Continuous Cooling Tower Monitoring — No Reagents, No Waste Stream
Halogen MP-series sensors install directly in cooling tower loops to monitor chlorine (or monochloramine), pH, conductivity, and temperature 24/7. Built for ASHRAE 188 compliance and the chemistry control needs of commercial and industrial cooling systems.
MP-HOT — hot water & cooling loop sensor
Cooling towers fail what you can't see in real time
The hardest cooling-tower problems happen between grab samples — biocide depletion overnight, dilution after a heavy blowdown, conductivity drift after a make-up water change, scale and biofilm building on coupons no one checks until next week. The Halogen platform turns those blind spots into a continuous data feed.
Legionella Risk
Warm, aerosolized water in cooling towers is the leading source of Legionnaires' outbreaks in commercial buildings. Continuous disinfectant residual monitoring is the only way to prove the loop stays in spec 24/7.
Biocide Verification
Manual grab samples miss residual swings caused by dilution, blowdown cycles, drift, and biocide consumption. By the time a lab confirms a failure, the exposure window is already over.
Chemistry Cost
Over- and under-dosing biocides and pH adjusters is the largest controllable cost in cooling tower operation. Continuous data lets operators dose precisely instead of defensively.
A single in-loop sensor built for cooling water chemistry
Halogen MP-series sensors are the only NSF-61 certified, reagent-free chlorine analyzers designed to survive in cooling tower loops without bypass panels or floor drains. Drop one in each tower, wire it to the D20 controller, and feed continuous data to your BMS or SCADA system.
NSF-61 Certified
Direct in-loop installation — no waste stream, no floor drain, no bypass panel required.
Self-Cleaning (SensiCLENE)
Polymer-bead cleaning prevents scale and biofilm fouling in the high-mineral, high-temperature environments cooling towers create.
4 Parameters in One Probe
Free chlorine (or monochloramine), pH, conductivity, and temperature — all on a single insertion point.
24/7 Compliance Data
Continuous logs replace weekly grab samples and document ASHRAE 188 / CDC water management plan compliance.
Cellular & SCADA Ready
BACnet, Modbus RTU, and 4-20mA outputs plus cellular IoT for sites without network drops.
Saves Water & Energy
Eliminates the 70,000+ gallon/year sample stream that reagent analyzers require. Less makeup water, less heated waste.
Deployments
Commercial HVAC
Office towers, mixed-use buildings, and campuses subject to ASHRAE 188 water management plans.
Hospitals & Healthcare
Acute-care facilities where Joint Commission and CMS require documented Legionella controls on every condenser loop.
Industrial Process Cooling
Data centers, food & beverage, pharmaceutical, and manufacturing cooling loops where uptime and product safety depend on chemistry control.
policyBuilt for ASHRAE 188 & CDC Water Management Plans
ASHRAE Standard 188 and the CDC Toolkit require building owners to maintain documented water management plans for cooling towers, with validated control limits and corrective-action records. Continuous chlorine, pH, and temperature data from a Halogen sensor on each loop produces the evidence auditors look for — without the manual sampling burden.
Frequently Asked Questions
Can a Halogen sensor really live in a cooling tower loop?
Yes. The MP-HOT and MP5 sensors are designed for continuous immersion in conditioned cooling tower water up to 60°C (140°F). The SensiCLENE system handles the scale and biofilm formation that fouls conventional electrodes.
Do I need a separate sensor for free chlorine vs monochloramine?
No. Halogen MP-series sensors are field-selectable for free chlorine or monochloramine, so the same hardware works whether your biocide chemistry is hypochlorite, electrochemically generated chlorine, or stabilized chloramine.
How does this satisfy ASHRAE 188 / CDC requirements?
ASHRAE 188 and the CDC Toolkit require building owners to maintain documented water management plans for cooling towers, with validated control limits and corrective-action records. Continuous chlorine, pH, and temperature data from a Halogen sensor on each loop produces the evidence auditors look for — without the manual sampling burden.
What about make-up water monitoring?
The same sensor and controller can monitor make-up water quality before it enters the tower, helping operators understand whether incoming chemistry is contributing to control problems.
Tell us about your cooling loop
Share your tower configuration, biocide chemistry, and number of monitoring points — we'll recommend the right sensor & controller combination and pricing.
- check_circleFree site assessment
- check_circleFree chlorine or monochloramine — same sensor
- check_circleBACnet, Modbus & cellular options
- check_circleCompliant with ASHRAE 188 / CDC plans