Brooks Instrument Sho-Rate 1255 Variable Area Flowmeter
About this part
1255AD1084ALSVV 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 D1084 in the Model 1255 air direct-reading table as a 1 to 50 LPM air tube/float configuration. distributor catalog evidence identifies this exact configured part number with air, LPM scale, 1/8 inch FNPT, Viton seal, panel-mount, vertical, glass flowmeter context. Final suitability still depends on the physical unit label, scale, valve arrangement, end-block material, seal material, process fluid, pressure, temperature, and application requirements
Unit-specific configuration
Observed configuration
Historical listing records identify AIR at 1 to 50 LPM. 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
1255AD1084ALSVV
Base model context
Brooks model-code documentation identifies 1255A as the 150 mm tube flowmeter base model
Flow
Measuring principle
Variable area flowmeter with tapered borosilicate glass metering tube and metering float
D1084 reference range
Brooks 1250/1255 documentation lists D1084 in the Model 1255 Air direct-reading table with Carboloy 1/4 inch float and 1 to 50 LPM air range
Observed distributor range
Distributor catalog pages for the exact manufacturer part number identify the commercial item as an air flowmeter with 2 to 50 LPM or 1 to 50 LPM range wording; use the Brooks D1084 table and the physical scale for final interpretation
Configuration
Code interpretation boundary
The configured code is consistent with 1255A base model, D1084 tube/table context, air service, LPM unit-of-measure context, 1/8 inch FNPT stainless end-block context, standard valve context, and Viton O-ring context; verify installed hardware from the physical label
Configured-unit rule
Tube number, float material, direct-reading scale, 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
D1084 float material
Brooks 1250/1255 documentation lists D1084 with Carboloy float material and 1/4 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/LPM configuration
