Piston-type flow switch NK800 series

Principle structure

The NK800 series mechanical flow switch features minimal pressure loss, excellent repeatability, and anti-pollution capability. The mechanical and electronic parts are completely isolated, making it suitable for economical applications with low flow rates. The piston stroke setting accuracy is three times higher than the original NK800, ensuring greater precision. It comes with a switch setting scale, eliminating the need for on-site setting. The LED displays the switch status, and dual switch output options are available. It is suitable for liquid or gas media. It can be installed inline, and the housing is optional.

Applicable Medium

Technical Specifications

• Setting range: see parameter table for details
• Accuracy: ±5% of full scale
• Lag: Depending on the switching point, the amount is small, 0.5L/Min
• Switch setting scale: It is calibrated when the medium is water, the temperature is 20°C, and it is installed horizontally.
• Installation location: Changes in medium and temperature may slightly affect the switch value
• Wiring method: M12 5-pin connector, Housmann connector (optional)
• LED display: DC-powered LED displays the switch status, while AC-powered LED does not display.
• Output: Reed switch, capacity 24VDC/250VAC, 100mA
• Pressure resistance: 50 bar (aluminum type), 100 bar (stainless steel type)
• The average pressure loss is 0.3 bar at 25L/min
• Medium temperature: maximum 90°C
• Protection level: IP65

Size chart

Parameter Table

The parameters within the brackets above are reset points, while those outside the brackets are action points; if there is a lower limit alarm (indicating that the monitored flow rate is too low), refer to the reset point parameters;
For the upper limit alarm (monitoring excessive flow), refer to the reset point parameter.
* The above parameters are obtained by testing with a 20°C water medium when the switch is installed vertically on a horizontal pipeline.