Flow Control
SLSA5851S1MAB1C2A1
Brooks SLA5851S1MAB1C2A1 Digital Thermal Mass Flow Controller
About this part
The stored SLSA5851S1MAB1C2A1 record corresponds to a Brooks-labeled SLA5851S1MAB1C2A1 gas mass flow controller. This configured unit is calibrated for hydrogen at 100 SLPM and has RS485 communications, 4–20 mA analog setpoint and flow signals, a nominal 24 Vdc supply, 3/8–1/2-inch VCO connections, Viton seals, and a normally closed valve
Configurations vary. Verify the exact unit before choosing a replacement.
Key Facts
Specifications
| Manufacturer | Brooks Instrument |
| Manufacturer model code | SLA5851S1MAB1C2A1 |
| Product family | SLA5800 Series |
| Function | Digital thermal mass flow controller, body size 1 |
| Stored-identifier boundary | SLSA5851S1MAB1C2A1 contains an extra initial S; the Brooks manufacturer label reads SLA5851S1MAB1C2A1 |
| Calibration gas | Hydrogen (H2) |
| Full-scale flow | 100 SLPM |
| Calibration reference temperature | 70°F, marked STANDARD |
| Specified inlet pressure | 20 psig |
| Specified outlet pressure | 2 psig |
| Process/ambient temperature marking | 5°C to 65°C |
| Mechanical connection option | 3/8–1/2-inch VCO (code 1M) |
| O-ring material | Viton (code A) |
| Valve-seat material | Viton (code B) |
| Valve type | Normally closed (code 1) |
| Valve orifice marking | 0.0635 inch |
| Restrictor marking | G |
| Digital communications | RS485 Brooks S-Protocol (code S) |
| Analog setpoint input | 4–20 mA |
| Analog flow output | 4–20 mA |
| Primary connector | 15-pin male Sub-D |
| Power-supply option | 24 Vdc nominal (code 2) |
| Response option | Standard response (code A) |
| Certification option | Safe area (code 1) |
What Does SLSA5851S1MAB1C2A1 Mean?
The supplied record string contains an extra initial S. The physical manufacturer label and Brooks ordering structure establish the decodable code as SLA5851S1MAB1C2A1.
| Segment | Field | Interpretation |
|---|---|---|
| SLSA | Supplied record text | Not a documented Brooks ordering segment; the manufacturer label reads SLA |
| SLA | Base model | SLA elastomer-sealed digital mass-flow platform |
| 58 | Package / finish | Standard elastomer series |
| 5 | Function | Mass flow controller |
| 1 | Body size | Body size 1; use the unit label for its configured flow range |
| S | Digital I/O communications | RS485 with applicable analog I/O |
| 1M | Mechanical connection | 3/8–1/2-inch VCO |
| A | O-ring material | Viton |
| B | Valve-seat material | Viton |
| 1 | Valve type | Normally closed |
| C | Analog I/O | 4–20 mA input and 4–20 mA output through a 15-pin Sub-D connector |
| 2 | Power-supply input | 24 Vdc |
| A | Output enhancement | Standard response |
| 1 | Certification | Safe area |
Configured Electrical Interface
Relevant connections for the label-verified RS485, 4–20 mA configuration are listed below.
| Pin | Signal | Use |
|---|---|---|
| 1 | Setpoint common | Return for analog setpoint input |
| 3 | TTL alarm output | Open-collector alarm output |
| 4 | Flow signal output | Configured 4–20 mA flow output |
| 5 | Positive supply | Nominal 24 Vdc supply |
| 7 | Setpoint input | Configured 4–20 mA setpoint input |
| 9 | Power-supply common | Supply return |
| 10 | Flow-signal common | Analog flow-output return |
| 12 | Valve override | Forces the controller valve independently of setpoint |
| 14 | RS485 B (-) | Digital communications |
| 15 | RS485 A (+) | Digital communications |
Documentation Downloads
Local PDF copiesPart Photos
4 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 $100.00 to $100.00. Based on 1 archived listing record; not a current offer, appraisal, or confirmed sale price.
View archived listing titles
- Brooks Delta Smart II SLSA5851S1MAB1C2A1 Mass Flow Controller 100 SLPM (G4B*)