Residual ranges
Free chlorine 0–10 ppm; monochloramine 0–5 ppm. Agree the operating mode and separate reference methods.
Halogen MP6
Black self-cleaning monitoring for monochloramine and free chlorine in suitable chloraminated water.
Keep monochloramine and free chlorine distinct.
MP6 is the black Halogen sensor for monochloramine and free-chlorine measurement in suitable chloraminated water. Its operating modes and reference calibration help the team work with the residual actually used by the process.
Review pH, ORP, conductivity and temperature alongside the disinfectant readings. These supporting measurements provide context; they do not identify every cause of a change on their own.
Cleaning built into the measurement
A 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.
Built for demanding water conditions
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.
These photographs show the MP5 trial and the shared self-cleaning principle.
Discuss your application
MP6 operating envelope
Model-specific values from the supplied MP6 guide. They differ from MP5 and from other Halogen sensor families.
Measurement interval
Nominal 120-second interval in the specification. Mono-only configuration has a different cycle described in the guide.
Water chemistry
Chlorine sample pH 7.5–9.0 and conductivity 150–2,000 µS. Review suitability across your expected operating conditions.
Sample conditions
5–55°C sample temperature; published pressure limit 10 bar, subject to the mounting and installation rating.
Power and integration
24 V DC ±10%; 50 mA operating with 200 mA maximum startup. Connect through a compatible controller or reviewed PLC arrangement.
Calibration and care
Typical six-month calibration stability, with calibration checks at least every six months and care directed by the model guide.
Connect the residual to an investigation record
Record which residual is being measured, the configured mode and the location represented. Compare each channel with the corresponding reference method rather than treating all chlorine tests as equivalent.
A change in monochloramine may need investigation alongside free chlorine, pH, temperature and separate nitrogen measurements. MP6 does not measure nitrate or nitrite.
Downloads for your technical review
Read the manufacturer product guides for installation, operation, calibration and model-specific limits.
MP5 and D20 product guide
The supplied MP5 guide uses the MP5A model designation. PMA presents this model as MP5.
MP6 and D20 product guide
Operating modes, reference calibration, installation requirements and technical specifications.
Your questions, answered
Is MP6 the same model as MP Total?
No. This page follows the supplied MP6 guide for free-chlorine and monochloramine monitoring. Do not transfer its specification to MP Total; PMA will confirm the exact model for your application.
Can both residuals be calibrated?
The guide describes reference calibration for monochloramine and free chlorine, including a procedure for treated water containing both. Follow the stated mode and reference-method instructions.
How does D20 fit into the system?
D20 displays the configured sensor readings and provides local setup, records and site interfaces. PMA will confirm firmware compatibility, loading and the outputs needed by your operators.
Does MP6 need analytical reagents?
The reagentless measurement does not need analytical reagents, a sensing membrane or electrolyte. It still requires the reference checks and maintenance specified for the supplied sensor.
How is the sensing end kept clean?
The impeller circulates water and agitates cleaning beads across the measuring surfaces. Electrochemical cleaning supports the mechanical action; this does not remove the need for inspection and servicing.
What should PMA review for my site?
Share the expected free-chlorine and monochloramine residuals, water chemistry, temperature and pressure, monitoring location, power and required site signals. PMA can then review the model and installation together.
Looking after your world since 1971
PMA connects the measurement, installation and operating team. We help you review the application, select suitable instrumentation and plan commissioning, training and ongoing service.
Build your system
Start with your water chemistry. Choose the installation and connections, then see how your sensor and controller work together.
Self-cleaning. Reagentless.
Choose a sensor to begin
Find the right fit for your water.
Tell us about your disinfectant, water chemistry and installation. PMA can help you work through the sensor, controller and integration requirements.
Start a conversation.
01484 843 708sales@pma.uk.comBrook Mills House, Carr Lane
Slaithwaite, Huddersfield, HD7 5BG