Dule Channels Analog PH And ORP Controller With RS485 For Industrial Wastewater Treatment

Daruifuno brand APX2-PD dual-channel controller usually supports simultaneous connection of one analog pH electrode and one analog ORP (oxidation-reduction potential) electrode, or two analog pH sensors and two analog ORP sensors. The pH value and oxidation-reduction potential (mV value) of the solution are collected respectively. The internal analog circuit converts the electrode signal into a standard voltage signal, amplifies and filters it, and then the microprocessor of the controller performs numerical processing and judgment, thereby outputting a relay control signal or an analog current (such as 4-20mA) signal.
pH channel: measures pH (0-14) and controls acid/base dosing.
ORP channel: measures oxidation-reduction potential (±2000mV) for disinfection (such as chlorination) or dechlorination.
The electrode is connected to the controller terminal; the controller relay output is connected to the dosing pump, alarm or cleaning device; the control logic, calibration, cleaning cycle, etc. can be set through the menu; regular calibration and data viewing are supported.

Product Parameters

​Advantages and features

• Dual-channel input: supports simultaneous connection of two electrodes (pH+pH, ORP+ORP, or pH+ORP) monitors pH and ORP at the same time, improves efficiency and saves installation space
• Dual-channel relay output: can set high/low alarm, dosing control and other functions
• Analog signal output (4-20mA): provides 4-20mA output, which is convenient for docking with PLC and DCS systems
• High-definition LCD display Real-time display of pH/ORP, electrode status, temperature, relay status, etc.
• History recording function: stores measurement data and alarm records for easy traceability
• Electronic clock: provides timestamp, cooperates with data recording Built-in history record and electronic clock, you can query the time of key events
• Automatic cleaning control: provides cleaning relay output, supports timing or conditional trigger cleaning function to extend electrode life
• Multiple calibration methods: supports 1-point, 2-point or multi-point calibration to improve accuracy
• Two Channels are isolated from each other
• Each channel can be connected to an independent temp. system.
• When pH, ORP and temp. are tested at the same time, the algorithm inside the meter can simultaneously evaluate the disinfection ability and display pH, ORP, temp. and chlorine values.
• Meet pH/ORP monitoring, dosing control, and data signal remote transmission at the same time.
• Menu-based operation Multi-language support, user-friendly interface, simple operation

Daruifuno PH ORP controller APX2-PD history record and electronic clock function1. History recording function
1.Store measurement data, alarm events, etc.
Recording interval can be set (such as every 10 minutes)
2. Electronic clock function
Real-time clock module to ensure accurate event recording time

Daruifuno PH ORP controller APX2-PD two-way relay control dosing principle
Set the pH upper/lower limit. When the set value is exceeded, the relay will be activated.
Example: pH > 9, start the acid dosing pump;
pH < 6, start the alkali dosing pump;
You can set the hysteresis interval to avoid frequent switching.

Daruifuno PH ORP controller APX2-PD automatic cleaning control principle

The cleaning relay can be set to start at a fixed time (such as every 24 hours); the flushing time setting
starts the solenoid valve or water pump to clean the electrode
avoids measurement errors caused by adhesion on the electrode surface.

Daruifuno PH ORP controller APX2-PD pH and ORP calibration method
1. pH calibration:
Use standard buffer: pH 4.01, 7.00, 10.01, PH ORP controller produced by our company Daruifuno, the calibration point can be set freely.
Single point calibration: Use pH 7.00 liquid to calibrate the zero point.
Two-point calibration: pH 7.00 and 4.00 or 10.00, calibrate the zero point and slope.
The controller guides the operation, automatically determines stability and stores.
2. ORP calibration:
Use standard buffer, such as +220mV or +470mV.
The calibration process is simple, usually a single point is sufficient.

Daruifuno PH ORP controller APX2-PD controller installation methodInstallation method:
Panel installation (opening installation, IP66 protection panel)
Wall installation (adaptive protection shell)
Pipeline installation
Installation environment:
Avoid direct sunlight, high temperature and high humidity;
Cables are routed separately to avoid sharing the same wiring trough with power lines;

​Aplication:
◇ Surface water
◇ Source water
◇ Aquaculture waters
◇ Landscape water
◇ Import of the waterworks

◇ Water treatment monitoring

◇ Drinking water,

◇ Groundwater, swimming pool

◇Industrial process monitoring and dosing control management

◇Chemical, petroleum, paper, food and medicine, electroplating, PCB manufacturing, etc.
◇ Municipal/industrial water treatment

◇ Circulating cooling water monitoring

◇ Electroplating/chemical liquid control

◇ Food and beverage production line
◇ Acid-base neutralization reaction tank control