Waters Xevo TQ-GC - User Manual

Questions and Answers

C
charles44Aug 14, 2025
How to troubleshoot 'No ion beam' on Waters Xevo TQ-GC?
- J
  Joshua MeyerAug 14, 2025
  If you are experiencing a 'No ion beam' issue with your Waters Laboratory Equipment, start by checking the cable connections to the inner source, especially if the emission and filament current readbacks are zero. If the problem persists, reinitialize the instrument via Tune window by clicking Acquire > Reinitialize. If reinitialization doesn't work, reboot the embedded PC (EPC) using the reset switch. Also, check the filament for damage using a digital voltmeter; a damaged filament should be replaced. Verify your tuning parameter settings and ensure you have sufficient reference gas. Finally, make sure the vacuum is operating correctly; if not, refer to the 'Poor source vacuum' troubleshooting steps.
K
Kevin PetersonAug 17, 2025
What to do if the ion beam is unstable or has low intensity on Waters Laboratory Equipment?
- J
  Jonathan AndersonAug 17, 2025
  To address 'Unstable or low-intensity ion beam' in Waters Laboratory Equipment, first, evaluate your GC setup, including column cutting and position, by checking the source pressure and peak separation quality. Inject OFN to see if the issue originates from the GC. Ensure that the GC parameter settings are appropriate and clean the injector line if you suspect adsorption or contamination. Verify and adjust the lens settings to ensure they affect the beam. If the filament is old, replace it. If a high repeller voltage (50 V) is needed to maintain sensitivity, clean the ion repeller and ionization chamber. Finally, ensure you have sufficient reference gas.
T
tcameronAug 20, 2025
How to improve poor sensitivity with EI source on Waters Xevo TQ-GC Laboratory Equipment?
- L
  Lori ReidAug 20, 2025
  If you're facing 'Poor sensitivity with EI source' on your Waters Laboratory Equipment, begin by replacing or repositioning the filament if it's inefficient or sagging. If a high repeller voltage (50 V) is needed to maintain sensitivity, clean the ion repeller and ionization chamber. Also, check the EI filament for yttrium oxide coating. If the coating has worn away, replace the filament with another EI filament to ensure optimal performance.
W
whitneygarciaAug 25, 2025
What causes poor sensitivity with CI source on Waters Laboratory Equipment?
- L
  Lisa SimpsonAug 25, 2025
  To troubleshoot 'Poor sensitivity with CI source' on Waters Laboratory Equipment, start by replacing or repositioning the filament if it is inefficient or sagging. If the entrance hole is partially blocked, clean the inner source. If EI filaments are fitted, replace them with the CI filament assembly, ensuring that the uncoated rhenium filament is fitted. If a high repeller voltage (50 V) is needed to maintain sensitivity, clean the ion repeller and ionization chamber. Finally, verify that CI gas is flowing from a cylinder that is turned on and not empty.
J
jfordAug 27, 2025
Why is the analyzer vacuum poor in my Waters Xevo TQ-GC Laboratory Equipment?
- Y
  yangdonaldAug 27, 2025
  If you encounter 'Poor analyzer vacuum' in your Waters Laboratory Equipment, start by gas-ballasting the rotary pump or changing the oil. Inspect the vacuum hose for cracks and replace it if necessary. Check the exhaust line for any restrictions and remove them. If the turbo pump speed is considerably less than 100% and doesn't seem likely to reach it, contact your Waters service representative.
K
Kyle GarciaAug 31, 2025
How to fix poor source vacuum on Waters Xevo TQ-GC Laboratory Equipment?
- S
  Stephanie KrauseAug 31, 2025
  To address 'Poor source vacuum' on Waters Laboratory Equipment, first, confirm that the inner source and the mounting flange assemblies are correctly fitted. If the reference gas vial is leaking, turn off the reference gas and replace the seal. If the heated transfer line is leaking into the source, tighten the heated transfer line nut or replace the ferrule.
L
Leslie HarrisSep 3, 2025
What causes the failure of rotary pump fuse in Waters Xevo TQ-GC?
- M
  Michelle WrightSep 3, 2025
  If the 'Rotary pump fuse' fails in your Waters Laboratory Equipment, verify that the mains supply voltage does not exceed the rating for the pump. If the rotary pump oil is very dirty, change it. If the rotary pump oil is too low, allow time for oil to drain back in before topping it up.
J
Janet SmithSep 6, 2025
How to troubleshoot poor resolution on Waters Laboratory Equipment?
- S
  Seth MurraySep 6, 2025
  To improve 'Poor resolution' on Waters Laboratory Equipment, vent the instrument and clean the outer source lens stack. If the peak resolution does not improve, contact Waters. Also, reduce the ion energy or adjust the source or repeller voltage if the ion energy is set too high, or the repeller is not optimized.
B
brownwilliamSep 10, 2025
What causes high noise levels in MRM analyses on Waters Xevo TQ-GC Laboratory Equipment?
- L
  Lisa RiveraSep 10, 2025
  To reduce 'High noise levels in MRM analyses' with Waters Laboratory Equipment, ensure that, when ion energies are fully negative, the valleys of the peak-to-peak noise just touch the baseline. If necessary, increase the Ion Counting Threshold. Also, inspect for dirty gas lines or contaminated samples, solvents, or GC or CI reagent gases.

Summary

Waters Xevo TQ-GC Overview

IntelliStart Technology

Monitors instrument performance and indicates readiness for use.

Waters Xevo TQ-GC Instrument

Provides an overview of the instrument's capabilities and components.

Software and Data System

Describes the MassLynx software and its operations for controlling the instrument.

Ionization Techniques

Explains Electron Ionization (EI) and Chemical Ionization (CI) methods.

Ionization Source

Details the components and assemblies of the ionization source.

Gas Requirements

Lists the requirements for various gases used with the instrument.

Preparing the Mass Spectrometer for Operation

Preparing to Start the Mass Spectrometer

Outlines steps to prepare the instrument for startup, including gas connections.

Starting the Mass Spectrometer

Describes the procedure for powering on the instrument and associated software.

Monitoring Mass Spectrometer LEDs

Explains the meaning of instrument status LEDs for operational monitoring.

Tuning and Calibration Information

Details the necessity and process of tuning and calibrating the instrument.

Changing the Mode of Operation

Changing Inner Source Assembly: EI to CI

Provides a step-by-step guide for switching ionization modes from EI to CI.

Changing Inner Source Assembly: CI to EI

Provides a step-by-step guide for switching ionization modes from CI to EI.

Maintenance Procedures

Maintenance Schedule

Lists periodic maintenance tasks and their recommended frequencies for optimal performance.

Safety and Handling

Outlines critical safety precautions and handling guidelines for maintenance tasks.

Removing and Refitting Source Components

Describes procedures for disassembling and reassembling the instrument's source components.

Cleaning Inner Source Components

Details the process for cleaning the ionization chamber and repeller.

Replacing Inner Source Assembly Filament

Explains how to replace a damaged or inefficient filament.

Cleaning Outer Source Assembly Lenses

Guides on cleaning the lenses within the outer source assembly.

Best Practices for Efficient Operation

GC Injector and Inlet Best Practices

Discusses common problems and best practices related to the GC injector and inlet.

Air Leaks

Addresses the causes and prevention of air leaks, and their impact on performance.

Contaminated Source Components

Identifies issues caused by contaminated source components and best practices to avoid them.

Troubleshooting the Xevo TQ-GC

System Troubleshooting

Provides general instructions and approaches for diagnosing system-level problems.

Component Hardware Troubleshooting

Offers guidance on resolving issues related to specific hardware components.

No Ion Beam

Identifies causes and corrective actions for the absence of an ion beam.

Unstable or Low-Intensity Ion Beam

Lists potential causes and solutions for an unstable or weak ion beam.

Safety Advisories

Warning Symbols

Explains various hazard warning symbols and their associated risks.

Bottles Prohibited Symbol

Alerts to risks of equipment damage from solvent spills and proper bottle placement.

Warnings for All Waters Instruments

General warnings regarding equipment modifications and user responsibilities.

Warnings for Fuse Replacement

Provides critical safety information for replacing instrument fuses.

External Connections

External Wiring and Vacuum Connections

Identifies rear-panel connectors for external wiring and vacuum systems.

Connecting the Rotary Backing Pump

Details the procedure for connecting the rotary backing pump to the instrument.

Connecting to the Workstation

Guides on connecting the instrument to a workstation, including network and power connections.

Waters Xevo TQ-GC Specifications

General

Brand	Waters
Model	Xevo TQ-GC
Category	Laboratory Equipment
Language	English

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