Digital pH Controller Online from UMA Industries is built for continuous pH monitoring and automatic control of dosing pumps, alarms, solenoid valves and related process equipment. Manufactured at UMA Industries’ unit in Village Sunped, Ballabgarh, Faridabad, Haryana, India, this model is suited to industrial water treatment and process lines that need stable pH control instead of manual checking. UMA Industries supplies and provides technical support to customers across India, and published website prices are company-confirmed. Product size, power supply, wiring interface and accessory selection may be finalized in quotation according to the application, panel design and process requirement.
For buyers comparing online pH control options, Digital pH Controller Online is most useful when the process needs both measurement and control output from the same instrument. It continuously reads the pH value through a compatible pH electrode and acts on the selected set point to drive a relay output. That makes it practical for acid dosing, alkali dosing, neutralisation tank control, alarm signalling and interlock logic in chemical, utility and wastewater systems.
Application areas for Digital pH Controller Online
The strongest demand for Digital pH Controller Online usually comes from effluent and sewage treatment plants, RO water systems, chemical dosing skids and process tanks where pH drift can affect compliance, finish quality or downstream equipment. In ETP and STP service, operators often need a controller that can monitor continuously and switch dosing equipment reliably. In RO pretreatment, stable pH helps support conditioning and chemical management. In electroplating, textile dyeing, pharma utilities and food-related process support, pH control helps maintain repeatable batch conditions.
Because the controller uses dual relay logic, it can be assigned to separate low-pH and high-pH actions. That is helpful when a plant wants one output for alkali dosing and another for acid dosing, or one output for alarm and another for interlock. The same approach is also useful in neutralisation tanks, where process correction is more effective when pH excursions are handled automatically rather than manually.
Industries and plant users
Typical buyers include ETP operators, STP contractors, OEM panel builders, RO plant integrators, chemical dosing skid makers, maintenance teams and process engineers. If your project involves PLC panels, remote monitoring or batch dosing logic, the controller can be selected alongside a compatible probe and wiring arrangement. For related instruments and control variants, you can also review ph Controller Panel Mount, pH Controller 1 Relay and PH Controller 2 Point Calibration 2 Relay Out.
Control logic and operating principle
The working principle of Digital pH Controller Online is straightforward: the instrument reads the pH signal from the electrode, displays the value on the LED screen and compares it to the user-set thresholds. When the process value crosses a limit, the corresponding relay changes state and can start or stop a dosing pump, sound an alarm or act through a control circuit. This is especially useful where manual observation may be too slow for process stability.
How the two set points are used
One set point can be assigned for low pH and the other for high pH. In a typical neutralisation arrangement, low pH may trigger alkali dosing while high pH may trigger acid dosing. In other installations, one relay may be used for alarm and the second for equipment actuation. Since exact control logic depends on the site panel and process design, the wiring scheme should be decided during quotation and commissioning.
For buyers needing communication or alternate control architectures, UMA also supplies RS 485 Modbus RTU ph Controller and digital ph controller india for broader process integration. If you are building a complete dosing system, the PH Controller with Dosing Quantity and delay may also be relevant depending on the project sequence.
Installation guidance for panel mounting
Digital pH Controller Online is a panel-mounted unit meant for clean and dry electrical enclosures. Proper installation improves signal stability, operator visibility and ease of maintenance. The electrode cable should be kept away from high-voltage wiring, VFD leads and motor circuits because electrical noise can disturb the pH signal. The pH electrode should be installed according to the process vessel, sample point or flow arrangement used in the plant.
Before commissioning, verify that the panel cut-out, supply voltage, relay load and cable routing are suitable for the site. The controller should not be installed where acid fumes, water splash or excessive humidity can affect the electronics. If the plant uses a larger control panel, the controller can be paired with other indicators and contactors as part of a full dosing system.
Digital pH Controller Online installation checklist
- Mount in a dry electrical panel with clear front visibility
- Keep probe wiring separate from power and VFD cables
- Check relay loading and use interposing hardware where required
- Confirm the correct electrode type and BNC connection
- Plan dosing line direction before automatic operation
Calibration with buffer solutions
Calibration is essential for reliable operation of Digital pH Controller Online. The supplied product information supports two-point calibration using 4 pH and 7 pH buffer solution. Fresh buffer solution should be used, and the electrode should be rinsed with clean water or DM water between steps. For general pH measurement practice, users may refer to the external guidance in US EPA Method 9040C — pH Electrometric Measurement; this is only general guidance and does not imply product certification.
Practical calibration steps
First, rinse the electrode and immerse it in 7 pH buffer until the reading stabilizes. Then adjust the calibration value so the display reads 7.00 pH. Next, rinse again and place the electrode in 4 pH buffer, wait for stability and adjust the second calibration point to 4.00 pH. Avoid rubbing the glass bulb harshly because the sensing surface is delicate. If readings drift, become slow or look unstable, the electrode should be cleaned, rechecked with fresh buffers and replaced when necessary.
For users expanding their pH control system, compatible accessories and alternate formats can be reviewed at KWAH Dosing Controller and Passivation Dosing Controller. These related pages help project teams compare control logic before final selection.
Electrode care and routine verification
The performance of Digital pH Controller Online depends heavily on the probe condition. A pH electrode should not be stored dry for long periods, and it should be cleaned regularly when the process liquid is dirty, chemical-laden or high in suspended solids. If scale or coating develops on the sensing surface, the response becomes slower and the control action may become less consistent.
Routine verification should include checking the reading against known buffers, confirming stable relay switching and inspecting the connector and cable for moisture or damage. Where the plant operates continuously, a planned cleaning routine is better than waiting for a visible fault. In many facilities, spare electrodes are kept on hand to reduce downtime during maintenance shutdowns.
Safety precautions for industrial use
When using this product, electrical and process safety both matter. The relay output should be wired through proper contactor or interposing relay arrangements when the connected load requires it. The controller should be protected from direct splash, acid fumes and moisture ingress. Operators should confirm chemical line direction, dosing tank level and pump priming before enabling automatic mode. In corrosive environments, good panel sealing and careful cable routing are just as important as calibration.
For plant teams comparing future upgrades, the control architecture can be standardized across sites so that commissioning and operator training remain familiar. This is one reason the product is often preferred in ETP/STP and OEM panel work, where repeatability and ease of service matter.
Faridabad manufacturing, dispatch and pan-India support
this product is manufactured at UMA Industries’ unit in Village Sunped, Ballabgarh, Faridabad, Haryana, India. This Faridabad manufacturing base supports industrial buyers who need practical process instruments with direct technical communication. UMA Industries supplies and provides technical support to customers across India, including project sites, OEM panels, treatment plants and maintenance teams.
Ready-stock compact products, controllers, spares and accessories may be dispatched by air courier within 3 working days, subject to availability, payment confirmation, destination serviceability and carrier schedules. Delivery timelines for complete salt spray chambers and other large equipment are confirmed separately according to model, capacity, packing and freight mode. For this controller, quotation-stage details such as wiring style, accessory matching and any integration needs can be finalized according to the project requirement. The company-confirmed website price helps buyers compare models quickly before requesting the final panel or site configuration.
Selecting the right pH controller for your process
Before ordering this product, buyers should define whether the application needs only local display, dual relay control, communication output or a specific panel format. If the process uses acid and alkali dosing together, the dual-relay arrangement is useful. If the project connects to PLC or SCADA, a communication model may be more convenient. If the panel already has existing hardware, the controller should be matched to the cut-out, wiring and electrode interface used by the plant.
Because product size, power supply, optional accessories and delivery schedule may be finalized in quotation, the commercial discussion should also confirm the site conditions, process liquid type and duty cycle. This helps the selected controller and probe match the real operating environment instead of a generic sample-test assumption. If you need a panel-builder-friendly option, compare the available product family pages and choose the configuration that best fits the control philosophy of the project.
FAQs for this product
What does Digital pH Controller Online do?
this product measures process pH continuously and uses relay outputs to control dosing pumps, alarms or other equipment when the pH crosses the selected set points.
How many control outputs are available?
This model has 2 potential-free relay outputs, which can be used for low-pH and high-pH control logic or for alarm and interlock functions.
How is it calibrated?
It is calibrated using 2-point calibration with 4 pH and 7 pH buffer solution. The electrode is rinsed, immersed in the buffer and the displayed value is adjusted to match the standard.
Can it be used for ETP and STP plants?
Yes, this product is commonly used in ETP, STP, RO plants, neutralisation tanks, chemical dosing systems, textile units, electroplating and process utilities.
Does it control acid and alkali dosing?
Yes. One relay can be assigned to low-pH correction and the other to high-pH correction, depending on the site wiring and control logic.
What care does the pH electrode need?
The electrode should be kept clean, not stored dry for long periods and checked regularly with fresh buffers. Slow or unstable readings usually indicate maintenance or replacement is needed.
Can this controller be used with PLC panels?
It can be used in industrial control panels, and the exact wiring approach should be selected according to the panel design, relay loading and process requirement.
Do you supply outside Faridabad?
Yes. UMA Industries supplies and provides technical support across India, and the dispatch plan depends on availability, payment confirmation, destination serviceability and carrier schedules.
If you are ready to shortlist a controller for your plant, contact UMA Industries for quotation support, electrode matching and panel integration guidance. Digital pH Controller Online is a practical choice for continuous process monitoring, stable dosing and reliable industrial pH control.
Digital pH Controller Online is supplied with the final configuration recorded in the customer quotation or proforma invoice.
Need help choosing? Call/WhatsApp us for industrial pH/ORP solutions.
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