What to do if MKS Mass-Flo 179A show no output at zero?
If your MKS Measuring Instruments unit shows no output or overrange at zero after warming up, first check the cable type. If the cable is correct, ensure the valve override function is disconnected. If the issue persists, it may indicate an electronics malfunction, requiring the unit to be returned for service.
Why is my MKS Mass-Flo 179A Measuring Instruments oscillating?
If your MKS Measuring Instruments exhibit oscillation, it might be due to a controller gain setting that's too high. Try reducing the gain by turning it counter-clockwise. Also, verify that the upstream pressure regulator meets the manufacturer's specifications and that the upstream pressure isn't excessively high. If it is, reduce the upstream pressure.
What to do if MKS Measuring Instruments unit does not achieve full flow?
If your MKS Measuring Instruments unit does not achieve full flow, the upstream pressure might be too low. Try increasing the upstream pressure. Alternatively, excessive valve preload could be the cause.
Why does my MKS Measuring Instruments unit indicate a negative flow?
If your MKS Measuring Instruments unit indicates a negative flow, it is likely that the unit was installed backwards in the gas stream. Reinstall the unit in the proper flow direction.
What to do if MKS Mass-Flo 179A Measuring Instruments controller does not function?
If the controller of your MKS Measuring Instruments does not function, this could be due to an electronics malfunction, requiring the unit to be returned for service. Another possibility is a valve sticking.
Essential safety rules for operation, installation, and handling.
Details on MKS cables, connectors, and setup guidelines.
Overview of the 2179 MFC and details on electrical connections.
Explains GCF, its calculation for pure gases, mixtures, and temperature adjustments.
Procedures for starting up, zeroing, and adjusting the controller gain.
Provides a troubleshooting chart for symptoms, causes, and remedies.
Detailed steps for adjusting the valve preload for proper operation.
General| Operating Temperature | 0 to 50°C |
|---|---|
| Output Signal | 0-5 VDC, 4-20 mA |
| Gas Type | Various |
| Measurement Range | Ranges from 0-10 SCCM to 0-1000 SLPM, consult factory |
| Accuracy | +/- 1% of Full Scale |
| Operating Pressure | Up to 150 psig |
| Materials of Construction | 316L Stainless Steel, Viton |
| Electrical Connections | D-sub connector |
| Process Connections | 1/4 inch VCR or Swagelok |
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