Prism wash is only used if the process being measured tends to coat. The appropriate wash medium (usually steam / water) with an adequate pressure is attached to the fitting provided. The frequency, duration & hold time of the wash is programmed via the touch screen menu.
Our systems have “Smart wash” logic set by default which washes every 20 minutes only as long as necessary – usually 1 – 2 seconds. If needed, it can wash up to 30 seconds. If it detects it wasn’t successful, it automatically tries again. Some applications work best with a more consistent wash length in which case the typical length is between 2 to 10 seconds.