NOVELTY - The helium ionization detector (HID) has a chamber (1) e.g. monolithic block, including a set of openings for containing a pair of ionization electrodes (2), a helium gas inlet (3), a component detecting inlet (4), a gas outlet (5) and a collecting electrode (6). The openings are in fluid contact with each other by channels in the chamber. Each opening includes a conical section and a cylindrical section. One of the electrodes and the inlets are attached to the chamber with a temperature resistant adhesive. One of the electrodes is molten into the chamber.    USE - HID for a gas chromatographic apparatus (claimed) of an aerospace measuring device and an automatic measuring device in a robotic device for analysis of ambient air, natural gas and oil in a hazardous environment.    ADVANTAGE - The chamber is made of monolithic block, which does not contain any screw connections or other connections between different parts of the chamber that causes leakages immediately after assembling the chamber or after multiple cycles of utilization of the HID, thus avoiding the risk of the occurrence of leakages. The chamber includes an extra exhaust line for removing the exhaust gas, thus minimizing the risk of the occurrence of a jet stream, thus avoiding the need for any readjustment or maintenance during normal lifetime, and hence providing a reliable and highly sensitive HID that is not affected by a reduced signal-to-noise ratio arising from the presence of traces of the surrounding atmosphere. The length of the block is between 15 mm and 25 mm, width of the block ranges from 5 to 15 mm, and height of the block ranges from 2 to 7 mm, thus forming the HID in a compact manner.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for analyzing an eluted sample in a carrier gas with a HID.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of a HID enclosed within an encapsulating shell.    Chamber (1)    Ionization electrodes (2)    Helium gas inlet (3)    Component detecting inlet (4)    Gas outlet (5)    Collecting electrode (6)