1255AR1071MRSVV is a configured Brooks Instrument Sho-Rate 1255A low-flow glass tube variable-area flowmeter identifier. Official Brooks 1250/1255 documentation places the 1255A base model in the 150 mm tube flowmeter family and lists R1071 in the Model 1255 millimeter-reference capacity table with a glass float, 1/4 inch float diameter, 9180 CCM air, and 215 CCM water reference capacities. distributor catalog pages identify this exact configured part number with 0 to 9180 CCM air and 0 to 215 CCM water context, but final suitability still depends on the physical unit label, tube/float assembly, scale, valve configuration, end-block material, seals, process fluid, pressure, and temperature
Configurations vary. Verify the exact unit before choosing a replacement.
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
R1071 reference capacity
Brooks 1250/1255 documentation lists R1071 with glass float, 1/4 inch float diameter, 9180 CCM air, and 215 CCM water in the Model 1255 millimeter-reference capacity table
Observed exact-SKU range context
Exact distributor pages describe 1255AR1071MRSVV with 0 to 9180 CCM air and 0 to 215 CCM water range context
Configuration
Code interpretation boundary
The configured code is consistent with 1255A base model, R1071 tube/table context, millimeter scale context, 1/8 inch FNPT stainless end-block context, and Viton O-ring context; verify valve arrangement and 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 documentation 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 documentation lists Model 1255 accuracy as +/-3% full scale at reference conditions for listed gases
Repeatability
Brooks 1250/1255 documentation lists repeatability as 0.25% full scale
Pressure and temperature
Series-level pressure/temperature
Brooks 1250/1255 documentation 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 documentation lists borosilicate glass, aluminum, 316 stainless steel, clear polycarbonate, and Teflon materials of construction depending on configuration
Float material context
The R1071 tube entry uses float material code G, which Brooks identifies as glass
Seal options
Brooks 1250/1255 documentation lists Buna and Viton packing/O-ring options
Connections
Connection options
Brooks 1250/1255 documentation 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-SKU connection context
Exact distributor pages list 1255AR1071MRSVV with 1/8 inch FNPT connection context
Valve
Valve options
Brooks 1250/1255 documentation lists cartridge valve options with stainless steel or brass valve materials; exact valve arrangement should be confirmed on the physical unit
Installation
Mounting orientation
Brooks installation documentation and exact distributor catalog pages describe vertical orientation for this style of panel-mount variable-area meter
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; exact gas/liquid use is configuration and scale dependent
