JP3129011U - Gas chromatograph - Google Patents

Abstract

The present invention provides a gas chromatograph with improved workability such as FID ignition check and nozzle dirt check.
A gas chromatograph is configured by installing a mirror 11 near an exhaust port 6a of a FID 10 and an adjusting mechanism 12 for adjusting the angle and position of the mirror 11. By configuring in this way, the operator does not need to prepare a hand mirror or the like for the ignition confirmation, and it is possible to check the presence or shape of the hydrogen flame by reflecting on the mirror 11 from the front position of the gas chromatograph. Improves.
[Selection] Figure 1

Description

  The present invention relates to a gas chromatograph equipped with a flame ionization detector (hereinafter referred to as FID).

  FID measures the ionic current generated by passing a sample gas through a flame in which hydrogen gas burns in the presence of auxiliary combustion air and ionizing the carbon atoms constituting the organic substance in the sample gas in the hydrogen flame. Therefore, it is widely used as a detector for gas chromatography.

The specific structure and operation of the FID are described in detail in Patent Document 1 as the prior art, but an outline will be described below.
FIG. 2 schematically shows a schematic configuration of a conventional FID.
In the figure, reference numeral 1 denotes a column of a gas chromatograph, 2 denotes a detector base, and the end of the column 1 is connected to a column connecting portion 3 below the column. The carrier gas containing the sample gas flowing out from the column 1 is mixed with the hydrogen gas (or a mixed gas of hydrogen and nitrogen) introduced from the hydrogen gas inlet 2a, moves up in the nozzle 4, and is put on the tip thereof. A hydrogen flame A is formed by burning at the tip of a metal nozzle tip 5. The air introduced from the auxiliary combustion gas inlet 2b helps this combustion. Since a high voltage is applied to the nozzle tip 5 by the high-voltage power source 7, a potential difference is generated between the nozzle tip 5 and the cylindrical collector electrode 8 provided above the hydrogen flame A, whereby ions generated in the hydrogen flame A are generated. Is collected by the collector electrode 8 to generate a current. This is amplified by the amplifier 9 to be an output signal of the FID 10.
The upper part of the FID 10 is covered with a housing 6, and an exhaust port 6a for discharging combustion exhaust gas is provided upward at the top thereof.

JP-A-7-103957

  Conventionally, when using the FID, the operator holds a mirror near the exhaust outlet of the FID and visually confirms that the water vapor generated by the combustion of hydrogen is condensed on the mirror surface. Was. In the absence of a mirror or the like, the FID exhaust port was looked into from the top and confirmed directly by visual inspection. In addition, if the nozzle is clogged with sample residue or the like and the shape of the hydrogen flame changes, noise will occur or the detection sensitivity will change and the measurement reproducibility will deteriorate. The nozzle was checked for dirt.

For this reason, it is necessary for the operator to prepare a hand mirror or the like, or to look into the FID, the height of the gas chromatograph apparatus is high, which is a painful work for a short person.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a gas chromatograph with improved workability such as FID ignition check and nozzle dirt check.

  In order to solve the above problems, the present invention configures a gas chromatograph by installing a mirror near the exhaust port of the FID and an adjusting mechanism for adjusting the angle and position of the mirror.

  Since the present invention is configured as described above, it is not necessary for the operator to prepare a hand mirror or the like when confirming the ignition. The shape can be confirmed, and the workability is improved.

The first feature of the gas chromatograph provided by the present invention is that a mirror is installed near the exhaust port of the FID, and the second feature is to have an adjusting mechanism for adjusting the angle and position of the mirror. This is the point that was configured.
Therefore, the basic configuration of the best mode is a gas chromatograph having the above two characteristic configurations.

  FIG. 1 shows an embodiment of the present invention. FIG. 2A shows the overall configuration of the gas chromatograph, and an enlarged view inside the broken circle is FIG. As shown in FIG. 2A, the FID 10 is provided on the upper part of the oven 20 of the gas chromatograph, and a part of the FID 10 protrudes from the upper surface 21 of the oven. The configuration of the FID 10 is the same as that in FIG. 2, and a mirror 11 is provided in the vicinity of the exhaust port 6a for discharging the combustion gas of hydrogen at the top. Reference numeral 12 denotes an adjustment mechanism that holds the mirror 11 and can freely adjust the position and angle of the mirror 11 by two joint portions 12a and 12b, and is fixed to the oven upper surface 21 of the gas chromatograph.

  In the present embodiment thus configured, the mirror 11 is brought close to the exhaust port 6a, and the operator performs an ignition operation. When ignited, dew condensation B occurs on the mirror surface and the mirror 11 becomes cloudy, so that ignition can be easily confirmed. Thereafter, the mirror surface continues to be exposed to a high-temperature exhaust flow, so that the temperature of the mirror 11 rises, and if necessary, the position of the mirror 11 is moved a little so that the condensation B on the mirror surface disappears. The operator can view the presence / absence and shape of the flame in the FID 10 by reflecting on the mirror 11 from the front position, and can immediately detect extinguishing, abnormal combustion, and the like.

Note that it is more effective to use a concave mirror as the mirror 11. By using the concave mirror, the operator can enlarge and observe the inside of the FID 10 and can easily check for clogged nozzles.
In addition, the mirror described above is not limited to a so-called glass mirror, and includes, for example, a metal member having a mirror-finished surface.

  The present invention can be used for gas chromatographs.

It is a figure which shows one Example of this invention. It is a figure which shows the structure of the conventional FID.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Column 2 Detector base 2a Hydrogen gas inlet 2b Auxiliary gas inlet 3 Column connection part 4 Nozzle 5 Nozzle tip 6 Housing 6a Exhaust outlet 7 High voltage power supply 8 Collector electrode 9 Amplifier 10 FID
11 Mirror 12 Adjustment mechanism 12a Joint part 12b Joint part 20 Oven 21 Upper surface of oven A Hydrogen flame B Condensation

Claims (2)

In a gas chromatograph equipped with a hydrogen flame ionization detector having an exhaust port for discharging the combustion exhaust gas of hydrogen flame above, an adjustment mechanism is provided for adjusting the position and angle of the mirror while installing a mirror close to the exhaust port. A gas chromatograph characterized by comprising. A gas chromatograph according to claim 1, wherein a concave mirror is used as the mirror.

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