pH/ORP Controller & Transmitter APX1-G2

APX1-G2 features a differential ground design with dual 4–20mA current outputs and RS485 Modbus communication, enabling higher stability, stronger anti-interference performance, and more reliable industrial process control.

Parameter（s）： pH / ORP
Delivery time： 2-5 weeks
MOQ： 1
Price： Contact Us

Option

AC:100～240V
DC：18～36V

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Overview
Specification
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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: 0.1% of the measuring range or ±0.02pH / ±2mV, take the larger one

Output/Communication

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, support long-line calibration

Features

Clever Simplicity

An intuitive design featuring automatic recognition and true plug-and-play convenience for effortless operation.
Highest Flexibility

A versatile, modular configuration that allows easy scaling and seamless adaptation to diverse monitoring needs.
Long-Lasting Reliability

Robust, durable construction engineered to deliver reliable and stable performance across diverse and harsh environments.

Application

Engineered to deliver highly precise and rapid-response monitoring, our solutions feature an intuitive design for effortless operation and quick setup. It is widely applicable across diverse settings, from municipal wastewater treatment and industrial effluents to surface water, swimming pools, and commercial aquaculture in ponds or lakes, ensuring reliable data wherever you need it.

Applicable Scenarios

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

Applicable Interfaces And Protocols

0/4~20mA
RS485, Modbus-RTU

Compatible with standard industrial protocols, ensuring easy and flexible system integration.

As a global manufacturer of water quality testing instruments, we have consistently focused on the R&D and production of analytical equipment. Guided by our core values of professionalism, responsibility, integrity, and innovation, we create value for our customers, serve the global market, and strive for mutually beneficial partnerships and shared growth.

Do your part for the environment—protect nature and embrace a green lifestyle with help from precision water-quality testing experts. Let us join hands to protect the Earth.

Standard

Controller Model	APX1-G2
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
Solution Ground	Differential ground
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
25℃ Conversion	Support
Display Screen	3.2-inch graphic dot matrix LCD
Operation Panel	4-panel keys
System language	English
Calibration Method	pH: 3 or 5 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