Online pH/ORP Controller with Two 4-20mA Outputs

Featuring a two-wire RS485 Modbus interface and dual 0/4~20mA current outputs, the APX1-C2 pH/ORP controller is perfect for smart, integrated industrial water networks requiring advanced digital communication.

Model： APX1-C2
Parameters： pH / ORP
Delivery time： 2-5 weeks
MOQ： 1

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Overview
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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℃
Accuracy: pH: ±0.02pH, ORP: ±2mV

Features

Two Programmable Relays

Two independent relays support automatic chemical dosing and alarm triggering, realizing on-site closed-loop control for water treatment process.
2-channel 4-20mA Analog Outputs

Dual current outputs can transmit two sets of signals independently (e.g. pH&ORP or measured value&temperature). Eliminates extra transmitters, simplifies system wiring for PLC/DCS integration.
RS485 Modbus-RTU communication

Digital communication interface enables remote data reading and parameter configuration, convenient for connecting to SCADA and centralized monitoring systems.

Application

APX1‑C2 panel‑mount online pH/ORP controller is widely used in water treatment, cooling tower, swimming‑pool and industrial process applications. Dual 4‑20 mA outputs enable dual‑signal transmission for automation systems. Together with relay dosing control and RS485 digital interface, it provides reliable monitoring and closed‑loop control for on‑site water‑quality management.

Applicable Scenarios

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

Standard

Controller Model	APX1-C2
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: ±0.02 pH ORP: ±2 mV
Potential Stability	24h Drift: ≤0.05% FS, no accumulation
Potential Repeatability	±0.1%
Temperature Unit	NTCK10K (B3435), PT1000 (two-wire) PT100 (two-wire) can be customized
Temperature Compensation	Automatic or manual
Display Screen	3.2-inch graphic dot matrix LCD
Operation Panel	4-panel keys
System language	English
Calibration Method	pH: 3 points, ORP: 2 points, offset
Power-off Protection	When powered off, the settings data are permanently retained
Menu Password	Access control management, 6-digit password setting
Quick Maintenance	Quick calibration menu, no need to enter the main menu
Relay Output	2 configurable SPST relays, Max. Load 3A/250VAC; supports High/Low alarm, Temperature, or Cleaning control.
Current Output	Two 0/4~20mA, Max. load 1000Ω, supports long-line calibration
Digital Output	A two-wire RS485 interface, Modbus RTU
Protection Rating	IP66
Operating Conditions	0~60°C, RH < 95%, non-condensing
Storage Conditions	-20~70°C, RH < 55%, non-condensing
Controller Dimension	100mm x100mm x 120 mm (Hole size 92mm x 92mm)
Controller Material	Enhanced ABS
Installation Method	Panel (default) or wall mounting(order)
Power & Consumption	Max. 3W
Net Weight	500g