Electronic Flow Switch NK300

The working principle of electronic thermal mass flow switch is based on thermal theory, and there are two resistors inside the closed probe. One resistor is heated and used as the measured resistor, while the other resistor is heated and used as the standard resistor.

When the medium flows, the heat on the heating resistor will be carried away, and the resistance value will change. Differential resistance is the basis for determining flow rate.

Application Program

• Gaseous/Liquid
• Cooling and lubrication system control
• Cooling circuit monitoring
• Control of filter unit
• Water pump dry operation protection device.
  Ground source heat pump flow switches are mainly suitable for industrial automation/mechanical equipment/air compression industry/refrigeration and air conditioning industry. Due to the fact that magnets do not come into contact with flowing water, they can usually work in sewage discharge systems.

Feature

• Reliable flow monitoring of liquid media
• Switches and analog outputs for flow, temperature, and diagnostics
• Parameters can be easily set through the local monitor.
• No wear and tear, no moving parts in the medium

Technical Specifications

• Setting range: 1… 150 cm/s (water), 3… 300 cm/s (oil), 20… 2000 cm/s (air)
• Signal output: PNP, NPN, relay, normally open+normally closed (SPDT)
• Power supply: 24V ± 20% VDC or 230V ± 15% VAC
• Current connection: maximum 400mA (PNP or NPN), maximum 4A (relay)
• No load current: maximum 80mA
• Flow indicator: LED light strip (6)
• Setting method: Potentiometer setting
• Pressure range: 100 bar
• Temperature gradient: ≤ 4 ° C/s
• Response time: 1-13 seconds, typical value 2 seconds
• Initialization time: 8 seconds
• Electrical protection: reverse connection, short circuit
• overload protection
• Protection level: IP67
• Medium temperature: -20… 80 ° C
• Environmental temperature: -20… 80 ° C
• Storage temperature: -20… 100 ° C
• Connection method: M12 plug/direct connection wire
• Material:Probe: Stainless steel      Shell: PBT      Weight: 0.4 kilograms

wiring diagram

Size Chart (millimeters)

Connect Attachments

Installation Instructions