Three alternative media can be used for prism wash:
- Steam
- Water
- High pressure water
The built-in relays of the indicating transmitter can be configured to control the prism wash cycle, see Configuring relays.
| CAUTION In food industry applications, wash media must be culinary steam or safe water. Shut-off valve and check valve must meet 3‑A sanitary standards. |
Culinary Steam: Steam produced using a system meeting criteria in the 3‑A Accepted Practices for a Method of Producing Steam of a Culinary Quality, Number 609.
Safe Water: Water from a supply properly located, protected, and operated, and of safe, sanitary quality. The water must meet the standards prescribed in the National Primary Drinking Water Regulation of the Environmental Protection Agency (EPA) as referenced in The Code of Federal Regulations (CFR), Title 40, Parts 141, 142, and 143.