Less routine sensor work
Reagent-free measurement and SensiCLENE automatic cleaning reduce reagent handling and routine electrode cleaning. Plan verification and wear-part service for the actual water conditions.
HOT WATER · COOLING WATER · OEM SYSTEMSMeasure chlorine.
Measure chlorine.
Keep the water.
Better treatment insight. Less water and heat down the drain.
Direct chlorine measurement for the people treating building water and the people paying to operate it. Monitor hot-water loops in the pipe, bring measurements into your controller, and see what is happening across the building.
Download sensor datasheets ↓
FOR WATER TREATERS & SKID BUILDERS
Make your service more valuable with every measurement.
Give customers a clearer record of treatment performance between service visits. Build a monitoring offer around dependable measurements, less routine upkeep and useful reporting.
Accuracy you can specify
MP-HOT’s published chlorine accuracy is ±5% of reading or 0.04 mg/L, whichever is greater. Direct residual measurements give your team a quantitative basis for reviewing treatment and investigating changes.
Evidence your customers can use
Bring trends, excursions and before-and-after service records into your reporting system. Show where residual is being lost, document the response, and make the value of your service visible.
A stronger service offering
Combine equipment, commissioning, remote trend review and scheduled maintenance into an ongoing monitoring service. Floor-by-floor visibility and measured operating-cost reductions give you more to discuss than the last grab sample.
Discuss a treatment or OEM projectFOR BUILDING OWNERS & FACILITY TEAMS
You paid to heat that water. Keep it in the loop.
A once-through sample-cooler installation can send two water streams to drain: the hot sample and the cold water used to cool it. Direct in-pipe MP-HOT monitoring removes both measurement-related waste streams.
Two streams. Several operating costs.
Hot loop → Sample cooler → Sensor → Drain
Cold supply → Sample cooler → Drain
Cold supply → Sample cooler → Drain
- Hot sample water and associated sewer charges
- Energy to heat replacement water
- Cold cooling water and associated sewer charges
- Any incremental pumping attributable to the sample system
Costs depend on sample flow, cooler design, operating hours and local utility rates.
Measure where the water circulates.
Hot loop → In-pipe sensor → Building return ↻
- No continuous hot sample sent to drain
- No sample cooler or cooling-water stream
- No replacement heating for discarded sample water
- Existing building-loop circulation continues normally
The sensor still uses electrical power and needs planned service. Normal building heating and circulation costs remain.
HOT-WATER SAMPLING COST ESTIMATORMethod: gallons = flow × 60 × annual hours. Heating fuel in therms = hot sample gallons × 8.34 BTU/(gallon·°F) × temperature rise ÷ 100,000 ÷ heater efficiency. Cooling water incurs water/sewer costs only in this model. Assumes once-through discharge, no heat recovery and a fuel-fired heater. Set cooling flow to zero for a system without once-through cooling water. This is not a total cost of ownership or guaranteed savings estimate: sensor power, purchase, installation, verification, maintenance and any incremental sample-pumping energy are excluded. Normal loop pumping and heating remain. For heat pumps or electric heaters, request a site-specific calculation.
What is your sample stream costing?
Illustrative inputs, not measured site data. Adjust the values to estimate annual water and replacement-heating costs avoided by removing a once-through hot sample and its cooling-water stream.
157,680gallons/year to drain avoided
$1,577water + sewer/year
$584replacement heating/year
$2,161combined avoidable utility cost/year per monitoring point
DIRECT MEASUREMENT MATTERS
Chlorine is measured directly. Never derived from ORP.
Halogen uses amperometric chlorine measurement. ORP is a separate measurement that adds context; it is not the source of the chlorine reading.
Chlorine answers “how much?”
A chlorine reading reports residual concentration in mg/L (ppm). It lets a water treater compare the residual against the site’s treatment targets, track losses through the building and verify the effect of an adjustment.
ORP answers a different question
ORP reports an electrochemical potential in millivolts. It responds to the combined oxidizing and reducing conditions, including pH, temperature and other species. There is no universal conversion from an ORP value to chlorine concentration.
Do not mistake a stable ORP reading for a verified chlorine residual.
Changes in water chemistry can alter ORP without a matching change in chlorine concentration. Direct chlorine measurement separates the residual question from that broader signal, helping teams investigate low residual and make informed dosing decisions. Use pH, temperature and ORP alongside chlorine to understand the conditions.
MATCH THE SENSOR TO THE LOOP
High-temperature monitoring for hot water. Direct residual insight for cooling water.
MP-HOT: building hot-water loops
Measure directly in compatible hot-water circulation and return piping, without cooling the sample first. Published operating temperature: 1–60°C (up to 140°F). Check the complete temperature profile, including thermal disinfection cycles, when selecting the installation.
MP-HOT datasheet (PDF)MP5: compatible cooling-water applications
Track free chlorine alongside the other water-quality signals to support treatment review. Confirm oxidant chemistry, temperature, fouling conditions and mounting with your water treater. Monitoring-related water savings do not eliminate required cooling-tower blowdown.
MP5 datasheet (PDF)
FROM THE PLANT ROOM TO EACH FLOOR
One return reading cannot describe the whole building.
Plan sensors at building entry, the main return and appropriate floor or end-of-line return points. Compare local trends to see where residual or temperature is changing, then route that information to the people responsible for the response.
ILLUSTRATIVE MONITORING PLAN
1Upper floor · end-of-line returnSensor → controller → reporting
2Middle floor · end-of-line returnSensor → controller → reporting
3Lower floor · end-of-line returnSensor → controller → reporting
4Plant room · hot-water returnSensor → controller → reporting
5Building entry · incoming-water baselineSensor → controller → reporting
Five signals. Earlier investigation.
Chlorine, pH, temperature, conductivity and ORP help the team recognize changing water conditions. Configure site-specific alarms in the receiving system, assign a response owner and retain trends for customer reports.
Falling residual or temperatures outside the water management program’s limits can prompt investigation of conditions associated with Legionella growth. These measurements do not detect Legionella or predict an outbreak; microbiological testing and the building’s water management program remain essential.
Confirm the five-channel configuration for the selected sensor. Place each probe in representative water with suitable access for service and verification.
CDC guidance on monitoring building water ↗Chlorine
Track the measured disinfectant residual and identify loss between building entry and remote returns.
pH
Understand changes that affect chlorine chemistry and treatment performance.
Temperature
See whether monitored hot-water locations remain within your water management program’s limits.
Conductivity
Identify changes in dissolved-ion content that may warrant investigation.
ORP
Add oxidation-reduction context alongside the independently measured chlorine residual.
HOSPITAL WATER · FLOOR-BY-FLOOR VISIBILITYFind the floor.
Find the floor.
Focus the response.
A distributed network—or “swarm”—of sensors helps your team see local changes that a single plant-room reading can miss. Compare hot-water returns and cold-water branches to narrow the investigation to a floor or monitored zone.
View the architectural reference diagram
Smaller problems become visible
A loss of residual on one return can point to a local condition. Similar changes across several floors can suggest a shared upstream issue. Sensor placement and the actual pipe network determine how closely you can locate it.
Five measurements add context
Measure chlorine directly, with pH, temperature, conductivity and ORP as complementary signals. Check sensor status and reference measurements, then investigate circulation, water age or changed water chemistry. Readings alone do not establish the cause.
Support the patient-protection plan
Route excursions to the facility’s water management team, follow the agreed response and document recovery. These sensors identify water-quality changes; they do not detect Legionella, confirm biofilm or establish that every outlet is safe.
FROM MEASUREMENT POINT TO CUSTOMER REPORT
Plan the mounting. Connect the network.
A PVC tee (PVCT) provides direct inline mounting where the complete assembly is compatible and the pipe can be isolated for service. Select a temperature- and pressure-rated assembly for each location; do not assume a PVC tee is suitable for hot water.
For compatible hot-water points, review MP-HOT’s 1–60°C operating range against normal operation and disinfection cycles. Connect sensors through Smart Boxes via Modbus RTU to a compatible controller, then configure location names, trends and alarm routing in the receiving system.
More points. Fewer blind spots.
Add representative floor returns, remote branches and building-entry measurements according to the water management plan. More sensors improve spatial coverage; they do not automatically monitor every fixture.
Request sensor specifications ↗CDC: monitoring building water ↗YOUR SKID. YOUR CONTROLLER. YOUR CUSTOMER.
Integrate through a Smart Box via Modbus RTU.
For OEM applications, connect the sensor through a Smart Box to a compatible third-party controller using Modbus RTU. Build Halogen measurement into your own treatment skid, operator interface and customer reporting workflow.
Halogen sensor → Smart Box → Modbus RTU → Third-party controller / OEM PLC → Your alarms & reports
Keep your control platform
Use the compatible OEM or third-party controller to display measurements and implement your own treatment logic.
Commission the complete connection
Confirm Smart Box configuration, power, wiring, register mapping, units and communication settings with Halogen.
Make data actionable
Configure polling, sensor status, communication-loss handling and alarm routing. Connect the controller to your customer reporting system.
TECHNICAL RESOURCES
Put the specifications in your project file.
MP-HOT + MP5 DATASHEETS
Get the specifications for your project.
Complete one form for instant access to both sensor datasheets.
- MP-HOT: hot-water temperature limits, measurement specifications and installation information.
- MP5: specifications for compatible incoming and cooling-water applications.
LEGIONELLA WATER MANAGEMENT
Build monitoring into a complete water management program.
TECHNICAL FOUNDATION
Hot & cold water monitoring ↗
Plan hot- and cold-water residual monitoring to support your Legionella water management program. Guidance for building owners and water treatment providers.
BUILDING OWNERSVisibility, responsibilities & costs ↗
See how continuous water-quality monitoring supports building water management, operating-cost decisions and coordination with your water treater.
WATER TREATERSIntegration, reporting & service ↗
Plan residual monitoring, OEM integration and service reporting for building water management. Explore sensor selection and a practical customer pilot.
PLAN YOUR BUILDING OR OEM APPLICATIONStart with the loop.
Discuss your commercial projectStart with the loop.
Build the right measurement plan.
Share your water chemistry, operating temperatures, controller model and proposed monitoring points. For a cost review, include sample and cooling-water flows and utility rates.