Abstract: A pressure-sensor system having a sensor element and a hermetic housing for the sensor element has a particularly uncomplicated installation, in particular even under aggressive ambient conditions. The housing of this pressure-sensor system includes a first housing part having a housing bottom, and at least one additional housing part. The sensor element is installed on the housing bottom, and the pressure is supplied via an opening in the housing bottom. The at least one additional housing part is disposed above the sensor element and is connected to the first housing part. Apart from this, connecting pins for the electrical contacting of the sensor element are provided. The connecting pins are guided through the additional housing part.

Abstract: A pressure-sensor system having a sensor element and a hermetic housing for the sensor element has a particularly uncomplicated installation, in particular even under aggressive ambient conditions. The housing of this pressure-sensor system includes a first housing part having a housing bottom, and at least one additional housing part. The sensor element is installed on the housing bottom, and the pressure is supplied via an opening in the housing bottom. The at least one additional housing part is disposed above the sensor element and is connected to the first housing part. Apart from this, connecting pins for the electrical contacting of the sensor element are provided. The connecting pins are guided through the additional housing part.

Abstract: The invention relates to a method for protecting plants against stress or for increasing their yield, in which the plant is treated in its intense development stage or directly after flowering or before, during or maximum 5 days after the occurrence of stress with 0.001-10 kg/hectare of a compound of Formula (I), ##STR1## wherein X.sup.- is an agriculturally acceptable inorganic or organic anion. The invention also relates to a composition for protecting plants against stress or for increasing their yield, which comprises as active ingredient 0.001-95% by weight of a compound of formula (I).