CY-2A 15ppm Bilge Alarm, with Stable Performance, Query, Printing and Auto-Clean Functions, Upgraded One. CY-2A 15ppm bilge alarm is researched and manufactured by Jiujiang Zhongchuan Instrument Co., Ltd. (the former Jiujiang Instrument Factory) which is a upgraded-type instrument for monitoring micro-oil content in waste water. It's suitable for continuous monitoring of the oily water discharge ...