Choosing the Right pH Meter: Optimize Your Chemical Dosing Control
Water management is fundamental to industrial processes, and pH measurement plays a critical role in chemical dosing control systems across multiple industries.
Chemical Dosing Control Fundamentals
A chemical dosing system integrates multiple functions including precise dosing, thorough mixing, fluid transfer, and automatic feedback control.
Key Industries Using pH-Controlled Dosing:
- Power plant water treatment
- Boiler feedwater conditioning
- Oilfield dehydration systems
- Petrochemical processing
- Wastewater treatment
pH Measurement in Dosing Control
1. Continuous Monitoring
Online pH meter tracks fluid pH in real time
2. Signal Processing
Controller compares reading to setpoint
3. Automated Adjustment
4-20mA signal adjusts metering pump rate
Critical Factor:
pH meter accuracy and stability directly determine dosing precision and system efficiency.
Essential pH Meter Features
Watchdog Timer
Prevents system crashes by resetting the controller if it becomes unresponsive
Relay Protection
Automatically shuts down dosing during abnormal conditions
Relay-Based pH Control
The most common method for wastewater treatment and industrial applications where extreme precision isn’t required.
Acid Dosing (Lower pH)
- High alarm trigger: pH > 9.0
- Stop point: pH < 6.0
- Wired to HO-COM terminals
Alkali Dosing (Raise pH)
- Low alarm trigger: pH < 4.0
- Stop point: pH > 6.0
- Wired to LO-COM terminals
Important Consideration:
Chemical reactions require time. Always include a safety margin in your stop points to account for pump flowrate and valve response times.
Advanced Analog Control
For processes requiring higher precision, 4-20mA analog control provides proportional adjustment.
Alkali Dosing Configuration
- 4mA = pH 6.0 (minimum dose)
- 20mA = pH 4.0 (maximum dose)
- Dosing rate increases as pH decreases
Acid Dosing Configuration
- 4mA = pH 6.0 (minimum dose)
- 20mA = pH 9.0 (maximum dose)
- Dosing rate increases as pH increases
Advantages of Analog Control:
- Continuous proportional adjustment
- Eliminates abrupt pump cycling
- Reduces wear on equipment
- Improves chemical usage efficiency
Precision Made Simple
Selecting the appropriate pH meter and control strategy transforms chemical dosing from a manual challenge into an automated, optimized process.
“Smart control begins with accurate measurement – the right tools create stable, efficient dosing systems.”
Optimize Your Dosing System
Our instrumentation specialists can help you select and implement the ideal pH control solution
Post time: Apr-29-2025