Brooks Instrument Model 1305 / GT1305 Glass Tube Variable-Area Flowmeter
About this part
1305FJ1BCP3AA is a configured Brooks Instrument Model 1305 / GT1305 glass tube variable-area flowmeter identifier observed in Sonisys auction records and surplus listing context. Official Brooks GT1600 documentation identifies 1305 / GT1305 as legacy retrofit model context for Brooks glass tube variable-area flowmeters, and Brooks-branded legacy 1305 literature describes the Model 1305 family as an O-ring-seal glass tube flowmeter. The full configured identifier 1305FJ1BCP3AA was not found in an official Brooks PDF or product page; flow range, tube, float, scale, process fluid, connection, materials, pressure rating, temperature rating, and approvals should be verified from the physical unit label and scale
Unit-specific configuration
Observed configuration
Historical listing records identify this part as 0.47-4.7 GPM. 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 classIndustrial automation and process equipment
CategoryFlow Control
Specifications
Identification
Configured part identifier
1305FJ1BCP3AA
Device type
Glass tube variable-area flowmeter / rotameter
Series family
Brooks Model 1305 / GT1305 legacy glass tube variable-area flowmeter family
Official retrofit context
Brooks GT1600 documentation lists GT1305 / 1305 as retrofit model context for legacy Brooks glass tube variable-area flowmeters
Function
Measuring principle
Variable-area flow indication using a tapered glass metering tube and float
Applications
Model 1305 application context
Brooks-branded Model 1305 literature describes use for purge service, seal oil systems, bearing lubrication, and cooling-water indication where high metering accuracy is not required
Flow
Model 1305 family capacity context
Brooks-branded Model 1305 literature lists family capacity ranges of 0.8 to 25 gpm water and 3 to 50 scfm air; exact configured scale for 1305FJ1BCP3AA must be read from the unit
Scale
Model 1305 scale context
Brooks-branded Model 1305 literature lists a 75 mm scale length with standard on-tube printed linear scale and optional detachable printed scale configurations
Performance
Model 1305 accuracy context
Brooks-branded Model 1305 literature lists standard accuracy as +/-10% full scale and optional accuracy as +/-5% full scale from 100% to 10% of scale reading
Model 1305 repeatability context
Brooks-branded Model 1305 literature lists repeatability as 1% full scale
Construction
Model 1305 construction context
Brooks-branded Model 1305 literature describes O-ring seal construction, borosilicate glass metering tube, UV-stabilized polycarbonate protective sleeve/window, 316 stainless steel float and stops, aluminum side plates, brass or 316 stainless steel end fittings, and Buna-N or Viton-A O-ring options
Connections
Model 1305 connection context
Brooks-branded Model 1305 literature describes standard female NPT connections with vertical inlet and vertical outlet orientation; exact connection size on 1305FJ1BCP3AA must be verified from the unit
Pressure and temperature
Model 1305 pressure and temperature context
Brooks-branded Model 1305 literature lists pressure and temperature ratings by meter size and configuration; published examples include 200 psig for size 8 and 150 psig for size 10 female-threaded units at 250 deg F / 121 deg C
Installation
Orientation
Brooks-branded Model 1305 installation literature states the meter should be mounted within 6 degrees of true vertical with inlet at the bottom and outlet at the top
Configuration
Configured-unit rule
Tube, float, scale, calibrated fluid, direct-reading units, connection size, end-fitting material, seal material, pressure rating, temperature rating, alarms, and approvals vary by configured code and unit label
Observed variants
Stored and external listing context
Stored Sonisys auction evidence and external surplus listing context identify this exact configured code as a Brooks variable-area flowmeter and include 0.47-4.7 GPM and 1/2 inch NPT wording; these are observed listing values, not official model-wide specifications
