Brooks Instrument Smart-Series Thermal Mass Flow Controller
About this part
5851S/BD1DA1BA0BA1B1 is a configured Brooks Instrument 5851S/BD Smart-Series thermal mass flow controller. Official Brooks 5800-S documentation identifies 5851S/BD as a mass flow controller base with 20 to 100 ln/min full-scale range context, and the configured suffix decodes to 3/8 inch tube compression fittings, Viton seal/seat material, normally closed valve, 4-20 mA input with 4-20 mA and 1-5 Vdc outputs, A0 communication selection, mating connector only, standard response, standard calibration, +24 Vdc power, and safe-area classification. Stored auction and surplus evidence for this exact identifier describes an air-calibrated 80 SLPM unit, which should be verified from the physical label or calibration record before use
Configurations vary. Verify the exact unit before choosing a replacement.
Application classIndustrial automation and process equipment
CategoryFlow Control
Specifications
Identification
Part identifier
5851S/BD1DA1BA0BA1B1
Official base model
Brooks 5851S/BD Smart-Series mass flow controller
Series family
5800-S Smart-Series digital mass flow meters and controllers
Flow
5851S/BD flow range context
20 to 100 ln/min full-scale range class referenced to normal conditions of 0 deg C and 1013.25 mbar; actual gas and calibrated full-scale value are configured per unit
Mechanical
Process connection code
1D: 3/8 inch tube compression fittings
Materials
Seal and valve-seat code
A: Viton
Controls
Valve code
1: normally closed valve for the 5850/5851 controller series
Smart-Series features
Digital communication can expose flow, setpoint, totalizer, ambient temperature, operating settings, calibration data, controller settings, PID settings, and diagnostics
Electrical
Input/output code
B: 4-20 mA setpoint input with 4-20 mA and 1-5 Vdc flow outputs, including RS-232 at 9600 baud
Interconnection cable code
B: mating connector only
Power supply code
B: +24 Vdc standard selection
Main connector context
Brooks 5800-S documentation identifies a 15-pin Sub-D connector for Smart TMF electrical interfacing
Communications
Communication code
A0: no separate communication option selected; Brooks notes communication remains possible through RS-232 at 9600 baud
Performance
Enhancement code
A: standard response, listed for 5850/5851 controller models as less than 1 second
Family accuracy context
+/-0.7% of rate and +/-0.2% full scale at calibration conditions; optional enhanced accuracy is listed separately by Brooks
Family repeatability
+/-0.25% of rate
Calibration
Calibration code
1: standard calibration included
Safety
Area classification code
1: safe area
Environmental
Family temperature context
Brooks 5800-S documentation lists ambient and process gas temperature from 0 deg C to 70 deg C; observed unit listing temperature wording is treated as listing context only
Configuration
Configured-unit rule
Gas calibration, full-scale setting, pressure conditions, and calibration paperwork remain unit-specific even when the Brooks model-code suffix identifies fittings, valve state, electrical interface, calibration option, power, and area classification
