Brooks Instrument Sho-Rate 1255A R1031 Air Flowmeter
About this part
1255AR1031MRSVV is a configured Brooks Instrument Sho-Rate 1255A low-flow glass tube variable-area flowmeter. Official Brooks 1250/1255 documentation identifies the 1255A as the 150 mm tube flowmeter base model and lists R1031 as a millimeter-scale tube entry with glass float, 1/8 inch float diameter, and 400 CCM air table value. The exact full configured identifier was corroborated by distributor pages, but no verified official Brooks exact-part build sheet or exact-part PDF naming 1255AR1031MRSVV is currently available
Configurations vary. Verify the exact unit before choosing a replacement.
Application classLife sciences and laboratory automation
CategoryFlow Control
Specifications
Identification
Device type
Direct-reading glass tube variable-area flowmeter
Series family
Brooks Sho-Rate 1250/1255 Series
Configured model code
1255AR1031MRSVV
Base model context
Current Brooks 1250/1255 model-code documentation identifies 1255A as the 150 mm tube flowmeter base model
Flow
Measuring principle
Variable-area rotameter with glass metering tube and float
Configured tube code context
Brooks 1250/1255 millimeter-scale tables list R1031 for Model 1255 with glass float, 1/8 inch float diameter, and 400 CCM air table value
Observed exact-SKU range context
Exact distributor pages describe 1255AR1031MRSVV as an air variable-area flowmeter with 0 to 400 cc/min range; stored Sonisys auction titles also show 0 to 400 CCM air wording
Performance
1255 accuracy context
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 / Temperature
Series pressure and temperature rating
Brooks 1250/1255 documentation lists 200 psig from 33 deg F to 250 deg F / 13.8 bar from 1 deg C to 121 deg C
Construction
Metering tube material
Borosilicate glass
Float material context
The R1031 tube entry uses float material code G, which Brooks identifies as glass
Brooks model-code documentation maps end-block material code S to 1/8 inch FNPT stainless steel
Controls
Valve context
Brooks model-code documentation includes no-valve, standard inlet-valve, and limited outlet-valve configurations; the V valve code is treated as standard inlet-valve context, subject to physical label confirmation
Seals
O-ring context
Brooks model-code documentation maps O-ring code V to Viton for stainless-steel configurations
Installation
Mounting orientation
Brooks installation and distributor documentation describe the meter as a vertical, panel-mounted variable-area flowmeter
Configuration
Configured-unit rule
Tube, float, scale, connection, end-block material, valve arrangement, seal material, calibrated fluid, and flow curve vary by configured code and unit label
Applications
Application domain
Low-flow gas and liquid indication, panel-mounted flow indication, purge service, laboratory flow measurement, industrial flow measurement, air service, and OEM flowmeter applications
