Hunan, China
Business Type:
Manufacturer/Factory, Trading Company, Other
Management System Certification:
ISO 9001, ISO 14001
OEM/ODM Service
Sample Available
MEI Awards

Reverse Osmosis, Water Purification, Pump Control Controller manufacturer / supplier in China, offering Direct on Line Dol Control Unit for RO Reverse Osmosis RO-3-3, 0.37kw-2.2kw, Singel Pump Controller (S521) Ce Certification, AC220V Duplex Pump Controller (L922) with 30 Min Recovery Time of Over Load and so on.

Diamond Member Since 2012
Audited Supplier
Supplier Homepage Products pump control panel Direct on Line Dol Control Unit for RO Reverse Osmosis RO-3-3

Direct on Line Dol Control Unit for RO Reverse Osmosis RO-3-3

Get Latest Price
Min. Order: 10 Pieces
Port: Ningbo, China
Production Capacity: 60, 000 Sets Per Month
Payment Terms: L/C, T/T, Western Union, Paypal
Task: Program
Structure: Closed-Loop
Mathematical Model: Linear
Signal: Continuous
Function: Automatic Control, Protection, Monitoring
Certification: ISO: 9001, CE

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Basic Info

Model NO.
Input Voltage
AC380V 50Hz/60Hz
Three Phase
Rated Output Power
0. 75-15kw
Protection Grade
Qty of Controlled Pump
Dual Pumps
Leading or neutral
Transport Package
Box+Paper Carton
Big size
HS Code
1  About Product

Direct on line DOL control unit for RO reverse osmosis RO-3-3

Model RO-3-3 is specially designed for two three phase reverse osmosis water purification pump with DOL start type.

2)Parameter form 
ApplicationDesign for reverse osmosis water purification unit , DOL
ModelRO 3-3

Rated input voltage


Three phase

50HZ/ 60HZ

Rated input voltage for

RAW Water Pump(RWP)

High Pressure Pump(HPP)

Solenoid valve


Three phase(0.75-15kw)

Three phase(0.75-15kw)

Normally closed type(AC 220V)

Protection function

Over load protection

Pump stalled protection

Dry run protection with sensor free

Under voltage protection

Over voltage protection

Open phase protection

Control characteristic

Present terminal port for Pressure switch(LPS /HPS)

Present terminal port for Level senor in products tanker 

Present terminal port for Float switch in raw water tanker

Present terminal port for 2 dosing pumps,1 electrical meter

Controlling the 4 outputs:

Raw water pump(RWP)

High pressure pump(HPP)

The flushing solenoid valve 

No-Power Contact for Alarm

Other features

Pump accumulative running time displaying
Pump five faults record displaying
Parameter adjustment manually
Push button calibration
Memory function when power off & recovery
RS485 Communication
LCD screen displaying pump running status
Main installation data 
Working temperature-25ºC-- +55ºC
Working humidity20%--90%RH, no drips concreted
Degree of protectionIP54
Install positionWall mounting
Unit dimension (L x W x H)300*240*120mm

2  About us

1)Company Information 

Brief Introduction
Since 2001, Leading Science & Technology company has been providing pump control and protection solutions to pump users.
Today Leading Science & Technology offers a wide range of pump control panel & pump control accessories for the pump control and protection market.

Our products: Intelligent Pump Controller, Sewage Pump Controller, Booster Pump Controller, Deep Well Pump Control Box, Submersible Pump Controller, Pump Motor Starter,Programmable Logic Controller, IOT Pump Controller, Reverse Osmosis Controller.

For more information, please visit:

Our Team
Leading company has three major departments:
1. Sales Team
2. R&D Team
3. Production Team
Sales team collect the information and technical requirements from pump manufacturers, pump distributors, pump users etc and report to our R&D team. According to the information, R&D team will evaluate firstly and start to research,develop and test the pump controller. Finally once the pump controller is workable, our production team will produce.

With our team members' close cooperation, Leading company has been developing many unique control and protection technology for pump industry.

2)Our factory

Direct on Line Dol Control Unit for RO Reverse Osmosis RO-3-3

3)Our trading fair

Direct on Line Dol Control Unit for RO Reverse Osmosis RO-3-3

4)Customers visit factory.

Direct on Line Dol Control Unit for RO Reverse Osmosis RO-3-3

5)Qualification &Certificate

Direct on Line Dol Control Unit for RO Reverse Osmosis RO-3-3

1)Can i have some samples ?
Yes ,we can send you samples for testing,contact us for details.

2)What's delivery time ?
For standard pump control panel ,it usually takes about 7 working days;
For non-standard,it usually takes 15-20days ,please contact us for details.

3)Can I do OEM or ODM ?
Yes,we have our own engineering team and we do accept OEM and ODM,but there is ordering quantity requirement.

4)How does your factory do the quality control ?
Our production process follow up the ISO standard and we control the product quality from the raw materials to the finished product,each of our control panel will be fully assembled and strictly tested before packing and shipping.

5)What is the approximate life time for your control panel ?
The designed life time of control panel is 8 years.

6)What is your after sales service policy ?
According to the ordering quantity,we will give some free spare parts or controller for maintenance or replacement and we will give technical training.

7)How can i trust you ?
We have being developing the pump control panel manufacturing and selling for 15 years ,now many pump supplier from China and overseas are using our controller to control and protect their pump and motor.


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