Measure at the source.
Install MP5 Free or MP-Total with the sealed immersion assembly and a suitable pole or suspension mount. The impeller supplies local flow, including in still water.
No external sample circuit.POTABLE WATER / ROOFTOP TANKS / RESERVOIRSIn-tank chlorine.
In-tank chlorine.
Less to install.
Less to maintain.
Simplify water-quality monitoring at every building. Halogen measures directly in the tank, using its own impeller to create sample flow. No external sample pump. No drain or return loop. MP5 Free delivers five water-quality measurements from one probe.
No external sample pump MP5 Free: 5 measurements NSF/ANSI 61 drinking-water contact
Do I need a pump to monitor chlorine in a rooftop or storage tank?
No external sample pump is needed with Halogen’s immersion configuration. Install the sealed MP5 Free or MP-Total sensor directly in the tank. Its integrated impeller creates the flow needed at the sensing surface—even when the surrounding water is still. Connect power and signal wiring to your selected controller or compatible telemetry unit. The water stays in the tank: no sample tubing to an analyzer, no drain and no return loop.
DIRECTLY INTO THE RESERVOIRLower the sensor.
Lower the sensor.
Measure right in the water.
A supported immersion sensor puts the measurement directly inside the reservoir. Connect power and signal to your controller or telemetry system. There is no external sample pump, drain or return loop to install.
UP CLOSE / INSIDE THE TANK
The sensor goes to the water.
The suspension supports the sensor below the water surface and clear of the tank floor. The integrated impeller moves the surrounding water across the sensing surface.
No external sample pump. No sample line to an analyzer. No water sent to a drain.
See the actual mounting hardwareA CLOSER LOOK / IMMERSION MOUNTING
Big tank. Simple solution.
Measure directly in your tank or reservoir—with no external sample pump, drain, or return line.
From the mount to the sensor.
MP-Total shown with cable and suspension hardware. The sensor measures directly in the surrounding water.
Explore MP-Total →
MP5 Free
A closer look at the suspension bracket and cable entry on the free chlorine model.
View mounting detail ↗
MP-Total
The mounting detail on the total chlorine model, shown at close range.
View mounting detail ↗Product renders show mounting details; final configuration follows the installation guide. Open any image for a larger view.
THE COMPLETE MONITORING POINTOne immersed sensor.
One immersed sensor.
A simpler system around it.
For rooftop potable-water tanks, building storage and distributed tank networks, the advantage is practical: less equipment to install at each location and fewer sampling components to maintain across the estate.
Connect to your telemetry.
Use MP5 Free’s Modbus RTU over RS-485 connection with a compatible third-party telemetry unit or a Halogen controller. Plan the power supply and protected cable route.
Keep your chosen monitoring platform.Turn readings into action.
Your integrator connects readings and diagnostics to your dashboard, trends and alarm workflow. Define who responds when a tank needs attention.
Repeat a consistent installation.Halogen supplies the sensor technology. Telemetry, network connectivity, dashboards and project integration are selected and commissioned as part of your system.
Measure the water
where it is stored.
Direct immersion brings chlorine monitoring into the tank, without an external sample pump or return loop.
Representative water-storage setting. Image color adjusted.MP5 FREE / FIVE PARAMETERS, ONE PROBESee more of the water.
See more of the water.
Install fewer separate probes.
Measure the chlorine residual and the water conditions around it from the same monitoring point. MP5 Free combines these five measurements in one self-cleaning sensor.
View MP5 Free specifications- Free chlorineTrack the disinfectant residual directly.
- pHUnderstand a key condition for chlorine measurement.
- ORPAdd oxidation-reduction context alongside chlorine.
- ConductivityTrack changes in the water’s ionic content.
- TemperatureSee the actual water temperature at the monitoring point.
HOW DIRECT IMMERSION WORKSThe flow comes
The flow comes
from the sensor.
An electrochemical chlorine sensor needs water moving across its sensing surface. Halogen’s integrated impeller provides that local movement while the sensor is immersed. The measurement happens at the monitoring point, even when the tank has little bulk water movement.
- 01
Position the sensor in the water
Install the sealed assembly at a representative point, below the minimum operating water level.
- 02
Create flow at the sensing surface
The spinning impeller moves surrounding water across the sensing surface, right inside the tank.
- 03
Send measurements to your controller
Connect power and signal wiring to the selected controller or monitoring system for readings and alarms.
The impeller provides local sample flow. It is not a tank mixer; placement still matters when water quality varies with depth or location.
POWER + SIGNALTo controller
Water stays in the tank
HALOGEN
↻Local sample flowCreated by the impeller
TANK / RESERVOIRWHY DIRECT IMMERSION IS A BETTER FITLess equipment at each tank.
Less equipment at each tank.
Less work across every site.
For building owners, operators and system integrators, every extra sampling component becomes another installation and service task. Direct immersion removes the external sample pump, sample tubing and drain or return circuit. Halogen’s reagent-free, membrane-free measurement and SensiCLENE self-cleaning further simplify routine care. Keep the sensor’s calibration and wear-part service plan; remove the work that comes with an external sampling system.
Remove the pump and plumbing
No external sample pump to install or service. No sample tubing, drain connection or engineered sample-return circuit.
No continuous sample waste
Measure the stored water without sending a continuous analyzer sample stream down the drain.
Consolidate the monitoring point
MP5 Free measures chlorine, pH, ORP, conductivity and temperature in one probe, simplifying a multiparameter tank installation.
Reduce routine service tasks
No reagent replenishment or membrane replacement. SensiCLENE mechanically cleans the electrodes while you retain scheduled calibration and wear-part care.
INSTALLATION COMPARISON
What changes when you measure in the tank?
A pumped sample-loop installation moves water through tubing to an external analyzer. Direct immersion removes that transport step. The water stays in the tank, with no continuous sample discharge and no sample-return plumbing to design.
| Consideration | External sample loop | Halogen direct immersion |
|---|---|---|
| Sample movement | An external pump or available pressure carries water to the analyzer. | The integrated impeller moves water across the immersed sensor. |
| Plumbing | Sample tubing plus a drain or an engineered return connection. | No external sample transport, drain or return loop. |
| Water use | A drain arrangement continuously discharges the sample stream. | The water remains in the tank. |
| Measurement location | At the analyzer, after transport through the sample line. | At the selected monitoring point inside the tank. |
| Service planning | Maintain the sensor and the external sample-delivery system. | Plan access to the sensor, mounting, cable and connected equipment. |
Compare the installed system and the service plan.
A probe price alone leaves out the sample pump, tubing, installation labor, drain or return work, consumables and repeat service visits. Compare the complete monitoring point over the same operating period. With direct immersion, the external sampling system drops out of that calculation.
Across a building portfolio or municipal tank program, every avoided pump and plumbing connection is one less component to install, inspect and replace.
Request a system-level comparisonTWO MEASUREMENT OPTIONSYour residual.
Your residual.
Your immersion sensor.
Use the same direct-in-tank approach for free or total chlorine. Select the sensor for your disinfectant and water conditions.
IP68 sealed immersion assembly. Confirm installation depth, immersion duration and cable configuration with Halogen. Model-specific measurement specifications still apply.
MP5 Free
For monitoring free chlorine residual in chlorinated water. Also listed as MP-5F in the product catalog.
Explore MP5 FreeMP-Total
For total chlorine and monochloramine monitoring, including chloraminated water applications.
Explore MP-TotalImmersion data sheetMP5 Free & MP-Total · PDF · Draft 01
POTABLE-WATER PROJECTS / UAE & BEYOND
Make the approval package as clear as the installation.
For rooftop and building-tank projects in Dubai, Abu Dhabi and other markets, drinking-water contact documentation is an important part of sensor selection. Halogen MP sensors are certified to NSF/ANSI 61 for drinking-water contact.
Request the certificate and confirm its scope for the selected sensor, cable and wetted mounting components. Project acceptance remains with the relevant authority; assemble the evidence for the exact configuration being specified.
Review certifications & documentation
Keep watch over
elevated storage.
Plan sensor access, mounting and cable routing around the tank. Measure at a representative point that stays submerged as water levels change.
Representative water-storage setting. Image color adjusted.PLAN THE MONITORING POINTSimple installation.
Simple installation.
Thoughtful placement.
Start with a storage tank, reservoir or clearwell where an immersed sensor can be safely installed and retrieved. Keep the sensing area clear of sediment and obstructions, and submerged as the water level changes.
Choose a point that represents the water you need to monitor. Use tank mixing, turnover and operating practices to decide whether one location is sufficient.
Explore mounting optionsQUESTIONS FROM THE FIELD
Direct answers about direct immersion.
Does an immersion chlorine sensor need a sample pump?
The Halogen immersion configuration does not need an external pump to deliver a sample to the sensor. Its integrated impeller moves the surrounding water across the sensing surface. The sensor and connected controller still require the appropriate power supply.
Can the sensor work in a tank with little water movement?
The impeller creates local sample velocity at the sensing surface, so measurement does not depend on tank flow providing that velocity. Select a representative location: the impeller does not mix the entire tank or eliminate stratification.
Can I measure both free and total chlorine by immersion?
Yes. The immersion configuration is available for MP5 Free and MP-Total. Choose MP5 Free for free chlorine monitoring, or MP-Total for total chlorine and monochloramine monitoring. Use the current model-specific data sheet to confirm the measurements, ranges and water conditions for your application.
Is the immersion sensor rated IP68?
The sealed immersion sensor assembly is rated IP68. Confirm the permitted depth, immersion duration, cable termination and mounting configuration with Halogen for your installation. The IP68 rating does not automatically apply to the controller or other above-water equipment.
Does direct immersion waste water or need a return line?
Direct immersion measures water where it is stored. It does not continuously remove a sample, so there is no analyzer sample stream to drain and no external sample-return line.
Does in-tank monitoring eliminate sampling delay?
It eliminates transport time through an external sample line. The sensor still has its own response time, and the tank’s mixing and turnover affect how quickly a change reaches the monitoring point.
How should the sensor be positioned and maintained?
Keep the sensing area submerged at the lowest operating water level, clear of sediment and obstructions, and accessible for inspection, calibration and service. Select an approved support or mounting arrangement. SensiCLENE self-cleaning helps control fouling; it does not eliminate maintenance.
Which water-quality measurements does MP5 Free provide?
MP5 Free measures free chlorine, pH, ORP, conductivity and temperature in one probe. This consolidates the monitoring point without assembling five separate probes. TDS and salinity calculated by a telemetry system are derived values, not additional directly measured parameters.
Can MP5 Free connect to our existing telemetry system?
Yes. MP5 Free supports Modbus RTU over RS-485 for connection to a compatible third-party telemetry unit or controller. The sensor is not itself a cellular gateway. Review the register map, serial settings, diagnostic registers, power supply and measurement timing with your integrator. A polling interval is not a guarantee of a new stabilized chlorine measurement at that interval.
Can MP5 Free monitor water below 300 µS/cm conductivity?
The published MP5 Free conductivity measurement range is 50–15,000 µS/cm. Water below 300 µS/cm may be within that range; confirm the actual minimum and all chlorine-measurement conditions for the selected configuration. Request a model-specific review for water outside the published limits.
What should I specify for a rooftop potable-water tank?
Specify the sensor and complete wetted immersion assembly, NSF/ANSI 61 documentation, mounting, cable routing, power and telemetry connection. Confirm actual water temperature and above-water equipment conditions against the selected model’s limits. Include access for calibration and service, and have the relevant authority review project acceptance.
Can we calibrate the sensor on site instead of exchanging heads?
On-site calibration is supported using the model-specific procedure and a suitable reference measurement. Agree the verification schedule, reference method and spare-parts plan during commissioning. A routine exchange of pre-calibrated heads does not need to be the default service model.
Build the simpler monitoring point.
Bring your tank layout, parameter list and telemetry requirements. We’ll help you select the immersion sensor, define the installation and compare the complete system cost.
Design your tank monitoring system