configuration
Configurations vary. Verify the exact unit before choosing a replacement.
No archived photo available
Key Facts
Specifications
| Manufacturer | Brooks Instrument |
| Product line | Sho-Rate 1355 Series |
| Component type | Rib-guide tapered glass metering tube |
| Current Revision G notation | R-2-15-B G |
| Metering-tube material | Precision-bore borosilicate glass |
| Meter size | 2 |
| Nominal scale length | 150 mm in the 1355-series configuration |
| Measuring principle | Variable area, using a spherical float in a tapered tube |
| Documented float selections | Glass, sapphire, 316 stainless steel, Carboloy, or tantalum; the exact float is not encoded by R-2-15-B |
| Documented scale selections | Millimeter, linear, custom decal, or percent scale; selected separately in the complete meter code |
| Repeatability | 0.25% of full scale |
| Pressure and temperature rating | 200 psig from 33°F to 250°F; 13.8 bar from 1°C to 121°C |
| Mounting orientation | Within 6 degrees of true vertical, with the inlet at the bottom |
| Float reading point | Center of the spherical float |
What Does R-2-15-B Mean?
Brooks publishes R-2-15-B as a complete tube number. Its hyphenated characters should not be independently decoded beyond the manufacturer-defined model-code relationship.
| Segment | Field | Interpretation |
|---|---|---|
| R-2-15-B | Brooks tube number | Metering tube listed for meter size 2 in the 150 mm Sho-Rate 1355 series. |
| B in position VII of a 1355G model code | Tube selection | Selects tube R-2-15-B G in a complete Revision G meter code. |
| Not encoded | Float and scale | Float material, scale format, and accuracy selection occupy separate positions in the complete meter code. |
1355G Reference Capacity by Float
These manufacturer-published full-scale values apply to R-2-15-B G paired with the listed spherical float in a 1355G meter. They are conditional tube-and-float combinations, not specifications for every R-2-15-B assembly. Air values use 70°F and 14.7 psia reference conditions.
| Float material | Water full scale | Air full scale |
|---|---|---|
| Glass | 53 cc/min | 2.3 SLPM |
| Sapphire | 80 cc/min | 3.0 SLPM |
| 316 stainless steel | 130 cc/min | 4.6 SLPM |
| Carboloy | 200 cc/min | 6.7 SLPM |
| Tantalum | 210 cc/min | 7.1 SLPM |
Configuration and Accuracy Boundary
R-2-15-B identifies the metering tube but does not define the complete flowmeter configuration or its accuracy class. Exact capacity and accuracy require the float and scale codes from the full model number, the physical scale or label, and any calibration certificate. Revision G specifications and capacities should not be asserted for the auction-observed 1355C assembly without a manufacturer cross-reference.
Service Notes
- Inspect the tube and float periodically; deposits can cause inaccuracy or float sticking.
- Clean the borosilicate metering tube only with a solvent that does not attack glass.
- Avoid chipping the tube when removing float stops or the float.
- After reassembly, Brooks specifies an air leak test at a minimum of 15 psig at room temperature.
Documentation Downloads
Local PDF copiesPart Photos
0 imagesHistorical archive images for identification, labels, connectors, and condition reference, not current inventory.
Historical Listings & Prices
Historical listing data, not a current offerThe typical recorded price range is $34.42 to $34.42. Based on 1 archived listing record; not a current offer, appraisal, or confirmed sale price.
View archived listing titles
- Brooks Instrument 1355C SHO-RATE Variable Area Flowmeter - 1335CB1C7AAG R-2-15-B