MP-HOT Hot Water Chlorine Analyzer
Continuous residual, pH, conductivity, and temperature monitoring in building hot water loops — all in-pipe with no waste stream.
NSF-61
ASHRAE 188 requires a water management program with documented control limits; it does not name an analyzer. In-pipe residual and temperature records can support those limits and replace weekly grab samples.
Key Benefits
Direct In-Pipe (NSF-61)
Install directly into hot water return loops. No bypass panels, no sample lines, no floor drains required.
No Waste Stream
Eliminates 70,000 gallons of wasted water per year. Saves $490 in water costs and $950 in energy costs annually.
Monochloramine Option
Available with monochloramine measurement for facilities using chloramine-based disinfection systems.
Residual, pH, conductivity, temperature
Measures residual, pH, conductivity, and temperature in a single probe. ASHRAE 188 does not require continuous online residual, pH, ORP, or conductivity.
Continuous in-pipe records
Continuous data replaces weekly grab samples. Captures transient events that manual testing misses 99.9% of the time.
Self-Cleaning (SensiCLENE)
Polymer bead cleaning system prevents scaling in hot water environments. 6-12 months maintenance-free operation.
Where MP-HOT is Deployed
Protecting building occupants from Legionella in the facilities that need it most.
Hospitals & Healthcare Facilities
Protect immunocompromised patients with continuous Legionella monitoring. Meet Joint Commission and CMS requirements.
Hotels & Hospitality
Automated compliance monitoring across large plumbing systems. Reduce liability and protect guests from waterborne pathogens.
Commercial Office Buildings
Supports an ASHRAE 188 water management program's documented control limits. Continuous in-pipe records without dedicated sampling staff.
Trusted by Industry Leaders
Leading building water management companies rely on Halogen MP-HOT sensors for continuous Legionella compliance monitoring.
HC Info
HC Info provides building water management consulting and their LAMPS platform integrates Halogen MP-HOT sensor data into BMS and compliance monitoring systems for continuous Legionella prevention.
Phigenics — Independent Water Management
The independent leader in building water management, providing Legionella risk assessment, ASHRAE 188 compliance programs, and their patented TimeZero® validation testing — paired with Halogen MP-HOT sensors for continuous monitoring.
Technical Specifications
| Specification | Value |
|---|---|
| Free Chlorine Range | 0–10 mg/L (ppm) |
| Limit of Detection | 0.03 mg/L (30 ppb) |
| Resolution | 0.001 mg/L |
| Accuracy | ±5% of reading or 0.04 mg/L (0.04 ppm), whichever is greater |
| Response Time (T90) | 90 seconds |
| Chlorine Measurement pH Range | 6.5–9.0 pH |
| Standalone pH Measurement Range | 2–12 pH |
| Conductivity Range | 50–15,000 µS/cm |
| Sample Temperature | 0–60°C |
| Operating Temperature | 1–60°C |
| Ambient Temperature | −10–55°C |
| Pressure Range | −0.7–10 bar (vacuum to 145 psi) |
| Operating Flow | 0–4 m/s |
| Storage Temperature | −20–40°C |
| Input Power | 12–24 VDC, 100 mA |
| Communications | Modbus RTU |
| Master Specification | Halogen Master Specifications v19 |
| Ingress Protection | IP65 |
| Weight | 1 kg (2.2 lb) |
Download the MP-HOT Data Sheet
Get full technical specs, wiring diagrams, compliance documentation, and dimensional drawings.
Frequently Asked Questions
What parameters does the MP-HOT measure?
The MP-HOT measures Free Chlorine, pH, Conductivity, and Temperature in a single in-pipe probe.
Is the MP-HOT NSF-61 certified for direct in-pipe installation?
Yes. The MP-HOT is NSF/ANSI 61 certified for direct installation into building hot water pipes. No bypass panel, no sample lines, and no floor drain required.
What is the maximum operating temperature?
The MP-HOT operates in water up to 60°C (140°F), making it suitable for hot water return loops where Legionella typically grows.
Does the MP-HOT meet ASHRAE Standard 188 requirements?
No. ASHRAE 188 is satisfied by a documented water management program, not by a named analyzer. The MP-HOT can record residual and temperature against the WMP's control limits. That does not, by itself, satisfy 188.
How often does the MP-HOT need maintenance?
The SensiCLENE self-cleaning system keeps electrodes clean automatically. Operators perform a simple wear parts swap once per year, which takes under five minutes and does not require recalibration.
Does the MP-HOT produce a waste stream?
No. Direct in-pipe installation eliminates sample lines and waste streams, saving approximately 70,000 gallons of water per year and $1,440 in combined water and energy costs annually.
Protect your building. Meet compliance requirements.
Schedule a site assessment with our Legionella monitoring specialists.