MP-5F (formerly MP5-A). Lineage: MP5, then MP5-A, then MP-5F.
NSF-61
Quick Answer
What is the MP-5F free chlorine sensor?
Monochloramine does not interfere with the free chlorine reading, so free chlorine stays free chlorine in blended or chloraminated water.
scienceAdvanced amperometric design eliminates the need for consumable chemicals or fragile membranes.
auto_modeIntegrated cleaning bead system maintains electrode cleanliness for high-precision readings in harsh environments.
speedMeasurement accuracy remains stable across varying hydraulic conditions without pressure regulators.
Certified for use in drinking water applications, meeting stringent safety and toxicity standards.
dashboardFull suite: Chlorine, pH, Temperature, Conductivity, and ORP in one probe.
updateEngineered for long-term stability, requiring user calibration only twice per year.
| Free Chlorine Range | 0–10 ppm |
| Limit of Detection | 30 ppb (0.03 ppm) |
| Limit of Quantitation | 40 ppb (0.04 ppm) |
| Resolution | 0.001 mg/L |
| Accuracy | ±5% of reference-calibrated value or 0.06 ppm, whichever is greater |
| Calibration Stability | 6 months typical |
| 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 (about 0–13 ft/s), flow independent |
| 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) |
Mounting configurations
Review the MP-5F configurations below. Select the mount around line access, pressure, serviceability, and whether the water is in a pipe or an open tank.
MKITA compact, wall-mounted side-stream assembly for treatment plants and retrofit projects.
D-H2MF-PThe sensor installs directly into a 2-inch PVC tee for inline measurement.
D-H2WT-PA stainless-steel sensor deployed through a 2-inch corporation stop while the line remains in service.
D-H2LF-PDrop the sensor directly into a clearwell, tank, basin, or open channel for zero-flow monitoring.
Request a quote or a deployment review and include line size, pressure, water chemistry, shutdown constraints, and whether the point is a tank or clearwell.
The MP-5F 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.
Yes. It is the same Halogen free-chlorine sensor platform in its current generation. The original MP5 was specified at ±15% accuracy; the MP5-A improved that to ±5%; the MP-5F keeps ±5% and has no monochloramine interference for free chlorine. Manuals and field results for installed MP5 and MP5-A sensors still apply to those sensors.
No. The MP-5F has no monochloramine interference, so its free chlorine reading stays free chlorine even where monochloramine is present, such as blend zones and systems moving between free chlorine and chloramines.
The MP-5F 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.
Cleaning beads are a routine consumable. The A-kit also includes the impeller and pH components, which can last substantially longer than a year. Inspect and replace components according to their condition and the model manual; extreme water conditions can shorten pH electrode life. Budget separately for labor, reference checks, batteries and connectivity. Ask your representative for a site-specific quote.
The MP-5F 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.
Yes. The MP-5F 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.
The MP-5F 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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Get the Halogen MP-5F drinking-water brochure for an overview of free-chlorine monitoring, direct-pipe installation, self-cleaning sensing, and the MP-5F platform.
Complete the form for immediate access to the PDF.
Speak with a water utility specialist to discuss your specific installation requirements.
Bring your water chemistry, installation requirements and questions about the right configuration.
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