Brooks Instrument Sho-Rate 1255 Variable Area Flowmeter
About this part
1255AR1011MRSVV is a configured Brooks Instrument Sho-Rate 1255 glass tube variable area flowmeter identifier. Brooks official 1250/1255 documentation places the 1255 family in low-flow glass tube variable area flowmeters and lists R1011 in the Model 1255 millimeter-reference capacity table with 50 CCM air reference capacity using a glass 1/8 inch float. Stored Sonisys auction records and distributor catalog evidence identify this exact configured part number with 0 to 50 CCM air context, but final suitability still depends on the physical unit label, tube/float assembly, scale, end-block material, valve configuration, seals, process fluid, pressure, and temperature
Unit-specific configuration
Observed configuration
Historical listing records identify this part as AIR at 0-50 CCM. Exact gas, range, fittings, valve configuration, and communication interface must be verified from the physical unit label.
Configurations vary. Verify the exact unit before choosing a replacement.
Application classLife sciences and laboratory automation
CategoryFlow Control
Specifications
Identification
Device type
Sho-Rate 1255 glass tube variable area flowmeter / rotameter
Series family
Brooks Sho-Rate 1250/1255 low-flow glass tube variable area flowmeters
Configured part number
1255AR1011MRSVV
Base model context
Brooks model-code documentation identifies 1250A as the 65 mm tube flowmeter base model and 1255A as the 150 mm tube flowmeter base model
Flow
Measuring principle
Variable area flowmeter with tapered borosilicate glass metering tube and metering float
Observed stored auction range
Stored auction titles describe this configured part as Flow Range at CCM of Air 0-50
R1011 reference capacity
Brooks 1250/1255 documentation lists R1011 with glass 1/8 inch float and 50 CCM air capacity in the Model 1255 millimeter reference scale capacity table
Configuration
Code interpretation boundary
The configured code is consistent with 1255A base model, R1011 tube/table context, millimeter scale context, stainless 1/8 inch FNPT end-block context, standard inlet valve context, and Viton seal context; verify installed hardware from the physical label
Configured-unit rule
Tube number, float material, reference scale, flow units, end-block material, connection, valve, O-ring material, and process-fluid assumptions must be verified from the specific unit and documentation
Reference conditions
Brooks 1250/1255 data sheet states reference conditions of 70 F (21.1 C) and 14.7 psia (1 bar absolute) for listed gas accuracy context
Performance
1255 family accuracy
Brooks 1250/1255 data sheet lists 1255 accuracy as +/-3% full scale at reference conditions for listed gases
Repeatability
Brooks 1250/1255 data sheet lists repeatability as 0.25% full scale
Pressure and temperature
Series-level pressure/temperature
Brooks 1250/1255 data sheet lists 200 psig from 33 F to 250 F / 13.8 bar from 1 C to 121 C; verify the configured unit and application before using this limit
Materials
Series-level materials
Brooks 1250/1255 data sheet lists borosilicate glass, aluminum, 316 stainless steel, clear polycarbonate, and Teflon in materials of construction
R1011 float material
Brooks 1250/1255 documentation lists R1011 with glass float material and 1/8 inch float diameter
Seal options
Brooks 1250/1255 data sheet lists Buna and Viton packing/O-ring options; distributor catalog pages identify Viton seal/O-ring context for this exact configured part
Connections
Connection options
Brooks 1250/1255 data sheet lists 1/8 inch NPT with locknuts for aluminum or stainless steel and 1/4 inch NPT with locknuts for stainless steel only
Observed exact-part connection
Distributor catalog pages for this exact manufacturer part number identify a 1/8 inch FNPT process connection
Valve
Valve options
Brooks 1250/1255 data sheet lists cartridge valve options with stainless steel or brass valve materials
Maintenance
Tube assembly service
Brooks documentation describes quick removal or installation of tube and float while the meter remains in process piping, and the data sheet describes EZ-CHANGE tube assembly interchangeability
Applications
Application domain
Low-flow gas and liquid indication in laboratory, industrial, and OEM applications; this configured part is identified by source evidence as an air/CCM configuration
