pH Monitoring Sensors for Chemical Neutralization

Product Specifications

Technical details and manufacturing context for pH Monitoring Sensors

Definition

pH Monitoring Sensors are critical components within Industrial Chemical Neutralization Systems that provide real-time measurement of acidity or alkalinity levels in chemical solutions. These sensors enable precise control of neutralization reactions by detecting pH changes and transmitting data to control systems for automated adjustment of chemical dosing, ensuring optimal treatment efficiency and regulatory compliance. The sensors are designed for continuous operation in demanding chemical manufacturing environments, with a measurement range of 0–14 pH and an accuracy of ±0.01 pH at 25°C. They feature a response time of ≤30 seconds for 95% of the final value, allowing timely process adjustments. The operating temperature range is 0–80°C for the sensor body, though the electrode may vary, and the operating pressure range is 0–1.6 MPa, with pressures above 1.6 MPa potentially damaging the sensor. The ingress protection rating is IP65–IP68 for the transmitter and connector, ensuring resistance to dust and water ingress. The supply voltage is 12–36 V DC with reverse polarity protection, and the output signal is an isolated 4–20 mA two-wire loop. Electrical connections are quick-disconnect types with M12–M16 connectors. Wetted materials are corrosion-resistant, including 316L stainless steel and PTFE, and the process connection is available in NPT or G thread sizes from 1/2 to 1 inch. The weight ranges from 0.5 to 2.0 kg, depending on length and materials. These sensors are constructed with a pH-sensitive glass membrane, a reference electrode solution, a polymer body housing, and stainless steel fittings. They are intended for use in neutralization processes where precise pH control is essential. For any specific application, it is critical to verify model-specific values and standards with the legal manufacturer or supplier, as the listed parameters are reference ranges and may vary by model. The sensors are not certified to any specific standard unless explicitly stated by the manufacturer, and the listed standards (e.g., IEC 60529) are provided as procurement references only.

Working Principle

pH sensors operate based on the electrochemical potential difference between a pH-sensitive glass membrane electrode and a reference electrode. When immersed in a solution, hydrogen ions interact with the glass membrane, creating a voltage proportional to the pH level. This voltage is measured and converted to a pH value through the Nernst equation, typically displayed on monitoring equipment. The sensor's output signal, typically 4–20 mA, is transmitted to a control system for automated dosing adjustments.

Common Materials

pH-sensitive glass membrane, Reference electrode solution, Polymer body housing, Stainless steel fittings

Technical Parameters

Parameter	Typical range	Notes & selection driver
Measurement Range	0–14 pH	Full pH scale
Accuracy	±0.01 pH	At 25°C
Response Time	≤30 s	For 95% of final value
Operating Temperature	0–80 °C	Sensor body; electrode may vary
Operating Pressure	0–1.6 MPa	Above 1.6 MPa may damage sensor
Ingress Protection	IP65–IP68	For transmitter and connectorIEC 60529
Supply Voltage	12–36 V DC	Reverse polarity protected
Output Signal	4–20 mA	Isolated, 2-wire
Electrical Connection	M12–M16	Quick disconnect
Wetted Materials	316L–PTFE	Corrosion resistant
Weight	0.5–2.0 kg	Depends on length and materials
Process Connection	1/2–1 inch	NPT or G thread

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

pH-sensitive glass bulb Part
Primary sensing element that generates voltage proportional to hydrogen ion concentration

Material: Special pH-sensitive glass
Reference electrode
Provides stable reference potential for comparison with measuring electrode

Material: Silver/silver chloride or calomel
Electrolyte solution Part
Maintains electrical continuity between reference electrode and solution

Material: Potassium chloride solution
Sensor body Part
Protects internal components and provides mounting interface

Material: Chemical-resistant polymer or stainless steel
Junction
Allows controlled flow of electrolyte into solution while preventing contamination

Material: Ceramic, PTFE, or porous polymer
Signal Transmitter
Converts the electrode millivolt output into the 4–20 mA signal the dosing control reads.

Manufacturers of pH Monitoring Sensors

Manufacturer profiles associated with pH Monitoring Sensors.

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Frequently Asked Questions

What is the measurement range of these pH sensors?

The measurement range is 0–14 pH, covering the full pH scale. This allows monitoring of both acidic and alkaline solutions in neutralization processes.

What is the accuracy of the pH sensors?

The accuracy is ±0.01 pH at 25°C. This high precision is essential for tight control of neutralization reactions.

What are the operating temperature and pressure limits?

The operating temperature range is 0–80°C for the sensor body, though the electrode may vary. The operating pressure range is 0–1.6 MPa; pressures above 1.6 MPa may damage the sensor.

What output signal do these sensors provide?

The sensors provide an isolated 4–20 mA two-wire output signal, which is standard for industrial control systems. This allows for easy integration with PLCs and DCS.

Data Basis

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Preliminary Technical Classification

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pressure:	0-10 bar (standard), up to 25 bar (high-pressure variants)
flow rate:	0.1-5 m/s (optimal), up to 10 m/s (with protective housing)
temperature:	0°C to +80°C
slurry concentration:	Up to 30% solids by weight (with abrasion-resistant electrodes)

pH Monitoring Sensors

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