pH Sensor Transmitter Wastewater Treatment Online Acid-Base Detection Device - AMT-PH300

Smart type pH The sensor is also calledDigital pH Sensors, is based on traditional analog pH Based on the electrode, signal amplification,AD Conversion, temperature acquisition, and processing are fully integrated inside the probe body, directly outputting digital signals for online detection equipment, mainly used for continuous measurement of water pHpH Value, while simultaneously outputting temperature,ORP Oxidation-reduction potential data, widely used in industrial, environmental, water utility, aquaculture, and other online monitoring scenarios.

Traditional analog pH electrode: outputs weak millivolt analog signal, amplification, compensation, and calculation all rely on backend instruments; Smart pH sensor:All calculations are completed inside the probe, directly outputting pH value, no need for matching dedicated pH meter, can directly connect to PLC, microcontroller, DTU, cloud platform.

I.pH Sensor Transmitter Wastewater Treatment Online Acid-Base Detection DeviceWorking principle

The core measurement principle remainsGlass electrode potentiometric method (Nernst equation)

1. The probe internally containspH Sensitive glass electrode+ Ag/AgCl Reference electrode+ Built-inPT1000 Temperature sensor；
2. Hydrogen ions in the measured solution contact the glass sensitive membrane, generating a millivolt-level potential difference;
3. Built-in circuit board converts weak mV Signal amplification, filtering,A/D Converted to digital;
4. Read temperature data,Internal algorithm completes automatic temperature compensation ATC, eliminating the effect of temperature on pH Effect of slope, directly calculating the finalpH；
5. Through digital communication interface, pH, temperature, rawmV Value output.

Theoretical slope at 25℃: 59.16mV/pH, slope changes with temperature, so temperature compensation is essential. A few models use ISFET solid-state ion-sensitive field-effect technology, without fragile glass bulbs, suitable for special working conditions.

II.pH Sensor Transmitter Wastewater Treatment Online Acid-Base Detection DeviceInternal hardware structure

1. Sensing head：pH Sensitive glass bulb, reference diaphragm (salt bridge), gel electrolyte; some dual salt bridge designs resist contamination and sulfide poisoning;
2. Temperature element：PT1000/NTC, close to the electrode, real-time measurement of medium temperature;
3. Signal processing board (smart core): High-impedance amplifier,ADC、MCU Microprocessor, memory chip;

✨Calibration parameters, zero point, slope directlyStored locally in the sensor probe, unplug it and switch to another device, calibration data will not be lost, achieving plug-and-play.

1. Communication drive unit：RS485、SDI12, some also support420mA；
2. Enclosure：PVC/PP/PEEK，IP68 Waterproof, can be submerged for long periods.

III.pH Sensor Transmitter Wastewater Treatment Online Acid-Base Detection DeviceMain technical parameters (general industrial model)

Table

Item	Parameter
Measurement range	0.0014.00 pH
分辨率	0.01 pH
Measurement accuracy	±0.02~±0.05pH
temperature measurement	060℃, PT1000, automatic temperature compensation
Output interface	RS485 ModbusRTU (mainstream); optional 420mA, SDI12
Power supply	DC1224V
防护等级	IP68
Pressure tolerance	00.5MPa
Response time	T90＜510s
Stability	≤0.02pH/24h

4. Smart Core advantages of pH sensor (compared to traditional analog electrode)

1. Signal digitization, strong anti-interference, long wiring distance Analog mV Signal is easily interfered by frequency converters and motors, cable generally does not exceed20 Meters; smart digital signalRS485 Can reach up to thousands of meters, suitable for long-distance on-site installation.
2. Calibration data stored locally, plug-and-play Calibration is stored in the probe, no need for repeated calibration on the control cabinet instrument; it can be calibrated in the lab and then directly installed and used on site.
3. Built-in diagnostic function (high-end ISM Series) Internally monitors electrode aging, diaphragm blockage, glass bulb contamination, outputs electrode slope and impedance, predicts lifespan, provides early fault warnings, reducing downtime and maintenance.
4. Integrated temperature compensation, no need for external temperature probe Analog systems often require an additional temperature electrode; the smart probe integrates temperature acquisition and compensation in one unit.
5. Simple system integration Direct integration PLC, microcontroller,DTUIoT cloud platform, no need for expensive dedicatedpH Transmitter, reducing overall system cost.
6. Some support remote calibration Send calibration commands via communication protocol, no need to disassemble the probe, complete calibration remotely.

Shortcoming: electrode glass bulb and electrolyte will age, still require regular maintenance, not maintenance-free.

V.pH Sensor Transmitter Wastewater Treatment Online Acid-Base Detection DeviceCommon output types

1. RS485 ModbusRTU(most commonly used) Register readout:pH Value, temperature, rawmV, electrode slope; suitable for IoT,PLC、SCADA System, multi-sensor bus networking.
2. 420mA Current output type smartpH Convert pH Mapped to420mA Analog quantity, connect to ordinary acquisition modules.
3. SDI12 Low-power sensor interface for environmental monitoring and hydrological field stations.

Six,pH Sensor Transmitter Wastewater Treatment Online Acid-Base Detection DeviceApplication scenarios

1. Wastewater treatment plant: Aeration tank, neutralization tank pH Automatic adjustment;
2. Environmental water quality monitoring: River, reservoir, sewage outlet online monitoring stations;
3. Aquaculture: Real-time monitoring of fish ponds and shrimp ponds pH Monitoring;
4. Industrial process: Electroplating, chemical, pharmaceutical, water treatment dosing control;
5. Drinking water supply, surface water monitoring; laboratory online processes; food fermentation CIP/SIP High-temperature sterilization process (hygienic digitalpH）。