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Brand: Brooks Instrument
Brooks Instrument GF040 MultiFlo Gas Mass Flow Controller
Description
One mass flow controller for many gases and ranges
The GF040 is the base model of the Brooks GF40 Series, an elastomer-sealed digital thermal mass flow controller and meter built around the MultiFlo technology. Switching a thermal controller from one gas to another normally relies on simple correction factors, which cannot fully account for differences in viscosity and density. MultiFlo instead draws on a database of gas runs to apply gas-specific correction functions, so the gas and the full-scale range can be changed without removing the device from the line.
Brooks says setup takes under 60 seconds and presents the series for OEMs and users in fields such as solar, biotech and nanotechnology, and for laboratories that change gas or range often. The sensor is Hastelloy, and the meter version has no valve.
Technical specifications
| Parameter | Specification |
|---|---|
| Base model code | GF040: elastomer sealed, 0 to 50 slpm |
| Full-scale range (N2 eq.) | 3 sccm to 50 slm |
| Flow accuracy | +/-1% of setpoint (35 to 100%), +/-0.35% FS (2 to 35%) |
| Repeatability and reproducibility | Under +/-0.2% of setpoint |
| Linearity | +/-0.5% FS (included in accuracy) |
| Response time | Normally closed valve under 1 s; normally open valve under 3 s (within 2%, steps 0-10 to 0-100%) |
| Control range | 2 to 100% |
| MultiFlo bins | 10 bins as standard |
| Valve shut-down | Under 1% FS; auto shut-off below 0.5% FS setpoint |
| Zero stability | Under +/-0.5% FS per year |
| Pressure coefficient | 0.03% per psi (0 to 50 psi N2) |
| Attitude sensitivity | Under 0.25% span change at 90 degrees after re-zeroing (N2 at 50 psi) |
| Operating temperature | 5 to 50 C (41 to 122 F) |
| Maximum operating pressure | 150 psig (10 bar); design proof pressure 4000 psig (275 bar) |
| Differential pressure | 7 to 45 psid up to 860 sccm; 15 to 45 psid for 861 to 7200 sccm; 25 to 45 psid for 7201 to 50000 sccm |
| External leak integrity | 1×10-9 atm cc/sec He |
| Wetted materials | 316 stainless steel, Hastelloy C-22, 17-7 PH, 430 SS; surface finish 32 micro-inch Ra |
| Seals and valve seat | Viton, Buna, Kalrez or EPDM |
| Valve type | Normally closed, normally open, or no valve (meter) |
| Interfaces | RS485 (S, L and A protocols), Profibus, DeviceNet, EtherCAT; analog 0-5 V, 0-10 V, 0-20 mA, 4-20 mA |
| Power | 12 to 24 Vdc RS485/analog; 13.5 to 27 Vdc Profibus and EtherCAT; 11 to 25 Vdc DeviceNet (7 W, 8 W purge) |
| Compliance | CE EN 61326, designed to EN 61010-1 safe area, RoHS |
How the GF040 model code is built
Position II states whether the device is MultiFlo capable. Position IV picks a normally closed valve, normally open valve or meter. Position V holds the gas code and range, or one of the standard bins numbered SA40 to SA50, from 3 to 10 sccm up to 30001 to 50000 sccm nitrogen equivalent. Fittings run from 9/16-18 UNF through tube compression in inch and metric sizes, BSP, VCR, VCO and NPT. Downstream condition (atmosphere, vacuum or positive pressure) and the seal material are separate positions, and the final position selects the communication and connector combination.
Brooks lists optional general, leak-test traceability, oxygen cleaning, calibration traceability and material certification documents.
What to confirm before ordering
Give us the gas or gases to be run, the range you need now and in future, the pressure upstream and downstream, whether the outlet sees vacuum, the fitting, the seal material and the control protocol. The datasheet notes that dense gases such as argon need roughly 10 psid extra differential pressure, so mention the gas density when sizing the unit.
How the Brooks Instrument GF040 works
A small part of the gas flows through a heated sensor tube. The gas carries heat from one point to another, and the temperature difference shows the mass flow. The controller compares this with the set point and moves the valve. The MultiFlo database corrects the reading for the chosen gas.
Where the GF040 is used
- Solar cell production
- Biotech equipment
- Nanotechnology tools
- Laboratory gas systems
- OEM process equipment
Selection checklist for the GF040
- Gas to be controlled
- Full-scale flow range
- Controller or meter version
- Valve type, closed or open
- Seal material
- Inlet and outlet pressure
- Digital interface
- Power supply
Installation, commissioning and maintenance notes for the GF040
Mount the device on a stable surface with clean gas lines. Make sure the pressure drop is within the stated band. Connect the power and the interface cable. Select the gas and the range in the software. Let it warm up and zero it with no flow.
Requesting a quotation for the Brooks Instrument GF040
Please send the gas, the flow range and the pressure conditions. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.
GF040 flow range
The range runs from 3 sccm to 50 slm of nitrogen equivalent.
GF040 accuracy
The accuracy is plus or minus 1 percent of setpoint from 35 to 100 percent.
GF040 repeatability
The repeatability is under plus or minus 0.2 percent of setpoint.
GF040 control range
The control range is 2 to 100 percent.
GF040 response time
A normally closed valve responds in under 1 second.
GF040 MultiFlo bins
There are 10 MultiFlo bins as standard.
GF040 sensor
The sensor is made of Hastelloy.
GF040 wetted materials
They include 316 stainless steel and Hastelloy C-22.
GF040 seals
Seals can be Viton, Buna, Kalrez or EPDM.
GF040 operating temperature
It works from 5 to 50 degrees C.
GF040 maximum pressure
The maximum operating pressure is 150 psig or 10 bar.
GF040 interfaces
Options include RS485, Profibus, DeviceNet, EtherCAT and analog signals.
Flow controller records for the GF040
Record the gas selected, the range and the date of each zero check.
Choosing the right GF040 valve
Choose a normally closed valve when the gas must shut off on power loss.
Documents and quotation
The manufacturer datasheet is attached to this page as a download. For a quotation, send the full model code and the process data to Seven Star LLC in Muscat; browse more instruments in the Flowmeters category. We supply this item as an independent supplier, so please confirm availability and delivery with us.
Datasheets & Documents
- Datasheet Brooks Instrument GF40 Series datasheet Download
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About brand
Brooks Instrument makes mass flow controllers, flowmeters and pressure and vacuum instruments for gases and liquids. The industrial chemist Stephen A. Brooks started the business in 1946 as the Brooks Rotameter Company near Philadelphia, building variable area flowmeters. After many years as part of Emerson, Brooks was sold to American Industrial Partners at the end of 2007 and has been a division of Illinois Tool Works (ITW) since January 2012. It is headquartered in Hatfield, Pennsylvania.
Seven Star LLC is an independent supplier listing Brooks Instrument thermal and Coriolis mass flow controllers and variable area flowmeters for buyers in Oman and the GCC. Instruments are matched from the model code and the gas, range and calibration data on the label.
Brooks Instrument at a glance
| Origin | Founded in 1946 by Stephen A. Brooks as the Brooks Rotameter Company, Lansdale, Pennsylvania |
|---|---|
| Headquarters | Hatfield, Pennsylvania, USA |
| Ownership | Emerson division until 31 December 2007, then American Industrial Partners; part of ITW since January 2012 |
| Product families | Thermal, pressure-based and Coriolis mass flow controllers and meters, metal tube and glass tube variable area flowmeters, pressure and vacuum products |
| Typical duty | Precise gas and liquid flow control in process, laboratory, analyser, fuel cell and semiconductor applications |
Brooks mass flow controllers and flowmeters
| Series | Type | Typical use |
|---|---|---|
| SLA5800, SLAMf | Thermal mass flow controllers and meters | Gas flow control in process and analytical systems; SLAMf with an IP66 enclosure for harsh or outdoor locations |
| 5800E | Analog thermal mass flow controller | Installed base in older systems; often replaced with the SLA5800 series |
| Quantim QMC | Coriolis mass flow controller | Low-flow liquid and gas control independent of fluid properties |
| GF40, GF80, GF100, GP200 | Metal-sealed thermal and pressure-based mass flow controllers | High-purity and semiconductor gas delivery; MultiFlo allows gas and range changes without recalibration |
| MT3750C, MT3809G | Metal tube variable area flowmeters | Purge, chemical injection and utility flows at higher pressure and temperature, with optional transmitter and alarms |
| GT1600, Sho-Rate 1250/1255 | Glass tube variable area flowmeters | Visual flow indication on purge, sample and laboratory lines |
Where Brooks instruments are used
Brooks mass flow controllers dose gases in analyser systems, catalyst and pilot plant testing, gas blending, burner and combustion control, fuel cell test stands and semiconductor tools. Variable area flowmeters are widely used on purge gas, seal flush, sample and chemical injection lines in oil and gas, refining and petrochemical plants, where a simple local indication without external power is preferred.
Ordering Brooks instruments: what we need
Send the full model code and serial number from the label. Mass flow controllers are calibrated for a specific gas and full-scale flow, so state the gas or gas mixture, flow range, inlet and outlet pressure, temperature, process connection, seal material, signal (analog, RS-485, DeviceNet, EtherNet/IP or other) and any hazardous-area requirement. For variable area meters add the fluid, density, viscosity, flow range, connection size, materials and whether alarms or a 4-20 mA output are needed.
Facts checked against Brooks Instrument company information and product data, October 2026.
Browse Brooks Instrument products by category: Flowmeters.
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Frequently Asked Questions
What is MultiFlo?
A Brooks technology that uses a database of gas runs to give gas-specific correction, allowing gas and range changes without removing the device.
What flow range does the GF040 cover?
3 sccm to 50 slm nitrogen equivalent.
Is a meter version available?
Yes. Valve configuration M gives a meter with no valve.
Which maximum pressure applies?
Maximum operating pressure is 150 psig (10 bar) according to the datasheet.
Which communications are offered?
RS485 in three protocols, Profibus, DeviceNet and EtherCAT, along with analog voltage and current signals.
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