Product Description
YF-S401 / YF-S402 Hall Effect PE Water Flow Sensor G1/2 G3/4 Inline Liquid Flow Meter 5V for RO Filter Coffee Machine
YF-S401 / YF-S402 Hall Effect PE Water Flow Sensor G1/2 G3/4 Inline Liquid Flow Meter 5V for RO Filter Coffee Machine1.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, ensure a filter screen is installed at the water inlet.
2.The flow sensor should be installed indoors or within equipment. Do not expose it to outdoor environments, excessive humidity, high temperatures, or other harsh conditions. Make sure it is positioned away from heat sources and areas with unstable conditions.
3.Protect the sensor from strong impacts and corrosive chemicals. Avoid dropping it or subjecting it to collisions to maintain reliable performance.
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
The sealed housing design prevents leakage and provides long-lasting durability.
High sensitivity and stable performance
Accurately detects subtle flow changes with a consistent and reliable pulse output.
Wide voltage compatibility (DC 3.5–24V)
Flexible for use in a wide range of industrial and consumer applications.
RoHS compliant and eco-friendly materials
Constructed from high-quality POM, fully meeting international safety and environmental standards.
4. Applications
Coffee machines
Water dispensers
Vending water machines
Water purification systems
Ideal for precise flow monitoring and control in small appliances and automated systems.
5. FAQs
Q1: Can it be used with hot water?
A1: The sensor is recommended for cold or room-temperature water. Using hot water may shorten its service life.
Q2: How accurate is the flow measurement?
A2: The sensor provides ±2% accuracy, delivering reliable performance for most applications.
Q3: What precautions should be taken during installation?
A3: Protect the sensor from impact, chemical exposure, dropping, or physical collisions to avoid damage.
About Prime Living
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We are committed to fast order processing, secure packaging and reliable tracked shipping to provide an excellent shopping experience.
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.