Hope this post finds you well, we would like to purchase a capacitive piezo electric sensor, But first of all we have a problem with our design, our Piezo is surrounded by a closed case that seals electric part of sensor from water penetration, when there is a flush of water, sensor reacts properly but when water flush is discontinued sensor’s value doesn't change and it shows a constant value which is same as the situation that we had water flush.please guide me.thanks