Flow meter for liquids

YJ series

Compact flow rate switch using magnetism
Does not cause significant pressure loss and offers high reliability

It detects small flow rates. Since this flow meter uses magnetism, it can measure small flow rates with high precision.

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A variety of models are available for many flow rate ranges and connection diameters. The mechanism is made of Noryl so it is rust proof and corrosion resistant.

Features, keys |Usages, use examples |Operation principle |Standard specifications

Features, keys

1. Optimal for controlling small flow rates.(0.5L/min to 20L/min)
   
2. Connect using threads or hoses.(R1/2", R3/4", ｆ21")
   
3. The housing is leak free, made as a one-piece molding. It offers high reliability; no springs are used.
4. The mechanism is rust proof and corrosion resistant.
   

Usages, use examples

• Disconnects the cleaning water in a cleaning unit.
• Cooling water for diesel engines, semiconductor production facilities, colorant monitoring, such as water glycol mixtures, pure water, and fluorinert.
• Assessing clogging in distilled water filters.
• Prevents running a pump dry.
• Monitors gas flow rates including air, and N2.

Operating principle

A lead switch is integrated above the switch body, and a bias magnet is integrated at its bottom. A magnet is integrated inside the flapper.
When a liquid flows at the maximum flow rate, the flapper is pushed and raised. The lead switch is closed by the magnet inside the flapper, and the contact points output signals.
When the flow rate drops, the flapper starts to lower by its own weight and reduce the magnetic flux in the bias magnet. The lead switch opens at a specified flow rate and the contact point is disconnected.
By changing the magnetic flux in the bias magnet, and finely adjusting the lead switch position, you can set the flow rate and maintain the precision you desire.

Standard specifications

Model name	YJKS-1	YJNK-1RAN	YJRN-1	YJHA-1
Shape
Material	Modified polyphenylene ether (PPE) * Option: Polypropylene
Connection method	Screw	Screw	Screw	Hose
Connection diameter	R1/2"	R1/2"	R3/4"	Φ21
Setting flow rate (water)	0.5 to 3.0 L/min	1.2 to 3.5 L/min	1.5 to 18L /min	3 to 12 L/min
Setting flow rate (air)	20 to 100 L/min	50 to 150 L/min	90 to 700 L/min	90 to 400 L/min
Contact point rating	1-SPST lead switch 100V DC 10W Max *option: 100V AC/DC
Operating pressure	1715kPa Max. (material PP: 686kPa)
Operating temperature:	0 to +86 degrees, no freezing
Lead wire	#24AWG (UL-1007) 300mm
Durability	10 billion or more
Shock proof performance	294m/s2(30G)Max.