Anyone in the water purification, sewage treatment and circulating water industry knows that metering pumps are the core of chemical dosing systems. Picking the wrong model leads to inaccurate dosing, frequent equipment breakdowns and unnecessary cost losses. Today we’ll break down three common electromagnetic diaphragm metering pumps in plain language, easy to understand for both purchasing and maintenance personnel.
Ⅰ.CD-MF Basic Model: Specially for small-sized equipment, ready-to-use right out of the box
This microprocessor-controlled digital manual metering pump is ideal for low-volume chemical dosing applications.
Performance Parameters:
Pressure range: 0–20 Bar; Max flow rate: 110 L/H.
It fully meets demands for residential water purifiers, small circulating water systems and mini wastewater treatment units.
Wide voltage support: 110–220V, compatible with domestic use and export markets.
Product Advantages:
Comes with a complete set of installation accessories, including inlet/outlet pipes, filter foot valve and injection valve. No extra auxiliary parts required for separate purchase.
Compact body design allows installation inside equipment control cabinets. Operators can manually adjust flow rate effortlessly with zero learning curve.
Applicable Scenarios:
Small pure water machines, simple community chemical dosing units and integrated mini wastewater treatment equipment.
II. CD-A Multi-functional Model: The top choice for automated projects, compatible with automatic control linkage
Choose this model if your project requires automatic chemical dosing. Conventional metering pumps only support manual adjustment, while the CD-A can be matched with a full intelligent control system. It connects to flowmeter pulse signals and PLC current signals, and is compatible with PH/ORP water quality meters. The pump automatically adjusts dosing volume according to fluctuations in water quality, eliminating the need for on-site manual monitoring.
It comes with an easily detachable vertical bracket. A full range of models covers various flow rates, making it suitable for side-by-side installation on skid-mounted equipment for large-scale projects.
Applicable Fields
Industrial circulating water systems, large wastewater stations, electroplating wastewater treatment, and fully automatic dosing systems for swimming pools.
III. CD-KF Cost-Effective Stable Model: High cost performance for mass matching in medium and small-scale projects
This is also a digital display electromagnetic metering pump featuring stable performance, long service life and outstanding cost efficiency.
Its electric control delivers smooth operation with minimal fluctuation in chemical dosing flow. Equipped with a sturdy base, it rarely malfunctions under long-term continuous operation.
Simple operation enables new maintenance staff to master repairs quickly, and it offers lower procurement costs for equipment manufacturers purchasing in bulk.
Applicable Scenarios
Reclaimed water reuse systems, commercial water purification, secondary water supply disinfection, and mass assembly of standard complete chemical dosing equipment.
IV. Quick Selection Cheat Sheet to Avoid Wrong Model Choices
Small standalone unit, limited budget, manual dosing only → CD-MF
Large-scale projects, full automatic control, linkage with water quality instruments required → CD-A
Mass installation for medium & small projects, balance reliability and cost → CD-KF
V. Practical On-site Tips
· Acid & alkaline chemicals: Standard pump head material is PVC for common reagents. PVDF pump heads are optional for highly corrosive chemicals upon order placement.
· Reserve sufficient flow margin during model selection: Set actual dosing capacity at 60%–80% of the pump’s rated flow. Avoid long-term full-load operation to extend diaphragm service life.
· Do not cut corners on accessories: The filter foot valve blocks impurities to prevent pump head clogging and lower maintenance frequency.
· Choose CD-A directly for automated projects. Ordinary pumps cannot connect to automatic control systems, which will lead to costly later retrofits.
These three metering pumps cover all chemical dosing scenarios for water treatment projects of all sizes. Select the proper model according to your demands to guarantee accurate dosing and cut long-term maintenance expenses.
