Meet MP5, MP Total, MP6 and D20: reagentless monitoring, continuous self-cleaning and practical support from PMA.
Halogen brings reagentless chlorine monitoring into the PMA family. MP5, MP Total and MP6 combine an electrochemical measurement with cleaning that happens inside the sensor, rather than relying on frequent manual cleaning of the sensing surfaces.
Pair the appropriate sensor with the D20 controller for local readings, configuration, alarms and integration with your site. PMA helps bring the water chemistry, installation and operating workflow together.
NSF/ANSI/CANHalogen’s October 2026 documentation supports assessment of MP5, MP6 and MP Total for cold drinking-water contact under Regulation 31(4)(b). Explore the test report information, direct monitoring and the information available to operators.
Reagentless measurement, continuous self-cleaning and connected control bring the sensor, controller and site interfaces together around your monitoring point.
No chlorine-analysis reagents, sensing membrane or electrolyte to replenish.
A powered impeller moves cleaning beads across the sensing surfaces.
Choose MP5, MP Total or MP6, then configure the D20 and site interfaces around the monitoring point.
Choose the sensor for your water chemistry, then connect it to a controller and installation that suit the site.
The blue self-cleaning sensor for free-chlorine measurement, with supporting water-quality information.
Explore MP5
Follow the total-chlorine residual, including free and combined chlorine, with self-cleaning measurement.
Explore MP TotalThe black sensor for monochloramine and free-chlorine measurement in suitable chloraminated water.
Explore MP6
A colour display, configuration, analogue outputs, alarms and Modbus RTU connection for the monitoring system.
Explore D20A small motor drives a magnetically coupled impeller. Its movement circulates water at the sensing end and agitates cleaning beads across the measuring surfaces.
The beads help keep the electrodes and pH element clean while the sensor works. Electrochemical cleaning supports the mechanical action. There are no analysis reagents to replenish and no sensing membrane or electrolyte to replace.
This local movement supports measurement at low bulk-flow velocities. The sensor still needs representative water, a suitable installation and planned reference checks.
Iron-rich water can leave heavy deposits on a sensor. Halogen’s continuous self-cleaning helps keep the measuring surfaces working, reducing routine cleaning in challenging conditions.
These photographs show an MP5 after five months in high-iron borehole water, without cleaning, recalibration or other intervention during the published trial.
Discuss your application
The cutaway explains the mechanism; use the product guide for service procedures and the correct replacement parts.
PMA has launched a dedicated chlorine monitoring website. Explore Halogen sensors, compare installation options and build a brief for your monitoring point.
A side-stream flow cell can bring a defined sample to the sensor. Suitable in-pipe and immersion arrangements are also possible with the correct sensor variant and mounting accessories.
Agree pressure, water temperature, pH, conductivity, safe removal access and cable routing before ordering. Keep the sensing end wet and exposed to water that represents the process question.
For a vertical flow cell, the manufacturer arrangement takes water in at the bottom and out at the top so air can rise and leave.
The D20 supports local display, SD-card records, analogue outputs, relay functions and Modbus RTU integration. Match the signal route to your control-room and investigation needs.
Halogen phone-app and remote-access capabilities can support compatible connected installations. PMA will confirm the interface hardware, network, access and data arrangement for your configuration.
A phone screen or remote portal does not replace commissioning, a documented reference check or responsibility for acting on an alarm.
Practical guidance for choosing the monitoring point and using the resulting trend.
Follow a defined treated-water point, reference checks and signal quality.
Connect residual trends to inlet, outlet and storage operating conditions.
Keep monochloramine and free-chlorine trends in a clear investigation record.
Read the manufacturer product guides for installation, operation, calibration and model-specific limits.
The supplied MP5 guide uses the MP5A model designation. PMA presents this model as MP5.
Operating modes, reference calibration, installation requirements and technical specifications.
Start with your water chemistry. Choose the installation and connections, then see how your sensor and controller work together.
The supplied guides describe typical six-month calibration stability and require calibration checks at least every six months. Cleaning reduces routine attention, but the water, duty and installation determine your inspection and service plan.
No. Plan reference checks, inspection and replacement of wear parts or cleaning beads as directed in the model guide. Keep access to the sensor and controller practical.
The product guides describe two sensor Modbus connections on D20. PMA will confirm the supported sensor combination, firmware, power loading and output configuration for your system.
PMA connects the measurement, installation and operating team. We help you review the application, select suitable instrumentation and plan commissioning, training and ongoing service.
Speak to the PMA team about your instruments, reagents or service requirements. Tell us what you need, and we’ll help you find the right next step.
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