JPH10325833A - Gas chromatograph apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable aging without requiring a thermostatic bath, by heating and aging under a condition of a constant temperature with a carrier gas circulated in a column, heating and purging a specific component adsorbed by the column under a different temperature condition. SOLUTION: An adsorbent adsorbing a specific component is filled in a metallic column 1. Both ends of the column are connected to a passage-switching device. A temperature detection means 2 is set on the metallic column 1. The metallic column 1 is turned conductive and heated at a predetermined temperature condition by a temperature regulator 3. A controller 32 receives a temperature detection signal from the temperature detection means 2 and, heats and adjusts in temperature the metallic column 1 in accordance with a preliminarily set temperature adjustment control program. The temperature adjustment control program includes both programs for aging and purging. The metallic column 1 is accordingly heated, e.g. at about 200-250 deg.C for about 4-5 hours and at about 200-300 deg.C for about 0.1 hour by the respective programs. The aging can be executed upon necessities without a thermostatic bath for the aging.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a gas chromatograph used, for example, in an apparatus for measuring the concentration of components in the atmosphere.

[0002]

The aging of a column or a concentration tube in a gas chromatograph apparatus is performed by setting a column or a concentration tube in a constant temperature bath (oven) and flowing a carrier gas under a predetermined temperature condition. (Eg 2
(At 50 ° C. for about several hours).

[0003] However, in such a method, a thermostat dedicated to aging is separately required, and a place for installing the thermostat is also required. Further, in the heating for the aging, the entire thermostat must be heated. However, there is a drawback that the power consumption increases.

[0004] The present invention has been made in view of such circumstances,
It is another object of the present invention to provide a gas chromatograph device that can be aged without requiring a thermostat separately.

[0005]

According to the present invention, means for solving the above-mentioned problems are constituted as follows. That is, a metal column or a metal concentration tube, a temperature detection means for detecting the temperature of the column or the concentration tube, and a temperature detection signal from the temperature detection means, and a direct current is supplied to the column or the concentration tube. A temperature controller for heating and controlling the temperature, heating for performing aging under a predetermined temperature condition while flowing a carrier gas through the column or the concentration tube, and adsorbing in the column or the concentration tube. And heating for purging the specific component under a different temperature condition.

[0006] The temperature controller can heat the column or the concentrating tube under the temperature conditions required for aging without requiring a thermostatic bath, and adsorbed in the column or the condensing tube under another temperature condition. Heating for purging specific components can also be performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the gas chromatograph of the present invention will be described below in detail with reference to the drawings.
FIG. 1 shows a configuration of a heating device, and reference numeral 1 denotes a metal column (hereinafter, referred to as a column) made of, for example, stainless steel.
For example, the inside thereof is filled or coated with an adsorbent for adsorbing a specific component, and both ends thereof are connected to a flow path switching device such as a ten-way valve (not shown). Numeral 2 is a temperature measuring means comprising a thermocouple or the like attached to the column 1, 3 is a temperature controller for supplying electricity to the column 1 and heating the column 1 to a predetermined temperature condition, and 4, 5 are temperature controllers. 3 is a connection terminal for applying a current sent from 3 to the column 1. The present invention can be applied to a gas chromatograph device in which the temperature of a column (or a concentration tube) is lowered to adsorb a specific component without filling with an adsorbent.

The temperature controller 3 includes a controller (CTR) 31 composed of a microcomputer and a power supply circuit 3.
2, the CTR 31 receives the temperature detection signal from the temperature detecting means 2, and according to a preset temperature control control program,
A control signal for controlling the heating temperature of the column 1 under a predetermined temperature condition is sent to the power supply circuit 32, and the power supply circuit 32
Receiving the control signal from 31, the current is variably adjusted and sent to the column 1, and the heating temperature of the column 1 is adjusted so as to satisfy a predetermined temperature condition. The current applied to the column 1 may be either AC or DC.

The temperature control program includes an aging program and a purging program, and controls the temperature of the column 1 under different temperature conditions. In the aging, the heating temperature is controlled at, for example, 200 to 250 ° C. for about 4 to 5 hours while the carrier gas is passed through the column 1. In the purging of a specific component after the flowing of the sample gas, for example, 200 to 250 ° C. It is programmed to perform heating temperature control at 300 ° C. for about 0.1 hour.

As described above, the temperature controller 3 can perform the temperature control for aging in addition to the temperature control for the original purging.
Aging can be performed at any time as needed without requiring a separate thermostat for aging. In addition, in the aging, since the column 1 is heated by energizing, the power consumption is small and there is an energy saving effect.
Needless to say, the present invention can be applied to a concentration tube (not shown) instead of the column 1.

[0011]

As described above, according to the gas chromatograph apparatus of the present invention, the temperature controller controls the heating temperature for performing aging by directly applying an electric current to the column or the concentration tube, and the specific component. Is configured to perform a heating temperature control for purging aging, so that aging can be performed without the need of a separate thermostatic bath, power for the aging can be reduced, and an energy saving effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a gas chromatograph device of the present invention.

[Explanation of Symbols] 1 ... column (or concentrating tube), 2 ... temperature measuring means, 3 ... temperature controller.

Claims (1)

[Claims] 1. A metal column or a metal concentration tube,
A temperature detecting means for detecting the temperature of the column or the concentration tube, and a temperature controller for receiving a temperature detection signal from the temperature detection means and directly energizing the column or the concentration tube to heat and control the temperature. Heating for performing aging under a predetermined temperature condition while flowing a carrier gas through the column or the concentration tube, and purging a specific component adsorbed in the column or the concentration tube under another temperature condition. And a gas chromatograph device configured to perform heating of the gas chromatograph.