Difference between Hysteresis and Window Comparator switch output mode

The two basic operating modes for flow switch output are hysteresis mode and window comparator mode.

In hysteresis mode, the switch will turn on when the flow is greater than the set value, and will turn off when the flow falls below the set value by the amount of hysteresis or more. For example, if the set value is 100L/min and the hysteresis value is 10L/min, when the measurement falls below 90L/min, the switch will turn off. Hysteresis mode can be selected for applications that require only one set point such as to monitor the purge of air flow in ionizer to ensure the flow rate is above specific flow rate requirement.


In window comparator mode, the switch output will turn on or off depending on whether the flow is within the range of the 2 set values, which are the lower limit and upper limit. For example, if the 2 set values are 90L/min and 120L/min, switch will turn on when the measurement is within the range of 90 to 120L/min. Window comparator mode can be selected for applications that require lower and upper limit set points such as to monitor the air flow for spray painting to prevent uneven painting due to excessive or insufficient flow rate.







About SMC Pneumatics Middle East FZE

SMC Pneumatics Middle East FZE is the United Arab Emirates branch of SMC Corporation, the world’s largest pneumatic automation products manufacturer which was established in Japan and now has more than 50 years of experience. In 2014, SMC Pneumatics Middle East FZE is established affirming our leading role in pneumatics control equipment & devices as well bringing best services to customers.

While the branch mainly assembles knockdown cylinders, SMC United Arab Emirates also offers a wide range of high quality advanced industrial pneumatic system technology products to meet applications in a myriad of sectors and fields of the market such as semiconductor, automotive, medical, and petrochemical, just to name a few. Products offered here range from actuators like electric actuator, pneumatic actuator and etc, to valves like solenoid valve, pneumatic valve and 2 port valve; from thermo equipment like refrigerated thermo chiller and temperature control equipment, to a variety of electrostatic removal, air dryer and process gas equipment .

Striving to maintain high standards not only in products but also in customer service, SMC United Arab Emirates is equipped with a well-stocked warehouse ensures quick delivery, as well as maintaining high levels of technical services and solid communication network to consistently meet the needs and expectations of our customers.



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