Product Description
1.NOTE
Model | Inner Diameter | Flow Range | Thread/Connector Size |
YF-S401 (2.0) | 2.0 mm | 0.5–3 L/min | 7 mm thread |
YF-S401 (3.5) | 3.5 mm | 0.5–5 L/min | 7 mm thread |
YF-S402 | 7.6 mm | 0.5–6 L/min | M11 × 1.25 thread |
YF-S402B | 6.5 mm | 0.3–6 L/min | 1/4" PE quick connector |
YF-S402C | 9.0 mm | 0.5–10 L/min | G3/8 thread |
YF-S403 | 13.0 mm | 1–30 L/min | G3/4 thread |
Precautions:
1. To prevent particles or debris from entering the sensor, a filter screen must be installed at the water inlet.
2. The flow sensor must be installed indoors or inside equipment. Avoid exposing it to outdoor environments, humidity, high temperature, or harsh conditions. Install the sensor away from
3.Avoid strong impacts and exposure to corrosive chemicals.
Do not drop or subject the sensor to collisions.
2. Parameters
Parameter | YF-S401 (2.0) | YF-S401 (3.5) |
Model | YF-S401 (2.0) | YF-S401 (3.5) |
Thread Size | 7 mm | 7 mm |
Voltage Range | DC 3.5–24V | DC 3.5–24V |
Inlet ID / OD | ID: 2.0 mm / OD: 7.2 mm | ID: 3.5 mm / OD: 7.2 mm |
Thread Length | 14 mm | 14 mm |
Body Material | POM (Polyoxymethylene) | POM (Polyoxymethylene) |
Flow Range | 0.5–3 L/min | 0.5–5 L/min |
Pulse Output Formula | f = 90 × Q (±2%) | f = 43 × Q (±2%) |
Pulses per Liter | ≈ 5400 pulses/L | ≈ 2580 pulses/L |
Pressure Resistance | ≤0.8 MPa | ≤0.8 MPa |
Output High Level | > DC4.7V (at DC5V input) | > DC4.7V (at DC5V input) |
Output Low Level | < DC0.5V (at DC5V input) | < DC0.5V (at DC5V input) |
Insulation Resistance | >100MΩ | >100MΩ |
Pulse Duty Cycle | 50% ±10% | 50% ±10% |
3. Features
Leak-proof and wear-resistant
Sealed housing design prevents leakage and ensures long service life.
High sensitivity and stable signal
Detects subtle flow changes with accurate and consistent pulse output.
Wide voltage compatibility (DC 3.5–24V)
Suitable for various industrial and consumer applications.
RoHS compliant and eco-friendly materials
Made from high-quality POM, meeting international safety standards.
4. Applications
Coffee machines
Water dispensers
Vending water machines
Water purification systems
Perfect for flow monitoring and control in small appliances and automated systems.
5. FAQs
Q1: Can it be used with hot water?
A1: It is recommended for cold or room-temperature water. Hot water may reduce the product’s lifespan.
Q2: How accurate is the flow measurement?
A2: The sensor offers ±2% accuracy, ensuring dependable performance in most applications.
Q3: Any precautions during installation?
A3: Avoid impact, chemical exposure, dropping, or physical collision to prevent sensor damage.
About Prime Living
Prime Living is a Canadian online store offering a carefully selected range of quality products for home, automotive, tools, outdoor living, electronics and more.
We are committed to fast order processing, secure packaging and reliable tracked shipping to provide an excellent shopping experience.
Shipping policy
We are always working hard to ensure your package arrives as soon as possible. Please understand that some factors like weather, high postal traffic, and the performance of shipping companies are outside of our control.
Returns
We offer a 14-Day Return Policy on items in which you are not completely satisfied with. You have the option of a full-refund or an exchange of the item.
Condition
Brand New
Shipping
This item is shipped directly from our supplier in China with tracking.