To Next PageTo Next PageWhy is my Celerity UNIT 1660 showing inaccurate flow (span shifts)?
Inaccurate flow (span shifts) in Celerity Measuring Instruments can be caused by temperature variations (both steady state and transient), fluctuations in inlet pressure (steady state and transient), or power supply problems and electrical interference.
Why Celerity Measuring Instruments has control problems (cannot reach setpoint, oscillation)?
Control problems such as failing to reach the setpoint or oscillation in Celerity Measuring Instruments may arise due to the differential pressure being outside the operating range, unstable inlet pressure, or cable losses causing excessive ground current.
General| Brand | Celerity |
|---|---|
| Model | UNIT 1660 |
| Category | Measuring Instruments |
| Language | English |
Details the Auto-Zero feature for detecting and re-zeroing offset.
Details procedures for purging lines with nitrogen or argon before installation.
Details connecting inlet/outlet fittings using two wrenches.
Discusses voltage requirements and pinouts for MFCs and Flow Meters.
Explains connecting Celerity power supplies and checking pin assignments.
Refers to Appendices 16.3 and 16.7 for Auto Zero Initialization.
Details proper valve sequencing for MFCs with/without Auto Shut-off.
Emphasizes leak testing connections with a helium leak detector.
Mentions two recommended purging processes for non-reactive and reactive gases.
Refers to Appendix 16.2 for zero check and remote readout adjustments.
Outlines applying 100% setpoint and verifying 5VDC output.
Details closing valve, removing command, and verifying response time.
Explains checking calibration using a reference and potential errors with surrogate gas.
Lists symptoms and causes related to environmental factors affecting MFC performance.
Provides a checklist for verifying voltage, grounding, setpoint, and output.
Details purging procedures before removing the MFC to minimize contamination.
Lists pinouts for MFC, MFM cardedge, and various D-connectors.
Explains MFC zero drift and the importance of setting zero correctly.
Provides a step-by-step procedure for zeroing the MFC.
Instructions for connecting inlet/outlet VCR fittings and tightening.
Details power supply connections for 9000 Series using Cardedge or D-connectors.
Advises contacting technical support before removing the MFC.
