Description
MKS BY150 | Mass Flow Controller Spec Sheet
Product Introduction
When a semiconductor deposition chamber drifts off-recipe due to unstable reactant gas delivery, the resulting wafer batch loss can cost tens of thousands of dollars in ruined silicon. The MKS BY150 is not a standard commercial flow valve; it is a high-accuracy mass flow controller engineered to maintain strict gas dosing repeatability under fluctuating inlet pressures.
Integrated directly into the gas box manifold, the unit processes thermal differential signals across a precision sensor tube to modulate its internal control valve—keeping gas delivery within tight percentage tolerances of full scale. It demands clean, dry process gases and stable 15VDC power, but once calibrated into the system, it delivers the deterministic execution speed required for delicate thin-film processes.
Key Technical Specifications
| Parameter | Specification |
| Input Power | \pm 15VDC (+/- 5\%) |
| Control Signal Input | 0-5VDC analog / digital bus option |
| Valve Type | Normally closed proportional solenoid valve |
| Response Time | \le 2 seconds to within 99\% of final flow |
| Operating Temperature | 10^\circC to 50^\circC ambient |
| Maximum Pressure | Up to 150 psig body rating |
| Wetted Materials | 316 Stainless Steel with elastomer seals |
| Weight | Approximately 1.1 kg |
Application Scenarios & Pain Points
- Plasma Etching Chambers: Older flow controllers used to experience thermal drift during extended multi-hour runs, causing etch rate degradation. Swapping to the MKS BY150 stabilized gas delivery thanks to its temperature-compensated sensor circuitry.
- Chemical Vapor Deposition (CVD): Without rapid valve settling times, reactant gas mixing ratios would spike during gas-step transitions. This MKS BY150 module snaps to setpoint quickly, eliminating flow overshoot and boundary layer defects.
- Vacuum Furnace Backfilling: A manufacturing plant avoided a costly redesign of their gas distribution panel by dropping the MKS BY150 directly into an existing legacy mounting footprint.
QA & Live Testing SOP (Trust Signal)
Precision gas delivery hardware requires uncompromising verification before touching a process tool. Every incoming MKS BY150 goes through a rigorous multi-point check:
- Visual & Leak Testing: We inspect wetted stainless steel surfaces for particulate contamination and perform a helium mass spectrometer leak check on the valve body and seals.
- Powered Bench Verification: The unit is connected to a calibration test rig, supplied with nominal \pm 15VDC, and tested across multiple flow setpoints against a NIST-traceable standard.
- ESD & Cleanroom Packaging: Units are purged, capped with clean fittings, and sealed in antistatic barrier bags. When you unbox the , it is ready for immediate integration.
Field Engineer’s Pitfall Guide
- ❗ Gas Conversion Factor Traps: Never assume the MKS is calibrated for your specific process gas out of the box; flowing a gas with a different thermal capacity without scaling the conversion factor will yield severe flow errors.
- ❗ Moisture and Particulate Contamination: Failing to use point-of-use 0.003-micron gas filters upstream will quickly foul the tiny sensor capillary tube, permanently ruining the controller’s accuracy.
- ❗ Ground Loop Induced Jitter: Ensure the controller chassis is securely earth-grounded to the gas panel frame; floating grounds introduce electrical noise that causes the internal control valve to oscillate.
Intent-Driven FAQ
Can I use the MKS with corrosive process gases like chlorine?
It depends on the internal seal and wetted material configuration; verify your specific unit’s elastomer and valve trim specifications against chemical compatibility charts before installation.
Is this MKS unit brand new or refurbished?
This inventory consists of verified surplus—un-installed factory backup stock preserved in climate-controlled storage environments.
What kind of interface cable does this controller require?
Standard multi-pin D-sub connectors handle power input and analog flow command/feedback signals, matching standard industry gas box harnesses.
What warranty covers this surplus mass flow controller?
Every MKS includes a standard 1-year replacement warranty covering any functional performance defects under normal operating conditions.
Do I need specialized software to calibrate the flow setpoints?
Basic operation relies on standard analog 0-5VDC signals, though advanced tuning or digital configuration may require the manufacturer’s service utility interface.
