What to do if MKS Mass-Flo 2179A 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 2179A 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 Mass-Flo 2179A 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 Mass-Flo 2179A 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 2179A 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.
General| Operating Pressure | Up to 150 PSIG (10.3 barg) |
|---|---|
| Operating Temperature | 50 °C |
| Output Signal | 0-5 VDC |
| Process Connection | 1/4" |
| Wetted Materials | 316L stainless steel |
| Electrical Connections | 9-Pin D-Sub Connector |
| Weight | 1.1 kg (2.4 lbs) |
| Repeatability | ±0.25% of Full Scale |
Prohibits unauthorized parts replacement or modifications to the instrument.
States that component replacement and internal adjustments must be done by qualified personnel.
Advises caution when using hazardous materials and ensuring compatibility.
Instructs to purge the unit with clean, dry gas after installation or before removal.
Warns against operating the instrument in explosive environments unless certified.
Advises operating the unit within its rated maximum pressure limits.
Details the advanced flow sensor, control valve, and optimized bypass of the 1179 flow controller.
Describes the Type 2179's positive shutoff valve and its specifications.
Details electrical connection options for the 1179 flow controller.
Explains the Gas Correction Factor (GCF) and its use in flow rate calculations.
Provides the equation for calculating Gas Correction Factor for pure gases.
Details the equation for calculating GCF for gas mixtures.
Guides the user through the initial startup procedure for the MFC/MFM.
Explains the procedure for setting the zero point of the flow controller.
Instructs on adjusting controller gain to reduce signal oscillation.
Explains how to use the valve override feature to open or close the valve.
Advises checking and resetting the zero setting periodically for accuracy.
Presents a chart of symptoms, possible causes, and remedies for troubleshooting.
Details the procedure for adjusting the valve preload for MFCs.
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