Gas Chromatographs Specifications

Help with Gas Chromatographs specifications:

Instrument Type


	Instrument Type
	Your choices are...
	Portable Instrument		Has handles/case/wheels etc. to make easy to move, not necessarily held in hand to use.
	Fixtured or Permanent		Mounted or fixtured in place for long-running use.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

General Features and Functionality


	Programmable?		Detector has programming features.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Built in Chromatogram?		Detector has a built in recorder for chromatograph outputs.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Self-Calibration?		The chromatograph is capable of calibrating itself.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Extreme Environment?		The chromatograph is configured to operate in extreme environments, temperature, humidity, dust, etc.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Self-Test Diagnostics?		The chromatograph can perform self-test diagnostics to assess any errors.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Data Storage Options?		Integral or on-board storage capability.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Also Accepts Liquid Samples?		Gas chromatographs occasionally will have the functionality to accept liquid samples. In this case an instrument is needed to vaporize the sample before it is injected into the column.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

Environment


	Operating Temperature:		This is the full required range of ambient operating temperature.
	Search Logic:		User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.

Applications


	Applications
	Your choices are...
	Agricultural Chemicals / Pesticides		The gas chromatograph can be used for agricultural chemical / pesticide applications.
	Cosmetics / Fragrances		The gas chromatograph can be used for cosmetics / fragrances applications.
	Drugs / Pharmaceutical		The gas chromatograph can be used for drugs / pharmaceutical applications.
	Electronics / Plating		The gas chromatograph can be used for electronics / plating applications.
	Energy		The gas chromatograph can be used for energy applications.
	Environmental		The gas chromatograph can be used for environmental applications.
	Food / Beverage		The gas chromatograph can be used for food / beverage applications.
	Forensics / Narcotics		The gas chromatograph can be used for forensics / narcotics applications.
	Industrial Gases		The gas chromatograph can be used for industrial gas applications.
	Inorganic Chemicals		The gas chromatograph can be used for inorganic chemicals applications.
	Medical / Biological		The gas chromatograph can be used for medical / biological applications.
	Metals / Welding		The gas chromatograph can be used for metals / welding applications.
	Organic Chemicals		The gas chromatograph can be used for organic chemicals applications.
	Paint / Castings / Inks		The gas chromatograph can be used for paint / castings / inks applications.
	Paper / Pulp / Wood		The gas chromatograph can be used for paper / pulp / wood applications.
	Petroleum		The gas chromatograph can be used for petroleum applications.
	Plastics / Polymers / Rubber		The gas chromatograph can be used for plastics / polymers / rubber applications.
	Soaps / Cleaners		The gas chromatograph can be used for soaps / cleaner applications.
	Other		Other unlisted, specialized, or proprietary application.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

Oven Operation


	Column Oven?		Partitioning behavior is dependent on temperature, so the separation column is usually contained in a thermostat controlled oven.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Oven Operation Method:
	Your choices are...
	Isothermal Operation		Chromatograph is run at constant temperature.
	Temperature Programmable Operation		Linear increase of column temperature.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Oven Temperature Range:		Column temperature must be controlled within tenths of a degree. The optimum column temperature is dependent upon the boiling point of the sample. Generally: The higher the temperature the shorter the retention time.
	Search Logic:		User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.

Pump Specifications


	Flow Control?		Flow control is a very desirable feature.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Inlet Pressure Range:		The pressure range of the gas entering from the chromatographic column.
	Search Logic:		User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.

Injection Operation A sample is introduced into the heated injector, where it is vaporized and carried on to the column via a liquid or gas syringe, liquid or gas valve, concentrator, purge & trap, etc.


	Number of Injection Ports:		Number of ports that can be used to inject the sample gas.
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

	Injection Method:		For optimum column efficiency, the sample should not be too large, and should be introduced onto the column as a "plug" of vapor, slow injection of large samples causes band broadening and loss of resolution.
	Your choices are...
	Valve Injection		Injection via a valve.
	Syringe Injection		The most common type of injection
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Column Injection:		Commonly used carrier gases include: nitrogen, helium, argon, and carbon dioxide. The choice of carrier gas is often dependent upon the type of detector which is used.
	Your choices are...
	Split / Splitless Column Injection		This injector has another set of gas lines out, it is another path that the vaporized sample can take. This extra line is called the split line or vent. The amount of gas that exits the split line controls the amount of sample that enters the column.
	Packed Column Injection		All samples enter the column, including the gaseous sample, the solvent, and the analyte. May also be called a direct or flash injector.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

Detection Method


	Detection Method:
	Your choices are...
	Thermal Conductivity Detector		A TCD consists of an electrically heated wire or thermistor. The temperature of the sensing element depends on the thermal conductivity of the gas flowing around it. Changes in thermal conductivity, such as when organic molecules displace some of the carrier gas, cause a temperature to rise in the element which is sensed as a change in resistance.
	Flame Ionization Detector		An FID consists of a hydrogen/air flame and a collector plate. The effluent from the GC column passes through the flame, which breaks down organic molecules and produces ions. The ions are collected on a biased electrode and produce an electric signal.
	Atomic Emission Detector		The AED simultaneously determines the atomic emissions of many of the elements in analytes that elute from the GC capillary column. As the eluants come off the capillary column they are fed into a microwave powered plasma (or discharge) cavity where the components are destroyed and their atoms are excited by the energy of the plasma. The light that is emitted by the excited particles is separated into individual lines via a photodiode array.
	Electron Capture Detector		The ECD uses a radioactive Beta emitter (electrons) to ionize some of the carrier gas and produce a current between a biased pair of electrodes. When organic molecules contain electronegative functional groups, such as halogens, phosphorous, and nitro groups pass by the detector, they capture some of the electrons and reduce the current measured between the electrodes.
	Photo Ionization Detector		The PID uses ultraviolet light as a means of ionizing an analyte exiting from a GC column. The ions produced by this process are collected by electrodes. The current generated is therefore a measure of the analyte concentration.
	Flame Photometric Detector		This device uses the chemiluminescent reactions of phosphorous containing compounds in a hydrogen/air flame as a source of analytical information that is relatively specific for substances containing these atoms.
	Chemiluminescence Spectroscopy		Chemiluminescence uses quantitative measurements of the optical emission from excited chemical species to determine analyte concentration. Usually the emission is measured from energized molecules rather than excited atoms. The bands of light determined by this technique emanate from molecular emissions and are therefore broader and more complex than bands originating from atomic spectra.
	Nitrogen Phosphorous Detector		Compounds are burned in plasma surrounding a rubidium bead supplied with hydrogen and air. Nitrogen and phosphorous containing compounds produce ions that are attracted to the collector. The number of ions hitting the collector is measured and a signal is generated.
	Other		Argon discharge detector, discharge ionization detector, electrolytic conductivity detector, etc.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

User Interface Options


	Local Interface:
	Your choices are...
	Analog Front Panel		The panel has analog user inputs such as potentiometers, dials, switches, for adjustment of output, ranges, etc.
	Digital Front Panel		The panel uses digital keypads or menus for programming.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Computer Interface?		Can be controlled or monitored remotely with a computer via interface.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Computer Interface Options:
	Your choices are...
	Serial Interface		A port, or interface, that can be used for serial communication, in which only one bit is transferred at a time.
	Parallel Interface		A channel capable of transferring more than one bit at a simultaneously.
	Other		Modem, transmitter, TTL, etc.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Application Software Included?		For control or for monitoring chromatographic process.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

Display Options


	Display Options:
	Your choices are...
	Analog Meter		Data is displayed with an analog meter or simple visual indicator.
	Digital Readout		Device uses numerical or application specific display.
	Video Display		The data is presented in video form via CRT, LCD, or other multi-line forms.
	None		No integral display. Output is read and displayed remotely.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

Additional Output Options


	Additional Output Options:
	Your choices are...
	Analog Voltage		Any analog voltage output. Output voltage is a simple (usually linear) function of the measurement.
	Frequency / Modulated Frequency		Frequency or modulated frequency output (Ex. sine wave, pulse train, AM, FM).
	Analog Current		Often called a transmitter. A current is imposed on the output circuit proportional to the measurement. Feedback is used to provide the appropriate current regardless of line noise, impedance, etc. Useful when sending signals over long distances.
	Switch or Relay Contact		The output is a switch or alarm.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

Gas Chromatographs Specifications

Instrument Type:

Applications:

Column Oven?

Oven Operation Method:

Oven Temperature Range:

Flow Control?

Inlet Pressure Range:

Number of Injection Ports:

Injection Method:

Column Injection:

Detection Method:

Local Interface:

Computer Interface?

Computer Interface Options:

Application Software Included?

Display Options:

Additional Output Options:

Programmable?

Built in Chromatogram?

Self-Calibration?

Extreme Environment?

Self-Test Diagnostics?

Data Storage Options?

Also Accepts Liquid Samples?

Operating Temperature:

Help with Gas Chromatographs specifications: