FS-926 Series Flow Switch, 0-1.0 GPM Flow, 1/4" NPT Female Port Size
These switches provide accurate detection of excessive or insufficient flow rates in such applications as protecting against loss of fluid flow in hydraulic systems, assuring proper coolant flow in semiconductor processing equipment, monitoring high pressure lubrication systems, and ensuring proper air flow in water/waste systems.
The FS-926 Series, designed for liquids or gases, features a special low-flow piston. This additional piston allows the detection of fluid flow as low as 50 cc/min. These switches are ideal for applications such as gas sampling, liquid or gas leak detection, or chemical injection.
Double Piston Detects Minute Flow – FS-926
An additional, lap-fitted piston is used in Gems FS-926 Series to accurately detect low-flow rates. Calibration is determined by one or more metering holes at the end of the low- flow piston, which regulate bypass flow, and therefore the actuation setting.
When metered bypass flow is exceeded, the resultant pressure differential displaces the low-flow piston, moving the magnet carrier piston to actuate the reed switch. Two large bypass holes in the piston skirt are exposed after actuation to maintain low pressure drop.
Both the FS-925 and FS-926 use a spring-loaded piston to detect positive flow with great precision. They act upon the direct fluid flow and will not show “false- positive” flow indication as can happen with sensors using indirect sensing methods such as pressure measurement. The FS-926 incorporates an additional lap-fitted piston for very low flows.