Flow Control
1020CLA1H91AA
Brooks Instrument GT1000 Glass-Tube Variable-Area Flowmeter
About this part
Brooks Instrument 1020CLA1H91AA is a configured GT1000-series industrial glass-tube variable-area flowmeter for visual flow indication. The 1020 base designation identifies a horizontal-inlet, horizontal-outlet arrangement. A surviving exact-listing photograph shows a direct-reading SCFM scale for air at 70 °F and 14.7 psia; the listing describes a 0–10.5 range. The legacy suffix CLA1H91AA cannot be safely decoded with the later 1020N ordering table
Configurations vary. Verify the exact unit before choosing a replacement.
No archived photo available
Key Facts
Specifications
| Manufacturer | Brooks Instrument |
| Exact configured identifier | 1020CLA1H91AA |
| Product family | GT1000 industrial glass-tube variable-area flowmeters |
| Base-model orientation | 1020 designation: horizontal inlet and horizontal outlet |
| Operating principle | Variable-area measurement using a float in a tapered glass metering tube |
| Supported media | Liquids and gases; calibration and scale are application-specific |
| Standard accuracy | ±2% of full scale; optional ±1% of full scale |
| Repeatability | ≤0.5% of full scale |
| Meter fluid-temperature range | 33–250 °F (1–121 °C) |
| Ambient-temperature range | 33–125 °F (1–52 °C) |
| Metering-tube material | Borosilicate glass |
| Window material | Polycarbonate with UV inhibitor |
| Scale formats | Single or dual detachable scale; direct-reading, millimeter, or percentage graduations depending on configuration |
| Connection options | NPT or BSPT/RC female threaded connections; ANSI B16.5 Class 150 raised-face flanges available with stainless-steel fittings |
| Exact pressure rating | Depends on meter size and connection type and cannot be assigned from the undecoded legacy suffix alone |
| Exact wetted materials and calibration | Float, end fittings, O-rings, connection size, fluid, engineering units, and reference conditions require the unit nameplate, scale, or calibration record |
Identifier interpretation
Only the base designation can be decoded conservatively from current manufacturer documentation; the remaining characters belong to an earlier configured-code format.
Current retrofit relationship
Brooks Instrument identifies the GT1600 Series as configurable to retrofit existing GT1000 meters. This is a family-level replacement path, not a universal one-for-one substitute: tube capacity, calibrated fluid and range, connection orientation and size, wetted materials, seals, valve, alarms, and mounting must be matched before replacement.
Safety and service notes
- Keep the protective sleeve over the glass tube where fitted and keep the meter windows securely fastened.
- Do not exceed the applicable pressure or temperature limits, and avoid pressure and flow surges that can damage the glass tube.
- Depressurize the process line before disassembly, cleaning, or repair.
- For GT1000 sizes 7–13, the manufacturer specifically requires the plastic protective sleeve to remain over the glass tube.
- The GT1000 data sheet warns that solenoid valves can create pressure shocks capable of damaging the glass tube.
Documentation Downloads
Local PDF copiesPart Photos
0 imagesHistorical archive images for identification, labels, connectors, and condition reference, not current inventory.
Historical Listings & Prices
Historical listing data, not a current offerThe typical recorded price range is $135.00 to $135.00. Based on 1 archived listing record; not a current offer, appraisal, or confirmed sale price.
View archived listing titles
- BROOKS 1020CLA1H91AA VARIABLE AREA FLOW METER 0-10.5 T169675