MP5 Free Chlorine Sensor
Precision real-time monitoring of free chlorine and four essential water parameters in a single, self-cleaning industrial sensor package.
NSF-61
Quick Answer
What is the MP5 free chlorine sensor?
Key Features
No Reagents or Membranes
Advanced amperometric design eliminates the need for consumable chemicals or fragile membranes.
Self-Cleaning (SensiCLENE)
Integrated cleaning bead system maintains electrode cleanliness for high-precision readings in harsh environments.
Flow & Pressure Independent
Measurement accuracy remains stable across varying hydraulic conditions without pressure regulators.
NSF-61 Certified
Certified for use in drinking water applications, meeting stringent safety and toxicity standards.
5 Parameters
Full suite: Chlorine, pH, Temperature, Conductivity, and ORP in one probe.
6-Month Calibration
Engineered for long-term stability, requiring user calibration only twice per year.
Technical Specifications
| 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 | 0–45°C |
| Operating Temperature | 1–45°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) |
Installation Options
Wet-Tap (In-Pipe)
PVC Tee (Side-Stream)
Immersion (Tank/Clearwell)
Flow Cell
Frequently Asked Questions
What is the MP5 free chlorine sensor?
The MP5 is an NSF-61 certified, reagent-free amperometric sensor that simultaneously measures Free Chlorine, pH, Conductivity, Temperature, and ORP in a single probe. It installs directly into water lines with no sample panel, no waste stream, and no membranes.
How does the MP5 work in zero-flow conditions?
The MP5 is flow-independent. Its built-in impeller creates internal circulation across the sensor, so it measures accurately in stagnant water, dead ends, storage tanks, and clearwells where conventional sensors fail.
What are the annual parts costs?
The H1 annual maintenance kit costs $553.61. H2 requires only annual cleaning-bead replacement; the full H2 maintenance kit is not an annual requirement. Current comparison benchmarks are $2,328 for online DPD, $1,794 for membrane amperometric, and $1,441 for bare electrode.
How long between calibrations with the MP5?
The MP5 typically holds factory calibration for six months or more in drinking water applications. The SensiCLENE self-cleaning system prevents electrode fouling that causes drift in other sensors.
Can the MP5 install directly in a water main?
Yes. The MP5 is NSF-61 certified for direct in-pipe (wet-tap) installation. It can also mount in a PVC tee, immerse in a tank or clearwell, or install in a side-stream flow cell.
What certifications does the MP5 hold?
The MP5 is NSF/ANSI 61 certified for drinking water contact, EPA Method 334.0 compliant for regulatory reporting, and BABA (Build America, Buy America) compliant.
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