Flow Control
QMBC4G1B3D1A2A1CH4C7A1BA
Brooks Instrument Quantim Coriolis Mass Flow Controller
About this part
QMBC4G1B3D1A2A1CH4C7A1BA is a Brooks Instrument Quantim QmB low-flow Coriolis mass flow controller configured for gas service. Its documented configuration includes a size-4 316L stainless-steel sensor tube, normally closed internal valve, IP66 hazardous-location enclosure, 1500 psi pressure rating, 1/4-inch tube-compression connections, HART over 4–20 mA I/O, Kalrez 4079 seals and a 10-micron inline filter
Configurations vary. Verify the exact unit before choosing a replacement.
No archived photo available
Key Facts
Specifications
| Manufacturer | Brooks Instrument |
| Product family | Quantim QmB Series |
| Configured model code | QMBC4G1B3D1A2A1CH4C7A1BA |
| Product type | QMBC Coriolis mass flow controller |
| Tube size | 4 |
| Primary fluid type | Gas |
| Pressure transducer | None |
| Control valve | Normally closed internal valve |
| Enclosure and area classification | NEMA 4X / IP66; Class I, Division 2 / Zone 2 |
| Surface finish | Standard, 32 Ra |
| Sensor tube material | 316L stainless steel |
| Maximum pressure rating | 100 bar / 1500 psi |
| Maximum temperature option | 65°C / 149°F rating |
| Process connections | 1/4-inch tube-compression fittings |
| Primary and secondary I/O | HART over 4–20 mA |
| Electrical connection | 1/2-inch FNPT conduit |
| Seals | Kalrez 4079 sensor, valve-stem and fitting seals; stainless-steel orifice seal |
| Valve seat | Metal, 17-7PH stainless steel |
| Special processing | None |
| Quality certifications option | None |
| Inline filter | 10-micron cartridge filter |
| OEM identification | Brooks |
| Tube-size nominal gas flow | 1.796 kg/hr; 24.79 slpm (24,787 sccm at 14.696 psia and 70°F standard conditions) |
| Gas flow accuracy | ±0.5% of rate under documented reference conditions, or the zero-stability-derived term, whichever is greater |
| Gas control differential pressure | 10–150 psi; actual maximum depends on process conditions and valve-orifice selection |
| Settling time | Less than 2 seconds to within 2% of final full-scale value for a controller with stainless-steel sensor |
| Supply voltage | +14 to +27 VDC |
| Controller current | 300–400 mA nominal; 715 mA maximum at 14 VDC |
| Maximum power | 10 W |
| 4–20 mA loop load | Less than 500 ohms series resistance |
| Current setpoint input | 4–20 mA; 250-ohm input impedance |
| Documented operating range | 0–60°C / 32–140°F |
What Does QMBC4G1B3D1A2A1CH4C7A1BA Mean?
The complete Brooks model code decodes into twenty documented configuration fields.
| Segment | Field | Interpretation |
|---|---|---|
| QMBC | Base model | Quantim flow controller |
| 4 | Tube size | Size 4; controller nominal gas flow 24.79 slpm and nominal liquid flow 7.97 kg/hr |
| G | Primary fluid type | Gas; changing fluid type requires re-zeroing and must remain within the valve specification |
| 1 | Pressure transducer | No transducer |
| B | Valve type | Normally closed internal valve |
| 3 | Accuracy | Standard 0.5% of rate for gas; optional 0.5% for liquid |
| D | Enclosure | NEMA 4X / IP66, Class I Division 2 / Zone 2 |
| 1 | Surface finish | Standard 32 Ra finish |
| A | Sensor tube | 316L stainless steel |
| 2 | Maximum pressure | 100 bar / 1500 psi |
| A | Maximum temperature | 65°C / 149°F rating |
| 1C | Process connections | 1/4-inch tube compression |
| H | Electrical I/O | HART over 4–20 mA for primary and secondary I/O |
| 4 | Electrical connection | 1/2-inch FNPT conduit |
| C | Seals | Kalrez 4079 sensor, valve-stem and fitting seals; stainless-steel orifice seal |
| 7 | Valve seat | 17-7PH stainless steel |
| A | Special processing | None |
| 1 | Quality certifications | None |
| B | Inline filter | 10-micron cartridge filter |
| A | OEM code | Brooks |
Compatibility and Upgrade Path
Brooks identifies the third-generation Quantim QMC platform as form-, fit- and function-compatible with earlier Quantim models and lists QMB-to-QMC as its upgrade path. This relationship does not define a one-for-one replacement ordering code for this configured unit.
Installation and Zeroing Notes
- Install the controller in the direction indicated by its engraved flow arrow.
- For horizontal gas service, mount the controller on top of the pipe to reduce the risk of trapped liquid; vertical gas flow may be upward or downward.
- Perform zeroing only after the instrument reaches process temperature and pressure, with the sensor filled and all flow stopped.
- The control valve is tuned for a particular pressure differential; operation away from calibration pressure conditions can destabilize control.
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 $450.00 to $450.00. Based on 1 archived listing record; not a current offer, appraisal, or confirmed sale price.
View archived listing titles
- BROOKS INSTRUMENT QUANTIM PRECISION MASS FLOW, MODEL: QMBC4G1B3D1A2A1CH4C7A1BA