NPT external mount flow switches

Model Number: GK-009 Brand Name: GENPHOAL Key Specifications/Special Features: Physical arrangement and styleThe choice of styles that may be suitable for an application will depend on the physical arrangement of the tank, the available mounting positions and whether access is available to the inside of the tank. The main styles are horizontal/side mounting and vertical mounting. The horizontal/side mounting type normally has a fixed housing, which passes through the sidewall of a tank, with a hinged float attached to the fixed housing. Vertical mounting types normally have a fixed vertical stem, which is installed through the top or bottom of a tank, along which slides a cylindrical float.Another important consideration is whether a build up of deposits from the liquid on the float body is likely to occur. These deposits can, over a period of time, accumulate to such an extent that the float switch can fail to operate. Whilst particular types of float switch have been developed to limit the effects of this build up, the experience and knowledge of the switch manufacturer is also critical here.Material selectionNylon:suitable for many oils, diesel, organic chemicals and MEK-based printing inks.Polypropylene (PP):suitable for many acids and alkali, detergents, inorganic and organic chemicals, oils and water.

Polyphenylene sulphide (PPS):suitable for many of the more aggressive chemicals and higher process temperatures, up to 120C.

Buna/Nitrophyl:suitable for many oils, diesel, petrol and water (non-potable applications).

D300 foam (PVC):suitable for most hydraulic oils and many chemical solutions.

Stainless steel:suitable for most medical and food applications, chemicals, hydraulic fluids, fuel oils and applications with process temperatures up to 135C.

Electrical
It is important to fully understand the nature of the load that needs to be switched and to ensure that the float switch is capable of handling this load. The electrical ratings, which most manufacturers provide in their float switch specifications, are for purely resistive loads. Any loads that have either inductive or capacitive components should have the appropriate contact protection measure applied.
Cables
In applications where aggressive liquids may spill onto external wiring, it is important to specify particular materials for the cables used to connect to the float switches. There are standard, UL-approved cable types for the various float switches, as well as high
temperature, low smoke zero halogen (LSZH) and other specialized materials.
Custom engineered float switches
The operating environment is critical to the choice of float switch. A water tank for an industrial process may only require a simple plastic float switch.