Flow Switch Thermal Dispersion Type

Parameter Name

Value / Specification

Switching Range (Liquid)

0.01 to 3.0 m/s, accuracy ±5% FS

Switching Range (Gas)

0.5 to 30 m/s, accuracy ±10% FS

Repeatability

±1% to ±5% FS

Response Time

2 to 10 s

Max. Operating Pressure

100 bar (1450 PSI), with +0 / -5 bar tolerance

Process Temperature Range

-20°C to +80°C (up to +150°C optional)

Ambient Temperature Range

-20°C to +60°C

Medium Viscosity Range

Up to 200 cSt

Supply Voltage

24 VDC (18–36 VDC) or 230 VAC

Current Consumption

≤ 80 mA

Output Type

PNP / NPN / Relay (NO/NC selectable)

Relay Contact Rating

3 A at 250 VAC / 1 A at 30 VDC

Wetted Materials

Stainless Steel 316L (optional Titanium)

Housing Material

Stainless Steel 304 or Aluminum

Process Connection

G1/2" or 1/2" NPT male thread

Insertion Length

45 mm (customizable)

Enclosure Protection

IP67

Hazardous Area Rating

Ex d IIC T6 Gb / Ex ia IIC T4 Ga

Status Indicator

6-LED status indication (Red / Yellow / Green)

Application Field

Typical use

HVAC Systems

Detects reduced chilled water circulation below minimum flow threshold in HVAC piping.

Pump Protection

Detects loss of flow at pump inlet to prevent dry-run damage.

Industrial Cooling

Verifies continuous coolant flow in welding cooling circuits.

Chemical Processing

Monitors additive dosing flow continuity in chemical lines.

Water Treatment

Detects backwash flow presence in filtration systems.

Power Generation

Monitors lubrication oil flow condition in turbines.

Standard / Document

Compliance Framework & Scope

ISO 9001:2015

Audited factory workflows support consistent manufacturing protocols.

CE Mark

Electronic designs meet EU safety and environmental protection requirements.

RoHS Directive

Restricted hazardous substances in all components and solder joints.

ATEX / IECEx

Specific configurations fulfill hazardous industrial atmosphere safety requirements.

Calibration Certificate

Each shipped product includes a documented flow verification report.

EN 10204 3.1 Certificate

Metallic wetted components feature verified chemical composition analysis.

HNF10-AC Thermal Conductivity Flow Switch Parameters

Specific Parameters

Value / Description

Measurement Principle

The HNF10-AC thermal conductivity flow switch is designed based on the principle of heat exchange. The probe is equipped with an internal heating module and a heat sensing module. The heat conduction of the flow switch is closely related to the flow rate of the medium. During measurement, the heating module emits heat. If there is no medium flow in the pipeline, the amount of heat received by the heat sensing module is a fixed value. When there is medium flow, the amount of heat received by the heat sensing module will change with the flow rate of the medium. The heat sensing module converts this temperature difference signal into an electrical signal, which is then converted by the processor into a corresponding standard analog signal or contact signal output. The flow switch uses this signal to display and control the flow rate of the medium.

Set Range

1...150 cm/s (water), 3...300 cm/s (oil), 20...2000 cm/s (air)

Pressure Resistance Range

100bar

Medium Temperature Range

-20~90℃

Ambient Temperature Range

-20~80℃

Signal Output

PNP, NPN, Relay, selectable Normally Open + Normally Closed

Signal Input

3 wires 4~20mA current input, can be used as a data acquisition device
Connecting three-wire/four-wire PT100 platinum resistance for cold and heat measurement

Power

24V±20%DC

Turn On The Power

Max 400mA (PNP or NPN type)
Max 1A 48V AC/DC (Relay type)

Electrical Protection

Inversion, short circuit, overload protection

Shell Material

304 Stainless Steel

Probe Material

304 Stainless Steel

Protection Level

IP67

Weight

0.4kg

Certificate

CE

Ordering Information