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Online Dual-channel pH ORP Controller

Equipped with 2 independent measurement channel inputs, this advanced instrument simultaneously processes electrochemical sensor data and applies a built-in matrix to estimate residual chlorine up to 2.5 mg/L for swimming pools and water treatment facilities.

Model： APX2-PD
Parameters： pH ORP
Delivery time： 2-5 weeks
MOQ： 1

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Overview

Information

Display Range: pH: 0~14pH, ORP: ± 2000mV, Temp.: -10~150℃
Resolution: pH: 0.01pH, ORP: 1mV, Temp: 0.1℃
Dimension: 144cm*144cm*120cm

Features

Dual-channel pH ORP controller

Supports conneting two pH sensors or two ORP sensors, or one pH plus one ORP sensor. Calculates estimated free-chlorine value by pH-ORP algorithm for pool water disinfection monitoring.
Two relays & dual 4-20mA outputs

Two programmable relays realizechemical dosing or alarm; dual-channel 4-20mA analog outputs transmit measured values to PLC and other systems.
RS485 communication and data logging

Built-in RS485 Modbus-RTU interface for remote data acquisition, time-stamped historical data record supports local data review and download.

Application

The APX2-PD dual-channel online pH ORP controller is ideal for online monitoring and automatic dosing control. Its flexible dual-channel input allows mixed pH-ORP measurement, and free-chlorine estimation function is well-suited for swimming pool water quality supervision. With relays, 4-20mA, RS485 and historical logging functions, it can integrate seamlessly with industrial automation system, widely applied in circulating water, water park, wastewater treatment and recreational water disinfection scenarios.

Applicable Scenarios

Water & Wastewater
Aquaculture
Energy & Power Generation
Food & Beverage
Agriculture & Hydroponics
Plating

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Model	APX2-PD
Principle	pH: Glass pH electrode (hydrogen ion concentration index) ORP: Platinum or gold electrodes (redox potential)
Measuring Objects	2 measurement channel inputs; pH or ORP can be selected arbitrarily
Display Range	pH: 0~14pH, ORP: ± 2000mV, Temp: -10~150℃
Resolution	pH: 0.01pH, ORP: 1mV, Temp: 0.1℃
Accuracy	0.1% of the measuring range or ±0.02pH / ±2mV, take the larger one
Stability	0.05% of measuring range every 24 hours without accumulation
Repeatability	Better than 0.1% of measuring range
Temp Compensation	Automatic or manual (NTC10K/PT1000 @customized)
Relay Output	Two SPST relays, Max. load 3A/250VAC, set high/low alarm, temp. or clean control
Digital Output	A two-wire RS485 interface, Modbus RTU
Current Output	Two 0/4~20mA, Max. load 1000Ω, supports long-line calibration
Electronic clock	Year/month/date, hour/minute/second
Historical Data	Historical data query and download, records the last 100 calibration maintenance data
Valuation Object*	Built-in matrix (equivalent to residual chlorine) 0~2.5mg/L Support user-defined (20x20 matrix) Linear correspondence (water sample stability)
Language	English
Display	128 x 64, 3.2-inch graphic dot matrix LCD
Calibration Method	pH: 3 points; ORP: 2 points, offset
Protection Grade	IP66
Enclosure Material	Enhanced ABS
Dimension	144mm x 144mm x 120mm (Hole size 138mm x 138mm)
Power Supply	AC: 100~240V 50/60Hz or DC:18~36V
Work Temperature	0~60℃, RH<95%, non-condensing
Storage Temperature	-20~70℃, RH<55%, non-condensing
Installation	Wall mounting, pipe clamp, panel mounting
Power Consumption	Max. 5W

Online Dual-channel pH ORP Controller

Overview

Information

Dual-channel pH ORP controller

Two relays & dual 4-20mA outputs

RS485 communication and data logging

Applicable Scenarios

Standard

Installation Guide

Optional Parts & Accessories

Wall Mounting Accessories

Panel Mounting Accessories

Rain Shield Installation Kit

Pipe Installation Kit

Online Dual-channel pH ORP Controller

Overview

Information

Dual-channel pH ORP controller

Two relays & dual 4-20mA outputs

RS485 communication and data logging

Applicable Scenarios

Standard

Installation Guide

Optional Parts & Accessories

Wall Mounting Accessories

Panel Mounting Accessories

Rain Shield Installation Kit

Pipe Installation Kit

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