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Thermal Conductivity Flow Switch (explosion-proof )NK33EX

Brand：ZANKE
Model：NK-33EX
Description：Introduction 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 imme
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Introduction
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.

Anti-corrosion explosion-proof flow switch NK33EXF

Specification

Flow velocity: 1~150 cm/s (water), 3~300 cm/s(oil) or, water: 1~70 cm/s, oil: 2~100 cm/s
Warm-up time: 15 sec. (approximate)
Operation temperature:-4?F~176?F (-20?C~80?C)
Ambient temp: -4?F~176?F (-20?C~80?C)
Operation pressure: 100 bar
Housing rating: IP67
Enclosure material/rating: Aluminum / Ex d IICT6
Wetted materia: 304SS
Supply voltage: 24Vdc A 20%
Output: Open collector---NPN / PNP, 400 mA max. (with current limiting).