Built for continuous process monitoring
Compact industrial pH/ORP controller with two isolated 4–20mA outputs, Pt1000 or NTC10K temperature compensation, and panel, wall or pipe mounting.
Key specifications
| Measurement Range | -2.00 to 16.00 pH / -2000 to 2000 mV |
| Accuracy | ±0.01 pH / ±1 mV |
| Output | 4-20mA |
Need help confirming the right controller and sensor?
Not sure which controller and sensor fit your process? Send us the liquid, measuring range, temperature, installation method, required output and quantity. We will review the configuration before quotation.
Product Overview
How to Select the Right Configuration
Choose PH-303 when the project needs the documented measurement range, Pt1000 or NTC10K temperature compensation, two isolated 4–20mA outputs and the listed installation options. Choose PH-302 when the project also requires RS485 Modbus RTU or two relay controls. Choose PHS-3301 when a larger controller platform with documented Modbus and additional control functions is required.
Key Functions and Benefits
Key Functions
pH, ORP and temperature measurement
PH-303 supports pH or ORP measurement with temperature input. The documented resolution is 0.01 pH and 1 mV, with temperature compensation using Pt1000 or NTC10K.
Two isolated analogue outputs
The selection guide documents two isolated 4–20mA outputs. Confirm the required value mapping, load and receiving-device configuration before wiring the controller into a PLC, recorder or other system.
Simplified integration
PH-303 does not include the PH-302 relay outputs or RS485 Modbus RTU communication. Choose the PH-302 when relay control or digital communication is required.
Verified Technical Specifications
Verified Technical Specifications
Sensor, Range and Compatibility
Continuous pH, ORP and temperature measurement with dual analogue outputs
Tenber PH-303 is a compact industrial pH/ORP controller for continuous measurement in wastewater, environmental monitoring, process water and other suitable applications. It measures pH or oxidation-reduction potential together with temperature and provides two isolated 4–20mA outputs for compatible monitoring, recording or automation systems.
PH-303 uses the same core measurement range as the PH-302 family while omitting the PH-302 relay and RS485 Modbus RTU functions. This simplified configuration is intended for projects that need analogue signals without those additional control and communication features.
Electrode and Temperature-Compensation Selection
PH-303 should be selected together with the pH or ORP electrode, temperature probe, cable and installation arrangement. The nominal pH range does not by itself establish whether an electrode is suitable for the liquid.
Before quotation, send the liquid composition, expected pH or ORP range, normal and maximum temperature, pressure, installation position, cable length and required analogue-output mapping. For general industrial pH monitoring, compare TB84H0; for selected fluoride-containing applications, review TB84H7W; for ORP measurement, review TB84R1.
Industrial pH Meter with 4–20mA Output
PH-303 is suited to projects comparing industrial pH meters with 4–20mA output when the system needs two isolated analogue signals, pH or ORP measurement and temperature compensation. Confirm the output mapping, load, electrode, temperature probe and receiving PLC or recorder before quotation.
PH-303 Selection Table
| Project requirement | PH-303 fit | Confirm before quotation |
|---|---|---|
| Measured value | pH or ORP plus temperature | Active measurement mode and matching electrode |
| Analogue integration | Two isolated 4–20mA outputs | Value mapping, load and receiving PLC/recorder input |
| Temperature compensation | Pt1000 or NTC10K | Probe type and wiring for the selected configuration |
| Installation | Panel, wall or pipe mounting | Mounting method, panel opening and maintenance access |
| Digital or relay control | Not included on PH-303 | Review PH-302 or another documented model if RS485 or relay functions are required |
Use the pH/ORP controller range as the controller hub, compare the sensor and electrode range, and read the industrial wastewater pH electrode guide before sending an application.
Compatible Sensor Options
Select the sensor according to the liquid, range, temperature, pressure and installation method. Tenber will confirm the final controller, connector and temperature-compensation configuration before quotation.
Typical Applications
Typical Applications
Wastewater Neutralization
Monitor pH or ORP during treatment and discharge processes after the electrode is matched to the liquid.
Environmental and Process Water
Transmit continuous pH, ORP or temperature values to compatible analogue-input equipment.
Industrial Process Monitoring
Use the simplified analogue-output configuration where relay control and RS485 communication are not required.
Installation, Commissioning and Maintenance
Installation and Wiring Considerations
The selection guide lists panel, wall and pipe installation for this 96-series controller. For panel mounting, confirm the available 92.5 × 92.5mm opening and the mounting hardware supplied with the selected configuration.
Complete the electrode, temperature, two 4–20mA and power wiring checks before applying power. PH-303 does not provide the PH-302 RS485 or relay terminals, so the control system must receive the measurement through the documented analogue outputs. Confirm terminal assignments and output mapping against the current supplied documentation before commissioning.
Commissioning, Calibration and Maintenance
- Confirm the PH-303 model, electrode type, temperature probe, cable and mounting arrangement.
- Check the liquid, measurement range, temperature, pressure and installation point before applying power.
- Complete the supply, electrode, temperature and analogue-output wiring checks.
- Follow the current supplied documentation for pH or ORP calibration and temperature-compensation setup.
- Compare the displayed value with a suitable reference check before connecting the analogue outputs to the control system.
- Record calibration checks and cleaning observations so the maintenance interval reflects actual fouling and drift.
Frequently Asked Questions
Frequently Asked Questions
Can PH-303 measure both pH and ORP?
The selection guide identifies pH and ORP measurement ranges for the PH-302/303 family. Confirm the active measurement mode and electrode configuration before ordering.
Does PH-303 support RS485 Modbus RTU?
No. The supplied selection guide marks RS485 Modbus RTU as a PH-302 function. Choose PH-302 or another documented Modbus model when digital communication is required.
Does PH-303 have relay outputs?
No. The two relay outputs are marked as PH-302 functions in the supplied selection guide. PH-303 is the simplified analogue-output configuration.
Can PH-303 connect to a PLC?
It can be considered when the PLC has compatible analogue inputs for the two isolated 4–20mA outputs. Confirm output mapping, load and wiring before ordering.
Which electrode should I choose?
Send the liquid composition, pH or ORP range, temperature, pressure, mounting method, cable length and maintenance conditions. The controller and electrode should be checked as one configuration.
What should be included in a quotation request?
Provide the measurement parameter, liquid, range, temperature, pressure, installation, required analogue outputs, quantity and destination country.
Compare the pH and ORP controller range, review wastewater pH monitoring, or browse all Tenber instruments.
Manuals, Related Products and Request for Quotation
Confirm the PH-303 measuring configuration
Send the liquid, pH or ORP range, temperature, installation and analogue-output requirements. Tenber will check the controller and electrode combination before quotation.
From controller to complete measuring loop
Review the category, application conditions, selection guidance and compatible sensor before requesting a project quotation.
Related category
Application pages
Selection guides
Matching sensors
Project inquiry
Selection flow for PH-303
Start with pH, ORP or temperature measurement, then check the complete measuring loop before quotation.
- Define the application and liquid composition.
- Record the normal and maximum value, temperature, pressure and flow conditions.
- Choose the sensor or electrode, installation method, cable and maintenance access together with the controller.
- Confirm the receiving system, including 4–20mA, RS485 Modbus RTU, relay, recorder, PLC or DCS requirements.
- Send the quantity, destination country and current documentation requirement for model review.
Application boundaries
Use only when the documented two isolated 4–20mA outputs and the selected electrode and temperature arrangement meet the project requirement. Do not assume RS485 or relay functions.
Inquiry checklist
Include the liquid, parameter and range, temperature, pressure, installation, sensor or electrode, cable length, output or communication interface, control requirement, quantity and destination country.