MP-HOT Hot Water Chlorine Analyzer
Free chlorine, pH, ORP, conductivity, and temperature in building hot water. Sample temperature 0–60°C. 60-second measurement cycle. No total chlorine.
NSF/ANSI/CAN 61-2024
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.
ORP Included
ORP is included: −200 to 1100 mV, ±1 mV resolution. Total chlorine is not measured.
Free chlorine, pH, ORP, conductivity, temperature
Measures free chlorine, pH, ORP, 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)
SensiCLENE self-cleaning. Calibration check every 6 months.
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 ppm |
| Total Chlorine | Not measured |
| Limit of Detection | 0.03 ppm |
| Resolution | 0.001 |
| Accuracy | ±5% or 0.04 ppm, whichever is greater |
| Chlorine pH Range | 6.5–9.0 |
| Interferences | Monochloramine (<5%), chlorine dioxide, ozone |
| Cycle Time | 60 seconds |
| Response Time (T90) | 90 seconds |
| Sample Temperature | 0–60°C |
| Ambient Temperature | −10 to 55°C |
| Storage Temperature | −20 to 40°C |
| pH Range | 5–12 |
| pH Accuracy | ±0.1 |
| pH Resolution | 0.01 |
| pH Electrode | DryGlas (can be stored dry) |
| ORP Range | −200 to 1100 mV |
| ORP Resolution | ±1 mV |
| Conductivity Range | 50–10,000 µS |
| Conductivity Accuracy | ±5% from 100 to 10,000 µS |
| Pressure | 145 psi (10 bar) |
| Flow | 0–4 m/s, zero flow OK |
| Ingress Protection | IP67 |
| Weight | 1 kg |
| Input Power | 12–24 VDC, 100 mA |
| Communications | Modbus RTU |
| Cable | 5/10/25 ft with M12 connector |
| Mounts | Slip adapter (CPVC, 2" tee); 2" MIP threaded adapter (SS316, tee insertion); flow cell FC-02 (3/8 NPT, 1/4" tubing); 2" corp stop wet-tap remover RMR-WT; immersion to 30 ft |
| Self-Cleaning | SensiCLENE |
| Calibration Check Interval | 6 months |
| Certifications | NSF/ANSI/CAN 61-2024, FCC, CE |
| Master Specification | Halogen Master Specifications v19 |
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 (0–10 ppm; accuracy ±5% or 0.04 ppm, whichever is greater), pH (5–12), ORP (−200 to 1100 mV), conductivity (50–10,000 µS), and temperature. It does not measure total chlorine.
Is the MP-HOT NSF-61 certified for direct in-pipe installation?
Yes. The MP-HOT is certified to NSF/ANSI/CAN 61-2024, and it is also FCC and CE marked. It installs with a CPVC slip adapter for a 2" tee, a 2" SS316 MIP threaded adapter, flow cell FC-02, the RMR-WT 2" corp-stop wet-tap remover, or immersion to 30 ft.
What is the sample temperature range?
Sample temperature is 0–60°C. Ambient temperature is −10 to 55°C. Storage temperature is −20 to 40°C.
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 calibration check interval is 6 months. SensiCLENE self-cleaning keeps the electrodes clean between checks.
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.