A30PR ONLINE pH/ORP CONTROLLER

The A30PR is a high-grade pH and ORP controller for industrial settings that need to keep an eye on water quality all the time. The A30PR has a strong design that lets it monitor pH levels with an accuracy of ±0.01 pH in the range of 0 to 14 pH and ORP levels from -2000 to +2000 mV.
The A30PR is accurate, dependable, and adaptable for wastewater treatment, the chemical industry, food processing, and aquaculture systems that keep water quality high. The A30PR is easy to use for people of all skill levels because it has a menu-driven interface and can be calibrated at two or three points.

★★★★★

  • Short delivery time
  • Better price
  • Customizable parameters

Features

  • Diverse temperature compensation methods: PT1000, NTC10K, and manual temperature compensation are available.
  • One 4-20 mA output, corresponding to pH/ORP value, using isolation technology, strong anti-interference ability
  • A set of relays can switch between high and low points freely, and the hysteresis can be adjusted freely to avoid frequent on-off of the relays.
  • Customized segment code LCD screen with clear display.

Specifications

Measuring rangepH（0—14 pH，0.0—14.0 pH，0.00—14.00 pH ）
ORP( -1999 — +1999 MV)
Accuracy±0.01 pH; ±1 mV
Resolution0.01 pH; 1 mV
Stability≤ 0.02 pH/24 hours; ≤ 3 mV/24 hours
Temperature Compensation0–100 °C Manual / Automatic (PT1000/NTC10K)
Signal Output4–20 mA isolated protection output, independently corresponding to pH/ORP or temperature, with a load capacity up to 500Ω
Alarm OutputTwo sets of high/low point alarms (3A/250 V AC) normally open contact relay, one set of self-cleaning
Power SupplyAC220V or DC24V
Power Consumption≤ 7 W
Environmental ConditionsTemperature: 0–60 °C; Humidity ≤ 85% RH
Overall Dimensions46× 96× 110 mm (Height × Width × Depth)
Opening Size42 × 90 mm (height × width)

Where can it be used

Treatment of sewage

Stage of application

  • Inlet pH monitoring: Real time monitoring of raw water pH to protect subsequent treatment equipment
  • Biochemical pool pH regulation: maintain the optimal living environment for microorganisms (pH 6.5-8.5) and improve treatment efficiency
  • Monitoring of effluent compliance: ensuring that the discharged water quality meets environmental standards

Chemical production

Stage of application

  • Kettle for reactions pH control: exact control of the circumstances under which chemical reactions happen
  • Monitoring of the neutralization tank: control of the process for treating acid-base waste liquids
  • Circulating cooling water: stops pipes from corroding and building up scale

Food and Beverage

Application stage

  • CIP cleaning monitoring: confirm the completion of each stage of alkali washing, acid washing, and rinsing
  • Fermentation process control: real-time monitoring of fermentation pH for beer, yogurt, etc
  • Boiler feedwater: prevent equipment corrosion

Electroplating surface treatment

Application stage

  • PH control of electroplating bath solution: affecting the quality of coating
  • Monitoring of pre-treatment degreasing and acid washing processes
  • Neutralization tank for wastewater treatment

Guide for Selecting Temperature Compensation Methods

When choosing PT1000:
Process temperature range>20 ℃ (e.g. 5-60 ℃)
High precision temperature compensation is required (actual temperature within ± 0.5 ℃)
Outdoor installation or large seasonal temperature difference
Typical applications: sewage treatment, chemical reaction kettle

When choosing NTC10K:
Relatively stable temperature (within ± 10 ℃)
Cost sensitive projects
Normal temperature condition (15-35 ℃)
Typical applications: CIP for food, swimming pool water quality, aquaculture

When choosing manual compensation:
Laboratory constant temperature environment
Temperature change<5 ℃
Limited budget and low precision requirements
Typical applications: school training, small aquariums

Comparison of Core Differences

Comparative dimension

A10PR

A20PR

A30PR

Core positioning

Basic industrial grade, cost-effective universal model

Multi functional advanced model, flexibly adaptable to complex scenarios

Compact and space saving design, focusing on small size requirements

Overall Dimensions

96×96×128 mm

144×144×115 mm

48×96×110 mm

Installation method

Panel mounted

Panel mounted and wall mounted dual-mode

Panel mounted(requiring only 42 × 90 mm openings)

Relay configuration

Three groups (freely switch between high and low points)

Three groups (supporting 8 modes including in/out of range and time control)

One set (high and low point switching, adjustable hysteresis)

Signal output

1 channel 4-20mA (optional RS485)

2-channel 4-20mA (independently corresponding to pH/ORP/temperature, optional RS485)

1 channel 4-20mA (only corresponding to pH/ORP, optional RS485)

Protection level

–

–

IP54(dustproof and moisture-proof)

Applicable scenarios

Basic monitoring of small and medium-sized sewage stations, swimming pools, aquaculture, etc

Complex working conditions such as chemical, pharmaceutical, and municipal wastewater require synchronous output of multiple parametersV

Small production lines, laboratories, and control cabinets in beverage factories with limited space

Power consumption

≤ 7 W

≤ 5 W

≤ 7 W

Comparison of two communication methods

Application scenariosA20PR AdvantagesCommon products
Chemical workshop (high interference)Isolation output+dedicated cable, data fluctuation ≤ ± 0.02pH/24hVulnerable to electromagnetic interference and large data drift
Municipal wastewater treatment plant (humid environment)Waterproof junction box+leak proof installation, no risk of short circuitThe wiring is prone to moisture and has a high failure rate
Multinational factories (multilingual requirements)One click switching between Chinese and English, with no communication barriers during operationNeed to restart the device to switch, the process is cumbersome
Novice operator (non professional)Menu preview+prompt function, calibration completed in 3 stepsThe menu hierarchy is complex and prone to incorrect operation

Technical Support

The A30PR and A20PR are basically two sides of the same coin—their technical specs, dimensions, and core performance are identical. Both fit 96x96mm panel cutouts, hit a pH accuracy of 0.01%, and come with IP54 dust and water resistance. You also get two relay outputs and a dedicated 4–20mA signal for both models.
The only real difference? The name—they’re just branded differently for specific regions. Some areas use A20PR, others A30PR, but functionally, they’re the exact same controller. No matter which one you pick, you won’t miss out on any features or speed. Just go with whichever is more readily available in your area or aligns with local support needs.

The A30PR’s IP54 front panel classification protects it from dust and water splashes, so it can be used in outdoor settings that are protected from the elements, like covered control panels or weatherproof cabinets. But you shouldn’t be outside in the rain, snow, or bright sunlight.It is best to put the transmitter in a NEMA 4X or IP65 weatherproof box with a viewing window if you plan to use it outside all the time. It keeps the controller safe while still letting you see the screen. Remember that temperatures below 0°C or over 60°C are too high or too low for the controller to perform well. It needs temperature-controlled enclosures.

Most of the controller’s maintenance includes cleaning the front panel display and checking electrical connections annually. Main maintenance targets pH/ORP electrode and temperature sensor:
Weekly: Check electrode for coating or fouling
Monthly: Process-compliant electrode cleaning
Quarterly: Use buffer solutions to check calibration.
Annually: If reaction time or calibration slope drops below 85%, replace electrode.
Programmable automatic calibration reminders are available on the controller for process criticality. Non-volatile memory saves settings during power interruptions, eliminating reprogramming.

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A30PR integrates unparalleled precision (0.01% pH accuracy) into a compact 96x96mm design, providing certain advantages in areas where large units cannot be installed. With the sturdy IP54 dust and moisture resistance, reliable alarm dual relays, and anti-interference dedicated 4-20mA signal, chaotic industrial environments have been transformed into predictable and compatible spaces.
No need to explore complex settings or sacrifice performance for size – A30PR provides everything: reliability, accuracy, and simplicity. Whether it’s wastewater treatment or chemical production, A30PR is your best choice!

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