Abstract: The device allows microsamples to be introduced into the ionization source of the spectrometer. It includes a reactor with means for introducing the microsample, means for heating the microsample, means for connection with a vacuum source and means for feeding an adjustable flow of reagent for transforming the microsample into gaseous compounds; a restricted and calibrated passage for flow of the gases from the reactor; and a sublimation tube connected on the one hand to the passage and, on the other, to the ion source of the spectrometer through a valve having means for bringing it to an adjustable cryogenic temperature.

Abstract: A method for transmitting a message by a two way wire connection between a central control and survey station (1) and several remote detection stations (3A-3N) adapted to generate a signal representative of at least one parameter of its environment, particularly for the monitoring of buildings, during which the central station (1) successively generates addresses assigned to each of the remote stations (3A-3N), these latter in response to the reception of this address emitting a message characteristic of the value of the corresponding environment parameter, characterized in that said addresses are generated by the central station (1) by modulation of a continuous voltage permanently applied to said telegraphic connection, and in that each remote station (3A-3N) transmits its message by amplitude modulation of the current on said line by application of said voltage to said line.

Abstract: The invention relates to an ion current measuring device.This device comprises a vacuum chamber, a diaphragm for introducing an ion beam into the chamber, means for collecting the ions from the diaphragm and located at the end of the chamber opposite to the diaphragm, and means for measuring a periodic voltage between the collecting means and the reference earth. It is characterized in that it also comprises means located between the diaphragm and the collecting means, for bringing about a periodic modulation of the intensity of the ion current circulating between the collecting means and a reference earth, the measuring means being current or frequency measuring means.Application to the measurement of ion currents, particularly in mass spectrometry.