Digital pH Meter Online – Panel Mounted for Industrial Use

Our Digital pH Meter Online is a heavy duty, panel mounted Online pH Meter designed for continuous industrial use. It provides accurate pH measurement for process plants, water treatment, effluent treatment (ETP/STP), chemical, pharma, food and other industrial applications.

This Digital pH Meter works on the principle of hydrogen ion concentration. The meter measures the potential difference generated by the pH electrode due to the movement of hydrogen ions (H⁺) across the special glass membrane and converts it into a pH value on the bright LED display.

Whether you are looking for a pH Meter Online for your plant or a reliable Digital pH Meter for industrial use, this model offers simple operation, easy calibration and rugged performance.

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Key Features – Online Digital pH Meter

• Panel mounted, industrial grade design – suitable for control panels and field panels

• Digital pH Meter Online for continuous monitoring

• 2-point calibration at 4.00 pH and 7.00 pH

• Front panel calibration screws – easy adjustment without opening the instrument

• Bright 7-segment LED display for clear visibility

• Compatible with any standard pH probe with BNC connector

• Heavy duty body made from PP/ABS for long life

• Designed for 24×7 industrial use in harsh environments

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Technical Specifications : Digital pH Meter Online

• Range: 0.00 to 14.00 pH

• Resolution: 0.01 pH

• Calibration:

  • 2-point calibration at 4.00 pH and 7.00 pH

  • Front panel calibration screws for 4 and 7 pH

• Input: pH Probe / pH Electrode – any standard brand, BNC connector

• Display: Bright 7-segment LED display

• Operating Voltage: 220 VAC, single phase

• Enclosure Size: 96 × 96 × 85 mm (panel mounting)

• Body Material: PP / ABS

• Application Type: Online pH Meter, panel mount, industrial use

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How a Digital Online pH Meter Works ; why use pH Meter Uma Industries

The pH value indicates the concentration of hydrogen ions (H⁺) in a solution:

• pH < 7.0 – solution is acidic (high H⁺ ion concentration)

• pH = 7.0 – solution is neutral

• pH > 7.0 – solution is alkaline (low H⁺ ion concentration, higher OH⁻)

When the pH probe is dipped into a solution:

1. Hydrogen ions from the solution interact with the glass membrane of the electrode (outer side of the bulb).

2. Inside the bulb, there is a buffer solution of known pH (typically pH 7.0).

3. The difference in hydrogen ion concentration inside and outside the bulb creates a potential (voltage) difference across the membrane.

4. The Digital pH Meter measures this potential difference between the measuring and reference electrode and calculates pH according to the Nernst equation.

In simple words, the Online pH Meter converts the electrical signal from the pH electrode into a digital pH reading on the display.

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Calibration Process – Digital pH Meter Online

Follow this step-by-step procedure to calibrate your Digital pH Meter Online:

1. Prepare the pH Probe

   • Gently clean the pH sensor / pH probe using distilled (DM) water.

   • Do not wipe the glass bulb roughly – just rinse and gently shake off excess water.

2. Calibrate at 7.00 pH

   • Dip the pH probe in a standard buffer solution of 7.00 pH.

   • Wait for about 2 minutes until the reading becomes stable.

   • Adjust the “7 pH” calibration screw on the front panel.

   • Match the display to 7.00 ± 0.05 pH.

3. Rinse the Probe

   • Remove the probe from the solution.

   • Rinse gently with DM water and shake off excess drops.

4. Calibrate at 4.00 pH

   • Dip the pH probe in a standard buffer solution of 4.00 pH.

   • Wait again for about 2 minutes till the reading is stable.

   • Adjust the “4 pH” calibration screw on the front panel.

   • Match the display to 4.00 ± 0.05 pH.

5. Repeat to Confirm

   • For best accuracy, repeat the above steps once more (7.00 pH and then 4.00 pH).

   • This ensures the calibration of the online pH meter is perfect.

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Types of pH Meters We Offer

We supply a wide range of Digital pH Meters and Online pH Meters for different applications:

1. Digital pH Meter – Online Panel Mounted

   • 2-point calibration (4.00 & 7.00 pH)

   • Ideal for continuous industrial monitoring

2. Online pH Meter with 0–10 V Analog Output

   • 2-point calibration

   • Suitable for PLC / data logger / SCADA integration

3. Digital pH Meter with 0–20 mA Output

   • 2-point calibration

   • For industrial process control and automation

4. Digital pH Meter with RS-485 Modbus Protocol

   • 2-point calibration

   • Easy connectivity to modern control systems and remote monitoring

5. Table Top pH Meter for Laboratory Use

   • Ideal for labs, R&D and quality control applications

6. pH Sensor / Probe / Electrode

   • Replacement pH sensor / pH probe compatible with our pH controllers and pH meters

You can link each of the above points to separate product pages if available.

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Typical Industrial Applications

• Effluent Treatment Plants (ETP) & Sewage Treatment Plants (STP)

• RO & DM water plants

• Chemical and process industries

• Food & beverage plants

• Pharmaceutical and biotech units

• Electroplating and surface treatment plants

• Cooling water and boiler water monitoring

Wherever continuous pH monitoring is required, this Online pH Meter is a reliable choice.

Digital Online pH Meter (Continuous pH Monitoring & Control) – Uma Industries, Faridabad

Uma Industries (Faridabad) offers a high-performance Digital Online pH Meter designed for continuous, real-time pH monitoring in industrial and water treatment applications. This instrument is ideal for ETP/STP plants, process industries, chemical dosing systems, RO plants, cooling towers, and wastewater monitoring, where stable pH measurement and control are essential.

Our Online pH Meter provides reliable readings 24×7 and supports automation options such as relay outputs for dosing pump control, along with signal outputs (model-dependent) for process monitoring and integration with control systems.

Key Benefits

• Continuous pH monitoring (24×7)

• Stable and accurate performance for industrial use

• Dosing pump control support (relay output in controller models)

• Suitable for ETP/STP, chemical processes, water treatment

• Easy calibration and maintenance

• Long sensor compatibility and replaceable electrode option

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Applications of Online pH Meter

Our Digital Online pH Meter is widely used in:

• Effluent Treatment Plant (ETP)

• Sewage Treatment Plant (STP)

• Neutralization & chemical dosing systems

• Water treatment plants

• RO plants and filtration systems

• Cooling tower & boiler water monitoring

• Chemical, textile, paper, plating, and process industries

• Food & beverage and pharma utilities (as per process need)

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Typical Specifications (General)

(Specifications may vary by model and configuration.)

• Measurement Range: 0.00 to 14.00 pH

• Display: Digital pH display for real-time monitoring

• Outputs: Relay / 4–20mA / RS485 (Modbus RTU) options in selected models

• Installation: Tank / pipeline mounting with suitable holder or flow cell

• Power Supply: 230V AC (or as per model requirement)

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Why Choose Uma Industries Online pH Meter?

• Manufacturer supply from Faridabad, Haryana

• Designed for Indian industrial conditions

• Strong service support and availability of spare electrodes

• Reliable performance for water treatment and process applications

• Assistance for selection, installation & calibration

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Request Price / Quotation

For price, quotation, bulk orders, or technical selection, contact Uma Industries via phmeters.in.
Share your application details (ETP/STP/RO/Process), and we will recommend the best suitable model.

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2) Comparison Table (Website Friendly)

Online vs Portable vs Laboratory pH Meter – Which One is Best?

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Become a Dealer / Buy Digital pH Meter Online

We invite you to join us as a Dealer & Distributor in your city in India.
We also provide doorstep delivery of our Digital pH Meters and related instruments.

📞 Call / WhatsApp: 8178668698

Related Products Page on This website:

1. Digital pH Meter : Online Panel Mounted with 2 point calibration.
2. Online pH Meter : with 0 to 10 volt analog output and 2 point calibration
3. Digital pH Meter : with 0-20 MA output and 2 point calibration
4. Digital pH Meter : with 485 Modbus protocol and 2 point calibration
5. pH Meter Table Top : for Laboratory use and 2 point calibration
6. Sensor / Probe / Electrode for pH Meter / pH Controller

Frequently Asked Questions (FAQ) – Digital Online pH Meter (Uma Industries, Faridabad)

1) What is a Digital Online pH Meter?

A Digital Online pH Meter is a continuous monitoring instrument used to measure the pH value of liquids in real time. It is widely used in water treatment plants, ETP/STP, industrial processes, chemical dosing systems, RO plants, and manufacturing industries where constant pH control is required.

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2) What is the main use of an Online pH Meter?

Online pH meters are used for continuous pH monitoring and control, such as:

• Effluent Treatment Plant (ETP) and Sewage Treatment Plant (STP)

• Neutralization systems with acid/alkali dosing

• Water and wastewater monitoring

• Cooling tower and boiler water treatment

• Chemical industries and process industries

• Food & beverage process monitoring

• Textile, paper, dyeing and electroplating plants

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3) What is the difference between Online pH Meter and Portable pH Meter?

Online pH Meter

• Fixed installation

• Continuous 24×7 monitoring

• Output signals for automation (Relay / 4–20mA / RS485)

Portable pH Meter

• Handheld / movable

• Used for spot checking and sampling

• No permanent installation required

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4) What pH range does this Digital Online pH Meter measure?

Most Online pH meters measure typically:

• pH range: 0.00 to 14.00 pH
  (Exact model specifications may vary. For process-specific requirements, we can suggest the most suitable model.)

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5) How accurate is the Online pH Meter?

Uma Industries Digital Online pH Meters are designed for stable and reliable measurements. Typical performance includes:

• High measurement stability

• Fast response

• Repeatable reading
  Accuracy depends on electrode condition, calibration quality, temperature, and maintenance.

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6) Does it support automatic dosing control?

Yes. Our Online pH Controller models can provide:

• Relay output for acid/alkali dosing pump control

• Adjustable setpoints for automation
  This helps maintain pH in the required range automatically.

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7) What output signals are available?

Depending on the model, output options include:

• Relay output (for dosing pumps / alarms)

• 4–20mA output (for PLC/SCADA systems)

• RS485 / Modbus RTU (in advanced models)

If you want integration with PLC / SCADA, tell us your system requirement and we’ll suggest the best configuration.

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8) What is the required power supply?

Online pH meters commonly operate on:

• 230V AC supply
  Some models may support 24V DC depending on application needs.

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9) Can it be used in harsh industrial environments?

Yes. Uma Industries Online pH meters are developed for industrial use and are suitable for:

• ETP/STP applications

• Continuous operation

• Industrial water treatment and chemical processes
  For high temperature, heavy contamination, or corrosive environments, we recommend choosing the correct electrode type and mounting assembly.

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10) How do I install an Online pH Meter?

Installation generally includes:

1. Mounting the controller/transmitter panel

2. Fixing the pH sensor/electrode in a pipeline or tank using proper holder

3. Connecting signal cable and power

4. Calibrating the instrument using buffer solutions
   We also guide customers for proper mounting to avoid errors due to air bubbles, dry electrode tip, or turbulence.

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11) Can the sensor be installed in a pipeline?

Yes, with the right accessories such as:

• In-line sensor holder

• Flow cell assembly

• Suitable mounting arrangement
  For pipeline installations, a stable and consistent flow gives the best results.

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12) How often do I need to calibrate the Online pH Meter?

Calibration frequency depends on process conditions:

• Normal water applications: once every 7–15 days

• ETP/STP or chemical process: once every 3–7 days

• Heavy contamination or scaling: more frequent calibration may be required
  Regular calibration ensures consistent and accurate readings.

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13) What buffer solutions are used for calibration?

Standard pH buffer solutions:

• pH 4.00

• pH 7.00

• pH 9.20 / pH 10.00 (as required)
  Typically, pH 7 and pH 4 or pH 7 and pH 9.2 are used depending on process range.

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14) Why is my pH reading fluctuating?

Common reasons:

• Electrode tip is dirty or coated

• Air bubbles near sensor

• Loose wiring or damaged cable

• Poor grounding / electrical noise

• Wrong installation (high turbulence)

• Calibration required
  Cleaning the electrode and correct installation usually fixes the issue.

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15) How do I clean the pH electrode?

General cleaning steps:

• Rinse electrode with clean water

• For oily contamination: mild detergent cleaning

• For scaling: use mild acidic cleaning (as recommended)

• Always store electrode in proper storage solution, not dry
  Never scrub the glass bulb aggressively.

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16) What is the electrode life of an Online pH Meter?

Electrode life depends on usage and maintenance:

• Average life: 6 months to 18 months
  Factors affecting electrode life:

• High temperature

• Strong chemicals

• Abrasive media

• Poor cleaning and storage

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17) Can I replace the pH sensor/electrode separately?

Yes. The electrode/sensor is replaceable.
When replacing, ensure:

• Same compatible electrode type

• Correct connector/cable configuration

• Fresh calibration after replacement

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18) Does temperature affect pH measurement?

Yes. pH measurement is temperature dependent.
Some models support temperature compensation (manual/automatic). For best performance in varying temperature processes, temperature compensation is recommended.

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19) Is Online pH Meter suitable for ETP/STP plants?

Yes, it is one of the most common applications. Online pH meters are used to:

• Monitor inlet/outlet pH

• Control neutralization dosing

• Maintain compliance with discharge standards
  Correct sensor mounting and periodic cleaning are essential for stable operation in ETP/STP.

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20) Can this pH meter connect to PLC/SCADA systems?

Yes, models with 4–20mA or RS485 (Modbus RTU) can be connected to PLC/SCADA for monitoring and automation.

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21) What accessories are required with an Online pH Meter?

Common accessories include:

• pH electrode/sensor

• Electrode holder / flow cell

• Cable (standard length or as required)

• Buffer solutions for calibration
  Optional:

• Dosing pump control relay wiring

• 4–20mA/RS485 integration support

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22) How do I choose the right Online pH Meter model?

Selection depends on:

• Tank or pipeline installation

• Process temperature and chemical nature

• Requirement of relay / 4–20mA / RS485 outputs

• Expected contamination level and cleaning frequency
  If you share your application details, we can recommend the most suitable model.

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23) Do you provide service support and spare parts?

Yes. Uma Industries provides:

• Technical guidance for installation and calibration

• Spare electrode supply

• Maintenance assistance
  We ensure reliable after-sales support for industrial users.

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24) Do you manufacture Online pH Meters in India?

Yes. Uma Industries is a manufacturer based in Faridabad, Haryana (India) and supplies Digital Online pH Meters for industrial and water treatment applications across India.

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25) How can I place an order or get a quotation?

You can contact us through phmeters.in for:

• Product selection support

• Pricing and quotation

• Bulk supply and dealer inquiries
  Share your application details (ETP/STP/RO/Process), and we’ll guide you with the correct model.

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• Industrial pH Controller
• Online pH Meter
• Chemical Dosing Pump

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