Flow Control
1020NM0A2AA3F9C00001
Brooks Instrument GT1020 Glass-Tube Variable-Area Flowmeter
About this part
Brooks Instrument 1020NM0A2AA3F9C00001 is a legacy GT1000-series model GT1020 variable-area flowmeter. Its ordering code specifies a size-10 R-10M-25-3FT metering tube, horizontal inlet and outlet, a 10-RV-64 standard float, 316 stainless-steel end fittings, Viton O-rings, 3/4-inch female NPT connections, a right-side direct-reading gas scale, and ±2% full-scale accuracy. Stored photographs show two exact-code units and confirm a 25 SCFM air scale at 70 °F and 14.7 psia. This configuration has no alarm, relay, needle valve, panel-mount option, or special certificate option
Configurations vary. Verify the exact unit before choosing a replacement.
Key Facts
Specifications
| Manufacturer | Brooks Instrument |
| Product family | GT1000 Series |
| Base model | GT1020 / ordering-code base 1020N |
| Measurement principle | Glass-tube variable-area flow measurement (rotameter) |
| Meter size | Size 10 |
| Metering tube | R-10M-25-3FT rib-guided borosilicate-glass tube |
| Float | 10-RV-64 standard float, 316 stainless steel |
| End-fitting material | 316 stainless steel |
| O-ring material | Viton fluoroelastomer |
| Inlet and outlet orientation | Horizontal inlet and horizontal outlet |
| Connection type | Female NPT threaded |
| Connection size | 3/4 inch |
| Scale configuration | Right-side direct-reading gas scale; no left-side scale |
| Accuracy | ±2% of full scale |
| Repeatability | ≤0.5% of full scale |
| Alarm and relay | None |
| Needle valve or flow controller | None |
| Panel mounting | None |
| Process and calibration certificates | No optional oxygen-service declaration or International Calibration Certificate specified |
| Branding | Standard Brooks identification |
| Maximum non-shock operating pressure | 175 psig (12.1 bar) for the configured size-10 NPT meter, at fluid temperatures up to 250°F (121°C) |
| Operating-fluid temperature range | 33 to 250°F (1 to 121°C) |
| Ambient temperature range | 33 to 125°F (1 to 52°C) |
| Window | Polycarbonate with UV inhibitor |
| Float stops | 316 stainless-steel springs for size 10 |
| Housing | Epoxy-painted cast aluminum |
| Hardware | Stainless steel |
Model-code decoding
The manufacturer’s GT1000 ordering table divides the identifier into sixteen configuration positions.
| Position | Code | Decoded configuration |
|---|---|---|
| I | 1020N | GT1020 base model; horizontal inlet and horizontal outlet |
| II | M | Size 10; R-10M-25-3FT tube |
| III | 0 | No alarm switch, sensor, or relay |
| IV | A | 10-RV-64 standard float |
| V | 2 | 316 stainless-steel end fittings |
| VI | A | Viton O-rings |
| VII | A | Female NPT threaded connections |
| VIII | 3 | 3/4-inch connections |
| IX | F | Right-side direct-reading gas scale |
| X | 9 | No left-side scale |
| XI | C | ±2% full-scale accuracy |
| XII | 0 | No needle valve or flow controller |
| XIII | 0 | No panel-mounting option |
| XIV | 0 | No optional process certificate |
| XV | 0 | No additional certificate requirement |
| XVI | 1 | Standard Brooks identification |
Reference tube-and-float capacity
These values are the manufacturer’s standard water-and-air sizing data for the selected R-10M-25-3FT tube with 10-RV-64 float. They are not a substitute for the configured unit’s engraved gas, calibration conditions, units, and scale range.
| Characteristic | Water reference | Air reference |
|---|---|---|
| Full-scale capacity | 6.2 gpm (1,400 l/h) | 25 scfm (40 m³n/h) |
| Pressure drop | 12 in. water column (3 kPa) | 14 in. water column (3.5 kPa) |
| Viscosity-immunity ceiling | 15 cSt at specific gravity 1.0 | Not specified |
| Required downstream pressure | Not applicable | 0 psig (0 bar) |
Installation and glass-tube safety
Applicable operating precautions for this size-10 GT1000 configuration.
- Mount the flowmeter within 6 degrees of true vertical, with the inlet at the bottom.
- Keep the protective sleeve over the glass tube and fasten the meter window securely.
- Initiate flow slowly and avoid pressure or flow surges.
- Depressurize the process line before service or repair.
- Drain liquid completely if adjacent inlet and outlet valves will both be closed; trapped-liquid thermal expansion can rupture the meter.
- Do not use a solenoid valve in a manner that can impose pressure shock on the glass tube.
Replacement relationship
Brooks identifies the GT1000 as a legacy series and the GT1600 Series as its configurable retrofit replacement family. A replacement must be selected for the original flow calibration, process fluid, materials, pressure and temperature limits, connection geometry, scale, and options; GT1600 is not an automatic one-code substitute for this exact identifier.
Documentation Downloads
Local PDF copiesPart Photos
10 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 $417.17 to $490.80. Based on 2 archived listing records; not a current offer, appraisal, or confirmed sale price.
View archived listing titles
- Brooks 1020NM0A2AA3F9C00001 Gt 1000 Flow Meter