Brooks Instrument Model 1305 Glass-Tube Variable-Area Flowmeter
About this part
1305EJ18CJ2BA is a Brooks Instrument Model 1305 O-ring-sealed glass-tube variable-area flowmeter configured for direct indication of 0–1.5 gpm water at specific gravity 1.0 and viscosity 1.0 cP. The configured meter uses a size-8 R-8M-75-1 tube, an 8-RJ-10 float, 1/2-inch female NPT vertical connections, 316 stainless-steel end fittings, Viton O-rings, aluminum side plates, and no listed accessory
Configurations vary. Verify the exact unit before choosing a replacement.
Application classIndustrial automation and process equipment
CategoryFlow Meters
Specifications
Identification
Manufacturer
Brooks Instrument
Product family
Model 1305 / GT1305
Measurement
Measuring principle
Variable area
Indication
Direct-reading glass metering tube
Configured capacity
Calibrated fluid
Water
Full-scale flow
1.5 gpm
Calibration conditions
Specific gravity 1.0; viscosity 1.0 cP
Full-scale pressure drop
9 inches water column
Tube
R-8M-75-1, size 8
Float
8-RJ-10
Performance
Standard accuracy
±10% of full scale from 100% to 10% of scale reading
Repeatability
1% of full scale
Scale
Range and units
0–1.5 gpm water, direct reading on tube
Usable scale length
75 mm (3 in)
Process limits
Maximum operating pressure
200 psig (13.8 bar) for the size-8 female-threaded meter
Maximum rated temperature
250°F (121°C); fluid-specific restrictions still apply
Ambient temperature
33–125°F (1–52°C)
Connections
Process connections
1/2-inch female NPT
Orientation
Vertical inlet and outlet; inlet at bottom and outlet at top
Construction
Metering tube
Borosilicate glass
Float and float stops
316 stainless steel
End fittings
316 stainless steel
O-rings
Viton fluoroelastomer
Side plates
Aluminum
Protective sleeve and window
UV-stabilized polycarbonate; window is scratch resistant
Fasteners
300-series stainless steel
Configuration
Accessories
None specified by terminal code A
Dimensions
Approximate overall dimensions
7.75 in high × 2.375 in wide × 2.375 in deep (196.85 × 60.33 × 60.33 mm)
Model-code interpretation
The suffix interpretation follows the official Model 1305 code table and agrees with the independently transcribed markings of an exact-identifier unit. The legacy 1305E base revision predates the published table, whose threaded base code is 1305F; 1305F is therefore not treated as an exact alias.
Code segment
Selected code
Meaning
I–V
1305E
Legacy Model 1305 base identifier; exact unit evidence identifies it as a threaded Model 1305 flowmeter
VI–VII
J1
Size 8 with R-8M-75-1 metering tube
VIII–IX
8C
8-RJ-10 float
X–XI
J2
On-tube GPM water scale for specific gravity 1.0 and viscosity 1.0 cP
XII
B
316 stainless-steel fittings, Viton O-rings, and aluminum side plates
XIII
A
No accessory
Resulting capacity
J1 + 8C + J2
0–1.5 gpm water with approximately 9 inches water-column pressure drop at full scale
Installation and safety requirements
The glass-tube construction requires the operating and service precautions stated in the Model 1305 manual.
Mount within 6 degrees of true vertical, with the inlet at the bottom and outlet at the top.
Keep the plastic protective sleeve over the glass tube and secure the meter windows before operation.
Do not exceed the pressure or temperature ratings, and avoid pressure and flow surges.
Do not service or repair the meter while it is pressurized.
For this water-calibrated configuration, the manual prohibits water service above 140°F even though the size-8 assembly has a 250°F mechanical rating.
Do not use the glass-tube meter with toxic fluids or media that react with glass, including steam, alkalis, fluorine, hydrofluoric acid, or molten metal.
Install new O-rings whenever the meter is removed for service, then have qualified personnel pressure-test it before returning it to service.
Replacement context
Brooks identifies the GT1600 Series as configurable to retrofit GT130x meters. This is a family-level migration path rather than an exact replacement designation for 1305EJ18CJ2BA; connection geometry, 1.5 gpm water calibration, wetted materials, pressure rating, and scale requirements must be matched when selecting a GT1600 configuration.
