IDEX Troubleshooting Guide - Table of Contents



	Sample injection solutions for Rheodyne®



	How to Use This Guide This Troubleshooting Guide discusses Rheodyne Models 7125, 7126, 7725, 8125, 8126, 9725, and 9726. The Exploded View of Injectors shows the internal parts of a generic injector. Appendix A shows specific models. Inside Injectors High pressure switching and sealing takes place between a ceramic stator face assembly and a polymeric rotor seal. The rotor seal wears with use and usually is the only part that may need replacement. In normal use it will last many thousands of injections. Rheodyne RheBuild™ Kits are available for all injectors. Kits contain only genuine Rheodyne parts together with tools and instructions. Note! When you have a problem, do not assume that replacing the rotor seal will always be necessary. Find your problem in the Table of Contents to the left and proceed as instructed. The "comments" section on each page has useful supplemental information. ChromTrac and RheFlex Fittings, and Sample Loops Rheodyne established color-code standards for valve fittings as a convenient means to visually identify and trace tubing connections. The illustration below shows brightly colored ChromTRAC™ knobs. To order, contact an authorized Rheodyne Distributor.			Tips On Using Injectors Exploded View of Injectors Leaks Symptom 1: Leaks at needle port — only while loading Symptom 2: Leaks at needle port or vents — but stops Symptom 3: Leaks at port, vents, or stator — continuously Artifact Peaks Symptom 4: Carryover (miniature chromatogram) Symptom 5: Spurious (unknown) peaks Symptom 6: Distorted peaks: fronting, tailing, broad Non-Reproducible Results Symptom 7: All peaks have poor area precision Symptom 8: Some peaks have poor area precision Symptom 9: All peaks are small or absent Decreased System Pressure Symptom 10: Pressure falls in INJECT position, then returns Symptom 11: Pressure falls when injector is switched to either LOAD or INJECT, then stays low Blockage – High Back Pressure Symptom 12: Cannot load loop Symptom 13: High system pressure Noise or Drift Symptom 14: Noisy or drifting baseline Appendices Appendix A: Injector Drawings withPart Numbers Appendix B: Adjusting the Pressure Setting of Injectors Appendix C: Non-injector Sources of Artifact Peaks Appendix D: Oxygen Peak Artifacts Appendix E: Flushing Procedures Appendix F: What Happens Inside the Injector Next Page \| Close Window