Online pH/ORP Controller with RS485 Digital Output

Engineered as a budget-friendly option for industrial applications, this cost-effective analyzer features an automated 3-point pH and 2-point ORP calibration setup behind password protection to deliver dependable electrochemical data.

Model： APX2-C1Z
Parameters： pH / ORP
Delivery Time： 2-5 weeks
MOQ： 1

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Overview
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Overview

Display Range: pH: 0~14pH, ORP: ± 2000mV, Temp: -10~150℃
Resolution: pH: 0.01pH, ORP: 1mV, Temp: 0.1℃
Accuracy: pH: 0.02pH ORP: ±2mV

Features

2 Relay Outputs

Supports flexible automatic control of dosing pumps, solenoid valves and high/low alarm triggering.
1-channel 4-20mA Current Output

Transmits real-time pH/ORP measurement data to PLC or secondary display instruments.
2-Wire RS485 Digital Output

Adopts Modbus-RTU protocol for reliable long-distance networking and data upload.

Application

This APX2-C1Z online pH/ORP controller supports continuous real-time monitoring and automatic regulation of water pH and redox potential. Thanks to flexible relay control, analog signal transmission and 2-wire RS485 communication, it can be seamlessly integrated with PLC, dosing pumps and remote monitoring systems. Widely deployed in industrial wastewater treatment, electroplating production lines, circulating cooling water, pure water preparation, chemical processing and aquaculture to stabilize water quality parameters, automate dosing control and satisfy environmental compliance requirements.

Applicable Scenarios

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

Technical Data

Controller Model	APX2-C1Z
Measuring Parameter	pH/ORP
Measuring Principle	pH: Glass pH electrode (Hydrogen ion concentration index) ORP: platinum or gold electrodes (Redox potential)
Measuring Range	pH: 0～14 pH ORP: -2000mV～+2000mV Temp: -10～150℃
Resolution	pH: 0.01 pH ORP: 1 mV Temp: 0.1°C
Accuracy	pH: ±0.02pH ORP: ±2mV
Potential Stability	0.05% FS every 24 hours without accumulation
Potential Repeatability	±0.1%
Temperature 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	1-channel 0/4~20 mA, Max. load 1000Ω, supports long-line calibration
Language	English
Display	128 x 64, 3.2-inch graphic dot matrix LCD
Calibration Method	pH: 3-points, ORP: 2-points, the calibration points can be set freely Supports on-site offset correction
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