4-20MA Digital pH Meter
4-20MA Digital pH Meter is used to measure the pH value of water, chemical solutions, process liquids and industrial fluids. This digital pH meter provides continuous pH indication with 4-20 mA analog output, making it suitable for PLC, SCADA, data logger, control panel and industrial automation systems.
UMA Instruments supplies reliable Digital 4-20MA Digital ph Meter Output for RO plants, ETP/STP plants, chemical dosing systems, electroplating industries, pharma plants, textile processing, dairy plants, water treatment systems and process industries across India. The instrument is designed for accurate pH measurement, easy calibration and stable performance in industrial environments.
Technical Specifications: Digital pH Meter with 4-20MA Output | 4-20MA Digital ph Meter
- Range: 0.00 to 14.00 pH
- Resolution: 0.01 pH
- Calibration: Front panel screw calibration for 4 pH and 7 pH buffer solution
- Input: pH probe / electrode with standard BNC connector
- Output: 4-20 mA analog output for PLC / SCADA / recorder connection
- Display: Seven-segment bright LED display
- Operating Voltage: 220 VAC
- Panel Size: 96 mm × 96 mm × 85 mm
- Body: PP / ABS enclosure
- Application: Water, chemical solution, RO, ETP, STP and process liquid pH monitoring
- Mounting: Panel mounted online type
What is 4-20 mA Output in pH Meter?
The 4-20 mA output is an industrial analog signal used to transmit the measured pH value to external devices such as PLC, SCADA, chart recorder, data logger or remote display. In many industrial plants, 4-20 mA signal is preferred because it is stable, reliable and suitable for long-distance signal transmission compared to low-voltage signals.
In a 4-20MA Digital pH Meter, the pH value measured by the electrode is converted into a proportional analog current signal. This output can be used by automation systems to monitor pH value, record process data or generate alarms according to process requirements.
Why Choose Our 4-20MA Digital pH Meter?
- Accurate pH measurement from 0.00 to 14.00 pH
- 4-20 mA analog output for PLC, SCADA and data logging
- Bright LED display for easy reading
- Front panel 2-point calibration using 4 pH and 7 pH buffer solution
- Compatible with standard pH electrode with BNC connector
- Suitable for panel mounting in industrial control panels
- Useful for continuous online pH monitoring
- Reliable for water treatment, chemical dosing and process automation
Applications of 4-20MA Digital pH Meter
Water Treatment Plants | 4-20MA Digital ph Meter
4-20MA Digital pH Meter is used in water treatment systems for continuous pH monitoring and signal transmission to PLC or control panels. It helps maintain proper water quality and dosing control.
RO Plants
In RO plants, pH measurement is required for feed water, treated water and chemical dosing systems. The 4-20 mA output helps connect the pH meter with automation systems.
ETP and STP Plants
Effluent treatment plants and sewage treatment plants require continuous pH monitoring before discharge. A 4-20MA pH meter helps record and monitor the process value accurately.
Chemical Industries
Chemical industries use digital pH meters with analog output for reaction monitoring, neutralization, acid/alkali dosing and process control.
Electroplating Industries
Electroplating and surface treatment plants require controlled pH levels for bath stability and better finish quality. 4-20 mA output can be used for process monitoring and alarms.
Textile and Dyeing Plants
Textile processing and dyeing units use pH meters for chemical bath monitoring, washing processes and quality control.
Pharmaceutical and Laboratory Process
Pharma plants and process laboratories use pH measurement for solution preparation, quality checking and batch process monitoring.
Food, Dairy and Beverage Plants
pH measurement is useful in dairy, beverage and food processing applications where process quality and consistency are important.
Types of pH Meters We Supply
We manufacture and supply different types of pH meters and pH controllers for industrial and laboratory applications. You can select the correct model according to output requirement, installation type and process application.
- Digital pH Meter Online – Panel mounted online pH meter with 2-point calibration.
- Digital pH Meter with 0-10 VDC Output – Suitable for PLC and signal monitoring systems.
- Digital pH Meter with 4-20 mA Output – Industrial analog output pH meter for process control.
- Digital pH Meter with RS485 Modbus – Suitable for SCADA, PLC and digital communication applications.
- Table Top pH Meter – Suitable for laboratory and sample testing.
- pH Sensor / Probe / Electrode – Replacement sensor for pH meter and pH controller.
To view more models, visit our pH Meter product category.
pH Controller Distributor and Supplier
Along with 4-20MA Digital pH Meter, we also supply online pH controllers for automatic control applications. A pH controller is used where relay output, dosing pump control, alarm output, solenoid valve operation or automatic chemical dosing is required.
- pH Controller with 1 Relay – 2-point calibration, 1 set point and single relay output.
- pH Controller Modbus RTU RS485 – Suitable for Modbus communication and automation systems.
- pH Controller with 2 Relay Output – 2 set points and 2 relay outputs for industrial control.
- Digital pH Controller Online – Online pH controller with auto calibration and relay output.
- pH Controller with Dosing Quantity and Delay – Suitable for dosing quantity and analysis time settings.
To view controller models, visit our pH Controller product category.
Calibration Process for 4-20MA Digital pH Meter
Calibration with 7 pH Buffer Solution
- Clean the pH electrode with clean water.
- Dip the electrode in standard 7 pH buffer solution.
- Wait for the display reading to become stable.
- Rotate the 7 pH calibration screw slowly.
- Set the display value to 7.00 pH.
Calibration with 4 pH Buffer Solution
- Wash the electrode again with clean water.
- Dip the electrode in standard 4 pH buffer solution.
- Wait until the reading becomes stable.
- Rotate the 4 pH calibration screw slowly.
- Set the display value to 4.00 pH.
For accurate measurement, always use fresh buffer solution and clean the pH electrode before calibration. Do not rub the glass bulb harshly because it may damage the sensitive surface of the electrode.
Work Instructions and User Precautions
- Install the 4-20MA Digital pH Meter in a clean and dry control panel.
- Use a suitable pH electrode according to the process liquid.
- Do not keep the pH electrode dry for a long time.
- Clean the electrode regularly in dirty water, chemical solution or effluent.
- Keep the pH signal cable away from high voltage wiring and motor cables.
- Use standard 4 pH and 7 pH buffer solution for calibration.
- Check 4-20 mA wiring polarity before connecting to PLC or SCADA.
- Use shielded cable for analog signal wiring wherever required.
- Protect the instrument from water splash, acid fumes and excessive humidity.
- Replace the electrode if readings become slow, unstable or incorrect.
Benefits of 4-20MA Digital pH Meter
A 4-20MA Digital pH Meter helps industries monitor pH value locally and also transmit the signal to remote control systems. It is useful for process automation, quality monitoring, dosing control and plant data recording. This instrument reduces manual checking and improves process reliability.
- Continuous pH display and analog output
- Easy integration with PLC, SCADA and data logger
- Better control of acidic and alkaline solutions
- Reduced manual pH testing work
- Improved chemical dosing control
- Useful for industrial automation and quality checking
- Simple operation and easy calibration
Supply Areas for 4-20MA Digital pH Meter
We supply 4-20MA Digital pH Meter, online pH meter, pH controller and pH electrode across India. Our products are commonly used in industrial areas, chemical zones, water treatment plants and process industries.
We can supply pH meters to major industrial cities and towns including Ahmedabad, Naroda GIDC, Vatva GIDC, Odhav, Kathwada, Sanand, Changodar, Bavla, Gandhinagar, Kalol, Kadi, Mehsana, Vadodara, Bharuch, Ankleshwar, Surat, Vapi, Rajkot, Faridabad, Delhi NCR, Noida, Gurugram, Ghaziabad, Jaipur, Pune, Mumbai, Chennai, Bengaluru and Hyderabad.
FAQs: 4-20MA Digital pH Meter
What is a 4-20MA Digital pH Meter?
A 4-20MA Digital pH Meter is an online pH measuring instrument that displays pH value and provides 4-20 mA analog output for PLC, SCADA, recorder or automation systems.
What is the range of this pH meter?
The standard measuring range is 0.00 to 14.00 pH with 0.01 pH resolution.
Where is 4-20MA Digital pH Meter used?
It is used in RO plants, ETP plants, STP plants, chemical industries, electroplating, textile plants, pharma, food processing and water treatment applications.
Why is 4-20 mA output used?
4-20 mA output is used for reliable analog signal transmission to PLC, SCADA, data logger or remote display systems. It is widely used in industrial automation.
Can this pH meter connect to PLC?
Yes, the 4-20 mA output can be connected to PLC analog input, depending on PLC input specification and wiring requirement.
Can this pH meter connect to SCADA?
Yes, it can be connected to SCADA through PLC or analog input module for pH monitoring and data logging.
How is the pH meter calibrated?
The pH meter is calibrated using 7 pH and 4 pH standard buffer solutions through front panel calibration screws.
Do you supply pH electrode also?
Yes, we supply pH electrodes, probes and sensors suitable for digital pH meters, online pH meters and pH controllers.
Is pH controller also available?
Yes, pH controllers are available with 1 relay, 2 relay, dosing delay, 4-20 mA output, 0-10 VDC output and RS485 Modbus options.
Do you supply 4-20MA Digital pH Meter across India?
Yes, we supply 4-20MA Digital pH Meter, pH controller and pH electrode across India with dispatch support and technical guidance.
Business Partner / Dealer Opportunity
Join us as a business partner, dealer, distributor or stockist in your city. If you are interested in pH meters, pH controllers, sensors and industrial instruments, you can send your proposal to us. Your efforts will be highly appreciated.
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- phmeters.in – pH meters, pH controllers, sensors and industrial instruments.
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Useful Reference
For basic understanding of pH measurement, you may also read this external reference: pH value information.
Contact us for 4-20MA Digital pH Meter, Digital pH Meter with 4-20MA Output, pH Controller, pH Sensor and industrial pH measurement solutions.
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