The Labmart OPH11 Online pH Controller is designed for continuous pH monitoring and control applications requiring reliable measurement, automatic temperature compensation and industrial signal output. It measures pH from -1.00 to 15.00 pH with 0.01 pH resolution and ±0.01 pH accuracy, with selectable USA or NIST buffer systems. The controller also provides 4–20 mA output, RS485 communication, configurable high/low alarms and automatic electrode diagnosis.

Suitable for laboratory, water-quality, process-monitoring and industrial applications where continuous online pH measurement is required.

Product Overview

The Labmart OPH11 Online pH Controller is a panel-style digital pH monitoring system intended for continuous online measurement. It combines a digital controller with an online pH electrode supplied with a 5 m cable.

The OPH11 supports a pH measurement range of -1.00 to 15.00 pH, with 0.01 pH resolution and ±0.01 pH accuracy. Temperature can be measured from 0 to 100°C, while automatic temperature compensation helps maintain measurement accuracy across the specified temperature range.

The controller supports 1- to 3-point calibration with automatic buffer recognition and allows selection between USA and NIST buffer sets. Configurable alarm limits, hysteresis and 4–20 mA output make it suitable for integration into monitoring and process-control systems.

Key Features and Benefits

• Wide pH measurement range: Measures from -1.00 to 15.00 pH, supporting a broad range of aqueous process and laboratory applications.
• 0.01 pH resolution: Provides fine measurement resolution for monitoring changes in pH.
• ±0.01 pH accuracy: Designed for precise online pH monitoring.
• 1–3 point calibration: Flexible calibration with automatic buffer recognition simplifies routine calibration.
• USA or NIST buffer selection: Allows the user to select the applicable buffer standard.
• Automatic temperature compensation: Compensates automatically across 0–100°C to support temperature-variable measurement conditions.
• Automatic electrode diagnosis: Helps users determine when sensor replacement may be required.
• 4–20 mA signal output: Facilitates connection with compatible process monitoring and control systems.
• RS485 communication: Provides a digital communication interface for compatible systems.
• Configurable high/low alarms: Alarm limits can be selected from 0.00 to 14.00 pH.
• Factory reset function: Allows settings to be returned to factory defaults when required.

4. Technical Specifications

The specifications above are taken from the OPH11 specification table and product information in the supplied catalogue.

5. Applications

The Labmart OPH11 can be used for online pH monitoring in applications such as:

• Water quality monitoring
• Wastewater treatment processes
• Process water monitoring
• Industrial water treatment
• Chemical process monitoring
• Laboratory process monitoring
• pH monitoring in tanks and vessels
• Continuous aqueous process monitoring
• Research and development applications
• Quality-control monitoring

Specific application suitability depends on the process conditions and electrode requirements.

6. Suitable For

• Industrial laboratories
• Water-treatment facilities
• Wastewater-treatment facilities
• Chemical processing facilities
• Quality-control laboratories
• Research laboratories
• Process monitoring teams
• Environmental monitoring applications
• Engineering and instrumentation teams
• Educational and technical laboratories

7. FAQs

1. What is the Labmart OPH11?

The OPH11 is an online pH controller designed for continuous pH monitoring using an online pH electrode.

2. What is the pH range of the OPH11?

The OPH11 measures from -1.00 to 15.00 pH.

3. What is the pH resolution?

The pH resolution is 0.01 pH.

4. What is the accuracy of the OPH11?

The specified pH accuracy is ±0.01 pH.

5. Does the OPH11 provide automatic temperature compensation?

Yes. Automatic temperature compensation is specified across 0–100°C.

6. How many calibration points are supported?

The controller supports 1 to 3 point calibration with automatic buffer recognition.

7. Which pH buffer standards can be selected?

The controller supports either USA buffers: 4.01 / 7.00 / 10.01 or NIST buffers: 4.01 / 6.86 / 9.18.

8. Does the OPH11 have a 4–20 mA output?

Yes. The OPH11 provides a 4–20 mA signal output.

9. Does it support RS485 communication?

Yes. An RS485 communication interface is specified.

10. What type of alarm functionality is available?

The controller provides selectable low/high pH alarm limits from 0.00 to 14.00 pH.

11. What electrode cable is supplied?

The standard accessories include an online pH electrode with a 5-metre cable.

12. What power supply does the OPH11 require?

The specified power requirement is DC 24 V.