Flow Control
BC1CA1HC3BA1B1
Brooks 5850S/ Smart Mass Flow Controller
About this part
BC1CA1HC3BA1B1 identifies a Brooks Instrument 5850S/BC Smart-Series digital thermal mass flow controller configuration. The manufacturer code structure specifies 1/8-inch tube-compression fittings, Viton O-rings and valve seat, a normally closed valve, digital-command input with digital plus 1–5 Vdc flow output, RS-485 communication at 9600 baud, 24 Vdc power, standard response and calibration, and safe-area classification. Process gas and exact full-scale flow are calibration data rather than suffix-coded options
Configurations vary. Verify the exact unit before choosing a replacement.
No archived photo available
Key Facts
Specifications
| Manufacturer | Brooks Instrument |
| Configured model form | 5850S/BC1CA1HC3BA1B1 |
| Base model | 5850S/BC Smart Mass Flow Controller |
| Measuring principle | Thermal mass-flow sensing with integral control valve |
| Mechanical connection | 1/8-inch tube-compression fittings (code 1C) |
| O-ring and valve-seat material | Viton fluoroelastomer (code A) |
| Valve type | Normally closed (code 1) |
| Electrical input/output | Digital-communication input; digital communication plus 1–5 Vdc flow output (code H) |
| Serial communication | RS-485 at 9600 baud (code C3) |
| Electrical connector | 15-pin Sub-D |
| Cable provision | Mating connector only; no interconnection cable (code B) |
| Response option | Standard response; published 5850S controller settling time is 1 second (code A) |
| Calibration option | Standard calibration included (code 1) |
| Power-supply option | +24 Vdc (code B) |
| Area classification | Safe area (code 1) |
| Full-scale range band | 0.008–30 ln/min; this band does not establish the configured unit's exact full-scale value |
| Flow accuracy | ±0.7% of rate and ±0.2% of full scale at calibration conditions |
| Repeatability | ±0.25% of rate |
| Rangeability | 50:1 within specified accuracy |
| Controllability | 100:1 total operating range |
| Ambient and process-gas temperature | 0–70 °C |
| External leak integrity | 1 × 10^-9 mbar·L/s helium |
| Warm-up | Less than 10 minutes for 1% FS accuracy; 45 minutes for performance within specifications |
| Power consumption at 24 Vdc | 140 mA for a mass flow controller; up to 370 mA with valve override activated |
What Does BC1CA1HC3BA1B1 Mean?
The identifier follows the configuration portion of the Brooks 5850S model-code structure. Gas and exact calibrated full-scale flow are not represented in these segments.
| Segment | Field | Interpretation |
|---|---|---|
| BC | Base model range code | Used with 5850S/ to designate a mass flow controller in the 0.008–30 ln/min full-scale range band. |
| 1C | Mechanical connection | 1/8-inch tube-compression fittings. |
| A | O-ring/valve-seat material | Viton. |
| 1 | Valve type | Normally closed valve for the 5850/5851 series. |
| H | Electrical input/output | Digital-communication input with digital communication plus 1–5 Vdc output. |
| C3 | Communication/baud rate | RS-485 at 9600 baud. |
| B | Interconnection cable | Mating connector only. |
| A | Enhancement | Standard response. |
| 1 | Calibration | Standard calibration included. |
| B | Power supply | 24 Vdc. |
| 1 | Area classification | Safe area. |
Configuration Boundary
The model code establishes the hardware and interface options, but not the process gas or exact calibrated flow span.
Installation and Safety Notes
Applicable Brooks 5800S operating guidance.
- The integral precision control valve is not a positive shutoff device; install a separate downstream shutoff valve when positive isolation is required.
- The configured normally closed valve closes fully if power is interrupted.
- Use clean gas and maintain the inlet filter to protect the sensor and control valve.
- Check plumbing for leaks and purge with nitrogen before and after service involving reactive gases.
- Remove process-line pressure before servicing the instrument.
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 $300.00 to $300.00. Based on 1 archived listing record; not a current offer, appraisal, or confirmed sale price.
View archived listing titles
- Brooks Argon Mass Flow Controller 0.5 SLPM Model BC1CA1HC3BA1B1