5866RC1A1G4M2NA is a configured Brooks Instrument 5866RT-family pressure controller/flowmeter identifier observed in Sonisys auction records and external semiconductor surplus inventories. Official Brooks 5866RT documentation identifies the platform as a remote-transducer electronic pressure controller/flowmeter that controls upstream or downstream pressure while measuring mass flow through the control valve. Exact gas calibration, full-scale flow, valve behavior, seal package, fittings, pressure-transducer range, and customer part-number context must be verified from the physical label or build documentation because the official PDFs are family-level documents and do not name this complete configured code
Configurations vary. Verify the exact unit before choosing a replacement.
Maintains a desired upstream or downstream pressure by comparing a remote pressure-transducer signal to the setpoint and modulating the integral control valve
Flow-measurement function
Measures mass flow through the control valve and provides a 0-5 V signal proportional to mass flow
Mass-flow-controller mode
5866RT can also be configured as a mass flow controller for calibration or test purposes
Pressure
Control architecture
Remote pressure sensor input with adjustable integral PID control electronics and top-access tuning switches
Pressure-control range
100:1 when used with a remote transducer that has a 0-10 V output
Pressure response time
Less than 0.8 seconds typical for a 0-100% command step with less than 2% pressure overshoot; actual response depends on system design
Remote pressure sensor compatibility
Suitable for pressure sensors with 0-5 V or 0-10 V output signals
Flow
Family flow range
Brooks 5866RT data sheet lists configurable flow ranges from 0-3 sccm to 0-30,000 sccm nitrogen equivalent at SEMI standard reference conditions
Flow output signal
0-5 Vdc, 1 kOhm maximum load
Flow accuracy
+/-1.0% full scale including linearity at calibration conditions for 3-10,000 sccm nitrogen equivalent; +/-1.5% full scale for flow rates greater than 20 slpm
Flow repeatability
+/-0.25% of rate
Controls
Pressure setpoint signal
0-5 Vdc or 0-10 Vdc command, with 5 Vdc reference output available for setpoint generation
Valve override
Electrically activated valve override is part of the 5866RT control platform
Electrical
Electrical connector
15-pin D-connector, DA-15P
Power requirement, normally closed valve
3.5 W; +15 Vdc +/-5% at 35 mA and -15 Vdc +/-5% at 180 mA
Power requirement, normally open valve
10.5 W; +/-15 Vdc +/-5% at 350 mA
Ratings
Operating temperature range
32 to 150 degrees F (0 to 65 degrees C)
Pressure Equipment Directive context
Brooks data sheet lists PED 97/23/EC Sound Engineering Practice for the 5866RT platform
Materials
Wetted parts
Standard wetted parts are 316L and 316L VAR stainless steel
Valve seat options
Standard Viton fluoroelastomer or metal valve seat depending on configured model code
Seal options
External and internal seals can be fluoroelastomer or metal, with Buna-N, Teflon, or Kalrez options depending on configuration
Connections
Standard mechanical connections
1/8 in or 1/4 in stainless steel compression fittings on standard 5866RT configurations
Optional mechanical connections
1/4 in VCO or VCR options; 5866RT(M) metal-sealed configuration uses 1/4 in VCR
Installation
Mounting orientation
May be installed in any position
Filter recommendation
Brooks recommends an upstream in-line filter for elastomer 5866RT installations to help prevent foreign material from entering the meter
Applications
Application domain
Upstream or downstream gas pressure control with simultaneous flow measurement, including vacuum-chamber pressure regulation, inert-gas feed control, process-vessel pressure control, and flow-related calibration or test service
Observed configuration
Observed gas and flow context
External surplus inventory and auction evidence describe this configured identifier with helium service and 300 sccm flow context; verify against the physical label before using as a technical specification
Observed customer or secondary part context
One auction listing associates this exact configured identifier with P/N 22-045874-00; treat that value as observed listing context unless it matches the physical label and procurement record