Dule Channels Analog PH And ORP Controller With RS485 And Two Relays Water Treatment

Daruifuno brand APX2-PD dual-channel controller connected to two analog signal channels at the same time: one can be selected for pH electrode and one for ORP (oxidation-reduction potential) electrode, both can be connected to analog pH electrode, and both can be connected to analog ORP electrode.
The analog signal (usually mV or 4~20mA) is amplified, filtered, linearly converted, and displayed, output or triggered relay action after internal processing. It supports measurement, calibration and control of pH and ORP respectively.

• Dual channels work independently: one device can monitor pH and ORP at the same time, saving equipment cost and installation space.
• High-precision measurement: stable signal, temperature compensation
• Two analog outputs: 4~20mA corresponding to pH and ORP can be output respectively, which is used to connect PLC and DCS systems.
• One RS485 Modbus output, RS485 is a differential signal communication interface with strong anti-interference ability, long communication distance (up to 1.2 kilometers), support for multi-point communication, etc., and is often used to connect to host computers, PLCs, DCS and other systems. It can transmit data remotely, and transmit the measurement data such as pH, ORP, temperature, etc. to the host computer system in real time through RS485. It can realize centralized monitoring, data acquisition and analysis. It can communicate with PLC/DCS system. It can communicate with PLC, DCS and other control systems through Modbus RTU protocol (most common) for process automation control.

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
Used for timing control (such as cleaning time, calibration)

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-mounted: embedded in the equipment or control cabinet panel, the opening size is about 92×92 mm.
• Wall-mounted: suitable for on-site wall installation, equipped with waterproof housing (IP65 or higher).
• Pipeline installation: fixed on the pipeline with a special bracket.

​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