Industrial Stainless Steel Thermal Mass Flow Switch for Water and Oil Adjustable

Product Description

Product Description

Working Principle & Structure
The thermal conductivity flow switch operates on the principle of heat transfer. It features two resistors within a sealed probe—one heated as a sensing resistor, and the other unheated as a reference resistor. When the medium flows, it carries away the heat from the sensing resistor, changing its resistance. The difference between the two resistors is used to determine the flow rate.
The probe is coated with an anti-scaling layer that effectively prevents scale, rust, and other pipeline contaminants from adhering, providing stronger anti-fouling capability and more stable performance.

Applications
This gas-liquid dual-purpose thermal flow switch is widely used in petrochemical, electric power, metallurgy, steel manufacturing, papermaking, food processing, water treatment, battery production, and more.
It is also suitable for pneumatic and hydraulic systems to monitor flow interruptions of circulating water, cutting fluid, and lubricating oil, and to provide dry-run protection for pumps.

Technical Specifications

Setting Range:

Water: 1–150 cm/s

Oil: 3–300 cm/s

Air: 20–2000 cm/s

Signal Output: Relay (default), PNP/NPN (customizable)

Power Supply: 24V DC ±20%

Startup Current:

PNP/NPN type: Max 400mA

Relay type: Max 1A (48VAC/DC)

No-load Current: Max 80mA

Flow Indicator: 6 LED lights

Setting Method: Potentiometer

Pressure Range: Up to 100 bar

Medium Temp. Change Rate: ≤4℃/s

Response Time: 1–13s (typical: 2s)

Initialization Time: Approx. 8s

Electrical Protection: Reverse polarity, short circuit, overload protection

Protection Level: IP67

Medium Temperature: -20 to 90℃ (optional high-temp version: -40 to 150℃)

Ambient Temperature: -20 to 80℃

Storage Temperature: -20 to 100℃

Wiring Interface: M12 connector

Material:

Probe: Stainless steel 304 or 316

Housing: Stainless steel 304

Repeat Accuracy: ±2%

FAQs

Q1: Is the thermal conductivity flow switch suitable for both gas and liquid media?
A1: Yes, this flow switch is designed for dual-use with gas and liquid. It performs reliably in air, water, oil, and other fluids, making it ideal for various industrial applications such as water treatment, pneumatic systems, and hydraulic monitoring.

Q2: How is the flow rate set and how can I check if the device is operating correctly?
A2: The flow rate is easily adjustable using a built-in potentiometer. The device includes 6 LED indicators to visually display the flow status, helping users confirm operational status in real time.

About Prime Living

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Shipping policy

We carefully handle each order to ensure your package arrives quickly and safely. Please note that factors such as weather, postal traffic, or carrier performance may occasionally cause delays beyond our control.

We provide free shipping and dispatch all orders within 2 business days of payment, often sooner. All shipments are sent via international express air shipping, with a tracking number provided so you can follow your order every step of the way.

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Returns

Your satisfaction is important to us. Hexlight offers a 14-day Free return policy: if you are not fully satisfied with your purchase, you may request either a full refund or an exchange. All return shipping costs are fully covered by us.

Condition

Brand New

Shipping

This item is shipped directly from our supplier in China with tracking.