Which type of portable foam proportioner is considered basic?

The in-line eductor is considered the basic type of portable foam proportioner due to its straightforward design and operation. It uses a Venturi effect to draw foam concentrate into the water stream, effectively mixing the foam and water as they flow through the device. This simplicity makes it easy to use in various fire suppression scenarios, especially for initial attack operations.

In-line eductors are typically affordable and easy to maintain, which is important for fire departments that may operate with limited budgets or resources. The capacity for on-the-spot deployment in emergencies further enhances their utility in firefighting situations. The design also allows them to be connected directly to a hoseline, facilitating quick and effective foam application.

On the other hand, a hydraulic proportionaler involves more complex components and requires greater understanding of hydraulic systems to operate effectively. Balanced pressure proportioners are designed for larger operations involving high volume and specialized applications, thus may not be classified as basic. Class A foam applicators, while used for applying foam, include specific design features tailored to certain foam types, making them more specialized and not as straightforward as in-line eductors.