287MQ Marine Barograph With Quartz Clockwork

Aneroid barograph for registration of atmospheric air pressure with vibration dampened measuring unit for use at sea. Measuring range 955 to 1055 hPa Accuracy ± 0.7 hPa Diagram division 1 hPa. The measuring element of the barograph is a 7-piece set of diaphragm cartridges, made of a copper-beryllium alloy, which has proven itself for the pressure measurement due to its excellent elastic nature. Aging, hysteresis and elastic aftertreatment practically do not occur. The temperature influence on the kit and the transmission system is compensated by a bimetal over the entire measuring range and in a temperature range of -30 to +40 ° C. All axes of the fine-mechanical measuring mechanism are mounted in stone, whereby the instrument has only a minimum resting friction. The parts of the measuring mechanism are made of polished brass. Mahogany colored real wood case 345 x 170 x 180 mm. Quartz movement with daily, weekly and monthly circulation. The orbital times are 25.6h / 176h / 783h. Included in delivery are 60 diagram sheets weekly circulation and 2 fiber writing tips.