Why is there a change in sensitivity in Thermo Scientific FOCUS GC?
The sensitivity of the Flame Ionization Detector depends on the carrier and detector gases flow rates and the detector temperature. An incorrect hydrogen flow rate reduces the FID sensitivity.
What to do if there is difficulty in igniting the flame in Thermo Scientific Measuring Instruments?
If you're having trouble igniting the flame, here are a few things to check: * Ensure all fuel gas flows are correct. * Check for a blocked jet by measuring the hydrogen flow with a flowmeter. If required, remove and clean the jet following the Clean/ Replace the FID Jet Operating Sequence. * Defective igniter: Check the igniter element. Refer to the Replace the FID Ignition Assembly Operating Sequence for instructions. * Broken or cracked flame jet: Replace jet. Refer to the Clean/Replace the FID Jet Operating Sequence for instructions.
General| Brand | Thermo Scientific |
|---|---|
| Model | FOCUS GC |
| Category | Measuring Instruments |
| Language | English |
Provides a general description of the manual's contents and structure.
Explains formatting like bold, italic, and monospace text for clarity.
Details symbols for caution, notes, warnings, and electrical hazards.
Explains symbols for DC, AC, and grounding terminals.
Describes symbols for insulation, warnings, hot surfaces, and push controls.
Lists the components of the FOCUS GC Document Set and their purpose.
Details the environmental conditions for instrument operation.
Summarizes key technical specifications like interfaces, power, dimensions, and mass.
Provides critical warnings about instrument usage and chemical handling.
Emphasizes reading safety sheets and obeying local regulations for gas usage.
Details precautions for using hydrogen as a carrier gas.
Explains hydrogen sensor function and importance for safety.
Provides instructions for cleaning the instrument's exterior and handling spills.
Provides a high-level overview of the FOCUS GC's four major components.
Offers a detailed description of the instrument's components and panels.
Describes the three main components of the user interface: display, LEDs, and keypad.
Explains the elements of the GC menu display and how to navigate them.
Details the meaning and function of each status LED on the GC.
Describes the function of each key on the FOCUS GC keypad.
Explains how to enter and modify parameter values using the keypad.
Outlines the main menu options and how to access submenus.
Details the specific menus for Oven, Inlet, Carrier, Detector, Signal, Autosampler, Sequence, and Others.
Guides the user through configuring the GC system and its various modules.
Lists common gases used and recommended carrier gases, including safety for hydrogen.
Explains the Digital Pressure and Flow Control (DPFC) module for carrier gas.
Details the conventional pneumatic regulators for detector gas control.
Provides an operating sequence for measuring detector gas flows using a bubble meter.
Explains carrier gas parameters and the available flow modes: Constant Flow and Constant Pressure.
Describes the features of the FOCUS GC column oven, including heating and cooling capabilities.
Highlights safety measures related to the column oven, including hot air discharge and hydrogen use.
Provides instructions for configuring the column oven parameters.
Details the parameters available for programming the oven temperature and ramps.
Introduces the S/SL injector, its optimization for split/splitless applications.
Discusses the types of septa and glass liners available for the S/SL injector.
Explains how to install packed columns in the S/SL injector using an adapter kit.
Describes split and splitless injection techniques, including refocusing and flooding.
Details the parameters adjustable in the INLET menu, varying by operating mode.
Introduces the PPKD injector, its features, and temperature control.
Discusses septa and liner options suitable for the PPKD injector.
Explains injection techniques and operating modes for the PPKD injector.
Details the parameters available in the INLET menu for PPKD, depending on the operating mode.
Introduces column positioning and types: capillary and wide-bore.
Covers using correct fittings, ferrules, and retaining nuts for column installation.
Describes metric and imperial packed columns, including correct fittings.
Guides on installing capillary and packed columns, connecting them to injectors and detectors.
Explains column evaluation, leak identification, removal, and performing leak checks.
Details the process for conditioning new columns to ensure optimal performance.
Explains the operating principle, components, and base body of the FID.
Details the fuel and make-up gases required for FID operation and their factory-set flow rates.
Provides step-by-step instructions for installing the FID detector.
Lists and explains the control parameters available in the DETECTOR menu for FID.
Explains parameters controlling the FID signal output, including range and autozero.
Explains the TCD's sensitivity, universal detection capability, and filament operation.
Lists gases used with TCD and their thermal conductivity values, with safety for hydrogen.
Describes Constant Temperature (CT), Constant Voltage (CV), and automatic switching to Constant Current modes.
Provides guidance on selecting optimal operating parameters for CT and CV modes based on concentration.
Details the control parameters available in the DETECTOR menu for TCD.
Explains parameters controlling the TCD signal output, including gain and polarity.
Introduces programming and controlling AS 2000 and AI 3000/AS 3000 autosamplers.
Guides on configuring the instrument based on the connected autosampler and accessing its menus.
Details the parameters available in the AS 2000 Autosampler menu.
Details the parameters available in the AI 3000/AS 3000 Autosampler menu.
Explains how to use internal standards or solvents with the autosampler.
Instructions for programming sample sequences to run samples automatically.
Step-by-step guide for initial instrument setup, including power, carrier gas, oven, injector, detector, and autosampler configuration.
Instructions on how to program and edit run time events for automated operations.
Explains how to remove programmed run time events.
Details how to manually open or close inlet and external valves.
Provides the procedure for starting up the instrument and performing a manual or autosampler injection.
Explains the different status messages displayed on the GC, such as Not Ready, Stand-By, Prep-Run, Ready to Inject, and Run.
Defines the scope of the SOP and lists preliminary operations required before checkout.
Lists the parts required for performing the FID-S/SL checkout procedure.
Details the step-by-step procedure for checking the FID detector with the S/SL injector.
Defines the scope of the SOP and lists preliminary operations for TCD checkout.
Lists the parts required for performing the TCD-S/SL checkout procedure.
Details the step-by-step procedure for checking the TCD detector with the S/SL injector.
Defines the scope of the SOP and lists preliminary operations for TCD-PPKD checkout.
Lists the parts required for performing the TCD-PPKD checkout procedure.
Details the step-by-step procedure for checking the TCD detector with the PPKD injector.
Provides information on instrument maintenance and shutdown procedures.
Covers periodic maintenance of the S/SL injector, including septum and liner replacement.
Details periodic maintenance for the PPKD injector, including septum and liner replacement.
Explains how to keep the FID detector clean and free of dust for optimal performance.
Addresses common FID issues like sensitivity changes, gases, and flame ignition problems.
Provides simple rules to prolong the TCD detector's lifetime by avoiding contamination and damage.
Helps diagnose and resolve common TCD issues such as sensitivity, baseline drift, and negative peaks.
Describes how to install or replace the sampling loop of an automatic valve.
Offers a systematic approach to identifying and solving analytical problems with the GC system.
Explains how instrument malfunctions are identified and lists common error messages and their causes.
Provides guidance on rectifying faults in chromatographic systems using a systematic procedure.
Introduces the FOCUS GC LAN version and its rear panel features.
Explains how to set the IP address, netmask, and communication port for LAN connectivity.
Details how to reset the IP address and communication port to default values using the reset button.
Describes the two types of network cables included for LAN connection.
Provides step-by-step instructions for setting up the FOCUS GC LAN connection to a PC.
Provides contact details for international sales and customer support offices.
A survey to gather feedback on the manual's quality and usefulness.
Contains an alphabetical list and descriptions of terms, abbreviations, and symbols used in the guide.
An alphabetical index of all topics covered in the manual with corresponding page numbers.
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