Thermal dispersion flow switch is a precise flow sensing device, whose movement principle is heat diffusion. The probe consists of two temperature sensors. One sensor measures the temperature of the fluid when the probe is immersed. The other sensor is heated by a constant power. This creates a temperature difference between two sensors.
Temperature difference is an inverse ratio to the flow velocity. The probe and housing are made by stainless steel or engineering plastic.
This creates a temperature difference between two sensors. Temperature difference is an inverse ratio to the flow velocity. The probe and housing are made by stainless steel or engineering plastic.

NOIKE Thermal dispersion flow switch NK600 series

Since the device is without moving parts, therefore there is no wear and tear problem. and sensitivity individually. User can set the alarm and sensitivity easily.
Under normal operating conditions, no special maintenance is required. Contamination on the probe of NK600EX series could change its property. If necessary, using a suitable solvent to clean the surface of the probe periodically. After cleaning process, re-checking alarm setting and leakage of sealing ring is recommended.

1. Flow velocity: 1~150 cm/s (water), 3~300 cm/s(oil) or, water: 1~70 cm/s, oil: 2~100 cm/s

2. Warm-up time: 15 sec. (approximate)

3. Operation temperature:-4⁰F~176⁰F (-20⁰C~80⁰C)

4. Ambient temp: -4⁰F~176⁰F (-20⁰C~80⁰C)

5. Operation pressure: 100 bar

6. Housing rating: IP67

7. Enclosure material/rating: PUR material

8. Wetted materia: 304SS

9. Supply voltage: 24Vdc± 20% or 220VAC± 20%

10. Output: Open collector---NPN / PNP, 400 mA max. (with current limiting).

     Relay--- 1A/30Vdc, 0.3A/125Vac (NO or NC), 5A/250Vac max. (NO)