Inline pH/ORP Meter with Modbus Communication

Engineered as a budget-friendly solution for industrial water monitoring, this cost-effective instrument integrates standard 3-point pH and 2-point ORP calibration configurations alongside password protection to deliver high-tier functional value without premium expenses.

Model： APX1-C1Z
Parameters： pH / ORP
Delivery time： 2-5 weeks
MOQ： 1

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Overview
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Show All Products: Show All pH / ORP Sensor & Controller

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 SPST Relays

Offer switch output to realize automatic dosing control and on‑site alarm activation.
1‑channel 4‑20 mA Analog Output

Transmit pH/ORP measurement data to PLC or other secondary industrial devices.
RS485 Modbus‑RTU digital communication

Supports data interaction with upper‑system to satisfy field digital‑control requirements.

Application

Designed for compact panel‑mount installation, the cost‑effective APX1‑C1Z inline pH/ORP meter is ideal for circulating cooling water dosing control, general industrial and municipal wastewater monitoring, as well as budget‑limited swimming‑pool water quality management. Equipped with relays, 4‑20 mA analog output and RS485 Modbus‑RTU communication, it delivers automatic dosing, alarm functions and digital data upload to PLC systems for on‑site centralized monitoring.

Applicable Scenarios

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

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.

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Standard

Controller Model	APX1-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	24h Drift: ≤0.05% FS, no accumulation
Potential Repeatability	±0.1%
Temp Compensation	NTCK10K (B3435), PT1000 (two-wire) PT100 (two-wire) can be customized
Relay Output	Two SPST relays, Max. load 3A/250VAC, set high/low alarm, temp. or clean control
Current Output	A 0/4~20 mA, Max. load 1000Ω, supports long-line calibration
Digital Output	A two-wire RS485 interface, Modbus RTU
Language	English
Display Screen	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	100mm x 100mm x 120mm (Hole size 92mm x 92mm)
Power Supply	AC: 100~240V 50/60Hz or DC:18~36V
Working Temperature	0~60°C, RH < 95%, non-condensing
Storage Temperature	-20~70°C, RH < 55%, non-condensing
Installation Method	Panel (default) or wall mounting(order)
Power Consumption	Max. 3W
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
Net Weight	500g